JPH06331234A - Refrigerator - Google Patents

Abstract

PURPOSE:To make easy and quick a treatment to be required for the use of a new refrigerant replacing an old refrigerant at the place where a refrigerator is installed when the refrigerant in a refrigerant pipe-line leaks. CONSTITUTION:A refrigerant-charging port 21 is formed on an accumulator 5 and its volume is made as large as the whole amount of a refrigerant to be charged can be held therein. Oil-removing pipes 22, 23 are respectively formed at the parts where oil in the accumulator 5 and a compressor 1 is to be received, and a space 25 for installing a dryer 24 is provided at the midway part of a pipe line 26 for the refrigerant in a liquid state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating device such as an air conditioner, a refrigerator, a chiller or the like.

[0002]

2. Description of the Related Art An example of a conventional refrigerant circuit of an air conditioner is shown in FIG. The gas refrigerant discharged from the hermetic compressor 1 is condensed and liquefied by the condenser 2, adiabatically expanded by the throttle 3, and then evaporated and vaporized by the evaporator 4. Then, it is sucked into the compressor 1 through the accumulator 5 and compressed again.

Inside the casing 1a of the hermetic compressor 1, a compression mechanism 1b such as a scroll compression mechanism and an electric motor 1c for driving the same are built in, and an oil sump 1d is provided at the bottom of the casing 1a.
Are formed.

The accumulator 5 comprises a container 5a, a U-shaped pipe 5b and a suction pipe 5c. An oil return hole 5d is formed in the lower part of the U-shaped pipe 5b and a balance hole 5e is formed in the upper part.

The gas refrigerant evaporated and vaporized in the evaporator 4 enters the container 5a through the suction pipe 5c of the accumulator 5, and the liquid refrigerant and refrigerating machine oil contained in the gas refrigerant are separated therein.
Then, only the gas refrigerant passes through the U-shaped pipe 5b and is sucked into the casing 1a of the compressor 1. Refrigerating machine oil and liquid refrigerant 5f separated from the gas refrigerant are stored in the bottom of the container 5a, and the oil return hole
The small amount of gas enters the U-shaped pipe 5b from 5d and returns to the compressor 1 along with the gas refrigerant flowing therethrough.

[0006]

The refrigerant circuit of this kind of air conditioner is usually filled with CFCs composed of R22 as a refrigerant, but these CFCs destroy the ozone layer, and their production in the near future. And it is predicted that the use will be banned.
Then, R134a, R32, R142 and the like have been proposed as alternative refrigerants, and great efforts have been made to put them into practical use.

However, a large number of refrigerating devices filled with the refrigerant R22 have already been manufactured and widely used in various places, and the durability of these refrigerating devices is as long as 30 years. Further, the refrigeration function cannot be sufficiently exerted only by filling the alternative refrigerant in place of the refrigerant R22.

Therefore, if the refrigerant R22 leaks from these refrigeration systems or the refrigerant R22 is purged to repair the refrigeration systems after the production of the refrigerant R22 is prohibited in the near future,
After that, these refrigerating devices become unusable.

In order to deal with this, the refrigerating device in which the refrigerant R22 leaks or the defective refrigerating device is removed from the installation site and transported to a repair shop, where the refrigerating device is repaired or repaired to correspond to the alternative refrigerant. It is conceivable to fill the inside of the refrigerant circuit with the alternative refrigerant and carry it to the installation site for installation after the application, but this has a problem that it takes a lot of time and money.

[0010]

The present invention has been invented to solve the above-mentioned problems, and the gist thereof is to provide a compressor, a condenser, a throttle, an evaporator and an accumulator with a refrigerant pipe. In the connected refrigeration system, the accumulator is provided with a refrigerant charge port, and the volume thereof is not large enough to accommodate the entire amount of refrigerant charge, and an oil drain pipe is provided at least in the accumulator and the oil reservoir of the compressor. A refrigerating apparatus is characterized in that a dryer installation space is provided in the liquid line of the refrigerant pipe.

[0011]

In the present invention, since it has the above-mentioned configuration, at the installation site of the refrigeration system, the refrigerant R22 is withdrawn from the refrigerant circuit, a dryer is installed in the liquid line of the refrigerant pipe, and the existing oil removal pipe is used. Refrigerating machine oil is extracted, new refrigerating machine oil corresponding to the alternative refrigerant is injected, and the alternative refrigerant is sealed in the accumulator from the refrigerant charge port.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIG. The accumulator 5 is provided with a refrigerant charge port 21, and its volume is large enough to accommodate the entire refrigerant charge amount. An oil drain pipe 22 is provided at the bottom of the accumulator 5, which serves as an oil reservoir.

The compressor 1 is provided with an oil drain pipe 23 at a portion that serves as an oil reservoir, that is, at the bottom of the closed container 1a.
Further, an installation space 25 for the dryer 24 is provided in the liquid line of the refrigerant pipe, that is, in the refrigerant pipe 26 connecting the condenser 2 and the throttle 3. Other configurations are similar to those of the conventional one shown in FIG. 2, and corresponding members are designated by the same reference numerals.

Since the alternative refrigerant is a non-azeotropic mixed refrigerant,
If this is filled in a gaseous state, the mixing ratio will change, so it cannot be filled in a gaseous state like the refrigerant R22, and it has to be filled in the refrigerant circuit in a liquid state. Therefore, the closed container of the compressor 1 Although it is not possible to fill the inside of 1a, the accumulator 5 is provided with a refrigerant charge port 21, and the volume thereof is large enough to accommodate the entire refrigerant charge amount. Therefore, the alternative refrigerant is introduced from the refrigerant charge port 21 into the accumulator 20. By injecting, the alternative refrigerant of the total refrigerant charge amount can be enclosed in the refrigerant circuit all at once.

Further, the refrigerating machine oil used together with the refrigerant R22 cannot be used together with the refrigerating machine oil because it is not compatible with the alternative refrigerant. Since it collects in the oil sump of the machine 1, it can be easily extracted from the oil drain pipes 22 and 23. Then, the refrigerating machine oil corresponding to the alternative refrigerant can be easily injected into the closed container 1a of the compressor 1 using the oil drain pipe 23.

Further, unlike the refrigerant R22, the alternative refrigerant has a high water absorption, so that it is necessary to install a dryer in the liquid line, but since the installation space 25 is provided, the dryer 24 can be easily installed here. .

When a receiver, a dryer and the like are provided, it is desirable to attach an oil drain pipe to these as well. Further, the receiver may be provided with a refrigerant charge port so that the volume thereof is large enough to accommodate the entire refrigerant charge amount.

[0018]

As described above, in the present invention, it is possible to easily and quickly take the necessary measures to use the alternative refrigerant in place of the refrigerant R22 at the installation site of the refrigeration system.
Fill the refrigeration unit that was filled with R22 with an alternative refrigerant,
It can be used until its mechanical life is exhausted.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram showing an embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram of a conventional refrigeration system.

[Explanation of symbols]

 1 Compressor 2 Condenser 3 Throttle 4 Evaporator 5 Accumulator 21 Refrigerant charge port 22, 23 Oil drain pipe 26 Liquid line 24 Dryer 25 Installation space

Claims (1)

[Claims] 1. A refrigeration system in which a compressor, a condenser, a throttle, an evaporator, and an accumulator are connected by a refrigerant pipe, and the accumulator is provided with a refrigerant charge port, and its volume is large enough to accommodate the entire refrigerant charge amount. None, a refrigerating apparatus characterized in that an oil drain pipe is provided at least in a portion which becomes an oil sump of the accumulator and the compressor, and a dryer installation space is provided in a liquid line of the refrigerant pipe.