JPH08200899A - Non-azeotropic mixing refrigerant filling apparatus - Google Patents

Abstract

PURPOSE: To solve a problem of liquid compression in a compressor by providing a refrigerant evaporating means, which evaporates a non-azeotropic mixing refrigerant, when the non-azeotropic mixing refrigerant is to be filled in a refrigerant circuit through a bomb containing the non-azeotropic mixing refrigerant for supplement, in an apparatus for filling the non-azeotropic mixing refrigerant for supplement into the refrigerant circuit. CONSTITUTION: An air conditioner 1 comprises an outdoor unit 3 and an indoor unit 5, said outdoor unit 3 housing therein an accumulator 9, a compressor 11, a four-way valve 13, an outdoor heat exchanger 15, a three-way valve 21 and the like, said indoor unit 5 housing therein an indoor heat exchanger 23, an expansion valve 19, a fan 25 and the like. In this case, when a non-azeotropic mixing refrigerant leaks, a bomb 100 is connected to a port 21a of the three-way valve 21 so that a suction pressure in the compressor 11 permits the non- azeotropic mixing refrigerant contained in the bomb 100 to be charged into a refrigerant circuit through a shut-off valve 101. At this time, heating produced by energization of a heater 105 provided on an outer periphery of a charge hose 103 evaporates a refrigerant passing through the charge hose 103.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-azeotropic mixed refrigerant charging apparatus for charging a non-azeotropic mixed refrigerant for replenishment into a refrigerant circuit of a refrigeration system (for example, an air conditioner).

[0002]

2. Description of the Related Art Generally, when the refrigerant in the refrigerant circuit leaks, the refrigerant contained in a replenishing cylinder is charged into the refrigerant circuit.

When charging a single refrigerant, conventionally, the weight of the cylinder is weighed with a balance, and the weight of the refrigerant which is estimated to have leaked is charged from the suction line of the compressor. However, these days,
Alternative refrigerant (eg, R-407C) according to CFC regulations
Has become widespread, and the handling of replenishment of leaked alternative refrigerants has become a problem. That is, the alternative refrigerant R-
407C is HFC32 / 125 / 134a; 23/2
It is a non-azeotropic mixed refrigerant having a composition of 5/52 w%, and needless to say, since the boiling points are different, there is a problem that composition changes are likely to appear when the refrigerant is charged.

[0004]

In order to solve the problem of the composition change of the refrigerant, the refilling non-azeotropic mixed refrigerant is charged in a liquid state, but in a liquid state through the suction line of the compressor. When charging is performed, there is a problem that the compressor sucks the liquid refrigerant to cause liquid compression, which easily causes a failure of the compressor.

Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional techniques, and to charge the non-azeotropic mixed refrigerant in a liquid state while preventing the compressor from causing liquid compression. It is to provide an azeotropic mixed refrigerant charging device.

[0006]

According to the first aspect of the present invention,
In a non-azeotropic mixed refrigerant filling device for filling a replenishment non-azeotropic mixed refrigerant into the refrigerant circuit of the refrigeration system, a cylinder containing the replenishment non-azeotropic mixed refrigerant, and into the refrigerant circuit through this cylinder And a refrigerant vaporizing means for vaporizing the filled non-azeotropic mixed refrigerant.

According to a second aspect of the present invention, in a non-azeotropic mixed refrigerant charging device for charging a replenishing non-azeotropic mixed refrigerant into a refrigerant circuit of a refrigerating device, the replenishing non-azeotropic mixed refrigerant is accommodated. And a refrigerant vaporizing means for vaporizing the non-azeotropic mixed refrigerant filled in the refrigerant circuit through the cylinder.The refrigerant vaporizing means is provided around the tube through which the non-azeotropic mixed refrigerant for replenishment is passed. A high-temperature gas pipe is arranged in this, and a part of the gas discharged from the compressor is passed through this high-temperature gas pipe.

According to a third aspect of the present invention, in a non-azeotropic mixed refrigerant charging device for charging a replenishing non-azeotropic mixed refrigerant into a refrigerant circuit of a refrigeration system, the replenishing non-azeotropic mixed refrigerant is accommodated. And a heater for heating the refrigerant for vaporizing the non-azeotropic mixed refrigerant filled in the refrigerant circuit through the cylinder.

[0009]

According to the invention described in claims 1 to 3, when the amount of the refrigerant in the refrigerant circuit of the refrigerating device is insufficient, the non-azeotropic mixed refrigerant contained in the refilling cylinder is charged in the refrigerant circuit. To do. At the time of charging, the non-azeotropic mixed refrigerant is charged in a liquid state. However, since the non-azeotropic mixed refrigerant charged in the refrigerant circuit through the cylinder is vaporized by the refrigerant vaporizing means, the state of the non-azeotropic mixed refrigerant changes from the liquid phase to the vapor phase when sucked into the compressor. Therefore, the compressor does not cause liquid compression, which does not lead to failure of the compressor.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a refrigerant circuit of the air conditioner 1. The air conditioner 1 includes an outdoor unit 3 and an indoor unit 5, and the units 3 and 5 are connected by two refrigerant pipes 7. The outdoor unit 3 includes an accumulator 9, a compressor 11, a four-way valve 13, an outdoor heat exchanger 15, a fan 17, a three-way valve 21 and the like, and an indoor unit 5 includes an indoor heat exchanger 23, an expansion valve 19, The fan 25 and the like are built in. When the air conditioner 1 is operated, the refrigerant flows through the refrigerant circuit to cool or heat the room.

In this embodiment, however, HFC32 / 125 / 134a; 23/25/52 is used in the refrigerant circuit.
A non-azeotropic mixed refrigerant (R-407C) having a composition of w% is filled, and during operation of the air conditioner 1, the non-azeotropic mixed refrigerant may leak through a joint between pipes or the like. If the non-azeotropic mixed refrigerant leaks, the three-way valve 21
A cylinder 100 containing a replenishing refrigerant is connected to the port 21a, and the non-azeotropic mixed refrigerant in the cylinder 100 is charged into the refrigerant circuit by the suction pressure of the compressor 11 through the on-off valve 101.

The cylinder 100 is a cylindrical pressure vessel,
A siphon tube (not shown) extends inside so that it can be charged in a liquid state. This cylinder 100 has almost the same composition (HFC32 / 125 / 134a; 23 /) as the non-azeotropic mixed refrigerant (R-407C) filled in the refrigerant circuit.
A non-azeotropic mixed refrigerant having a weight ratio of 25/52 w%) is stored in a liquid state, and at the time of charging the refrigerant, the weight of the refrigerant which is estimated to have leaked while being measured by the balance 101 is charged.

Taking the air conditioner 1 as an example, the amount of refrigerant filled in the refrigerant circuit is approximately 1 kg per horsepower.

The cylinder 100 is connected to the port 21a of the three-way valve 21 via a charge hose 103 having a pressure resistance of about 20 kg / cm ² , and the non-azeotropic mixed refrigerant is charged through this charge hose 103.

According to this embodiment, however, the heater 105 for heating the refrigerant is arranged around the outer periphery of the charge hose 103 or the charge pipe (made of copper: not shown), and when an electric current is passed through the heater 105. , Charge hose 10
The refrigerant passing through 3 is vaporized.

When charging is started in the refrigerant circuit while the air conditioner 1 is being cooled, the non-azeotropic mixed refrigerant is charged in the liquid state from the cylinder 100, and the non-azeotropic mixed refrigerant in the liquid state is charged. It vaporizes while passing through the hose 103.

According to this, the non-azeotropic mixed refrigerant in the liquid state is not sucked into the compressor 11 as it is, but is sucked in the vaporized state, so that liquid compression does not occur and the compressor 11 Problems such as breakdowns (liquid compression) are prevented in advance.

FIG. 2 shows another embodiment. According to this, the high pressure gas pipe 107 for heating the refrigerant is arranged around the outer periphery of the charge hose 103, and a part of the discharge gas of the compressor 11 is introduced into the high pressure gas pipe 107. When a part of the discharge gas is introduced into the high pressure gas pipe 107, the refrigerant passing through the charge hose 103 is heated by the heat of the discharge gas and vaporized.

According to this, the non-azeotropic mixed refrigerant in the liquid state is not sucked into the compressor 11 as it is, but is sucked in the vaporized state, so that liquid compression does not occur and the compressor 11 Trouble such as breakdown is prevented in advance.

Although the present invention has been described above based on the embodiment, the present invention is not limited to this. Various modifications are possible.

For example, in the above embodiment, the refrigerant vaporizing means is provided in the charge hose 103, but the invention is not limited to this. For example, in the middle of the so-called suction line at points A to B in FIG. It may be provided.

[0022]

As described above, according to the invention described in claims 1 to 3, since the non-azeotropic mixed refrigerant charged in the refrigerant circuit through the cylinder is vaporized by the refrigerant vaporizing means, the compressor. When the non-azeotropic mixed refrigerant changes its state from the liquid phase to the gas phase when it is sucked into the suction line of (1), the compressor does not cause liquid compression and does not lead to failure of the compressor.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram showing an embodiment of a non-azeotropic mixed refrigerant charging device according to the present invention.

FIG. 2 is a refrigerant circuit diagram showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air conditioner 3 Outdoor unit 5 Indoor unit 11 Compressor 21 Three-way valve 100 Cylinder 103 Charge hose 105 Heater (refrigerant vaporization means) 107 High pressure gas pipe (refrigerant vaporization means)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoto Sakamoto 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. A non-azeotropic mixed refrigerant filling device for filling a replenishing non-azeotropic mixed refrigerant into a refrigerant circuit of a refrigeration system, and a cylinder containing the replenished non-azeotropic mixed refrigerant, and the cylinder. A non-azeotropic mixed refrigerant charging means for vaporizing the non-azeotropic mixed refrigerant filled in the refrigerant circuit through the non-azeotropic mixed refrigerant charging device. 2. A non-azeotropic mixed refrigerant charging device for charging a replenishing non-azeotropic mixed refrigerant into a refrigerant circuit of a refrigerating machine, and a cylinder containing the replenishing non-azeotropic mixed refrigerant, and the cylinder. And a refrigerant vaporizing means for vaporizing the non-azeotropic mixed refrigerant filled in the refrigerant circuit through the refrigerant vaporizing means, wherein the refrigerant vaporizing means is a high temperature gas pipe around a tube through which the non-azeotropic mixed refrigerant for supplementation is passed. The non-azeotropic mixed refrigerant charging device is characterized in that a part of the discharge gas of the compressor is passed through the high temperature gas pipe. 3. A non-azeotropic mixed refrigerant charging apparatus for charging a replenishing non-azeotropic mixed refrigerant into a refrigerant circuit of a refrigerating machine, and a cylinder containing the replenishing non-azeotropic mixed refrigerant. And a heater for heating the refrigerant for vaporizing the non-azeotropic mixed refrigerant filled in the refrigerant circuit through the non-azeotropic mixed refrigerant charging apparatus.