JPH0835749A - Refrigerant circuit - Google Patents

Abstract

PURPOSE:To provide a refrigerant circuit which can easily recover refrigerant without using any refrigerant recovery device. CONSTITUTION:In a refrigerant circuit having a compressor 1, a condenser 5, a first pressure reducing device 7 and an evaporator 9 interconnected in that order in a circular form, a series circuit consisting of a refrigerant tank 101 and a second pressure reducing device 104 is provided in parallel connection with the first pressure reducing device and the evaporator and a refrigerant flow switching means is provided which conducts the refrigerant discharged from the compressor to either of the series circuit consisting of the first pressure reducing device and the evaporator or the series circuit consisting of the refrigerant tank and the second pressure reducing device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant circuit which can easily recover the refrigerant from the refrigerant circuit when discarding refrigeration equipment.

[0002]

2. Description of the Related Art Generally, a refrigerant circuit in which a compressor, a condenser, a pressure reducing device and an evaporator are connected in sequence is known. The refrigerant in this kind of refrigerant circuit is generally collected in a tank when discarding refrigeration equipment.

[0003]

Usually, a refrigerant recovery device is prepared in advance, and the refrigerant in the circuit is recovered by using it. However, the refrigerant recovery device is often large in size and has a processing space for recovery. If it does not, it may be difficult to recover it.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a refrigerant circuit which can easily recover a refrigerant without using a refrigerant recovery device or the like. .

[0005]

In order to achieve the above object, the present invention provides a first pressure reducing device in a refrigerant circuit in which a compressor, a condenser, a first pressure reducing device and an evaporator are sequentially connected in an annular shape. A series circuit including a refrigerant tank and a second pressure reducing device in parallel with the evaporator, and a refrigerant discharged from the compressor including a series circuit including the first pressure reducing device and the evaporator; Refrigerant flow path switching means leading to either one of a series circuit including a second pressure reducing device is provided.

Further, according to the present invention, in a refrigerant circuit in which a compressor, a condenser, a first pressure reducing device and an evaporator are sequentially connected in an annular shape, a refrigerant tank and a second tank are provided in parallel with the first pressure reducing device and the evaporator.
A series circuit consisting of the decompressor of
Refrigerant flow path switching means is provided for guiding the refrigerant discharged from the compressor to either a series circuit including the first pressure reducing device and the evaporator or a series circuit including the refrigerant tank and the second pressure reducing device. An on-off valve is provided between the tank and the second pressure reducing device.

Further, the present invention is directed to a compressor, a condenser, a first
In the refrigerant circuit in which the decompression device and the evaporator are sequentially connected in an annular shape, an opening / closing valve that allows the condenser to be separated from the refrigerant circuit is arranged before and after the condenser in the refrigerant circuit.

[0008]

According to the present invention, since the refrigerant circuit is provided with the refrigerant recovery means for recovering the refrigerant, the recovery of the refrigerant is simplified, and after the recovery of the refrigerant, the means may be separated from the refrigeration equipment. Therefore, only the remaining refrigeration equipment can be transported to the treatment plant for disposal.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a refrigerant circuit of an air conditioner. Reference numeral 1 is a compressor, which includes a four-way valve 3, an outdoor heat exchanger 5, a capillary tube (first
Pressure reducing device 7) and the indoor heat exchanger 9 are connected in order. And this indoor heat exchanger 9 through the four-way valve 3,
Connected to the accumulator 11, accumulator 1
1 is connected to the compressor 1. 13 is a muffler,
Reference numeral 15 is a strainer.

Further, according to this embodiment, the manual opening / closing valve 17 is provided between the outdoor heat exchanger 5 and the capillary tube 7.
Is provided, and a bus path passage 19 is led out from between the manual opening / closing valve 17 and the outdoor heat exchanger 5, and the bus path passage 19 is connected to the compressor 1 via the accumulator 11.

A coolant recovery means 100 including a coolant recovery tank 101 is provided in the bus path passage 19. Manual open / close valves 102 and 103 are provided in front of and behind the refrigerant recovery tank 101, and a capillary tube (second pressure reducing device) 104 is provided on the outlet side of the manual open / close valve 103.
Is provided. 105 is a union. The manual on-off valves 17, 102, 103 may be automatic on-off valves.

The solid arrows indicate the flow of the refrigerant during cooling. At this time, the outdoor heat exchanger 5 serves as a condenser and the indoor heat exchanger 9 serves as an evaporator. Also, the dotted arrow indicates the flow of the refrigerant during heating, and at this time, it functions in the opposite manner to the above, and the indoor heat exchanger 9 serves as a condenser and the outdoor heat exchanger 5 serves as an evaporator.

With reference to FIG. 2, in this embodiment, the refrigerant recovery tank 101 of the refrigerant recovery means 100 described above is housed in the housing A of the outdoor unit.

In the case A, the outdoor heat exchanger 5, the outdoor blower 21, and the compressor 1 are housed in the illustrated state,
The refrigerant recovery tank 101 of the refrigerant recovery means 100 has a casing A.
It is located in one corner.

FIG. 3 shows another embodiment.

According to this, the refrigerant recovery tank 101 is
The refrigerant recovery tank 101 is arranged in one corner of the housing A, and the periphery of the refrigerant recovery tank 101 is surrounded by a double wall 110, thereby exhibiting a soundproof effect.

When a refrigerating machine having a refrigerant circuit as shown in FIG. 1 is discarded, the refrigerant is usually recovered and then disposed.

Conventionally, after transporting a refrigerating machine to be discarded to a treatment site, the refrigerating machine is connected to a refrigerating machine to recover the refrigerating machine, or the refrigerating machine is carried to a place where the refrigerating machine is located, and the refrigerating machine is put there. Do you collect it? In any case, it is troublesome to carry a large refrigerant recovery device, and it is a very difficult task to perform recovery in a place where the processing space is small.

According to this embodiment, however, the refrigerant recovery means 100 provided in the refrigerating machine recovers the refrigerant, so that the above-mentioned inconvenience can be eliminated.

Next, the operation at the time of refrigerant recovery will be described.

First, in order to make the outdoor heat exchanger 5 function as a condenser, the manual opening / closing valve 17 is closed and the manual opening / closing valve 102 is opened while the refrigerating machine is being cooled. Then, the refrigerant condensed and liquefied in the outdoor heat exchanger (condenser) 5 is introduced into the refrigerant recovery tank 101.

When the pressure in the refrigerant recovery tank 101 becomes high and it is difficult to recover the refrigerant, the manual opening / closing valve 10 is appropriately used.
Open 3 Then, the gas refrigerant in the refrigerant recovery tank 101 passes through the capillary tube 104 and passes through the compressor 1
Since the internal pressure of the refrigerant recovery tank 101 is lowered, the recovery of the liquefied refrigerant is promoted. After the refrigerant is recovered, the two unions 105 are removed, the refrigerant recovery tank 101 is removed, and then the remaining refrigeration equipment is transported to the processing site and disposed there.

In short, according to this embodiment, since the refrigerant in the refrigerant circuit is recovered by the refrigerant recovery means provided in the refrigerating machine, there is an advantage that the refrigerant can be easily recovered above all.

FIG. 4 shows another embodiment.

In the refrigerant recovery means 200 of this embodiment, a manual opening / closing valve 201 is provided between the four-way valve 3 and the outdoor heat exchanger 5, and when recovering the refrigerant, the outdoor heat exchanger 5 functions as a refrigerant recovery tank. It has a feature.

That is, at the time of refrigerant recovery, the strainer 15 which is conventionally provided while cooling the refrigerating machine is operated.
The on-off valve 202 at the right end of is closed and the refrigerant is collected in the outdoor heat exchanger 5. Then, after recovering the refrigerant, the two on-off valves 201 and 202 are removed, the outdoor heat exchanger 5 is removed, and then the remaining refrigeration equipment is transported to the treatment site and disposed there.

In this case, the two on-off valves 201, 20
It is desirable to configure the outdoor heat exchanger 5 so that the outdoor heat exchanger 5 can be easily removed in the state where 2 is removed.

[0029]

As is apparent from the above description, according to the present invention, the refrigerant in the refrigerant circuit is recovered by the refrigerant recovery means provided in the refrigeration equipment, so that the refrigerant can be easily recovered.

[0030]

[Brief description of drawings]

FIG. 1 is a circuit diagram of a refrigerant circuit according to the present invention.

FIG. 2 is a layout view of a refrigerant recovery tank.

FIG. 3 is a layout view of a refrigerant recovery tank showing another embodiment.

FIG. 4 is a refrigerant circuit diagram showing another embodiment.

[Explanation of symbols]

 1 Compressor 3 Four-way valve 5 Outdoor heat exchanger 7 Capillary tube (first pressure reducing device) 9 Indoor heat exchanger 11 Accumulator 100,200 Refrigerant recovery means 101 Refrigerant recovery tank 102,103 Manual on-off valve 104 Capillary tube (second) Pressure reducing device) 201,202 Manual on-off valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akutsu Hoho 2-5-5 Keihan Hon-dori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Katsumi Miyamoto 2-chome, Keihan-hondori, Moriguchi-shi, Osaka No. 5-5 Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. In a refrigerant circuit in which a compressor, a condenser, a first pressure reducing device, and an evaporator are sequentially connected in an annular shape, a refrigerant tank and a second pressure reducing device are arranged in parallel with the first pressure reducing device and the evaporator. A series circuit configured is provided, and the refrigerant discharged from the compressor is guided to either the series circuit including the first pressure reducing device and the evaporator or the series circuit including the refrigerant tank and the second pressure reducing device. A refrigerant circuit provided with a refrigerant flow path switching means. 2. In a refrigerant circuit in which a compressor, a condenser, a first pressure reducing device, and an evaporator are sequentially connected in an annular shape, a refrigerant tank and a second pressure reducing device are arranged in parallel with the first pressure reducing device and the evaporator. A series circuit configured is provided, and the refrigerant discharged from the compressor is guided to either the series circuit including the first pressure reducing device and the evaporator or the series circuit including the refrigerant tank and the second pressure reducing device. A refrigerant circuit comprising a refrigerant flow path switching means, and an opening / closing valve provided between the refrigerant tank and the second pressure reducing device. 3. In a refrigerant circuit in which a compressor, a condenser, a first pressure reducing device, and an evaporator are sequentially connected in an annular shape, an opening / closing valve for separating the condenser from the refrigerant circuit is provided in the refrigerant circuit before and after the condenser. Refrigerant circuit characterized by being arranged.