JPH07269904A - Refrigeration cycle - Google Patents

Abstract

PURPOSE:To prevent a refrigerant of the HCFC type or CFC type from mixing into a refrigerating cycle using a refrigerant of HFCs. CONSTITUTION:The subject relates to a refrigerating cycle in which an outdoor apparatus 6 and an indoor apparatus 8 are provided separately from each other, the outdoor apparatus 6 and the indoor apparatus 8 are connected by connection piping 9, and a refrigerant of HFCs is circulated. At piping-connecting parts 10 provided in the outdoor apparatus 6 a means of discrimination for identifying the refrigerant in use as one of HECs is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating cycle in which an outdoor unit and an indoor unit are formed as separate units and an HFC refrigerant is circulated.

[0002]

2. Description of the Related Art A commonly used split type air conditioner has an outdoor unit installed outdoors, an indoor unit installed at an appropriate position on a wall or a room, and an outdoor unit and an indoor unit are connected by a connecting pipe. Although an HCFC type or CFC type refrigerant is circulated, the socket and hexagonal flare nut provided in the outdoor unit are forward screws (right-hand thread), and the socket hexagonal flare nut provided in the indoor unit is also It is a forward screw (right screw).

However, when the HCFC-type or CFC-type refrigerant is released into the atmosphere, it rises in the atmosphere and reacts with ozone in the ozone layer surrounding the earth to destroy the ozone layer. It has been found that the amount of ultraviolet rays emitted increases, which adversely affects humanity.

Therefore, in order to prevent the destruction of the ozone layer surrounding the earth due to the use of these HCFC type and CFC type refrigerants, the production of CFC type refrigerants is stopped and
It has been decided to completely abolish the use of type refrigerants by the end of 1995 and regulate the use of HCFC type refrigerants from 1996.

The use of HFCs as a substitute for the HCFC-type or CFC-type refrigerants used in the refrigeration cycle has been studied, but since HFCs are polar refrigerants, they are compatible as refrigerating machine oil. Therefore, highly polar ester type and PAG type have been investigated.

[0006]

However, when a refrigerant containing chlorine such as HCFC type or CFC type is mixed in the refrigeration cycle using the HFC type refrigerant, refrigerating machine oil (ester) of the refrigeration cycle using the HFC type refrigerant is used. System and PA
G) chemically reacts with the HCFC type or CFC type refrigerant to generate hydrochloric acid, and due to the generation of this hydrochloric acid, the insulation performance of the magnet wire is deteriorated and a copper plating phenomenon (copper plating) occurs. Problem and HCF
Due to poor solubility of the refrigerating machine oil (ester-based or PAG) in the C-type or CFC-type refrigerant, there is a problem that the oil return property is deteriorated.

The present invention has been made in view of the above points, and an object of the present invention is to provide a refrigeration cycle using an HFC type refrigerant, which reliably prevents mixing of an HCFC type or CFC type refrigerant. .

[0008]

According to the refrigeration cycle of the present invention, it is identified that the outdoor unit and the indoor unit are constituted by different units, and the HFC type refrigerant is used as the refrigerant in the pipe connecting portion provided in the outdoor unit. It is characterized in that an identifying means is provided.

[0009]

In the refrigerating cycle of the present invention, since the pipe connecting portion connecting the outdoor unit and the indoor unit is provided with the identifying means for identifying that the HFC type refrigerant is used as the refrigerant, the outdoor unit using the HFC type refrigerant is used. Can be surely confirmed that
The HCFC type or CF is mistaken for an outdoor unit that uses a Class C refrigerant.
Connect an indoor unit that uses a C type refrigerant, or use an HCFC
Type or CFC type refrigerant is not replenished.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a refrigeration cycle of the present invention. The refrigeration cycle 1 includes a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, an outdoor unit 6 provided with a throttle device 5, and an indoor heat exchanger 7. The indoor unit 8 is connected by connecting pipes 9, 9.
That is, the connection pipe 9 connects the pipe connection portion 10 provided at the pipe end on the outdoor unit 6 side and the pipe connection portion 11 provided at the pipe end on the indoor unit 8 side. In FIG. 1, solid arrows indicate the flow of the refrigerant during the cooling operation, and dotted arrows indicate the flow of the refrigerant during the heating operation.

The pipe connecting portion 10 is a packed valve as shown in FIG. 2, and the pipe 12 of the outdoor unit 6 is connected to the packed valve, and the pipe connecting port 13 and the refrigerant replenishing connecting port 14 are connected. Is provided. The screw portion 13a provided on the outer surface of the pipe connection port 13 is a reverse screw (left screw).
In addition, the screw portion 14a provided on the outer surface of the refrigerant replenishing connection port 14 is also a reverse screw (left screw) like the screw portion 13a.
Is. A screw nut 13a provided on the outer surface of the pipe connection port 13 is screwed with a flare nut 15 of a reverse screw (left screw),
A nut 16 of a reverse screw (left screw) is screwed into the screw portion 14a of the refrigerant replenishing connection port 14.

The pipe connecting portion 11 is a reverse screw (left screw) formed at the end of the pipe 17 of the indoor unit 8 as shown in FIG.
And a flare nut 19 of a reverse screw (left screw) provided at the end of the connection pipe 9. In addition, in the indoor unit of the refrigeration cycle using the HCFC type or CFC type refrigerant, the HCFC type or C for checking the leakage of the refrigerant is used.
FC type refrigerant is enclosed.

Thus, the refrigeration cycle using the HFC type refrigerant is constructed by connecting the outdoor unit 6 containing the HFC type refrigerant and the indoor unit 8 containing the HFC type refrigerant with the connecting pipes 9, 9. However, the pipe connection portion 10 of the outdoor unit 6 and the pipe connection portion 11 of the indoor unit 8 in which the HFCs refrigerant is enclosed are respectively reverse screws (left screw), and the outdoor unit 6 and the HCFCs in which the HFCs refrigerant is enclosed and the HCFC are enclosed. Even if an indoor unit enclosing a CFC-type or CFC-type refrigerant is attempted to be connected by a connection pipe, the connection pipe 9 cannot be connected because the screw direction of the pipe connection portion 11 is different, and the outdoor unit 6 uses an HFC type refrigerant. Can be identified.

Further, since the screw portion 14a provided on the outer surface of the refrigerant replenishing connection port 14 is a reverse screw (left screw), the connection pipe is long or the amount of refrigerant in the refrigeration cycle is insufficient due to movement of the set, so that the refrigeration cycle. When replenishing the refrigerant with refrigerant, since the connecting pipe of the container in which the HCFC type or CFC type refrigerant is enclosed is a forward screw (right screw), the mutual pipes cannot be connected and refrigeration using HFC type refrigerant is performed. There is no accidental replenishment of HCFC type or CFC type refrigerant in the cycle.

In the above-described embodiment, as an identification means for preventing the HCFC type or CFC type refrigerant from being mixed in the refrigeration cycle using the HFC type refrigerant, the outdoor unit and the indoor unit of the refrigeration cycle using the HFC type refrigerant are used. By changing the screw direction of the screw part provided in the pipe connection part to the opposite screw direction of the screw part provided in the pipe connection part of the outdoor unit and the indoor unit of the refrigeration cycle using the refrigerant of HCFC type or CFC type. ,
Although it was identified that the outdoor unit 6 uses an HFC type refrigerant, and the connection was made so that it could only be connected to an outdoor unit of the same type and an indoor unit, the refrigeration cycle using the HFC type refrigerant was of the HCFC type or CFC type. As another identification means for preventing the mixture of the refrigerant, a color different from the paint (for example, brass color) of the HCFC type or CFC type pipe connection portion (for example, black color) is used for the pipe connection portion of the refrigeration cycle using the HFC type refrigerant. ) Is applied, or the flare nut screwed to the pipe connection portion is a different corner of the hexagonal flare nut screwed to the HCFC type or CFC type pipe connection portion, for example, an octagonal flare nut, A special mark may be provided on the pipe connecting portion.

[0016]

As described above, according to the present invention, the HF
In the refrigeration cycle using the C-type refrigerant, it can be surely identified that the HFC-type refrigerant is used.
It is possible to reliably prevent the mixture of the C type refrigerant.

[Brief description of drawings]

FIG. 1 is a diagram showing a refrigeration cycle according to the present invention.

FIG. 2 is a diagram showing a pipe connection portion of an outdoor unit.

FIG. 3 is a diagram showing a pipe connection portion of an indoor unit.

[Explanation of symbols]

 1 Refrigeration cycle 6 Outdoor unit 8 Indoor unit 9 Connection pipe 10 Pipe connection part 11 Pipe connection part

Claims (4)

[Claims] 1. In a refrigeration cycle in which an outdoor unit and an indoor unit are configured as separate units, the outdoor unit and the indoor unit are connected by a connecting pipe, and an HFC type refrigerant is circulated, the pipe connecting portion provided in the outdoor unit is used as a refrigerant. A refrigeration cycle characterized by being provided with an identification means for identifying that an HFC type refrigerant is used. 2. The refrigerating cycle according to claim 1, wherein a screw of the pipe connecting portion is a reverse screw to serve as an identifying means. 3. A pipe connecting portion provided in the outdoor unit is provided with a charge port for replenishing the refrigerant, and a screw at a connection port of the charge port is a reverse screw to serve as an identifying means. Refrigeration cycle described in. 4. The refrigerating cycle according to claim 1, wherein the identifying means is a shape, a color or a mark.