JP2001280757A - Refrigerating unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerating unit in which an adverse influence of a lead on a human body or an environment is reduced. SOLUTION: The refrigerating unit comprises a condenser 3 for condensing and liquefying a refrigerant, an expansion valve 10 for regulating a pressure of the refrigerant, an evaporator 11 for evaporating the liquefied refrigerant, an accumulator, a sealed compressor 1 for compressing the evaporated and vaporized refrigerant to discharge the refrigerant to the condenser and the like. In the case, connecting valves a to e each casing a leadless brass alloy not containing a lead are used instead of connecting valves a to e using a brass alloy containing the lead. Further, it is preferred to use a closing member using the leadless brass alloy not containing the lead instead of a closing member using the brass alloy containing the lead.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a refrigeration apparatus,
More specifically, the present invention relates to a refrigerating apparatus provided with a connection valve using a lead-free brass alloy that does not contain lead and causes pollution to the human body and environment.

[0002]

2. Description of the Related Art A refrigerating apparatus having a refrigerating circuit including a condenser, an expansion valve, an evaporator, an accumulator, a hermetic compressor, and the like includes a brass JIS H3250C36.
A large number of connection valves using lead-containing brass alloys such as 04 alloy and C3771 alloy are used in necessary places in the refrigeration circuit, and lead-containing brass is used to close pipes not used for the time being in the refrigeration circuit. Many closure members made of an alloy-based flare nut, union, bonnet, and the like are used.

However, these connection valves and closing members generate lead-containing steam during high-temperature operations such as melting, casting, and welding during manufacturing, and generate lead-containing dust during cutting and grinding. Adversely affect the human body and the environment.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a refrigeration system equipped with a connection valve using a lead-free lead-free brass alloy which has an adverse effect on the human body and the environment, or further has an adverse effect on the human body and the environment. An object of the present invention is to provide a refrigerating apparatus using a closing member using a lead-free brass alloy containing no lead.

[0005]

In order to solve the above-mentioned problems, a first aspect of the present invention is a condenser for condensing and liquefying a refrigerant, an expansion valve for adjusting the pressure of the refrigerant, and an evaporator for evaporating a liquefied refrigerant. A refrigerating system equipped with a compressor, an accumulator, and a hermetic compressor that compresses the vaporized refrigerant and discharges the refrigerant to a condenser, and uses lead-free brass alloy instead of a connection valve using lead-free lead-free. A refrigeration apparatus comprising a connection valve using a brass alloy.

According to a second aspect of the present invention, in the hermetic compressor according to the first aspect, the lead-free brass alloy is a lead-free brass alloy containing Bi and Sn or a lead-free brass alloy containing Bi and Ce. Features.

According to a third aspect of the present invention, there is provided the hermetic compressor according to the first or second aspect, wherein the closing member using a lead-free brass alloy is replaced with a closing member using a lead-free brass alloy. It is characterized by using a member.

According to a fourth aspect of the present invention, in the hermetic compressor according to any one of the first to third aspects, two connection valves using a lead-free brass alloy containing no lead are provided and welding is performed. Instead, a hermetic compressor in which a hermetic container is formed using bolts, nuts, and the like is used.

[0009]

Embodiments of the present invention will be described below in detail. Hereinafter, the present invention will be described with reference to FIGS. FIG. 1 shows an example of a refrigeration circuit of the refrigeration apparatus of the present invention.
Reference numeral 1 denotes a condenser which compresses a refrigerant evaporated and vaporized through a pipe 2
, A pipeline for sending the refrigerant condensed and liquefied by the condenser 3 to a receiver tank 5 for temporarily storing the refrigerant, a pipeline 6 for sending the refrigerant from the receiver tank 5, and a refrigerant from the receiver tank 5. Is provided with a filter dryer 7 for removing foreign substances and moisture in the refrigeration circuit, a sight glass 8, an electromagnetic valve 9, and an expansion valve 10 for reducing pressure. The refrigerant evaporates in the evaporator 11 to generate cold heat, and the evaporated refrigerant returns to the hermetic compressor 1 via the pipe 12. 13 is an accumulator, 14 is a high / low pressure switch, 15 is a low pressure gauge, 1
Reference numerals 6 and 17 denote fans, and reference numeral 18 denotes a high-pressure gauge.

In FIG. 1, a pipe 2 is connected to a hermetic compressor 1 via a connection valve a, a pipe 4 is connected to a receiver tank 5 via a connection valve b, and a high pressure gauge 18 is provided. Is connected to the receiver tank 5 via the connection valve c, and the pipe 6 is connected to the receiver tank 5 via the connection valve d. The pipe 6 on the receiver tank 5 side and the expansion valve 1
The pipeline 6 on the 0 side is connected via an electromagnetic valve 9 (connection valve), and the pipeline 12 is connected to the hermetic compressor 1 via a connection valve e.

Conventionally, connection valves and solenoid valves using a brass alloy containing lead have been used as these connection valves and solenoid valves. In the present invention, connection valves a to e using lead-free lead-free brass alloys instead of these connection valves and solenoid valves are used.
And an electromagnetic valve 9.

The lead-free brass alloy used in the present invention includes:
Although not particularly limited, for example, Zn: 20 to 20% by mass as described in JP-A-7-310133.
45%, Bi: 0.2 to 4%, Sn: 0.2 to 3%, with the balance being Cu and impurities Bi- and Sn-free lead-free free-cutting brass alloy having excellent dezincification corrosion resistance and the like. 5
As described in -255778, 57 to 61% by mass of Cu and 0.5 to 4.0% of Bi,
A lead-free free-cutting brass alloy containing 0.1 to 0.9% of a misch metal such as Ce or La and containing Bi or Ce with the balance being Zn can be given.

FIG. 2 is an explanatory plan view of the hermetic compressor 1 used in the refrigerating apparatus of the present invention shown in FIG. FIG. 3 shows FIG.
FIG. 4 is an explanatory plan view of a connection valve a using a lead-free lead-free brass alloy provided in the hermetic compressor 1 shown in FIG. FIG.
FIG. 4 is an explanatory sectional view of a connection valve a using a lead-free lead-free brass alloy shown in FIG. 3.

The hermetic compressor 1 is provided with two connection valves, a connection valve a and a connection valve e using a lead-free brass alloy containing no lead. This is not a type in which a space is created, but a type in which various parts are connected to each other by using a number of bolts and nuts 28 to form a sealed space therein as shown in FIG.

[0015] It is difficult to replace or repair parts in a sealed container with a welded type, whereas a type using bolts and nuts 28 can be obtained by removing bolts and nuts 28 at required locations. The components in the sealed container 19 can be easily replaced or repaired, and after replacing or repairing the components, the components are assembled again using the bolts and nuts 28 so that the inside becomes the closed space as before. be able to.

As shown in FIG. 4, a connection valve a using a lead-free brass alloy containing no lead includes a cap 20 made of Teflon containing hard glass, a main body 21 made of a lead-free brass alloy,
Stainless steel valve stem 22, packing restraint 23 made of lead-free brass alloy, polytetrafluoroethylene (PT
FE) packing 24, a closing member f1 including a flare nut 25 made of a lead-free brass alloy, a bonnet 26 made of a lead-free brass alloy, and the like.

The above-mentioned closing member f1 is attached to the distal end of the pipe line 27 to prevent the refrigerant from flowing out of the pipe line 27, which is not used for the time being, provided in the connection valve a, and to close it. .

Other closed valves f2 to f4 having the same configuration and the same purpose as the above-mentioned closing member f1 are mounted on the hermetic compressor 1.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the appended claims.

[0020]

According to the first aspect of the present invention, there is provided a refrigerating apparatus comprising: a condenser for condensing and liquefying a refrigerant; an expansion valve for adjusting the pressure of the refrigerant; an evaporator for evaporating a liquefied refrigerant; an accumulator; A refrigeration system equipped with a hermetic compressor that compresses and discharges it to a condenser, and includes a connection valve using a lead-free lead-free brass alloy instead of a connection valve using a brass alloy containing lead Therefore, lead-containing steam is generated during high-temperature operations such as melting, casting, and welding in the production of connection valves, lead-containing dust is generated during cutting and grinding, or similar problems occur during recycling. It has a remarkable effect that it does not adversely affect the human body or the environment due to occurrence.

The refrigeration apparatus according to claim 2 of the present invention is characterized in that the lead-free brass alloy is a lead-free brass alloy containing Bi and Sn,
Since it is a lead-free brass alloy containing i and Ce, it has a remarkable effect that not only does it have no adverse effect on the human body and the environment, but also that the cutting property during the production of the connection valve is improved and the corrosion resistance is also improved.

In the refrigerating apparatus according to the third aspect of the present invention, the closing member using a lead-free brass alloy containing no lead is used instead of the closing member using a brass alloy containing lead, so that the human body and the environment can be further improved. It has a remarkable effect that it does not adversely affect the environment.

The refrigerating apparatus according to claim 4 of the present invention includes two connection valves using a lead-free brass alloy containing no lead, and forms a closed container using bolts, nuts and the like without welding. Using a compact compressor, the structure is simple and it does not adversely affect the human body or the environment.Besides, by removing bolts and nuts at the required places, the parts in the sealed container are not adversely affected by lead. It can be easily replaced or repaired, and after replacing or repairing parts, it has a remarkable effect that it can be assembled again using bolts and nuts so that the inside becomes a closed space as before. Play.

[Brief description of the drawings]

FIG. 1 is a refrigeration circuit diagram of an example of a refrigeration apparatus of the present invention.

FIG. 2 is an explanatory plan view of a hermetic compressor used in the refrigeration apparatus of the present invention shown in FIG.

FIG. 3 is an explanatory plan view of a connection valve using a lead-free lead-free brass alloy provided in the hermetic compressor shown in FIG. 2;

FIG. 4 is a sectional explanatory view of a connection valve using a lead-free lead-free brass alloy shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hermetic compressor 3 Condenser 5 Receiver tank 7 Filter dryer 9 Solenoid valve 10 Expansion valve 11 Evaporator 13 Accumulator ae Connection valve 19 Hermetic container 25 Flare nut 26 Bonnet 28 Bolt and nut

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Yasuaki Seyama 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3H052 AA01 BA35 CA19 CC09 EA01 EA16 3H054 AA01 BB30 CA26 CC05 GG01

Claims (4)

[Claims] 1. A condenser for condensing and liquefying a refrigerant, an expansion valve for adjusting the pressure of the refrigerant, an evaporator for evaporating a liquefied refrigerant, an accumulator, and a hermetic compression for compressing the vaporized refrigerant and discharging the refrigerant to the condenser. A refrigeration system comprising a chiller and the like, characterized by comprising a connection valve using a lead-free lead-free brass alloy instead of a connection valve using a lead-containing brass alloy. 2. The hermetic compressor according to claim 1, wherein the lead-free brass alloy is a lead-free brass alloy containing Bi and Sn, or a lead-free brass alloy containing Bi and Ce. 3. The refrigerating apparatus according to claim 1, wherein a closing member using a lead-free brass alloy containing no lead is used instead of the closing member using a brass alloy containing lead. 4. A hermetic compressor having two connection valves using a lead-free brass alloy containing no lead and using a bolt, nut or the like to form a closed container without using welding. The refrigeration apparatus according to any one of claims 1 to 3, wherein