JP3210150B2 - Refrigeration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus used for an electric refrigerator or the like and a compressor thereof.

[0002]

2. Description of the Related Art At the meeting on the revision of the Montreal Protocol on Ozone-Depleting Substances of the Convention on the Protection of the Ozone Layer, the elimination of chlorofluorocarbons (CFCs) in 1996 was agreed. 25 since 1994 compared to 1986
Significant reductions to under-percent are being implemented, further spurring regulation. Four to five years ago, research and development for the complete elimination of CFCs has been actively carried out by refrigerant manufacturers, refrigerator manufacturers, and oil manufacturers, and the technology related to substitution has almost reached the completion area. Hereinafter, an example of the above-described conventional refrigeration apparatus will be described with reference to the drawings.

FIG. 5 shows a refrigeration apparatus disclosed in Japanese Patent Application Laid-Open No. 4-183788 and a refrigeration cycle 1 shown in FIG.
5 is filled with a refrigerant mainly composed of a carbon fluoride-based refrigerant containing no chlorine, for example, a refrigerating machine oil based on HFC-134a and an ester oil compatible with the refrigerant. ing.

[0004]

However, the refrigerant H
FC-134a has few compatible oils and is specified as the following ester oil. CFC1 which price used until now
Price is 5-6 times more expensive than 2. It is said that although ODP (ozone depletion ability) is good, there is some concern about GWP (global warming ability), and from this aspect, refrigerants without GWP concern are being studied.

[0005] On the other hand, esters, which are refrigeration oils, are inferior in hydrolytic stability and hygroscopicity and require special equipment investment in order to eliminate water. Esters are 3 to 3 times cheaper than mineral oils and alkylbenzene oils conventionally used.
4 times more expensive.

[0006] When an ester is used, the capillary tube of the refrigeration system is easily clogged with contaminants.
In order to prevent such a problem, the components of the refrigeration cycle must be washed by a special method.

SUMMARY OF THE INVENTION In view of the above problems, the present invention is to provide a refrigeration system at low cost without any trouble by responding to newly generated problems.

[0008]

SUMMARY OF THE INVENTION In order to solve the above problems, a refrigeration system of the present invention comprises a compressor, a condenser, an expansion mechanism, and an evaporator to form a series of refrigerant flow paths. Evacuation tube of the refrigerating device enclosing the refrigerant mainly composed of hydrocarbons and refrigerating machine oil, crushing the portion from the pinch portion to the tip of the gas charge port tube into a flat plate,
The tip was sealed by soldering.

A vacuum tube for a refrigeration system, which includes a compressor, a condenser, an expansion mechanism, and an evaporator, forms a series of refrigerant channels, and contains a refrigerant mainly composed of hydrocarbons and refrigeration oil. Then, the portion from the pinch portion to the tip of the gas charge port tube was crushed in a flat plate shape, and the tip was sealed by welding.

Further, a gas charge port tube of a refrigeration system including a compressor, a condenser, an expansion mechanism, and an evaporator, forming a series of refrigerant flow paths, and enclosing a refrigerant mainly composed of hydrocarbons and refrigeration oil. Is pinch-sealed and an adhesive is solidified and sealed between the pinch sealing portion and the tip.

[0011]

According to the present invention, since the refrigerant mainly contains a hydrocarbon such as propane or butane as a main component, the concern of GWP is eliminated. In the refrigerating machine oil, mineral oil and alkylbenzene can be used because the refrigerant is highly soluble. Further, it is not necessary to deal with contaminants in the capillary tube, and special washing is not required. In addition, hydrocarbon-based ones are inexpensive and, as described above, require less trouble, so that a refrigeration apparatus can be provided at low cost.

However, hydrocarbon-based refrigerant and HFC-152
There is a new problem that refrigerant a is flammable and cannot be mass-produced due to the danger of explosion if it cannot cope with it.

According to the present invention, the gap between the pinch portion and the tip of the gas port tube is crushed into a flat plate to eliminate the gas reservoir, thereby preventing ignition and eliminating the danger of explosion, and meeting new problems. Is what you do.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a refrigerating apparatus according to one embodiment of the present invention will be described.
This will be described with reference to the drawings. The same parts as those in the conventional example will be described using the same reference numerals, and the same parts in the configuration and operation will be omitted.

In FIG. 1, reference numeral 21 denotes a compressor, 22 denotes a condenser, 23 denotes an expansion mechanism, 24 denotes an evaporator, 25 denotes a drier, and 26 denotes a pipe to form a series of refrigerant flow paths.

In FIG. 2, 21 is a compressor shown in a sectional view, 25 is a dryer having two ports 25a, 30 is a gas charge port tube with a process sealing plug 36 attached to the end thereof, and a vacuum integrated therewith. An inlet 37 is provided. The refrigerating device evacuates from the evacuation port 37 until a predetermined vacuum value is reached. Next, the evacuation tube 35 is sealed and brazed. Subsequently, a coupler is attached to the vacuum port 37 of the gas charge port tube 30 to seal the refrigerating machine oil, and then a hydrocarbon such as propane or butane or a refrigerant mainly composed of HFC-152a is sealed. However, since the hydrocarbons are flammable, using an open flame as in the past is likely to cause an explosion or fire,
This is particularly problematic. The present invention performs the following assembling work in order to cope with flammability, which is a new problem.

The vacuum evacuation tube 35 and the gas charge port tube 30 shown in FIG. 2 are opened, and the other tubes are brazed using an open flame so as to form a series of refrigerant channels as shown in FIG. . Subsequently, the process sealing plug 36
Is set as shown in FIG. 2 and the evacuation port 37 is evacuated until the refrigerator reaches a predetermined vacuum value. When the evacuation is completed, the evacuation tube 35 is pinched, the process sealing plug 36 is removed, and the evacuation tube 35 is sealed using an open flame.

In the final step, the vacuum outlet 3 of the process sealing plug 36 attached to the gas charge port tube 30
Add a predetermined amount of refrigerating machine oil from 7. Further, a refrigerant mainly containing hydrocarbons (claims 4 to 6 are flammable refrigerants mainly containing HFC-152a).

The gas charge port tube 30 is sealed as follows. In FIG. 3, the pinch portion 31 is pinched with a jig, the process sealing plug 36 is pulled out, and crushed into flat plates 32 and 33 with a scissor jig or a roller jig. If the material is selected from the annealed material of the deoxidized copper tube, it can be easily formed by crushing.

The flammable gas is prevented from leaking by crushing for a longer time. If the tip 34 is soldered, the assembly is completed. For comparison, a conventional gas charge port tube 16 will be described with reference to FIG.

The pinch portion 17 was pinched to crush the tip 19 while leaving the straight pipe portion 18, and this portion was sealed by brazing. In this method, since gas remains in the straight pipe portion 18, if the gas is flammable, explosion and combustion become problems.

In the present invention, the flat plate portion 33 can be stopped by seam welding as shown in FIG. Further, it is also possible to confirm that the sealing gas does not leak by crushing and braze the tip 34 with an open flame.

FIG. 4 shows an example in which the pinch portion 35 is sealed with an adhesive without using an open flame or soldering, and the process sealing plug 36 is removed. By filling the cap 37 with an adhesive (for example, a two-component epoxy resin adhesive) and covering the straight pipe portion 36, the adhesive is solidified and sealed as shown in the figure.

HFC-152a, which can be used as a refrigerant other than hydrogen oxide, is flammable and can be treated in the same manner as the above-mentioned hydrocarbons to prevent explosion and fire.

In the refrigeration apparatus in which the flammable refrigerant is filled, the gas charge port tube is sealed by pinching the pinch portion and then crushed into a flat plate to eliminate the refrigerant pool. In addition, the refrigerant is prevented from leaking in the crushing part. After that, sealing with an adhesive, sealing with soldering, and (when there is no complete leakage of the refrigerant, brazing with an open flame is also possible), allows even a combustible refrigerant to be used without danger of explosion or combustion.

Therefore, it is possible to safely use a hydrocarbon-based refrigerant having no concern about ODP and GWP, and to provide an inexpensive refrigeration apparatus.

[0027]

As described above, the present invention comprises a compressor, a condenser, an expansion mechanism, and an evaporator to form a series of refrigerant flow paths, and a refrigerant mainly composed of hydrocarbons and a refrigerating machine oil. The space between the pinch portion and the tip of the vacuum evacuation tube and gas charge port tube of the enclosed refrigeration system is crushed in a flat plate shape, and the tip is soldered, sealed, welded and sealed.

According to another method, the gas charge port tube is pinched and sealed between the pinch sealed portion and the tip to seal the adhesive, thereby having the following effects. (1) From the viewpoint of environmental protection, it is possible to safely use a hydrocarbon-based refrigerant having no concern about ODP and GWP so that there is no danger of explosion or combustion. (2) HFC-152a flammable refrigerant can be used safely as described above. (3) Mineral oil or alkylbenzene can be used as the refrigerant oil for the refrigerants of the above (1) and (2).
A special refrigeration apparatus can be provided at low cost because special water management and special washing are not required and the number of steps is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a refrigeration apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a perspective view of the gas charge port tube of FIG. 2 when it is sealed.

FIG. 4 is a cross-sectional view at the time of sealing according to the alternative of FIG. 3;

FIG. 5 is an explanatory view of a conventional refrigeration apparatus.

FIG. 6 is a perspective view of the gas charge port tube of FIG. 5 when it is sealed.

[Explanation of symbols]

 REFERENCE SIGNS LIST 20 Refrigerator 21 Compressor 22 Condenser 23 Expansion mechanism 24 Evaporator 30 Gas charge port tube 31 Pinch section 32 Flat plate 35 Vacuum evacuation tube 40 Gas charge port tube 41 Pinch section 42 Straight pipe section 43 Cap 44 Adhesive

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-213972 (JP, A) JP-A-3-260570 (JP, A) Japanese Utility Model Application Sho 64-45259 (JP, U) (58) Field (Int.Cl. ⁷ , DB name) F25B 45/00 F25B 41/00

Claims (3)

(57) [Claims] 1. A series of refrigerant passages comprising a compressor, a condenser, an expansion mechanism, and an evaporator, wherein hydrocarbons and HFC-1 are formed.
The space between the pinch portion and the tip of the vacuum evacuation tube or the gas charge port tube of the refrigerating apparatus in which the refrigerant containing 52a as a main component and the refrigerating machine oil are crushed in a flat plate shape, and the tip is sealed by soldering. A refrigeration apparatus characterized by the above-mentioned. 2. A series of refrigerant passages including a compressor, a condenser, an expansion mechanism, and an evaporator, and a hydrocarbon or HFC-1.
That the portion from the pinch portion to the tip of the vacuum evacuation tube or the gas charge port tube of the refrigerating device in which the refrigerant containing 52a as a main component and the refrigerating machine oil are sealed is flattened, and the tip is sealed by welding. Characterized refrigeration equipment. 3. A series of refrigerant flow paths including a compressor, a condenser, an expansion mechanism, and an evaporator, and a hydrocarbon or HFC-1.
The evacuation tube or the gas charge port tube of the refrigerating device in which the refrigerant mainly containing 52a and the refrigerating machine oil are sealed is sealed with a pinch portion, and the adhesive is hardened between the pinch sealing portion and the tip. A refrigeration apparatus characterized by being sealed by sealing.