JP2002267278A - Cooler of refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a cooler of a refrigerator from which a harmful substance, i.e., lead, is eliminated. SOLUTION: A pressure-reducing device 8, provided with a planar part on the outer surface and a refrigerant return pipe 9 provided with a planar part on the outer surface are arranged juxtaposed, jointed and heat is exchanged between them so as to obtain the cooler of a refrigerator which does not contain lead.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cooling device such as a refrigerator.

[0002]

2. Description of the Related Art In recent years, environmental destruction due to disposal of used home electric appliances has become a problem.

Conventionally, refrigerators for cooling refrigerators are disclosed in
What is described in 16788 gazette is known.

Hereinafter, the conventional refrigerator cooling device will be described with reference to the drawings.

FIG. 11 shows a conventional refrigerator cooling device. In FIG. 11, 1 is a compressor, 2 is a condenser, 3
Is a decompressor, 4 is an evaporator, and 5 is a refrigerant return pipe. They are connected by a pipe 6 to form a cooling cycle in the above order,
Refrigerant circulates.

The operation of the refrigerator having the above-described structure will be described below.

First, the high-temperature and high-pressure refrigerant leaving the compressor 1 is:
In the gas state, heat is radiated by the condenser 2, passes through the next decompressor 3, turns into a liquid state, evaporates in the evaporator 4, and turns into gas again. The heat of vaporization at this time is absorbed from the periphery of the evaporator 4 and becomes cool air, so that the inside of the refrigerator (not shown) is cooled. The vaporized refrigerant returns to the compressor 1 through the refrigerant return pipe 5, and repeats the above cycle.

When the refrigerant amount is determined on the basis of the summer time when the outside air temperature is high and the food is frequently taken in and out, the required evaporation amount of the refrigerant is small in the winter time when the outside air temperature is low and the food is frequently taken in and out. Compressor 1 with the surplus refrigerant remaining liquid
You will be back. Since the volume of the liquid is smaller than that of the gas when it is compressed, if the liquid is repeatedly compressed for a long time, the durability of the piston (not shown) and the sealing material (not shown) inside the compressor 1 is increased. Affects gender.

When the outside temperature is high such as in summer, the condenser 2
Is insufficient and the refrigerant is not sufficiently liquefied, so that the refrigerant vaporization amount in the evaporator 3 may be insufficient and the refrigeration capacity may be insufficient.

For this reason, by joining the decompressor 3 and the refrigerant return pipe 5 and exchanging heat, liquefaction of the refrigerant is promoted by the decompressor 3 and vaporization of excess liquid refrigerant in the refrigerant return pipe 5 is promoted.

For joining the pressure reducer 3 and the refrigerant return pipe 5, a tin-lead solder 7 which is inexpensive and has good workability is used.

[0012]

However, in the above-described structure, the tin-lead solder contains 37 to 50% of lead, which is a harmful substance. There was a problem that soil and water quality were contaminated with lead after being discarded.

[0013] Lead-free brazing materials other than tin-lead solders have high melting points and poor workability, and adhesives such as hot melt adhesives have poor heat conduction and poor heat exchange effects.
Neither can be applied to cooling devices.

The present invention has been made in view of the above problems, and has as its object to provide a refrigerator for refrigerators which does not contain lead which is a harmful substance.

[0015]

According to a first aspect of the present invention, there is provided a refrigeration cycle comprising a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and a pipe connecting them. The device and the refrigerant return pipe are arranged in parallel, and a flat portion is provided on each outer surface and joined, and heat exchange is performed, so that lead, which is a conventional solder component, is eliminated.

According to a second aspect of the present invention, there is provided a refrigeration cycle comprising a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and a pipe connecting them, wherein the decompressor and the refrigerant return pipe are connected to each other. They are arranged in parallel, and are joined by providing a flat portion on the outer surface except for a predetermined length at each end, thereby improving the workability of piping before and after. This is because the insertion direction of the tube to be connected is restricted when the cross-sectional shape of the tube is a semicircle having a flat portion, but the direction is not restricted when the cross-section of the tube is circular.

The invention according to claim 3 of the present invention comprises a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and a pipe connecting them, and the pressure reducer and the refrigerant return pipe are arranged in parallel. In addition, a flat portion is provided on each outer surface and joined with a hot melt adhesive, and further, there is an effect of improving heat exchange efficiency. This is due to the expansion of the heat exchange area due to the flat portion joining.

Furthermore, the joining operation can be automated.
This is because the performance of hot melt applicators has improved in recent years, and the reliability of temperature control and control of coating plants has increased.

The invention according to claim 4 of the present invention comprises a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and a pipe connecting them, and the decompressor and the refrigerant return pipe are arranged in parallel. In addition, a flat portion is provided on each outer surface and joined by ultrasonic welding, so that the heat exchange area can be increased by joining the flat portions and the outer surfaces can be integrated by welding.

Further, in the case of welding, since the tube itself functions as an adhesive, no special additional material is required, so that an additional material for joining is not required.

The invention according to claim 5 of the present invention comprises a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe and a pipe connecting them, and the decompressor and the refrigerant return pipe are arranged in parallel. In addition, a flat portion is provided on each of the outer surfaces and joined by winding a metal foil, so that the heat exchange efficiency can be improved.

Further, since a special device is not used for the joining operation, there is also an effect that the working place is not limited.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a refrigerator for a refrigerator according to the present invention will be described below with reference to the drawings. In addition, about the same structure as a conventional one, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

(Embodiment 1) FIG. 1 is a refrigerant circuit diagram of a refrigerator for a refrigerator according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view taken along the line AA of the heat exchange part of the refrigerator of the refrigerator according to the first embodiment of the present invention.

First, the high-temperature and high-pressure refrigerant leaving the compressor 1 is:
In the gas state, heat is radiated by the condenser 2, passes through a decompressor 8 provided with a flat surface portion on the outer surface, and becomes a liquid state, evaporates in the evaporator 4, and becomes gas again. The heat of vaporization at this time is absorbed from the periphery of the evaporator 4 and becomes cold air, so that the inside of the refrigerator is not shown (not shown).
Is cooled. Further, the vaporized refrigerant returns to the compressor 1 through the refrigerant return pipe 9 having a flat surface portion on the outer surface, and repeats the above cycle.

In FIG. 1, a decompressor 8 having a flat portion on its outer surface is joined to a pressure reducing device 8 having a flat portion on its outer surface and a refrigerant return pipe 9 having a flat portion on its outer surface for heat exchange. 8 promotes the liquefaction of the refrigerant, and promotes the vaporization of the surplus refrigerant in the refrigerant return pipe 9 provided with a flat portion on the outer surface.

In this embodiment, since the pressure reducing device 8 having a flat surface portion on the outer surface and the refrigerant return pipe 9 having the flat surface portion on the outer surface are joined, lead, which is a conventional solder component, can be eliminated. .

(Embodiment 2) FIG. 3 is a refrigerant circuit diagram of a refrigerator for a refrigerator according to Embodiment 2 of the present invention.

FIG. 4 is a sectional view taken along line BB of the heat exchange unit of the refrigerator of the refrigerator according to the second embodiment of the present invention.

First, the high-temperature and high-pressure refrigerant leaving the compressor 1 is:
In the gas state, the heat is radiated by the condenser 2, passes through a decompressor 10 having a flat surface portion on the outer surface except for a predetermined length at both ends, and becomes a liquid state, and is evaporated by the evaporator 4 to become a gas again. The heat of vaporization at this time is absorbed from the periphery of the evaporator 4 and becomes cool air, so that the interior of the refrigerator (not shown) is cooled. Further, the vaporized refrigerant returns to the compressor 1 through the refrigerant return pipe 11 provided with a flat portion on the outer surface excluding a predetermined length at both ends, and repeats the above cycle.

In FIG. 3, a decompressor 10 provided with a flat portion on the outer surface excluding a predetermined length at both ends and a refrigerant return pipe 11 provided with a flat portion on the outer surface excluding a predetermined length at both ends are joined to exchange heat. Thereby, the liquefaction of the refrigerant is promoted by the decompressor 10 provided with a flat portion on the outer surface excluding a predetermined length at both ends, and excess refrigerant in the refrigerant return pipe 11 provided with a flat portion on the outer surface excluding the predetermined length at both ends is promoted. Promotes vaporization.

Both ends of the pressure reducer 10 and the refrigerant return pipe 11 are circular. Thereby, the pipe connection workability between the condenser 2 upstream of the pressure reducer 10 and the evaporator 4 downstream of the pressure reducer 10 on the refrigerant circulation path is improved. This is because the circular cross section of the pipe eliminates the directionality at the time of insertion. Similarly, the pipe connection workability between the evaporator 4 upstream of the refrigerant return pipe 11 and the compressor 1 downstream is also improved.

In our experiments, a section having a predetermined length of 20 mm and a circular section was provided, but similar effects can be obtained with other dimensions under processing conditions. In this embodiment, the decompressor 10 having a flat portion on the outer surface excluding the predetermined length at both ends and the refrigerant return pipe 11 having the flat portion on the outer surface excluding the predetermined length at both ends are joined together. Some lead can be abolished.

(Embodiment 3) FIG. 5 is a refrigerant circuit diagram of a refrigerator for a refrigerator according to Embodiment 3 of the present invention.

FIG. 6 is a cross-sectional view taken along the line CC of the heat exchange section of the refrigerator of the refrigerator according to the third embodiment of the present invention.

First, the high-temperature and high-pressure refrigerant leaving the compressor 1 is:
In the gas state, heat is radiated by the condenser 2, passes through a decompressor 8 provided with a flat surface portion on the outer surface, and becomes a liquid state, evaporates in the evaporator 4, and becomes gas again. The heat of vaporization at this time is absorbed from the periphery of the evaporator 4 and becomes cold air, so that the inside of the refrigerator is not shown (not shown).
Is cooled. Further, the vaporized refrigerant returns to the compressor 1 through the refrigerant return pipe 9 having a flat surface portion on the outer surface, and repeats the above cycle.

In FIG. 7, a decompressor 8 having a flat surface portion on the outer surface and a refrigerant return pipe 9 having a flat surface portion on the outer surface are joined by using a hot-melt adhesive 12 and heat exchange is performed. The liquefaction of the refrigerant is promoted by the decompressor 8 provided with a flat portion on the outside, and the vaporization of excess refrigerant in the refrigerant return pipe 9 provided with the flat portion on the outer surface is promoted.

In this embodiment, since the hot melt adhesive 12 is used for joining the pressure reducing device 8 having the flat surface portion to the refrigerant return pipe 9 having the flat surface portion on the outer surface, the conventional solder component is used. Some lead can be abolished.

Further, since the area of the joint is increased, there is also an effect of improving the heat exchange efficiency.

Further, the heat exchange efficiency can be improved by adding a good heat conductive material to the hot melt adhesive. In our experiments, carbon black was used as a good thermal conductive material, and the heat exchange efficiency was improved compared to conventional lead-containing solder.

The effect of the second embodiment can also be obtained by making the cross sections of both ends of the decompressor 8 having a flat portion on the outer surface and the refrigerant return pipe 9 having the flat portion on the outer surface circular. .

(Embodiment 4) FIG. 7 is a refrigerant circuit diagram of a refrigerator cooling device according to Embodiment 4 of the present invention.

FIG. 8 is a sectional view taken along the line DD of the heat exchange part of the refrigerator of the refrigerator according to the fourth embodiment of the present invention.

First, the high-temperature and high-pressure refrigerant leaving the compressor 1 is:
In the gas state, the heat is radiated by the condenser 2, passes through a decompressor 8 provided with a flat portion on the outer surface, and becomes a liquid state, evaporates in the evaporator 4, and turns into a gas again. The heat of vaporization at this time is absorbed from the periphery of the evaporator 4 and becomes cold air, so that the inside of the refrigerator is not shown (not shown).
Is cooled. The vaporized refrigerant returns to the compressor 1 through the refrigerant return pipe 9 having a flat surface portion on the outer surface, and repeats the above cycle.

In FIG. 9, a decompressor 8 having a flat surface portion on the outer surface and a refrigerant return pipe 9 having a flat surface portion on the outer surface are joined by ultrasonic welding 13 to perform heat exchange, so that the outer surface is formed. The liquefaction of the refrigerant is promoted by the decompressor 8 provided with the flat part, and the vaporization of the surplus refrigerant in the refrigerant return pipe 9 provided with the flat part on the outer surface is promoted.

In this embodiment, since the ultrasonic welding 13 is used for joining the decompressor 8 having the flat surface portion to the refrigerant return pipe 9 having the flat surface portion, the conventional solder component lead is used. Can be abolished.

Further, since the area of the joint is increased, there is also an effect of improving the heat exchange efficiency.

In the case of ultrasonic welding, each material is melted by ultrasonic vibration and joined together, and has the effect that no additional material such as an adhesive is required.

The effects of the second embodiment can be obtained by making the cross sections of predetermined lengths at both ends of the decompressor 8 having the flat surface on the outer surface and the refrigerant return pipe 9 having the flat surface on the outer surface circular. Can be

(Embodiment 5) FIG. 9 is a refrigerant circuit diagram of a refrigerator for a refrigerator according to Embodiment 5 of the present invention.

FIG. 10 is a sectional view taken along the line EE of the heat exchange section of the refrigerator of the refrigerator according to the fifth embodiment of the present invention.

First, the high-temperature and high-pressure refrigerant leaving the compressor 1
In the gas state, the heat is radiated by the condenser 2, passes through a decompressor 8 provided with a flat portion on the outer surface, and becomes a liquid state, evaporates in the evaporator 4, and turns into a gas again. The heat of vaporization at this time is absorbed from the periphery of the evaporator 4 and becomes cold air, so that the inside of the refrigerator is not shown (not shown).
Is cooled. Further, the vaporized refrigerant returns to the compressor 1 through the refrigerant return pipe 9 having a flat surface portion on the outer surface, and repeats the above cycle.

In FIG. 11, a pressure reducer 8 having a flat surface portion on the outer surface and a refrigerant return pipe 9 having a flat surface portion on the outer surface are wrapped and joined using a metal foil 14 and heat exchange is performed. The liquefaction of the refrigerant is promoted by the decompressor 8 provided with a flat portion on the outside, and the vaporization of excess refrigerant in the refrigerant return pipe 9 provided with the flat portion on the outer surface is promoted.

In our company, the metal foil 14 has a thickness of 30 to 1
A copper foil of 00 microns or an aluminum foil of 30 to 100 microns was applied. Copper foil has an advantage of good heat conduction. Aluminum foil has the advantage of being lightweight and inexpensive because it is mass-produced industrially in household foils and the like.

In any case, the same effect can be obtained even if one side of the metal foil 14 is subjected to adhesive processing in order to improve winding workability.

In this embodiment, since the metal foil 14 is used for joining the pressure reducing device 8 having the flat surface portion to the refrigerant return pipe 9 having the flat surface portion on the outer surface, lead which is a conventional solder component is used. Can be abolished.

Further, since the area of the joint is increased, there is also an effect of improving the heat exchange efficiency. In the case of wrapping metal foil, there is also an effect that no special device is required, so that a work place can be selected.

The same effect as in the second embodiment can be obtained by making the cross sections of the predetermined lengths at both ends of the decompressor 8 having the flat portion on the outer surface and the refrigerant return pipe 9 having the flat portion on the outer surface circular. Is also obtained.

[0060]

As described above, the first aspect of the present invention is based on the fact that a decompressor having an outer surface provided with a flat portion and a refrigerant return pipe having an outer surface provided with a flat portion are joined and subjected to heat exchange. ,
Lead in the cooling device can be eliminated.

According to a second aspect of the present invention, a pressure reducer having a flat portion on the outer surface excluding a predetermined length at both ends and a refrigerant return pipe having a flat portion on the outer surface excluding a predetermined length at both ends are joined. By exchanging heat, lead in the cooling device can be eliminated. In addition, the workability of the piping treatment can be improved.

According to a third aspect of the present invention, in addition to the first or second aspect, a refrigeration cycle comprising a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and piping connecting them. In the above, the decompressor and the refrigerant return pipe are arranged in parallel, and are joined with a hot melt adhesive. By exchanging heat, lead in the cooling device can be eliminated.

A fourth aspect of the present invention is a refrigeration cycle comprising a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and a pipe connecting them, in addition to the first or second aspect. In the above, the decompressor and the refrigerant return pipe are arranged in parallel and joined by ultrasonic welding, so that lead in the cooling device can be eliminated. Further, additional materials for joining can be eliminated.

A fifth aspect of the present invention is a refrigeration cycle comprising a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and a pipe connecting them, in addition to the first or second aspect of the present invention. In the above, the pressure reducer and the refrigerant return pipe are arranged in parallel, and are wound and joined with a metal foil, so that lead in the cooling device can be eliminated. In addition, a special device for joining is not required, thereby reducing man-hours and material costs.

[Brief description of the drawings]

FIG. 1 is a first embodiment of a refrigerator for a refrigerator according to the present invention.
Refrigerant circuit diagram

FIG. 2 is a first embodiment of a refrigerator for a refrigerator according to the present invention.
AA sectional view of the heat exchange section of FIG.

FIG. 3 is a second embodiment of a refrigerator for a refrigerator according to the present invention;
Refrigerant circuit diagram

FIG. 4 is a second embodiment of a refrigerator for a refrigerator according to the present invention.
BB sectional view of the heat exchange section of FIG.

FIG. 5 is a third embodiment of a refrigerator for a refrigerator according to the present invention.
Refrigerant circuit diagram

FIG. 6 is a third embodiment of a refrigerator for a refrigerator according to the present invention.
CC sectional view of the heat exchange section of FIG.

FIG. 7 is a fourth embodiment of a refrigerator for a refrigerator according to the present invention.
Refrigerant circuit diagram

FIG. 8 is a fourth embodiment of a refrigerator for a refrigerator according to the present invention.
DD sectional view of the heat exchange section of FIG.

FIG. 9 is a fifth embodiment of a refrigerator for a refrigerator according to the present invention.
Refrigerant circuit diagram

FIG. 10 is a sectional view taken along the line EE of the heat exchange unit of the refrigerator according to the fifth embodiment of the present invention.

FIG. 11 is a refrigerant circuit diagram of a conventional refrigerator cooling device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 compressor 2 condenser 4 evaporator 6 piping 8 pressure reducer 9 refrigerant return pipe 10 pressure reducer 11 refrigerant return pipe 12 hot melt adhesive 13 ultrasonic welding 14 metal foil

Claims (5)

[Claims] 1. In a refrigeration cycle including a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and a pipe connecting them, the decompressor and the refrigerant return pipe are arranged in parallel,
A refrigerator for a refrigerator, wherein a flat portion is provided on each outer surface and joined. 2. In a refrigeration cycle comprising a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and a pipe connecting them, the decompressor and the refrigerant return pipe are arranged in parallel, and predetermined ends of respective ends thereof are provided. A cooling device for a refrigerator, wherein a flat portion is provided on an outer surface excluding a length and joined. 3. In a refrigeration cycle comprising a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and a pipe connecting them, the decompressor and the refrigerant return pipe are arranged in parallel, and a hot melt adhesive is used. The refrigerator cooling device according to claim 1, wherein the cooling device is joined. 4. In a refrigeration cycle comprising a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and a pipe connecting them, the decompressor and the refrigerant return pipe are arranged in parallel and joined by ultrasonic welding. The refrigerator for a refrigerator according to claim 1 or 2. 5. A refrigeration cycle comprising a compressor, a condenser, a decompressor, an evaporator, a refrigerant return pipe, and a pipe connecting them, wherein the decompressor and the refrigerant return pipe are arranged in parallel and wound with metal foil. 3. The refrigerator according to claim 1, wherein the refrigerator is joined.