JPS626459Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improved configuration of a two-temperature refrigerator, and in particular prevents overcooling of the refrigerator compartment and improves the cooling efficiency of the freezing compartment.

In conventional refrigerators of this kind, in order to distribute refrigerant to the coolers provided in each of the freezing and refrigerating compartments, in many cases the refrigerant was first distributed to the refrigerating cooler and then to the freezing cooler. In such cases, when the outside temperature is low such as in winter, if the freezer compartment is not sufficiently cooled, the cooling operation continues, resulting in the refrigerator compartment being supercooled. In order to eliminate such adverse effects, the refrigerating compartment is heated with an electric heater to prevent the inside of the refrigerating compartment from becoming overcooled, but this is undesirable as it wastes a lot of power and increases the number of malfunctions. Therefore, it is conceivable to provide a bypass pipe that uses a solenoid valve to switch the flow to the refrigerator cooler, but such a solenoid valve is expensive and leads to a rise in manufacturing costs, which is not desirable.

In addition, some systems are used in which the refrigerant is distributed to the refrigerator cooler after passing through the freezer cooler, but when the outside temperature is low, once the freezer compartment is cooled to a predetermined temperature, the A large amount of liquid refrigerant that remained after being completely evaporated in the cooler flowed into the refrigerator cooler, tending to overcool the refrigerator compartment. After the refrigerant compressor was stopped, the liquid refrigerant in the refrigeration cooler naturally flowed down into the refrigeration cooler, again supercooling the refrigeration compartment.

This proposal was made in consideration of these points, and the figures will be explained below.

1 arranges a freezer box 2 and a refrigerated box 3 in an outer box 4,
The refrigerator main body is constructed by foam-filling a heat insulating material 5 between each of these boxes 2, 3, and 4, and the freezer box 2 and the refrigerator box 3 form a freezer compartment 6 and a refrigerator compartment 7, respectively. The front openings of both chambers 6 and 7 are connected to the door body 8,
9 are blocked. The freezer box 2 is made of a thermally conductive material such as an aluminum plate and shaped like a container with an opening on the front, and has a refrigerant passage formed therein or a refrigerant flow pipe attached to the outer circumferential surface. A refrigerating and cooling device 10 is provided. The refrigerator compartment 7 has a freezer cooler 10 and a main body 1 at appropriate places such as the upper part.
A refrigerant cooler 13 is provided, which forms a refrigerant cycle together with a refrigerant compressor 11, a condenser 12, etc., which are provided on the outer bottom and rear surface.

The refrigerant pressurized by the refrigerant compressor 11 flows sequentially to the condenser 12 - capillary tube 14 - refrigeration cooler 10 - refrigeration cooler 13 - accumulator 15, and returns to the refrigerant compressor via the suction pipe 16. A distribution cycle returns to 11.

The refrigerant flowing into the freezing cooler 10 from the capillary tube 14 flows through a portion provided in the freezing box 2, and flows from the freezing outlet 10A through the intermediate pipe body 17 to the refrigeration inlet 13A of the refrigeration cooler 13. . The refrigerant flowing into the refrigeration cooler 13 located below the refrigeration cooler 10 flows through the refrigeration cooler 1 which is bent into a meandering shape.
After the third circulation, the liquid rises from the refrigerating outlet 13B through the outlet pipe 18 and flows into the accumulator 15 disposed behind the refrigeration cooler 10.

The freezing outlet 10A side end of the freezing cooler 10 is sequentially bent downward along the back wall of the freezing box 2,
Further, the trap part 19 is bent upwardly to form a so-called trap part 19 having a substantially U-shape, and the terminal end of the trap part 19 is bent downward.
It is connected to the refrigeration inlet 13A of the refrigeration cooler 13.

The trap portion 19 may be provided only at the end of the freezing outlet 10A of the freezing cooler 10, or only on the intermediate pipe body 17.

Reference numeral 20 denotes a temperature controller that controls the operation of the refrigerant compressor 11, and its temperature sensing portion 20A is placed in a suitable position near the refrigerating inlet 13A of the refrigerating cooler 13 using a material with good thermal conductivity such as an aluminum plate. It is installed in a heat-sensitive manner via a fixing plate 21 and a supporting plate 22 made of material. The outlet pipe body 18 has its upper end near the accumulator 15 bent back into a substantially U-shape so as to protrude upwardly from the high end of the outflow side of the accumulator 15, which is arranged at an inclination, to prevent trap-shaped backflow. A prevention portion 23 is formed. The intermediate pipe body 17 and the outlet pipe body 18 are for communicating and connecting the freezing cooler 10 and the refrigerating cooler 13, which are formed separately, but they may be continuously integrated with both of these coolers 10, 13, or either one. It may be a formed one. In the case where both the coolers 10 and 13, the intermediate pipe body 17, and the outlet pipe body 18 are continuously integrally formed, both the coolers 1
Although the connection boundary with 0 and 13 is not clear, for convenience, the explanation has been given with separate numerals as described above, but it is not necessarily necessary to use separate numerals.

As described above, this proposal is based on a temperature controller that controls the operation of a refrigerant compressor in a two-temperature refrigerator configured to supply and distribute refrigerant to a refrigerant cooler and then to a refrigerant cooler. Since the temperature-sensing part is installed in a heat-sensitive manner in a position close to the refrigerator inlet of the refrigerator cooler, the freezer compartment can be cooled to a predetermined temperature in a short time, and the refrigerator compartment will not become overcooled. It becomes less.

Particularly during low outside temperatures such as winter, the refrigerant pressure on the high pressure side does not rise as much as when outside temperatures are high such as summer, so a large amount of refrigerant tends to accumulate in the condenser and circulate within the refrigerant cycle. The amount of refrigerant used will also be significantly reduced. As a result, most of the refrigerant sent from the refrigerant compressor through the capillary tube evaporates inside the refrigeration cooler, and immediately after the start of operation, the refrigerant in the so-called dry vapor state flows into the refrigeration cooler and leaves the refrigerator compartment. Doesn't do much to cool it down. When the temperature of the freezer compartment drops to a predetermined temperature as the operating time passes, the load on the freezer compartment decreases and the refrigerant that cannot be evaporated in the freezer cooler is gradually supplied to the refrigerator cooler and should be evaporated in the refrigerator cooler. The amount of refrigerant will increase. When the outside temperature is low, the refrigerator compartment does not need to be cooled significantly, but as mentioned above, the amount of refrigerant that must be evaporated by the refrigerator cooler increases, so there is a risk that the refrigerator compartment will become supercooled. The temperature-sensing part is installed near the inlet of the refrigerator cooler, and the refrigerant that has not been evaporated in the refrigerator cooler before the refrigerator compartment is completely cooled to a predetermined temperature.
In other words, since the temperature of the low-pressure liquid refrigerant is sensed and the operation of the refrigerant compressor is stopped, the evaporation power of the refrigerant in the refrigerator cooler is reduced, and as a result, overcooling of the refrigerator compartment can be prevented and temperature compensation can be performed. A heater or the like is not required, and liquid refrigerant can be prevented from returning to the refrigerant compressor.

[Brief explanation of the drawing]

FIG. 1 is a schematic vertical cross-sectional view of the refrigerator of the present invention, FIG. 2 is a schematic perspective view of the main parts thereof, FIG. 3 is an enlarged perspective view of the dotted circle A section in FIG. 2, and FIG. 4 is a diagram of the refrigerant cycle. 10... Refrigeration cooler, 13... Refrigeration cooler, 2
0...Temperature controller.

Claims (1)

[Scope of utility model registration request] A freezer compartment equipped with a freezer cooler and a refrigerator compartment equipped with a refrigerator cooler are formed above and below, and the refrigerant from the capillary tube of the refrigerant cycle first flows to the freezer cooler in the upper part and then to the refrigerator cooler in the lower part. Further, the temperature sensing part of the temperature controller for controlling the operation of the refrigerant compressor of the refrigerant cycle is located at a position close to the refrigerating inlet of the refrigerating cooler into which the refrigerant from the refrigerating cooler flows. A two-temperature refrigerator characterized by being installed in a heat-sensitive relationship with a refrigerating cooler.