JPS6337660Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to a refrigerator in which a heat exchanger using a thermosiphon is installed in the freezing chamber, and in particular a structure for improving the cooling performance of the heat exchanger. It provides:

"Prior Art" Conventionally, in a refrigerator in which a heat exchanger using a thermosiphon is installed in the freezer compartment, a thermosensor tube connected to a thermostat that controls the temperature in the freezer compartment is used to measure the temperature inside the freezer compartment. It is used only to detect the temperature and is generally placed at the back of the corner of the freezer compartment.

``Problem that the invention attempts to solve'' However, in the above structure, if a refrigeration load is placed on the heat exchanger to perform rapid freezing, the thermostat in the freezer compartment will not be activated regardless of the presence or absence of this refrigeration load. Therefore, since the temperature is controlled, there is no problem if the compressor and blower fan are operated continuously during rapid freezing, but if they are operated intermittently,
As a result, the cooling in the heat exchanger is also interrupted, and the cooling effect in the heat exchanger is interrupted by the interruption, which has the disadvantage that the cooling effect of the heat exchanger cannot be fully exerted. had.

"Means for Solving the Problems" The present invention was developed in view of the above-mentioned drawbacks of the conventional technology. A temperature-sensitive tube connected to the thermostat that performs this function is placed close to the thermostat, and when the heat exchanger is not operating, it directly detects the temperature in the freezer compartment to open and close the thermostat, and when the heat exchanger is operating, it detects the temperature in the vertical section. The thermostat is closed and the compressor and blower fan are operated continuously to continue the cooling action in the heat exchanger and to ensure that the temperature in the vertical section is maintained no matter where the refrigeration load is placed on the horizontal section. It is designed so that it can be detected.

``Example'' The present invention will be explained with reference to an example shown in the figure below. Reference numeral 1 is a heat insulating box of a refrigerator, and the box 1 has a freezing compartment 2 in its upper part and a refrigerating compartment 3 in its lower part. A cooler 4 is provided at the rear of the freezer compartment 2, a partition wall 5 is provided at the front thereof, and a fan 7 is provided facing a cold air outlet 6 formed at the top of the partition wall 5. . Further, a heat exchanger 8 using a thermosiphon for rapid freezing is provided in the freezer compartment 2. The heat exchanger 8 is made by rolling and welding two metal plates with excellent heat conductivity, such as aluminum and copper, and bending them into a substantially L shape to form a horizontal part 81 and a vertical part 82. A refrigerant flow path is formed between the metal plates by expansion molding, and a fluorocarbon-based refrigerant is sealed within the flow path. A temperature sensing cylinder 9 for detecting the temperature inside the freezing compartment 2 connected to a thermostat for controlling the temperature of the freezing compartment 2 is disposed close to the vertical part 82 on the heat radiation side of the heat exchanger 8 over almost its entire width. ing.

"Function" and "Effect of the Idea" With the above-described configuration, the air cooled through the cooler 4 is blown out into the freezer compartment 2 through the cold air outlet 6 by the fan 7. In this operation, the temperature inside the freezer compartment 2 is detected by the temperature sensing tube 9 and controlled by opening and closing the thermostat 9 connected thereto. Therefore, when the object A to be cooled is placed on the heat exchanger 8, the horizontal part 81 and the vertical part 8
2, the refrigerant in the horizontal part 81 absorbs the heat of the object to be cooled A and evaporates, moves to the vertical part 82, where it is cooled by the cold air blown out and becomes a liquid, and due to its gravity it evaporates again. It is returned to the horizontal part 81 side,
Thereafter, this operation is repeated until there is no difference in temperature between the horizontal portion 81 and the vertical portion 82. As a result, heat exchange occurs between the object A to be cooled and the refrigerant, and the object A to be cooled is rapidly cooled by the cold air. When there is an object to be cooled A, that is, a refrigeration load, on the heat exchanger 8,
Until this completes freezing, the temperature of the vertical section 82 is higher than the temperature inside the freezing compartment 2 due to the condensation of the refrigerant, so the thermosensor tube 9 is affected by that temperature (substantially Even if the temperature inside the freezer compartment 2 is the set temperature of the thermostat, the thermostat will not operate and the compressor (not shown) and The blower fan 7 is in continuous operation, the cold air supply from the cold air outlet 6 is continued without being stopped, and the cooling in the heat exchanger 8 is continued. When cooling of the object to be cooled A is completed, the refrigerant no longer circulates in the heat exchanger 8 and there is no condensation of the refrigerant in the vertical section 82, so the temperature of the vertical section 82 becomes approximately the same as the temperature inside the freezer compartment 2. The temperature sensing tube 9 is not affected by the temperature of the vertical portion 82, and directly detects the temperature inside the freezing chamber 2 to perform normal temperature control.

As described above, the temperature sensing cylinder 9 for detecting the temperature inside the freezing compartment 2 is arranged close to the vertical part 82 which is the heat radiation side of the heat exchanger 8 facing the cold air outlet 6, and the heat exchanger The temperature change in the vertical portion 82 caused by the activation and inactivation of the heat exchanger 2 is detected by the temperature sensing tube 9, and when the heat exchanger 2 is inactive, the temperature inside the freezer compartment 2 is detected and the thermostat is activated. During operation, the temperature of the vertical section 82 is detected and the thermostat is closed regardless of the temperature inside the freezer compartment 2, the compressor and the blower fan 7 are operated continuously, and the cooling action by the heat exchanger 8 is continued. Therefore, the cooling action of the heat exchanger 8 is not interrupted during rapid freezing unlike in the conventional case, and the performance of the heat exchanger 8 can be fully demonstrated. In addition, since the temperature sensing tube 9 is arranged close to the vertical portion 82 of the heat exchanger 8 over almost the entire width thereof, the object to be cooled A can be reliably placed at any position on the horizontal portion 81 of the heat exchanger 8. The temperature of the vertical portion 82 can be detected, and the operation can be performed more reliably.

[Brief explanation of the drawing]

FIG. 1 is a cutaway side view of the main parts of a refrigerator showing an embodiment of the present invention, and FIG. 2 is a cutaway plan view of the main parts on the freezer compartment side. In the figure, 2 is a freezer compartment, 4 is a cooler, 6 is a cold air outlet, 7 is a fan, 8 is a heat exchanger, 81 is a horizontal part, 82 is a vertical part, 9 is a temperature sensing tube, and A is a cooled object. It is a thing.

Claims (1)

[Scope of utility model registration request] In a refrigerator in which a heat exchanger using a thermosiphon is installed in the freezer compartment, a thermosensor is used to detect the temperature inside the freezer compartment over almost the entire width of the vertical part of the heat exchanger facing the cold air outlet, which is the heat radiation side. A refrigerator characterized by cylinders arranged closely together.