JPS6113892Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a direct cooling type refrigerator in which the cooling surface of the wall surface of the freezer compartment is constituted by a cooler, and in particular, the frosting inside the freezer compartment is mainly made to form a specific cooling mural. Regarding refrigerators.

Conventionally, in direct-cooled refrigerators where the wall of the freezer compartment is made up of a cooler, when the door is opened, humid outside air enters the freezer compartment, causing frost to form on the entire inner surface of the freezer compartment, that is, the cooler. Are known.

For this reason, a defrost heater is attached to the cooler to defrost it, but when defrosting, it is necessary to remove the food from the freezer compartment to prevent adverse effects such as deterioration of the food due to heat or defrost water. be. Therefore, it has been difficult to perform periodic automatic defrosting by employing a timer method or the like.

The present invention was developed by focusing on the above-mentioned drawbacks, and is a refrigerator that can defrost the freezer compartment while food is still stored inside the refrigerator without raising the temperature of the food. Our goal is to provide the following.

An embodiment of the present invention will be described below with reference to the drawings. In Fig. 1, 1 is the refrigerator body, 2 is the freezer compartment, 3 is the refrigerator compartment, 4 is the vegetable compartment,
5, 6, and 7 are a freezer compartment door, a refrigerator compartment door, and a vegetable compartment door, respectively. Moreover, 8 is a condenser arranged on the back of the main body 1, and 9 is a compressor installed on the lower part of the back of the main body 1. In the freezer compartment 2, 10 is a first cooler for the freezer compartment that forms the bottom of the wall surface of the freezer compartment, 11 is a second cooler for the freezer compartment located at the rear part of the freezer compartment 2, and 12 is a cooler for the freezer compartment. This is a second condenser that is thermally connected to the second cooler 11 . On the other hand, in the refrigerator compartment 3, 13 is a refrigerator compartment cooler disposed at the rear of the upper part, and in the vegetable compartment 4, 14 is a vegetable compartment cooler disposed at the rear of the upper part.

Further, 15 is a dew receiving gutter for receiving defrosting water from the second cooler 11 provided at the rear of the bottom inside the freezer compartment 2;
Reference numeral 6 indicates a drain port penetrating from the bottom of the dew receiving gutter 15 to the refrigerator compartment 3 side, 17 indicates a dew receiving gutter provided at the rear of the refrigerator compartment cooler 13, and 18 indicates water received in the dew receiving gutter 17 to the vegetable compartment. Water pipe leading to side 4, 19 is vegetable compartment 4
This dew tray is installed at the inner bottom and receives and stores the defrosting water from the water pipe 18 to keep the inside of the vegetable compartment 4 at high humidity.

The compressor 9, condenser 8, crisper cooler 14, refrigerator cooler 13, first freezer cooler 10, second freezer cooler 11, and second condenser 12 are shown in FIG. A refrigeration cycle is configured with piping connections as shown in the figure. In addition, in this refrigeration cycle, 20, 21, 22, 23 are the first, second, third, fourth capillary tubes, 2
4, 25, and 26 are first, second, and third electromagnetic on-off valves.

Next, in the refrigerator configured as described above, the electric circuit for operating the compressor 9 and the electromagnetic on-off valves 24, 25, and 26 is configured as shown in FIG. That is, 27 is a temperature regulator for the freezer compartment for controlling the operation of the compressor 9, 28 is a heat-sensitive tube heater of the temperature regulator 27 for the freezer compartment, and 29 is a normally closed first
30 is a defrosting timer, and 31 is a defrosting switch operated by the timer 30.
A is a normally closed contact, and 31b is a switching contact that switches only for a predetermined time when the timer operates. And on this switching contact 31b side, there are second and third contacts connected in parallel.
The electromagnetic on-off valves 25 and 26 are connected, and the defrosting end detection switch 32 for the freezer compartment and the second cooler 11 is connected.
are connected in series. Note that 33 is an AC power source.

To explain the operation of the refrigerator with the above configuration, first, when the freezer compartment 2, refrigerator 3, and vegetable compartment 4 are all at a predetermined temperature or higher, and it is necessary to cool the three compartments, the temperature adjustment for the freezer compartment is performed. Since the container 27 is closed and the refrigerating room temperature regulator 29 is closed, the compressor 9 is operated and the first electromagnetic on-off valve 24 is opened. Also, the defrost switch 31 has a contact 31a.
2, the second and third electromagnetic on-off valves 25 and 26 are closed.

Therefore, the refrigerant discharged from the compressor 9 is transmitted through the condenser 8 → the first capillary tube 20 → the first electromagnetic on-off valve 24 → the vegetable compartment cooler 14 → the second capillary tube 21 → the refrigerator compartment cooling A refrigeration cycle is constructed in which the air is sent in the order of container 13 → first cooler 10 for the freezer → second cooler 11 for the freezer → compressor 9, and each cooler performs a cooling action, so each room is cooled. will be carried out. In this case, the evaporation temperature in each cooler is the highest in the vegetable compartment cooler 14 disposed on the upstream side, followed by the refrigerator compartment cooler 1.
3. The first cooler 10 for the freezer compartment and the second cooler 11 for the freezer compartment are lower in this order.

By carrying out the above operation, the vegetable compartment 4 and the refrigerator compartment 3 reach the predetermined cooling temperature first, the refrigerator compartment temperature regulator 29 opens, the first electromagnetic shut-off valve 24 closes, and the refrigerant is discharged. , the refrigeration cycle is switched from the first capillary tube 20 to the third capillary tube 22 → the second cooler 11 for the freezer compartment → the compressor 9, and the cooling action is performed only by the second cooler 11 for the freezer compartment. As a result, the freezer compartment 2 is cooled down.

Here, the cooling temperature of the second cooler 11 for the freezer compartment is set to be lower than the cooling temperature of the first cooler 10 for the freezer compartment, and when the above operation is repeated, the cooler in the freezer compartment 2 Frost buildup concentrates on the second cooler 11 where the temperature is low, and almost no frost forms on the first cooler 10 where the cooling temperature is relatively high. Also the first
Even if frost forms on the surface of the cooler 10, the frost transfers to the lower temperature second cooler 11 due to sublimation, so the freezer compartment 2 can be operated without frost forming on the items stored in the freezer compartment 2 or on the peripheral wall surface. Cooler available.

When the freezer compartment 2, refrigerator compartment 3, and vegetable compartment 4 are cooled to a predetermined temperature by the above operation, the freezer compartment temperature regulator 27 opens and the compressor 9 stops operating. At the same time, the heat-sensitive tube heater 28 of the temperature regulator 27 is energized to shorten the time required to return to operation and to prevent the temperatures in the refrigerator compartment 3 and vegetable compartment 4 from rising.

As explained above, the cooling operation in each room is performed by the temperature regulator 27 for the freezer compartment and the temperature regulator 29 for the refrigerator compartment.

Therefore, if the cooling control operation described above is performed for a long period of time, a certain amount of frost will adhere to the second cooler 11 of the freezer compartment. When the defrost timer 30 switches the defrost switch 31 to the contact point 31b, for example, once every 24 hours, the second electromagnetic on-off valve 25 and the third electromagnetic on-off valve 26 are energized and open, and the first Since the electromagnetic on-off valve 24 is closed without being energized, the high temperature refrigerant discharged from the compressor 9 is transferred to the third electromagnetic valve 25.
Since the heat is sent to the second condenser 12 via the second condenser 12 and radiated there, the frost adhering to the second cooler 11 of the freezer compartment, which is thermally conductive with the second condenser 12, is melted and defrosted. The refrigerant that has passed through the fourth capillary tube 23 is sent to the first cooler 10 for the freezer compartment, where it evaporates, and is then returned to the compressor 9 via the third electromagnetic on-off valve 26. Therefore, even when the second freezer cooler 11 is being defrosted, the first freezer cooler 11 is in the freezer compartment 2.
Since the cooling effect is performed by the cooler 10, the temperature does not rise. The defrosting water dissolved by the above defrosting operation falls into the dew receiving gutter 15, is sent to the dew receiving gutter 17 in the refrigerator compartment 3 via the drain port 16, and further passes through the water guide pipe 18 to the vegetable compartment 4. The water is introduced into a dew tray 19 inside and stored therein.

When a predetermined defrosting time has elapsed, the defrosting completion detection switch 32 detects the temperature, opens its contacts, turns off the power to the first and second electromagnetic on-off valves 25 and 26, and closes the valves as described above. The system returns to the refrigeration cycle for cooling and performs normal cooling control operation in each room. In addition, in the above-mentioned Example, although the refrigerator which has a vegetable compartment was demonstrated, it is not limited to this and may be a refrigerator which does not have a vegetable compartment.

Since the present invention has the configuration described above, it is possible to cool the freezer compartment, refrigerator compartment, and vegetable compartment independently, and the freezer compartment is cooled by two coolers with different cooling temperatures. Concentrates frost mainly on the cooler side,
By defrosting only this cooler, defrosting can be done without taking out the food in the freezer compartment, and even during defrosting, the other cooler is cooling the freezer compartment, which may cause the temperature of the food to rise. Therefore, it is possible to provide a refrigerator with great practical effects such as free storage.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view of the refrigerator according to the present invention;
The figure is a refrigeration cycle configuration diagram, and FIG. 3 is an electric circuit diagram. 1... Refrigerator body, 2... Freezer compartment, 3... Refrigerator compartment, 4... Vegetable compartment, 8... Condenser, 9... Compressor, 10... First cooler for freezer compartment, 11... Second cooler for freezer compartment, 12...Second condenser, 13...
Cooler for refrigerator compartment, 14... Cooler for vegetable compartment, 2
0, 21, 22, 23...1st, 2nd, 3rd, 4th capillary tube, 24, 25, 26...1st, 2nd, 3rd electromagnetic shut-off valve, 27...For freezing room Temperature controller, 29... Refrigerator room temperature controller, 30
... Defrost timer, 31 ... Defrost switch, 3
2... Defrost completion detection switch.

Claims (1)

[Scope of utility model registration request] A first cooler is disposed inside the freezer compartment and has an article placement surface, and this first cooler is independently disposed on the back side of the freezer compartment and has a lower evaporation temperature than the first cooler. A refrigerator comprising: a second cooler with a low temperature setting; and a condenser arranged in a heat exchange manner with the second cooler and configured to flow high-temperature refrigerant during defrosting operation. .