JPS63318461A - Heating apparatus for refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention prevents the temperature of a compartment in a refrigerator that should not be lowered below a certain temperature from becoming lower than necessary and maintains the temperature at a desired temperature when the outside temperature is low. The present invention relates to a heating device for heating.

[Conventional technology 1] Some household refrigerator-freezers are divided into compartments such as a freezer compartment, a chilled room, a cold storage compartment, a refrigerator compartment, a butter case, and a vegetable storage. temperature must be maintained. This temperature usually ranges from around -20°C to several degrees Celsius depending on the compartment.

On the other hand, the refrigerator of 11'IJJ is equipped with only one refrigerator and cooling device, and it is arranged to cool the freezer compartment that requires the lowest temperature, and the other compartments are The desired temperature of each compartment is maintained by means such as directing cool air through the compartments or natural heat transfer.

However, when the outside temperature is relatively low, the compartment in which you want to maintain the desired temperature inside the refrigerator (hereinafter referred to as the "desired temperature compartment")
There is little heat intrusion from the outside air into the desired temperature zone, and conversely, heat is transferred from this desired temperature zone to the outside air or other temperature zones lower than this desired temperature (hereinafter referred to as "low temperature zone"), causing the temperature of the desired temperature zone to decrease. There was a gap where the temperature was lower than the desired temperature for this section.

Therefore, in order to prevent a desired temperature section within a refrigerator from becoming too low, there have been attempts to heat that section when the outside air temperature is low to maintain the upper limit at a desired temperature.

FIG. 6 is an electric circuit diagram of a conventional refrigerator heating device disclosed in, for example, Japanese Patent Publication No. 61-153363.

In the figure, 1 is a temperature control device, 2 is a compressor motor that compresses the refrigerant of the cooling device, and 20 is a power source. 4 is a heater, which is arranged to heat a desired temperature section. Reference numeral 10 denotes an outside air temperature detection device, which detects the temperature outside the refrigerator and turns on when the temperature is below a predetermined temperature lower than the desired temperature, and energizes the heater 4 to heat that compartment. 11 is an optional heater, 12
is an optional outside temperature sensing device.

When the outside air temperature is very low, the optional outside air temperature detection device 12 turns on, energizes the optional shutter 11, generates heat together with the heater 4, and raises the temperature that has become lower than the desired temperature of that compartment. .

Next, the operation will be explained. The electric power supplied from the power supply 1Q20 is turned on and off by the temperature control device 1, and the cooling operation of the fan motor 2 and compressor 3 of the cooling device is controlled. operates to maintain a constant temperature. Therefore, when the outside air temperature is low, the temperature in the desired temperature section may become too low as described above. Therefore, the outside air temperature detection device WtlO detects the temperature of the environment where the refrigerator is placed. ! !
degree, and if the temperature is below a predetermined temperature, the outside air temperature detection device 10 turns on, energizes the heater 4, raises the temperature of the desired temperature section in which the heater 4 is installed, and temperature is maintained.

In a refrigerator equipped with a heater 11 and an outside air temperature detection device 12 as options, when the outside air temperature becomes even lower, the outside air temperature sensing device 12 is turned on at a predetermined temperature, the heater 11 is energized, and together with the heater 4 it is heated even more strongly. [Problems to be Solved by the Invention] Since the conventional refrigerator heating device is configured as described above, the temperature in the desired temperature section is prevented from dropping too low. The temperature in the desired temperature zone can be raised, but its temperature characteristics are as shown in Figure 5. At the outside temperature where the heater turns on and off, at point A, where the heater is off, and at point 0, the temperature rises to the desired temperature. Point B where the temperature inside the refrigerator is lower than the temperature and the heater is on, and then point D
There is a problem in that the temperature inside the refrigerator becomes high and there is a considerable difference between the temperature and the desired temperature.

This invention was made to solve the above-mentioned problems, and provides a refrigerator that heats up according to the outside temperature when the outside air temperature is low, and stabilizes the temperature of the desired temperature section without deviating much from the desired temperature. The purpose is to obtain a heating device for.

[Means for solving the interpolation point problem] The heating device for a refrigerator according to the present invention includes a heating adjustment device that continuously changes the amount of heating depending on the outside temperature.

[Operation] The heating device for a refrigerator according to the present invention is equipped with a heating adjustment means that continuously changes the amount of heating according to the outside air temperature. A large difference in temperature does not occur, and the temperature can always be stably maintained near the desired temperature.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

1 to 4 show a heating device for a refrigerator according to an embodiment of the present invention, in which FIG. 1 is an electric circuit diagram, FIG. 2A, and FIG.
Fig. B is a waveform diagram of a heating current to explain the operation of the electric circuit shown in Fig. 1, Fig. 3 is a side sectional view of the refrigerator, and Fig. 4 is a line section showing the temperature inside the refrigerator.

In FIG. 1, 1 is a temperature control device, 2 is a fan motor of a cooling device, 3 is a compressor motor of a cooling device, and 13 is a sixth
A heater having a heating capacity equivalent to the sum of the normal heater and the optional heater 11 in the figure, 5 a triac that controls the current flowing to the heater 13, 6 a triac 5
7 is a thermistor that detects the outside temperature, and 20 is a power source.

In FIG. 3, this refrigerator has a freezer compartment 30 and a refrigerator compartment 40.
The upper part of the refrigerator compartment 40 is a mild refrigerator compartment 50.
are divided. The heater 13 is provided, for example, on the floorboard of the slow refrigerating compartment 50.

A thermistor 7 for detecting outside air temperature is provided outside the refrigerator at a location 1 in contact with the outside air, for example, on the top plate of the refrigerator.

The temperature control device 1 is turned on when the temperature inside the refrigerator rises, and power from the power source 20 is supplied to the fan motor 2 and the compressor 3 to enter cooling operation. When the temperature inside the refrigerator falls, the temperature control device 1 is turned off and the cooling operation is stopped. By repeating this process, the temperature inside the refrigerator is maintained at the set temperature. During the cooling operation, cold air is blown into the freezer compartment 30, so the freezer compartment 30 becomes the lowest temperature, and the cooling of the refrigerator compartment 40 is controlled and the freezing compartment 30 becomes the lowest temperature.
This temperature is higher than the temperature of 0, and the temperature of the slow refrigerating compartment 50 is maintained higher than that of the refrigerating compartment 40.

However, when the outside temperature drops, the slow cooling compartment 5 inside the refrigerator
0Furthermore, the temperature of the refrigerator room/lO, due to the above-mentioned reason,
If it becomes too low, it will cause a problem. Therefore, a heater 13 is provided in that compartment, and when the outside air temperature becomes low, electricity is applied to heat the compartment to maintain the internal temperature at a desired temperature.

Next, the heating control operation of this embodiment will be explained. In the first UA, the triac control board 6 learns the outside temperature from the detection signal from the thermistor 7 that detects the temperature outside the refrigerator. If the outside air temperature is below the set temperature -E, no pulse is sent from the control board 6 to the triac 5, the triac 5 is in an off state, and no current flows to the heater 13.

If the outside air temperature is below the set temperature F, which is lower than the desired temperature, f
A pulse is sent from the I11 control board 6 to the triac 5,
When this pulse enters the gate of the triac 5, the triac 5 becomes conductive and current flows through the heater 13. When the outside temperature detected by the thermistor 7 is not much lower than the set temperature, the width of the pulse sent from the control board 6 to the triac 7 is small, and as shown in FIG. 2B, the conduction angle is small and the triac 5 is Since the period of conduction is short, the total amount of current flowing through the heater 13 is small and the amount of heat generated is also small. When the outside temperature detected by the thermistor 7 is considerably lower than the set temperature, the width of the pulse sent from the control board 6 to the triac 5 increases, and as shown in FIG. 2A, the conduction angle increases and the triac 5 becomes conductive. The time spent in the heater 13 increases, the amount of current flowing through the heater 13 increases, and the amount of heat generated also increases.

Through such a heating control operation, the slow cooling chamber 50 is heated by a current that is adjusted to continuously change according to the outside air temperature flowing through the heater 13 having a heating capacity higher than that of the conventional one, as shown in FIG. As shown by the solid line in , even if the outside air temperature decreases, a substantially constant temperature close to the desired temperature is maintained. In addition,
Due to this influence, the refrigerator compartment 40 also maintains an appropriate temperature.

Although the description has been made regarding the use of a triac system as the heating adjustment means, there is also a means for driving an arm of a variable resistor based on a detected outside temperature signal to adjust the heating current so that it changes continuously.

[Effects of the Invention] - As described in L below, according to the present invention, the amount of electricity supplied to the heater, that is, the amount of heating, changes continuously according to the outside temperature, so it is possible to heat the refrigerator without excess or deficiency. The temperature can always be maintained at a temperature that does not deviate too much from the desired temperature.

[Brief explanation of the drawing]

6 to 4 show a heating device for a refrigerator according to an embodiment of the present invention, FIG. 1 is an electric circuit diagram, FIG. 2A,
Figure 2B is a current waveform diagram of the electric circuit shown in Figure 1, Figure 3 is a side sectional view of the refrigerator, Figure 4 is a diagram of the internal temperature, and Figure 5 is a diagram of the internal temperature.
The diagram shows the temperature inside the refrigerator according to the conventional example. FIG. 6 is an electric circuit diagram of the heating device according to the conventional example. In the figure, 4, 11, and 13 are heaters, 5 is a triac, 6 is a control board, and 7 is an outside temperature detection thermistor. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (2)

[Claims] (1) In a heating device for a refrigerator that is equipped with an outside air temperature detection means and a heater and that heats the heater by energizing it when the outside air temperature is low, the amount of heating is continuously changed according to the outside air temperature to increase the temperature inside the refrigerator. A heating device for a refrigerator characterized by being equipped with a heating adjustment means that suppresses changes. (2) The heating device for a refrigerator according to claim 1, wherein the heating adjustment means is a triac system that changes the energization angle to the heater depending on the outside air temperature.