JPH047505Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) This invention relates to a refrigerator with an improved internal temperature adjustment mechanism.

(Prior art) As a means for adjusting the internal temperature of a refrigerator, there is a means for adjusting the cold air outlet by opening and closing a damper mechanism, as shown in Utility Model Application No. 61-156873, for example. Referring to FIG. 3, reference numeral 1 denotes a cold air flow path, and this cold air flow path 1 communicates with a refrigerator compartment 2, which is the inside of the refrigerator, through a cold air outlet 3, and a damper 4 is connected to this cold air outlet 3. is provided. The damper 4 is attached to one end of an actuation lever 5, which is rotatably supported via a pin 6, and which is elastically biased clockwise by a spring 7, and this biasing force is applied to the damper 4. At this point, the damper 4 is closed to the cold air outlet 3. Reference numeral 8 denotes a drive device, and this drive device 8 is composed of a bellows 9 filled with a working fluid with a large thermal expansion such as Freon gas, and a heat-sensitive section 10 that communicates with the bellows 9 and detects the temperature inside the refrigerator compartment 2. is,
A heater 11 is wound around the heat sensitive part 10.

When the temperature inside the refrigerator compartment 2 rises, the heat sensing section 10 senses the temperature, the working fluid inside expands, and the bellows 9 expands accordingly. 7, the damper 4 is separated from the cold air outlet 3, the cold air outlet 3 is opened, and cold air flows into the refrigerator compartment 2 from the cold air passage 1. The temperature inside the refrigerator compartment 2 decreases. When the temperature inside the refrigerator compartment 2 falls to a certain temperature, the working fluid contracts and the bellows 9 contracts, and accordingly the operating lever 5 rotates clockwise by the biasing force of the spring 7, thereby discharging the cold air. The air outlet 3 is narrowed down. By repeating such operations, the temperature inside the refrigerator compartment 2 is maintained at the set temperature.

Here, when the heater 11 is energized, the heat sensitive part 10
is heated, the internal working fluid expands, and based on this, the cold air outlet 3 is opened wide and the refrigerator compartment 2 is heated.
A large amount of cold air flows into the refrigerator compartment 2, thereby further lowering the temperature inside the refrigerator compartment 2. When the temperature inside the refrigerator compartment 2 drops to a level that cancels out the amount of heat applied to the heat-sensitive part 10 by the heater 11, the working fluid contracts and the cold air outlet 3 is throttled.
The temperature inside is maintained at a set temperature lower than the set temperature. By changing the capacity of the heater 11, the temperature inside the refrigerator compartment 2 can be adjusted to another set temperature based on the correlation between the amount of heating to the heat-sensitive section 10 and the temperature inside the refrigerator compartment 2 detected by the heat-sensing section 10. Ru.

(Problem to be solved by the invention) However, in this way, the heat-sensitive section 10 works as a temperature sensor that detects the temperature inside the refrigerator compartment 2,
The temperature inside the refrigerator compartment 2 detected by this heat sensitive part 10,
If the temperature inside the refrigerator compartment 2 is maintained at the set temperature based on the correlation with the amount of heating to the heat-sensitive section 10 depending on the capacity of the heater 11, the working fluid expands according to the actual temperature inside the refrigerator compartment 2. The contraction operation is delayed, causing relatively large variations and differentials in the temperature inside the refrigerator compartment 2. Also, since the heat-sensing section 10 is used as a temperature sensor, the heat-sensing section 10 is
As a result, the heat sensitive part 10
There was a problem in that the heater 11 attached to the refrigerator compartment 2 was disposed in the refrigerator compartment 2, and the heat generated by the heater 11 decreased the cooling efficiency in the refrigerator compartment 2. This invention is aimed at solving these problems.

[Structure of the invention] (Means for solving the problem) In order to solve the above problem, this invention has a cold air outlet that allows cold air to flow into a refrigerator compartment or the like, and a cold air outlet that allows the cold air to flow into the refrigerator. A damper that opens and closes,
A working fluid is sealed in a bellows and a heat-sensitive section that communicates with the bellows, and a heater is provided in the heat-sensitive section, and the bellows is expanded and contracted by expansion and contraction of the working fluid under the control of the heater, thereby driving the damper to open and close. and a memory that outputs a signal of a set temperature for the inside of the refrigerator, a temperature sensor that detects the temperature inside the refrigerator, and these memories, while the heater and the heat-sensitive part are arranged in a part other than the inside of the refrigerator. and an operational amplifier to which the outputs of the temperature sensor are input, and the heater is controlled based on the output signal of the operational amplifier.

(Function) The temperature inside the refrigerator is detected by a temperature sensor, and the heater is controlled by a signal based on this detection.The working fluid in the heat sensitive section expands and contracts only under the condition of the heater's capacity change, and the cold air outlet opens and closes. be done.

(Example) An example of this invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows the overall structure of the refrigerator, and 21 is a main body, and the inside of this main body 21 is partitioned via a partition wall 22 into an upper freezing chamber 23 and a lower refrigerating chamber 24. A cooler chamber 2 is provided on the upper surface of the partition wall 21.
6 is formed, and a cooler 27 is installed in this cooler chamber 26.
A cold air passage 29 in which a blower fan 28 is housed, and this cooler chamber 26 is formed in the back of the main body 21.
is connected to. The cold air passage 29 extends vertically, and its upper end is connected to the freezer compartment 2 through the cold air outlet 30.
3, and the lower end side communicates with the refrigerator compartment 24 through the cold air outlet 31, whereby the cold air generated by the cooler 27 is passed through the cold air passage 29 by the blowing force of the ventilation fan 28 to the freezer compartment 23 and the refrigerator compartment. 24 respectively.

A damper mechanism including a damper 4, an operating lever 5, a pin 6, a spring 7, a bellows 9, a heat sensitive part 10, and a heater 11 is provided for the cold air outlet 31 in the refrigerator compartment 24, as in the case of FIG. It is being However, in this damper mechanism, the heat sensitive part 10 is disposed outside the refrigerator compartment 24, for example, in a recess 33 formed on the back surface of the main body 1. On the other hand, inside the refrigerator compartment 24, this refrigerator compartment 2
A temperature sensor 34 such as a thermistor is provided for detecting the temperature inside 4.

The electrical circuit is shown in FIG. 2, and 35 is a memory that outputs a signal of the set temperature for the refrigerator compartment 24 according to the user's operation. This memory 35 and the temperature sensor 34 are connected to an operational amplifier 36, and this An operational amplifier 36 is connected to the heater control circuit 37;
This heater control circuit 37 controls the heater 11 of the heat sensitive section 10.

In such a configuration, the signal of the set temperature outputted by the memory 35 and the signal of the temperature inside the refrigerator compartment 24 outputted by the temperature sensor 34 are sent to the operational amplifier 3.
6, and a signal based on both signals is input from the operational amplifier 36 to the heater control circuit 37, whereby the power of the heater 11 is controlled, its capacity is determined, and the heat sensitive section 10 is heated. As the heat sensitive section 10 is heated, the working fluid inside it expands, and based on this expansion, the cold air outlet 31 is opened wide, and a large amount of cold air flows into the refrigerator compartment 24.
As a result, the temperature inside the refrigerator compartment 24 decreases. This decrease in temperature is detected by the temperature sensor 34, and the signal is sent to the operational amplifier 36. Based on this, the power of the heater 11 is controlled. Through this control, the capacity of the heater 11 is changed, and the operation inside the heat sensitive section 10 is controlled. The fluid contracts and the cold air outlet 31 is throttled, and by repeating this, the temperature inside the refrigerator compartment 24 is maintained at the set temperature.

In this way, the temperature in the refrigerator compartment 24 is detected by the temperature sensor 34 to control the heater 11, and the working fluid in the heat sensitive part 10 is expanded and contracted only under the condition of the capacity change of the heater 11. , temperature variations and differentials in the refrigerator compartment 24 can be kept small. Since the heater 11 attached to the heat sensitive section 10 is provided outside the refrigerator compartment 24, the cooling efficiency within the refrigerator compartment 24 will not be reduced.

In addition, in the said Example, the case where the temperature in a refrigerator compartment is adjusted was mentioned as an example, but the case where the temperature in the freezing compartment which is the other compartment of a refrigerator is adjusted may be sufficient.

[Effects of the invention] As explained above, according to this invention, it is possible to suppress variations in temperature inside the refrigerator and differentials, and there is no reduction in the cooling efficiency inside the refrigerator. play.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of this invention, FIG. 2 is a block diagram of an electric circuit of the same embodiment, and FIG. 3 is a sectional view showing a conventional technique. 4... Damper, 8... Drive device, 9... Bellows, 10... Heat sensitive section, 11... Heater, 34...
...Temperature sensor, 35...Memory, 36...Operation amplifier.

Claims (1)

[Scope of utility model registration request] A working fluid is sealed in a cold air outlet that allows cold air to flow into the refrigerator, a damper that opens and closes the cold air outlet, a bellows, and a heat-sensitive part that communicates with the bellows.
The heat-sensitive section is provided with a heater, and a drive device that expands and contracts the bellows by expanding and contracting the working fluid under control of the heater to open and close the damper, and the heater and the heat-sensing section are moved into the refrigerator. It is equipped with a memory that outputs a signal of the set temperature for the inside of the refrigerator, a temperature sensor that detects the temperature inside the refrigerator, and an operational amplifier to which the outputs of these memories and temperature sensors are input. , A refrigerator characterized in that the heater is controlled based on an output signal of the operational amplifier.