JPH0361113B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an electric damper control device for a refrigerator, etc., which forcibly circulates cold air from a cooler through a circulation passage and guides cold air into the refrigerator via an electric damper. It is something.

[Prior art]

Conventionally, a thermo-type damper has been used as a means of regulating the internal temperature of a refrigerator, and a diaphragm expands or contracts depending on the pressure change of the gas inside the heat-sensitive tube, which opens and closes the buffer to control the cold air. In most cases, if the buttful portion of the damper becomes frozen, it is extremely difficult to open or close it with more force. Of course, the area around the damper is covered from the outside with styrofoam or resin, and structural considerations are taken to prevent heat from adhering to the inside of the refrigerator.
When changing the temperature range of one room (setting to frozen, partial, chilled, etc.), it was difficult to consider the structure to prevent freezing. Further, even when an electric damper is used instead of a thermo-type damper, the same drawbacks occur.

〔the purpose〕

The present invention allows the electric damper to “open” or “close”.
If this state continues for a certain period of time or more, this is detected by the detection means, and the buffle of the electric damper is reciprocated at least once by the drive means to prevent the damper buffle portion from being opened or closed due to freezing. This is intended to prevent this.

〔Example〕

Reference numeral 11 designates an insulating box body in which a foamed heat insulating material 14 is filled between an inner box 12 and an outer box 13, and the inside thereof is divided into three upper and lower chambers by two heat insulating partition walls 15 and 16, and a freezer compartment is opened from above. 17, a switching room 18, and a refrigerating room 19.

Reference numeral 20 denotes a cooler buried inside the upper heat insulating partition wall 15, and a blower fan 21 placed behind it is driven to send cold air from the cooler 20 through cold air ducts 22 and 23 to the freezer compartment 17. , the switching chamber 18 and the refrigerating chamber 19.

That is, the cold air guided by the cold air duct 22 is discharged into the freezer compartment 17 from the first outlet 24, cools the inside of the freezer compartment 17, and then returns to the cooler 20 side through the first suction port 25. It's summery.

Further, a part of the cold air guided by the cold air duct 23 is discharged into the switching chamber 18 from the second blow-off port 26, and after cooling the inside of the switching chamber 18, it is discharged from the second suction port 2.
7, the remaining cold air is discharged into the refrigerator compartment 19 from the third outlet 32, and after cooling the refrigerator compartment 19, it is returned to the cooler 20 side through a cold air return duct (not shown). They are starting to return.

28 and 29 are the second outlet 26 and the third outlet 2
It is a damper device for opening and closing 8, and is made up of buffers 28a, 29a and motors 28b, 29b, and is controlled to open and close by temperature sensing elements 30, 31 that detect the temperatures in the switching chamber 18 and the refrigerator compartment 19, respectively. It is becoming more and more common.

Figure 2 is an electrical circuit diagram of the main parts of the device of the present invention, and is 33
is a 1-chip microcomputer (hereinafter referred to as microcomputer), which contains ROM, RAM,
Equipped with a central processing unit. 34 is a reference clock oscillation circuit, and 35 is an A/C circuit that converts the analog signals from the temperature sensing elements 30 and 36 into digital signals.
It is a D converter. The temperature sensing element 36 is a temperature sensor inside the freezing chamber for controlling the compressor 37. Further, the electric damper 28 has a temperature sensing element 30.
The electric damper 28 is opened and closed in response to a signal from the electric damper 28 to adjust the amount of cold air flowing into the switching chamber 18, and the open and closed states of the electric damper 28 are detected by a switch 38. There is.

Then, the electric damper 28 remains in the "open" state or the "closed" state for a certain period of time t (in this embodiment,
After 12 minutes (this time is counted by the interval timer shown in the flowchart in Figure 4), the electric damper 28 is moved back and forth once.
In other words, if it is in the "open" state, it will be "closed" and then "open" again.
The process of returning to the original state is repeated. The above operation is shown in the operation explanatory diagram of FIG.

〔effect〕

The present invention provides a temperature detecting means for detecting the temperature inside the refrigerator as described above, and an electric damper that is controlled to open and close by the temperature detecting means and that adjusts cold air from the cooler. a switch that detects the open or closed state of the electric damper; a detection means that detects whether the electric damper continues to be in the open or closed state for a certain period of time; Since the electric damper is equipped with a drive means that reciprocates the bump of the electric damper at least once when the same state continues for a certain period of time, it is possible to prevent the damper bump from freezing due to opening and closing of a door in a humid atmosphere. This has the remarkable effect of being able to eliminate the inconvenience caused by the inability to open and close the damper.

[Brief explanation of drawings]

Figure 1 is a side sectional view of a refrigerator-freezer equipped with the device of the present invention, Figure 2 is an electrical circuit diagram of the main parts of the device of the present invention,
FIG. 3 is an explanatory diagram of the operation of the device of the present invention, and FIG. 4 is a flowchart of the device of the present invention. 20: Cooler, 28: Electric damper, 30: Temperature sensing element, 38: Switch.

Claims (1)

[Claims] 1. In a device equipped with a temperature detection means for detecting the temperature inside the refrigerator and an electric damper that is controlled to open and close by the temperature detection means and that adjusts the cold air from the cooler, the open and closed states of the electric damper can be controlled. The switch to detect and the electric damper are “open” or “closed”
detecting means for detecting whether the state continues for a certain period of time or more; and the detecting means causes the electric damper to reciprocate at least once when the electric damper continues in the same state for a certain period of time or more. An electric damper control device for a refrigerator, etc., characterized by comprising a driving means.