KR930004407B1 - Refrigerator - Google Patents

Abstract

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Description

Refrigerator

1 is an electric circuit diagram showing a drive control circuit and a damper control circuit of a compressor and a fan drive motor.

2 is a schematic longitudinal side view of the entire refrigerator.

3 is a view showing a change in the operation of each part.

4 is a diagram showing the input / output operation of the exclusive OR circuit in the ON time zone T _ON .

5 is a diagram showing the characteristics of temperature change in the conventional specification.

* Explanation of symbols for main parts of the drawings

3: specification conversion room 5: cooler

6: fan 8: fan drive motor

10 damper device 11 damper plate

13 compressor 14 freezer temperature sensor

15: Drive control circuit of compressor and fan drive motor

23 damper control circuit 24 temperature sensor

25 switchover temperature detection circuit 31 oscillator

32: dedicated damper relay coil relay coil

36: freezer compartment specification start switch 38: chilled chamber specification start switch

40: refrigerator switch gas specifications

41: flip-flop circuit for freezer specification set / reset storage

42: flip-flop circuit for chilled seal specification set / reset storage

43: flip-flop circuit for refrigerating compartment specification set / reset storage

The present invention relates to a refrigerator having a specification switching room that can be selected and set in any of the freezer specification, the chilled specification and the refrigerating specification.

In a conventional refrigerator of this kind, the specification switching chamber is controlled to a temperature of a freezing chamber specification, a chilled chamber specification, and a refrigerating chamber specification by controlling the amount of cold air supplied to the specification switching chamber with a damper device.

In case of changing the specification to the freezer compartment, it is necessary to keep the inside of the conversion chamber at a considerably low temperature.However, when using the chilled chamber specification or the refrigerating compartment specification, it is not necessary to lower the temperature of the refrigerating compartment specification. When the damper device is opened and the chilled room specification or the refrigerating compartment specification is set, the damper device is opened and closed based on the temperature detection in the specification switching chamber by the detection temperature sensor.

However, the damper device in such a manner is driven by a motor, and in this type of damper device, it is usually developed or fully closed to control the amount of cold air supplied.

In this regard, when the chilled seal specification or the refrigerating compartment specification is set, the damper turns on when the damper ON temperature (the damper ON temperature of the chilled seal specification is slightly lower in the chilled seal specification and the refrigerating chamber specification) is detected based on the temperature sensor. The damper device is fully closed in the OFF time zone when the device is deployed and the OFF temperature is detected.

The opening angle of the damper device is set at a slightly larger opening angle so that a considerable low temperature can be obtained when the freezer specification is set. Therefore, when the chilled seal specification or the refrigerating compartment specification is set, the amount of cold air supplied per unit time in the ON time zone is large and average. Although the desired chilled seal specification temperature or the refrigeration specification specification temperature can be obtained, as shown in FIG. 5, the upper and lower widths of each chilled seal specification temperature and the refrigerating compartment specification temperature are large, in other words, the temperature change is large, so that the temperature control is delicately. There was a problem that can not.

This invention is made | formed in view of such a point, and the objective is to provide the refrigerator which can refine | define temperature control by narrowing the upper and lower width of each specification temperature in a chilled chamber specification and a refrigerator compartment specification.

The present invention detects the internal temperature of the specification switching chamber and the damper device which controls the amount of supply of cold air to the specification switching chamber by opening and closing the specification switching chamber to select and set one of the freezer specification, the chilled chamber specification and the refrigerating chamber specification. When the temperature sensor and the freezer specification are set, the above-mentioned damper device is opened. When the chilled chamber specification and the refrigerator compartment specification are set, the damper device is opened for a predetermined time in the ON time zone where the damper ON temperature is detected by the temperature sensor. And a damper control circuit which operates to alternately close and close the closing, and controls to close the damper device in the OFF time zone where the damper OFF temperature is detected.

When the freezer compartment specification is set, the damper device is opened regardless of the damper ON temperature or damper OFF temperature based on the temperature sensor, so that a large amount of cool air is supplied to the specification switching chamber so that the specification switching chamber is brought to the temperature of the freezer specification.

When the chilled seal specification or the refrigerating compartment specification is set, the damper device alternates between opening and closing in the ON time zone when the damper ON temperature is detected by the temperature sensor, and closes the damper device in the OFF time zone when the damper OFF temperature is detected. In addition, the specification temperature can be obtained, and since the cool air is not excessively supplied even in the ON time zone, the variation of each specification temperature in the OFF time zone and the ON time zone becomes smaller, thereby improving the accuracy of temperature control.

An embodiment of the present invention will now be described with reference to FIGS. 1 to 4.

First, in FIG. 2, "1" is a refrigerator main body, the inside of which forms a freezing chamber 2 in the upper portion, a specification switching chamber 3 in the middle portion, and a refrigerating chamber 4 in the lower portion.

"5" is a cooler, "6" is a fan, and these are installed behind the rear specification plate 2a of the freezer compartment 2, and the cooler 5 and the fan 6 are used to supply cold air to a cold air supply duct ( 7) is supplied to the freezing compartment (2), specification conversion chamber (3) and the refrigerating compartment (4).

&Quot; 8 " is a fan driving motor for driving the fan 6 described above.

"9" is a cold air outlet opening in the specification conversion room 3, "10" is a damper device for opening and closing the cold air outlet 9, the damper device 10 is a damper plate 11 and a damper motor (not shown) , A cam and drive mechanisms 12 for opening and closing the damper plate 11.

The damper device 10 sets the damper position detection signal S ₁₀ (see FIG. 1) to a low level when the damper plate 11 is in the closed position, and the damper position detection signal S when the damper plate 11 is in the open position. _{Set 10} to high level.

In addition, the damper motor described above is one-way rotation type when the damper plate 11 is driven in the closed position, so that the cam is operated in one direction rotation so that the damper plate 11 is opened and driven when the damper plate 11 is in the open position. Similarly, the cam closes the damper plate 11 due to the operation.

"13" is a compressor installed in the refrigeration cycle.

The compressor 13 and the fan drive motor 8 are driven and controlled by the temperature detection of the freezer compartment temperature sensor 14 (see FIG. 1) installed in the freezer compartment 2, and the "15" shown in FIG. Is the drive control circuit.

In this drive control circuit 15, "16" is a temperature detection circuit including the above-mentioned freezer temperature sensor 14, "17" is a reference voltage generator circuit, and "18" is positive feedback, resulting in a Schmidt trigger. The comparator 18 functions as a high level when the temperature detection value E ₁₆ and the temperature reference value E ₁₇ provided by the temperature detection circuit 16 and the reference voltage generation circuit _{17 are set} to high levels, respectively, and fall below the accelerating / decreasing temperature reference value. Sets the output signal S ₁₈ to low level.

&Quot; 19 " and " 20 " are transistors that are turned on and off in accordance with the output signal S _18. The transistors 19 and 20 are relay coils 21 and fan drive motors for compressor 13, respectively. ) Controls the disconnection of the relay coil 22 dedicated for disconnection.

Therefore, the operation of the refrigeration cycle driven by the compressor 13 and the refrigeration operation of the cold air circulation by the drive of the fan 6, as can be seen in the third (d) and the third (b) specification switching chambers ( Regardless of the specification form of 3), it is made according to the temperature of the freezing chamber 2.

23 denotes a damper control circuit which controls the damper motor of the damper device 10 according to the specification setting of the specification switching chamber 3, and will now be described.

"24" is a temperature sensor, which detects the internal temperature of the specification change room 3.

&Quot; 25 " is a switching chamber temperature detection circuit, which includes a temperature sensor 24, voltage divider resistors 26a and 26b, a transistor 27, a capacitor 23, and the like, and a transistor 27 Outputs the detected voltage when the OFF is turned to the chilled room specification temperature detection value E _C, and outputs the detected voltage when the transistor 27 is turned on to the refrigerating compartment specification temperature detection value E _r .

&Quot; 29 " is a reference voltage generating circuit provided with voltage divider 29a and 29b, which outputs the reference voltage as the temperature reference value E ₂₉ in the chilled chamber specification and the refrigerating chamber specification.

&Quot; 30 " is a comparator with a Schmitt trigger function due to a positive feedback, and the non-inverting input terminal (+) has a chilled room specification temperature detection value E _C or a refrigerating room specification temperature from the above-described switching room temperature detection circuit 25. The detection value E _r is given, and the temperature reference value E ₁₉ from the reference voltage generating circuit 29 is given to the inverting input terminal (−).

The comparator 30 is given an upper limit temperature reference value and a lower limit temperature reference value with respect to the above-described temperature reference value E ₂₉ by the Schmitt trigger function.

Therefore, when the internal temperature of the specification switching room 3 detected by the temperature sensor 24 of the switching room temperature detection circuit 25 exceeds the above-mentioned upper limit temperature reference value, that is, the damper ON temperature is detected. The output signal S ₃₀ is set at a high level. Similarly, when the internal temperature falls below the lower limit temperature reference value, that is, when the damper OFF temperature is detected, the output signal S ₃₀ is set at a low level.

&Quot; 31 " is a frequency variable oscillator, which outputs a frequency pulse P _f as shown in FIG.

"32" is a relay coil for energizing and damping the damper motor in the damper device 10, which is to be energized in accordance with the ON and OFF of the NPN transistor 33.

34 is a diode for protecting the transistor 33.

On the other hand, "35" is a freezer compartment specification set input circuit, which is composed of a freezer compartment specification start switch 36, which is composed of an automatic return type push switch, and the output signal S when the freezer start switch 36 is operated ON. Change ₃₅ to low level.

&Quot; 37 " is a chilled seal specification set input circuit, which is comprised of a chilled seal specification start switch 38, which is composed of an automatic return push switch, and when the chilled seal specification start switch 38 is operated to ON. The output signal S ₃₇ is changed to low level.

"39" is a refrigerating compartment specification set input circuit, which is comprised of a refrigerating compartment specification start switch 40, which is composed of an automatic return push switch, and when the refrigerating compartment specification start switch 40 is operated ON, the output signal S Change ₃₉ to low level.

&Quot; 41 " " " 42 " " 43 " is a D flip-flop circuit, the flip-flop circuit 41 is for a freezer specification set / reset storage, and the flip-flop circuit 42 is for a chilled thread specification set / reset storage, flip The flop circuit 43 is for a refrigerator compartment specification set reset memory.

Each of these flip-flop circuits 41, 42, 43 is set when the clock terminal CK changes from a low level to a high level when the clear terminal CLR is in a low level state to set the set output terminal Q to a level corresponding to the level of the data terminal D. When the clear terminal CLR changes to a high level, it is reset to change the set output terminal Q to low barrel.

"44" is a light emitting diode for freezer specification set display, "45" is a light emitting diode for chilled room specification set display, and "46" is a light emitting diode for refrigeration room specification set display.

&Quot; 47 " is a reset circuit composed of a resistor, a capacitor, and a diode, which resets each flip-flop circuit 41, 42, 43 by changing the output signal S ₄₇ from high level to low level when the power supply is cut off. It is for instantaneous power failure compensation.

The output terminal of the comparator 30 described above, each base of the transistors 27 and 33, the output terminal of the oscillator 31, each of the input circuits 35, 37, 39, and each flip-flop circuit 41. 42, 43, each of the light emitting diodes 44, 45, 46, and the reset circuit 47 include an AND circuit 48, an OR circuit 49, an exclusive OR circuit 50, and a three-input type. It is connected via AND circuits 51, 52 and 53 as shown in the figure.

At this time, one of the input terminals of the exclusive OR circuit 50 is provided with the damper position detection signal S ₁₀ from the damper device 10 described above.

In addition, since each of the input circuits 35, 37, 39 is connected to the clock terminal CK of the flip-flop circuits 41, 42, 43 and the clear terminal CLR as shown, each gas switch 36 ( When 38) 40 are sequentially turned on, the specification setting for the last started start switch becomes effective.

Referring to the operation of the above-described configuration as follows.

In the state shown in FIG. 1, the power is turned on, and the output signal S ₄₇ of the reset circuit ₄₇ is at a high level, and the output signals S ₃₅ , S ₃₇ , and S ₃₉ of each of the input circuits ₃₅ , ₃₇ , and ₃₉ are Suppose you are in a high level state.

Thus, each of the flip-flop circuits 41, 42, 43 is in a state where the clear terminal CLR is in a low level but each reset is released.

For example, when the freezer compartment specification gas switch 36 is operated to select the freezer compartment specification, the output signal S ₃₅ from the freezer compartment specification set input circuit ₃₅ is converted to the low level.

As a result, the clock terminal CK of the freezer compartment set-reset storage flip-flop circuit 41 is changed from low level to high level, while the other flip-flop circuits 42 and 43 have AND circuits 52 and 53, respectively. It becomes a high level with respect to the ON operation time of the freezer specification start switch 36 via (restored to a low level when ON operation is cancelled).

가 저레벨로 변화한다.As the clock terminal CK of the flip-flop circuit 41 changes from low level to high level, the flip-flop circuit 41 is set so that the set output terminal Q changes to high level according to the level of the data terminal D (in this case, high level). Reset output terminal

Changes to the low level.

As a result, the OR circuit 49 to which the light emitting diode 44 for displaying the freezer specification set is energized and turned on, and to which a signal from the set output terminal Q of the flip-flop circuit 41 is applied, has a high level regardless of other inputs. Output the signal.

Therefore, the other input terminal of the exclusive OR circuit 50 is always at a high level.

At this time, one input terminal of the exclusive OR circuit 50 is provided with a damper position detection signal S ₁₀ from the damper device 10. When the damper plate 11 is closed, the signal S ₁₀ is low level, so the exclusive OR circuit ₅₀ is provided. The output of the 50 is at a high level so that the transistor 33 is turned on so that the relay coil 32, that is, the damper motor, is energized to open the damper plate 11 and the damper plate 11 reaches the open position. Since the position detection signal S ₁₀ becomes a high level, the output of the exclusive OR circuit 50 becomes a low level, the damper motor is disconnected, and the damper plate 11 is maintained in the open position.

In addition, when the damper plate 11 is in the open state, since the damper position detection signal S ₁₀ is at a high level, the output of the exclusive OR circuit 50 is at a low level, and the damper motor is not driven, so that the damper plate 11 is kept in the open position.

Therefore, when setting the freezer compartment specification, the damper device 10 is always open so that a large amount of cool air is supplied into the specification change chamber 3.

At this time, as mentioned in FIG. 2 (a) and FIG. 2 (b), since the refrigeration cycle and the fan 6 are operated and controlled according to the temperature of the freezer compartment 2, the cool air is supplied according to the operation.

Next, when the chilled seal specification is selected by setting the chilled seal specification gas switch 33 to ON, the output signal S ₃₇ of the chilled seal specification set input circuit 37 changes to a low level, thereby clocking the flip-flop circuit 42. This flip-flop circuit 42 is set as the terminal CK changes from a low level to a high level, and is reset as the clear terminal CLR of the other flip-flop circuits 41 and 43 changes to a high level (the clear terminal CLR is a chilled seal). Return to the low level after the ON operation of the specification start switch 38 is released).

가 저레벨로 변화하므로 칠드실 사양 세트 표시용 발광 다이오우드(45)가 통전되어 점등되며 또한 플립플롭 회로(41)의 세트 출력단자 Q가 저레벨로 변화되므로써 이 세트 출력단자 Q로 부터의 신호가 부여되는 OR 회로(49)의 한쪽 출력단자가 저레벨로 된다.The flip-flop circuit 42 is set so that the reset output terminal of the flip-flop circuit 42

Changes to the low level, the light emitting diode 45 for the chilled seal specification set is energized and turned on, and the set output terminal Q of the flip-flop circuit 41 is changed to the low level so that the signal from the set output terminal Q is given. One output terminal of the OR circuit 49 is at a low level.

At this time, since the set output terminal Q of the flip-flop circuit 43 is at a low level, the transistor 27 is turned off.

Therefore, the switching chamber temperature detection circuit 25 outputs the detection temperature by the temperature sensor 24 as the chilled chamber specification temperature detection value E _C.

The comparator 30 then measures the internal temperature of the specification switching room 3 based on the chilled room specification temperature detection value E _C from the switching room temperature detection circuit 25 and the temperature reference value E ₂₉ from the reference voltage generation circuit 29. Is detected at the damper ON temperature, the output signal S _{30 is set} to high level, and when detected at the damper OFF temperature, the output signal S ₃₉ is changed to low level, and this output signal S _{39 is applied} to one input terminal of the AND circuit 43. do.

The other input terminal of the AND circuit 48 is provided with a frequency pulse Pf from the generator 31, so that the AND circuit 43 is operated when the signal S ₃₉ is at a high level, that is, the internal temperature of the specification switching chamber 3. Outputs the high-frequency frequency pulse Pf in the ON time zone T _ON detected by the damper ON temperature, and outputs it when the output signal S ₃₉ is low, i.e., in the OFF time zone T _off when the internal temperature of the specification switching chamber 3 is detected as the damper OFF temperature. To low level.

The output signal from the AND circuit 48 is applied to the other input terminal of the OR circuit 49, and at this time, one of the input terminals of the OR circuit 49 is at a low level, so the OR circuit 49 is an AND circuit ( Change the output according to the output signal level from 48).

Here, if the internal temperature of the specification switching room 3 is ON time zone T _ON which is a damper ON temperature, the frequency input pulse Pf from the oscillator 3 is provided to the other input terminal of the exclusive OR circuit 50.

At this time, when the damper position detection signal S _{10 applied} to one input terminal of the exclusive OR circuit is low level (closed to the damper plate 11) as indicated by the point of time in FIG. At the time t1 at which the pulse Pf is applied, the output of the exclusive OR circuit 50 becomes high level, the damper motor is energized to open the damper plate 11, and the damper position detection signal at the time t2 when the damper plate 11 is fully opened. As S ₁₀ changes to a high level, the output of the exclusive OR circuit 50 becomes low level, the output of the exclusive OR circuit 50 becomes high level at the time t3 when the damper motor is disconnected and the output of the first frequency pulse Pf is stopped. The damper plate 11 is closed in the open state by energizing the damper motor by changing to.

By opening and closing the predetermined time T _k and closing the predetermined time T _h of the damper plate 11 alternately, cold air is supplied into the specification switching chamber 3 at the ON time zone T _ON .

Thereafter, when the internal temperature of the specification switching chamber 3 is detected as the damper OFF temperature and becomes T _off time, the damper plate 11 is closed because the output of the exclusive OR circuit 50 becomes low level.

This operation is repeated so that the specification switching chamber 3 is maintained at the temperature of the chilled chamber specification.

The temperature state of this chilled seal specification is shown in FIG. 3 (e).

As can be seen from FIG. 3 (e) and FIG. 5 showing the conventional example described above, the upper and lower widths of the chilled seal specification temperature range are reduced, so that delicate temperature control can be performed.

If the refrigerator compartment gas switch 40 is set to ON to select the refrigerator compartment specification, the flip-flop circuit 43 is set and the other flip-flop circuits 41 and 42 are reset. The transistor 27 is turned on at the same time it is turned on and energized by 46).

When the transistor 27 is turned on, the temperature detection value of the switching chamber temperature detection circuit 25 becomes the refrigerating chamber specification temperature detection value E _r .

Therefore, in the case of the refrigerator compartment specification, the damper ON temperature and the damper OFF temperature are slightly higher than in the case of the chilled seal specification described above. However, in the ON time zone T _ON in which the damper ON temperature is detected as in the case of the chilled seal specification described above, The damper plate 11, that is, the damper device 10 is operated to repeat the opening of the predetermined time T _k and the closing of the predetermined time T _h , and the damper device 10 is closed at the OFF time zone T _off where the damper OFF temperature is detected. Controlled.

Therefore, even in the case of this refrigerator compartment specification, the temperature control can be precisely performed since the upper and lower widths of the refrigerator compartment specification temperature range are reduced.

As described above, the damper control circuit alternately opens and closes the damper device for a predetermined time in the ON time zone where the damper ON temperature is detected based on the temperature sensor when the damper control circuit is set to the chilled chamber specification and the refrigerating chamber specification. When the chilled seal specification and the refrigerating compartment specification are set, the upper and lower temperature widths of the respective specification temperatures can be reduced, so that delicate temperature control can be achieved.

Claims (1)

Specification switching chamber (3) for selecting and setting any one of a freezer compartment specification, a chilled chamber specification and a refrigerating compartment specification, a temperature sensor (24) for detecting the internal temperature of the specification switching chamber, and a specification set in the output and specification switching chamber of the temperature sensor. In the refrigerator provided with the damper apparatus 10 which controls by opening / closing the quantity of cold air supplied to a specification change room based on this, when the freezer specification is set, the above-mentioned damper apparatus 10 will be kept open, and When the refrigerator compartment specification is set, the damper control circuit 23 is provided to operate the damper device to repeat opening and closing of the predetermined time in the opening time period of the damper device based on the output of the temperature sensor 24 described above. Refrigerator.

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