JPH0820163B2 - Refrigerator controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a control device for a refrigerator provided with an electric damper device that is controlled to be either opened or closed by an electric signal.

(B) Conventional Technology A freezer compartment and a refrigerating compartment are provided, a compressor and a blower are operated based on the temperature of the freezer compartment, and a damper device is operated based on the temperature of the refrigerating compartment to move to the refrigerating compartment. In a refrigerator that adjusts the amount of cold air inflow, the damper device is a gas type that uses a change in the pressure of the enclosed gas as a drive source, an electromagnetic type that uses an electromagnet as a drive source, and a motor type that uses a pulse motor as a drive source. There are things. The gas-type damper device operates the baffle plate to open or close based on the pressure change of the enclosed gas.However, since the pressure change of the enclosed gas is slow, the baffle plate may be in a half-opened state. There is a problem that the accurate temperature control cannot be expected. Therefore, as means for solving this problem, it has been proposed to use an electromagnetic damper device disclosed in Japanese Utility Model Publication No. 54-167847 and a motor type damper device disclosed in Japanese Utility Model Publication No. 60-2271. Both the electromagnetic type and the motor type damper devices are controlled to be turned on / off, that is, opened and closed by an electric signal, and have good responsiveness to the electric signal and are suitable for controlling the temperature of the refrigerating room.

(C) Problem to be Solved by the Invention According to the above-described conventional technique, both the electromagnetic type and the motor type damper devices completely close the discharge port of the cool air to the refrigerating chamber in the closed state, and the cooler is An installed cooling room,
Due to the fact that it is isolated from the refrigerator compartment, it remains closed for a long time when the outside temperature is low, such as in winter. The accumulated cold air is cooled to 0 ° C. or lower due to the effect of the cold air in the cooling chamber, and as a result, frost or freezing is likely to occur from the baffle plate to the wall surface of the refrigerating chamber. Even if a signal for opening the damper device is output when the temperature of the refrigerating room becomes equal to or higher than the upper limit temperature, the damper device cannot be closed because of the frost or freezing, that is, the damper device does not work. It was

On the other hand, when the operation of the compressor is stopped, the damper is closed to prevent the cold air in the refrigerating room from flowing back into the cold air passage and to prevent the formation of frost on the inner wall of the cold air passage, and at the time of starting the operation of the compressor. Japanese Patent Laid-Open No. 57-472 discloses a refrigerator in which the temperature is controlled stably by forcibly opening the damper.
Further, as a refrigerator in which the damper flap of the damper opening / closing device is prevented from freezing and sticking to the damper case by repeating the opening / closing operation of the damper flap at least once for a short period of time every predetermined cycle. , JP-A-61-153471. However, in the former publication of these two publications, the damper device is closed even when the temperature of the refrigerating compartment is high when the compressor is stopped, so that the temperature of the refrigerating compartment exceeds the set temperature, and the refrigerating compartment is cooled. There is a problem that the room temperature becomes difficult to stabilize at the set temperature. In the latter publication, although the damper flap, which is the main purpose, can be opened and closed at regular intervals, the damper flap can be opened and closed. Since the opening / closing operation is performed periodically even when the flap is open, there is a problem that the temperature of the refrigerating room is difficult to stabilize because the probability of including unnecessary opening / closing operation is high.

Therefore, an object of the present invention is to provide a control device for a refrigerator that uses the starting time point of the compressor as the timing for opening the damper device regardless of the temperature of the refrigerating chamber when the damper device is closed.

(D) Means for Solving the Problems The present invention relates to a compressor, a duct for guiding cold air cooled by a cooler to a refrigerating chamber, a damper device for opening and closing a discharge port of the duct, and a temperature of a freezing chamber. An operation control device that controls the operation of the compressor based on the temperature of the refrigerating compartment, and an operation control device that controls the opening / closing operation of the damper device based on the temperature of the refrigerating compartment; When the device is in the closed state based on the temperature of the refrigerating compartment, when the temperature of the freezing compartment becomes equal to or higher than the upper limit temperature, the operation control device causes the damper device to open for a fixed time regardless of the temperature of the refrigerating compartment. It is the one.

(E) Operation According to the present invention, when the operation control device causes the compressor to be in a stopped state based on the temperature of the freezing compartment and the damper device to be in a closed state based on the temperature of the refrigerating compartment. If the temperature of the freezer compartment returns to above the upper limit set temperature because the cooling operation is stopped due to defrosting operation or supercooling, the damper device is forcibly opened for a certain period of time regardless of the temperature of the refrigerator room. Since it is operated, low-temperature low-humidity cool air that has been dehumidified by the cooler is supplied to the refrigerating chamber through the duct, and is retained in the vicinity of the damper device that was closed by the supplied low-temperature low-humidity cool air. High humidity air is forced out. As a result, even when the damper device in which high-humidity air is apt to stay is blocked (especially at low outside air temperature such as winter when the period is likely to be long), the damper device is activated each time. Since it is forcibly opened and closed regardless of the temperature of the refrigerating room, dew condensation and frost formation and frost formation on the surrounding parts of the damper device, which is cooled by the cool air in the duct, are prevented from being suppressed, and the damper device is not frozen. Inactivity (so-called malfunction) is avoided.

(F) Example An example will be described with reference to the drawings. FIG. 2 shows a refrigerator-freezer 1 as an embodiment. 2 is an insulating box,
The inside of the refrigerator is divided into upper and lower parts by a heat insulating partition wall 3, and a freezing chamber F as a first chamber is formed above and a refrigerating chamber R as a second chamber is formed below. Reference numerals 6 and 7 denote heat insulating doors that separately open and close the front openings of the freezing compartment F and the refrigerating compartment R respectively. A cooling chamber 8 is formed in the partition wall 3, and a cooler 10 included in the refrigeration cycle is housed and installed in the cooling chamber 8. A duct 11 communicating with the cooling chamber 8 and both chambers F and R is formed behind the cooler 10, and air blown by the cooler 10, that is, cool air, is blown by a blower 12 provided in the duct. It is sucked and forced out into the duct 11. 12
M is a motor that drives the blower 12. The cool air blown to the duct 11 is blown to the freezer compartment F from the outlet 14 and to the refrigerating compartment R from the outlet 15. Reference numeral 17 is a motor-type damper device provided in the refrigerating compartment R to open and close the discharge outlet 15. The baffle plate 18 rotatable in the front-rear direction based on the temperature in the refrigerating compartment R opens and closes the discharge outlet 15, R
The temperature of is controlled to + 5 ° C on average between + 7 ° C and + 3 ° C. Reference numeral 19 is a heat insulating cover of the damper device 17. Also, 20
Is an electric compressor installed in the machine room 21 below the refrigerator-freezer 1 and included in the refrigeration cycle shown in FIG. machine room
Similarly, a condenser 22 included in the refrigeration cycle and a blower 23 for cooling the condenser and the electric compressor 20 described above are installed inside 21. Reference numeral 5 is an operation panel attached to the front surface of the door 6. Further, a capillary tube is shown in FIG. 5C.

The damper device 17 includes a drive source 24 including an AC motor and a gear mechanism in addition to the baffle plate 18, and by applying an electric signal to the drive source 24, the AC motor is rotated to open or close the baffle plate 18. It works. As shown in FIG. 4, on the back surface of the baffle plate 18, there is provided a sealing member 25 also serving as a cushioning member, which is made of foamed polyethylene to improve the sealing performance in the closed state of the baffle plate 18 and to close the baffle plate 18. I try to reduce the impact of time. Reference numeral 26 denotes a resin case that covers the heat insulating cover 19. The left and right side surfaces are provided with air outlets 27, 27 for blowing cold air from the discharge port 15 into the refrigerating chamber R when the damper device 17 is open.

FIG. 1 shows a control electric circuit as an operation control device of the present invention, in which 28 is an AC power source, and this AC power source is a full-wave rectifier.
29, the motor 12M and the compressor 20 that form the cooling operation circuit are connected in parallel. Reference numeral 30 denotes a microcomputer, which includes a frozen room temperature control unit 31 including an A / D converter, a temperature setting unit, a comparison unit, etc., and a refrigeration room temperature control unit 32 including an A / D converter, a temperature setting unit, a comparison unit, etc. And a timer unit 33 that outputs a pulse for a certain period of time, for example, 10 seconds when the compressor 20 is driven.
The input end of this timer unit is connected to the output end of the freezing room temperature control unit 31. Reference numeral 34 is a first relay that controls the energization of the compressor 20 and the motor 12M. The coil 35 connected to the output end of the freezing room temperature control unit 31 and the coil 20 is closed when the coil is excited to close the compressor 20 and the motor 12M. And a contact 36 for driving. This contact serves as a cooling operation switch. OR
Is an OR circuit, and the refrigerating room temperature controller 32
The output end of the timer section 33 is connected to the output end of the. A switching transistor 37 forms a series circuit with the coil 39 of the second relay 38, and its base is connected to the output terminal of the OR circuit OR. Second relay 38
The contact 40 of the switch serves as a control switch for the damper device 17, and includes a resistor 41 for current limiting and a drive source 24 for the damper device 17.
Together, they form a series circuit. FS is a sensor that detects the temperature of the freezer compartment F, and the measured temperature TM is input as an input to the freezer room temperature control section 31 of the microcomputer 30 and A / D converted to preset upper and lower limits of the freezer compartment F. Both set temperatures TH and TL are compared. RS is a sensor that detects the temperature of the refrigerating room R, and the measured temperature Tm is input as an input to the refrigerating room temperature control unit 32 of the microcomputer 30 and A / D converted to set both upper and lower limits of the refrigerating room R which are preset. It is compared with the set temperatures Th and Tl. DS is a sensor such as a reed switch that detects either the fully open position or the fully closed position of the damper device 17.For example, the opening operation time of the drive source 24 from the fully closed position to the fully open position is detected, and the fully open position is fully opened. By supplying the opening operation time as the closing operation time required until the closing position to the drive source 24 from the refrigerating room temperature control unit 32, the proper positions of fully closed and fully opened are secured.

Next, the control of the refrigerator-freezer 1 will be described with reference to FIGS. 1 to 6.

When the cooling operation is repeated and the measured temperature TM of the freezer compartment F detected by the sensor FS reaches the upper limit set temperature TH stored in the freezer room temperature control unit 31 as shown in FIG. The output from the control unit 31 is given to the coil 35 and the timer unit 33 of the first relay 34. The contact 36 is closed in accordance with the excitation of the coil 35 to be in a so-called ON state, and the motor 12M and the compressor 20 forming the cooling operation circuit are energized and the cooling operation is restarted. At the same time, the timer section 33 causes the OR circuit. The OR circuit outputs a pulse to OR.
The output terminal of OR becomes high level and the switching transistor 37 becomes conductive, the coil 39 of the second relay 38 is excited with this conduction, and the contact 40 which is the control switch of the damper device 17 is closed, and this forced signal is applied. Damper device 17
The driving force source 24 of the above is forcibly driven to open the length damper device 17 for 10 seconds, and during this time, the cool air in the cooling chamber 8 is supplied from the outlets 27, 27 through the discharge port 15. Become. Next, when the cooling operation progresses and the measured temperature TM of the sensor FS reaches the lower limit set temperature TL, the output from the freezing room temperature control unit 31 to the first relay 34 is cut off, the coil 35 is de-excited, and the contact 36. Is opened and turns into the so-called off state, and the motor 12M
And the compressor 20 is de-energized and the cooling operation is stopped. That is, the temperature control of the freezing compartment F is performed on the basis of the repeated ON / OFF state of the contact 36, and the temperature of the freezing compartment F is maintained within the range of both upper and lower set temperatures TH and TL.

On the other hand, the measured temperature Tm of the refrigerator compartment R detected by the sensor RS
When the temperature reaches the upper limit set value Th stored in the refrigerating room temperature control unit 32, a pulse is given from the refrigerating room temperature control unit 32 to the OR circuit OR, whereby the output end of the OR circuit OR becomes high level. The switching transistor 37 becomes conductive,
With this conduction, the coil 39 of the second relay 38 is excited and the contact 40 thereof is closed, so that the so-called ON state is established. The drive source 24 of the damper device 17 is accompanied by the closing operation of the contact 40, that is, the periodic signal.
Is energized and the baffle plate 18 is opened, and the cool air from the cooling chamber 8 is supplied to the refrigerating chamber R from the outlets 27, 27 through the discharge port 15. The open state of the damper device is detected by the sensor DS, and the damper device 17 is fixed in the open state as described above. When the cool air supply to the refrigerating room R progresses and the measured temperature Tm of the sensor RS reaches the lower limit set temperature Tl, the output from the refrigerating room temperature control unit 32 causes the output terminal of the OR circuit OR to become a high level and the switching transistor 37. Are energized, the coil 39 of the second relay 38 is excited by this conduction, the contact 40 is closed, and the drive source 24 is energized so as to give the damper device 17 a closing operation. With the closing operation of the damper, the discharge port 15 is closed and the cold air supply to the refrigerating compartment R is stopped.
That is, the temperature control of the refrigerating compartment R is performed based on the repetition of both opening and closing operations of the damper device 17, so-called ON / OFF operation, and the temperature of the refrigerating compartment R falls within the upper and lower set temperature ranges Th and Tl. Maintained.

Incidentally, FIG. 7 shows a flowchart of the damper device 17 in the operation of the refrigerator-freezer 1.

As described above, according to the operation control of the present invention, when the temperature of the freezer compartment F becomes equal to or lower than the lower limit set temperature TL of the freezer compartment, the operation controller causes the compressor 20 to stop, and the refrigerator compartment R
If the temperature becomes lower than the lower limit set temperature Tl of the refrigerating room, the damper device 17 can be closed by the operation control device, and in this case, the cooling operation is stopped by defrosting operation or supercooling. Therefore, when the temperature of the freezing room returns to the upper limit set temperature TH or higher, the damper device 17 is forcibly opened for a certain period of time regardless of the temperature of the refrigerating room R, so that the cooling device 10 cools and dehumidifies. Low-temperature low-humidity cool air can be supplied from the cooling chamber 8 to the refrigerating room R through the discharge port 15 (that is, by the duct 11), and the damper device 17 which has been closed by the supplied low-temperature low-humidity cold air. It is possible to forcibly remove or dehumidify the high-humidity air staying in the vicinity of. In particular, after the elapse of this fixed time, the control returns to the normal control in which the opening / closing operation of the damper device 17 is controlled depending on the relationship between the upper limit set temperature TH of the freezing compartment and the temperature of the refrigerating compartment. As a result, even when the damper device 17 in which high-humidity air is likely to stay around is blocked (especially even in low outdoor temperature such as winter when the period is likely to be long), the compressor 20 is started. Each time the damper device 17 is forcibly opened and closed, even if the damper device 17 is cooled by the cold air, it is possible to prevent the formation of dew condensation, frosting, and icing on the peripheral portion of the damper device 17, and to prevent freezing. It is possible to prevent a malfunction (so-called malfunction) of the damper device 17 caused by.

(G) Effect of the Invention According to the present invention, the operation control device brings the compressor into a stopped state based on the temperature of the freezer compartment, and the damper device into a closed state based on the temperature of the refrigerating compartment. When the temperature in the freezer compartment returns to the upper limit temperature or higher because the cooling operation is stopped due to defrosting operation or supercooling, the damper device is forced to open for a certain period of time regardless of the temperature in the refrigerator room. In order to operate, cold air of low temperature and low humidity cooled by the cooler can be supplied to the refrigerating room through the duct, and the cold air of low temperature and low humidity that has been supplied accumulates in the vicinity of the damper device that was closed until then. It is possible to forcibly remove or dehumidify the high-humidity air that is present, and as a result, even when the damper device where the high-humidity air is likely to stay is blocked (especially in winter, where the period is likely to be long). Even when the outside temperature is low (season etc.), the damper device can be forcibly opened and closed each time the compressor is started, so that there is no condensation on the surroundings of the damper device that is cooled by the cool air in the duct. It is possible to prevent or prevent the formation of frost and freezing, and prevent the damper device from malfunctioning (so-called malfunction) due to freezing.

[Brief description of drawings]

Each of the drawings relates to the control method of the refrigerator of the present invention,
FIG. 1 is a control electric circuit diagram, FIG. 2 is a vertical sectional view of a refrigerator,
3 is a perspective view of the refrigerator, FIG. 4 is a sectional view taken along the line AA of FIG. 2, FIG. 5 is a refrigerant circuit diagram, FIG. 6 is a time chart showing control characteristics, and FIG. 7 is control of the damper device. It is a flowchart showing. F ... Freezer, R ... Refrigerator, 12 ... Blower, 17 ... Damper device, 20 ... Compressor.

 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-57-472 (JP, A) JP-A-61-153470 (JP, A) JP-A-62-120174 (JP, U)

Claims (1)

[Claims] 1. A compressor, a duct for introducing cold air cooled by a cooler to a refrigerating compartment, a damper device for opening and closing a discharge port of the duct, and controlling the operation of the compressor based on the temperature of a freezing compartment. In the refrigerator provided with an operation control device that controls the opening / closing operation of the damper device based on the temperature of the refrigerating chamber, the operation control device is configured such that the compressor is in a stopped state based on the temperature of the freezing chamber and the damper device is When the temperature of the freezer compartment becomes equal to or higher than the upper limit temperature in the closed state based on the temperature of the refrigerating compartment, the damper device is operated to open for a fixed time regardless of the temperature of the refrigerating compartment. Refrigerator controller.