KR870001851Y1 - Control device for a refrigerator - Google Patents

Abstract

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Description

Refrigerator

1 to 3 show a first embodiment of the present invention,

1 is a longitudinal side view of the upper half of the refrigerator.

2 is a diagram of a refrigeration cycle.

3 shows an electrical configuration.

4 is an equivalent view of FIG. 2 showing a second embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

4,52: Cooler for refrigerator compartment 5: Cooler for first freezer compartment

6: second cooler for freezer 36: control circuit

53: freezer cooler

The present invention relates to a refrigerator having two or more functions such as forced defrosting operation of the cooler forcibly removing frost from the cooler and forced operation operation of the cooler in addition to the operation related to the general refrigeration cycle.

Conventionally, in a so-called direct-cooling refrigerator, a rapid cooling function for rapidly freezing foods stored in a freezer compartment by forcibly operating only a freezer compartment cooler for a predetermined time, and a concentrated implantation unit installed so as to have a lower temperature than other parts in the freezer compartment cooler. It is equipped with a regular defrosting function which removes the frost attached to a chopper regularly by a heater or the like.

The conventional refrigerator is configured to execute the rapid freezing operation by stopping the regular defrosting in the middle when there is an operation command of the rapid freezing operation during the regular defrosting, and when the regular defrosting operation command is performed during the rapid freezing operation. Even the rapid freezing operation is continued as it is. For this reason, the defrost of the freezer compartment cooler is not completely performed, and there is a drawback that sometimes deferment occurs until the next regular defrost and sufficient defrost is not performed. In general, the concentrated implantation part of the freezer compartment cooler is located at the ceiling and the rear part of the freezer compartment, and is deferred until the next regular defrosting without defrosting completely as described above. In the case of large growth of the ice flotation, the ice flotation of the freezing chamber ceiling falls during the subsequent defrosting, causing discomfort to the user.

Therefore, an object of the present invention is to provide a refrigerator having two or more functions such as forced defrosting operation of the cooler and forced operation operation of the cooler in addition to the operation related to the general refrigeration cycle, and having the effect that the defrosting of the cooler can always be sufficiently performed. To provide.

The present invention has two or more functions such as forced defrost operation of the cooler and forced operation of the cooler. There is a characteristic in point.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

In Fig. 1, reference numeral 1 denotes a refrigerator main body including a freezer compartment 2 and a refrigerating compartment 3, 4 denotes a refrigerator for a refrigerating compartment provided at an upper portion of the refrigerating compartment 3, and 5 denotes a freezer compartment 2. The first freezer compartment cooler provided at the outer bottom, 6 is a second freezer compartment cooler for concentrated implantation installed at the ceiling and the inner wall of the freezer compartment 2, in which case the second freezer compartment cooler 6 is It is comprised so that it may become lower temperature than the 1st freezer cooler (5). In addition, (7) is a defrost heater installed in addition to the 2nd freezer cooler 6. On the other hand, in FIG. 2 showing a refrigeration cycle, reference numeral 8 denotes a compressor, the outlet 8a of which is connected to the main capillary 10 via the condenser 9, and such a refrigerant flow path It is divided into two at the outlet side of the capillary tube 10 and one branch is connected to the inlet 8b of the compressor 8 via the capillary tube 11, the refrigerator compartment cooler 4, and the 2nd freezer compartment cooler 6. have. The other branch is connected to the inlet port 14a of the bubble pump 14 as a flow path switching device via the solenoid valve 12 and the capillary tube 13.

The bubble pump 14 discharges the refrigerant flowing from the inlet port 14a to the first outlet port 14b when the built-in heater 15 (see FIG. 3) is cut off, and the built-in heater 15 In the energized state, the refrigerant flowing in from the inlet 14a is discharged to the second outlet 14c, and the first outlet 14b is the inlet of the second freezer cooler 6 via the capillary tube 16. It is connected to the side. The first freezer compartment cooler 5 is interposed between the second outlet 14c of the bubble pump 14 and the inlet port of the second freezer compartment cooler 6.

3 shows only a part of the electric circuit configuration of the refrigerator related to the gist of the present invention. In FIG. 3, reference numeral 17 denotes a refrigerator compartment temperature control unit whose set temperature TR is changeable by the variable resistor 18, which is arranged to detect the temperature of the refrigerator compartment chiller 4. When the detection temperature by (19) exceeds the upper limit of the set temperature TR, the comparison circuit 20 outputs a high level signal, and when the detection temperature falls below the lower limit of the set temperature TR, the comparison circuit 20 Outputs a low level signal.

The output of the comparison circuit 20 is provided to the driving circuit 24 via the inverter 21, the AND circuit 22, and the OR circuit 23, so that the driving circuit 24 supplies a high level signal. Only when received, the solenoid valve 12 is energized to open it. Reference numeral 25 denotes a freezer compartment temperature control unit whose actual temperature TF is changeable by the variable resistor 26, which is a detection temperature by the thermistor 27 arranged to detect the temperature of the second freezer compartment cooler 6. When the value exceeds the upper limit of the set temperature TF, the comparison circuit 28 outputs the level signal, and when the detection temperature falls below the lower limit of the set temperature TF, the comparison circuit 28 outputs the low level signal.

The output of the comparison circuit 28 is provided to the driving circuit 31 via the AND circuit 29 and the OR circuit 30, so that the driving circuit 31 is only when the high level signal is received. The compressor 8 is energized to drive it. Reference numeral 32 denotes an auto-return quick-freezing start switch interposed between the DC power supply E and the set input terminal S of the RS flip-flop 33, and RS flip-flop in accordance with its on operation. (33) is set. Reference numeral 34 denotes a timer unit for defrost command supplied with a current from the DC power supply E, which outputs, for example, one reamer pulse Pc every 24 hours.

Reference numeral 35 denotes an RS flip flop set by the timer pulse Pc. Reference numeral 36 is a control circuit, which is composed of transfer gates 37 and 38 which receive respective outputs of the RS flip-flops 33 and 35, respectively. The transfer gates 37 and 38 are conducted only when the low level signal is applied to the gate terminals 37a and 38a, and the output terminal of the transfer gate 37 is connected to the gate terminal 38a of the transfer gate 38. The output terminal of the transfer gate 38 is connected to the gate terminal 37a of the transfer gate 37. Reference numeral 39 denotes an RS flip-flop in which a set input terminal S is connected to an output terminal of the transfer gate 37, and the set output terminal Q is input to each input terminal of the OR circuits 23 and 30 and the driving circuit 40. It is connected to the terminal. The drive circuit 40 energizes the built-in heater 15 of the bubble pump 14 only when a high level signal is received. The output of the RS flip-flop 39 is also provided to the timer circuit 41. The timer circuit 41 is a timer that becomes a high level signal when, for example, 40 minutes have elapsed when the high level signal is received. It outputs a pulse P ₄₁ and, thereby resetting the RS flip-flop (33 and 39) by the timer pulse P _41. Reference numeral 42 denotes an RS flip flop in which the set input terminal S is connected to the output terminal of the transfer gate 38, and the output at the set output terminal Q is applied to the drive circuit 43 and the timer circuit 44. The drive circuit 43 is configured to energize the defrost heater 7 only when a high level signal is received, and the timer circuit 44 generates a high level signal when, for example, 30 minutes have elapsed when the high level signal is received. The timer pulse P ₄₄ is output, and the RS flip-flops 35 and 42 are reset by the timer pulse P ₄₄ . The output of the RS flip-flop 42 is also provided to each input terminal of the AND circuits 22 and 29 via the inverter 45.

The functions of the control circuit 36, the R-S flip-flops 33, 35, 39, 42, the timer circuits 41, 44, and the like can also be obtained by the program of the microcomputer.

Next, the operation of this embodiment of the above configuration will be described. During the normal cooling operation in which the rapid freezing start switch 32 is not operated on and the defrosting operation of the second freezer compartment cooler 6 described later is not performed, the temperature of the refrigerator compartment cooler 4, namely, When the detection temperature by the MR 19 is equal to or higher than the upper limit of the set temperature TR, the high level signal is output from the comparison circuit 20, and the temperature of the second freezer cooler 6, that is, the thermistor 27 When the detection temperature is higher than or equal to the upper limit of the set temperature TF, the high level signal is output from the comparison circuit 28, and is inverted by the inverter 21 with respect to one input terminal of the AND circuit 22. The low level signal is applied, and the high level signal is applied to one input terminal of the AND circuit 29.

In other words, in the state where the defrosting operation is not performed, the high level signal is applied to the other input terminal of the AND circuits 22 and 29 as described later. As a result, the AND circuit 29 is supplied to the driving circuit 31. ), The high level signal is applied via the OR circuit 30, the compressor 8 is energized and the low level signal is applied to the drive circuit 24, and the solenoid valve 12 is disconnected. . Therefore, the refrigerant discharged from the compressor 8 is supplied to both the refrigerating chamber cooler 4 and the second freezing chamber cooler 6, and the refrigerating chamber 3 and the freezing chamber 2 are simultaneously cooled.

As a result of the cooling operation, when the temperature in the refrigerating chamber 3 decreases, and the detection temperature by the thermistor 19 falls below the lower limit of the set temperature TR, the low level signal is output from the comparison circuit 20 to form an AND circuit. Since the high level signal inverted by the inverter 21 is applied to the 22, as a result, the high level signal is applied to the driving circuit 24, so that the solenoid valve 12 is energized. At this time, that is, in the state where the freezing chamber 2 is not rapidly frozen, the built-in heater 15 of the bubble pump 14 is disconnected as described later, so that the bubble pump 14 is provided with the inlet port 14a and the first chamber. The state which communicated between 1 outlet 14b is shown. Therefore, the refrigerant discharged from the compressor 8 is supplied only to the second freezer compartment cooler 6 via the solenoid valve 12, the bubble pump 14, etc., and the cooling operation of the freezer compartment 2 is continued. When the temperature in the freezing chamber 2 is lowered again by this cooling operation, and the detection temperature by the thermistor 27 falls below the lower limit of the set temperature TF, the low level signal is output from the comparison circuit 28, so that the compressor ( 8) is cut off and the operation of the refrigeration cycle is stopped. Subsequently, when the detection temperature by the thermistor 27 exceeds the upper limit of the set temperature TF, the driving of the compressor 8 is resumed, and the solenoid valve 12 is closed in accordance with the detection temperature by the thermistor 19. Or, by opening, the same general cooling operation is repeated as described above.

In order to freeze household refrigeration or water quickly, a frozen product is placed in the freezer compartment 2, in particular, on the first freezer compartment cooler 5, and the rapid freezing start switch 32 is placed for a short time. When it is turned on, the RS flip-flop 33 is set so that the high level signal at the set output terminal Q is applied to the transfer gate 37. At this point, that is, in the state where the defrosting operation of the second freezer compartment cooler 6 is not performed, the low level signal is applied to the gate terminal of the transfer gate 37 as described later. The high level signal is output so that the RS flip flop 39 is set.

For this reason, a high level signal is output from the RS flip-flop 39, which is applied to the driving circuits 24, 31, and 40, whereby respective states of the refrigerating chamber temperature control unit 17 and the freezing chamber temperature control unit 25 are provided. Irrespective of this, the solenoid valve 12 and the compressor 8 are energized and the built-in heater 15 is energized so that the bubble pump 14 communicates between the inlet 14a and the second outlet 14c. Will be displayed. Then, the coolant discharged from the compressor 8 is forced to the first freezer compartment cooler 5 and the second freezer compartment cooler 6 via the solenoid valve 12 and the bubble pump 14. A quick freezing operation is started. At the same time as the start of the rapid freezing operation, the timer circuit 41 which receives the high level signal from the RS flip-flop 39 starts the timer operation, and when 40 minutes have elapsed thereafter, the timer pulse 41 is generated by the timer pulse P. ₄₁ is output and the RS flip-flops 33 and 39 are reset. As a result, the solenoid valve 12, the compressor 8, and the built-in heater 15 are all disconnected, and the said rapid freezing operation is complete | finished.

On the other hand, defrost in the freezer compartment 2 is performed as follows. That is, since only the second freezer compartment cooler 6 is operated during the normal cooling operation, the conception is concentrated on the second freezer compartment cooler 6, and during the rapid freezing operation, the first freezer compartment cooler 5 also operates. The implantation moves by sublimation to the second freezer cooler 6 having a lower temperature, and as a result, the implantation grows only in the second freezer cooler 6. However, when the timer pulse Pc is output from the timer unit 34 and the RS flip-flop 35 is set while the rapid freezing operation is not performed, the high level signal at the set output terminal Q is applied to the transfer gate 38. do. At this time, in the state where the rapid freezing operation is not performed, the low level signal is applied to the gate terminal of the transfer gate 38 as described later, so that the high level signal is output from the transfer gate 38 so that the RS flip-flop 42 Is set. For this reason, a high level signal is output from the RS flip-flop 42, which is applied to the drive circuit 43, thereby starting energization to the defrost heater 7 and simultaneously a high level signal from the RS flip-flop 42. The inverter 45 is inverted to the low level signal and input to the AND circuits 22 and 29, so that the solenoid valve 12 and the compressor 8 are forcibly disconnected, thereby defrosting the heater 7. The regular defrosting operation, which is a forced defrosting operation, is started. At the same time as the start of the regular defrosting operation, the timer circuit 44 receiving the high level signal from the RS flip-flop 42 starts the timer operation, and when 30 minutes have elapsed thereafter, the timer pulse P ₄₄ in the timer circuit ₄₄ It is output and the RS flip flops 35 and 42 are reset. As a result, the defrost heater 7 is disconnected, and the AND circuits 22 and 29 allow passage of signals from the refrigerating chamber temperature control unit 17 and the freezing chamber temperature control unit 25, respectively. The solenoid valve 12 and the compressor 8 are respectively controlled by means of 17 and 25, thereby ending the regular defrosting operation. For example, during the regular defrosting operation, the high level signal from the RS flip-flop 35 is provided to the gate terminal 37a of the transfer gate 37 via the transfer gate 38, so that the transfer gate 37 is non- The conduction state is shown. For this reason, when the RS free-flop start switch 32 is turned on during the regular defrost operation and the RS flip-flop 33 is set, the high level signal outputted by the RS flip-flop 33 passes through the transfer gate 37. Therefore, the rapid freezing operation is not started. Subsequently, when the regular defrosting operation is stopped and the RS flip-flop 35 is reset, the low level signal is inputted to the gate terminal 37a of the transfer gate 37 so that the transfer gate 37 is turned on. The high level signal at the flop 33 passes through the transfer gate 37 so that the RS flip flop 39 is set, whereby the metal freezing operation is started as described above. On the other hand, during the rapid freezing operation, since the high level signal from the RS flip-flop 33 is applied to the gate terminal 38a of the transfer gate 38 via the transfer gate 37, the transfer gate 38 is not conducting. It shows the state. Therefore, when the timer pulse Pc is output from the timer unit 34 during the rapid freezing operation and the RS flip flop 35 is set, the high level signal output by the RS flip flop 35 passes through the transfer gate 38. Therefore, the regular defrosting operation is therefore not started. Thereafter, when the rapid freezing operation is stopped and the RS flip-flop 33 is reset, the low level signal is inputted to the gate terminal 38a of the transfer gate 38 so that the transfer gate 38 is turned on so the RS flip-flop The high level signal at 35 passes through the transfer gate 38 so that the RS flip-flop 42 is set, whereby the regular defrosting operation is initiated as described above.

According to this embodiment described above, at the time when the timer pulse Pc is output from the timer unit 34, in other words, when the operation command of the regular defrost is issued, the regular defrosting operation is immediately started when the rapid freezing operation is not performed. At the same time, when the rapid freezing operation is performed, since the defrosting operation is started following the end of the rapid freezing operation, the regular defrosting is performed reliably every time, so that the defrosting in the freezer compartment 2 is conventionally performed. There is no fear of becoming insufficient. Of course, rapid freezing operation is not interrupted without care due to regular defrosting.

In addition, this invention is not limited to the said Example, For example, you may apply to the refrigerator provided with the refrigeration cycle of the well-known structure shown in FIG. In FIG. 4, reference numeral 46 denotes a compressor, 47 denotes a condenser, 48, 49 and 50 are capillaries, 51 denotes a solenoid valve, and 52 denotes a refrigerating chamber cooler. In the freezing chamber, the refrigerant from the compressor 46 is supplied to the freezing chamber cooler 53 through the solenoid valve 51 during the rapid freezing operation, and the compressor 46 is stopped during the regular defrosting operation. Is supplied to a defrost heater (not shown) attached to the freezer compartment cooler (53).

According to the present invention, as apparent from the above description, the present invention has a configuration having two or more functions such as forced defrost operation of the cooler and forced operation operation of the cooler, in addition to the operation related to the general refrigeration cycle, and without damaging other functions. It is an excellent effect that the defrosting can always be performed sufficiently.

Claims (1)

In refrigerators equipped with functions such as forced defrosting of the cooler and forced operation of the cooler, in addition to the operation related to the normal refrigeration cycle, when a command of operation of one function is performed, the other function that is first given an operation command is first performed. Having a control circuit for shifting to the next function, the control circuit includes a switch 32 and a timer unit 34 for activating one function operation, and RS as a storage element for maintaining the function operation for a certain period of time. And a transfer gate element (37,38) for preventing the start of another operation during a period in which one functional operation is maintained.