KR0142739B1 - Defrosting device for a refrigerator - Google Patents

Abstract

The present invention relates to a defroster of the refrigerator,

The simple configuration allows simple operation while defrosting the cooler at an appropriate timing, and the control unit judges whether or not the timing of the start of the defrosting of the compressor is extended when the accumulated operation time of the compressor reaches a certain time, and the door is not opened. In addition, when the forced external operation is not executed and the estimated external air temperature is within the predetermined temperature range, it is judged that the defrosting operation is not necessary, and the defrosting start is extended for a predetermined time, and the defrosting at the extended operation fee is also started. When the door is not opened in the timing and the forced operation is not executed, the start of defrosting is also extended for a predetermined time. In this case, the execution frequency of the extension operation is set to the prescribed number, and the extension operation is defined as the specified number of times. When it is executed, the door is not open and the forced operation is not executed. It is then characterized in that to carry out the defrosting operation.

Description

Defroster of the refrigerator

1 is a flowchart of a control device according to a first embodiment of the present invention;

2 is a schematic diagram showing an electrical configuration of a refrigerator,

3 is a timing chart when no extension operation is performed;

4 is a view corresponding to FIG. 3 when the extension operation is performed twice,

5 is equivalent to FIG. 3 when the extension operation is performed a prescribed number of times,

6 is a view corresponding to FIG. 1 showing a second embodiment of the present invention,

7 is a view corresponding to FIG. 1 showing a third embodiment of the present invention,

8 is a timing chart when an extension operation is performed once;

9 is a diagram corresponding to FIG. 1 showing a conventional example.

* Explanation of symbols for main parts of the drawings

2: freezer 3: cold storage room

4: vegetable room 5, 6, 7: door

8, 9, 10: door switch

11 control device (defrost control means, forced operation memory means, external air temperature determination means)

12: forced operation button 15: cooler

21: refrigeration temperature sensor 23: compressor

The present invention relates to a defrosting apparatus for a refrigerator that performs defrosting operation of a cooler at a predetermined defrosting start timing.

Conventionally, in the refrigerator, when a large amount of defrost is attached to the cooler, the cooling efficiency is lowered, so that the defrosting operation is performed by energizing the defrosting heater at a preset defrosting timing and heating the cooler.

In this case, some of the timings of defrost removal start are set as follows.

(1) When predetermined time passes from last defrosting operation.

(2) When the operation integration time of the compressor of the refrigerating cycle apparatus reaches a predetermined value from the last defrosting operation (see FIG. 9 for the control flow diagram).

(3) The most suitable defrosting start timing is estimated from the external air temperature, the opening and closing number of the door, and the operation rate of the compressor.

However, under the condition of (1), since the start of defrost removal is generally set on the basis of the worst operating condition with much defrost, the defrost removal operation is performed in a state where the amount of defrosting is small. This is very bad.

In addition, under the condition (2), the defrost elimination start timing can be set according to the load condition of the cooler. In this case, the integrated determination value is based on the entry and exit of food, etc. In the case of the operation without the stiffness, the energy efficiency is poor because the frost removal is performed at a predetermined timing even though the amount of frost is less than usual.

In addition, under the condition (3), the most suitable defrost removal start timing can be set, while the calculation amount for calculating the defrost removal start timing increases, and as a control device of the refrigerator, a high speed operation and a high arithmetic precision function are required. It is complicated and expensive.

This invention is made | formed in view of the said situation, The objective is to provide the defrosting apparatus of the refrigerator which can remove a cooler defrost at an appropriate timing, trying to operate by a simple structure.

The defrosting apparatus of the refrigerator according to the present invention is provided with a defrosting control means for executing a defrosting operation of the cooler at a predetermined defrosting start timing, and at least a door for storing that the door of the refrigerator is opened after the last defrosting operation. An open storage means is provided, and a forced driving memory means for storing that the forced continuous operation of the compressor for the cooler has been executed since at least the last defrosting operation, and the external air temperature for detecting or estimating the ambient temperature of the refrigerator When the deciding means is provided and the defrost elimination control means has reached the defrost elimination start timing, the door opening storage means and the forced driving storage means are in a non-memory state, and the detection temperature by the external air temperature determining means or When the estimated temperature is within the predetermined temperature range, the start of defrosting is extended by a certain time. (1) executing the extension operation and further extending the defrost removal start by a predetermined time when the door opening storage means and the forced driving storage means are in a non-memory state at the timing of the defrost removal start at the end of the first extension operation; 2 Extension operation is configured to execute as many times as specified.

In this case, when the defrost removal control means reaches the defrost removal start timing, the door opening storage means and the forced driving storage means are in a non-memory state, and the detection temperature by the external air temperature determination means is within a predetermined temperature range. The first opening operation to extend the start of the sexual love until the integration operation time of the compressor reaches a predetermined time, and at the timing of starting the defrosting at the end of the first extension operation, the door opening storage means and the forced When the operation storage means is in the non-memory state, the defrosting start may be performed for a prescribed number of times to further extend the integration operation time until the accumulated operation time of the compressor reaches a predetermined time.

The external air temperature determining means may be configured to estimate the external air temperature based on the operation rate of the compressor.

In addition, the defrost control means comprises a defrost control device for extending the defrost removal start, the temperature sensor for detecting the temperature of the predetermined storage space in which the defrost control device is accommodated, and further The air temperature determining means may be configured to estimate the external air temperature based on the detection temperature by the temperature sensor.

In addition, when the forced driving is executed during the extension operation, the defrost control means may be configured to stop the time measurement of the extension operation until the forced operation ends.

In the defrosting device of the refrigerator according to claim 1, when the defrosting start timing is set in advance, the defrosting control means has a non-memory state in which the door opening storage means and the forced driving storage means are in a non-memory state. It determines whether the determination temperature by this is a predetermined temperature range. At this time, the door is not opened after the last defrosting operation, and the forced operation is not executed, and when the outside air temperature is within the predetermined temperature range, the defrosting control means judges that the defrosting operation is not necessary and removes the defrosting. When the first extension operation for extending the start by a predetermined time is executed and the door opening storage means and the forced driving storage means are in the non-memory state at the timing of the defrost removal start at the end of the first extension operation, the defrost removal operation is necessary. If not, the second extension operation for further extending the sexual elimination start by a predetermined time is executed.

In this case, the defrost control means is configured to execute the second extension operation a prescribed number of times. Therefore, when the condition that does not require the defrosting operation continues, the first extension operation is executed once, and the second extension operation is executed by the prescribed number of times, and the defrosting operation is performed when the execution of the second extension operation of the specified number of times is finished. Is executed.

However, when the defrost removal condition is established at the start of defrost removal, the defrost removal control means determines that the defrost removal operation is necessary and executes the defrost removal operation at the end of the extension operation. Defrost removal operation can be performed at an appropriate timing.

In the defrost removal device of the refrigerator according to claim 2, the defrost removal control means extends the defrost removal start until the integration operation time of the compressor reaches a predetermined time when the extension operation is performed. As a result, the timing of defrosting can be set accurately.

In the case of the defrosting place of the refrigerator according to claim 3, since the external air temperature determining means estimates the external air temperature based on the operation rate of the compressor, a special temperature sensor for detecting the external air temperature can be omitted. .

In the defrosting apparatus of the refrigerator according to claim 4, the external air temperature determining means is based on a detection temperature by a temperature sensor that detects the temperature of a predetermined storage space in which the defrosting controlling device as the defrosting controlling means is stored. Since the external air temperature is estimated, the lead wire of the temperature sensor for detecting the external air temperature does not need to be derived from the storage space.

In the defrosting device of the refrigerator according to claim 5, the defrosting control means stops the time measurement of the extension operation until the forced operation is terminated when the forced operation is performed during the extension operation. The problem of the rapid cooling cooler being heated by defrosting operation can be avoided.

EXAMPLE

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

2 schematically shows the wiring between the various electrical parts installed in the refrigerator and the control device. In FIG. 2, the refrigerator main body 1 is provided with a freezer compartment 2, a refrigerating compartment 3, and a vegetable compartment 4, and the doors 5, 6, 7 which close each chamber 2, 3, 4 are formed. ) Is installed. Each chamber 2, 3, 4 is equipped with door switches 8, 9, 10 which are closed when the doors 5, 6, 7 are opened. On signals are respectively input to the control device 11 as the removal control means, the door opening storage means, the forced driving memory means and the external air temperature determination means. The forced operation button 12 and the monitor lamp 13 are arranged on the front surface of the freezing chamber 2, and the forced operation button 12 is turned on by pressing the forced operation button 12, and the forced operation command is given to the control device 11. . The monitor lamp 13 is turned on by the control device 11 during forced operation.

In the freezer compartment 2, a cooler chamber 14 is formed, and a cooler 15 and a defrosting heater 16 are provided in the cooler chamber 14. The defrost heater 16 heats the cooler 15 in accordance with the energization by the control device 11. The fan motor 17 is installed above the cooler chamber 14, and when the fan motor 17 is driven by the control unit 11, the air cooled in the cooler chamber 14 is the fan motor. It blows into the freezer compartment 2 by the fan 17a driven by (17). The freezing chamber 2 is provided with a freezing temperature sensor 18, and the temperature (freezing temperature) detected by the freezing temperature sensor 18 is transmitted to the control device 11.

In the cold air outlet 19 to the refrigerating chamber 3, a damper 20 driven by a motor is arranged, and the damper 20 opens the cold air outlet 19 according to the instruction by the control device 11. It is controlled to the open position and the closed position to close the cold air discharge port 19. The refrigerating chamber 3 is provided with a refrigerating temperature sensor 21, and the temperature (refrigeration temperature) detected by the refrigerating temperature sensor 21 is transmitted to the control device 11. In the machine room 22, a compressor 23 is provided. On the basis of the instruction by the control device 11, the compressor 23 starts driving to supply a coolant to the cooler 15 to supply the cooler 15. To cool

The control apparatus 11 is equipped with a temperature sensor and is accommodated in the closed space which is not shown in figure, This control apparatus 11 which also detects the temperature of a closed space by the temperature sensor performs the following control.

(1) When the temperature of the freezing chamber 2 detected by the freezing temperature sensor 18 becomes -20 ° C or higher, the compressor 23 and the fan motor 17 are driven. And the fan motor 17 is stopped.

(2) When the temperature of the refrigerating chamber 3 detected by the refrigerating temperature sensor 21 becomes 5 ° C or more, the damper 20 is controlled to the open position, and when the temperature is 3 ° C or less, the damper 20 is controlled to the closed position. do .

(3) When the operation time of the compressor 23 is integrated, and when the integration operation time reaches a predetermined time, the defrosting heater 16 is energized, and the cooler 15 is heated to perform defrosting operation.

(4) When the forced drive button 12 is turned on, the compressor 23 is forcibly driven until a predetermined time (for example, 90 minutes) has elapsed or the forced drive button 12 is pressed again to be turned off. Forced operation is executed, and the monitor lamp 13 lights up during the forced operation.

(5) In the above (3), when a predetermined condition of the erotica removal start Taijung is established, an extension operation is performed to extend the erotica removal start for a predetermined time.

Next, the effect | action of the said structure is demonstrated. 1 shows a flowchart of the operation of the control device 11. The control device 11 first clears the door opening flag and the forced driving flag (step S1), and then clears the integration timer (step S2). During the normal cooling operation, when it is determined that the door is opened based on the door switches 8, 9 and 10, the door opening flag is set (steps S3 and S4), and the forced operation button 12 is pressed. When the forced drive is executed, the forced drive flag is set (steps S5 and S6). In addition, during the on-period of the compressor 23, the integration timer is driven (steps S7 and S8), and during the off-period, the integration timer is stopped (steps S7 and S9), and the operation integration time of the compressor 23 is calculated. When the integrated timer value reaches, for example, 10 hours (step S10), it is determined that the defrost removal start timing has been reached. However, under the following control, whether to execute the first extension operation for extending the predetermined time without performing defrost removal start is performed. Determine whether or not.

Normally, when the reset state of the door open flag, that is, the closed state of the doors 5, 6, and 7, is continued during the cooling control, the amount of defrost on the cooler 15 is small, which may cause trouble even if the defrost removal operation is extended. There is no work. However, when the doors 5, 6, and 7 are opened, a large amount of external air enters the refrigerator and a large amount of deodorant adheres to the cooler 15. In this case, prolonging the defrosting operation will cause trouble. .

Therefore, the controller 11 determines whether the open flag or the forced driving flag is set at the point where the integration timer has elapsed 10 hours (step S11), and when any one of these flags is set, defrosting Determination is made that operation is necessary, and the flag is cleared before defrosting operation is executed (steps S23 and S24).

When neither flag is set, the external air temperature is estimated based on the detected temperature by a temperature sensor (not shown), and the estimated external air temperature is within a predetermined temperature range (for example, 20 ° C to 30 ° C). It is determined whether or not the temperature is (° C) (step S12). At this time, when the estimated external air temperature is out of the predetermined temperature range, the flag is cleared and then the defrosting operation is executed (steps S23 and S24) (see Fig. 3). This is because when the outside air temperature is lower than the predetermined temperature range, the operation rate of the refrigerator decreases and defrosting is not performed for a long time. Therefore, when the food containing a lot of water is stored, the frost attached to the cooler 15 becomes hard and melts. It is because it becomes a difficult ice sheet and the cooling performance deteriorates and prolonging the start of defrosting is a problem. On the other hand, when the outside air temperature is higher than the predetermined temperature range, the operation rate of the compressor 23 increases, and the amount of heat exchange (cooling amount) in the cooler 15 increases, so that frost is easily attached to the cooler 15. Extending the defrosting run is disruptive.

Here, the estimation of the external air temperature as described above can be obtained based on the relationship between the temperature of the storage space (closed space) detected by a temperature sensor (not shown) installed in the control device 11 and the external air temperature. Since the temperature of the storage space fluctuates relatively under the influence of the external air temperature, the external air temperature is estimated from the temperature of the storage space.

By the way, in the normal cooling operation, when the closed state of the doors 5, 6 and 7 and the non-operation state of the forced operation button 12 continue, and the estimated external air temperature is a predetermined temperature range, the control device 11 Determining that there is no need for defrosting operation, the counter is cleared (step S13), the actual time timer is started (step S14), and the door is opened or not (steps S15, S16) and whether the forced driving button is pressed (step S17). 1st extension operation | movement is performed by continuing cooling operation for a predetermined time (for example, 100 minutes), monitoring S18) (step S19).

During the execution of the first extension operation, the control device 11 sets the door opening flag when the doors 5, 6 and 7 are opened (steps S15 and S16) and is forced when the forced operation button 12 is pressed. The operation flag is set (steps S17, S18). When the first extension operation is completed, the defrost elimination start timing is reached. Therefore, the control apparatus 11 determines whether or not the door opening flag or the forced driving flag is set (step S20). If so, the flag is cleared and the defrosting operation is executed (steps S23 and S24). In addition, when the 1st extension operation | movement is complete | finished, estimation of external air temperature is not performed. This is enough to estimate the outside air temperature at the timing of the first defrosting, since the room temperature cannot change rapidly by tens of degrees in the normal home use environment.

The control device 11 counts up the counter for storing the extension number of times when the defrosting condition has not yet been established even at the defrosting start timing at the end of the first extension operation (step S21). 100 second) When the second extension operation is extended again and the defrost elimination condition is not satisfied at the timing of the defrost removal start at the end of the second extension operation, the second extension operation is repeatedly executed ( Step S22). At this time, the control device 11 executes the defrosting operation when it is determined that the defrosting operation is necessary on the basis of the door opening flag and the forced driving flag at the defrosting start timing at the end of the second extension operation (step S20). (See Figure 4).

By the way, the control device 11 repeatedly executes the second extension operation, and when the counter value, i.e., the second extension operation reaches the prescribed number of times (steps S21 and S22), determines that the defrosting condition is satisfied, and performs the defrosting operation. (See FIG. 5). In this case, as the prescribed number of times for the second extension operation, the refrigerator 5 is left unattended in the closed state of the doors 5, 6, 7 and the non-execution state of forced operation, and the maximum effect can be obtained in both cooling performance and power saving. It can be obtained from possible defrost operation intervals. That is, when the defrost elimination operation interval is set to, for example, 24 hours, the operation integration time of the compressor 23 in the normal cooling operation is 10 hours, and the extension operation time of 100 minutes is repeated three times. Since the defrost removal operation interval can be set to 24 hours or more by executing the first extension operation once and the second extension operation twice), the number of times of the second extension operation in this case is twice. In addition, in order to convert the operation integration time of the compressor 23 into actual time, it is 10 hours from the operation rate of the compressor 23 under the condition that the external air temperature which is the condition which prolongs the execution of sexual intercourse is 20 degreeC-30 degreeC. The actual time corresponding to the integrated operation time can be obtained.

Here, in the present embodiment, the determination of whether to extend the defrosting start is made at the end of the extension operation. In the configuration in which the defrosting operation is executed immediately by opening the doors 5, 6, 7 or operating the forced operation button 12 during the extension operation, the doors 5, 6, This is because the defrosting operation is executed immediately after opening 7). Similarly, if the forced driving button 12 is operated during the extended operation and the forced driving button 12 is operated, the defrosting operation is executed immediately, which causes a problem that the forced driving cannot be executed.

In this embodiment, the flag used for determining whether to extend the defrosting start timing at the end of the extension operation is cleared at the point of defrosting operation. This is because when the door (5, 6, 7) is opened during the defrosting operation, when food enters and exits, air containing moisture flows into the refrigerator in a large amount, and there is a possibility that a large amount of defrosting may be attached to the cooler 15 during the subsequent cooling operation. This is because opening and closing of the doors 5 to 7 needs to be checked even during defrosting.

According to the above configuration, when the condition that does not require the defrosting operation of the cooler 15 until the predetermined defrosting start timing is continued, the first extension operation for extending the defrosting start by a predetermined time is executed, and the extension operation is performed. When the condition that does not require the defrosting operation continues until the defrost removal start timing at the end, the condition that does not require the defrosting operation is performed because the second extension operation that executes the extension operation to the prescribed number of times is executed. In this case, the start of the defrosting operation with a large amount of power consumption can be extended as much as possible to achieve power saving, and when the condition requiring the defrosting operation occurs once, the normal cooling operation or the end of the extension operation is terminated. Since the defrosting operation can be performed, the cooling performance of the cooler 15 can be maintained. Therefore, energy efficiency can be improved by performing defrost removal operation at an appropriate timing unlike the conventional example which performs defrost removal operation when predetermined time elapses from the last defrost removal operation, or when the operation integration time of a compressor becomes a predetermined value.

In addition, unlike the estimation of the timing of defrosting removal, the control device 11 is not complicated and expensive because high-speed operation and high arithmetic precision function are not required as a function of the removal device 11.

As a specific value of the power saving effect according to the present embodiment, when the defrosting interval is set to 24 hours or more in a 400 liter class refrigerator, the amount of power is reduced by 2 kW per month, and the defrosting interval is the actual time. If set to 72 hours or more, the amount of power can be reduced by 4 ~ 5mW per month.

6 shows a flowchart of the control device 11 in the second embodiment of the present invention. This second embodiment differs from the first embodiment in that the extension time at the time of extension operation is determined as the integration operation time of the compressor 23.

That is, the controller 11 counts the counter when it is determined that the defrost elimination operation is not executed because the flag is not set when the integration time value exceeds a predetermined value (step S11). When the count value is 1 (step S13), it is determined that the defrost removal start timing at the end of normal cooling operation is judged, and it is determined whether to start the defrost removal start based on the estimated external air temperature (steps S14, S15). ).

When the count value is 2 or more, it is determined that the end of the extension operation is the timing of defrosting start, and it is determined whether or not the defrosting start is extended by whether the counter has reached the prescribed number of times (steps S14, S16). In this case, the constant value for comparing with the integrated timer value in step S11 is set to 10 hours when the counter is 0 (normal cooling control) and 100 minutes when the counter is 1 or more (in the extended operation). .

According to such a configuration, the integration timer that integrates the operation time of the compressor 23 necessary for determining whether the defrost removal start is extended or not at the timing of the defrost removal start at the end of the extension operation execution is performed. Since it can be combined with the case of operating operation, it is possible to simplify the configuration of the control apparatus 11 and to shorten the development period while achieving the same effect as in the first embodiment, and to reduce the cost.

7 shows a flowchart of the control device in accordance with the third embodiment of the present invention.

All. The third embodiment differs from the first embodiment in that the time coefficient of the extension operation is interrupted during the forced operation when the forced operation is executed during the extension operation (steps S17, S18, S19, S20). That is, when the forced driving is being executed in step S17, the actual time timer is stopped (step S18), and when the forced driving ends (step S19), the actual time timer is started (step S20). According to such a configuration, when the forced operation is executed at the time of the extension operation, the end timing of the extension operation and the end timing of the forced operation can always be shifted as shown in FIG. Irrationality that the defrosting operation is executed can be prevented.

The present invention is not limited only to the above embodiment, but can be modified or expanded as follows.

The defrosting means may be constituted by an apparatus for performing a normal cooling operation, an apparatus for executing the first extension operation, and an apparatus for performing the second extension operation.

The door opening memory may be configured to estimate the temperature of the refrigerator when the door is opened, based on the change.

The external air temperature determining means may be configured to estimate the external air temperature on the basis of the operation rate from the change in the operation rate of the compressor 23 in accordance with the external air temperature.

As apparent from the above description, the defrosting apparatus of the refrigerator of the present invention has the following effects.

According to claim 1, the defrost removal control means extends the defrost removal start by a predetermined time when a condition that does not require defrost removal operation is established when the defrost removal start timing is set in advance. 2 The extension operation is performed as many times as the prescribed number of times, so it is possible to remove the cooler freely at an appropriate timing while attempting simple operation with a simple configuration.

According to claim 2, when the condition that does not require defrosting is established in the timing of starting defrosting at the end of the extension operation, the defrosting commences until the integration operation time of the compressor reaches a predetermined time. Since it extends, the timing of defrost removal can be set correctly.

According to claim 3, since the external air temperature determining means estimates the external air temperature based on the operation rate of the compressor, a special temperature sensor for detecting the external air can be omitted.

According to claim 4, the external air temperature determining means is based on the detection temperature by a temperature sensor which detects the temperature of a predetermined storage space in which the defrost control device as the defrost control device is stored. Since the temperature is estimated, it is not necessary to derive the lead wire of the temperature sensor from the closed space to detect the external air temperature.

According to claim 5, the defrost control means stops the time measurement of the extension operation until the forced operation is terminated when forced operation is performed during the extension operation. The problem of heating by the defrosting operation can be avoided.

Claims (5)

Defrost control means for executing defrost operation of the cooler at a predetermined defrost removal start timing; Door opening storage means for storing that the door of the refrigerator is opened at least after the last defrosting operation; Forced driving storage means for storing that the forced continuous operation of the compressor for the cooler has been executed since at least the last defrosting operation; And external air temperature determination means for detecting or estimating the ambient temperature of the refrigerator, wherein the defrost control means is in a non-memory state when the door opening storage means and the forced driving storage means are at the timing of the defrost removal start. And when the detection temperature or the estimated temperature by the external air temperature determining means is within a predetermined temperature range, the first extension operation is performed to extend the defrost removal start by a predetermined time, and the defrost removal start at the end of the first extension operation is performed. When the door opening memory means and the forced driving memory means in the non-memory state in the timing, the second extension operation for extending the defrost removal start by a predetermined time is configured to perform a predetermined number of times. Defroster. 2. The compressor of claim 1, wherein the defrost control means comprises a timer for measuring the integration operation time of the compressor, wherein a predetermined time of the first extension operation and the second extension operation for extending the defrost removal start is determined by the timer. Defrost eliminator of the refrigerator, characterized in that set based on integration operation time. 3. The defroster of the refrigerator according to claim 1 or 2, wherein the external air temperature determining means is configured to estimate the external air temperature based on the operation rate of the compressor. 3. The defrost removal control means according to claim 1 or 2, wherein the defrost removal control means comprises a defrost removal control device for performing an extension operation to extend the defrost removal start, and the temperature of a predetermined storage space in which the defrost removal control device is accommodated. And a temperature sensor for detecting an external air temperature determining means is configured to estimate the external air temperature based on the detection temperature by the temperature sensor. The refrigerator according to claim 1 or 2, wherein the defrost control means is configured to stop the time measurement of the extension operation until the forced operation is terminated when forced operation is performed during the extension operation. Defroster.