JPS63183365A - Defrostation controller for freezing refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a defrosting control device for a refrigerator-freezer.

[Prior art]

In conventional defrosting control devices for refrigerators and freezers, a timer is used to integrate the operating time of the compressor, and when the set time is reached, the defrost circuit is activated to energize a defrost heater such as an electric heater, and the cooler is turned off. It is designed to remove frost that has adhered to the surface.

[Problem that the invention seeks to solve]

However, in the defrosting control device with the above structure, the time is only set by a timer, so the defrosting circuit cannot be turned on during the day when the user is frequently using it for food replacement, etc., and the temperature inside the refrigerator is rising. In such a case, the temperature inside the refrigerator will rise due to stopping the cooling operation and energizing the defrosting heater, and the temperature inside the refrigerator will increase due to load changes during the day, causing the temperature inside the refrigerator to rise. The disadvantage was that the temperature of preserved foods would rise and the freshness would drop significantly.

The present invention has been made in view of the above-mentioned matters, and is designed to determine the time to start defrosting based on the time setting by a timer and the indoor illuminance by an illuminance sensing means.

[Means for solving problems]

The present invention provides a timer for accumulating operating time of a compressor, an accumulated time determining means for determining whether the timer has elapsed a predetermined time, an indoor illuminance sensing means for detecting indoor illuminance, and an indoor illuminance that is lower than a predetermined illuminance. a continuous determination means for determining whether the continuous time of the low illuminance state has exceeded a predetermined time; and a maximum illuminance determination means for determining whether the compressor cumulative time by the timer is greater than the maximum continuous setting time. It is equipped with a set time determination means.

[Function] According to the present invention, the defrosting circuit is activated when the timer for accumulating the operating time of the compressor reaches a predetermined time and the room is in a low-light condition for a certain period of time or more, so the defrosting circuit is activated only when the refrigerator-freezer is not in use. Since defrosting is performed, there are no inconveniences like in the conventional method. Claim 2 deals with forgetting to turn off the lights, etc., and the defrosting circuit is activated when the cumulative operating time of the compressor becomes greater than the maximum setting time, regardless of the timer or lighting level. It looks like this.

[Example] 1 is a refrigerator-freezer main body with a front opening, and its interior is divided into three upper and lower chambers by two upper and lower heat-insulating partition walls 2.3,
From the top, there are a freezer compartment 4, an ice room 5, and a refrigerator compartment 6, and the front openings of each of these compartments have insulating doors 7, 8, respectively.
9 is provided.

10 is a cooler provided inside the upper heat insulating partition wall 2, and is connected to the refrigeration cycle IL/10 along with a compressor to be described later.
The cold air cooled here is sent to the blower fan 1.
1 through the cold air duct 1-12.13 to the freezer compartment 4.
, an ice room 5 and a cold room 6.

The freezing chamber 4 is maintained at a predetermined temperature by turning on and off the compressor according to the temperature sensor 14, and the opening and closing of the ice chamber 5 and the refrigerator chamber 6 are controlled by the second temperature sensor 15 and the third temperature sensor 16. A predetermined temperature is maintained by adjusting the amount of cold air using damper devices 17 and 18.

The cold air in the freezer compartment 4 passes through the return port 19, and the cold air in the ice room 5 passes through the return port 20 and returns to the cooler 10. return duct 21
Cool through the above! It returns to the 10th side.

FIG. 3 is an electric circuit diagram of the present invention, and 22 is a one-chip microcomputer (hereinafter referred to as microcomputer), which has a program ROM, data RAM, and ALU inside, and is driven by a reference clock oscillation circuit 23. be done. Further, the reference clock oscillation circuit 23 is also used as a clock reference signal for a clock display section 24 attached to the front surface of the refrigerator-freezer body 1.

It is an indoor illuminance sensing means such as a phototransistor attached to the upper part of the 25Fi refrigerator/freezer body 1, and together with the first to third temperature sensors 14, 15, and 16, an A/D converter that converts an analog electrical signal into a digital electrical signal, respectively.
It is connected to the microcomputer 22 via D converters 26, 27, 28° 29.

30, 31, 32, and 33 are switches that are controlled on and off by the output signal from the microcomputer 22, and are used to drive the compressor 34, the blower fan 11, the defrosting heater 35, and the first damper that drives the damper devices 17 and 18, respectively. The damper motor 36 and the second damper motor 37 are connected in series.

Figure 4 is a functional block circuit diagram inside the microcontroller.
The time is displayed on the clock display device 24 by a signal from the reference clock oscillation circuit 23 via the reference time setting means 38 and the clock display control means 39.

Further, the signals from the internal temperature sensors 15 and 16 drive the damper devices 17 and 18e via the internal temperature determining means 40, the damper device opening/closing determining means 41, and the damper control means 42, and the signals from the internal temperature sensor 14 drive the damper devices 17 and 18e. is the cumulative compressor operation time determining means 43 from the chamber temperature determining means 40.
and drives the compressor 34 through the compressor control means 44. Reference numeral 45 denotes a defrosting device energization start determining means for determining when to start energizing the defrosting heater 35 by taking in a signal from the indoor illuminance determining means 46 and a signal from the compressor operation time determining means 43. When the compressor 34 is energized, the heater control means 47 is operated, and when the compressor 34 is driven, the compressor control means 44 is operated.

FIG. 5 is a timing chart of each part of the present invention, which performs operations as shown in the flowchart of FIG. 6.

That is, the microcomputer 21 has the indoor low illuminance limit value L (LuX).
is stored, the indoor illuminance 1 (LuX)i is measured by the indoor illuminance sensing means 25, and the indoor illuminance determining means compares and determines the magnitude of the indoor illuminance and the indoor low illuminance limit value. If rNoJ, it will be normal cooling operation mode.
If YESJ, it is determined whether the low illumination state has continued for a certain time H or more, and if the low illumination state has continued for a certain time H or more, the temperature of the freezer compartment 4, ice room 5, and refrigerator compartment 6 is below the predetermined temperature. After checking whether the condition is satisfied or not, if the condition is met, energization to the defrosting heater 35 is started.

In other words, continuous low indoor illumination means that the indoor lights are turned off at night and the refrigerator is not replaced with food, and the internal temperature does not rise much even if the defrost heater is energized. That's not the case.

Also, the reason why the temperature inside each refrigerator is checked immediately before the start of defrosting is to detect whether the cooling operation is temporarily stopped and the temperature inside the refrigerator is not rising more than necessary.

Father, we installed a maximum set time determination means to compare the cumulative operating time d of the compressor and the continuous maximum set time DL before the normal cooling operation, and when d>Dt, the defrosting device is activated regardless of the illuminance or internal temperature. The reason why the defrosting device is driven is to prevent the defrosting device from not operating at any time, and the continuous maximum set time DL is set to a value larger than the defrosting cycle set time.

[Effects] Since the present invention is configured as described above, defrosting is started after the predetermined interval of the timer for integrating the operation of the compressor has elapsed and at low illuminance. It is possible to defrost the refrigerator while avoiding the periods when it is frequently used, thereby preventing abnormal temperature rises in the refrigerator and loss of freshness of food. Even if the user forgets to turn off the indoor lights, the effect of the maximum setting time determining means can provide a remarkable effect in that inconveniences caused by the defrosting device not operating can be prevented.

[Brief explanation of the drawing]

Figure 1 is a front view of a refrigerator-freezer equipped with the device of the present invention;
The figure is a side sectional view of the same refrigerator-freezer, Figure 3 is an electric circuit diagram of the device of the present invention, Figure 4 is a functional block circuit diagram of the device, Figure 5 is a timing chart of each part of the device, and Figure 6 is
The figure shows a flowchart of the same device. 22: Microcomputer, 25: Indoor illuminance sensing means, 34: Compressor, 35: Defrosting heater. Agent Patent Attorney Takeshi Sugiyama (and 1 other person) No. IM Figure 2

Claims (1)

[Claims] 1. A timer for accumulating the operating time of the compressor;
an integrated time determining means for determining whether the timer has elapsed a predetermined time; an indoor illuminance sensing means for detecting indoor illuminance; an illuminance determining means for determining whether the indoor illuminance is lower than a predetermined illuminance; continuous time determination means for determining whether the continuous time of the illuminance state has exceeded a predetermined time, and the defrosting circuit is energized when the predetermined time of the timer has elapsed and the low illuminance state has elapsed for a certain period of time. A defrosting control device for a refrigerator/freezer. 2. A timer that totals the operating time of the compressor,
an integrated time determining means for determining whether the timer has elapsed a predetermined time; an indoor illuminance sensing means for detecting indoor illuminance; an illuminance determining means for determining whether the indoor illuminance is lower than a predetermined illuminance; continuous time determination means for determining whether the continuous time of the illuminance state has exceeded a predetermined time, and energizes the defrosting circuit when the predetermined time of the timer has elapsed and the low illuminance state has elapsed for a certain period of time. In the defrosting control device for a refrigerator/freezer, a maximum setting time determining means is provided for determining whether or not the cumulative compressor time set by the timer is greater than the continuous maximum set time, and after the predetermined time set by the timer has elapsed, A defrosting control device for a refrigerator-freezer, characterized in that the defrosting circuit is energized when the accumulated time of the compressor becomes greater than the maximum set time even if the illuminance state does not elapse for a certain period of time.