JPH08303920A - Control device for refrigerator - Google Patents

Abstract

PURPOSE: To automatically select a reasonable operation control under an environmental condition wherein trouble does not generate for a control device of a refrigerator which controls the operation and stoppage of a compressor by a set temperature interval of a temperature detector in a refrigerating chamber. CONSTITUTION: An indoor temperature-detecting means 14 which detects an indoor temperature by an indoor temperature detector 13, indoor temperature judging means 15 which judges a detected temperature of the indoor temperature-detecting means 14, outdoor temperature-detecting means 18 which detects an outdoor temperature by an outdoor temperature detector 17, and outdoor temperature-judging means 19 which judges a detected temperature of the outdoor temperature-detecting means 18 are provided. Then, a temperature interval to command the operation and stoppage of a compressor 9 is changed by a compressor-control means 23, based on outputs of the indoor temperature-judging means 15 and outdoor temperature-judging means 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator controller for cooling a cooling chamber to a predetermined temperature by controlling the operation and stop of a compressor.

[0002]

2. Description of the Related Art In a refrigerator, a method of cooling a cooling chamber by controlling the operation and stop of a compressor is generally performed.
An example thereof is shown in Japanese Patent Laid-Open No. 6-194021. Hereinafter, description will be given with reference to FIGS. 4 to 6.

In the figure, reference numeral 1 is a refrigerator main body constituted by a heat insulating material 2, and 3 is a door attached to the opening of the main body 1 so as to be openable and closable. Reference numeral 4 denotes a compartment-forming drawer-type freezer compartment in the center of the main body by compartment walls 5 and 6, 7 denotes a refrigerating compartment provided at the upper portion, and 8 denotes a drawer-type vegetable compartment provided at the lower portion.

Reference numeral 9 is a refrigeration cycle compressor, 10 is a cooler, and 11 is a condenser. Here, the condenser 11 is partially disposed in the front edge opening of the main body 1 and is used to prevent dew condensation in a humid environment. Reference numeral 12 is a blower for forcedly ventilating the cool air cooled by the cooler 10 to the freezer compartment 4, the refrigerating compartment 7, and the vegetable compartment 8, and is normally electrically connected and configured to operate in synchronization with the compressor 9. ing.

Reference numeral 13 is an indoor temperature detector provided in one portion of the freezer compartment 4. Reference numeral 14 denotes an indoor temperature detecting means for detecting the temperature in the freezer compartment 4 by the indoor temperature detector 13. Reference numeral 15 is an indoor temperature determination means for determining whether the indoor temperature detected by the indoor temperature detection means 14 is within a set temperature range.

Further, 16 is a compression for instructing the operation and stop of the compressor 9 based on the output of the indoor temperature determination means 15 with respect to a preset predetermined temperature interval (ON temperature T1-OFF temperature T2 ° C.). Machine control means.

The operation of the refrigerator control device configured as described above will be described with reference to the flowchart of FIG. 5 and the timing chart of FIG. First, the room temperature detecting means 14 causes the room temperature detector 13 to detect the temperature T in the freezing room.
Is detected (Step 1).

Then, the room temperature determination means 15 determines the room temperature T.
Is within the range of the set temperature (T1: ON temperature of the compressor 9, T2: OFF temperature of the compressor 9) (Step)
2) Based on this determination, the compressor control means 16 causes the compressor 9
The operation / stop of is controlled (Step 3).

By these operations, together with the forced ventilation function of the blower 12 that operates in synchronization with the compressor 9,
Cold air cooled by the cooler 10 is sent to each of the freezer compartment 4, the refrigerator compartment 7, and the vegetable compartment 8.

In other words, when the temperature of the indoor temperature detector 13 reaches the OFF temperature T2, the compressor 9 and the blower 1
2 stops and the temperature of each room rises. Then, when the temperature of the room temperature detector 13 reaches the ON temperature T1, the compressor 9 and the blower 12 are operated again and the cooling is restarted. Such a cooling action is repeated intermittently to keep each room cooled to a predetermined temperature (for example, freezing room −18 ° C., refrigerating room 3 ° C.).

In the case of maintaining the cooling chamber at a predetermined temperature by controlling the intermittent operation of the compressor as described above, under a condition where the outside air temperature is high (about 30 ° C. or higher) and a humid environment is likely to occur. ON of the compressor control means 16
If the ON / OFF set temperature interval is too large, the time required to operate and stop the compressor 9 becomes long.

As a result, particularly in summer when both the outside temperature and the humidity increase, the temperature fluctuations in the cooling chamber, especially in the low temperature freezing chamber 4 become large, and the quality of the food stored in the room deteriorates. However, there is a problem in that the tendency is further promoted in the case of being carried out.

Further, since the condenser 11 piping for preventing dew condensation arranged at the front edge opening of the main body can exert its heating action only when the compressor 9 is in operation, the stop time of the compressor 9 is not long. If the length is too long, the temperature of the front edge opening will drop too much, causing condensation on the surface of the main unit.
The ON / OFF set temperature interval of the compressor control means 16 was set in advance to be relatively small. For example, the operating time at this time is t1, and the stop time is t2.

[0014]

However, when the ON / OFF set temperature interval of the compressor control means 16 is small as described above, the number of intermittent operations of the compressor 9 increases and the compressor 9 starts to reach a stable state. There is a problem that the electric power consumption of the refrigerator increases due to the amount of electric power in a transient state up to that point and the loss in cooling efficiency of the refrigeration cycle.

Further, when the compressor 9 is stopped, the high-temperature high-pressure refrigerant accumulated in the refrigeration cycle flows into the cooler 10 due to the pressure difference and becomes a heat load more frequently, which also increases the power consumption. I also had problems that could be a factor.

In view of the above problems, it is an object of the present invention to provide a refrigerator that suppresses power consumption while preventing temperature fluctuations in the cooling chamber and dew condensation on the body surface under practical environmental conditions.

[0017]

In order to solve the above-mentioned problems, a control device for a refrigerator of the present invention comprises an indoor temperature detecting means and an outside air temperature detecting means, and a compressor based on the output of the outside air temperature detecting means. Is provided with compressor control means for changing the ON / OFF set temperature interval of the compressor, and particularly when the output of the outside air temperature detection means is below the first outside air temperature, the ON / OFF set temperature interval of the compressor is expanded. A compressor control means is provided.

Further, when the output of the outside air temperature detecting means is below the first outside air temperature and above the second outside air temperature, compressor control means for expanding the ON / OFF set temperature interval of the compressor is provided. Be prepared.

Further, the compressor control is provided with a door opening / closing detecting means for avoiding the expansion of the ON / OFF set temperature interval of the compressor from the time when the door opening / closing is detected until the next defrosting time of the cooler. It is equipped with means.

[0020]

With the above configuration, the control device for a refrigerator according to the present invention, when the outside air temperature is lower than the first outside air temperature, the ON / OFF set temperature interval of the compressor is expanded and the number of intermittent operation of the compressor is reduced. However, the inflow of high-pressure refrigerant into the cooler at the time of stop is also reduced. At this time, since the outside air temperature environment is not under high temperature and high humidity (absolute humidity is high) conditions, the temperature change in the cooling chamber when the compressor is operating / stopped is not large, and the refrigerant to the condenser piping for dew condensation prevention is not large. Even if the flow is stopped for a long time, the surface temperature of the main body does not fall below the dew point temperature.

Further, when the outside air temperature is below the second outside air temperature, or between the door opening / closing detection time when the door opening / closing is detected and the next defrosting time of the cooler, the compressor is turned on / off.
The expansion of the set temperature interval is avoided and the normal set state is restored.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A refrigerator controller according to an embodiment of the present invention will be described below with reference to FIGS. It should be noted that the same components as those of the related art are denoted by the same reference numerals, the detailed description thereof will be omitted, and only different portions will be described.

In the figure, reference numeral 17 is an outside air temperature detector provided in a part of the outer shell of the refrigerator main body 1. Reference numeral 18 denotes an outside air temperature detecting means for detecting the outside air temperature from the outside air temperature detector 17. Reference numeral 19 is an outside air temperature determining means for determining whether the outside air temperature detected by the outside air temperature detecting means 18 is within a set temperature range.

20 is a door 3 (at least one door)
A door opening / closing detector provided between the main body 1 and the main body 1. Reference numeral 21 is a door opening / closing means for detecting opening / closing of the door 3 from an electric circuit incorporating the door opening / closing detector 20. Reference numeral 22 is a defrost cycle measuring means for measuring the remaining time of the defrost cycle moment by moment.

Reference numeral 23 designates the indoor temperature judging means 15, the outside air temperature judging means 19, the door opening / closing detecting means 21, and the defrosting cycle measuring means 22 to operate and stop the compressor 9 at ON / OFF temperature intervals. It is a compressor control means for instructing.

The operation of the above arrangement will be described below with reference to the flowchart of FIG. 2 and the timing chart of FIG.

First, the room temperature detecting means 14 detects the temperature Tin in the freezing room 4 by the room temperature detector 13 (S).
step4). Then, the room temperature determination means 15 determines the room temperature T.
It is determined whether or not in is within the ON / OFF set temperature range at that time (Step 5).

Next, the outside air temperature detecting means 18 detects the outside air temperature Tout by the outside air temperature detector 17 (Step).
6). Then, the outside air temperature determining means 19 determines that the outside air temperature Tout detected by the outside air temperature detecting means 18 is the set temperature (T
3 ≧ Tout> T4, for example, T3 = 30 ° C., T4 = 10
It is determined whether the temperature is within the range of (° C) (Step 7), and if it is not within the range, the compressor control unit 23 determines that the indoor temperature detector 1
The compressor 9 and the blower 12 are operated and controlled at a normal ON / OFF temperature interval of 3 (T1-T2) (Step 8).

On the other hand, the outside air temperature Tout is equal to the set temperature (T3
If it is within the range of ≧ Tout> T4), then the door opening / closing detection means 21 determines whether or not the door is opened / closed based on the output of the door opening / closing detector 20 (Steps 9 and 10).

If the door is not opened / closed, the ON / OFF temperature interval of the indoor temperature detector 13 is expanded (Step 1).
3). Then, the compressor control means 23 controls the ON temperature T5-O.
The compressor 9 and the blower 12 are operation-controlled at a temperature interval of the FF temperature T6 wider than usual (Step 8).

As a result, the operation / stop time of the compressor 9 is t
5 / t6, which is longer than the normal t1 / t2, and the number of intermittent operations of the compressor 9 is reduced. Therefore, it is possible to reduce the accumulated power in the transient state from the start of the compressor to the stable state and the loss of the cooling efficiency of the refrigeration cycle, and at the same time, the high temperature and high pressure accumulated during the refrigeration cycle when the compressor 9 is stopped. The number of times the refrigerant flows into the cooler due to the pressure difference and becomes a heat load is reduced, and the power consumption of the refrigerator can be reduced.

At this time, the outside air temperature is T3 ≧ Tout
> T4 (for example, 30 ° C ≧ Tout> 10 ° C), which is not in the high outside temperature range, temperature fluctuations increase and the quality of food stored in the room deteriorates. The tendency is not further accelerated, and the absolute humidity is not so high that the temperature of the front edge opening of the main body is too low to cause dew condensation on the main body surface.

On the other hand, since it is not in the low outside temperature range,
The stop time of the compressor 9 becomes too long and the amount of the refrigerant dissolved in the refrigerating machine oil increases, so that it takes time for the refrigerant circulation to stabilize in the refrigeration cycle after the start and the cooling efficiency is not impaired.

Next, when it is determined in Steps 9 and 10 that the door has been opened and closed, the remaining time of the defrosting cycle is measured momentarily after that point (Step 11), and the remaining time is compared with the predetermined defrosting cycle. Presence or absence is determined (Step 12). If there is a remaining time, the ON / OFF temperature interval of the indoor temperature detector 13 is returned to a normal state until the remaining time ends (until the timing of the next defrosting).

Therefore, when a factor that causes a large temperature variation in the room due to the opening and closing of the door, the temperature variation is suppressed in advance by returning to a normal operating state so as not to impair the food storage state. Controlled. Further, if there is no remaining time, the determination as to whether the door is opened or closed is repeated after the defrosting is completed.

[0036]

As described above, according to the refrigerator controller of the present invention, the following effects can be obtained. Since the indoor temperature detector ON / OFF temperature interval that affects the operation / stop time of the compressor is expanded below the first outside air temperature than usual, the temperature fluctuation of the food in the cooling room is increased and the food quality is impaired. In addition, there is no surface dew condensation due to the lowering of the temperature at the front edge opening of the main body under high humidity, and there is no loss of power in the transient state from compressor start to stable state or cooling efficiency of the refrigeration cycle. In addition to being able to disappear, the high-temperature high-pressure refrigerant that has accumulated in the refrigeration cycle when the compressor is stopped flows into the cooler due to the pressure difference, and the number of times it becomes a heat load is reduced, reducing the power consumption of the refrigerator. .

When the temperature is below the first outside air temperature and above the second outside air temperature, the indoor temperature detector is turned on / off.
Since the OFF temperature interval is expanded more than usual, the operation / stop time of the compressor is unnecessarily lengthened under the condition that the outside air temperature is too low, and the refrigerant circulation efficiency after starting is not lowered.

Further, when the door is opened / closed, the ON / OFF temperature interval of the temperature detector is fixed to the normal state until the next defrosting, so that an increase in temperature fluctuation due to the door opening / closing can be prevented in advance. Does not happen.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device for a refrigerator showing an embodiment of the present invention.

FIG. 2 is a flowchart of the same embodiment.

FIG. 3 is a timing chart in the example.

FIG. 4 is a block diagram of a conventional refrigerator control device.

FIG. 5 is a flowchart of a conventional example.

FIG. 6 is a timing chart of a conventional example.

[Explanation of symbols]

 4 Cooling Chamber (Freezing Room) 9 Compressor 13 Indoor Temperature Detector 14 Indoor Temperature Detection Means 15 Indoor Temperature Determination Means 17 Outside Air Temperature Detector 18 Outside Air Temperature Detection Means 19 Outside Air Temperature Determination Means 20 Door Open / Closed Detector 21 Door Open / Closed Detection Means 23 Compressor control means

Claims (4)

[Claims] 1. A main body and a door made of a heat insulating material, a cooling chamber formed in the main body, a refrigeration cycle including a compressor, a condenser, a cooler, and the like, and a room provided in a part of the cooling room. A temperature detector; an indoor temperature detecting means for detecting an indoor temperature by the indoor temperature detector; an indoor temperature determining means for determining whether the temperature detected by the indoor temperature detecting means is within a set temperature range; An outside air temperature detector provided in the outer shell, an outside air temperature detecting means for detecting the outside air temperature by the outside air temperature detector, and an outside air temperature judging means for judging whether the temperature detected by the outside air temperature detecting means is within a set temperature range. And a compressor control unit that changes a temperature interval for instructing the operation and stop of the compressor based on outputs from the indoor temperature determination unit and the outside air temperature determination unit. 2. The control of the refrigerator according to claim 1, further comprising compressor control means for expanding the temperature interval for instructing the operation and stop of the compressor when the output of the outside air temperature detecting means is below the first outside air temperature. apparatus. 3. When the output of the outside air temperature detecting means is below the first outside air temperature and above the second outside air temperature,
2. The refrigerator control device according to claim 1, further comprising compressor control means for expanding a temperature interval for instructing operation and stop of the compressor. 4. A door opening / closing detector and door opening / closing detection means for detecting opening / closing of the door by the door opening / closing detector, and the defrosting of the cooler next time from the time when the door opening / closing detection means detects opening / closing of the door. The control device for a refrigerator according to claim 2 or 3, further comprising a compressor control means for avoiding expansion of a temperature interval for instructing operation and stop of the compressor until the time point.