JPH06307753A - Controller for freezing refrigerator - Google Patents

Abstract

PURPOSE:To maintain capacity of a cooling system for a long period by reducing an operation of a compressor when an operating load the compressor is increased irrespective of a decrease in cooling capacity in a freezing refrigerator for cooling and storing food. CONSTITUTION:When an operating efficiency of a compressor 17 calculated by operating efficiency calculating means 23 is raised or a change rate calculated by change rate calculating means 25 is lowered, reference temperature correcting means A25, B28 raise a reference temperature for operating the compressor 17 thereby to reduce the efficiency of the compressor 17 to alleviate an operating load of a cooling system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention optimizes the operation of a compressor that compresses and circulates a refrigerant in a refrigerating refrigerator (hereinafter referred to as a refrigerator) cooling system to maintain the capacity of the cooling system for a longer period of time. The present invention relates to a refrigerator-freezer control device.

[0002]

2. Description of the Related Art A control device for a refrigerator / freezer controls a compressor, a cooling fan, and an electric damper so as to control the temperature of each of a refrigerator compartment, a refrigerator compartment, and a vegetable compartment at a preset temperature. (For example, Japanese Utility Model Laid-Open No. 2-47424).

A conventional control device for a refrigerator-freezer will be described below with reference to the drawings. FIG. 9 is a block diagram of a conventional refrigerator-freezer control device, and FIG. 10 shows a configuration of a conventional refrigerator-freezer. 1 is the refrigerator body, 2 outer boxes
And the inner box 3 and the urethane foam heat insulating material 4 formed in the space between the two, and three doors 5, 6, 7 are provided at the front opening.
Is provided. The doors 5, 6 and 7 are arranged corresponding to the openings of the freezer compartment 8, the refrigerator compartment 9 and the vegetable compartment 10 of the refrigerator body 1, respectively.

A bottom plate 11 of the freezer compartment 8 and a top plate 12 of the refrigerating compartment 9
An evaporator 13 and a cooling fan 14 are provided behind the evaporator 13 in the partition wall surrounded by. Further, ventilation paths 15 and 16 for introducing cooling air from the evaporator 13 into the respective compartments are formed at the backs of the freezing compartment 8 and the refrigerating compartment 9. Reference numeral 17 is a compressor.

Reference numeral 18 is a freezer compartment temperature sensor. 1
Reference numeral 9 denotes an in-compartment temperature detecting means for electrically converting the output of the freezer compartment temperature sensor 18 and outputting the converted output. Reference numeral 20 is a cooling control means. The cooling control means 20 is provided in the inside temperature detecting means 19
When the output of the second reference temperature storage means 21 reaches the reference value of the first reference temperature storage means 21, the compressor 17 is operated, and the second reference temperature storage means 2 is operated.
When the reference value of 2 is reached, cooling control is performed by stopping.

The operation of the control device for the refrigerator / freezer constructed as described above will be described below with reference to the flowchart of FIG.

First, the inside temperature detecting means 19 detects the inside temperature T of the freezing room by the freezing room temperature sensor 18 and compares it with the reference value T1 of the first reference temperature storing means 21 (step 101) to determine the temperature. If is higher, the compressor 17 is operated in step 102. If the temperature is low in step 101, it is compared with the reference value T2 of the second reference temperature storage means 22 (step 103), and if the temperature is low, step 104.
Then, the compressor 17 is stopped.

[0008]

However, in the above-mentioned configuration, the compressor can be operated in spite of the deterioration of the cooling capacity of the cooling system due to the wear of the driving part in the compressor or the leakage of the refrigerant due to the operation for many years. First reference temperature storage means for storing a reference temperature for operation,
Since the reference value of the second reference temperature storage means does not change and is always a constant value, when the operating load of the compressor increases, the functional parts such as the compressor constituting the cooling system are destroyed and the cooling function stops. There was a problem that it would end up.

The present invention solves the above-mentioned problems, and when the operating load of the compressor is increased despite the reduction of the cooling capacity, the operation of the compressor is reduced to maintain the capacity of the cooling system for a longer period of time. To aim.

[0010]

In order to achieve the above object, a control device for a refrigerator / freezer according to the present invention is a refrigerator / freezer capable of cooling and storing food, and a freezer compartment temperature sensor provided in a refrigerator compartment. A first reference temperature storage means for setting and storing a reference temperature for operating the compressor, and an internal temperature detection means for electrically converting and outputting the internal temperature of the freezer compartment by the freezer temperature sensor. Cooling control means for operating the compressor based on the output of the internal temperature detection means, based on the reference temperature storage means, the reference values stored in the first reference temperature storage means, and the second reference temperature storage means. An operation rate calculating means for calculating an operation rate of the compressor operated by the output of the cooling control means; a reference value storage means for storing a reference value of the operation rate of the compressor; On the basis of the reference value of the operating rate of the compressor stored in the reference value storing means of No. 3, it is stored in the first reference temperature storing means and the second reference temperature storing means by the output of the operating rate calculating means. The reference temperature correction means A for correcting the reference value is provided.

Further, a change rate calculating means for calculating a change rate of the inside temperature by the output of the inside temperature detecting means, and a change rate reference value storing means for storing a reference value of the inside temperature change rate, Based on the reference value of the rate of change of the in-compartment temperature stored in the change rate reference value storage means, the first reference temperature storage means and the second reference temperature storage means are output by the change rate calculation means. And a reference temperature correction means B for correcting the reference value stored in.

Further, the correction value calculated by the reference temperature correction means A and the correction value calculated by the reference temperature correction means B are added to be stored in the first reference temperature storage means and the second reference temperature storage means. And a correction value adding means for correcting the stored reference value.

[0013]

According to the present invention, the reference temperature for operating the compressor is raised when the cooling capacity of the cooling system is lowered and the operating rate of the compressor is high, or when the rate of change of the temperature inside the refrigerator is low. By
The operating load of the cooling system can be reduced.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A freezer-refrigerator controller according to an embodiment of the present invention will be described below with reference to the drawings. The detailed description of the same parts as the conventional one will be omitted.

FIG. 1 is a block diagram of a control device for a refrigerator-freezer showing an embodiment of the present invention, FIG. 2 is a flow chart for explaining the operation of the embodiment of the present invention, and FIG. 3 is a reference for operating a compressor. It is a figure showing the relationship between temperature and the temperature in a warehouse.

In FIG. 1, reference numeral 23 is an operating rate calculating means for calculating the operating rate of the compressor 17. Reference numeral 24 denotes an operating rate reference value storage means for storing the operating rate reference value of the compressor 17. Reference numeral 25 is a reference temperature correction means A, which is based on the reference value stored in the reference value storage means 24 for the operating rate and is output from the operating rate calculating means 23 by the first reference temperature storage means 21 and the second reference temperature. The reference value of the temperature storage means 22 is corrected.

The operation of the control device for the refrigerator / refrigerator constructed as described above will be described below with reference to FIGS. 1, 2, 3 and 10.

Here, step 101 to step 104
Up to the above, the operation is the same as that of the control device of the conventional refrigerator-freezer.

In step 102, the compressor is operated,
Go to step 106. Further, in step 103, the value is compared with the reference value T2 of the second reference temperature storage means 22, and if the temperature is high, it is determined in step 105 whether the compressor 17 is in operation, and if it is in operation, the process proceeds to step 106.

At step 106, the operating rate calculation means 23
Compressor 1 driven by output of cooling control means 20
The operating rate X of 7 is calculated. Here, as shown in FIG. 3A, the operating rate X is the ratio of the operating time (ton) to the one cycle time (ton + toff) of the operation to stop of the compressor, and can be calculated by (Equation 1).

[0021]

[Equation 1]

Next, the reference temperature correction means A25 determines whether the operating rate X obtained by the operating rate calculating means 23 has reached the reference value X0 stored in the operating rate reference value storage means 24. (Step 107). When the reference value X0 is reached, the reference values T1 and T2 in the first reference temperature storage means 21 and the second reference temperature storage means 22 are corrected (step 108). Here, regarding the correction of the reference values T1 and T2,
This is performed by adding the correction values ΔTA1 and ΔTA2 as shown in FIG.

Then, returning to step 101, cooling control is performed based on the corrected reference temperature. Therefore, in the present cooling, the cooling capacity of the cooling system is reduced and the compressor 1
When the operating rate of No. 7 becomes high, the operating rate of the compressor 17 is reduced and the operating load of the cooling system is reduced by raising the reference value of the reference temperature storage means 21, 22 for operating the compressor 17 according to the operating rate. be able to.

Next, another embodiment of a control device for a refrigerating refrigerator for cold storage will be described with reference to the drawings. The detailed description of the same parts as those of the prior art and the first embodiment will be omitted.

FIG. 4 is a block diagram of a control device for a refrigerator / freezer showing another embodiment of the present invention, FIG. 5 is a flow chart for explaining the operation of another embodiment of the present invention, and FIG. It is a figure showing the relationship between the reference temperature and the internal temperature.

In FIG. 4, reference numeral 26 is a change rate calculating means, which calculates the change rate of the internal temperature from the output of the internal temperature detecting means 19. Reference numeral 27 is a reference value storage means for the change rate,
The reference value of the rate of change of the internal temperature is stored. Reference numeral 28 is a reference temperature correction means B, which is based on the reference value stored in the change rate reference value storage means 24, and is output from the change rate calculation means 26 by the first reference temperature storage means 21 and the second reference temperature. The reference value of the temperature storage means 22 is corrected.

The operation of the control device for the refrigerator / refrigerator constructed as described above will be described below with reference to FIGS. 4, 5, 6 and 10.

Here, step 101 to step 104
Up to the above, the operation is the same as that of the control device of the conventional refrigerator-freezer.

In step 102, the compressor is operated,
Go to step 206. Further, in step 103, it is compared with the reference value T2 of the second reference temperature storage means 22, and if the temperature is high, it is judged in step 105 whether the compressor 17 is in operation, and if it is in operation, the routine proceeds to step 206.

In step 206, the change rate calculating means 26
The rate of change in the temperature inside the compartment Y based on the output of the inside temperature detecting means 19
Is calculated. Here, as shown in FIG. 6A, the change rate Y
Is the rate of change of the internal temperature with respect to the operating time (ton) of the compressor, and can be obtained by (Equation 2).

[0031]

[Equation 2]

Next, the reference temperature correction means B28 determines whether or not the change rate Y obtained by the change rate calculation means 26 has reached the reference value Y0 stored in the change rate reference value storage means 27. (Step 207). When the reference value Y0 is reached, the reference values T1 and T2 in the first reference temperature storage means 21 and the second reference temperature storage means 22 are corrected (step 208). Here, the correction of the reference values T1 and T2 is performed by adding the correction values ΔTB1 and ΔTB2 as shown in FIG. 6B.

Then, returning to step 101, cooling control is performed based on the corrected reference temperature. Therefore, in this embodiment, when the cooling capacity of the cooling system is lowered, the cooling speed is slowed down, and the rate of change of the in-compartment temperature becomes low, the reference temperature storage means 2 for operating the compressor 17 according to the rate of change.
By increasing the reference values of 1 and 22, the operating rate of the compressor 17 can be reduced and the operating load of the cooling system can be reduced.

A freezer-refrigerator control device according to still another embodiment will be described with reference to the drawings. Incidentally, detailed description of the same parts as those of the first and second embodiments is omitted.

FIG. 7 is a block diagram of a control device for a refrigerator / freezer showing another embodiment of the present invention, and FIG. 8 is a flow chart for explaining the operation of the other embodiment of the present invention.

In FIG. 7, reference numeral 29 is a correction value adding means, which adds the correction value calculated by the reference temperature correction means A25 and the correction value calculated by the reference temperature correction means B28 to obtain the first reference temperature storage means. 21, the reference value stored in the second reference temperature storage means 22 is corrected.

The operation of the control device for the refrigerator / refrigerator constructed as above will be described below with reference to FIGS. 7, 8 and 10.

Here, step 101 to step 105
Up to this point, the operation is the same as that of the conventional refrigerator-freezer control device and the first embodiment.

At step 106, the operating rate calculation means 23
Compressor 1 driven by output of cooling control means 20
The operating rate X of 7 is calculated. Next, the reference temperature correction means A2
5 determines whether or not the operating rate X obtained by the operating rate calculating means 23 has reached the reference value X0 stored in the operating rate reference value storage means 24 (step 107). When the reference value X0 is reached, the first reference temperature storage means 2
1, correction values ΔTA1, ΔT of the second reference temperature storage means 22
A2 is calculated (step 108).

Further, in step 206, the change rate calculation means 2
6 calculates the rate of change Y of the in-compartment temperature from the output of the in-compartment temperature detecting means 19. Next, the reference temperature correction means B28
It is determined whether or not the rate of change Y calculated by the rate-of-change calculation means 26 has reached the reference value Y0 stored in the reference-value storage means 27 for the rate of change (step 207). And the reference value Y
If it reaches 0, the first reference temperature storage means 21, the second
The correction values ΔTBI and ΔTB2 of the reference temperature storage means 22 are calculated (step 208).

Next, the correction value adding means 29 has the correction values ΔTA1, ΔTA2 calculated by the reference temperature correction means A25 and the correction values ΔTB1, calculated by the reference temperature correction means B28.
ΔTB2 is added to the first reference temperature storage means 21, second
The reference value stored in the reference temperature storage means 22 is corrected (step 301).

Here, regarding the correction of the reference values T1 and T2,
As shown in (Equation 3), the correction value ΔTA1 + is added to the reference values T1 and T2.
This is performed by adding ΔTB1 and ΔTA2 + ΔTB2.

[0043]

[Equation 3]

Then, returning to step 101, cooling control is performed based on the corrected reference temperature. Therefore, in this embodiment, when the cooling capacity of the cooling system is lowered and the operating rate of the compressor is high, or when the rate of change of the internal temperature is low, the standard for operating the compressor 17 according to the operating rate and the rate of change. By raising the reference value of the temperature storage means 21 and 22, the operating rate of the compressor 17 can be reduced and the operating load of the cooling system can be reduced.

[0045]

As described above, according to the present invention, in a freezer-refrigerator capable of cooling and storing food, the freezer compartment temperature sensor provided in the freezer compartment and the freezer compartment temperature by the freezer compartment temperature sensor. Inside temperature detecting means for electrically converting and outputting, a first reference temperature storing means for setting and storing a reference temperature for operating the compressor, a second reference temperature storing means, and the first reference temperature Of the cooling control means for operating the compressor by the output of the internal temperature detection means and the compressor operated by the output of the cooling control means based on the reference value stored in the storage means and the second reference temperature storage means. The operating rate calculation means for calculating the operating rate, the reference value storage means for storing the reference value of the operating rate of the compressor, and the compressor stored in the reference value storage means for the operating rate Based on the reference value of the rotation rate, the first reference temperature storage means by an output of said operating rate calculating means, second
And a reference temperature correction means A for correcting the reference value stored in the reference temperature storage means.

Further, a change rate calculating means for calculating a change rate of the inside temperature based on the output of the inside temperature detecting means, a change rate reference value storing means for storing a reference value of the inside temperature change rate, Based on the reference value of the rate of change of the in-compartment temperature stored in the change rate reference value storage means, the first reference temperature storage means and the second reference temperature storage means are output by the change rate calculation means. And a reference temperature correction means B for correcting the reference value stored in.

Further, the correction value calculated by the reference temperature correction means A and the correction value calculated by the reference temperature correction means B are added to be stored in the first reference temperature storage means and the second reference temperature storage means. And a correction value adding means for correcting the stored reference value.

As a result, when the cooling capacity of the cooling system is lowered and the operating rate of the compressor is high, or when the rate of change of the internal temperature is low, the reference temperature for operating the compressor is raised to increase the compressor. It is possible to reduce the operating load of the.

Therefore, when the cooling capacity is deteriorated due to wear of the driving part in the compressor due to long-term operation or leakage of the refrigerant, functional parts such as the compressor are prevented from being broken and the cooling function is stopped. The capacity of the cooling system can be maintained for a longer period of time.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device for a refrigerator-freezer according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of FIG.

FIG. 3 is a diagram showing a relationship between a reference temperature for operating a compressor and an in-compartment temperature for explaining the embodiment of FIG.

FIG. 4 is a block diagram of a control device for a refrigerator-freezer according to another embodiment of the present invention.

5 is a flowchart for explaining the operation of FIG.

FIG. 6 is a diagram showing a relationship between a reference temperature at which a compressor is operated and an internal temperature for explaining the embodiment of FIG.

FIG. 7 is a block diagram of a control device for a refrigerator-freezer according to another embodiment of the present invention.

8 is a flow chart diagram for explaining the operation of FIG. 7. FIG.

FIG. 9 is a block diagram of a conventional controller for a refrigerator-freezer.

FIG. 10 is a block diagram of a conventional refrigerator-freezer.

FIG. 11 is a flowchart for explaining the operation of the conventional example.

[Explanation of symbols]

 18 Freezing Room Temperature Sensor 19 In-Chamber Temperature Detection Means 20 Cooling Control Means 21 First Reference Temperature Storage Means 22 Second Reference Temperature Storage Means 23 Operation Rate Calculation Means 24 Operation Rate Reference Value Storage Means 25 Reference Temperature Correction Means A 26 change rate calculation means 27 change rate reference value storage means 28 reference temperature correction means B 29 correction value addition means

Claims (3)

[Claims] 1. A freezer-refrigerator capable of cooling and storing food, wherein a freezer compartment temperature sensor provided in the freezer compartment and the freezer compartment temperature sensor electrically convert the inside temperature of the freezer compartment and output the temperature. Internal temperature detection means, first reference temperature storage means for setting and storing reference temperature for operating the compressor, second reference temperature storage means, first reference temperature storage means, second reference temperature Based on the reference value stored in the storage means, a cooling control means for operating the compressor by the output of the internal temperature detection means, and an operation rate calculation for calculating the operation rate of the compressor operated by the output of the cooling control means Means, a reference value storage unit for storing a reference value of the operating ratio of the compressor, and a reference value of the operating ratio of the compressor stored in the reference value storage unit for the operating ratio. A refrigerating refrigerator comprising: a reference temperature correction means A for correcting the reference values stored in the first reference temperature storage means and the second reference temperature storage means according to the output of the operation rate calculation means. Control device. 2. A freezer-refrigerator capable of cooling and storing food, wherein a freezer compartment temperature sensor provided in the freezer compartment and the freezer compartment temperature sensor electrically convert and output the inside temperature of the freezer compartment. Internal temperature detection means, first reference temperature storage means for setting and storing reference temperature for operating the compressor, second reference temperature storage means, first reference temperature storage means, second reference temperature Based on the reference value stored in the storage means, the cooling control means for operating the compressor by the output of the inside temperature detecting means, and the change for calculating the rate of change of the inside temperature by the output of the inside temperature detecting means A rate calculation means, a change rate reference value storage means for storing a reference value of the change rate of the internal temperature, and a reference value of the change rate of the internal temperature stored in the change rate reference value storage means. To
A refrigerating refrigerator comprising: a reference temperature correction unit B that corrects the reference values stored in the first reference temperature storage unit and the second reference temperature storage unit according to the output of the change rate calculation unit. Control device. 3. A freezer-refrigerator capable of cooling and storing foods, wherein a freezer compartment temperature sensor provided in the freezer compartment and the freezer compartment temperature sensor electrically convert the inside temperature of the freezer compartment to output. Internal temperature detection means, first reference temperature storage means for setting and storing reference temperature for operating the compressor, second reference temperature storage means, first reference temperature storage means, second reference temperature Based on the reference value stored in the storage means, a cooling control means for operating the compressor by the output of the internal temperature detection means, and an operation rate calculation for calculating the operation rate of the compressor operated by the output of the cooling control means Means, a reference value storage unit for storing a reference value of the operating ratio of the compressor, and a reference value of the operating ratio of the compressor stored in the reference value storage unit for the operating ratio. Reference temperature correction means A for calculating the correction value of the reference value stored in the first reference temperature storage means and the second reference temperature storage means, and the inside temperature detection means. Change rate calculation means for calculating the change rate of the in-compartment temperature by the output of, change rate reference value storage means for storing the reference value of the change rate of the in-room temperature, and the change rate reference value storage means. Based on the reference value of the change rate of the in-chamber temperature, the correction value of the reference value stored in the first reference temperature storage means and the second reference temperature storage means is output by the change rate calculation means. The reference temperature correction means B to be calculated, the correction value calculated by the reference temperature correction means A and the correction value calculated by the reference temperature correction means B are added, and the first reference temperature storage means and the second reference temperature storage means are added. Supplements the reference value stored in the temperature storage means. Refrigerator control device characterized by an adding means of the correction values.