JPH0719699A - Refrigerator - Google Patents

Abstract

PURPOSE:To enable reduction of nonuniformity in a temperature distribution in a refrigerating chamber and of fluctuation of temperature, in a freezing refrigerator wherein foods are stored. CONSTITUTION:A means 19 for detecting temperatures of a door and a shelf of a refrigerating chamber and a means 20 for detecting the temperature of an outlet of cold of the refrigerating chamber are provided and a temperature difference between the door and the shelf and the outlet of cold is detected. Besides, a control means 23 is provided so as to determine opening and closing of a motor operated damper 12, the number of revolusions of a blower 10 and the number of revolutions of a compressor 8. According to a command from the control means 23, a motor driven damper opening-closing control means 24a opens and closes the motor driven damper 12 and a blower operation control means 25 makes the blower 10 operate in the determined number of revolutions, while a compressor operation control means 26 makes the compressor 8 operate in the determined number of revolutions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to refrigerator operation control.

[0002]

2. Description of the Related Art An example of a conventional refrigerator is disclosed in Japanese Utility Model Laid-Open No. 58-041464, and its configuration will be described below with reference to FIG.

Reference numeral 1 denotes a refrigerator body, which is composed of an outer box 2, an inner box 3, an outer box 2, and a heat insulating material 4 filled between the inner boxes 3. Reference numeral 5 denotes a partition wall that divides the interior of the refrigerator body 1 into upper and lower parts, and is formed by partitioning the freezing compartment 6 at the upper part and the refrigerating compartment 7 at the lower part. Reference numeral 8 denotes a refrigeration cycle compressor housed in the bottom rear portion of the refrigerator body 1. Reference numeral 9 denotes a cooler for the refrigeration cycle housed in the back surface of the freezer compartment 6, and 10 denotes a blower for forcibly ventilating the cool air cooled by the cooler 9 into the freezer compartment 6 and the refrigerating compartment 7. Reference numeral 11 is a duct for guiding cold air to the freezer compartment 6 and refrigerating compartment 7, and 12 is a damper device (hereinafter referred to as an electric damper 12) installed at an inlet of the refrigerating compartment 7 to adjust the amount of cold air inflow by electric input.
That is). Reference numerals 13 and 14 denote temperature sensors provided inside the freezing compartment 6 and the refrigerating compartment 7, respectively.

The operation of the above arrangement will be described below. Normally, the temperature sensor 13 provided in the freezer compartment 6
The compressor 8 and the blower 10 are turned on / off based on the set value of
The chilled air that has been FF and cooled by the cooler 9 is blower 1
0 is blown to cool the freezing compartment 6 and the freezing compartment 15 so as to maintain a constant temperature (for example, −20 ° C.). On the other hand, the cool air blown by the blower 10 is sent through the duct 11 to the refrigeration chamber
Also, the electric damper 12 regulates the inflow amount of cold air and cools it so as to maintain a constant temperature (for example, 4 ° C.).

[0005]

However, in the above-mentioned configuration, the inside of the freezing compartment 6 or the refrigerating compartment 7 is subject to heat load such as defrosting of the cooler 9, opening / closing of the door, or storing food before cooling. If the temperature sensor 13 detects a temperature higher than the ON set temperature for the freezer compartment 6 when the temperature rises,
When the compressor 8 and the blower 10 start operating and the temperature sensor 14 detects a temperature equal to or higher than an ON set temperature for the refrigerating compartment 7, the electric damper 12 is opened. However, due to the heat load such as opening and closing the door of the refrigerating room 7 and storing food before cooling, the temperature inside the refrigerating room 7 is relatively large and the temperature around the temperature sensor 14 becomes lower than the set temperature before the room temperature becomes uniform. There was a drawback in that the temperature of the door shelf was detected and the electric damper was closed, and the temperature of the door shelf was likely to rise. Therefore, the food is stored while the temperature distribution in the refrigerating compartment 7 is not uniform, and the temperature in the refrigerating compartment 7 may fluctuate, so that the quality of the food during storage is deteriorated. was there.

In view of the above problems, the present invention eliminates the uneven temperature distribution inside the refrigerating compartment 7 even if a heat load is applied to the refrigerating compartment 7, and saves the food stored in the refrigerating compartment 7 so that the quality of the stored food is reduced. It is intended to be possible.

[0007]

In order to solve the above-mentioned problems, a refrigerator-freezer of the present invention detects a temperature of a cold air outlet and a temperature of a door shelf in a refrigerating room and detects a temperature difference between the compressor and a blower. Operation control means for determining and operating the rotation speed of
An opening / closing control means for instructing opening / closing of the damper device is provided.

Further, it is characterized in that a fan dedicated to agitating cold air in the refrigerating room is provided, and control means for instructing to turn on / off in conjunction with opening / closing of the damper device is provided.

[0009]

According to the present invention, with the above-mentioned structure, the rotation speed of the compressor and the blower can be changed by the temperature difference detecting means between the temperature of the cold air in the refrigerating room and the temperature of the door shelf, and the opening and closing of the electric damper can be instructed. As a result, the temperature distribution in the refrigerating compartment becomes uniform, the temperature rise of the door shelf is suppressed, and the temperature fluctuation of the food in the refrigerating compartment is also suppressed.

Further, by providing a fan dedicated to agitating cold air in the refrigerating compartment and turning it on / off in conjunction with opening / closing of the damper device, the temperature distribution in the refrigerating compartment can be more efficiently equalized.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. Further, in the figure, the same parts as those in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a vertical sectional view of a freezer-refrigerator according to a first embodiment of the present invention, in which 15 is a temperature sensor for detecting the temperature of the cold air outlet of the refrigerating compartment 7, and 16 is the door shelf temperature of the refrigerating compartment 7. Is a temperature sensor that detects the temperature, 17 is a frost amount detection sensor attached to the cooler 9, and 18 is a temperature sensor that detects a temperature rise of the cooler 9 during defrosting. 2 is a block diagram of an operation control device for a refrigerator-freezer in the same embodiment of the present invention, and FIG. 3 is a functional block diagram showing the function of the control means in FIG. FIG. 4 is a flow chart showing the operation of the embodiment.

In FIG. 2, 19 is a door shelf temperature detecting means for detecting the temperature of the door shelf of the refrigerating compartment 7, 20 is an outlet temperature detecting means for detecting the temperature of the cold air outlet of the refrigerating compartment 7,
Reference numeral 21 is a defrosting start detecting means that detects the amount of frost on the cooler 9 by the frost amount detecting sensor 17 and sends out a defrosting start signal when the amount of frost has become a certain amount.

Reference numeral 22 indicates the temperature rise of the cooler 9 during defrosting.
Defrosting end detected by sensor 18 and sending defrosting end signal
It is a completion detection means. 23 is a control means, which is an input terminal I₁，
I₂, I₃, I_Four, Output terminal O₁, O₂, O₃, O_FourTo
Has input terminal I₁, I ₂, I₃, I_FourEach is a door shelf
Temperature detecting means 19, outlet temperature detecting means 20, defrost
It is connected to the starter 21 and the defrosting end detector 22.
It

The output terminal O ₁ is connected to the opening / closing control means 24a for opening and closing the electric damper 12, O ₂ is connected to the operation control means 25 for operating the blower 10, and O ₃ is connected to the operation control means 26 for operating the compressor 8. O ₄ is connected to a relay 27 for energizing the heater 28 during defrosting, and the relay 27 has a contact 27 ′.

FIG. 3 is a functional block diagram showing the function of the control means 23 in FIG. 2, and 29 is the input terminals I ₁ , I.
It is a temperature difference detecting means for detecting the difference between the door shelf temperature of the refrigerating room 7 and the temperature of the cold air outlet from ₂ . Reference numeral 30a is an electric damper determination means that determines the opening / closing of the electric damper 12 based on the output from the temperature difference detection means 29, and 31 is a rotation speed determination that determines the rotation speed of the blower 10 based on the output from the temperature difference detection means 29. Reference numeral 32 is a rotation speed determining means for determining the rotation speed of the compressor 8 based on the output from the temperature detecting means 29. Reference numeral 33 is a defrost control means for controlling the start and end of defrost from the input terminals I ₃ and I ₄ .

Reference numeral 34a designates an electric damper opening / closing determining means 30a.
Select either output according to the output from
₁ is output, and 35 is selected from the output of the blower rotation speed determining means 31 and output from the output terminal O ₂ , and 36 is output from the compressor rotation speed determining means 32. The output is selected and output from the output terminal O ₃ . At this time, the electric damper opening / closing means 30a, the blower rotation speed determining means 31, and the compressor rotation speed determining means 32 have a rotation speed table determined by the temperature difference. For example, as shown in (Table 1).

[0018]

[Table 1]

Defrosting output means 37 receives a command from the output from the defrosting control means 33. During defrosting, the compressor rotation speed output means 36 outputs a command of rotation speed 0 to the output terminal O.
It is output from ₄ .

Next, the operation will be described with reference to the flowchart of FIG. In Step 1 in FIG. 4, the output of the defrosting start detection means 21 is input to the input terminal I ₃ , and it is determined whether the input defrosting start output starts defrosting.
If defrosting has not started, the process proceeds to Step 2, the refrigerating compartment door shelf temperature detecting means 19 and the refrigerating compartment outlet temperature detecting means 20 detect the respective temperatures, and in Step 3,
The temperature difference between the door shelf temperature of the refrigerator compartment 7 and the outlet temperature is detected.

The electric damper opening / closing determining means 3 is determined based on the temperature difference detected in Step 3 in Step 4.
0a determines the opening / closing of the electric damper 12, the blower rotation speed determination means 31 determines the rotation speed of the blower 10, and the compressor rotation speed determination means 32 determines the rotation speed of the compressor 8.

At this time, the electric damper 12 is open when the temperature difference is large, and the electric damper 12 is closed when the fan 10 and the compressor 8 have a high rotation speed and are small, and the fan 10 and the compressor 10 are closed.
The compressor 8 also has a low rotation speed. In Step 5, Step 5
The opening / closing of the electric damper 12 determined in step 4 is input to the electric damper opening / closing output means 34a, and output from the output terminal O ₁ to the electric damper opening / closing control means 24a.
The electric damper opening / closing control means 24a is the electric damper 12.
Is controlled by the determined opening or closing command.

The rotation speed of the blower 10 is input to the blower rotation speed output means 35, and is output from the output terminal O ₂ to the blower operation control means 25. The blower operation control means 25 operates the blower 10 at the determined rotation speed. The rotation speed of the compressor 8 is input to the compressor rotation speed output means 36, and the output terminal O
Output from the compressor ₃ to the compressor operation control means 26. The compressor operation control means 26 operates the compressor 8 at the determined rotation speed.

Next, in Step 1, when the defrosting control means 33 determines to start defrosting, the process proceeds to Step 6.
Here, the compressor rotation speed output means 36 outputs the rotation speed 0 from the output terminal O ₃ to the hand compressor operation control means 26, and the compressor 8 is turned off. In Step 7, defrost output means 37
Outputs from the output terminal O ₄ , turns on the relay 27, energizes the heater 28, and starts defrosting.

Next, in Step 8, the output of the defrosting completion detecting means 22 is input from the input terminal I ₄ and it is judged whether or not the defrosting is completed. If the defrosting is not completed, the defrosting completion detecting means 22 is again operated. Input the output from the input terminal I ₄ . If the defrosting has ended, the defrosting control means 33 determines in step 9 that the defrosting has ended, turns off the output terminal O ₄ , and relays 27.
Is turned off, the energization of the heater 28 is stopped, and Step1
Return to.

In this way, even when a relatively large heat load such as opening and closing of the door or storing food is applied to the refrigerating compartment 7, the cooling capacity is automatically increased, and the temperature rise of the door shelf, which is particularly large, rises. Is suppressed, equalization of the temperature distribution in the refrigerating compartment 7 is promoted, and the refrigerating compartment 7 is temperature-controlled. As a result, the food stored in the refrigerating compartment 7 can be refrigerated with less deterioration in food quality due to uneven temperature, and the temperature rise in the refrigerating compartment 7 can be suppressed.
Propagation of bacteria and enzyme activity in the refrigerating compartment 7 are also suppressed, and deterioration of food quality is suppressed.

Next, a second embodiment according to the present invention will be described with reference to the drawings. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 5 is a vertical sectional view of a refrigerator-freezer according to a second embodiment of the present invention, in which 38 is a fan for cooling cold air in a refrigerating compartment. FIG. 6 is a block diagram of the operation control device for the refrigerator / freezer in the same embodiment of the present invention, and FIG. 7 is a functional block diagram showing the function of the control means in FIG. FIG. 8 is a flowchart showing the operation of the embodiment.

In FIG. 6, 19 is a door shelf temperature detecting means for detecting the temperature of the door shelf of the refrigerating compartment 7, 20 is an outlet temperature detecting means for detecting the temperature of the cool air outlet of the refrigerating compartment 7,
Reference numeral 21 is a defrosting start detecting means that detects the amount of frost on the cooler 9 by the frost amount detecting sensor 17 and sends out a defrosting start signal when the amount of frost has become a certain amount.

Reference numeral 22 is a defrosting end detecting means for detecting the temperature rise of the cooler 9 by the temperature sensor 18 at the time of defrosting, and sending out a defrosting end signal. 23 is a control means, and input terminals I ₁ , I
₂ , I ₃ , I ₄ , output terminals O ₁ , O ₂ , O ₃ , O ₄ , and input terminals I ₁ , I ₂ , I ₃ , I ₄ are door shelf temperature detecting means 19 and outlet, respectively. It is connected to the temperature detection means 20, the defrosting start means 21, and the defrosting end detection means 22.
Further, the output terminal O ₁ is to the control means 24b for controlling the opening / closing of the electric damper 12 and the ON / OFF of the fan 38 dedicated to refrigerating room cold air stirring, O ₂ is the operation control means 25 for operating the blower 10, and O ₃ is the compression. Operation control means 26 for operating the machine 8
In addition, O ₄ is connected to a relay 27 for energizing the heater 28 during defrosting, and the relay 27 has a contact 27 ′.

FIG. 7 is a functional block diagram showing the function of the control means 23 in FIG. 6, and 29 is the input terminals I ₁ , I.
It is a temperature difference detecting means for detecting the difference between the door shelf temperature of the refrigerating room 7 and the temperature of the cold air outlet from ₂ . Reference numeral 30b is an electric damper opening / closing and refrigerating compartment fan ON / OFF determining means for determining opening / closing of the electric damper 12 and ON / OFF of the fan 38 for exclusive use of refrigerating room cold air agitation based on an output from the temperature difference detecting means 29, and 31 is a temperature. By the output from the difference detecting means 29,
It is a rotation speed determination unit that determines the rotation speed of the blower 10,
Reference numeral 32 is a rotation speed determining means for determining the rotation speed of the compressor 8 based on the output from the temperature detecting means 29.

Reference numeral 33 is a defrost control means for controlling the start and end of defrost from the input terminals I ₃ and I ₄ . 34b selects either output by the electric damper opening / closing or the output from the refrigerating compartment fan ON / OFF determining means 30b and outputs it from the output terminal O ₁ , and 35 outputs by the output of the blower rotation speed determining means 31. Output from the output terminal O ₂ , and 36 is the compressor speed determining means 32.
Either output select output from the output terminal O ₃ from the output of.

At this time, the electric damper opening / closing / refrigerating room fan ON / OFF determining means 30b, the blower rotation speed determining means 31, and the compressor rotation speed determining means 32 have a table of rotation speeds determined by the temperature difference. For example, as shown in (Table 2).

[0034]

[Table 2]

Defrosting output means 37 receives a command from the output from the defrosting control means 33. When defrosting, the compressor rotation speed output means 36 outputs a command of rotation speed 0 to the output terminal O.
It is output from ₄ .

Next, the operation will be described with reference to the flowchart of FIG. In Step 1 in FIG. 8, the output of the defrosting start detecting means 21 is input to the input terminal I ₃ , and it is determined whether the input defrosting start output starts defrosting.
If the defrosting has not started, the process proceeds to Step 2, the refrigerating compartment door shelf temperature detecting means 19 and the refrigerating compartment outlet temperature detecting means 20 detect the respective temperatures, and in step 3, the refrigerating compartment 7 door shelf temperature and the outlet. Detect the temperature difference.

The electric damper opening / closing / refrigerating compartment fan ON / OFF determining means 30b determines opening / closing of the electric damper 12 and ON / OFF of the refrigerating compartment cold air stirring fan 38 based on the temperature difference detected in Step 3 in Step 4. The blower rotation speed determination means 31 determines the rotation speed of the blower 10, and the compressor rotation speed determination means 32 determines the rotation speed of the compressor 8.

At this time, when the temperature difference is large, the electric damper 12 is opened, and the fan 38 dedicated to stirring cold air in the refrigerating room is turned on.
Then, both the blower 10 and the compressor 8 have a high rotation speed, and when the temperature difference is small, the electric damper 12 is closed, the cool air agitation fan 38 in the refrigerating compartment is OFF, and both the blower 10 and the compressor 8 have a low rotation speed. .

At Step 5, the opening / closing of the electric damper 12 determined at Step 4 is input to the electric damper opening / closing, refrigerating compartment fan ON / OFF output means 34b, and the electric damper opening / closing / refrigerating compartment fan O is output from the output terminal O _1.
Output to the N / OFF control means 24b. The electric damper opening / closing / refrigerating compartment fan ON / OFF control means 24b controls the electric damper 12 and the refrigerating compartment cold air agitating fan 38 according to the determined command. The rotation speed of the blower 10 is input to the blower rotation speed output means 35, and is output to the blower operation control means 25 from the output terminal O ₂ . The blower operation control means 25 operates the blower 10 at the determined rotation speed.

The rotation speed of the compressor 8 is input to the compressor rotation speed output means 36, and the compressor operation control means 2 is output from the output terminal O _3.
Output to 6. The compressor operation control means 26 operates the compressor 8 at the determined rotation speed.

Next, in Step 1, when the defrosting control means 33 determines to start defrosting, the process proceeds to Step 6.
Here, the compressor rotation speed output means 36 outputs the rotation speed 0 from the output terminal O ₃ to the hand compressor operation control means 26, and the compressor 8 is turned off. In Step 7, defrost output means 37
Outputs from the output terminal O ₄ , turns on the relay 27, energizes the heater 28, and starts defrosting. Next, in Step 8, the output of the defrosting completion detecting means 22 is input from the input terminal I ₄ and it is judged whether or not the defrosting is completed. If the defrosting is not completed, the output of the defrosting completion detecting means 22 is input again. Terminal I ₄
Enter more. If the defrosting has ended, in Step 9, the defrosting control means 33 determines the end of defrosting, the output terminal O ₄ is turned off, the relay 27 is turned off, the energization of the heater 28 is stopped, and the process returns to Step 1. .

In this way, there is a fan 38 dedicated to agitating the cold air in the refrigerating compartment 7, which is turned on / off in conjunction with opening / closing of the refrigerating compartment damper device (electric damper 12), whereby the temperature inside the refrigerating compartment 7 is further increased. The distribution can be efficiently temperature-equalized.

[0043]

As described above, according to the refrigerator of the present invention, the following effects can be obtained.

(1) In the refrigerating room, the temperature rise of the door shelf, which has a particularly large temperature rise, is suppressed, the growth of bacteria and the enzyme activity due to the temperature rise are suppressed, and the refrigerated storage with less deterioration of food quality becomes possible. The uniform temperature distribution in the room also reduces the deterioration of food quality due to the uneven temperature distribution.

(2) By providing a fan dedicated to stirring cold air in the refrigerating room, which is turned on / off in conjunction with opening / closing of the damper device in the refrigerating room, the temperature fluctuation in the refrigerating room can be suppressed more efficiently, and the temperature distribution It is possible to promote equalization and suppress deterioration of food quality.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a refrigerator-freezer showing a first embodiment of the present invention.

FIG. 2 is a block diagram of an operation control device for the refrigerator-freezer in FIG.

FIG. 3 is a functional block diagram showing the function of the control means in FIG.

FIG. 4 is a flowchart for explaining the operation in the embodiment.

FIG. 5 is a vertical sectional view of a refrigerator-freezer showing a second embodiment of the present invention.

FIG. 6 is a block diagram of an operation control device for the refrigerator-freezer in FIG.

FIG. 7 is a functional block diagram showing the function of the control means in FIG.

FIG. 8 is a flowchart for explaining the operation in the same embodiment.

FIG. 9 is a vertical sectional view of a conventional refrigerator.

[Explanation of symbols]

6 Freezer 7 Refrigerator 8 Compressor 9 Cooler 10 Blower 12 Electric damper (Damper device) 15 Refrigerator door shelf temperature sensor 16 Refrigerator cool air outlet temperature sensor 19 Refrigerator door shelf temperature detection means 20 Refrigerator outlet temperature Detecting means 23 Control means 24a Electric damper opening / closing control means 24b Electric damper opening / closing, refrigerating compartment fan ON / OFF
Control means 25 Blower operation control means 26 Compressor operation control means 38 Fan for cold air agitation in refrigerating room

Claims (2)

[Claims] 1. A compressor, a cooler, a freezer compartment, a refrigerating compartment, a blower for forcedly blowing the cool air cooled by the cooler to the freezer compartment and the refrigerating compartment, and a damper for adjusting the amount of cold air inflow. A device, a temperature sensor provided at the cold air outlet of the refrigerating compartment, a temperature detecting means for detecting the temperature in the refrigerating compartment by the outlet temperature sensor, a temperature sensor provided at the door shelf, and the door shelf temperature sensor. By inputting from the temperature detecting means for detecting, the outlet temperature detecting means and the door shelf temperature detecting means, the opening / closing of the damper device, the rotation speed of the compressor and the rotation speed of the blower are determined and sent out. Control means, opening / closing control means for the damper device determined by the control means, and operation control means for rotating the compressor and the blower at the rotation speed determined by the control means. Refrigerator consisting of and. 2. A compressor, a cooler, a freezer compartment, a refrigerating compartment, a blower for forcedly blowing the cool air cooled by the cooler to the freezer compartment and the refrigerating compartment, and a damper for adjusting the amount of cold air inflow. Device, a fan dedicated to a refrigerating room that interlocks with the damper device, a temperature sensor provided in a cool air outlet, a temperature detecting unit that detects the temperature in the refrigerating room by the outlet temperature sensor, and a temperature sensor provided on a door shelf And a temperature detecting means for detecting the door shelf temperature sensor, an input from the outlet temperature detecting means and the door shelf temperature detecting means to open / close the damper device, and to interlock with opening / closing of the damper device. Turn on the fan for the cold room
/ OFF, control means for determining the rotation speed of the compressor and rotation speed of the blower, opening / closing of the damper device and ON / O of the fan exclusively for the refrigerating room, which are determined by the control means.
A refrigerator comprising FF control means and operation control means for rotating the compressor and the blower at the rotation speed determined by the control means.