JPH06241638A - Controlling device of temperature of freezing chamber of refrigerator - Google Patents

Abstract

PURPOSE:To make it possible to execute a temperature control of a freezing chamber more finely than usual by changing a control differential of the temper ature control of the freezing chamber by a temperature width control part on the basis of an operation cycle time of a compressor measured by a cycle time measuring part and an operation rate measured by an operation rate measuring part. CONSTITUTION:Based on changes in an operation cycle time and an operation rate, a control differential (prescribed temperature width) of a temperature control of a freezing chamber is changed by a temperature width control part 55. Thereby the control differential can be set properly on the basis of an operation cycle time T1 of a compressor measured by a cycle time measuring part 56 and an operation rate T2 measured by an operation rate measuring part 57 and thus the temperature control of the freezing chamber can be executed much more finely than usual. Accordingly, a temperature effect on a refrigerating chamber and a ice temperature chamber can be made small and execution of a very fine temperature of the whole of a refrigerator is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator freezer temperature controller for changing the control temperature range in the temperature control of the freezer based on the operating rate of the compressor and the on / off cycle time.

[0002]

2. Description of the Related Art Prior to the present invention (i) JP-A-2-115
The control device for the cooling device disclosed in Japanese Patent No. 674 controls the operation of the compressor within a predetermined temperature range based on the detected temperature of the space. Further, this control device, when the operating rate of the compressor determined by the ratio of the operating period of the compressor and the sum of the operating period and the stop period is smaller than a predetermined operating rate set in advance, the predetermined temperature range is set. Is configured to expand.

Further, prior to the present invention (ii) JP-A-56-
Japanese Patent No. 130573 discloses a control device which is provided with a sensor for detecting the outside air temperature, and expands a predetermined temperature range when the outside air temperature is low to extend the stop period of the compressor.

[0004]

According to the above publication (i), when the predetermined temperature range is adjusted, the operating rate of the compressor is measured and the measured operating rate becomes smaller than the predetermined operating rate. In this case, the control differential is expanded by this expansion operation in order to expand the specified temperature range (although the operating rate of the compressor after changing this temperature range tends to be higher than the specified operating rate), the next operating rate If it is confirmed that the operation rate is higher than the predetermined operation rate, the control differential is reduced. Therefore, in the control operation of expanding the predetermined temperature range when the operation rate is smaller than the predetermined operation rate, the temperature range may increase or decrease with each on / off cycle of the compressor. There was a problem that the temperature of the freezer compartment was difficult to stabilize due to the increase / decrease operation, and the temperature effect on other storage compartments could not be ignored.

On the other hand, in the control device of the publication (ii), not only the number of outside air temperature sensors increases, but also a large heat load (for example, warm food) is stored in the refrigerator when the outside air temperature is low. Despite the need for cooling, because the outside temperature is low, the control temperature range is large and it is easy to delay the return to cooling operation, so the ambient temperature rose and it was stored in the surrounding food and other storage rooms. There were problems such as deterioration of food quality.

In view of this, the present invention provides a refrigerator freezer temperature control device for automatically controlling the temperature differential in the control means for controlling the operation of the compressor based on both the operating rate of the compressor and the on / off cycle time. The purpose is to provide.

[0007]

SUMMARY OF THE INVENTION According to the present invention, an operation start temperature at which a compressor is operated in a predetermined temperature range based on a set temperature set by a temperature setting means for setting the temperature of a freezing room and the compressor is stopped. Based on the control temperature setting unit that determines the operation stop temperature, and the freezing room temperature detected by the temperature detection means that detects the operation start temperature and the operation stop temperature and the temperature of the freezing room set by the control temperature setting unit In a refrigerator provided with a control means for controlling the operation of the compressor, the control means comprises a cycle time measuring section for measuring the time from the start of operation of the compressor to the start of the next operation, and the operation time of the compressor and An operation rate measuring unit that measures the stop time and calculates the operation rate of the compressor, and a temperature width control unit that changes the predetermined temperature width based on the cycle time and the operation rate measured by both measurement units. Example was is intended to provide a refrigerator of the freezer compartment temperature control device.

[0008]

Since the temperature range control unit changes the predetermined temperature range (determined by the operation start temperature-operation stop temperature), the freezing is performed based on the operation cycle time and operation rate of the compressor measured by the measurement unit. The temperature differential in the room temperature control can be appropriately set, the temperature of the freezing room can be controlled extremely finely, and the temperature influence on the refrigerating room and the ice greenhouse can be reduced.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a household refrigerator, and this refrigerator 1 is composed of a heat insulating box 2 having a front opening which constitutes its main body, and doors 3, 4, 5, 6, 7, 8 which close the opening.

Reference numeral 11 denotes a horizontal partition wall which divides the inside of the heat insulating box 2 into upper and lower parts. In this embodiment, the upper part of the horizontal partition wall 11 is a freezing chamber 12 which is cooled to a freezing temperature, and the lower part is a temperature at which food is not frozen. The storage room is to be cooled. The storage chamber is further divided into upper and lower parts by a pre-partition member 13 and a partition plate 14, a refrigerating chamber 15 in which the upper part of the partition plate 14 is cooled to a temperature of about 3 ° C., and the lower part is a temperature zone of about 1 ° C. to 7 ° C. The temperature is set in the selection chamber 16.

The doors 3 and 4 are rotatable doors corresponding to the freezing compartment 12, and the door 4 is provided with a partition body 17 for partitioning the opening of the freezing compartment into left and right. The doors 5 and 6 are pivotable doors corresponding to the refrigerating compartment 15, and the door 6 is provided with a partition 18 for partitioning the opening of the refrigerating compartment into left and right.

The doors 7 and 8 are drawer-type doors corresponding to the bottle room and the vegetable room, which are partitioned by the vertical partition wall 30 into the left and right sides in the selection room 16, and both doors mainly store the bottle and the vegetable, respectively. Container 2 with a top opening
1, 22 are detachably provided.

At the back of the freezer compartment 12 is a cooler compartment formed by a cooler cover 31 and a heat insulating box 2. In this cooler compartment, a plate fin type evaporator (not shown) as a cooler and A blower (not shown) such as a sirocco fan is arranged. The cooler chamber communicates with the freezing chamber 12 at the outlets 32, 33, 34 formed in the cover 31, while
A duct (not shown) communicates with the refrigerator compartment 15 at the rear of the horizontal partition wall 11.

The freezer compartment 12 is divided into upper, middle and lower three stages by two shelves 35 and 36, and the lower stage is divided into left and right by a vertical partition plate 37. An automatic ice making machine 38 is arranged at the rear part on the left side of the middle stage, and this rear space is called an ice making chamber 39. The ice making chamber is covered with an ice making machine cover 40 and is partitioned from the front part on the left side of the middle stage. Furthermore, vertical partition plate 3
In the space on the left side of 7, a container for storing ice made by an automatic ice making machine is arranged so that it can be freely taken in and out.

In the space on the right side of the vertical partition plate 37, a container composed of a bottom plate, left and right side plates and a back plate is arranged so as to be able to be taken in and out with a space from the upper surface of the horizontal partition wall 11 serving as the bottom wall of the freezer compartment.
A quick freezing chamber 44 is formed that is cooled by the cold air blown out from the air outlet 34. For the bottom plate of this container, a metal plate having good thermal conductivity such as aluminum is adopted. The cool air blown into the freezer compartment 12 returns to the lower part of the cooler compartment through the cool air return path 42 formed by the bottom plate of the container and the horizontal partition wall 11. Further, for convenience of the following description, the freezing chambers other than the quick freezing chamber 44 will be referred to as the first freezing chamber 43.

In the first freezer compartment 43, two temperature sensors for detecting the temperature are provided, and one of the two is provided as a main freezer compartment temperature sensor provided in the vicinity of the air outlet 33. A temperature sensor 45 (hereinafter referred to as an F sensor), and the other of the two is a sub-temperature sensor 46 provided near the ice tray in the ice making chamber 39. In addition, the quick freezing chamber 44
Is provided with a quenching chamber temperature sensor 47 near the outlet 34 and a load temperature sensor 48 that comes into contact with the bottom surface of the bottom plate of the container.

Directly below the horizontal partition wall 11, the temperature control width is narrow and the temperature immediately before the food is frozen, that is, the ice temperature (eg -1).
An ice greenhouse 49 is formed which is maintained at a temperature of about ° C. The cooler chamber is also in communication with the ice greenhouse 49 via a duct by an opening formed in a duct (not shown). The supply of cold air to the ice greenhouse 49 is controlled by an ice greenhouse cold air control device (hereinafter simply referred to as H damper) including an ice temperature damper provided in the middle of the duct. Also refrigeration room 1
Cooling air is supplied to 5 by a refrigerating room cold air control device (not shown) including a refrigeration damper provided in the middle of a duct (not shown).
Are controlled by.

Explaining the structure of an H damper (not shown), a baffle for opening and closing the opening formed in the duct, a motor as a drive source for this baffle, and the rotation of this motor is one cycle of closing → opening → closing of the baffle. Power conversion means for converting the opening / closing operation of the power conversion means, and position detection means for outputting a signal (hereinafter, this signal will be referred to as a position detection signal) in a portion corresponding to the fully closed position of the baffle in one cycle operation of the power conversion means This H damper is equipped with
The operation is controlled based on a control signal from the ice greenhouse temperature control device.

Next, the freezer compartment temperature control device 51 will be described with reference to the block circuit diagram of FIG. Freezer temperature control device 51
Is a temperature setting means 52 for setting the temperature of the freezing compartment, a main temperature sensor (hereinafter referred to as F sensor) 45 as a freezing compartment temperature sensor for detecting the temperature of the freezing compartment, and the setting set by the temperature setting means 52. A control temperature setting unit 53 that automatically sets the operation start temperature A and operation stop temperature C of the compressor based on the temperature, and a compressor and a blower based on signals from the control temperature setting unit 53 and the main temperature sensor 45. (F fan) 58 and a control means 54 for controlling the stop of the operation.

There are several methods for setting the temperature in the control temperature setting section 53. In this embodiment, for example, when the set temperature is -18 ° C and the control differential B is 5 ° C, the operation of the compressor is started. Temperature A is -15.5
C, the operation stop temperature C is automatically set to -20.5C. The control differential B is appropriately modified by the temperature range control unit 55 described later.

The control means 54 turns on the operation start signal (hereinafter ON) based on the temperature F of the freezer compartment detected by the main temperature sensor 45 and the operation start temperature A and operation stop temperature C set by the control temperature setting section 53. Signal) and an operation stop signal OFF (hereinafter referred to as an OFF signal), and an operation start signal O from the temperature width control unit 55.
Based on N (that is, the ON signal), the ON time and the OFF signal from the cycle time measuring unit 56 and the temperature width control unit 55 that measure the time until the next ON signal is output (this is called the ON / OFF cycle time) On the basis of this, the operating rate measuring unit 57 calculates the operating rate of the compressor by measuring the operating time and the stop time of the compressor.

The cycle time measuring unit 56 subtracts 1 from the timer T1 (the initial value is set to 50 minutes in this embodiment) when an ON signal is input. The operating rate measuring unit 57 adds 2 to the timer T2 (initial value is 0) when an ON signal is input, and subtracts 1 from the timer T2 when an OFF signal is input. Where O
When the number of N signals is m and the number of OFF signals is n, the timer T2 calculates (2m-n), and the operating rate U (%) of the compressor at this time is U = 100m / (m + n). Also, T2 = 0 is due to m = 1/3 and n = 2 /
3, the operating rate U0 at this time (this is the predetermined operating rate U0) is about 33%. Therefore, due to the magnitude relationship between T2 and 0, the operating rate U is 3 when T2 ≦ 0.
It is 3% or less, and when T2> 0, it is derived that the operating rate U exceeds 33%.

On the other hand, the temperature range control unit 55, based on the output T1 from the cycle time measuring unit 56 and the output T2 from the operating rate measuring unit 57, the control differential B (that is, a predetermined temperature) in the control temperature setting unit 53. It also has a function to increase or decrease the width. That is, the output T1 from the cycle time measuring unit 56 has a lower limit time (30 minutes in this example) for reducing the control differential B or an upper limit time (5 in this example for increasing the control differential B).
0 minute), while the output T from the operating rate measuring unit 57
2 is compared with a value 0 indicating a predetermined operation rate U0 (33%), and the control differential B is increased / decreased according to the results of both comparisons. In this embodiment, in order to give priority to the output of the cycle time measuring unit 56 over the output of the operating rate measuring unit 57, confirmation is performed as shown in the explanation of the operation flow (particularly step S28) described later.

Based on the above construction, the flow of operation of the freezer compartment temperature control device 51 will be described with reference to the flow charts of FIGS. First, when the power is turned on, the control differential B is set to an initial value (5 deg in this example) in step S1, and the freezing room temperature F detected by the main temperature sensor (F sensor) is started in step S2. Temperature A (In this example, the initial value of B is 5 deg.
2.5 ° C.) or higher. If it is A or higher, the process proceeds to step S5, and if it is lower than A, the freezing room temperature F is the operation stop temperature C (in this example, the initial value of B is 5de
Since it is g, it is judged whether it is more than the set temperature −2.5 ° C.), and C
If it is above, the process proceeds to step S5, and if it is less than C, an OFF signal is output from the temperature width control unit 55 to stop the compressor and the F fan at step S4, and then step S4.
Go to 17.

In step S5, it is judged whether or not the operation start signal (ON signal) of the compressor is output. If it is output, the process proceeds to step S17. If it is not output, the ON signal is output in step S6. Then, in step S7, the timer T1 is set to an initial value (upper limit time of 50 minutes), in step S8 (operation start temperature A-control differential B) is input as the operation stop temperature C, and in step S9, the timer T2 is set. To reset.

In the next step S10, it is determined whether or not the flag F1 is set. If F1 is set, the process proceeds to step S13. If F1 is not set, the flag F2 is set in step S14. If F2 is set, step S is performed.
If the flag F3 is not set in step S12, the process proceeds to step S17. If F3 is not set, the process proceeds to step S17. If F3 is set, the process proceeds to step S13. Move to.

In step S13, it is determined whether the control differential B is equal to 7, and if it is equal to 7, the process proceeds to step S17, and if it is not equal to 7, step S1.
In step 4, the control differential B is increased by 1 deg, and the process proceeds to step S17. Further, in step S15, it is determined whether the control differential B is equal to 5,
If it is equal to 5, the process proceeds to step S17. If it is not equal to 5, the control differential B is decreased by 1 deg and the process proceeds to step S17. These steps S13 to S
By the operation of 16, the control differential B is 5d.
It is appropriately modified within the range of 7 to 7 deg.

Next, in step S17, the timer T1 is subtracted, and it is determined in step S18 whether or not 30 minutes, which is the lower limit time, has elapsed since the ON signal was output, and if 30 minutes has not elapsed. In step S19, a flag F1 (hereinafter simply referred to as flag F1) indicating that the control differential B (that is, a predetermined temperature range) needs to be increased is set, and in step S20, it is indicated that the control differential B needs to be decreased. The flag F2 (hereinafter simply referred to as the flag F2) is reset, and step S2
Go to 6. If 30 minutes have not elapsed in step S18, it is determined in step S19 whether the upper limit time of 50 minutes has elapsed since the ON signal was output. If 50 minutes have not elapsed, the flag F1 is set in step S22. The flag F2 is reset, the flag F2 is reset in step S23, and the process proceeds to step S26. If 50 minutes have passed in step S21, the flag F1 is reset in step S24,
The flag F2 is set in step S25, and then step S
Move to 26.

As described above, since the flags F1 and F2 indicating that the control differential B needs to be increased or decreased are set based on the output of the cycle time measuring unit 56, the measurement result of the on / off cycle time is prioritized. Has been processed.

In step S26, it is judged whether or not the compressor is in operation (that is, whether or not an ON signal is output), and it is turned ON.
If the signal is output, the timer T2 is set to 2 in step S27.
Is performed, and it is determined in step S28 whether 50 minutes or more have elapsed since the ON signal was output. If 50 minutes or more have not elapsed, the process proceeds to step S2, and if 50 minutes or more has elapsed, step S29 is performed. Then, the flag F3 is reset, and the process proceeds to step S2. Also, at step S26
If the N signal is not output, the timer T is set in step S30.
The operation of subtracting 1 from 2 is performed, and T2 becomes 0 in step S31.
It is determined whether or not the following, and when T2 exceeds 0, step S
29, and if T2 is 0 or less, it is determined in step S32 that the operating rate is 33% or less, and a flag F indicating that the control differential B needs to be increased.
3 is set and the process proceeds to step S2.

In step S28, it is judged whether the control differential B is not increased if the ON / OFF cycle is longer than the upper limit time even if the operating rate of the compressor is 33% or less. This is because the measurement result of the on / off cycle time is prioritized over the calculation result of the operating rate, and the flag F1 is not set in steps S10 to S12 described above. Start with checking for the presence of
The idea of this priority processing can be easily understood from the fact that the presence / absence of No. 3 is confirmed.

As described above, since the temperature differential control section 55 changes the control differential (that is, the predetermined temperature range) of the temperature control of the freezing room based on the fluctuations in the operation cycle time and the operation rate, the cycle time is changed. Measuring part 5
The control differential can be appropriately set based on the compressor operation cycle time T1 measured in 6 and the operation rate measured in the operation rate measurement unit 57 (U is substituted for T2), and the temperature of the freezer compartment can be set. The control can be performed more finely than before, and the temperature influence on the refrigerating room and the ice greenhouse can be reduced, and a control device suitable for fine temperature control of the entire refrigerator can be provided.

[0033]

According to the present invention, based on the operating cycle time of the compressor measured by the cycle time measuring section and the operating rate measured by the operating rate measuring section, the temperature width control section controls the temperature control of the freezer compartment. Since the differential (that is, the predetermined temperature range) is changed, the control differential can be set appropriately based on the fluctuations in the operation cycle time and the operation rate, and the temperature control of the freezer can be performed more finely than before. As a result, it is possible to reduce the temperature effect on the refrigerating room and the ice greenhouse, and it is possible to provide a control device suitable for extremely fine temperature control of the entire refrigerator.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing a freezer compartment temperature control device of the present invention.

FIG. 2 is an external perspective view of the refrigerator with the door open.

FIG. 3 is a perspective view showing a state in which a door of the refrigerator is removed.

FIG. 4 is a flowchart showing a control operation of a freezer compartment temperature control device.

FIG. 5 is a flowchart showing a control operation of the freezer compartment temperature control device.

[Explanation of symbols]

 1 Refrigerator 12 Freezer compartment 45 Freezer compartment temperature sensor (main temperature sensor) 51 Freezer compartment temperature controller 52 Temperature setting means 53 Control temperature setting part 54 Control means 55 Temperature range setting part 56 Cycle time measuring part 57 Operating rate measuring part 58 Compression Machine

Claims (1)

[Claims] 1. A control temperature for determining an operation start temperature for operating a compressor in a predetermined temperature range and an operation stop temperature for stopping the compressor based on a set temperature set by a temperature setting means for setting the temperature of a freezer compartment. Control for controlling the operation of the compressor based on the setting section and the freezing room temperature detected by the temperature detecting means for detecting the operation start temperature and the operation stop temperature and the freezing room temperature set by the control temperature setting section In the refrigerator equipped with the means, the control means measures the time from the start of operation of the compressor to the start of the next operation, and the cycle time measuring part, and measures the operation time and stop time of the compressor to operate the compressor. A refrigeration characterized by comprising an operation rate measuring unit for calculating a rate, and a temperature width control unit for changing the predetermined temperature width based on the cycle time and the operation rate measured by both of these measurement units. Freezer temperature control device for the refrigerator.