JP3474889B2 - Refrigerator freezer temperature control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator for changing a control temperature range in temperature control of a freezer based on an operation rate and an on / off cycle time of a compressor. The present invention relates to a freezing room temperature control device. 2. Description of the Related Art Prior to the present invention, (i) Japanese Patent Laid-Open No. 2-11 / 1990
The control device for a cooling device disclosed in Japanese Patent No. 5675 controls the operation of the compressor in a predetermined temperature range based on the detected temperature of the space. Further, the control device is configured to control the predetermined temperature range when the operating ratio 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 ratio. Is configured to enlarge. Further, prior to the present invention, (ii)
Japanese Patent Application Laid-Open No. 6-130573 discloses a control device in which a sensor for detecting an outside air temperature is provided, and when the outside air temperature is low, a predetermined temperature range is expanded so that a stop period of the compressor is lengthened. [0004] In the above publication (i), in adjusting the predetermined temperature range, the operating rate of the compressor is measured and the measured operating rate is higher than the predetermined operating rate. When the temperature becomes smaller, the predetermined temperature range is expanded. Therefore, the control differential is expanded by this expansion operation (although the operation ratio of the compressor after the change in the temperature range is likely to be larger than the predetermined operation ratio). If the operation rate becomes larger than the predetermined operation rate by confirming the operation rate, the control differential is reduced. For this reason, in the control operation of expanding the predetermined temperature range when the operation ratio is smaller than the predetermined operation ratio, the temperature range may increase or decrease every on / off cycle of the compressor. The temperature of the freezer compartment is hardly stabilized by the increase / decrease operation, and the temperature influence on other storage compartments cannot be ignored. On the other hand, in the control device disclosed in the above-mentioned publication (ii), not only the outside air temperature sensor is increased but also when a large heat load (for example, warm food etc.) is stored in the refrigerator when the outside air temperature is low. Despite the need for cooling, the outside temperature is low, so the control temperature range is large and it is easy to delay returning to the cooling operation, so the surrounding temperature rises and is stored in the surrounding food and other storage rooms There were inconveniences such as deterioration of food quality. Accordingly, the present invention provides a refrigerator freezing room temperature control device in which a temperature differential in control means for controlling operation of a compressor is automatically controlled based on both an operation rate of the compressor and an on / off cycle time. The purpose is to provide. [0007] The present invention relates to a freezer compartment 12.
Set temperature set by temperature setting means 52 for setting temperature
Operating the compressor 58 at a predetermined temperature width B based on the
Rotation start temperature A and operation stop for stopping the compressor 58
A control temperature setting section 53 for determining the temperature C;
Operation start temperature A and operation stop temperature set by the constant unit 53
C and a temperature detecting means 45 for detecting the temperature of the freezing compartment 12
Of the compressor 58 based on the freezing room temperature F detected at
Temperature of a refrigerator having a control means 54 for controlling the temperature of the refrigerator.
In the control device, this control means 54
During a cycle that measures the time from the start of one operation to the start of the next operation
The operation time and stop time of the interval measuring unit 56 and the compressor 58
The operation rate measurement unit 5 that calculates the operation rate of the compressor 58
7 and the operation rate measured by the operation rate measurement unit 57
The predetermined temperature range B is changed so as to approach the conversion rate,
Cycle time measured by cycle time measurement unit 56
If the time is longer than the predetermined temperature regardless of the operation rate,
It is intended to provide a freezer compartment temperature control device of a refrigerator including a temperature width control unit 55 for decreasing the degree width B. [0008] Since the predetermined temperature range (determined by the operation start temperature-operation stop temperature) is changed by the temperature range control unit, the operation cycle time and the operation rate of the compressor measured by the measurement unit are changed. The temperature differential in the freezer compartment temperature control can be appropriately set based on this, so that the temperature control of the freezer compartment can be performed very finely and the temperature influence on the refrigerator compartment can be reduced. Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a household refrigerator, which comprises a heat-insulating box 2 having a front opening constituting a main body thereof, and doors 3, 4, 5, 6, 7, and 8 closing the opening. Reference numeral 11 denotes a horizontal partition wall for partitioning the inside of the heat insulating box 2 up and down. In this embodiment, a freezing compartment 12 is cooled above the horizontal partition wall 11 to a freezing temperature, and a lower portion is set to a temperature at which food does not freeze. It is a storage room to be cooled. The storage room is further vertically divided by a pre-partitioning member 13 and a partition plate 14, and 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 selection chamber 16 can set the temperature. The doors 3 and 4 are rotatable doors corresponding to the freezer compartment 12, and the door 4 is provided with a partition 17 for partitioning the opening of the freezer compartment left and right. The doors 5 and 6 are rotatable doors corresponding to the refrigerator compartment 15, and the door 6 is provided with a partition 18 that partitions the opening of the refrigerator compartment to the left and right. The doors 7 and 8 are drawer-type doors corresponding to a bottle room and a vegetable room which are partitioned left and right by a vertical partition wall 30 in the selection room 16, and both doors mainly store bottles and vegetables, respectively. Top opening container 2
1 and 22 are provided detachably. At the back of the freezer compartment 12, there is a cooler compartment formed by a cooler cover 31 and a heat insulating box 2. The cooler compartment has a plate-fin 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 outlets 32, 33, and 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 three upper, middle, and lower stages by two shelves 35, 36, and the lower stage is divided into right and left by a vertical partition plate 37. An automatic ice maker 38 is arranged at the rear of the middle left side, and this rear space is referred to as an ice maker 39. The ice making room is covered with an ice making machine cover 40 and is separated 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 maker is arranged so as to 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 disposed so as to be able to freely enter and exit with an interval 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, which is cooled by the cool air blown out from the outlet 34. The bottom plate of this container is made of a metal plate having good thermal conductivity such as aluminum. The cool air blown out to the freezing room 12 returns to the lower part of the cooler room via a cool air return path 42 formed by the bottom plate of the container and the horizontal partition wall 11. In addition, for convenience of the following description, a freezing room other than the quick freezing room 44 is referred to as a first freezing room 43. In the first freezer compartment 43, two temperature sensors for detecting the temperature are provided, and one of the two temperature sensors is provided as a freezer compartment temperature sensor provided near the outlet 33. A temperature sensor 45 (hereinafter, referred to as an F sensor), and the other of the two is a slave temperature sensor 46 provided near the ice tray of the ice making chamber 39. In addition, the quick freezing room 44
Is provided with a quenching chamber temperature sensor 47 near the outlet 34, and a load temperature sensor 48 that contacts the lower surface of the bottom plate of the container. Immediately below the horizontal partition 11, the temperature just before the food is frozen, that is, the ice temperature (for example, −1)
An ice greenhouse 49 maintained at a temperature of about (° C.) is formed. The cooler chamber also communicates with the ice temperature chamber 49 via a duct through an opening formed in a duct (not shown). The supply of cold air to the ice temperature chamber 49 is controlled by a cold air control device (hereinafter simply referred to as an H damper) for the ice temperature chamber including an ice temperature damper provided in the middle of the duct. In addition, refrigerator room 1
The supply of cold air to the refrigerator 5 is performed by a cold room control device (not shown) including a cold damper provided in the middle of a duct (not shown).
Is controlled by The structure of an H damper (not shown) will be described. A baffle that opens and closes an opening formed in a duct, a motor as a drive source of the baffle, and rotation of this motor is one cycle of closing, opening, and closing the baffle. Power conversion means for converting the signal into an open / close operation, and position detection means for outputting a signal (hereinafter, this signal is referred to as a position detection signal) at a portion corresponding to the fully closed position of the baffle in one cycle operation of the power conversion means. This H damper is,
The operation is controlled based on a control signal from the ice greenhouse temperature control device. Next, the freezing room temperature controller 51 will be described with reference to the block circuit diagram of FIG. Freezer compartment temperature controller 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 a setting set by the temperature setting means 52. A control temperature setting unit 53 for automatically setting the operation start temperature A and the 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 control means 54 for controlling the stop of operation. There are several methods for the temperature setting method in the control temperature setting section 53. In this embodiment, for example, when the set temperature is -18.degree. C. and the control differential B is 5.degree. Temperature A is -15.5
° C and the operation stop temperature C are automatically set to -20.5 ° C. The control differential B is appropriately corrected by a temperature width control unit 55 described later. The control means 54 operates based on the temperature F of the freezer compartment detected by the main temperature sensor 45 and the operation start temperature A and the 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.
A cycle time measuring unit 56 for measuring a time until the next ON signal is output based on N (that is, an ON signal) (this is referred to as an ON / OFF cycle time), and an ON signal and an OFF signal from the temperature width control unit 55. An operation rate measuring unit 57 for measuring the operation time and the stop time of the compressor based on the calculated operation rate and calculating the operation rate of the compressor. The cycle time measuring section 56 subtracts 1 from the timer T1 (in this embodiment, the initial value is set to 50 minutes) when the ON signal is input. Further, the driving rate measuring unit 57 adds 2 to the timer T2 (initial value is set to 0) when the ON signal is input, and subtracts 1 from the timer T2 when the 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 = 100 m / (M +
n). T2 = 0 is obtained when m = 1/3 and n
= 2/3, and the operation rate U0 (this is the predetermined operation rate U0) at this time is about 33%. Therefore,
Due to the magnitude relationship between T2 and 0, when T2 ≦ 0, the operation rate U is 33% or less, and when T2> 0, the operation rate U is 3%.
It is estimated that it exceeds 3%. On the other hand, based on the output T1 from the cycle time measuring section 56 and the output T2 from the operation rate measuring section 57, the temperature width control section 55 controls the control differential B (ie, the predetermined temperature) in the control temperature setting section 53. It also has a function to increase or decrease the width. That is, the output T1 from the cycle time measuring unit 56 is set to a lower limit time (30 minutes in this example) for reducing the control differential B or an upper limit time (5 minutes in this example) for increasing the control differential B.
0 min), while the output T from the operation rate measurement unit 57
2 is compared with a value 0 indicating a predetermined operation rate U0 (33%), and the control differential B is increased or decreased based on the result of both comparisons. In the present embodiment, in order to give priority to the output of the cycle time measurement unit 56 over the output of the operation rate measurement unit 57, confirmation is performed as described in the operation flow (particularly, step S28) described later. The operation flow of the freezer compartment temperature control device 51 based on the above configuration will be described with reference to the flowcharts 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, since the initial value of B is 5 deg, the set temperature +
It is determined whether the temperature is equal to or higher than 2.5 ° C., and if it is equal to or more than A, the process proceeds to step S5. 5de
g) to determine whether the temperature is higher than the set temperature -2.5 ° C).
If so, the process proceeds to step S5. If less than C, an OFF signal is output from the temperature width control unit 55 to stop the compressor and the F fan in step S4, and the process proceeds to step S5.
Move to 17. In step S5, it is determined whether or not the operation start signal (ON signal) of the compressor has been output. If the signal has been output, the process proceeds to step S17, and if not, the ON signal has been output in step S6. In step S7, the timer T1 is set to an initial value (the upper limit time is 50 minutes), (operation start temperature A-control differential B) is input as the operation stop temperature C in step S8, and the timer T2 is set in step S9. Reset. In the next step S10, it is determined whether or not the flag F1 has been set, and if F1 has been set, the flow proceeds to step S13 . In step S10,
Unless lugs F1 is set proceeds to step S1 1. In step S11, it is determined whether or not the flag F2 has been set. If F2 has been set, the process proceeds to step S15, and if F2 has not been set, the process proceeds to step S12 . In step S12, it is determined whether or not the flag F3 is set. If F3 is not set, the process proceeds to step S17, and if F3 is set, the process proceeds to step S13. In step S13, it is determined whether or not the control differential B is equal to 7, and if it is equal to 7, the process proceeds to step S17. If not, the process proceeds to step S1.
At 4, the control differential B is increased by 1 deg, and the routine goes to Step S17. In step S15, it is determined whether or not 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 reduced by 1 deg and the process proceeds to step S17. These steps S13 to S
By the operation of No. 16, the control differential B becomes 5d
It is appropriately corrected in the range of eg to 7 deg. Next, in step S17, a subtraction operation of the timer T1 is performed. In step S18, it is determined whether or not 30 minutes, which is the lower limit time, has elapsed since the ON signal was output. In step S19, a flag F1 (hereinafter simply referred to as a 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
Move to 6. If 30 minutes have not elapsed in step S18, it is determined whether or not 50 minutes as the upper limit time has elapsed since the ON signal was output in step S19. If 50 minutes have not elapsed, the flag F1 is reset in step S22. The flag F2 is reset in step S23, and the process proceeds to step S26. If 50 minutes have elapsed in step S21, the flag F1 is reset in step S24,
In step S25, the flag F2 is set, and in step S25
Move to 26. 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 section 56, the measurement result of the on / off cycle time has priority. Have been processed. In step S26, it is determined whether or not the compressor is operating (ie, whether or not an ON signal has been output).
If the signal is output, the timer T2 is set to 2 in step S27.
Do adding, is output ON signal determines whether older than 50 minutes in step S28, the process proceeds to step S2 8 If after more than 50 minutes, if older than 50 minutes Step In step S29, the flag F3 is reset, and the process proceeds to step S2. If the ON signal is not output in step S26, an operation of subtracting 1 from the timer T2 is performed in step S30, and it is determined whether or not T2 is 0 or less in step S31. If T2 exceeds 0, the process proceeds to step S29. , T2 is 0 or less, step S32
Then, it is determined that the operation rate has become 33% or less, and a flag F3 indicating that the control differential B needs to be increased is set, and the process proceeds to step S2. In step S28, it is determined whether or not the operation time of the compressor is equal to or longer than the upper limit time. If the ON / OFF cycle is equal to or longer than the upper limit time even if the operation rate of the compressor is lower than 33%, the control differential B is not increased. The reason is that the measurement result of the on / off cycle time is processed prior to the calculation result of the operation rate, and the flag F1 is set in steps S10 to S12 described above. Starts with confirmation of the presence or absence of
It is easy to understand the concept of this priority processing from the fact that the presence or absence of the third processing is confirmed. As described above, the temperature differential of the temperature control of the freezer compartment (that is, the predetermined temperature range) is changed by the temperature range controller 55 based on the fluctuations of the operation cycle time and the operation rate. Measuring unit 5
The control differential can be appropriately set based on the operation cycle time T1 of the compressor measured in Step 6 and the operation rate (U is substituted by T2) measured by the operation rate measurement unit 57, and the temperature of the freezer compartment can be set. The control can be performed more finely than before, and the influence of temperature on the refrigerator compartment and the ice greenhouse can be reduced, so that a control device suitable for very fine temperature control of the entire refrigerator can be provided. According to the present invention, the temperature range controller controls the temperature of the freezing room 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. Since the control differential of the control (that is, the predetermined temperature range) is changed, the control differential can be appropriately set based on the fluctuation of the operation cycle time and the operation rate, and the temperature control of the freezing compartment is performed more than before. together will allow very fine, it is possible to reduce the temperature effect on the refrigerating chamber, can provide a control device suitable for very fine temperature control of the entire refrigerator.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block circuit diagram showing a freezing room temperature control device of the present invention. FIG. 2 is an external perspective view of the refrigerator with a door opened. FIG. 3 is a perspective view showing a state where a door of the refrigerator is removed. FIG. 4 is a flowchart illustrating a control operation of the freezing room temperature control device. FIG. 5 is a flowchart illustrating a control operation of the freezing room temperature control device. [Description of Signs] 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 section 54 control means 55 temperature width setting section 56 cycle time measurement section 57 operation Ratio measuring unit 58 Compressor and blower (F fan)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-115567 (JP, A) JP-A-56-144377 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25D 11/02 G05D 23/19

Claims (1)

(57) Patent Claims 1. A driving start temperature to operate the compressor at a predetermined temperature range based on the set temperature set by the temperature setting means for setting the temperature of the freezing compartment and the compressor and a control temperature setting unit for determining a shutdown temperature to stop the detected freezer compartment temperature detecting means for detecting the temperature of the control temperature setting unit and the operation start temperature set in and the shutdown temperature and the freezing chamber the Contact <br/> in are in the refrigerator freezer compartment temperature control device and a control means for controlling the operation of the compressor based on the temperature, the control means, following the start of operation start of the operation of the previous SL compressor and cycle time measuring unit for measuring the time until, the previous SL measure the operating time and stop time of the compressor and the operation ratio measuring unit for calculating the operating rate of the compressor, the measured operation ratio by the operation ratio measuring unit To a prescribed operation rate
The predetermined temperature range is changed so as to approach the
Cycle time measured by the
In the case of a long time, the predetermined temperature range is reduced regardless of the operation rate.
Refrigerator freezing compartment temperature control device being characterized in that a temperature width control unit causes lack.