JP2014031947A - Refrigerator-freezer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator-freezer which stably controls a temperature increase in a stored item when a heat load is generated while curbing an increase in a cost and reducing electricity consumption.SOLUTION: If one operation cycle starts when a compressor is started up and ends when the same is stopped, a control section increases a speed of the compressor in stages from a first start-up speed in the operation cycle. When the speed of the compressor reaches a predetermined speed, the control section sets the start-up speed of the compressor at a second start-up speed which is faster than the first start-up speed for the operation cycle subsequent to the operation cycle when the speed reaches the predetermined speed.

Description

  The present invention relates to a refrigerator-freezer.

  The power consumption of the refrigerator is reduced by improving the performance of the box heat insulating material and introducing inverter control and feedback control related to the compressor speed. For example, in a box heat insulating material, the heat insulating performance can be dramatically improved by embedding a vacuum heat insulating panel in the box and foaming with urethane, and the amount of heat leaking from the box can be reduced. As a result, it is possible to reduce the cooling capacity necessary for maintaining the temperature of stored goods (food, etc.), and the speed reduction and optimization of the compressor directly connected to the cooling capacity are achieved.

  The optimization of the compressor speed referred to here means that the compressor speed is changed in multiple stages in accordance with various heat loads applied to the refrigerator, thereby reducing the power consumption of the compressor. In addition, as a thermal load, the thermal influence of the external air penetration | invasion accompanying the door opening / closing when preserve | saving stored goods in a store | warehouse | chamber, the temperature of the stored stored goods, the thermal influence by the temperature around a refrigerator, etc. are mentioned, for example.

  The same applies to the internal fan (blower fan), and fine control can be performed according to the load by setting the speed in multiple stages. In other words, when the load is low, the compressor or internal fan is operated at the necessary minimum speed, and at the high load, the necessary minimum speed (to be relatively higher than that at the low load) to suppress the temperature rise of the stored items. By operating the compressor or the internal fan, useless electrical energy can be saved and power consumption can be reduced.

  As multistage control of the compressor speed, the starting speed of the compressor is determined based on the outside air temperature detected by the outside air temperature sensor, and if a predetermined time elapses during the operation of the compressor, the speed is gradually increased to one rank. There has been proposed a control for shifting the speed (see, for example, Patent Document 1).

  In addition, the compressor start speed when restarting from the compressor speed immediately before the compressor is stopped is calculated and specified by PID calculation, etc., so that even when the load increases in the previous operation, the compressor speed is A control method has been proposed in which the temperature of stored items is not raised by performing adjustment (see, for example, Patent Document 2).

  Furthermore, a control method has been proposed in which the compressor speed at the time of restart is changed when the difference between the detected temperature and the detected temperature is large while the compressor is stopped (see, for example, Patent Document 3).

Japanese Patent No. 4032819 (see, for example, FIG. 16) Japanese Patent No. 4141762 (see, for example, claim 1 and paragraphs [0032] to [0034]) JP-A-1-49851 (for example, refer to the claims)

The technique described in Patent Document 1 is a stepwise shift to a speed that is one rank higher if a predetermined time elapses during operation of the compressor. If the door is opened frequently during storage of the compressor or if stored items with high temperature are stored, the compressor will run longer and the compressor will stop after reaching a relatively high rank. There is a case.
In the technique described in Patent Document 1, the next compressor starting speed is increased from the original starting speed again, so that the cooling capacity is reduced. That is, in the technique described in Patent Document 1, the cooling capacity is reduced, and it takes time to lower the temperature of the stored product stored in the warehouse, or the temperature does not decrease, and the temperature rise of the stored product is stably suppressed. There was a problem that it was difficult to do.

Here, the compressor stops even if the temperature of the stored item in the warehouse does not fall down, that is, the cooling is stopped. The temperature of the temperature sensor installed in the freezer compartment is reduced. This is because. This is due to the fact that the temperature sensor itself tends to cool because the heat capacity of the stored item is generally smaller than that of the temperature sensor.
Of course, there are also cooling stops for the amount that the compressor has stopped, so in such cases, it is desirable to suppress the rise in the temperature of stored goods by increasing the cooling capacity immediately after restarting. .

In the technique described in Patent Document 2, there is a problem that a control specification program becomes complicated because of PID calculation and the development cost is increased.
In the technique described in Patent Document 2, since the load determination is performed immediately before the compressor is stopped, the load state is not immediately known until the compressor is stopped, and the load in the operating state before the compressor is stopped. There was a problem that the corresponding processing could not be performed.

  In the technique described in Patent Document 3, the compressor speed at the time of restart can be determined based on the temperature when the compressor is stopped, but the load state may be high even when the compressor is not stopped. That is, the technique described in Patent Document 3 has a problem that, as in Patent Document 2, load handling processing cannot be performed in the operating state before the compressor stops.

  The present invention has been made to solve at least one of the above-described problems. The temperature rise of stored items when a thermal load is generated while suppressing cost increase and reducing power consumption. It aims at providing the refrigerator-freezer which suppresses stably.

  A refrigerator-freezer according to the present invention is a refrigerator-freezer having a freezer compartment for freezing stored items, an inverter-controlled compressor capable of shifting in multiple steps, a freezer compartment temperature sensor for detecting the temperature of the freezer compartment, and a freezer compartment A controller that stops the compressor when the detection result of the temperature sensor is less than or equal to the set lower limit, and that drives the compressor when the detected value is greater than or equal to the set upper limit, and the controller stops after driving the compressor Is a step in which the compressor speed is increased stepwise from the first startup speed in the operation cycle, and the compressor speed reaches a predetermined speed. The starting speed of the compressor in the operating cycle next to the operating cycle that has reached the predetermined speed is set to a second starting speed that is faster than the first starting speed.

  In the refrigerator-freezer according to the present invention, when the speed of the compressor reaches a predetermined speed, the start speed of the compressor in the operation cycle next to the operation cycle that has reached the predetermined speed is set to the first start speed. Therefore, the temperature rise of the stored item when a thermal load is generated can be stably suppressed while realizing cost increase suppression and low power consumption.

It is a front view of the refrigerator-freezer which concerns on Embodiment 1 of this invention. It is AA sectional drawing of the refrigerator-freezer shown in FIG. It is a perspective view of the temperature operation panel of the refrigerator-freezer which concerns on Embodiment 1 of this invention. It is a flowchart of the determination method of the compressor starting speed which concerns on Embodiment 1 of this invention. It is a time change of the compressor speed, the detection temperature Tf of the freezer temperature sensor, and the temperature of the stored product stored in the freezer when a small load occurs. It is the time change of the compressor speed, the detected temperature Tf of the freezer temperature sensor, and the temperature of the stored product stored in the freezer when a large load occurs. Time change of the compressor speed, the detected temperature Tf of the freezer temperature sensor, and the temperature of the stored product stored in the freezer when a large load occurs without performing the speed control according to the first embodiment of the present invention It is. It is a modification of the determination method of the compressor starting speed of FIG. It is a flowchart of the determination method of the ventilation fan starting speed which concerns on Embodiment 2 of this invention. It is a time change of the temperature of the ventilation fan speed when the small load arises, the detection temperature Tf of the freezer temperature sensor, and the stored product preserve | saved in a freezer. It is a time change of the ventilation fan speed, the detection temperature Tf of the freezer compartment temperature sensor, and the temperature of the stored product stored in the freezer compartment when a large load occurs. Temporal change in the blower fan speed, the detected temperature Tf of the freezer temperature sensor, and the temperature of the stored product stored in the freezer when a large load occurs without performing the speed control according to the second embodiment of the present invention It is. It is a modification of the determination method of the compressor starting speed of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 is a front view of a refrigerator-freezer 100 according to Embodiment 1. FIG. 2 is a cross-sectional view taken along the dotted line AA of the refrigerator-freezer 100 shown in FIG. FIG. 3 is a perspective view of temperature operation panel 8 of refrigerator-freezer 100 according to the first embodiment. With reference to FIGS. 1-3, the schematic structure of the refrigerator-freezer 100 is demonstrated.
The refrigerator-freezer 100 according to the present embodiment is improved by adopting a control method that suppresses the temperature rise of stored items when a thermal load is generated while realizing energy saving.

[Description of configuration]
The refrigerator-freezer 100 has a refrigerator compartment 1, an ice making compartment 2, a switching compartment 3, a freezer compartment 4, and a vegetable compartment 5 from the upper part of the main body. Each room is partitioned by a heat insulating partition wall 6. Further, a temperature operation panel 8 (see FIG. 3) capable of adjusting the temperature in each room is installed on the surface of the refrigerator door 7, and an outside air temperature sensor 10 for detecting the outside air temperature is provided on the substrate 9 therein. It is installed.

The refrigerator-freezer 100 selects a room whose temperature is to be adjusted by pressing the button 54 of the temperature operation panel 8 installed in the refrigerator compartment door 7, and presses the button 55 to change the temperature to low, medium, strong, etc. The room temperature can be adjusted.
In the temperature adjustment of the refrigerator compartment 1, the button 55 installed on the temperature operation panel 8 can be pressed to select, for example, weak (about 6 ° C.), medium (about 3 ° C.), or strong (about 1 ° C.). Similarly, the freezer compartment 4 can be selected, for example, weak (about −16 ° C.), medium (about −18 ° C.), or strong (about −20 ° C.) by pressing the button 55. The refrigerator compartment 1 and the freezer compartment 4 are not limited to being capable of three-stage temperature adjustment in this way, and may be, for example, four stages or more, but in the first embodiment, there are three stages. It will be explained as a thing.
The switching chamber 3 is pressed by pressing the button 55, for example, the temperature of the switching chamber 3 is weakened by about -7 ° C suitable for frozen storage for about two weeks, or about -18 ° C suitable for frozen storage for about one month. It is possible to select two stages of normal freezing.

  The refrigerator / freezer 100 has an outer box composed of an inner box and an outer box, and a heat insulating material 28 (urethane foam material) is filled between the inner box and the outer box. Furthermore, the vacuum heat insulation panel 13 for suppressing a heat leak is installed in the both sides of a refrigerator-freezer (illustration omitted), a back surface, a ceiling surface, the heat insulation part inside a door, etc. The vacuum heat insulation panel 13 is arrange | positioned inside the heat insulating material 28 so that the room in a store | warehouse | chamber may be enclosed.

A control unit 12 having a board provided with a microcomputer or the like for controlling electrical components used in the refrigerator-freezer 100 is housed in the upper rear portion of the refrigerator compartment 1. The control unit 12 performs arithmetic processing on a “signal” detected by a temperature sensor installed in each room, converts it to “temperature”, and performs various controls based on the temperature. In the following description, the “signal” detected by the temperature sensor will be described as the “temperature” that has been processed.
The control unit 12 performs processing such as operation and stop of the compressor 25 from the temperature Tf detected by the freezer temperature sensor 53 or switches from the temperature detected by the switching chamber temperature sensor 52 installed in the switching chamber 3. The baffle (not shown) of the room damper device 27 is opened or closed.

  The upper freezer compartment at the lower part of the refrigerator compartment 1 has separate left and right rooms. That is, the refrigerator compartment 1 is provided with an ice making chamber 2 provided with an automatic ice making machine (not shown) on the left side of the main body, and a switching chamber 3 on the right side. In the ice making chamber 2 on the left side, a drawer type door is provided so as to be movable back and forth, and an ice making chamber case 14 is provided in the ice making chamber 2. Further, a pull-out type door is provided in the right switching chamber 3 so as to be movable back and forth, and a switching chamber case 15 is provided in the switching chamber 3. A cooler 18 is provided between the fan grill 16 and the inner box 17. A defrost heater 19 and a drain pipe 20 are provided below the cooler 18, and the defrost water is a drain pipe 20 embedded in the inner box 17. By this, it is discharged to the evaporating dish 21 installed on the compressor 25 below the refrigerator-freezer.

The freezer compartment 4 includes, for example, a lower large storage case 22 that is intended for long-term storage for about one month, and a shallow upper shallow case 23 that is installed on a flange (not shown) formed in the lower large storage case 22. And are provided.
A fan grill 16 for adjusting the temperature of the ice making chamber 2, the switching chamber 3, and the freezing chamber 4 is provided on the back side of the freezing chamber 4. The fan grill 16 includes a blower fan 24, a refrigerator compartment damper device 26, and a switching chamber damper device 27, and is provided from the top of the ice making chamber 2 and the switching chamber 3 to the bottom of the freezer compartment 4.
The control unit 12 opens and closes the baffles of the refrigerating room damper device 26 and the switching room damper device 27 based on the detection results of the temperature sensors installed in the ice making room 2, the switching room 3, and the freezing room 4. As a result, the temperature of the ice making chamber 2, the switching chamber 3, and the freezing chamber 4 can be adjusted.
In addition, the freezer compartment temperature sensor 53 that detects the temperature at which the operation / stop of the compressor 25 is determined is installed on the surface of the fan grill 16 at the back of the freezer compartment 4.

The vegetable room 5 is slightly higher in temperature than the refrigerating room 1, but is basically a room in a refrigerating temperature zone and is provided at the lowermost side of the refrigerator / freezer 100. The vegetable compartment 5 is placed on a lower storage case 29 for storing large vegetables and a flange (not shown) formed in the lower storage case 29, and is shallower than the lower storage case 29. An upper storage case 30 that is convenient for storing leafy vegetables and small vegetables is provided.
For cooling the vegetable compartment 5, a refrigerated compartment return air passage 31 installed at the upper part of the main body is used.
The refrigeration room return air passage 31 passes through the back right back of the switching room 3 and the back right back of the freezing room 4, comes out to the right back of the vegetable room 5, connects to the ceiling of the vegetable room 5, and the center of the vegetable room 5. It is connected to the cooler room sometimes. Since the cold air flowing through the refrigeration chamber return air passage 31 is in the refrigeration temperature zone, a heat insulation structure is not required between the refrigeration chamber return air passage 31 and the vegetable compartment 5, but the refrigeration chamber return air passage 31 and the cooler. In order to prevent air passage blockage due to frost formation, a heat insulating structure is required between the two and 18 (not shown).

  The refrigerator compartment 1 is divided by a plurality of resin or glass shelves 43 to 45. In the first embodiment, an example in which three shelves are provided is illustrated. An accessory storage case 46 is installed under the lowermost shelf 45 and has a temperature lower by 1 to 2 (° C.) than the upper shelf. This is because the return port of the cold room cold air is installed under the accessory storage case 46, and the low temperature cold air has a lower buoyancy than the room temperature air, so it tends to stay below, and the lower part of the cold room 1 is slightly lower in temperature. Because it becomes.

  A plurality of pockets 57 are attached to the refrigerator compartment door 7. The refrigerating room door 7 is divided into one that is divided at the center of the refrigerating refrigerator where the revolving space when the refrigerating room door 7 is opened is small or that is not divided because the refrigerating refrigerator width is relatively small (less than about 60 cm). There is something to be done. In this Embodiment 1, the case where the refrigerator compartment door 7 is divided | segmented in the center of the freezer refrigerator in FIG. 1 is shown as an example.

  On the back side of the refrigerator compartment 1, a control panel 47 is provided that distributes the cold air supplied from the lower part of the refrigerator compartment 1 to the space partitioned by the shelves 43 to 45 of the refrigerator compartment 1. The control panel 47 includes a resin part 48 provided on the design surface side (the refrigerator compartment 1 side) and a foam duct part 49 provided on the heel side of the resin part 48. The foam duct part 49 is provided with an air passage hole 56 for taking in the cold air in the first duct portion 50 supplied through the cold room damper device 26 into the cold room 1.

  A refrigerator temperature sensor 51 that detects the temperature of the refrigerator compartment 1 is provided in the middle of the height of the refrigerator compartment 1. More specifically, the refrigerating room temperature sensor 51 is provided at a position between the shelf 45 and the shelf 44 in the resin component 48 so that the average temperature of the refrigerating room 1 can be detected. .

A compressor 25 corresponding to inverter control is mounted on the lower back of the refrigerator-freezer 100.
As shown in Tables 1 to 4 to be described later, the speed of the compressor 25 is determined based on the temperature settings of the refrigerator compartment 1 and the freezer compartment 4 and the outside air temperature AT. The compressor 25 is electrically connected to the control unit 12 and operates based on a control signal from the control unit 12.

In the first embodiment, the arrangement of the rooms, the arrangement position of the compressor 25, and the like are not limited to the modes shown in FIGS. 1 and 2, and the ice making chamber 2 and the switching chamber 3 are not provided. The arrangement position of the machine 25 may be different from the drawing.
Furthermore, although the temperature operation panel 8 demonstrated the case where it was installed in the outer side of the refrigerator-freezer 100 as an example, it is not limited to it. For example, you may install in the refrigerator compartment 1 in consideration of design nature. In this case, the outside air temperature sensor 10 can be installed in the upper hinge device portion 11 of the refrigerator compartment door 7.

[About operation of compressor 25]
Next, the operation of the compressor 25 will be described based on the following Tables 1 to 4. Here, Table 1 shows compressor speed ranks, and Table 2 shows rank settings of refrigerator compartment / freezer compartment temperatures. Table 3 shows the starting speed setting of the compressor 25 for each temperature detected by the outside air temperature sensor 10 based on the temperature rank, and Table 4 shows the shift time of the compressor 25 based on the temperature rank.
Regarding the numerical values in each table, in the first embodiment, the refrigerator volume of the refrigerator 100 is 520 L, the cylinder volume of the compressor (stroke volume is equivalent to the displacement of an automobile engine) is 10 (cc), vacuum The numerical value is also changed by changing the number of installed thermal insulation panels 13 and the installation position.

  As shown in Table 1, the control unit 12 can set 10 levels of C1 (20 Hz) to C10 (80 Hz) as the use speed rank of the compressor 25. Here, the speed rank of the C1 speed to the C6 speed is defined as a low load rank that is a low load side, and the speed rank of the C7 speed or higher is defined as a high load rank that is a high load side.

  As described above, the refrigerator / freezer 100 allows the user to select the temperature setting of the refrigerator compartment 1 and the freezer compartment 4 using the temperature operation panel 8. As shown in Table 2, combinations of temperature settings of the refrigerator compartment 1 and the freezer compartment 4 are defined as temperature ranks, and are classified into H setting, M setting, and L setting. Compared with the M setting, the H setting is a setting where the temperature is high and the L setting is a setting where the temperature is low. That is, as for the temperature rank, the M setting is smaller than the H setting, and the L setting is smaller than the M setting. When the cooling of the refrigerator compartment 1 and the freezer compartment 4 is selected as “weak”, for example, it is set to H from Table 2.

The refrigerator-freezer 100 determines the starting speed of the compressor 25 (hereinafter also referred to as the compressor starting speed) at the H setting, the M setting, and the L setting based on the detection result of the outside temperature sensor 10 that detects the outside temperature AT. decide.
Table 3 shows an example in which 20 (° C.) is adopted as the threshold value of the outside air temperature AT. For example, when the outside air temperature AT is 20 (° C.) or higher, the compressor starting speed when H is set is C3, the compressor starting speed when M is set is C4, and the compressor when L is set The starting speed is C5. When the outside air temperature AT is less than 20 (° C.), the compressor starting speed is set to be small as the heat transferred to each room is reduced.

The higher the outside air temperature AT is, and the lower the temperature rank is, the larger the temperature difference between the inside and the outside air becomes, and the amount of heat leakage of the refrigerator / freezer 100 increases. For this reason, a larger cooling capacity is required.
Since the cooling capacity depends on the air flow rate of the cooler and the temperature difference between the cooler and the object to be cooled, the compressor speed is increased for the purpose of lowering the cooler temperature (increasing the temperature difference from the object to be cooled). The cooling capacity is increased by lowering the cooler temperature.

  Table 4 shows the shift time from the start of the compressor 25 to the shift to a speed one rank higher. The shift time is changed according to the temperature rank (H, M, L) and the load rank (C1 to C10).

[How to determine compressor start-up speed]
FIG. 4 is a flowchart of a method for determining the compressor starting speed in the first embodiment. The compressor starting speed refers to the speed when starting the compressor 25. With reference to FIG. 4, a method for determining the speed when starting up the compressor 25 will be described step by step.

(Step S0)
The control unit 12 performs control for determining the compressor starting speed.
(Step S1)
The control part 12 determines whether the detection result of the freezer temperature sensor 53 is Ton or less.
(Step S2)
The control unit 12 stops the operation of the compressor 25. This is because the detection result of the freezer temperature sensor 53 is Ton or less, and the freezer compartment 4 is cooled.

(Step S3)
The control unit 12 determines whether the temperature setting of the freezer compartment 4 is strong, medium, or weak.
When the temperature setting of the freezer compartment 4 is strong, it transfers to step S6.
If the temperature setting of the freezer compartment 4 is in progress, the process proceeds to step S4.
When the temperature setting of the freezer compartment 4 is weak, it transfers to step S5.
(Step S4)
The control part 12 determines whether the temperature setting of the refrigerator compartment 1 is strong.
When the temperature setting of the refrigerator compartment 1 is strong, it transfers to step S6.
When the temperature setting of the refrigerator compartment 1 is not strong, it transfers to step S7.
(Step S5)
The control unit 12 determines whether the temperature setting of the refrigerator compartment 1 is strong, medium, or weak.
When the temperature setting of the refrigerator compartment 1 is strong, it transfers to step S6.
When the temperature setting of the refrigerator compartment 1 is medium, the process proceeds to step S7.
When the temperature setting of the refrigerator compartment 1 is weak, it transfers to step S8.

(Step S6)
The control unit 12 determines that the temperature rank is set to L, and proceeds to step S10.
(Step S7)
The control unit 12 determines that the temperature rank is M setting, and proceeds to step S20.
(Step S8)
The control unit 12 determines that the temperature rank is set to H, and proceeds to step S30.

(Step S10)
The controller 12 determines whether or not the outside air temperature AT is 20 ° C. or higher.
When it determines with it being 20 degreeC or more, it transfers to step S11.
If it is determined that the temperature is not 20 ° C. or higher, the process proceeds to step S15.
(Step S11, Step S15)
The control unit 12 determines whether or not the operation of the compressor 25 has been operated at a high load rank (C7 speed or higher) in the previous cycle.
The cycle refers to three cycles shown in FIG. 5 described later and five cycles shown in FIG. Therefore, the previous cycle refers to cycle 2 which is the previous cycle in the control of cycle 3 in FIG.
If the predetermined speed C7 is reached in step S11, the process proceeds to step S12. If the predetermined speed C7 is not reached, the process proceeds to step S14.
If the predetermined speed C7 is reached in step S15, the process proceeds to step S16. If the predetermined speed C7 is not reached, the process proceeds to step S18.
(Step S12, Step S16)
The control unit 12 determines whether or not the operation time of the previous cycle is 130 minutes or longer.
In step S12, when the operation time is 130 minutes or more, the process proceeds to step S13. If the operation time is not 130 minutes or more, the process proceeds to step S14.
If the operation time is 130 minutes or longer in step S16, the process proceeds to step S17. If the operation time is not 130 minutes or more, the process proceeds to step S18.

(Step S13)
The control unit 12 sets the compressor start speed to C6 speed.
(Step S14)
The control unit 12 sets the compressor start speed to C5 speed.
(Step S17)
The control unit 12 sets the compressor start speed to C6 speed.
(Step S18)
The control unit 12 sets the compressor start speed to the C3 speed.

(Step S20)
The controller 12 determines whether or not the outside air temperature AT is 20 ° C. or higher.
When it determines with it being 20 degreeC or more, it transfers to step S21.
When it determines with it not being 20 degreeC or more, it transfers to step S25.
(Step S21, Step S25)
The control unit 12 determines whether or not the operation of the compressor 25 has performed a high load rank operation in the previous cycle.
In step S21, when the predetermined speed C7 is reached, the process proceeds to step S22. If the predetermined speed C7 is not reached, the process proceeds to step S24.
If the predetermined speed C7 is reached in step S25, the process proceeds to step S26. If the predetermined speed C7 has not been reached, the process proceeds to step S28.
(Step S22, Step S26)
The control unit 12 determines whether or not the operation time of the previous cycle is 130 minutes or longer.
In step S22, when the operation time is 130 minutes or more, the process proceeds to step S23. If the operation time is not 130 minutes or more, the process proceeds to step S24.
In step S26, when the operation time is 130 minutes or more, the process proceeds to step S27. If the operation time is not 130 minutes or more, the process proceeds to step S28.

(Step S23)
The control unit 12 sets the compressor start speed to C6 speed.
(Step S24)
The control unit 12 sets the compressor start speed to C4 speed.
(Step S27)
The control unit 12 sets the compressor start speed to C6 speed.
(Step S28)
The control unit 12 sets the compressor start speed to the C2 speed.

(Step S30)
The controller 12 determines whether or not the outside air temperature AT is 20 ° C. or higher.
When it determines with it being 20 degreeC or more, it transfers to step S31.
When it determines with it not being 20 degreeC or more, it transfers to step S35.
(Step S31, Step S35)
The control unit 12 determines whether or not the operation of the compressor 25 has performed a high load rank operation in the previous cycle.
If the predetermined speed C7 is reached in step S31, the process proceeds to step S32. If the predetermined speed C7 is not reached, the process proceeds to step S34.
If the predetermined speed C7 is reached in step S35, the process proceeds to step S36. If the predetermined speed C7 is not reached, the process proceeds to step S38.
(Step S32, Step S36)
The control unit 12 determines whether or not the operation time of the previous cycle is 130 minutes or longer.
In step S32, when the operation time is 130 minutes or longer, the process proceeds to step S33. If the operation time is not 130 minutes or more, the process proceeds to step S34.
In step S36, when the operation time is 130 minutes or more, the process proceeds to step S37. If the operation time is not 130 minutes or more, the process proceeds to step S38.

(Step S33)
The control unit 12 sets the compressor start speed to C6 speed.
(Step S34)
The control unit 12 sets the compressor start speed to the C3 speed.
(Step S37)
The control unit 12 sets the compressor start speed to C6 speed.
(Step S38)
The control unit 12 sets the compressor start speed to the C1 speed.

The user operates the buttons 54 and 55 installed on the refrigerator compartment door, and the temperature rank setting is changed or the outside air temperature fluctuates. In this way, the temperature rank setting and the outside air temperature fluctuate. However, basically, a control is adopted in which the speed of the compressor 25 increases stepwise.
That is, in the first embodiment, the speed of the compressor 25 increases stepwise until the detected temperature Tf of the freezer temperature sensor 53 reaches the compressor stop temperature Toff and the compressor 25 stops.

  For example, the case where the outside air temperature is 20 ° C. or more, the temperature rank is set to L, and the compressor 25 is started at the C5 speed and the temperature rank setting is changed or the outside air temperature is changed will be described as an example.

First, a case where the temperature rank setting is changed will be described.
Even when the user changes the temperature setting during operation and becomes the H setting, the speed of the compressor 25 shifts in stages, such as C5 speed to C6 speed, etc. until the compressor 25 stops. After the compressor 25 is stopped, if the temperature rank remains H until the temperature Tf detected by the freezer temperature sensor 53 reaches Ton and the compressor 25 starts up, the control shifts as follows. . That is, the control unit 12 performs control in the order of step S0, step S1, step S3, step S5, and step S8, determines the arrival speed of the compressor 25 in the previous cycle in step S31, and determines the previous time in step S32. The operation time of the cycle is determined, and the compressor starting speed is determined as C6 speed or C3 speed.

  On the other hand, the same is true when the outside air temperature AT fluctuates, and the speed of the compressor 25 shifts in stages until the compressor 25 stops, such as C5 speed to C6 speed. After the compressor 25 is stopped, if the detected temperature Tf of the freezer temperature sensor 53 reaches Ton and there is no change in the outside air temperature before the compressor 25 is started, the compressor starting speed is determined in the same way. The

At the time of setting L in FIG. 4, the starting speed C5 in step S14 and the starting speed C3 in step S18 correspond to the first starting speed, and the C6 speed in steps S13 and S17 correspond to the second starting speed. doing.
When M is set in FIG. 4, the start speed C4 in step S24 and the start speed C2 in step S28 correspond to the first start speed, and the C6 speed in steps S23 and S27 correspond to the second start speed. Yes.
At the time of setting H in FIG. 4, the start speed C3 speed in step S34 and the start speed C1 speed in step S38 correspond to the first start speed, and the C6 speed in steps S33 and S37 correspond to the second start speed. Yes.

[Change in compressor start-up speed due to load]
FIG. 5 shows changes over time in the compressor speed, the temperature detected by the freezer temperature sensor, and the temperature of stored items (food, etc.) stored in the freezer when a small load occurs. In FIG. 4, the method for determining the compressor starting speed has been described. The manner in which the compressor starting speed changes based on this determining method will be described.
In addition, the load applied to the refrigerator-freezer described here is, for example, (1) many times of opening / closing the door, (2) long / short time of opening the door for one door opening / closing, (3) warehouse This is due to factors that fluctuate when using refrigerators such as a large or small amount of stored goods, and (4) high or low temperature of stored goods.
In addition, (5) the thermal effect (the ambient air temperature setting value has a threshold value) due to the ambient temperature (outside temperature) of the refrigerator / freezer, and (6) the distance between the refrigerator / freezer and the surrounding wall (installed inside the outer box of the refrigerator / freezer) The influence of heat due to the ambient temperature rise due to the heat trapping of the heat radiating pipe is an environmental condition in using the refrigerator-freezer 100 and is therefore excluded from the load described here.

In FIG. 5, the operation cycle until the compressor 25 is started and stopped is divided into three, cycle 1, cycle 2 and cycle 3, respectively.
In cycle 1, the door remains closed, there is no entry of outside air, and no load is applied.
In the cycle 2, the door is opened, the outside air enters the cabinet, and a load is applied.
In the cycle 3, the door is opened and the load is applied continuously from the cycle 2, but the door is closed in the middle of the cycle 3 and the load is not applied.

(Cycle 1)
In cycle 1, a load such as outside air intrusion due to opening and closing of the door is not applied. For this reason, the compressor starts at the compressor speed C4 shown in Table 3 when the detected temperature Tf of the freezer temperature sensor 53 reaches Ton. Then, the compressor 25 stops when a predetermined time has elapsed since the start, for example, after 60 minutes, when the C5 speed is increased to the first speed and the detected temperature Tf of the freezer temperature sensor 53 reaches Toff.

(Cycle 2)
In cycle 2, a load is applied to the refrigerator-freezer. Since this load is low, the compressor 25 starts at C4 speed. Then, for example, after the elapse of 60 minutes, the C5 speed is achieved. Further, when the speed reaches C6 after 60 minutes, the temperature Tf detected by the freezer temperature sensor 53 reaches Toff and the compressor 25 stops.
It should be noted that the maximum temperature of the freezer storage product temperature is slightly higher in cycle 2 than in cycle 1 because of the load. In the cycle 2, it is necessary to cool this increased amount excessively, and the temperature in the freezer compartment immediately before the compressor stops is slightly higher than that immediately before the cycle 1 stops.

(Cycle 3)
In cycle 3, a load is applied as in cycle 2, but since this load is low, the compressor 25 starts at C4 speed. Then, for example, after the elapse of 60 minutes, the C5 speed is achieved. Further, when the speed reaches C6 after 60 minutes, the temperature Tf detected by the freezer temperature sensor 53 reaches Toff and the compressor 25 stops.
In cycle 3, since the load applied to the refrigerator-freezer continues from cycle 2, the maximum temperature of the freezer storage product temperature in cycle 3 is also higher than in cycle 1. However, since the load applied to the refrigerator-freezer is eliminated from the middle of cycle 3, the temperature in the freezer storage product can be lowered to substantially the same temperature as cycle 1 immediately before the compressor of cycle 3 is stopped.
In this way, at a low load, the temperature in the freezer compartment can be stably lowered even in a speed range of about C4 to C6.

FIG. 6 shows changes over time in the compressor speed, the detected temperature Tf of the freezer temperature sensor 53, and the temperature of the stored product stored in the freezer when a large load occurs. That is, FIG. 6 is an explanatory diagram of the change over time when a larger load than that in FIG. 5 is applied.
In FIG. 6, the operation cycle until the compressor is started and stopped is divided into five, namely cycle 1, cycle 2, cycle 3, cycle 4 and cycle 5, respectively.
In Cycle 1, Cycle 4 and Cycle 5, the door remains closed, there is no entry of outside air, and no load is applied. In the cycle 2, the door is opened, the outside air enters the cabinet, and a load is applied. In the cycle 3, the door is opened and the load is applied continuously from the cycle 2, but the door is closed in the middle of the cycle 3 and the load is not applied.

(Cycle 1)
Cycle 1 is the same as cycle 1 in FIG. 5, the door is closed, there is no entry of outside air, and no load is applied. For this reason, it is the same as the waveform of cycle 1 in FIG.

(Cycle 2)
Although it is cycle 2, a larger load is applied than in the case of FIG. 5, so that even if the compressor speed reaches C6 speed, the temperature detected by the freezer temperature sensor 53 does not decrease completely, and after reaching C9 speed, the freezer temperature The detected temperature Tf of the sensor 53 reaches Toff, and the compressor stops.
Here, the time for the compressor speed to shift from C4 speed to C5 speed, the time to shift from C5 speed to C6 speed, and the time to shift from C6 speed to C7 speed are set to 60 minutes, for example. Further, the time for shifting from the C7 speed to the C8 speed, the time for shifting from the C8 speed to the C9 speed, and the time for shifting from the C9 speed to the C10 speed are, for example, 30 minutes.

Here, a case where the cycle is completed up to C6 speed (low load rank) and the compressor stops is defined as a low load state. In addition, when the low load rank does not end the cycle and the speed reaches C7 speed or higher (high load rank), it is defined as a high load state.
The reason why the compressor shift time at the C7 speed or higher is set as early as 30 minutes instead of 60 minutes is because the C7 speed is used as a load threshold. That is, in the case of a high load state, compared with the low load state, it is assumed that the range of rise in the temperature of the freezer stored product is assumed to be large, so that the cooling capacity is increased. In response to this, the speed of the compressor 25 is increased, the temperature of the blown-out cool air is lowered, the stored product is cooled as soon as possible (temperature rise is suppressed), and the speed is changed faster than in the low load state.
Thus, the refrigerator-freezer 100 performs the load handling process which determines the speed of the compressor 25 based on the load state in the operation state from the operation start to the operation stop of the compressor 25 in the cycle 2. Can do.

(Cycle 3)
Immediately before the compressor of cycle 2 is stopped, the temperature Tf detected by the freezer temperature sensor 53 is cooled until it reaches Toff. The temperature does not drop until the temperature immediately before the machine stops.
Therefore, in cycle 3, the operation is switched from the low load operation to the high load operation. Specifically, the compressor starting speed is set higher than the C4 speed (low load state) that is the compressor starting speed of cycle 2 in FIG. That is, the compressor starting speed of cycle 3 is switched to C6 speed instead of C4 speed, and the rise in the stored product temperature is suppressed by increasing the cooling capacity from the time of starting the compressor.
Although the load applied to the refrigerator / freezer is eliminated in the middle of the cycle 3, since the C7 speed is reached even in this cycle, the speed at the start of the compressor in the next cycle 4 is also the C6 speed.
Here, the compressor operation time of cycle 4 is 120 minutes, and does not exceed a predetermined time, for example, 130 minutes, so the compressor start speed of cycle 5 returns to the C4 speed at the time of low load.

(Cycle 4)
In cycle 3, since the operation is switched to a high load state operation, the compressor starting speed in cycle 4 is also C6 speed. In FIG. 6, after reaching the C8 speed, the detected temperature Tf of the freezer temperature sensor 53 reaches Toff and the compressor stops.

(Cycle 5)
The controller 12 measures the operation time of the compressor in each cycle. Since the operation time in the cycle 4 is shorter than the predetermined time set in advance, the control unit 12 switches the operation from the high load state to the low load state. For this reason, in cycle 5, the compressor starting speed is C4 speed.

FIG. 7 shows the compressor speed, the detected temperature Tf of the freezer temperature sensor 53, and the temperature of the stored product stored in the freezer when a large load occurs without performing the speed control according to the first embodiment. It is time change. That is, FIG. 7 is an explanatory diagram in the case where a large load is generated in the refrigerator-freezer as in FIG. 6, but speed control is not performed unlike FIG.
In FIG. 7, cycle 1 and cycle 2 are the same as FIG.
In cycle 3, the compressor starting speed is C4 speed, and the speed is increased from this C4 speed. For this reason, the refrigeration capacity at the initial stage of cycle 3 is insufficient, and the temperature of the stored product has risen above the maximum temperature of cycle 2.
Further, even in cycle 4, since the compressor starting speed is C4 speed, the refrigeration capacity is still insufficient here, and the stored product temperature is higher than that in cycle 4 in FIG. It takes.

Note that the compressor speed in Table 1 described in the first embodiment has different heat leakage depending on the capacity and form of the refrigerator-freezer, and therefore the numerical value itself may be changed accordingly. In addition, although the speed stages in Table 1 are provided up to 10 stages (C1 speed to C10 speed), the stages may be appropriately reduced or increased.
In the first embodiment, the case where the compressor speed changes stepwise has been described as an example. However, the present invention is not limited to this, and the compressor speed may change in an inclined manner.

Further, in the first embodiment, as shown in Table 3, the speed of each temperature rank can be changed in a total of two stages above and below the threshold, but the present invention is not limited to this. For example, two or more threshold values may be provided, and the speed of each temperature rank may be changed in a total of three stages. Thereby, the starting speed of the compressor can be adjusted more finely.
Further, in the first embodiment, the case where the shift time is as shown in Table 4 has been described as an example. However, the present invention is not limited thereto, and may be changed depending on the capacity and form of the refrigerator-freezer.

[Modified example of determination method of compressor start-up speed]
FIG. 8 is a modification of the method for determining the compressor starting speed in FIG. In FIG. 8, steps S11, S15, S21, S25, S31, and S35 in FIG. 4 are designated as steps S11-1, S15-1, S21-1, S25-1, S31-1, and S35-1.
That is, in the determination method of FIG. 8, the determination condition of the arrival speed of the compressor 25 differs depending on whether the temperature rank is H setting, M setting, or L setting.
This is because, for example, when the setting is H and the outside air temperature is less than 20 ° C., it starts from the C1 speed at a low load, but it takes longer time to reach the C7 speed when starting from the C1 speed. It is.
Since the amount of heat leakage is low if the outside air temperature is low, it can be sufficiently cooled even at a relatively low speed. However, the specifications of the vacuum heat insulating panel 13 mounted on the refrigerator / freezer 100, the capacity of the compressor 25, the storage of the refrigerator / freezer 100 The setting may be changed when it is necessary to increase the speed of the compressor 25 relatively early even in low outside air due to the internal volume or the like.

[Effects of the refrigerator-freezer 100 according to Embodiment 1]
In the refrigerator-freezer 100 according to the first embodiment, when the generated load is a low load, the speed of the compressor 25 can be suppressed to give priority to energy saving (see FIG. 5), and is generated. When the load is high, the speed of the compressor 25 can be set higher to give priority to the suppression of the rise in the temperature of the stored item. In addition, the refrigerator-freezer 100 does not require a complicated program such as PID control, and the cost increase can be suppressed.
That is, the refrigerator-freezer 100 according to the first embodiment can stably suppress the temperature rise of stored items when a thermal load is generated while realizing cost increase suppression and low power consumption.

Embodiment 2. FIG.
In the second embodiment, the difference from the first embodiment will be mainly described. In the first embodiment, the compressor start speed is determined based on the “arrival speed of the compressor 25”. In the second embodiment, the blower fan start speed is determined based on the “arrival speed of the blower fan 24”. To do. That is, the control method of the compressor 25 according to the first embodiment corresponds to the control method of the blower fan 24 according to the second embodiment.
In the second embodiment, the room arrangement and configuration of the refrigerator-freezer 100 are the same as those in the first embodiment, and thus the description thereof is omitted.

[Operation of the blower fan 24]
Table 5 corresponds to Table 1 of the first embodiment, and instead of the speed of the compressor 25, the speed (rotation speed) of the blower fan 24 is set.
Table 6 is a table corresponding to Table 3 of the first embodiment, and whether the temperature detected by the outside air temperature sensor 10 is equal to or higher than a threshold value and the temperature rank (H, M, L) 24 shows that the startup speeds are different. In the second embodiment, the threshold value is set to 20 ° C. as an example.
Table 7 is a table corresponding to Table 4 of the first embodiment, and shows that the shifting time of the blower fan 24 varies depending on the temperature rank (H, M, L) and the speed rank (M1 to M10). Yes.

[How to determine the blower fan startup speed]
FIG. 9 is a flowchart of the method for determining the blower fan starting speed according to the second embodiment. FIG. 9 of the second embodiment is different from FIG. 4 of the first embodiment only in that the speed of the compressor 25 is the speed of the blower fan 24, and the others are the same.
That is, step S0 to step S38 correspond to step T0 to step T38, and the speed of the compressor 25 is replaced with the speed of the blower fan 24.

[Change in blower fan startup speed due to load]
FIG. 10 shows temporal changes in the blower fan speed, the detected temperature Tf of the freezer temperature sensor, and the temperature of the stored product stored in the freezer when a small load occurs. FIG. 11 shows changes over time in the blower fan speed, the temperature Tf detected by the freezer temperature sensor, and the temperature of the stored product stored in the freezer when a large load occurs. FIG. 12 illustrates the time of the fan speed, the detected temperature Tf of the freezer temperature sensor, and the temperature of the stored product stored in the freezer when a large load is generated without performing the speed control according to the second embodiment. It is a change.
10 to 11 correspond to FIGS. 5 to 7 of the first embodiment, and FIGS. 5 to 7 of the first embodiment only in that the speed of the compressor 25 is the speed of the blower fan 24. The other is the same.

[Variation of method for determining blower fan start speed]
FIG. 13 is a modification of the method for determining the compressor start speed in FIG. In FIG. 13, steps T11, T15, T21, T25, T31, and T35 in FIG. 9 are designated as steps T11-1, T15-1, T21-1, T25-1, T31-1, and T35-1.
That is, FIG. 9 of the second embodiment is shown in FIG. 13 in the same manner as FIG. 4 of the first embodiment is transformed into FIG. That is, in FIG. 13, the condition for determining the arrival speed of the blower fan 24 differs depending on whether the temperature rank is H setting, M setting, or L setting.

[Effects of the refrigerator-freezer according to Embodiment 2]
The refrigerator-freezer according to the second embodiment also has the same effect as that of the refrigerator-freezer 100 according to the first embodiment by controlling the speed of the blower fan 24 instead of the compressor 25.

Embodiment 3 FIG.
In the third embodiment, the difference from the first and second embodiments will be mainly described. In the third embodiment, the speed ranks of the compressor 25 and the blower fan 24 are handled as one body, and the integrated speed rank at the next start-up is determined.
2. Description of the Related Art Conventionally, techniques for responding only to the speed of a compressor have been proposed in order to suppress the temperature rise of stored items in a refrigerator. Decrease the temperature of the cool air (= increase the speed of the compressor and lower the temperature of the cooler) and increase the amount of the cool air blow (= increase the speed of the internal fan to reduce the circulating air volume of the internal cool air It is possible to suppress the temperature rise of the stored item, that is, to promote the heat exchange between the stored item and the cold air. That is, in the first and second embodiments, the control method independent of the compressor 25, the blower fan 24, and the speed is adopted, but in the third embodiment, the compressor 25 and the blower fan 24 are integrated with each other. The stage is set.
In the third embodiment, the room arrangement and configuration of the refrigerator / refrigerator are the same as those in the first embodiment, and are therefore omitted.

[Operations of Compressor 25 and Blower Fan 24]
Table 8 corresponds to Table 1 of the first embodiment and Table 5 of the second embodiment, and the speed ranks M1 to M10 corresponding to the speed of the compressor 25 and the speed of the blower fan 24 are set. .
Table 9 is a table corresponding to Table 3 of the first embodiment and Table 6 of the second embodiment. The detected temperature of the outside air temperature sensor 10 is equal to or higher than a threshold value, and the temperature rank (H , M, and L) indicate that the starting speed of the compressor 25 and the starting speed of the blower fan 24 are different. In the third embodiment, the threshold value is 20 ° C. as an example.
Table 10 is a table corresponding to Table 4 of the first embodiment and Table 7 of the second embodiment. According to the temperature rank (H, M, L) and the integrated speed rank (M1 to M10), the compressor 25 shows that the shift times of the fan 25 and the blower fan 24 are different.

  The control flowchart and the like are the same as those in the first and second embodiments, and the blower fan speed is also changed in synchronization with the compressor speed.

  DESCRIPTION OF SYMBOLS 1 Refrigeration room, 2 Ice making room, 3 Switching room, 4 Freezing room, 5 Vegetable room, 6 Heat insulation partition wall, 7 Refrigeration room door, 8 Temperature control panel, 9 Substrate, 10 Outside air temperature sensor, 11 Upper hinge apparatus part, 12 Control part, 13 Vacuum insulation panel, 14 Ice making case, 15 Switching room case, 16 Fan grill, 17 Inner box, 18 Cooler, 19 Defrost heater, 20 Drain pipe, 21 Evaporating dish, 22 Lower large storage case, 23 Upper shallow case, 24 blower fan, 25 compressor, 26 damper device for refrigeration room, 27 damper device for switching room, 28 heat insulating material, 29 lower storage case, 30 upper storage case, 31 refrigeration room return air path, 43 ~ 45 shelves, 46 accessory storage cases, 47 control panels, 48 resin parts, 49 foam duct parts, 50 duct parts, 51 temperature sensors , 52 switching room temperature sensor, 53 freezer room temperature sensor, 54 buttons, 55 buttons, 56 air passage holes, 57 pockets, 100 refrigerator-freezer.

Claims (8)

In a freezer refrigerator having a freezing room for freezing stored goods,
A compressor controlled by an inverter and capable of shifting in multiple stages;
A freezer temperature sensor for detecting the temperature of the freezer;
A control unit that stops the compressor when a detection result of the freezer temperature sensor is equal to or lower than a set lower limit value, and drives the compressor when equal to or higher than a set upper limit value;
Have
The controller is
When it is one operating cycle from driving the compressor to stopping it, the speed of the compressor is gradually increased from the first starting speed in the operating cycle,
When the speed of the compressor reaches a predetermined speed,
The refrigerator-freezer characterized by making the starting speed of the compressor of the operation cycle following the operation cycle which reached the predetermined speed into the 2nd starting speed higher than the 1st starting speed. The controller is
When the speed of the compressor reaches the predetermined speed, and the starting speed of the compressor is the second starting speed,
When the operation time of the operation cycle is within a predetermined time,
2. The refrigerator-freezer according to claim 1, wherein the starting speed of the compressor in the operating cycle next to the operating cycle that is within the predetermined time is returned to the first starting speed. An outside temperature sensor that detects the temperature of the space in which the refrigerator-freezer is installed;
The controller is
The refrigerator-freezer according to claim 1 or 2, wherein a value of the first start speed is determined based on a temperature detected by the outside air temperature sensor. Has a refrigeration room to refrigerate storage items,
The controller is
The value of said 1st starting speed is determined based on the temperature setting of the said refrigerator compartment and the said freezer compartment. The refrigerator-freezer as described in any one of Claims 1-3 characterized by the above-mentioned. In a freezer refrigerator having a freezing room for freezing stored goods,
A blower fan capable of shifting in multiple stages;
A freezer temperature sensor for detecting the temperature of the freezer;
A control unit that stops the blower fan when the detection result of the freezer temperature sensor is equal to or lower than a set lower limit value, and drives the blower fan when equal to or higher than a set upper limit value;
Have
The controller is
When the operation period from driving the blower fan to stopping is one operation cycle, the speed of the blower fan is increased stepwise from the first startup speed in the operation cycle,
When the speed of the blower fan reaches a predetermined speed,
The refrigerator-freezer characterized by making the starting speed of the ventilation fan of the operation cycle following the operation cycle which reached the predetermined speed into the 2nd starting speed faster than the 1st starting speed. The controller is
The speed of the blower fan reaches the predetermined speed, and the start speed of the blower fan is the second start speed,
When the operation time of the operation cycle is within a predetermined time,
The refrigerator-freezer according to claim 5, wherein the start-up speed of the blower fan in the operation cycle next to the operation cycle that is within the predetermined time is returned to the first start-up speed. An outside temperature sensor that detects the temperature of the space in which the refrigerator-freezer is installed;
The controller is
The refrigerator-freezer according to claim 5 or 6, wherein a value of the first startup speed is determined based on a temperature detected by the outside air temperature sensor. Has a refrigeration room to refrigerate storage items,
The controller is
The value of said 1st starting speed is determined based on the temperature setting of the said refrigerator compartment and the said freezer compartment. The refrigerator-freezer as described in any one of Claims 5-7 characterized by the above-mentioned.

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