JPH11304331A - Refrigerator control method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method of controlling a refrigerator in which the cooling capacity of each section of a freezing room and a refrigerator room is controlled to reduce temperature fluctuation. A refrigerating blower (54) for sending cool air to the refrigerating compartment (14) is provided on the refrigerating evaporator (50) side, and a refrigerating blower (56) for sending cool air to the freezing compartment (22) is provided on the refrigerating evaporator (52) side. Then, the rotational speed of the refrigeration blower 54 is increased or decreased according to the internal temperature of the refrigerator compartment 14, or the rotational speed of the compressor 46 is increased or decreased according to the internal temperature of the freezer compartment 22. The internal temperature is controlled to be within a predetermined temperature range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a refrigerator when cooling a refrigerator or a freezer.

[0002]

2. Description of the Related Art FIG. 12 shows a conventional duct configuration in which a refrigerator and a freezer are cooled by one evaporator. The flow of cold air in the refrigerator which is distributed to the refrigerator compartment 104 and cooled to the freezer compartment temperature zone and the refrigerator compartment temperature zone will be described.

[0003] First, the temperature of the freezing room 102 is controlled by the freezing room 1.
The inside temperature is measured by a freezing room sensor (not shown) installed in the inside of the evaporator 10 when the temperature is equal to or higher than the set upper limit temperature and the compressor is started to rotate the inside cooling fan 110.
The cool air cooled in step 8 is sent to the freezing room 102. Also,
When the temperature in the refrigerator falls below the set lower limit temperature, the compressor and the fan 110 are stopped to control so as to maintain a constant temperature having a certain width.

The temperature of the refrigerator compartment 104 is controlled by measuring the temperature in the refrigerator compartment by a refrigerator sensor (not shown) installed in the refrigerator compartment 104, and when the refrigerating cycle (compressor) is operating and higher than the set temperature, the damper is controlled. The device 112 opens and the evaporator 108
Is introduced through a duct to cool the refrigerator compartment 104. When the refrigeration cycle is stopped or lower than the set temperature, the damper device 112 is closed. The opening of the damper device 112 may be controlled by the difference between the set temperature and the internal temperature. Vegetable room 106 is refrigerated room 104
Cooled by cold air from If a special sensor / damper is installed in a special room for meat, fish, etc.,
The same temperature control as in step 04 is performed.

[0005] In some cases, when the temperature of the refrigerating compartment 104 rises, the control for operating the compressor is performed even when the freezing compartment 102 is cold.

[0006]

In these refrigerator configurations, since the cool air to the freezer compartment 102 is diverted by the damper device 112 and is cooled by flowing the cool air to the refrigerator compartment 104, the refrigerator compartment 104 is provided to the freezer compartment 102. Subordinate, freezer compartment 10
2 and the cooling capacity of the refrigerator compartment 104 cannot be controlled independently. Therefore, there is a problem that the freezing room 102 and the refrigerating room 104 cannot be controlled to an appropriate temperature with a small temperature fluctuation.

In a direct cooling system in which the refrigerating cycle has the same structure as that of FIG. 1 of the present invention and the refrigerating room is directly cooled by the evaporator 50 in the refrigerating room, the cooling capacity of the refrigerating room is the evaporator 50.
Is determined by the temperature of the refrigerator and the temperature difference in the refrigerator, the cooling capacity of the refrigerator compartment cannot be controlled, and the temperature can only be controlled by flowing or stopping the refrigerant. When the temperature control of the refrigerating compartment is finely performed, the switching of the refrigerant flow path is complicated, and there is a problem that the reliability of the switching valve is reduced.

Further, as shown in FIG. 13, in a refrigeration cycle in which a refrigerator compartment evaporator 120 and a freezer compartment evaporator 122 are connected in series and there is no refrigerant flow switching valve, only the freezer compartment evaporator 122 is provided. Therefore, there is a problem that when the load on the freezer compartment is large, only the freezer compartment cannot be efficiently cooled. Also,
Unless the compressor 124 is stopped, there is a problem that the refrigerator compartment evaporator 120 cannot be defrosted.

In view of the above problems, the present invention provides a method for controlling a refrigerator in which the cooling capacity of each compartment of a freezer compartment and a refrigerator compartment is controlled so as to reduce temperature fluctuations.

[0010]

According to a first aspect of the present invention, a compressor, a condenser, a refrigerating evaporator corresponding to a refrigerating room, and a refrigerating evaporator corresponding to a refrigerating room are connected in a ring shape. A refrigerant flow path is formed, and a refrigeration blower is provided on the refrigeration evaporator side, and a refrigeration blower is provided on the refrigeration evaporator side, and the number of revolutions of the refrigeration blower is increased or decreased according to the refrigeration room temperature. The control method of the refrigerator is characterized in that the number of revolutions of the compressor is increased or decreased to control the temperature in the refrigerator or freezer to be within a predetermined temperature range.

According to a second aspect of the present invention, a compressor, a condenser,
A refrigeration evaporator corresponding to the refrigerator compartment and a refrigeration evaporator corresponding to the freezer compartment are connected in a ring to form a refrigerant channel, and a refrigeration blower and a refrigeration evaporator are provided on the refrigeration evaporator side. Is provided with a refrigerating blower, and operates the refrigerating blower intermittently.

According to a third aspect of the present invention, a compressor, a condenser,
A refrigeration evaporator corresponding to the refrigerator compartment and a refrigeration evaporator corresponding to the freezer compartment are connected in a ring to form a refrigerant channel, and a refrigeration blower and a refrigeration evaporator are provided on the refrigeration evaporator side. Is provided with a refrigerating blower, and operates the compressor at a rotation speed of an allowable minimum rotation speed.

According to a fourth aspect of the present invention, when the refrigerator compartment temperature and the freezer compartment temperature reach their respective set lower limits, the compressor is stopped, and the refrigerator compartment temperature or the freezer compartment temperature rises to the set upper limit. 4. The method according to claim 3, wherein when the cooling operation is started, cooling is started at the rotation speeds of the compressor and the refrigeration fan used in the previous cooling operation.

According to a fifth aspect of the present invention, there is provided a compressor, a condenser,
A refrigeration evaporator corresponding to the refrigerator compartment and a refrigeration evaporator corresponding to the freezer compartment are connected in a ring to form a refrigerant flow path, and the refrigerant flow path is switched to allow the refrigerant to evaporate from the refrigeration evaporator for refrigeration. A valve that switches between the case of flowing to the refrigerator and the case of flowing only to the freezing evaporator is provided, and a refrigerator provided with a refrigeration blower on the refrigeration evaporator side and a refrigeration blower on the refrigeration evaporator side. If the temperature of the refrigerator reaches the set lower limit while the refrigerant is flowing through the refrigeration evaporator and the refrigeration evaporator, the valve is switched so that the refrigerant flows only through the refrigeration evaporator. Control to turn on the blower for cooling and to turn off the blower for refrigeration, and when the refrigerator compartment temperature reaches the set upper limit, the valve body is caused to flow the refrigerant to the evaporator for refrigeration and the evaporator for refrigeration. Switching, performing the second control for turning on the refrigeration blower and the constant temperature control mode A refrigerator control method characterized by and.

According to a sixth aspect of the present invention, after the valve is switched so that the refrigerant flows only to the refrigerating evaporator, the refrigerating blower is operated for a predetermined time or until the temperature of the refrigerating evaporator reaches a predetermined temperature. The method for controlling a refrigerator according to claim 5, wherein the refrigerator is rotated.

According to a seventh aspect of the present invention, the set temperature of the refrigerator compartment is set to 0.
7. The control method for a refrigerator according to claim 6, wherein the constant temperature control mode is performed when the temperature is set to a low temperature around ℃.

According to the eighth aspect of the present invention, the third control for turning off the refrigerating blower and turning on the refrigerating blower when the refrigerant flows only to the refrigerating evaporator, and for controlling the refrigerating refrigerant to the refrigerating evaporator and the freezing evaporator. 7. The control method for a refrigerator according to claim 6, wherein, when flowing into the evaporator, an alternate control mode including fourth control for turning on the refrigeration blower and turning off the refrigeration blower is performed.

According to a ninth aspect of the present invention, there is provided the control method for a refrigerator according to the eighth aspect, further comprising a switch for selecting between an alternate control mode and a constant temperature control mode.

According to a tenth aspect of the present invention, when the temperatures in the refrigerator compartment and the freezer compartment are higher than the respective set temperatures, the alternate control mode is performed, and the temperature in either the refrigerator compartment or the freezer compartment becomes lower. 9. The method according to claim 8, wherein a constant temperature control mode is performed when the temperature falls within a set temperature range.

According to the refrigerator control method of the first, third, and fourth aspects, by increasing or decreasing the number of revolutions of the refrigerating blower or increasing or decreasing the number of revolutions of the compressor, the inside temperature of the refrigerating room and the freezing room is increased. Can be controlled to target temperatures.

According to the control method of the refrigerator of the second aspect, the amount of heat exchange in the refrigeration evaporator can be controlled by intermittently operating the refrigeration blower.

According to the control method of the refrigerator of the fifth aspect, the non-cooling time of the refrigerator is shortened, and as a result, the temperature change of the refrigerator can be reduced.

According to the control method of the refrigerator of claims 6 to 10 and the control method of the refrigerator of the present invention, the defrosting of the refrigeration evaporator can be performed and the freezing of the food due to the temperature fluctuation can be prevented. The user can select a desired operation mode with a dedicated switch, and can provide a user-friendly refrigerator.
Further, it is possible to quickly cool down to the set temperature range.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
A description will be given based on FIG.

First, the structure of the refrigerator of the present invention is shown in FIG.
This will be described with reference to FIG.

FIG. 6 is a front view of the refrigerator 10 of the present embodiment, and FIG. 7 is a front view of the refrigerator 10 with each door opened.

As shown in FIGS. 6 and 7, the cabinet 12 which is the main body of the refrigerator 10 has a refrigerator room 1 from the top.
4, a vegetable room 16, a temperature switching room 18, and a freezing room 22 are provided. An ice making room 20 is located on the left side of the temperature switching room 18.
Is provided. And the vegetable room 16 and the temperature switching room 1
8. Between the ice making chamber 20, an insulating partition 24 is arranged.

The refrigerator compartment 14 is provided with a refrigerator compartment door 14a which is opened and closed by a hinge. In addition, this refrigerator room 1
In the lower part of 4, a chilled chamber 26 for maintaining the temperature in the refrigerator at about 0 ° C. is provided.

The vegetable compartment 16 is provided with a drawer-type vegetable compartment door 16a, with which the vegetable container 28 can be pulled out.

The temperature switching chamber 18 is provided with a draw-out type temperature switching chamber door 18a.
Can be pulled out.

The freezer compartment 22 also has a drawer-type freezer compartment door 22a.
Is provided, and the freezing container 32 can be pulled out together with the door.

As shown in FIG. 9, an ice making device 34 is provided near the ceiling of the ice making room 20, and an ice storage container 36 is provided below the ice making device 34.

The ice making device 34 comprises an ice tray 38, a driving unit 40 for rotating the ice tray 38, and an ice detecting lever 42 for detecting the amount of ice in the ice storage container 36. The tank 44 that supplies water to the ice tray 38 is provided on the left side of the chilled chamber 26.

As shown in FIG. 10, the condenser 62 is formed into a plate shape by being bent a plurality of times, and is disposed below the bottom of the freezing compartment 22 as shown in FIG. The accumulator 74 includes a refrigerating evaporator 5 as shown in FIG.
2 is attached to the right side.

Next, the refrigerator 1 will be described with reference to FIGS.
The structure and arrangement of the zero refrigeration cycle will be described.

First, as shown in FIG.
It is provided in the machine room 48 provided at the bottom of the cabinet 12, that is, at the rear lower part of the freezing room 22.

The evaporator of the refrigerator 10 has two types, one for refrigeration and the other for freezing.
The refrigerator evaporator 50 is disposed behind the vegetable compartment 16, and the freezing evaporator 52 is provided at the rear upper portion of the freezer compartment 22. A refrigeration blower 54 is provided above the refrigeration evaporator 50, and a refrigeration blower 56 is provided above the refrigeration evaporator 52. In addition, refrigeration evaporator 5
Below 0, a defrost heater 96 is provided. A defrost heater 98 is provided below the freezing evaporator 52.

The left side wall and the bottom plate of the temperature switching chamber 18 have a heat insulating structure. Thereby, the temperature switching chamber 1
Even if the inside temperature of the refrigerator 8 is set to the same temperature as that of the refrigerator compartment, there is no influence of the temperature from the freezer compartment 22 and the like existing around the refrigerator compartment. Further, since the back plate of the temperature switching chamber 18 also has a heat insulating structure, it is not affected by the temperature from the refrigerating evaporator 52.

FIG. 10 schematically shows the arrangement of the refrigeration cycle apparatus, and FIG. 11 is a block diagram showing the refrigerant flow path. Hereinafter, the flow of the refrigerant will be described with reference to FIGS. 10 and 11.

The refrigerant discharged from the compressor 46 is supplied to the muffler 5
8, through the heat radiating pipe 60, the condenser 62, the dew-proof pipe 64, and the dryer 66 to reach the three-way valve 68. In the three-way valve 68, the refrigerant flow path branches, one of which is directed to the refrigeration capillary tube 70, and the other is directed to the refrigeration capillary tube 72. From the refrigerating capillary tube 70 to the refrigerating evaporator 50, one is provided at the outlet side of the refrigerating capillary tube 72, and then to the refrigerating evaporator 52. Thereafter, the flow returns to the compressor 46 through the accumulator 74 and the suction pipe 76.

Next, the flow of cool air in the refrigeration cycle having the above-described configuration will be described with reference to FIGS.

First, the flow of the cool air cooled by the cooling evaporator 50 will be described.

The cool air cooled by the cooling evaporator 50 is sent by the cooling blower 54 to the cooling branch space 78 located behind the vegetable compartment 16. The upper portion of the refrigeration branch space 78 is connected to a refrigeration duct 80 provided on the back of the refrigeration compartment 14, and cool air is sent to the refrigeration duct 80. As shown in FIG. 8, the refrigeration duct 80 is bifurcated at the lower portion of the refrigeration compartment 14 and has a substantially U-shaped shape. Cool air outlets 82 are provided at predetermined intervals on the front surface of the refrigeration duct 80, and cool air is blown into the refrigeration compartment 14 from these outlets 82. The cool air that has cooled the refrigerating compartment 14 passes below the chilled compartment 26 and the tank 44 (see FIG. 9), and flows into return ducts 84 provided on the left and right sides of the refrigerating blower 54 and the refrigerating evaporator 50 (see FIG. 8). ), And is blown below the refrigeration evaporator 50. Then, the cool air is cooled again by the refrigeration evaporator 50 and reaches the position of the refrigeration blower 54.

On the other hand, from the refrigerated branch space 78, the vegetable room 1
6. Cold air is blown toward the lower rear part of
Is cooled (see FIG. 9). This cold air flows from the bottom of the vegetable container 28 toward the front, and reaches the return duct 88 provided inside the upper partition 86 separating the refrigerator compartment 14 and the vegetable compartment 16 (see FIG. 9). The return duct 88 is connected to the return duct 84, and the cool air that has cooled the vegetable compartment 16 also circulates below the refrigeration evaporator 50 (see FIG. 8).

Next, the flow of the cool air cooled by the freezing evaporator 52 will be described.

The refrigeration blower 56 cooled by the refrigeration evaporator 52 reaches the refrigeration branch space 90. The upper part of the freezing branch space 90 communicates with the ice making device 34, and cool air blows out from the upper part to the ice making device 34. The lower part of the freezing branch space 90 communicates with a hole 33 opened in the back plate of the freezing container 32 of the freezing room 22, and cool air blows out from the lower part toward the inside of the freezing container 32.

The cold air that has cooled the ice making chamber 20 flows to the front of the freezing chamber 22, and the cool air that has cooled the inside of the freezing container 32 of the freezing chamber 22 flows to the front of the freezing chamber 22. Then, the cool air flows downward along the front surface of the freezing container 32 and reaches the return duct 92 through the bottom. The cool air flowing into the return duct 92 is circulated to the freezing evaporator 52.

On the right side of the freezing branch space 90, a damper device 94 for sending cool air to the temperature switching chamber 18 is provided. By opening and closing the damper of the damper device 94, the amount of cold air sent to the temperature switching chamber 18 is adjusted. Then, the temperature in the refrigerator is adjusted. The cool air that has cooled the temperature switching chamber 18 is supplied to the temperature switching chamber 18.
Return duct 9 that leads from the bottom to the evaporator 52 for freezing
5 and circulates to a freezing evaporator 52.

(First Embodiment) Next, a first embodiment of a method for controlling the temperature of a refrigerator according to the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a cycle configuration of the refrigerator of the present invention, which is a simplified version of FIG. The high-temperature, high-pressure refrigerant exiting the compressor 46 is cooled by the condenser 62,
The refrigerant that has exited 2 is controlled by a three-way valve 68 to flow to either the refrigeration capillary tube 70 or the freezing capillary tube 72.

The refrigerating capillary tube 70 is connected to the refrigerating evaporator 50, and is connected to the refrigerating evaporator 52 through the connecting pipe 71. The freezing capillary tube 72 is directly connected to the freezing evaporator 52. The refrigerant that has exited the refrigeration evaporator 52 is supplied to the suction pipe 7
6 and return to the compressor 46.

When the refrigerant flows through the refrigeration capillary tube 70, it flows through both the refrigeration evaporator 50 and the refrigeration evaporator 52. When the refrigerant flows through the refrigeration capillary tube 72, it flows only through the refrigeration evaporator 52. It has become.

Although the three-way valve 68 is provided on the high pressure side in FIG. 1, the pressure is reduced to the intermediate pressure or the low pressure by the capillary tube, and at that stage, the flow of the refrigerant is controlled by the three-way valve, The flow of the refrigerant may be controlled by a single two-way valve by providing a difference in the flow resistance of the individual or capillary tubes.

FIG. 2 shows the flow of cold air in the refrigerator of the present invention. The refrigerator compartment 14 is provided with a refrigerator temperature sensor 15 for detecting the temperature inside the refrigerator. In addition, freezer 2
2 is also provided with a freezer compartment temperature sensor 23 for detecting the temperature in the refrigerator.

The cool air cooled by the cooling evaporator 50 is sent out to the refrigerator compartment 14 and the vegetable compartment 16 by the refrigerator blower 54. The cool air cooled by the freezing evaporator 52 is sent out to the freezing room 22 by the freezing blower 56.

FIG. 3 is a control block diagram showing the configuration of the temperature control of the present invention. FIG. 3 (a) is a control block diagram of the refrigerator compartment 14, and FIG. 3 (b) is a control block diagram of the freezer compartment 22. Each is shown.

In the refrigerator compartment 14, as shown in FIG.
The set temperature and the inside temperature information of the refrigerator compartment 14 by the refrigerator compartment temperature sensor 15 are input to the control device 57, and the output voltage is changed, thereby increasing or decreasing the rotation speed of the refrigerator blower 54 to evaporate the refrigerator. The amount of heat exchange in the vessel 50 is controlled to control the temperature in the refrigerator compartment 14 to be controlled.

In the freezer compartment 22, as shown in FIG. 3 (b), the set temperature and the in-compartment temperature information of the freezer compartment 22 by the refrigerating compartment temperature sensor 23 are input to the control device 59, and the output thereof (inverter). Thus, the refrigerating capacity is controlled by increasing or decreasing the rotation speed of the compressor 46, and the internal temperature of the freezing room 22 to be controlled is controlled.

By performing such control, the temperatures in the refrigerator compartment 14 and the freezer compartment 22 are controlled to the target temperatures, respectively. For example, if the door 14a of the refrigerator compartment 14 is opened and the temperature in the refrigerator rises, the rotation speed of the refrigerator blower 54 increases, the cooling capacity of the refrigerator compartment 14 increases, and as a result, the refrigerating capacity to the freezer compartment 22 decreases. That is, if the temperature in the freezer compartment 22 rises, the number of revolutions of the compressor 46 increases, the refrigerating capacity increases, and the temperature of the freezer compartment 22 is controlled to reach the target value. It should be noted that the same operation is performed when the door 22a of the freezer compartment 22 is opened and the internal temperature fluctuates.

In the example of the above control block diagram, the refrigerator compartment 14
And the freezing room 22 are individually controlled, but are actually affected by the cooling state of the other rooms. for that reason,
In order to control the temperatures of the refrigerating compartment 14 and the freezing compartment 22, the rotation speed of the refrigerating blower 54 and the binary value of the rotation speed of the compressor 46 are simultaneously controlled by one control device, and when one control element is moved, Considering the influence, the temperature of the two chambers may be controlled by appropriately moving other control elements.

Even in the case of individual control, hunting (for example, the cooling of the refrigerating compartment 14 is insufficient and the number of revolutions of the refrigerating blower 54 is increased → the distribution of the cooling capacity to the refrigerating compartment 14 becomes large and the freezing compartment 22 is not cooled → Increase the number of revolutions of the compressor 46 → lower the evaporating temperature → the refrigerator compartment 14 becomes too cold unless the number of revolutions of the refrigeration blower 54 is reduced → decrease the number of revolutions of the refrigeration fan 54 → increase the refrigerating capacity to the freezing chamber 22 → Temperature control in which the rotation speed of the refrigeration blower 54 and the rotation speed of the compressor 46 fluctuate little by little, such as excessive cooling of the freezer compartment 22 → decrease in the rotation speed of the compressor 46 → insufficient cooling of the refrigerator compartment 14 → first. The hunting can be minimized if the time constant is set appropriately so as not to cause the refrigeration compartment 14, for example, the feedback of the refrigerating compartment 14 is made early and the freezing compartment 22 is made slow.

[0061]

[Table 1] Table 1 shows the change in the representative point temperature in the refrigerator within a certain period of time when the door was not opened or closed when the temperature was controlled in the first embodiment of the present invention. The refrigerator compartment 14 and the freezer compartment 22 were alternately cooled. Case 1
This is a comparison of the temperature change of the cycle with its maximum and minimum values. (1) shows this embodiment, and (2) and (3) show the case of an embodiment described later.

In Table 1, “RF” of the refrigerant channel is
The state where the refrigerant is flowing through the refrigeration evaporator 50 and the refrigeration evaporator 52 is shown, and “Comp” indicates the compressor 46,
The rotation speed is 46 rpm. Further, “F fan” indicates a refrigeration fan 56, and “R fan” indicates a refrigeration fan 54.

As shown in Table 1 (1), the temperature fluctuation Δt in the refrigerator was 0.2 °, indicating that there was almost no temperature fluctuation in the refrigerator.

(Second Embodiment) Next, a second embodiment will be described. Generally, a DC brushless motor used for a fan can control the number of revolutions (torque) by controlling an applied voltage, but there is a limit to a range in which the speed can be varied. If the rotation speed is lower than a certain rotation speed, rotation cannot be performed stably. If the amount of heat exchange in the refrigerating evaporator is larger than the required amount of cooling even when rotated at the lower limit, the temperature of the refrigerating compartment will be too low. Therefore, by intermittently rotating the fan (refrigerator blower), the amount of air flowing to the refrigeration evaporator per unit time is reduced,
The effect of virtually reducing the rotation speed can be obtained.

When a refrigeration blower (fan motor) which is not a variable speed is used, the amount of heat exchange in the refrigeration evaporator can be controlled by intermittently operating the fan.

As a method for operating the refrigerating blower 54 intermittently, a method for turning on and off the fan input minutely in a time shorter than the time constant of the temperature change of the refrigerator, and a method for changing the temperature of the refrigerating room 14 as shown in FIG. There is a method to control with.

That is, as shown in FIG.
When the inside temperature of the refrigerator reaches the upper limit value (R setting upper limit in the figure), the refrigeration blower 54 is rotated (turned on), and the lower limit value (R in the figure)
This is a method of stopping (turning off) the refrigeration blower 54 when the lower limit is reached. Although there is a variation in the internal temperature of the temperature range set by the upper limit value and the lower limit value, the number of intermittent operations can be reduced as compared with the case where the intermittent operation of the refrigerating blower 54 is intermittently performed in the above short time.

However, at this time, if the stop time of the refrigeration blower 54 is long, there is a problem that the refrigeration evaporator 50 is cooled by the refrigerant and the vicinity of the evaporator is cooled by natural convection. Even if it does not rise, when the off-time of the refrigeration fan 54 reaches a certain time, the refrigeration fan 54 is operated and stopped when the lower limit is reached, so that the stop time of the refrigeration fan 54 does not become too long. I have to.

Table 1 (2) shows an example of the temperature change in this embodiment. Refrigerator blower 54 operates for 3.5 minutes, 16.5
The minute stop is repeated. By cooling the refrigerator compartment 14 in a cycle shorter than the alternating cooling to be compared, the temperature fluctuation is reduced (a temperature fluctuation of 0.4 degrees). Freezer compartment 22
Also, the temperature fluctuation is reduced by cooling continuously.

The alternate cooling (alternate mode) is a case in which the freezing room 22 and the refrigerating room 14 are alternately cooled. When the refrigerating room 14 is being cooled, the refrigerating blower 52 is stopped. The sending of cool air to the freezer compartment 22 is stopped.

(Third Embodiment) In this embodiment, the three-way valve 68 shown in FIG. 1 is switched so that the refrigerant flows through the refrigeration evaporator 50 and the refrigeration evaporator 52, and the blowers 54 and 56 in both sections are turned on. The two compartments (the refrigerator compartment 14 and the freezer compartment 22) are cooled by rotation.

At this time, the rotation speed of the refrigerating blower 54 in the refrigerating compartment 14 is controlled in a range in which the rotation speed is allowed to vary depending on the difference between the set temperature and the internal temperature. When the temperature of the refrigerating compartment 14 reaches the set lower limit, the three-way valve 68 is switched so that the refrigerant channel flows only to the refrigerating evaporator 52, and the refrigerating compartment 14 is stopped by stopping the refrigerating blower 54 so that the refrigerating compartment 14 is in a non-cooled state. become. When the temperature of the refrigerating compartment 14 reaches the set upper limit, the three-way valve 68 is switched to switch the refrigerant flow path to the original refrigerating evaporator 50 and freezing evaporator 52, and the refrigerating blower 54 of the refrigerating compartment 14 is turned on. By rotating, the refrigerator compartment 14 is cooled again. At this time, the refrigerating blower 56 is continuously rotating, and the refrigerant is always flowing to the refrigerating evaporator 52, so that the freezing compartment 22 is always cooled.

The case where the refrigerator compartment 14 and the freezer compartment 22 are alternately cooled (alternate mode) will be compared with FIG. The constant temperature mode shown in FIG. 5 is the cooling mode of the present embodiment. In addition,
The thick line in FIG. 5 is the constant temperature mode of the present embodiment, and the thin line is the alternate mode.

The refrigerator compartment 14 and the freezer compartment 22 in the constant temperature mode
In the mode in which both of the cooling modes are cooled, the cooling capacity of the refrigerating compartment 14 is lower than the lower limit of the number of revolutions of the refrigerating blower 54 and is smaller than the cooling capacity of the refrigerating compartment 14 in the alternating mode. Speed is small.

The heat is exchanged in the refrigeration evaporator 50 which cools the refrigeration compartment 14 having a high temperature.
Although the cooling capacity of No. 2 is small, the temperature rises, but the rising speed is slower than the temperature rise during no cooling in the alternate mode (when cooling the refrigerator compartment 14).

When the temperature of the refrigerator compartment 14 reaches the lower limit temperature, the mode of the refrigerator compartment 22 is switched to the cooling mode. Although the cooling capacity at that time is equal to the cooling capacity of the cooling mode of the freezing room 22 in the alternating mode, the lower limit in a shorter time than the time of the cooling mode of the freezing room 22 in the alternating mode due to the low internal temperature of the freezing room 22 at the start. Ends down to temperature. If the refrigerating compartment 14 does not cool down in this one cycle, the pattern of the first embodiment is adopted, and the temperature control is performed by increasing the rotation speed of the refrigerating blower 54.

If one cycle is the same time, the refrigerator compartment 1
4 Cooling time is longer, no cooling time is shorter,
As a result, it is possible to shorten the temperature change of the refrigerator compartment 14.

Table 3 (3) shows an example of the temperature change in this embodiment. The refrigeration blower 54 is repeatedly operated for 21 minutes and stopped for 24 minutes. By cooling the refrigerator compartment 14 in a cycle shorter than the alternating mode to be compared, the temperature fluctuation is reduced (the temperature fluctuation is 0.9 degrees). The freezing compartment 22 is also cooled continuously, so that the temperature fluctuation is reduced.

(Fourth Embodiment) Next, a fourth embodiment will be described. In the present embodiment, when the temperature of the freezing compartment 22 is lower than the set off temperature even if the refrigerating capacity of the compressor 46 is lowered to the minimum, the control is divided into the following two patterns.

When the refrigerator compartment 14 is also cold The refrigerator compartment 14 is cold, and the refrigerant flow path has already been switched,
When the refrigerating blower 54 is stopped and is not cooled, the compressor 46 and the refrigerating blower 56 are stopped.

The temperature inside the refrigerator compartment 14 and the temperature in the freezer compartment 2
The compressor 46 is restarted at the stage when one of the temperatures in the refrigerator reaches the ON temperature. At this time, when the cooling room 14 is started by a request from the refrigerator compartment 14, the cooling is started in a mode of cooling the freezing room 22 according to the following pattern 、. As the rotation speed of the compressor 46, the voltage of the refrigerating blower 56, and the like, the set values before the stop are used.

In the case where the refrigerator compartment 14 is not cooled In this pattern, the refrigerator 46 must be cooled, so that the compressor 46 cannot be stopped. for that reason,
The cooling capacity is controlled by stopping the refrigerating blower 56 and stopping the heat exchange by forced convection in the refrigerating evaporator 52. As a result, the temperature of the refrigerating room 14 decreases, and the state becomes the above-mentioned 〓, and the compressor 46 stops.

When the temperature of the refrigerator compartment 14 or the freezer compartment 22 rises to the set temperature required for cooling, the compressor 46 is started again, and the cooling is started in accordance with the section requiring cooling.

(Fifth Embodiment) In this embodiment, the refrigeration fan 54 is rotated even after the refrigerant flow path is switched to flow only the refrigeration evaporator 52 in the third embodiment. Sublimation and melting of the frost on the evaporator 50 for humidification, defrosting, and improvement of the temperature distribution in the refrigerator are achieved.

Until the temperature of the refrigeration evaporator 50 reaches the plus temperature of the frost formation or a certain time, the refrigeration blower 5
Drive 4 In addition, the inside temperature of the refrigerator compartment 14 is, for example,
When the temperature is as low as 1 to 2 ° C., even if the air in the refrigerating compartment 14 is circulated to the refrigerating evaporator 50, the air may not be completely melted. Defrosting according to 96) is required. Even in this case, the interior humidification is performed by sublimation.

[0086] Regarding the refrigerating evaporator 52, the temperature inside the refrigerator is low, so that defrosting as in this embodiment cannot be performed, and defrosting by heater heating (defrosting heater 98) is required.

(Sixth Embodiment) By the way, when the set temperature of the refrigerator compartment 14 is set to a low temperature near 0 ° C., if the temperature fluctuation is large, a part of the food in the refrigerator is frozen or the freezing and thawing are repeated. Therefore, the flavor of the food may be impaired. Therefore, in the present embodiment, when the user lowers the set temperature of the refrigerator compartment 14, control is performed to automatically enter the constant temperature mode in which the temperature fluctuation range is small.

(Seventh Embodiment) In this embodiment, a dedicated switch (not shown) that allows the user to switch between the normal alternating mode and the constant temperature mode control is provided, and the switch is provided according to the user's request. The constant temperature mode can be set arbitrarily.

(Eighth Embodiment) When the refrigerator is started by turning on the power switch, when the load suddenly increases due to the opening and closing of the door, etc., and when the temperatures in the refrigerator compartment 14 and the freezer compartment 22 are reduced. For example, when the temperature is higher than the temperature setting range, it is necessary to rapidly cool both the refrigerator compartment 14 and the freezer compartment 22.

In the alternate mode, when the refrigerator compartment 14 is cooled, it is not necessary to cool the refrigerating compartment 22 to cool the refrigerating compartment 22, so that the refrigerating capacity can be increased by increasing the refrigerating capacity by increasing the refrigerating capacity. Therefore, the total cooling capacity is larger than that of cooling the freezing compartment 22 at the same time, and the cooling can be quickly performed to the set temperature range. When the temperature falls within the set temperature range, a constant temperature mode is set.

As described above, the non-cooling time of the refrigerating compartment 14 is shortened by the control in the first to eighth embodiments, so that the fluctuation of the temperature inside the refrigerating compartment 14 can be reduced.

(Ninth Embodiment) Next, a ninth embodiment will be described. When the frost formed on the refrigeration evaporator 50 of the refrigeration compartment 14 is removed, the three-way valve 68 is switched so that the refrigerant flow path flows only to the refrigeration evaporator 52, the refrigeration evaporator 50 is not cooled, and defrosting is performed. The refrigeration evaporator 50 is heated by the heater 96 to perform defrosting. At this time, since the refrigerant is flowing to the freezing evaporator 52, the freezing room 22 can be cooled.

(Tenth Embodiment) When defrosting the frost of the freezing evaporator 52 in the freezing room 22, the refrigerating cycle (compressor 46) is stopped, and the freezing evaporator 52 is defrosted by the defrost heater 98. Heat to melt ice and defrost. At this time, since the refrigerant does not flow through the refrigeration evaporator 50, the refrigeration evaporator 50 can also be defrosted.

However, when the refrigeration evaporator 50 is also defrosted by the defrost heater 96 at the same time, the entire low pressure side of the compressor 46 is completely defrosted, for example, it rises to plus 10 ° C., so that the pressure on the low pressure side of the compressor 46 becomes A condensing pressure corresponding to that temperature results.

On the other hand, when only the refrigerating evaporator 52 is defrosted, the refrigerant pressure in the pipe on the low pressure side rises only up to the pressure corresponding to the temperature of the refrigerating evaporator 50. The pressure is lower than when defrosting. Therefore, since the suction pressure of the compressor 46 at the time of starting the compressor 46 after defrosting is low, the starting of the compressor 46 becomes easy.

As described above, by the control in the ninth and tenth embodiments, the defrost in the cycle of the refrigerator can be optimally performed.

[0097]

As described above, according to the refrigerator control method of the present invention, the cooling capacity of the refrigerator compartment and the cooling capacity of the freezer compartment can be respectively controlled, and the non-cooling time of the refrigerator compartment becomes shorter. Thereby, the fluctuation of the temperature inside the refrigerator compartment can be reduced. Furthermore, it is possible to optimally perform the defrosting of the cycle of the refrigerator.

[Brief description of the drawings]

FIG. 1 is a diagram showing a refrigerant flow path of a refrigeration cycle of the present invention.

FIG. 2 is a diagram illustrating a duct configuration of a flow of cold air inside the refrigerator according to the present invention.

FIG. 3 is a control block diagram for controlling the rotation speed of a refrigeration blower and a compressor according to the first embodiment of the present invention.

FIG. 4 is a diagram showing an operation pattern of a refrigeration blower according to a second embodiment.

FIG. 5 is a diagram illustrating an operation pattern and an example of a temperature change during a constant temperature mode and an alternate cooling according to a third embodiment.

FIG. 6 is a front view of a refrigerator showing one embodiment of the present invention.

FIG. 7 is a front view of the cabinet with the door opened.

FIG. 8 is a longitudinal sectional view at the rear of the refrigerator cabinet.

FIG. 9 is a sectional view taken along line AA in FIG. 6;

FIG. 10 is a layout view of each device constituting the refrigeration cycle.

FIG. 11 is a block diagram showing a refrigerant flow path.

FIG. 12 is a diagram showing a duct configuration of a flow of cold air inside a refrigerator in a conventional example.

FIG. 13 is a view showing a refrigerant flow path of another conventional refrigeration cycle.

[Description of Signs] 10 Refrigerator 14 Refrigerating room 22 Freezing room 46 Compressor 50 Refrigerating evaporator 52 Refrigerating evaporator 54 Refrigerating fan 56 Refrigerating fan 68 Three-way valve

Claims (10)

[Claims] 1. A refrigerant channel is formed by annularly connecting a compressor, a condenser, a refrigerating evaporator corresponding to a refrigerating room, and a refrigerating evaporator corresponding to a refrigerating room, thereby forming a refrigerant flow path. A refrigerator fan is provided on the refrigerator side, and a refrigerating fan is provided on the refrigerating evaporator side.The rotational speed of the refrigerating fan is increased or decreased according to the temperature of the refrigerating compartment, and the rotational speed of the compressor is varied depending on the temperature of the refrigerating compartment. A method for controlling a refrigerator, wherein the temperature in a refrigerator or a freezer is controlled to be within a predetermined temperature range. 2. A refrigerant channel is formed by annularly connecting a compressor, a condenser, a refrigerating evaporator corresponding to a refrigerating room, and a refrigerating evaporator corresponding to a refrigerating room to form a refrigerant flow path. A method for controlling a refrigerator, comprising: providing a refrigeration blower on a refrigerator side and a refrigeration blower on a refrigerating evaporator side; and intermittently operating the refrigeration blower. 3. A refrigerant channel is formed by annularly connecting a compressor, a condenser, a refrigerating evaporator corresponding to a refrigerating room, and a refrigerating evaporator corresponding to a refrigerating room to form a refrigerant flow path. A method for controlling a refrigerator, comprising: a refrigerator blower provided on a refrigerator side; and a freezer blower provided on a refrigerating evaporator side, wherein the compressor is operated at an allowable minimum rotation speed. 4. The compressor is stopped when the refrigerator compartment temperature and the freezer compartment temperature reach the respective set lower limit values, and when the refrigerator compartment temperature or the freezer compartment temperature rises to the set upper limit value, 4. The control method for a refrigerator according to claim 3, wherein the cooling is started at the rotation speed of the compressor and the refrigeration fan used in the previous cooling operation. 5. A refrigerant channel is formed by annularly connecting a compressor, a condenser, a refrigerating evaporator corresponding to a refrigerating room, and a refrigerating evaporator corresponding to a refrigerating room to form a refrigerant channel. A valve is provided to switch the refrigerant flow from the refrigeration evaporator to the refrigeration evaporator and to the refrigeration evaporator only.The refrigeration evaporator side has a refrigeration blower and refrigeration evaporator. A refrigerator provided with a freezer blower on the side of the refrigerator. If the temperature of the refrigerator reaches the set lower limit while the refrigerant is flowing through the refrigerator evaporator and the refrigerator evaporator, the refrigerator is used for freezing. The first control that switches the valve body so that it flows only to the evaporator, turns on the refrigerating blower, and turns off the refrigerating blower. The second control is to switch the valve body so that it flows to the chiller and refrigeration evaporator, and to turn on the refrigeration blower. A method for controlling a refrigerator, comprising: performing a constant temperature control mode comprising: 6. A refrigeration blower is rotated for a certain period of time or until the temperature of the refrigeration evaporator reaches a predetermined temperature after switching the valve body so that the refrigerant flows only to the refrigeration evaporator. The method for controlling a refrigerator according to claim 5, wherein 7. The control method for a refrigerator according to claim 6, wherein the constant temperature control mode is performed when the set temperature of the refrigerator compartment is set to a low temperature around 0 ° C. 8. When the refrigerant flows only through the refrigerating evaporator, the third step is to turn off the refrigerating blower and turn on the refrigerating blower.
And a fourth control for turning on the refrigeration blower and turning off the refrigeration blower when the refrigerant flows through the refrigeration evaporator and the refrigeration evaporator. The method for controlling a refrigerator according to claim 6. 9. The method of controlling a refrigerator according to claim 8, further comprising a switch capable of selecting between an alternate control mode and a constant temperature control mode. 10. When the internal temperature of the refrigerator compartment or the freezer compartment becomes higher than the set temperature, an alternate control mode is performed, and the internal temperature of either the refrigerator compartment or the freezer compartment falls within the set temperature range. 9. The control method for a refrigerator according to claim 8, wherein a constant temperature control mode is performed when the temperature is changed.