KR101152070B1 - Refrigerator - Google Patents

Abstract

An object of the present invention is to obtain a refrigerator having improved energy saving property by controlling the air blowing to the refrigerating chamber and the freezing chamber.
A refrigeration temperature compartment and a refrigeration temperature compartment defined in the refrigerator main body, a compressor installed in a machine room provided at the rear of the refrigeration temperature compartment, a cooler provided in a cooler chamber provided at the rear of the refrigeration temperature chamber, and a A blower installed at an upper side to blow cold air into the refrigerating temperature chamber and the refrigerating temperature chamber, a refrigerating chamber damper for controlling a supply amount of cold air to the refrigerating temperature chamber, and a freezer compartment for controlling the supply amount of cold air to the refrigerating temperature chamber. A damper, and when the compressor is stopped, performing a first operation of driving the blower in a state in which the freezer compartment damper is closed and the refrigerating compartment damper is opened, and after the first operation, the freezer compartment damper is closed and the refrigerating compartment is closed. A second operation of driving the blower by driving the compressor in an open state of a damper; Characterized in that for performing.

Description

Refrigerator {REFRIGERATOR}

The present invention relates to a refrigerator.

The control method of the refrigerator provided with the ventilation control means which is a steam compression type | mold refrigerator which cools a refrigerating compartment and a freezer compartment by a single cooler, and which can control opening and closing of the ventilation to a refrigerator and a freezer compartment, for example is patent document shown below. The technique disclosed in 1 is known.

In Patent Literature 1, a lower limit, an upper limit set temperature of a refrigerating compartment, a lower limit and an upper limit set temperature of a refrigerating compartment are stored in advance in a storage device, and the internal temperature of the refrigerator is measured by a temperature sensor installed in the refrigerating compartment and the freezing compartment, respectively, and the measured value and the refrigerating compartment are measured. Control of opening / closing control of the opening / closing control means of the freezer compartment and the refrigerating compartment, starting / stopping of the compressor, starting / stopping of the blower, and the like based on the comparison result of the lower limit, the upper limit set temperature of the freezer compartment and the freezer compartment. .

8 is a time chart of the refrigerator controlled by the control method disclosed in Patent Document 1. FIG. As shown in FIG. 8, the refrigerator disclosed in Patent Document 1 initially cools both the refrigerating chamber and the freezing chamber in a state of "compressor ON, refrigerating chamber damper opening, freezing chamber damper opening, and cooler blower on". In time t1, since the refrigerator compartment lower limit temperature b memorize | stored previously was reached, the refrigerator compartment damper is closed.

Therefore, the state of "compressor on, refrigerating chamber damper closing, freezing chamber damper opening, cooler blower on" continues, and only the freezing chamber is cooled, and the refrigerating chamber temperature is rising. Next, at time t2, the freezer compartment temperature reached the freezer compartment lower limit temperature d previously stored, and the refrigerator compartment temperature reached the refrigerator compartment upper limit temperature a previously stored, so that the compressor is turned off and the refrigerator compartment damper is opened. , Freezer damper closure, cooler blower on ”. As a result, the refrigerating chamber is cooled by the cooling heat of frost grown in the cooler, and the temperature is lowered. On the other hand, the freezing chamber is not cooled, so the temperature is rising.

In addition, defrost load decreases because frost melts by this operation. At time t3, the freezer compartment temperature reached the freezer compartment upper limit temperature c previously stored, and the refrigerator compartment temperature reached the refrigerator compartment lower limit temperature b previously stored. Closed, the blower for the cooler " " At time t4, the freezer compartment temperature reaches the freezer compartment lower limit temperature d previously stored, while the refrigerator compartment temperature rises, but does not reach the refrigerator compartment upper limit temperature a previously stored. , The freezer compartment damper is closed, and the blower for the cooler is turned off, and the freezer compartment and the refrigerating compartment are both not cooled, and the temperature rises. As mentioned above, it controls based on the lower limit and upper limit set temperature of a refrigerator compartment, and the lower limit and upper limit set temperature of a freezer compartment.

[Patent Document 1] Japanese Patent No. 3484131

However, in the above conventional technology, since a refrigerator is usually operated within a range of a lower limit, an upper limit set temperature of the refrigerating chamber, and a lower limit, upper limit set temperature of the freezer compartment, the basic function as a refrigerator to maintain the interior at a predetermined temperature is satisfied. It was not high enough. The reason for this is described below.

In consideration of the refrigeration cycle of the vapor compression refrigerator, in general, when the heat dissipation performance was sufficient, increasing the evaporation temperature in the refrigerator (increasing the evaporation pressure) results in the performance factor [= freezing capacity (cooling capacity) / compressor power. Effective for improvement. In other words, if the evaporation temperature can be increased, the required cooling capacity can be obtained with less compressor power, thereby saving energy. Therefore, when considering the control of the refrigerator, it is necessary to consider that the inside of the refrigerator can be cooled by making the evaporation temperature as high as possible. The evaporation temperature is determined so that the endothermic amount (determined from the latent heat of evaporation and the refrigerant circulation amount) of the refrigerant flowing in the cooler is balanced with the amount of heat transfer that deprives the cool heat from the cooler (transmitting heat to the cooler). Therefore, in order to raise evaporation temperature, it becomes effective to take away more cold heat from a cooler (increasing heat transfer amount).

From this point of view, the prior art again shows that up to t1 in Fig. 8, since both the refrigerator compartment damper and the freezer compartment damper are open, they are ventilated to both the refrigerator compartment and the freezer compartment. Therefore, the return cooling air from the refrigerating chamber and the return cooling air from the freezing chamber are mixed and introduced into the cooler.

In general, when the refrigerating chamber and the freezing chamber are blown at the same time, since the air path is formed so that more cold air is distributed to the freezer compartment side, a large amount of return cold air from the low temperature freezer compartment flows into the cooler. Therefore, since the temperature of the air depriving the cooling heat from the cooler is low, the evaporation temperature is balanced at a low temperature (typically at about freezer temperature). Although the refrigerating chamber is a good room to be maintained at a positive temperature of about 3 to 5 ° C., operating at a low temperature evaporation temperature similar to that of the freezing chamber is cooled in a state where the coefficient of performance of the refrigerating cycle is low as described above. It must be doing. Therefore, in the above prior art, since the cooling operation is only performed based on the lower limit, the upper limit set temperature of the refrigerating chamber, and the lower limit, the upper limit set temperature of the freezer compartment, the damper for the refrigerator compartment and the freezer compartment, which have low coefficients of performance of the refrigerating cycle. Cooling in the open state of all the dampers was easy to be performed. Therefore, energy savings did not become high enough.

Next, with respect to t2 to t3, the refrigerating chamber is cooled by frost cooling and the like in the state of "compressor off, refrigerating chamber damper opening, freezing chamber damper closing, cooler blower on". In Fig. 8, at t3, the lower limit temperature of the refrigerating compartment and the upper limit temperature of the freezing compartment are at the same time. However, if there is a change in the heat load such as changing the outside temperature of the refrigerator, the lower limit temperature of the refrigerating compartment is reached. The time changes. Therefore, in some cases, the freezer compartment may reach the upper limit temperature before the refrigerator compartment reaches the lower limit temperature. In this case, not only the refrigerating chamber but also the freezing chamber must be cooled, so that the above-mentioned refrigerating chamber damper and the freezing chamber damper are both cooled in the open state. That is, in t2 to t3, since the control for avoiding the maximum simultaneous cooling operation of the refrigerating compartment and the freezing compartment with low energy saving is not performed, the energy saving is not sufficiently high.

In addition, in FIG. 8, after operation | movement of "compressor off, refrigerating chamber damper opening, freezing chamber damper closing, and cooler blower on" of t2-t3, "compressor on, refrigerating chamber damper closing, freezing chamber damper opening, cooler blower" of t3-t4. Although the operation | movement which cools a freezer compartment of "on" is performed, the order of such operation was a factor which cannot make energy saving fully high. That is, in the above prior art, only the cooling operation is performed based on the lower limit, the upper limit, and the lower limit, the upper limit, of the refrigerating chamber, and in order to improve the energy saving. There was not consideration such as to appear.

This invention is made | formed in view of the said subject, and an object of this invention is to obtain the refrigerator which improved energy saving property by controlling the air flow to a refrigerator compartment and a freezer compartment.

In order to achieve the above object, the present invention provides a refrigeration temperature compartment and a refrigeration temperature compartment compartment formed in the refrigerator main body, a compressor installed in a machine room installed at the rear of the refrigeration temperature compartment, and a cooler chamber installed at the rear of the refrigeration temperature compartment. A cooler, a blower installed above the cooler in the cooler chamber, for blowing cold air into the refrigerating temperature chamber and the refrigerating temperature chamber, a refrigerating chamber damper for controlling the supply amount of cold air to the refrigerating temperature chamber, and the freezing temperature. A freezer compartment damper for controlling the supply amount of cold air to the large chamber, and performing a first operation of driving the blower in a state in which the freezer compartment damper is closed and the refrigerator compartment damper is opened when the compressor is stopped, and the first operation is performed. The compressor is operated after closing the freezer compartment damper and opening the refrigerating compartment damper. W is as claim 2, wherein performing the operation for driving the blower.

And a freezing compartment temperature sensor for detecting the temperature of the freezing compartment, and shifting from the first operation to the second operation based on the detection temperature of the freezing compartment temperature sensor.

The refrigerator may further include a refrigerator compartment temperature sensor that detects a temperature of the refrigerator compartment, and stops the blower when the detection temperature of the refrigerator compartment temperature sensor reaches a preset temperature during the first operation.

A cooler temperature sensor for detecting the temperature of the cooler is provided, and the blower is stopped based on the detection temperature of the cooler temperature sensor during the first operation.

The set temperature of the cooler for stopping the blower during the first operation is switched on the basis of the detection temperature of the refrigerating compartment temperature sensor at the start of the first operation.

Further, after the second operation, a third operation of driving the blower is performed by closing the refrigerator compartment damper and opening the freezer compartment damper in a state where the compressor is driven.

In addition, the cooler is characterized in that the temperature is higher during the second operation than during the third operation.

And a means for detecting opening and closing of the door of the refrigerating compartment, and when the opening and closing of the door of the refrigerating compartment is detected during the third operation, the set temperature of the refrigerating compartment is increased.

In addition, the blower is stopped while the compressor is driven for a predetermined time between the second operation and the third operation, and the air is not blown to the refrigerating temperature chamber and the refrigerating temperature chamber.

According to the present invention, by controlling the air blowing to the refrigerating chamber and the freezing chamber, it is possible to obtain a refrigerator with improved energy saving.

1 is a front external view of a refrigerator according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along line XX in FIG. 1 showing the constitution of the refrigerator of the refrigerator according to the embodiment of the present invention. FIG.
The front view which shows the structure in the inside of the refrigerator of embodiment of this invention.
4 is an enlarged explanatory diagram of a main part of FIG. 2;
5 is an enlarged explanatory diagram of a main part of FIG. 3;
6 is a flowchart showing control of the refrigerator according to the embodiment of the present invention;
7 is a time chart showing control of the refrigerator according to the embodiment of the present invention;
8 is a time chart showing control of a conventional refrigerator.

An embodiment of a refrigerator according to the present invention will be described with reference to FIGS. 1 to 7.

1 is a front external view of the refrigerator of the present embodiment, FIG. 2 is a XX longitudinal cross-sectional view in FIG. 1 showing the configuration of the refrigerator, and FIG. 3 is a front view showing the configuration of the refrigerator in the refrigerator. It is a figure which shows the arrangement | positioning of a blower opening, etc. FIG. 4: is explanatory drawing of the principal part of FIG. 5 is an enlarged explanatory diagram of a main part of FIG. 3.

As shown in FIG. 1, the refrigerator 1 of this embodiment is comprised from the refrigerating chamber 2, the ice-making chamber 3, the upper freezer chamber 4, the lower freezer chamber 5, and the vegetable chamber 6 from upper direction. have. In addition, in this specification, the generic name of the ice-making chamber 3, the upper end freezing chamber 4, and the lower end freezing chamber 5 may be called the freezing chamber 60 here.

The refrigerating compartment (2) is provided with a two-door open refrigerating compartment doors (2a, 2b) on the front side, the ice making chamber (3), the upper freezer compartment (4), the lower freezer compartment (5), the vegetable compartment (6) And a drawer-type ice maker door 3a, an upper freezer door 4a, a lower freezer door 5a, and a vegetable compartment door 6a, respectively. Hereinafter, the refrigerator compartment doors 2a and 2b, the ice making chamber door 3a, the upper freezer door 4a, the lower freezer compartment door 5a, and the vegetable compartment door 6a are simply the doors 2a, 2b, 3a, 4a and 5a. 6a).

In addition, the refrigerator 1 is a door sensor (not shown) which detects the opening / closing state of each door of the doors 2a, 2b, 3a, 4a, 5a, and 6a, respectively, and the state determined as the door opening state is a predetermined time, for example. For example, when it continues for more than 1 minute, it is equipped with the not-shown alarm which notifies a user, the temperature setter which sets the temperature of the refrigerating compartment 2 or the vegetable compartment 6, and the temperature setting of the freezer compartment 60, etc. Doing.

As shown in FIG. 2, the outside and inside of the refrigerator 1 are partitioned by the heat insulation box 10 formed by filling a foam heat insulating material (foamed polyurethane). The heat insulation box 10 of the refrigerator 1 mounts the some vacuum heat insulating material 25. As shown in FIG.

The inside of the chamber is divided into a refrigerator compartment 2, an upper freezer compartment 4 and an ice making chamber 3 (see FIG. 1, the ice making chamber 3 is not shown in FIG. 2) by an adiabatic partition wall 28, The lower freezer compartment 5 and the vegetable compartment 6 are partitioned by the heat insulation partition wall 29.

A plurality of door pockets 32 are provided on the inner side of the doors 2a and 2b (see FIG. 1). In addition, the refrigerating chamber 2 is partitioned into a plurality of storage spaces in the longitudinal direction by the plurality of shelves 36.

As shown in FIG. 2, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6 are integral with the doors 3a, 4a, 5a, and 6a provided in front of each chamber. 3b, 4b, 5b, and 6b are provided, respectively, so that the storage containers 4b, 5b, and 6b can be taken out by walking on the handles (not shown) of the doors 4a, 5a, and 6a and pulling them toward the front side. It is. Similarly, in the ice-making chamber 3 shown in FIG. 1, the storage container (indicated by (3b) in FIG. 2) which is not shown in figure is integrally provided with the door 3a, and the handle part which is not shown in the door 3a is shown. It is possible to take out the storage container 3b by making a hand pull to the front side.

As shown in FIG. 2 (appropriately see FIGS. 3 to 5), the cooler 7 is provided in the cooler storage chamber 8 provided in the substantially rear portion of the lower freezer compartment 5, The cold air (cold air, hereinafter referred to as cold air generated by the cooler 7), which is cooled by heat exchange with the cooler 7 by an internal blower (blower) 9 installed above is a cold room blower duct 11 The refrigerating chamber (2), the upper freezing chamber (4), the lower freezing chamber (5) and the ice making chamber (3) via the upper freezing chamber blowing duct 12, the cold freezing air duct 13 as the lower freezing chamber blowing duct, and an ice making chamber blowing duct not shown. Are sent to each thread. Blowing into each chamber is controlled by opening and closing the refrigerating chamber cooling damper 20 and the freezing chamber cooling damper 50.

In addition, each blowing duct of the refrigerating chamber 2, the ice-making chamber 3, the upper freezer compartment 4, and the lower freezer compartment 5 is shown to the back side of each chamber of the refrigerator 1 as shown with the broken line in FIG. It is installed.

Specifically, when the refrigerating compartment cooling damper 20 is in an open state and the freezer compartment cooling damper 50 is in a closed state, the cool air is sent to the refrigerating compartment 2 from a blower outlet 2c provided in multiple stages via the refrigerating compartment blowing duct 11. Lose. After the refrigerating of the refrigerating compartment is finished, it flows in from the refrigerating compartment return port 2d provided in the lower right side of the refrigerating compartment rear side, and passes through the refrigerating compartment-vegetation chamber communication duct 16 and is provided at the upper right side of the rear of the vegetable compartment 6. It flows in from the vegetable chamber 6, and cools it. The cold air which cooled the vegetable chamber is from the vegetable chamber return opening 6d provided in front of the lower part of the heat insulation partition wall 29 through the vegetable chamber return duct 18, and the vegetable chamber return discharge port 18a of the width substantially equal to the width of the cooler 7 ), See FIG. 3 or 5.

In FIG. 3, the freezer compartment cooling damper 50 is omitted. However, when the freezer compartment cooling damper 50 is in an open state, the cold air heat-exchanged in the cooler 7 is not shown by the air blower 9 in the refrigerator. Blowing through the upper freezer compartment blowing duct 12 from the blower outlets 3c and 4c to the ice making chamber 3 and the upper freezer compartment 4 respectively, and passing through the cold air duct 13 from the blower outlet 5c to the upper freezer compartment 4. It is blown. In general, since cold air, which is low in temperature to ambient temperature, forms a downward flow from above to downward, the cold air can be favorably cooled by supplying more cold air above the chamber. In the refrigerator of this embodiment, although the freezer compartment cooling damper is provided, by installing this above the air blower in the refrigerator, the air flow from the inside blower is smoothly provided, and the ice-making chamber 3 and the upper freezer compartment located in the upper end of the freezing temperature chamber ( 4) It is considered to be able to blow air in.

As shown in FIG. 5, the cold air having cooled the refrigerator compartment 2 flows into the vegetable compartment 6 through the refrigerator compartment-vegetable compartment communication duct 16 provided on the side of the cooler storage compartment 8. The return cooling air from the vegetable chamber 6 flows in from the vegetable chamber return opening 6d (refer FIG. 2), and as shown in FIG. 4, through the vegetable chamber return duct 18 provided in the heat insulation partition wall 29, It flows into the cooler storage chamber 8 from the vegetable chamber return discharge port 18a (refer FIG. 5) of the width dimension substantially equal to the width of the cooler 7, provided in front of the lower part of the cooler storage chamber 8. On the other hand, the cold air which cooled the freezing chamber 60 of the cooler 7 provided in the lower part of the partition plate 54 which divides the cooler storage chamber 8 and the freezing chamber 60, as shown in FIG. It enters the cooler accommodating chamber 8 through a freezer compartment return port 17 having a width dimension approximately equal to the width. The defrost heater 22 is provided below the cooler storage chamber 8. The defrost heater 22 is a glass tube heater, and the heat dissipation fin 22a made of aluminum is provided in the outer periphery of a glass tube. The upper cover 53 is provided above the defrost heater 22 in order to prevent defrost water from dripping on the defrost heater 22.

After the defrost water attached to the wall of the cooler 7 and the surrounding cooler storage chamber 8 is melted by the defrost, the defrost water flows into the trough 23 provided in the lower part of the cooler storage chamber 8, It reaches the evaporating dish 21 arrange | positioned in the machine room 19 later through the drain pipe 27, and is evaporated by the heat generation of the compressor 24 and the condenser which is not shown in the machine room 19.

In addition, from the front of the cooler 7, the cooler temperature sensor 35 mounted on the cooler at the upper left side, the refrigerating compartment temperature sensor 33 at the refrigerating compartment 2, and the freezer compartment temperature sensor 34 at the lower freezer compartment 5, respectively. And a temperature of the cooler 7 (hereinafter referred to as a cooler temperature), a temperature of the refrigerator compartment 2 (hereinafter referred to as a refrigerator compartment temperature), and a temperature of the lower freezer compartment 5 (hereinafter referred to as a freezer compartment temperature), respectively. It can be detected. Moreover, the refrigerator 1 is equipped with the outside air temperature sensor which is not shown in figure which detects the outside temperature. The vegetable chamber temperature sensor 33a is also arranged in the vegetable chamber 6.

In addition, in this embodiment, isobutane is used as a refrigerant | coolant, and refrigerant | coolant sealing amount is made into a small quantity about 80 g.

On the upper surface side of the ceiling wall of the refrigerator 1, a control board 31 mounted with a memory such as a CPU, a ROM, a RAM, an interface circuit, or the like is disposed (see FIG. 2), and the control board 31 is an outside air temperature sensor. The opening and closing states of the doors of the cooler temperature sensor 35, the refrigerator compartment temperature sensor 33, the vegetable compartment temperature sensor 33a, the freezer compartment temperature sensor 34, and the doors 2a, 2b, 3a, 4a, 5a, and 6a By connecting to the above-described door sensor, a temperature setter (not shown) installed on the inner wall of the refrigerating chamber 2, a temperature setter not shown on the inner wall of the lower freezer compartment 5, and the like, respectively, Control of the compressor 24 on and off, control of each of the actuators not shown, which individually drive the refrigerator compartment cooling damper 20 and the freezer compartment cooling damper 50, and on / off control of the blower 9 in the refrigerator. Rotational speed control, alarm on / off for notifying the door opening state Control is performed.

Next, control of the cooling operation of the refrigerator of the present embodiment will be described with reference to FIG. 6. 6 is a control flowchart showing basic control of the refrigerator of the present embodiment. Control is performed by the CPU of the control board 31 (refer FIG. 2) executing a program stored in ROM.

As shown in Fig. 6, the refrigerator starts operation by turning on the power (starting), and each room in the refrigerator is cooled, and the basic heat load is only the heat intrusion from the outside. When the door is opened or closed to increase the heat load, or the outside temperature and humidity environment is changed, and the heat intrusion amount is not changed, the constant operation pattern is repeated (stable cooling operation). In FIG. 6, the control process up to this stable cooling operation state is abbreviate | omitted. In addition, since the control based on the temperature of a vegetable compartment is not performed at the time of the refrigeration operation which the refrigerator of this embodiment was stable, the description about a vegetable compartment is abbreviate | omitted (In the following description of control, a vegetable compartment is also included in a refrigerator compartment).

In the stable cooling operation, a constant operation pattern (operation cycle) is repeated. Here, the description will be given from the state where the freezer operation is performed (step S101). The freezer operation is an operation for cooling the freezer in the state of " high blower blower temperature, refrigerating chamber cooling damper closing, freezing chamber cooling damper opening, and compressor on (high rotation) ".

When the freezer door 2a or the freezer door sensor that detects the opening / closing of the refrigerating compartment door 2b is detected in the state where the freezer operation is performed (opening or closing of the refrigerating compartment door 2a or the refrigerating compartment door 2b) (step S102), the flow advances to step S201 (step S201 will be described later). If there is no opening / closing of the refrigerating compartment door 2a or the refrigerating compartment door 2b, the refrigerating compartment upper limit temperature TR_2 in which the refrigerating compartment temperature continuously detected by the refrigerating compartment temperature sensor 33 is preset (TR_2 = 6 in the refrigerator of the present embodiment). It is determined whether or not it is higher than (° C) (step S103).

Refrigeration chamber temperature> When the refrigerator compartment upper limit temperature TR_2 is not (No) [Refrigerator temperature> Refrigeration chamber upper limit temperature TR_2 (Example) The control will be described later], the freezer compartment temperature detected by the freezer compartment temperature sensor 34, It is determined whether it is lower than the freezer compartment lower limit temperature TF_1 preset (TF_1 = -21 degreeC in the refrigerator of this embodiment) (step S104). If the freezer temperature <freezer lower limit temperature TF_1 is not set (NO), the process returns to step S101 again.

In step S104, when the freezer compartment temperature <freezer compartment lower limit temperature TF_1 is reached (Yes), the refrigerating compartment temperature and the predetermined reference temperature TR_a (TR_a = 5 ° C. in the refrigerator of the present embodiment) and TR_b (the present embodiment) are subsequently set. In the refrigerator of the form, TR_b = 4 degreeC) is compared, and the value of the reference temperature Tevp regarding the detection temperature of the cooler temperature sensor 35 is selected based on the comparison result. Specifically, if the refrigerator compartment temperature> TR_a, Tevp = Tevp_1 (Tevp_1 = 3 ° C. in the refrigerator of this embodiment), and if TR_a≥the refrigerator compartment temperature> TR_b, Tevp = Tevp_2 (Tevp_2 = -10 ° C. in the refrigerator of this embodiment). ) And Tevp = Tevp_3 (Tevp_3 = −18 ° C. in the refrigerator of the present embodiment) if TR_b ≧ freezer temperature (step S105).

Therefore, Tevp1 is selected when the outside temperature is high and the refrigerating chamber temperature is likely to rise, and when the outside temperature is low, and when the refrigerating chamber temperature is difficult to rise, Tevp3 is selected. Tevp2 is selected. Further, for example, a small gap occurs in the refrigerating compartment door 2a or the refrigerating compartment door 2b due to food debris or the like, which increases the heat load normally, but the refrigerating compartment door sensor has a small clearance, so the door is in a closed state. In some cases, an alarm indicating a door opening state does not sound. In this case, even if the outside air temperature is relatively low, the temperature of the refrigerating chamber may easily increase, and Tevp_2 or Tevp_1 may be selected as the value of Tevp.

Then, a frost cooling operation (first operation) is performed (step S106). Frost cooling operation | movement is operation (1st operation) performed in the state of "internal blower on, refrigerating chamber cooling damper opening, freezing chamber cooling damper closing, and compressor off". In the state where the frost cooling operation is performed, whether the refrigerator compartment temperature is lower than the refrigerator compartment lower limit temperature TR_1 (TR_1 = 1.5 ° C. in the refrigerator of the present embodiment) which is set in advance (step S107), and the reference that the cooler temperature is set in step S105. It is determined whether it is higher than the temperature Tevp (step S108), and when a refrigerator compartment temperature <refrigerator lower limit temperature TR_1 is not satisfied (No) and also does not satisfy | cooler temperature> reference temperature Tevp (No), a freezer compartment temperature is previously made. It is determined whether it is higher than the set compressor on temperature TF_2 (TF_2 = -19 degreeC in the refrigerator of this embodiment) (step S109), and if a freezer compartment temperature> compressor on temperature TF_2 is not satisfied (no), it resteps Return to S107.

In step S109, when it is determined that the freezer compartment temperature> compressor on temperature TF_2 (YES), the compressor is continuously turned on and the compressor rotates at a low speed (in the refrigerator of this embodiment, the compressor rotational speed is 1200min ^-1 ). The refrigerating chamber operation to be operated is performed (step S110). In other words, the refrigerating chamber operation (second operation) refers to the operation of cooling the refrigerating chamber in a state of "high blower blower temperature, refrigerating chamber cooling damper opening, freezing chamber cooling damper closing, and compressor on (low rotation)".

In the state where the refrigerator compartment operation (second operation) is performed, it is determined whether the freezer compartment temperature is higher than the preset freezer upper limit temperature TF_3 (TF_3 = -16 ° C in the refrigerator of the present embodiment) (step S111), and the freezer compartment temperature> If it is determined that the freezer upper limit temperature TF_3 is not satisfied (no) (freezer temperature> the control when the freezer upper limit temperature TF_3 is satisfied (Yes) is described later), the process proceeds to the determination of the refrigerator compartment temperature <refrigerator lower limit temperature TR_1 ( Step S112). If the refrigerator compartment temperature <refrigerator compartment lower limit temperature TR_1 is not satisfied (No), the process returns to step S111 again.

In step S112, when the refrigerator compartment temperature <refrigerator lower limit temperature TR_1 is satisfied (Yes), it becomes "refrigerating chamber cooling damper opening, refrigerating chamber cooling damper closing" (step S113), and a compressor continues high rotation (in the refrigerator of this embodiment), At this time, the compressor rotational speed is 1900 min ⁻¹ ) and the blower in the refrigerator is stopped (step S114). After a predetermined time (30 seconds in the refrigerator of the present embodiment) has elapsed (step S115), the internal blower is started to start a freezer compartment operation (step S116). Since the freezer compartment operation of step S116 is the state of the freezer compartment operation described in step S101, the above is the operation cycle during the stable cooling operation of the refrigerator of the present embodiment.

In addition, in the refrigerator, the heat load temporarily increases when the door is opened or closed, or when food having a relatively high temperature is stored. Hereinafter, the control in the case where the heat load of the refrigerator of the present embodiment temporarily increases will be described.

In the refrigerator of the present embodiment, whether or not the refrigerating compartment door 2a or the refrigerating compartment door 2b is opened or closed is determined in step S102, and there is a door opening and closing of the refrigerating compartment door 2a or the refrigerating compartment door 2b. In this case, the process proceeds to step S201. In step S201, the refrigerator compartment upper limit temperature TR_2 is replaced by TR_2 '(in the refrigerator of the present embodiment, TR_2 = 6 ° C becomes TR_2' = 8 ° C). The refrigerating chamber upper limit temperature TR_2 is returned to step S101 while overwriting TR_2 '. Returning to step S101, if the door is already closed (step S102 is determined to be "no"), then in step S103, determination of the refrigerator compartment temperature> refrigerator compartment upper limit temperature TR_2 is performed. Here, in step S201, since the refrigerator compartment upper limit temperature TR_2 is overwritten by TR_2 ', the refrigerator compartment upper limit temperature is high. Therefore, the refrigerator compartment temperature> refrigerator upper limit temperature TR_2 in step S103 becomes difficult to be satisfied rather than the case where there is no door opening and closing of the refrigerator compartment. When the refrigerator compartment temperature> refrigerator compartment upper limit temperature TR_2 in step S103 is satisfied (Yes), it is regarded that the refrigerator compartment is essential, and the refrigerator compartment cooling damper 20 is set to an open state, that is, the refrigerator freezing operation, that is, Both the refrigerating chamber and the freezing chamber are cooled by the operation of "air blower temperature on the inside, refrigerating chamber cooling damper opening, freezing chamber cooling damper opening, compressor on (high rotation)" (step S301). After the refrigeration freezing operation is started in step S301, the process proceeds to step S112. In addition, the refrigerating compartment upper limit temperature TR_2 is set to return to TR_2 (= 6 degreeC) which is an original value from TR_2 '(= 8 degreeC) again after the predetermined time (30 minutes in the refrigerator of this embodiment).

Further, in step S112, determination of the freezer compartment temperature> freezer compartment upper limit temperature TF_3 is performed during the refrigerator compartment operation. Freezer compartment temperature> When the freezer compartment upper limit temperature TF_3 is satisfied (Yes), it is regarded that the freezer compartment is in an essential state, the compressor is turned at high rotation, the freezer compartment damper 50 is opened, and the freezer freezer operation is performed. Both the refrigerating compartment and the freezing compartment are cooled by the operation of "internal blower on, refrigerating chamber cooling damper opening, freezing chamber cooling damper opening, compressor on (high rotation)" (step S501). After the refrigeration freezing operation is started in step S501, execution proceeds to step S112.

Further, if any one of step S107 (refrigeration chamber temperature <refrigeration chamber lower limit temperature TR_1) or step S108 (cooler temperature> Tevp (reference temperature set in step S105)) is satisfied (Yes), the blower in the refrigerator is stopped during the frost cooling operation. (Step S401), the process proceeds to step S109.

Fig. 7 shows the temperature change in the refrigerator when the refrigerator according to the present embodiment is installed in an environment having an outside air temperature of 30 ° C. and a relative humidity of 70%, and is in a state of stable cooling operation. It is a time chart which shows the control state of a cooling damper and a compressor. In addition, detailed measurement conditions are based on JIS C 9801: 2006.

As shown in FIG. 7, the freezer operation | movement performed in the state of "inner air blower temperature, refrigerating chamber cooling damper closing, freezer cooling damper opening, compressor on (high rotation)", and freezer temperature is freezer temperature lower limit temperature TF_1 in elapsed time ta. (Step S104 in FIG. 6), it is the frost cooling operation | movement performed in the state of "a blower blower temperature inside, a refrigerator compartment cooling damper closing, a freezer compartment cooling damper opening, and a compressor off" continuously (in FIG. 6). Step S106). In addition, since step S105 in FIG. 6 results in the refrigerating chamber temperature> TR_a (TR_a = 5 ° C), Tevp is Tevp = Tevp_1 (Tevp_1 = 3 ° C). Since the freezer compartment is not cooled during the frost cooling operation, the freezer compartment temperature rises and the compressor on temperature TF_2 has been reached at the elapsed time tb (step S109 in FIG. 6), so that the compressor continues at low rotation. It operates, and the refrigerator compartment operation | movement of "the internal blower on, the refrigerator compartment cooling damper opening, the freezer compartment cooling damper closing, and the compressor ON (low rotation)" is performed (step S110 of FIG. 6). From the elapsed time tb to the refrigerating chamber operation in which the compressor operates, while the compressor was frost cooling until the elapsed time tb, the cooling of the refrigerating chamber is accelerated, and the refrigerating chamber lower limit temperature TR_1 is reached at the elapsed time tc. (Step S112 in FIG. 6). Therefore, the operation shifts to the freezer compartment operation (third operation "internal blower on, refrigerating chamber cooling damper closing, freezing chamber cooling damper opening, compressor on (high rotation)"), but at the start of the freezer operation, the predetermined time Δt (Δt = 30). During the second), the internal blower is stopped (steps S113 to S115 in FIG. 6), and after a predetermined time Δt elapses, the internal blower is started to start cooling (step S116 in FIG. 6).

As mentioned above, although the structure of the refrigerator of this embodiment and the control method were demonstrated, the effect which the refrigerator of this embodiment exerts is demonstrated next.

The refrigerator of this embodiment is controlled so that a refrigerator compartment cooling operation may be performed following a frost cooling operation at the time of a stable cooling operation. Thereby, energy saving can be made high enough. The reason for this is described below.

When the frost cooling operation is performed, as shown in FIG. 7, the cooler temperature exchanges heat with the return cold having a relatively high temperature from the refrigerating chamber and the temperature rises. At this time, part of the surface of the frost is melted, and the water penetrates into the frost layer. The water that has penetrated is partially frozen because the inside of the frost layer is low temperature. Since frost becomes 0 degreeC constant temperature at the time of melting (phase change), in the state in which the majority of frost is phase-changing, a cooler temperature will be almost 0 degreeC. However, as shown in FIG. 7, in general, even when frost cooling is performed at the time of stable cooling operation, it is difficult to raise the cooler temperature to near 0 ° C where most of the frost is melted. In addition, in order to complete defrost in a frost cooling operation, it is necessary to perform frost cooling operation until the point where frost completes phase change and becomes 0 degreeC or more, but when frost cooling operation is continued by then, the rise of a freezer temperature is remarkable. Problems such as melting frozen foods will occur.

Therefore, in general, even when the frost cooling operation is performed, defrosting of the frost (melting frost and draining it out through the drain pipe 27) is almost impossible. On the other hand, the frost cooling operation can cool the refrigerating chamber by using the power of only an internal blower (generally very small compared to the compressor power), using the sensible heat of frost and the latent heat of partial melting as a cooling heat source. It is driving with high economy. However, considering that the molten frost is hardly discharged out of the frost, the frost heated by the frost cooling operation or the melted molten water becomes the heat load when the next cooling operation is performed. In addition, as a result of melting the frost surface and penetrating the inside of the frost layer, it changes from the porous frost containing a lot of air to frost close to ice with less air. Since the porous frost has a very low thermal conductivity and a high frost height (small density), the ratio of blocking the flow path of the cooler is also large, and the ventilation resistance of the cooler is large. On the other hand, since the frost after the frost cooling operation becomes frost close to ice with less air portion, the thermal conductivity is increased and the frost height is lowered, so the ventilation resistance is lowered. As described above, in the next cooling operation of the frost cooling operation, the heat load increases due to frost that has risen in temperature by the frost cooling operation and the melted melted frost, and the frost is close to ice with less air portion, so that the heat transfer performance of the cooler is good. Can be said to be driving. The evaporation temperature is determined to be balanced with the endothermic amount (determined from the latent heat of evaporation and the refrigerant circulation amount) of the refrigerant flowing in the cooler and the amount of heat transfer that deprives the coolant from the cooler (transmitting heat to the cooler). Afterwards, it can be said that it is a state which is easy to raise evaporation temperature because the heat transfer performance is a good state (in general, the higher the evaporation temperature, the higher the coefficient of performance of a refrigeration cycle). On the other hand, as the cooling operation after the frost cooling operation, a freezer compartment operation, a refrigerating compartment operation, and a refrigeration freezing operation can be considered. However, if there is blowing air to the freezer compartment, the temperature of the return cold air flowing into the cooler 7 is lowered, so that the evaporation temperature is increased. it's difficult. Therefore, as the cooling operation after the frost cooling operation is in a state where the evaporation temperature is likely to be increased, it is preferable to use the refrigerating chamber operation having a high return cold air temperature in order to improve energy saving. In addition, in the next cooling operation of the frost cooling operation, as described above, the heat load increases due to the frost that has risen by the frost cooling operation or the melted melted water, but this is the frost cooling operation, which increases the heat load due to cooling the refrigerating chamber. Since the heat load is cooled by a refrigerating chamber operation having a high evaporation temperature (high freezing cycle performance coefficient), the energy saving efficiency is higher than that of a freezer operation having a low evaporation temperature or cooling by a refrigerating refrigeration operation.

In the refrigerator of the present embodiment, control is performed to shift from the frost cooling operation to the refrigerating chamber operation based on the freezer compartment temperature (step S110 in FIG. 6). Thereby, by continuing the frost cooling operation, it is possible to prevent the rise of the freezer temperature from becoming remarkable, to perform the cooling operation with high reliability, and to perform the refrigerating freezer operation, which is performed when the freezer temperature rise becomes significant. Since the evaporation temperature cannot be made high, the coefficient of performance of the refrigeration cycle is low, which is undesirable in view of energy saving.

In the refrigerator of the present embodiment, the refrigerator compartment lower limit temperature TR_1 is set in advance in order to determine the end of the cooling of the refrigerator compartment. When the refrigerator compartment temperature reaches the refrigerator compartment lower limit temperature TR_1 during the frost cooling operation, the air blower 9 is stopped. (Step S107 in FIG. 6). As a result, the refrigerating compartment is excessively cooled to prevent a problem such as freezing of the food stored in the refrigerating compartment.

In the refrigerator of the present embodiment, the internal blower 9 is stopped during the frost cooling operation based on the cooler temperature (step S108 in FIG. 6). Thereby, ventilation is continued even after the refrigerating compartment is cooled or the frost is lost and there is no cooling capacity, and there is no loss of fan power.

The refrigerator of the present embodiment switches the cooler temperature in order to determine the stop of the blower during the frost cooling operation based on the refrigerating chamber temperature at the start of the frost cooling operation (step S105 in FIG. 6). Thereby, frost cooling operation | movement according to the heat load of a refrigerator compartment can be performed.

The refrigerator of this embodiment is controlled so that freezer operation may be performed following a refrigerator operation. As shown in the time chart of FIG. 7, the cooler temperature at the time of frost cooling operation rises to a temperature significantly higher than the freezer upper limit temperature TF_3, and the cooler temperature (evaporation temperature higher than the freezer upper limit temperature TF_3 in the subsequent refrigerating chamber operation). Cooling is performed, but as the cooling proceeds, the return cold air temperature from the refrigerating chamber is lowered, but the cooler temperature is lowered as the frost grows in the cooler and the heat transfer performance is reduced. At the time when the cooler temperature is lowered, the cooler temperature can be easily transferred to a temperature suitable for the freezer operation in order to carry out a freezer operation in which a low cooler temperature is continuously required. Waste, such as heating the freezer compartment, is less likely to occur, resulting in higher energy savings.

As shown in the time chart of FIG. 7, the refrigerator of the present embodiment is controlled so that the cooler temperature during the refrigerating chamber operation is higher than the cooler temperature during the freezing chamber operation. Specifically, the compressor rotation speed during the refrigerating chamber operation is controlled to be low, and the compressor rotation speed during the freezer compartment operation to be high. Thereby, since the grade coefficient of the refrigerating cycle during refrigerator compartment operation can be made high, it becomes a refrigerator with high energy saving property. The reason for this is described below.

The evaporation temperature is determined so that the endothermic amount (determined from the latent heat of evaporation and the refrigerant circulation amount) of the refrigerant flowing in the cooler is balanced with the amount of heat transfer that deprives the cool heat from the cooler (transmitting heat to the cooler). Therefore, in order to increase the evaporation temperature, it is effective to take more cooling heat from the cooler (increase the amount of heat transfer), which is effective to reduce the refrigerant circulation amount, that is, lower the compressor rotation speed in a range where the required cooling capacity is obtained. . As a result, the amount of heat transfer that deprives the cool heat from the cooler (transmitting heat to the cooler) is increased, so that the evaporation temperature is increased and balanced, resulting in a high coefficient of performance of the refrigeration cycle, resulting in a refrigerator with high energy savings. . In addition, the embodiment other than lowering the compressor rotation speed during the refrigerating chamber operation, which increases the air flow rate by increasing the rotational speed of the blower in the refrigerator compartment during operation, thereby depriving the cooling heat from the cooler (transmitting heat to the cooler). Even if the amount of heat transfer is increased, the effect of raising the evaporation temperature can be similarly obtained. However, increasing the rotation speed of the blower involves increasing the noise.

In the refrigerator of the present embodiment, when the opening and closing of the refrigerating compartment door is detected during the freezer operation, control is performed such that the set value of the refrigerating compartment upper limit temperature TR_2 shifts to a predetermined temperature (step S102 in FIG. 6, step S201). . As a result, when the refrigerating compartment door is opened or closed during the freezer operation, the situation that the refrigerating and refrigerating operation (low evaporation temperature is low and low energy saving) is difficult to occur since the refrigerating compartment temperature has reached the refrigerating compartment upper limit temperature TR_2, It becomes a refrigerator with high energy saving.

In the refrigerator according to the present embodiment, the control is performed to maintain a predetermined time in a state in which the refrigerator and the freezer are not blown in the compressor operating state when the refrigerator transitions from the freezer operation to the freezer operation (step in FIG. 6). S113 to S115). Thereby, the waste of sending a high temperature cold air to a freezer compartment to a freezer compartment, and heating a freezer compartment hardly generate | occur | produce, and energy saving property improves.

1: refrigerator
2: refrigeration room (refrigeration temperature room)
3: ice making room (frozen temperature room)
4: upper freezer (freezing temperature room)
5: Lower freezer compartment (freezing temperature compartment)
6: vegetable room (cold temperature room)
7: cooler
8: cooler storage room
9: blower (blower)
10: insulation box
11: cold room ventilation duct
12: upper freezer blowing duct
13: cold air duct
15: refrigerator compartment duct
16: cold room-vegetable room communication duct
17: freezer return port
18: vegetable room return duct
18a: vegetable chamber return outlet
19: machine room
20: cold room cooling damper
21: evaporating dish
22: defrost heater
23: gutter
24: compressor
31: control board
33: fridge temperature sensor
33a: Vegetable Room Temperature Sensor
34: freezer temperature sensor
35: cooler temperature sensor
50: Freezer Cooling Damper
53: top cover
54: partition plate
60: freezer

Claims (9)

Refrigeration temperature room and refrigeration temperature room formed in the refrigerator body,
A compressor installed in a machine room installed behind the refrigeration temperature chamber;
A cooler installed in a cooler chamber installed at a rear of the freezing temperature chamber;
A blower installed above the cooler in the cooler chamber to blow cold air into the refrigerating temperature chamber and the freezing temperature chamber;
A refrigerator compartment damper for controlling an amount of supply of cold air to the refrigerator compartment;
A freezer compartment damper for controlling a supply amount of cold air to the freezing temperature chamber;
Performing a first operation of driving the blower in a state in which the freezer compartment damper is closed and the refrigerating compartment damper is opened when the compressor is stopped,
A second operation of driving the blower by driving the compressor after closing the freezer compartment damper and opening the refrigerating compartment damper after the first operation,
And a freezer compartment temperature sensor for detecting the temperature of the freezer compartment, and shifting from the first operation to the second operation based on the detection temperature of the freezer compartment temperature sensor. delete The refrigerator compartment temperature sensor which detects the temperature of the said refrigerating compartment is provided, The said blower is stopped when the detection temperature of the said refrigerating compartment temperature sensor reaches the set temperature during the said 1st operation, It is characterized by the above-mentioned. Refrigerator. The refrigerator of Claim 1 which is equipped with the cooler temperature sensor which detects the temperature of the said cooler, and stops the said blower based on the detection temperature of the said cooler temperature sensor during the said 1st operation. The setting temperature of the said cooler for stopping the said blower during a said 1st operation is switched based on the detection temperature of the said refrigerator compartment temperature sensor at the time of starting the said 1st operation, It is characterized by the above-mentioned. Refrigerator. The refrigerator according to claim 3, wherein after the second operation, a third operation of driving the blower is performed by closing the refrigerator compartment damper and opening the freezer compartment damper while the compressor is driven. The refrigerator according to claim 6, wherein the cooler has a higher temperature during the second operation than during the third operation. The refrigerator according to claim 6, further comprising means for detecting the opening and closing of the door of the refrigerating compartment, and when the opening and closing of the door of the refrigerating compartment is detected during the third operation, the set temperature of the refrigerating compartment is increased. Refrigerator. The air conditioner of claim 6, wherein the blower is stopped while the compressor is driven for a predetermined time between the second operation and the third operation, and the air is not blown to the refrigerating temperature chamber and the refrigerating temperature chamber. To do, refrigerator.

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