CN103256784B - refrigerator - Google Patents

Abstract

The present invention provides a refrigerator capable of performing good cooling without causing an abnormal increase in the temperature of the freezing compartment or a local decrease in the temperature of the refrigerating compartment. The refrigerator is provided with a freezing compartment as a freezing temperature zone compartment, a refrigerating compartment as a refrigerating temperature zone compartment, a cooler compartment for accommodating a cooler, a cold air duct for the freezing compartment from the cooler compartment, passing through the freezing compartment and returning to the cooler compartment again. The cooler room passes through the refrigerating room and returns to the refrigerating room cold air duct of the cooler room again, the first blower blows air to the freezing room cold air duct, and the second blower blows air to the refrigerating room cold air duct. The refrigerator is characterized by , set or adjust the rotation speed combination of the first blower and the second blower, so that the blowing area pressure of the first blower (P1), the blowing area pressure of the second blower (P2), the upstream pressure of the cooler in the cooler chamber (P3 ), and the downstream pressure (P0) of the cooler in the cooler chamber are P1>P3>P0 and P2>P3>P0.

Description

refrigerator

technical field

The invention relates to a refrigerator.

Background technique

As background technology in this technical field, there is Japanese Patent No. 3494874 (Patent Document 1).

Patent Document 1 discloses a refrigerator that includes a cooling system consisting of a compressor, a radiator, a capillary tube, and a cooler, a refrigerator compartment, a freezer compartment, a cooler air channel covering the cooler, The air cooled in the flow channel is sent to the refrigerating room air supply channel of the refrigerating room, the air cooled in the cooler air channel is sent to the freezer air supply channel of the freezing room, and the air is sent from the refrigerating room to the cooler air channel Refrigerator return passage for returning air, freezer return passage for returning air from the freezer to the cooler air passage, a fan for the refrigerator in the air supply passage for the refrigerator, and a freezer compartment in the air supply passage for the freezer With the fan, the refrigerator compartment and the freezer compartment are cooled by simultaneously driving the refrigerator compartment fan and the freezer compartment fan (FIG. 7, FIG. 8, FIG. 11, etc. of Patent Document 1).

prior art literature

Patent Document 1: Japanese Patent No. 3494874

In the refrigerator described in Patent Document 1, there is no description about the backflow phenomenon. The so-called backflow phenomenon refers to the flow from the freezer compartment or the freezer compartment to the other during the cooling operation in which the refrigerator compartment fan and the freezer compartment fan are simultaneously driven. The cold air flows into the storage room, that is, the cold air flows from the refrigerating room return channel or the freezing room return channel to the refrigerating room or the freezing room, so the refrigerator does not fully consider the occurrence of reverse flow. In this case, during the cooling operation, the temperature of the freezer compartment rises abnormally or the temperature of the refrigerator compartment drops too much, and the inside of the refrigerator may not be properly cooled.

Contents of the invention

The present invention was made in view of the above problems, and an object of the present invention is to provide a refrigerator capable of cooling well without abnormal temperature rise or local excessive drop in the storage room during cooling operation in which the storage room is cooled by a fan.

In order to solve the above-mentioned problems, for example, the configuration described in the claims is employed. A refrigerator as an example thereof includes a freezer compartment as a freezing temperature zone compartment, a refrigerating compartment as a refrigeration temperature zone compartment, a cooler compartment for accommodating a cooler, and returning from the cooler compartment to the cooler compartment through the freezer compartment. The cold air duct of the freezer compartment, the cold air duct of the refrigerator compartment from the cooler compartment through the refrigerator compartment and back to the cooler compartment, the first air blower for supplying air to the cold air duct of the freezer compartment, and the first air blower for supplying air to all The second blower for blowing air from the cold air duct of the refrigerating room is characterized in that the rotation speed combination of the first blower and the second blower is set or adjusted so that the blowing area pressure P1 of the first blower, The relationship between the blowing area pressure P2 of the second air blower, the upstream pressure P3 of the cooler in the cooler chamber, and the downstream pressure P0 of the cooler in the cooler chamber is P1>P3>P0 and P2>P3>P0.

The effects of the present invention are as follows.

According to the present invention, it is possible to provide a refrigerator capable of good cooling without an abnormal increase in the temperature of the storage room or a partial excessive drop in the temperature of the storage room during the cooling operation in which the storage room is cooled by a blower.

Description of drawings

Fig. 1 is a front view showing a door-open state of a refrigerator according to a first embodiment of the present invention.

Fig. 2 is a cross-sectional view along line A-A of Fig. 1 .

Fig. 3 is an enlarged view showing the rear structure of the freezer compartment of the refrigerator according to the first embodiment of the present invention.

Fig. 4 is a front view showing an air duct structure of the refrigerator according to the first embodiment of the present invention.

Fig. 5 is a schematic diagram of a cooling air duct of the refrigerator according to the first embodiment of the present invention.

Fig. 6 is a flowchart showing basic control of the refrigerator according to the first embodiment of the present invention.

Fig. 7 is a flowchart showing basic control of the refrigerator according to the first embodiment of the present invention.

Fig. 8 is a table for discriminating the frosting state of the refrigerator according to the first embodiment of the present invention.

Fig. 9a is a schematic diagram showing changes in the flow pattern due to the amount of frost formation.

Fig. 9b is a schematic diagram showing changes in the flow pattern due to the amount of frost formation.

Fig. 9c is a schematic diagram showing changes in the flow pattern due to the amount of frost formation.

Fig. 10 is a table showing the setting values of the fans for the freezer compartment and the fans for the refrigerator compartment, and the presence or absence of backflow.

Fig. 11a is a graph showing changes in the air volume of the freezing compartment and the air volume of the refrigerating compartment depending on the amount of frosting.

Fig. 11b is a graph showing changes in the air volume of the freezing compartment and the air volume of the refrigerating compartment depending on the amount of frosting.

Fig. 12 is a schematic diagram of the cooling air duct of the refrigerator according to the second embodiment of the present invention.

In the picture:

1—refrigerator, 2—freezer, 3—refrigerator, 4—air outlet of freezer, 5—air return of freezer, 6—air outlet of refrigerator, 7—return of air of refrigerator, 8—insulation box Body, 9—insulation partition, 10—freezer door shelf, 11—refrigerator door shelf, 12—freezer back partition, 13—refrigerator rear partition, 14—freezer fan (freezer room air supply unit, first blower), 15—refrigerating room fan (refrigerating room air supply unit, second blower), 16—cooler, 17—cooler room, 18—cooler room partition, 20—vegetables Storage space, 21—freezer air duct, 22—refrigerator air duct, 22a—first refrigerator air duct, 22b—second refrigerator air duct, 22c—third refrigerator air duct, 23—refrigerator room Return air duct, 25—compressor, 26—division (rib), 27—refrigerator door, 28—flow trough, 29—defrosting heater, 35—mechanical room, 51—freezer temperature sensor, 52—refrigeration Chamber temperature sensor, 53—cooler temperature sensor, 60—pressure adjustment flow channel.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Example 1

First, a first embodiment of the refrigerator according to the present invention will be described with reference to FIGS. 1 to 11 .

First, the configuration of the refrigerator according to the present embodiment will be described with reference to FIGS. 1 to 5 . 1 is a front view showing the door of the refrigerator of the present embodiment in an open state, FIG. 2 is a cross-sectional view along A-A of FIG. 1 (door closed state), and FIG. FIG. 4 is a front view showing the air duct structure of the refrigerator according to the present embodiment, and FIG. 5 is a schematic view of the cooling air duct of the refrigerator according to the present embodiment.

As shown in FIG. 1 , the refrigerator 1 according to the present embodiment includes a freezer compartment 2 on the upper floor, a refrigerator compartment 3 on the lower floor, and a drawer-type vegetable storage space 20 below the refrigerator compartment 3 . The outside of the refrigerator 1 is separated from the inside by an insulating box 8 filled with rigid urethane foam, and the freezer compartment 2 and the refrigerator compartment 3 are separated by an insulating partition 9 . Freezer compartment 2 and refrigerator compartment 3 are opened and closed by front freezer compartment door 2a and refrigerator compartment door 3a, respectively.

The freezer door shelf 10 and the refrigerator door shelf 11 are bag-shaped storage parts with the top open, especially the refrigerator door shelf 11 is suitable for storing plastic bottles and cans filled with cool drink water and mineral water. and other beverage containers, the user can access the beverage container easily.

On the back side of the freezer compartment 2 (refrigerator 1 is the back side of the freezer compartment 2 when viewed from the front), a freezer compartment back partition 12 is provided. Room air-conditioning returns to port 5. In addition, freezer compartment cold air outlets 4 are provided in plural in the vertical direction, and cool air is blown out corresponding to a plurality of storage spaces partitioned by shelf 2b on which foods are placed.

On the back side of the refrigerator compartment 3 (refrigerator 1 is the back side of the refrigerator compartment 3 when viewed from the front), a refrigerator compartment back partition member 13 is arranged. The refrigerator compartment rear partition member 13 has a refrigerator compartment cold air outlet 6 . A plurality of cool air outlets 6 in the refrigerator compartment are provided in the vertical direction, and cool air is sent to each storage space partitioned by the shelf 3b on which food is placed.

As shown in FIG. 2 , refrigerator 1 includes cooler chamber 17 at the back of freezer compartment 2 , and fin tube type cooler 16 as a cooling unit is accommodated in cooler chamber 17 . The cooler 16, the compressor 25 installed in the machine room 35 at the lower back of the refrigerator 1, the unillustrated radiator as a heat dissipation unit, and the unillustrated capillary tube as a decompression unit are connected by refrigerant pipes to form a refrigeration cycle. . The front of cooler compartment 17 is partitioned by cooler compartment partition member 18 , and freezer compartment air supply duct 21 is formed between cooler compartment partition member 18 and freezer compartment rear partition member 12 . A defrosting heater 29 is disposed below the cooler 16 so as to melt frost formed on the cooler 16 . The defrosting water generated by the melting of frost drips into the gutter 28 as a water storage part arranged below the defrosting heater 29, reaches the machine room 35 through a drain pipe not shown in the figure, and flows down to the machine room 35. The equipped evaporator (not shown) evaporates using the heat released by the compressor 25 or the like.

FIG. 3 is an enlarged view showing a state where freezer compartment back partition member 12 (see FIG. 2 ) on the back side of freezer compartment 2 is removed. A cooler compartment partition member 18 is disposed on the back of the freezer compartment rear partition member 12 (see FIG. 2 ). On the upper portion of the cooler compartment partition member 18, a freezer fan 14 (first blower) as a freezer ventilation unit and a refrigerator fan 15 as a refrigerator ventilation unit are arranged side by side in the width direction of the refrigerator 1. (second blower). Cooled air after exchanging heat with cooler 16 provided in cooler compartment 17 at the back of cooler compartment partition member 18 is sent to freezer compartment 2 and refrigerator compartment 3 by freezer compartment fan 14 and refrigerator compartment fan 15 . On the side of the fan 15 for a refrigerator, a refrigerator air duct 22 is formed. Furthermore, a rib-shaped partition 26 is provided on the front side of cooler compartment partition member 18 (on the blowing side of refrigerating compartment fan 15 ), and cold air blown from refrigerating compartment fan 15 is guided to refrigerating compartment air duct 22 . In addition, the cooler compartment partition member 18 is provided with an opening 5a for allowing return cold air flowing in from the freezer compartment cool air return port 5 (see FIG. 1 ) provided on the freezer compartment rear partition member 12 into the cooler compartment 17. Inside.

As shown in FIG. 4 , the refrigerating room air duct 22 extends downward on the left side of the back side viewed from the front of the freezing room 2 , and branches into a second section extending downward on the back side of the refrigerating room 3 at the back side of the heat insulating partition 9 . A refrigerating room air duct 22a (illustrated by dotted lines); a second refrigerating room air duct 22b (illustrated by dotted lines) extending downward on the right side of the back; Refrigerating room air duct 22c (refer to FIG. 2 ). On the first refrigerating room air channel 22a, the second refrigerating room air channel 22b, and the third refrigerating room air channel 22c, the cold air blowing outlet 6 of the refrigerating room is respectively formed, and the shelves 3b, the refrigerating room door shelf 11 Each storage space demarcated by the equal area is supplied with cold air correspondingly.

In addition, in the back center of the refrigerator compartment 3, a refrigerator compartment return air duct 23 (illustrated by a dotted line) is formed, so that the cold air returning to the refrigerator compartment from the refrigerator compartment cold air return port 7 formed on the back of the vegetable storage space 20 at the bottom of the refrigerator compartment 3 flows in. The cold air flows into the cooler chamber 17 . In addition, in refrigerator compartment air duct 22 , refrigerator compartment damper 27 , which is a ventilation resistance adjustment means for controlling the amount of cool air to refrigerator compartment 3 , is disposed.

Here, the basic flow of cold air in the refrigerator 1 will be described with reference to FIG. 5 . 5 shows a state in which cool air circulates in the freezer compartment 2 and the refrigerator compartment 3 with the refrigerator compartment damper 27 open and the freezer compartment fan 14 and the refrigerator compartment fan 15 both driven. As shown by the arrow in FIG. 5 , the cold air cooled by the cooler 16 is pressurized by the freezer fan 14 and flows into the freezer 2 through the freezer air duct 21 from the freezer cool air outlet 4 . The cold air after cooling the freezer compartment 2 returns to the cooler compartment 17 through the freezer compartment cold air return port 5, and is cooled by the cooler 16 again.

On the other hand, part of the cold air cooled by cooler 16 is pressurized by refrigerator fan 15 , and flows into refrigerator compartment 3 from refrigerator compartment cool air outlet 6 through refrigerator compartment air duct 22 . The cold air after cooling the refrigerating chamber 3 flows from the refrigerating chamber cold air returning port 7 in the refrigerating chamber return air duct 23 to the cooler chamber 17 and is cooled again by the cooler 16 .

In addition, in the refrigerator of the present embodiment, the side wind from the refrigerator compartment reaches the cooler compartment 17 from the refrigerator compartment air supply duct 22 through the refrigerator compartment cool air outlet 6, the refrigerator compartment cool air return port 7, and the refrigerator compartment cool air return duct 23. The ventilation resistance of the passage is greater than the ventilation resistance of the freezing chamber side air passage from the freezing chamber air supply passage 21 to the freezing chamber side air passage of the cooler chamber 17 via the freezing chamber cold air outlet 4 and the freezing chamber cold air returning port 5 . Specifically, the total opening area of the cold air outlet 6 in the refrigerator compartment is 5000 mm ² , and the total opening area of the cold air outlet 4 in the freezer compartment is 15000 mm ² , so that the ventilation resistance of the side air duct of the refrigerator compartment is greater than that of the side air duct of the freezer compartment. ventilation resistance.

In addition, the refrigerator 1 includes a freezer compartment temperature sensor 51 (see FIG. 2 ), a refrigerator compartment temperature sensor 52 (see FIG. 2 ), and a cooler temperature sensor for detecting the temperatures of the freezer compartment 2, the refrigerator compartment 3, the cooler 16, and the outside air. 53 (refer to FIG. 2 ), an outside air temperature sensor not shown. Further, refrigerator 1 includes door sensors (not shown) that detect the open and closed states of doors 2a and 3a, respectively.

Refrigerator 1 is equipped with CPU, ROM or RAM etc. memory, interface circuit etc. not shown control substrate, control substrate and above-mentioned freezer compartment temperature sensor 51, refrigerating compartment temperature sensor 52, cooler temperature sensor 53, respectively detect Door sensors for opening and closing states of the freezer compartment door 2a and refrigerating compartment door 2b, a temperature setting device not shown, a rapid cooling mode setting device for cooling the storage compartment to a predetermined temperature in a short time, and setting the freezer compartment 2 at It is connected to a rapid freezing mode setter that cools down to a predetermined temperature in a short time, etc. The ON/OFF or rotation speed control of the compressor 25, the control of the unillustrated driver for driving the refrigerating compartment damper 27, and the ON/OFF of the freezing compartment fan 14 and the refrigerating compartment fan 15 are performed using the program preinstalled in the ROM. OFF or speed control and other controls.

Next, control of the refrigerator according to this embodiment will be described with reference to FIGS. 6 to 8 . 6 and 7 are control flowcharts showing basic control of the refrigerator according to the present embodiment, and FIG. 8 is a table of values for determining the frosting state of the refrigerator 1 according to the present embodiment. Furthermore, control is performed by a control device, for example, a CPU of a control board executing a program stored in the ROM.

As shown in FIG. 6 , the refrigerator 1 starts to operate (starts) when the power is turned on. After the power is turned on, the so-called pull down operation is performed to quickly cool the uncooled box to the vicinity of the set temperature. However, the control during the pull down operation is omitted here. Control from stop state.

In the state where the compressor of the refrigerator 1 is stopped, it is determined whether or not the condition for starting the compressor is satisfied (step S101 ). In the refrigerator 1, the freezer temperature detected by the freezer temperature sensor 51 (hereinafter referred to as "freezer temperature") is above TF2 (TF2 = -17°C) (the freezer 2 is above the upper limit set temperature), or the refrigerator When the temperature of the refrigerating compartment detected by the compartment temperature sensor 52 (hereinafter referred to as "refrigerating compartment temperature") is higher than TR2 (TR2 = 6°C) (the refrigerating compartment 3 is at or above the upper limit setting temperature), the condition for starting the compressor is established (step Yes in S101 ), and then, the rotational speed setting values of the fan 14 for the freezer compartment and the fan 15 for the refrigerator compartment are each set to 1 (step S102 ).

In addition, in the refrigerator 1, the rotational speeds of the freezer compartment fan 14 and the refrigerator compartment fan 15 are switchable in five stages of set values 1 to 5, with set value 1 being the lowest speed and set value 5 being the highest speed. The relationship between the setting value of the fan 14 for the freezer and the specific rotational speed is as follows, setting value 1: about 1200min ^-1 , setting 2: about 1600min ^-1 , setting 3: about 2000min ^-1 , setting 4 : about 2400 min ^-1 , setting 5: about 2800 min ^-1 . In addition, the relationship ^between the set ^value and the specific rotational ^speed of the fan 15 for the refrigerating room is as follows. Setting 4: about 2300 min ^-1 , setting 5: about 2700 min ^-1 .

Then, the refrigeration and freezer cooling operations are started, that is, the refrigerator door 27 is opened, the compressor 25 is driven, and the freezer fan 14 and the refrigerator fan 15 rotate at a speed based on the set value set in step S101. is driven to cool both the freezer compartment 2 and the refrigerator compartment 3 (step S103 ).

During the refrigerating and freezing compartment cooling operation, first, it is determined whether or not the thermal load of the freezing compartment 2 is large (step S104 ). Step S104 is established (Yes) when the freezer compartment temperature is equal to or higher than TF3 (TF3=−14° C.) (the freezer compartment 2 is equal to or greater than the thermal load setting upper limit temperature). When step S104 is not established, it is next determined whether or not the thermal load of the refrigerator compartment is large (step S105 ). Step S105 is established (Yes) when the refrigerator compartment temperature is equal to or higher than TR3 (TR3=8° C.) (refrigerator compartment 3 is equal to or greater than the heat load setting upper limit temperature).

If step S105 is not established, it is next determined whether or not to implement frosting amount determination operation (described in detail below) (step S106 ). When step S106 is not satisfied (No), next, it is judged whether the refrigerator compartment damper closing condition is satisfied (step S107). Step S107 is established (Yes) when the refrigerator compartment temperature is equal to or higher than TR1 (TR1=2° C.) (refrigerator compartment 3 is equal to or less than the lower limit set temperature). When step S107 is not established, it returns to the determination of step S104 again (the cases of step S104 , S105 , and S106 are established will be described later).

When step S107 is established, then implement the freezer cooling operation, that is, the refrigerator door 27 is closed, the refrigerator fan 15 is stopped, and the freezer fan 14 and compressor 25 are driven to cool the freezer 2 (step S108) . During execution of the freezing compartment cooling operation, it is determined whether or not the condition for closing the refrigerating compartment damper is satisfied (step S109 ). Step S109 is established (Yes) when the refrigerator compartment temperature is equal to or higher than TR2 (TR2=6°C). When step S109 is established, it transfers to step S103, the refrigerating compartment damper 27 is opened, and a refrigerating and freezing compartment cooling operation is started. When step S109 is not satisfied (No), it is next determined whether or not the compressor stop condition is satisfied (step S110 ). Step S110 is established (Yes) when the freezer compartment temperature is TF1 (TF2=-21° C.) or lower (the freezer compartment 2 is lower than the lower limit set temperature), and returns to step S109 again when step S110 is not established. When step S110 is established, the compressor 25 and the freezer compartment fan 14 are stopped (step S111 ), and the process returns to the determination of the compressor activation condition in step S101 .

Next, a case where it is determined in step S104 that the thermal load of the freezing compartment is large will be described. Step S104 is established, for example, when the freezer compartment door 2 a is opened for a long time, or when food at or above normal temperature is stored in the freezer compartment 2 . When step S104 is established, it transfers to step S201 shown in FIG. 7, and it determines whether the fan setting value for freezing compartments has reached the maximum. For example, when the setting value of the fan for freezing compartment is set to 1, step S201 is not established (No), and it transfers to step S202, and 1 is added to the setting value of the fan for freezing compartment. Thereby, the setting value of the fan for freezer compartments becomes 2. Next, it is determined whether or not the amount of frost deposited on cooler 16 is large (step S203 ).

Here, a method for determining the frosting amount of the refrigerator 1 will be described with reference to FIG. 8 . The refrigerator 1 determines the amount of frosting by using the outside air temperature, the accumulated drive time of the compressor since the previous defrosting operation, and the number of door openings and closings since the previous defrosting operation. Specifically, as shown in FIG. 8, points are assigned to the outside air temperature, the cumulative driving time of the compressor, and the number of times of door opening and closing after defrosting operation, and the sum of each point is calculated. If the sum of the points is 4 or less, it is judged as " The amount of frosting is small", and if it is 5 or more, it is judged as "the amount of frosting is large". Therefore, for example, when the outside air temperature Tout=30°C, the compressor driving time t=5h, and the number of times Nd of door opening and closing after defrosting operation is 10 times, the number of points is 3+0+1=4, and the judgment is " The amount of frosting is small".

When step S203 is not established, that is, when it is determined in step S203 that "the amount of frosting is small", the difference between the set value of the fan 14 for the freezer and the set value of the fan 15 for the refrigerating room is determined next. Whether it is 3 or more (step S204). When step S204 is established (Yes), 1 is added to the set value of the fan 15 for refrigerator compartments (step S205). For example, when the set value of the fan 14 for the freezer compartment is 2 and the set value of the fan 15 for the refrigerating compartment is 1, step S204 is not established (the case of step S204 is established as described below), and then it is determined whether cold air is generated. A so-called backflow phenomenon of flowing from the refrigerator compartment 3 to the freezer compartment 2 or from the freezer compartment 2 to the refrigerator compartment 3 (step S206 ). Refrigerator 1 determines the presence or absence of backflow based on a change in the temperature of the freezer compartment or the temperature of the refrigerator compartment since the set value of the fan 14 for the freezer compartment or the fan 15 for the refrigerator compartment was changed. Specifically, it is determined that the cold air in the refrigerator compartment 3 is freezing when the temperature in the freezer compartment has risen by 0.5° C. or more two minutes after the set value of the fan 14 for the freezer compartment or the fan 15 for the refrigerator compartment has been changed. Compartment 2 flows backward, and when the temperature of the refrigerator compartment drops by 0.5° C. or more two minutes later, it is determined that the cold air in freezer compartment 2 is flowing backward into refrigerator compartment 3 (details of the reverse flow will be described later).

When it is determined in step S206 that "there is backflow" (step S206 is Yes), the set value of the fan 15 for the refrigerator compartment is raised to the set value of the fan 14 for the freezer compartment, and the fan 14 for the freezer compartment and the refrigerator compartment The fan 15 becomes the same set value (step S302). On the other hand, when step S206 is not established, it transfers to the determination of step S105 in FIG. 6 , and when steps S105 to S107 are not established, it returns to step S104 again to determine the thermal load of the freezer compartment. When the heat load of the freezer compartment is large, the setting value of the fan 14 for the freezer compartment is raised by step S202 being established multiple times. Then, when the set value of the fan 14 for the freezer reaches the maximum value of 5, step S201 is established (Yes), the set value of the fan 14 for the freezer is not changed, and the process proceeds to the determination of step S203.

In addition, when it is determined in step S203 that "the amount of frosting is large" (Yes in step S203), it is determined whether the difference between the set value of the freezer compartment fan 14 and the set value of the refrigerating compartment fan 15 is 2 or more. (step S301). When step S301 is established (Yes), then, in step S205, the setting value of the fan 15 for refrigerator compartments is incremented by 1.

Next, a case where it is determined in step S105 that the thermal load of the refrigerator compartment is large will be described. Step S105 is established, for example, when the refrigerator compartment door 3a is opened for a long time, or when food at a normal temperature or higher is stored in the freezer compartment 2 . When step S105 is established, it is next determined whether or not the fan setting value for a refrigerator compartment has reached the maximum (step S207). When step S207 is not established (No), 1 is added to the set value of the fan for refrigerator compartments (step S208), and it transfers to determination of the frosting amount to a cooler (step S209). When step S207 is established, it transfers to step S209 without changing the fan setting value for refrigerating compartments. The determination of the amount of frosting in step S209 is the same as that in step S203. If step S209 is not established (No), it is determined whether the difference between the set value of the fan 14 for the freezer and the set value of the fan 15 for the refrigerating room is 3 or more (Step S201 ), when step S209 is established, it is determined whether the difference between the set value of the freezer compartment fan 14 and the set value of the refrigerating compartment fan 15 is 2 or more (step S303 ). When step S210 or step S303 is established (Yes), 1 is added to the setting value of the fan 14 for freezing compartments (step S211), and it transfers to the determination of whether backflow exists (step S212). When step S210 or step S303 is not established, the setting value of the fan 14 for freezing compartments is not changed, and it transfers to step S212. The determination of step S212 is the same as that of step S206. When step S212 is established (Yes), the set value of the fan 14 for the freezer compartment is raised to the set value of the fan 15 for the freezer compartment, and the fan 14 for the freezer compartment and the freezer compartment The fan 15 becomes the same set value (step S304). On the other hand, when step S212 is not established, it transfers to the determination of step S106 in FIG. 6 .

Next, the frosting amount determination operation will be described. Step S106 in FIG. 6 , which determines whether or not the frosting amount judging operation is performed, is established (Yes) when 30 minutes or more have elapsed since the previous frosting amount judging operation was completed. Here, the reason why it is 30 minutes is because it is conceivable that if it is about 10 minutes or 20 minutes, the elapsed time from the previous determination is short, and the state of frosting does not last too long. When step S106 is established, frosting amount determination operation is performed in step S213 of FIG. 7 . The frosting amount judging operation is an operation for detecting the amount of frosting based on whether backflow is likely to occur depending on the amount of frosting in the cooler 16 (the reason will be described later). Specifically, the rotation speeds of the freezer compartment fan 14 and the refrigerator compartment fan 15 are changed to the set value 1 and the set value 2 respectively, and the result is determined based on the change in the freezer compartment temperature two minutes after the change of the fan speed. Operation of the amount of frost. Refrigerator 1 determines that cooler 16 is in the "excessive frosting" state when the freezer compartment temperature has risen by 0.5° C. or more by the frosting amount judging operation, and the defrosting condition in step S214 is satisfied (Yes). When step S214 is not established, the fan 14 for a freezer compartment and the fan 15 for a refrigerator compartment become the set value before execution of frosting amount determination operation, and it transfers to step S107 of FIG.

If step S214 of FIG. 7 is established, then compressor 25 , freezer fan 14 , and refrigerator fan 15 are stopped, and defrosting heater 29 is started to be energized to perform a defrosting operation (step S215 ). The defrosting operation ends when the defrosting end condition is satisfied (step S216 in FIG. 7 ). Step S216 is established (Yes) when the temperature of the cooler detected by the cooler temperature sensor 53 has risen and reached 8° C. where it is assumed that defrosting has been completed. When step S216 is established, next, the set value of the fan 14 for the freezing compartment and the set value of the fan 15 for the refrigerating compartment are all set to a maximum value of 5 (step S217 of FIG. Step S103, implementing refrigerating and freezing operation.

With the above control, the time-average temperature of the freezer compartment 2 is maintained at about -19°C, and the time-average temperature of the refrigerator compartment 3 is maintained at about 4°C.

As mentioned above, the structure and control method of the refrigerator of this embodiment were demonstrated, Next, the effect acquired by the refrigerator of this embodiment is demonstrated.

The refrigerator 1 of the present embodiment is equipped with a cooler compartment 17 for accommodating the cooler 16, a freezer compartment air duct 21 leading from the cooler compartment 17 to the freezer compartment 2, and a freezer compartment return path leading from the freezer compartment 2 to the cooler compartment 17. The air duct (freezing compartment air supply duct 21 and freezing compartment return air duct collectively referred to as "freezing compartment side air duct") formed by the air duct (refrigerated air return port 5) leads from the cooler compartment 17 to the refrigerating compartment 3 The refrigerating room air duct 22 and the air duct formed by the refrigerating room returning air duct 23 leading from the refrigerating room to the cooler room 17 (the refrigerating room air duct 22 and the refrigerating room returning air duct 23 are collectively referred to as "refrigerating room side wind "), the freezer fan 14 for circulating cold air to the freezer side air duct, and the refrigerator compartment fan 15 for circulating cold air to the refrigerator side air duct.

When simultaneously driving the fan 14 for the freezer and the fan 15 for the refrigerator to cool, the control is to adjust the rotation speed of the fan 14 for the freezer and the fan 15 for the refrigerator so that the boosting capacity of the fan 14 for the freezer is the same as that of the refrigerator. The difference in boosting capability of the fan 15 falls within a predetermined range (steps S204 and S210 in FIG. 7 ). Thereby, it is possible to provide a refrigerator that can suppress the backflow of the cold air returned from the refrigerator compartment to the freezer compartment 2 or the counterflow of the cold air returned from the freezer compartment to the refrigerator compartment 3, and it is difficult for the temperature of the freezer compartment 2 to rise abnormally or the temperature of the refrigerator compartment 3 to rise during the cooling operation. In such a situation where the temperature drops too much locally, the inside of the box is well cooled. The reason for this will be described with reference to FIGS. 9 and 10 . Here, the so-called reverse flow is a phenomenon in which the returned cold air flowing out from one storage room does not flow into the cooler room 17, but flows in from the cold air return port of the other storage room.

Fig. 9a, Fig. 9b, Fig. 9c are the pattern diagrams of the air duct and cold air flow of the refrigerator, the downstream side area of the cooler 16 in the cooler chamber 17 is area 0, the blowing side area of the fan 14 for the freezer is area 1, The area on the blowing side of the fan 15 for refrigerator compartment is an area 2 , and the area on the upstream side of the cooler 16 in the cooler room 17 is an area 3 . According to the magnitude relationship of the boosting capabilities of the fan 15 for the refrigerator compartment and the fan 14 for the freezer compartment, the respective pressures P0 to P3 in the regions 0 to 3 are in the three states shown in Fig. 9a, Fig. 9b, and Fig. 9c.

Fig. 9a shows the state where the pressures P0-P3 in the regions 0-3 are controlled to be P1>P3>P0, P2>P3>P0 by driving the fan 15 for the refrigerator compartment and the fan 14 for the freezer compartment. Since cold air flows from the side with high pressure to the side with low pressure, the flow in the refrigerator at this time is formed as shown by the arrow in Fig. 9a. The freezer compartment 2 and the refrigerator compartment 3 are in a state of being supplied with cold air having exchanged heat with the cooler 16, so the refrigerator is well and stably cooled.

Next, consider the case where the pressurization capacity of the fan 14 for freezer compartments is relatively lowered with respect to the fan 15 for refrigerator compartments from the state of FIG. 9a. For example, the rotation speed of the fan 14 for freezer compartments is decreased from the state of FIG. 9a, and the rotation speed of the fan 15 for refrigerator compartments is increased. In this case, the pressure P1 in the region 1 is relatively lower than the pressure P2 in the region 2, and the pressure relationship in FIG. 9a no longer holds, and a state of P2>P3>P1>P0 is established.

Fig. 9b is a diagram showing the flow of cold air when the pressure relationship is in the state of P2>P3>P1>P0. Since the cold air flows from the high pressure side to the low side, the cold air sent by the fan 15 for the refrigerator compartment enters the zone 3 and then flows to both the zone 1 and the zone 0, which are lower than the pressure P3 in the zone 3. Therefore, the flow to the region 1 is a reverse flow from the freezer cool air return port 5 to the freezer cool air outlet 4 side through the freezer compartment 2 (the flow indicated by the dotted arrow in FIG. 9 b ). The cold air flowing back into the freezer 2 from the cold air return port 5 in the freezer is the return air from the refrigerator 3 , so the temperature and humidity are high, resulting in excessive temperature rise near the cold air return port 5 in the freezer and unintended frosting. the main reason.

Similarly, the case where the pressure boosting capability of the fan 14 for freezer compartments is relatively increased with respect to the fan 15 for refrigerator compartments from the state of FIG. 9a is considered. For example, the rotation speed of the fan 14 for freezing compartments is increased from the state of FIG. 9a, and the rotation speed of the fan 15 for refrigerator compartments is decreased. In this case, the pressure P1 in the region 1 rises relatively to the pressure P2 in the region 2, and the pressure relationship in FIG. 9a no longer holds, and a state of P1>P3>P2>P0 is established.

Fig. 9c is a diagram showing the flow of cold air when the pressure relationship is in the state of P1>P3>P2>P0. In this case, the return cold air flowing out from the freezer compartment 2 is divided into a flow to the cooler 16 and a flow back to the refrigerator compartment 3 . At this time, the cold air flowing back from the cold air return port 7 of the refrigerator compartment to the refrigerator compartment 3 (the flow shown by the dotted arrow in Fig. 9c) is due to the returned cold air flowing out of the freezer compartment 2, so it is at a low temperature relative to the refrigerator compartment 3. The vicinity of the room-cooled air return port is excessively cooled, which may cause unintentional food freezing. As described above, depending on the magnitude relationship between the boosting capabilities of the fan 15 for the refrigerator and the fan 14 for the freezer, even if both the fan 15 for the refrigerator and the fan 14 for the freezer are being driven, there may be a case where a backflow occurs in one of the storage rooms. A condition where the refrigerator is no longer being cooled well.

Therefore, in the refrigerator 1 of the present embodiment, the fan 15 for the refrigerator compartment and the fan for the freezer compartment are obtained in advance so that the respective pressures P0 to P3 in the regions 0 to 3 are in the relationship of P1>P3>P0 and P2>P3>P0. 14 combinations of rotational speeds, and the rotational speeds of the refrigerator compartment fan 15 and the freezer compartment fan 14 during the refrigeration and freezer compartment cooling operations are selected from the combinations.

FIG. 10 is a table showing combinations of rotation speed setting values 1 to 5 of the freezer compartment fan 14 and rotation speed setting values 1 to 5 of the refrigerator compartment fan 15 in the refrigerator 1 and the presence or absence of backflow. The combinations represented by the marks ◎, ○, and Δ in Fig. 10 are the combinations where the pressures P0~P3 in the areas 0~3 meet the relationship of P1>P3>P0, P2>P3>P0, and the marks ◎ are regardless of the amount of frosting In any case, there is no backflow state. The mark ○ is the state of backflow when the amount of frost is too large, and the mark Δ is the case of backflow when the amount of frost is large. Both of them can perform good and stable cooling. The combination.

On the other hand, the combination indicated by the mark X in FIG. 10 is a combination in which the respective pressures P0 to P3 in the regions 0 to 3 are P2>P3>P1>P0 or P1>P3>P2>P0 to cause backflow.

Then, in the refrigerator 1, through steps S204 and S210 in FIG. 7, the combination of the rotation speeds of the fan 15 for the refrigerator compartment and the fan 14 for the freezer compartment that does not generate backflow is controlled (the combination indicated by the mark ○ in FIG. 10 ), During the cooling operation, the temperature of the freezer compartment 2 abnormally rises or the temperature of the refrigerator compartment 3 partially falls excessively, and cooling is performed satisfactorily.

The refrigerator 1 of the present embodiment is equipped with a frosting amount estimation unit (steps S203 and S209 in FIG. 7 ), and when the freezer compartment fan 14 and the refrigerating compartment fan 15 are simultaneously driven for cooling, the frosting amount estimation unit is used to determine that it is frosted. When the amount of frost is large, the control is to adjust the rotation speed of the fan 14 for the freezer compartment and the rotation speed of the fan 15 for the refrigerator compartment so that the difference between the boosting capacity of the fan 14 for the freezer compartment and the boosting capacity of the fan 15 for the refrigerator compartment falls within within the specified range (steps S301 and S303 in FIG. 7 ). Thereby, it is possible to provide a refrigerator in which even in the case of frost, it is possible to suppress the backflow of the cold air returned from the refrigerator compartment from the cold air return port 5 of the freezer compartment to the freezer compartment 2, and the cold air returned to the freezer compartment from the cold air return port 7 of the refrigerator compartment to the refrigerator compartment. The backflow of the compartment 3 is unlikely to cause the temperature of the freezing compartment 2 to rise abnormally or the temperature of the refrigerating compartment 3 to partially drop too much during the cooling operation. The reason will be described with reference to FIG. 11 a , FIG. 11 b and FIG. 12 .

Fig. 11a and Fig. 11b are graphs showing the relationship between the amount of frost deposited on the cooler and the air volume of the freezer compartment and the air volume of the refrigerator compartment. When there is a lot of frost on the cooler (large amount of frost).

As shown in Fig. 11a, when the amount of frost on the cooler 16 is small, it shows that when the rotational speed of the fan 15 for the refrigerating chamber is kept constant and the rotational speed of the fan 14 for the freezing chamber is changed, the frosting for the freezing chamber is reduced. In the region A where the rotation speed of the fan 14 is low, since the boosting capacity of the fan 14 for the freezer is relatively smaller than that of the fan 15 for the refrigerator, the air volume in the freezer is negative and reverse flow occurs. That is, in the region A, the flow field shown in FIG. 9b is formed. On the other hand, it shows that in the region B where the rotational speed of the fan 14 for the freezer is high, since the boosting capacity of the fan 14 for the freezer is relatively greater than that of the fan 15 for the refrigerator, the air volume in the refrigerator is negative and reverse flow occurs. . That is, in the region B, the flow field shown in FIG. 9c is formed.

On the other hand, when there is a lot of frosting, if the fan 15 for the refrigerating compartment is maintained at the same rotational speed as in FIG. Area A and area B where the room air volume is negative expand. This is due to an increase in the ventilation resistance of the cooler 16 due to frost formation. After the ventilation resistance of the cooler 16 increases, the pressure drop when the cold air passes becomes larger, so the pressure difference between the area 3 and the area 0 shown in FIG. 9 a becomes larger. Therefore, relative to P0, P3 rises relatively, so it is easy to produce the pressure relationship P2>P3>P1>P0 in Figure 9b or the pressure relationship P1>P3>P2>P0 in Figure 9c. That is, the risk of backflow to freezer compartment 2 or refrigerator compartment 3 increases as the amount of frost deposited on cooler 16 increases.

Therefore, in the refrigerator 1 of the present embodiment, not only under the condition of a small amount of frosting, but also under the condition of a large amount of frosting, the pressures P0 to P3 in the regions 0 to 3 are obtained in advance so that the pressures P0 to P3 are P1> P3>P0, P2>P3>P0 the combination of the rotation speed of the fan 15 for the refrigerator compartment and the fan 14 for the freezer compartment, and the fan 15 for the refrigerator compartment and the fan 15 for the freezer compartment during the cooling operation of the refrigerator compartment and the freezer compartment are selected from this combination. The speed of the fan 14. The combination of the rotational speed setting values of the freezer fan 14 and the refrigerating room fan 15 represented by the marks ◎ and ○ in FIG. The combination of the relationship of P1>P3>P0 and P2>P3>P0 is a combination capable of cooling the refrigerator well. On the other hand, the combinations represented by the marks Δ and × in Fig. 10 are such that the pressures P0 to P3 in the areas 0 to 3 are P2>P3>P1>P0 or P1>P3>P2 under the condition that the amount of frost is large >P0 so that countercurrent occurs. Therefore, in the refrigerator 1, the amount of frosting is determined through steps S203 and S209 in FIG. 7, and the combination of the rotation speeds of the fan 15 for the refrigerator compartment and the fan 14 for the freezer compartment that does not generate backflow is controlled (indicated by the symbol ○ in FIG. 12 ). combination shown) (steps S301 and S303 in FIG. 7 ), thus becoming a refrigerator in which the temperature of the freezer compartment 2 is unlikely to rise abnormally or the temperature of the refrigerator compartment 3 to partially drop too much even if the cooler 16 is frosted during the cooling operation.

Refrigerator 1 of the present embodiment adjusts the freezer compartment when backflow is detected based on changes in the detected temperatures of freezer compartment temperature sensor 51 and refrigerating compartment temperature sensor 52 when the freezer compartment fan 14 and the refrigerating compartment fan 15 are simultaneously driven for cooling. With the set value of the rotating speed of the fan 14 and the rotating speed of the fan 15 for the refrigerating room, the difference between the boosting capacity of the fan 14 for the freezing room and the boosting capacity of the fan 15 for the refrigerating room falls within the prescribed range (Fig. 7). Steps S206, S212, S302, S304). Specifically, when reverse flow is detected, the set value of the rotational speed of the fan 14 for the freezing compartment and the rotational speed of the fan 15 for the refrigerating compartment are the same value, that is, the fan for the freezing compartment shown by the mark ◎ in FIG. 14. The combination of the fan 15 for the cold room. As mentioned above, the marks ◎ and ○ shown in FIG. 10 are the combination of the setting values of the freezer fan 14 and the refrigerator fan 15 that can cool the refrigerator well under the condition that there is a lot of frosting. increase, and a combination in which backflow does not occur even when the inter-fin flow passage of the cooler 16 is nearly closed. Therefore, even if backflow occurs when the combination of the freezer compartment fan 14 and the refrigerator compartment fan 15 shown by the marks ○ and Δ in FIG. The combination of the fan 14 for the freezer compartment and the fan 15 for the refrigerator compartment shown by the mark ◎ in 10 can prevent the state of backflow from continuing, and it can be within the range of no influence (freezing occurs in the refrigerator compartment, or frozen food thawed, or non-frosted range) to return to a well-cooled state.

In the refrigerator 1 of the present embodiment, the ventilation resistance of the side air passage of the refrigerator compartment is large. Therefore, even if frost is formed, it is difficult for the refrigerator to generate backflow. The reason is explained below.

Usually, when cooling the refrigerator compartment 3 and the freezer compartment 2 at the same time, it is designed so that the air flow rate to the refrigerator compartment 3 which should maintain a high temperature is low compared with a freezer compartment. In order to make the air flow rate to the refrigerator compartment 3 lower than that to the freezer compartment 2, it may be considered to reduce the boosting capacity of the fan 15 for the freezer compartment (at a low speed) relative to the fan 14 for the freezer compartment, or to drive the fan 15 at a low speed. The ventilation resistance of the side air duct of the refrigerator is greater than that of the side air duct of the freezer. Regarding the former, as described above, when the boosting capacity of the fan 15 for the refrigerating room is relatively lower than that of the fan 14 for the refrigerating room and is driven, frost will form and the risk of backflow will increase, so backflow is likely to occur. refrigerator. Therefore, in order to make it difficult for the refrigerator to generate backflow, it is preferable to make the ventilation resistance of the air passage on the refrigerating chamber side larger than that on the air passage on the freezing chamber side as a measure to make the air flow rate to the refrigerating chamber 3 lower than that of the freezing chamber 2 .

Refrigerator 1 according to the present embodiment includes refrigerator compartment damper 27 in the refrigerator compartment side air duct having a large ventilation resistance. Thereby, while securing a large food storage space, the risk of backflow can be reduced. In order to reduce the risk of backflow, it is effective to provide a damper in the air duct. However, if the damper is provided, the ineffective internal volume of the food storage part increases correspondingly, resulting in a problem that the food storage space decreases. Therefore, from the viewpoint of securing a large food storage space, it is not preferable to separately provide dampers in the refrigerator compartment air duct and the freezer compartment air duct. Therefore, when it is considered to install a damper in one of the side air duct of the refrigerator compartment and the side duct of the freezer compartment, it is necessary to select a damper with a balanced opening area and ventilation resistance. At this time, as long as the side air duct of the refrigerating room is designed to have a relatively large ventilation resistance, a compact damper with a small opening area can be provided. Therefore, when disposing the damper in order to reduce the risk of backflow while securing a large food storage space, it is effective to dispose the damper in the side air duct of the refrigerating room having a large ventilation resistance.

The refrigerator 1 of the present embodiment utilizes the characteristic that backflow is likely to occur when the amount of frost deposited on the cooler 16 increases, and performs a defrosting operation when backflow is detected ( 213 to S215 in FIG. 7 ). As a result, the frost on the cooler 16 can be melted before the amount of frost forming on the cooler 16 increases excessively, so during the cooling operation, it is difficult for the temperature of the freezing compartment 2 to rise abnormally or the temperature of the refrigerating compartment 3 to partially drop too much due to backflow. In such a situation, it is possible to more accurately determine whether or not the amount of frost required for defrosting has been reached, so that the implementation of the defrosting operation can be suppressed to the necessary minimum. Therefore, the amount of electric power required for defrosting can be reduced, resulting in a refrigerator with high energy-saving performance.

Example 2

Next, a second embodiment of the refrigerator according to the present invention will be described with reference to FIG. 12 . Moreover, since the structure other than the structure shown in FIG. 12 is the same as the refrigerator 1 of 1st Embodiment, description is abbreviate|omitted. In addition, in FIG. 12, the same code|symbol is attached|subjected to the element which exhibits the same function as the refrigerator 1 of 1st Embodiment, and description is abbreviate|omitted.

Fig. 12 is a schematic diagram of a cooling air duct of the refrigerator according to the second embodiment. FIG. 12 shows a state in which cold air circulates in the freezer compartment 2 and the refrigerator compartment 3 when the refrigerator compartment damper 27 is opened and the freezer compartment fan 14 and the refrigerator compartment fan 15 are both driven. As shown by the arrow in FIG. 5 , the cold air in the area (area 0 ) on the downstream side of the cooler after being cooled by the cooler 16 is boosted by the fan 14 for the freezer compartment, and flows into the area on the blowing side of the fan 14 for the freezer compartment (area 1 ). , flows into the freezer compartment 2 from the freezer compartment cold air outlet 4 through the freezer compartment air supply duct 21 . The cold air that has cooled freezer compartment 2 returns to the area (area 3 ) on the upstream side of cooler 16 in cooler room 17 through freezer compartment cold air return port 5 , and is cooled by cooler 16 again.

On the other hand, part of the cool air in zone 0 cooled by cooler 16 is pressurized by refrigerating room fan 15 and flows into the area on the blowing side of refrigerating room fan 15 (zone 2 ). A part of the cool air in zone 2 flows into zone 1 through the pressure regulating channel 60 communicating with zone 1 , and the rest flows into the refrigerating room 3 through the refrigerating room air supply channel 22 from the refrigerating room cold air outlet 6 . The cold air after cooling the refrigerator compartment 3 flows from the refrigerator compartment cold air return port 7 through the refrigerator compartment return air duct 23 and returns to the upstream side area (area 3 ) of the cooler 16 of the cooler compartment 17 , and is cooled by the cooler 16 again.

Moreover, the opening area of the pressure regulating flow channel 60 is 200 mm ² , which is larger than that of the refrigerated air duct 22 from the refrigerating room to the cooler room 17 via the refrigerating room cold air outlet 6 , the refrigerating room cold air returning port 7 , and the refrigerating room returning air duct 23 . The ventilation resistance of the compartment side air duct and the freezer compartment side air duct from the freezer compartment air supply duct 21 to the cooler compartment 17 via the freezer cool air outlet 4 and the freezer cool air return port 5 is large.

As described above, the refrigerator according to the second embodiment includes the pressure adjustment flow path 60 communicating between the blowing-side area (area 1 ) of the freezer fan 14 and the blowing-side area (area 2 ) of the refrigerating room fan 15 . Thereby, it is possible to provide a refrigerator that can suppress the backflow of cold air returned from the refrigerator compartment to the freezer compartment 2 and the counterflow of cold air returned from the freezer compartment to the refrigerator compartment 3. It is difficult to reduce such a situation, and the inside of the box is well cooled. The reason is explained below.

Assuming that the pressures in the regions 0 to 3 of the refrigerator according to the second embodiment shown in FIG. 12 are P0' to P3', and when the pressure P2' in the region 2 is relatively higher than the pressure P1' in the region 1, use The pressure adjustment channel 60 moderates the increase in the pressure P2 ′ in the region 2 and the decrease in the pressure P1 ′ in the region 1 . Therefore, since the pressure P1' of the area|region 1 is hard to fall compared with the pressure P3' of the area|region 3, it becomes a refrigerator in which backflow to the freezer compartment 2 is hard to generate|occur|produce. Also, when the pressure P1 ′ in the region 1 is relatively higher than the pressure P2 ′ in the region 2 , the pressure adjustment channel 60 moderates the increase in the pressure P1 ′ in the region 1 and the decrease in the pressure P2 ′ in the region 2 . Therefore, since the pressure P2' of the area|region 2 is hard to drop compared with the pressure P3' of the area|region 3, it becomes a refrigerator in which backflow to the refrigerator compartment 3 is hard to generate|occur|produce.

In the refrigerator of the second embodiment, the ventilation resistance of the pressure adjustment flow path 60 is made larger than the ventilation resistances of both the refrigerator compartment side duct and the freezer compartment side duct. Thereby, sufficient cold air can be supplied to freezing room 2 and refrigerating room 3 . The pressure regulating channel 60 has a pressure regulating effect and cold air also flows from the high pressure side to the low pressure side. A large amount of the sent cold air flows through the pressure adjustment flow path 60 to the blowing area of the fan 14 for freezing compartment. Therefore, a situation occurs that the predetermined air volume can no longer be sent to the refrigerator compartment 3 . Also, when the ventilation resistance of the pressure regulating flow path 60 is smaller than the ventilation resistance of the freezer-side air path, a problem that a predetermined amount of air cannot be sent to the freezer compartment 2 similarly arises. Then, in the refrigerator of the second embodiment, by making the ventilation resistance of the pressure regulating flow path 60 larger than the ventilation resistance of both the refrigerator compartment side air duct and the freezer compartment side air duct, it is possible to supply air to the freezer compartment 2 and the refrigerator compartment 3 . Plenty of air conditioning.

In addition, this invention is not limited to the above-mentioned Example, Various modification examples are included. For example, in the refrigerator of the above-mentioned embodiment, the amount of frosting is estimated based on the outside air temperature, the compressor driving time, and the number of door opening and closing times, but it is not necessary to use all the conditions for determination. In addition, the amount of frosting can also be estimated by detecting other factors that affect the amount of frosting, such as the humidity of the outside air and the humidity in the box. In the refrigerator of the above-mentioned embodiment, the combination of the rotational speeds of the freezer compartment fan 14 and the refrigerating compartment fan 15 that does not cause backflow is determined using the table shown in FIG. The relationship between the fan 14 for a freezer compartment and the fan 15 for a refrigerator compartment is determined according to regulations. In addition, in the refrigerator of the above-mentioned embodiment, the temperature detected by the freezer compartment temperature sensor 51 and the refrigerating compartment temperature sensor 52 is used to determine the reverse flow. A temperature sensor for backflow detection that detects backflow. In addition, a pressure sensor can be used to detect the pressure distribution shown in Fig. 9b and Fig. 9c to determine the reverse flow. In addition, in the refrigerator of the above-mentioned second embodiment, the pressure adjustment flow path 60 is provided, and the ventilation resistance of the pressure adjustment flow path 60 can be changed by using a valve or the like, so that the ventilation resistance can be controlled to be reduced when backflow is detected. That is, the above-mentioned embodiments have been described in detail for the purpose of explaining the present invention in an easy-to-understand manner, and are not limited to necessarily having all the described configurations.

Claims (5)

1. a refrigerator, possess the refrigerating chamber as cryogenic temperature band room, the refrigerating chamber as refrigerated storage temperature band room, storage cooler cooler room, from this cooler room through described refrigerating chamber again return described cooler room refrigerating chamber cool-air duct, from described cooler room through described refrigerating chamber again return described cooler room refrigerating chamber cool-air duct, to the first pressure fan of described refrigerating chamber cool-air duct air-supply and the second pressure fan to described refrigerating chamber cool-air duct air-supply, the feature of this refrigerator is

Set or adjust the speed combination of described first pressure fan and described second pressure fan, the relation between the downstream pressure P0 of the blowout areal pressure P2 of the blowout areal pressure P1 of described first pressure fan, described second pressure fan, the upstream pressure P3 of the described cooler of described cooler room, the described cooler of described cooler room is made to become P1>P3>P0 and P2>P3>P0

Possesses the adverse current detecting unit that the adverse current flowed into from the cold air return port of described refrigerating chamber or the cold air return port of described refrigerating chamber is detected, when described adverse current being detected when implementing cooling running, set the rotating speed of described first pressure fan and described second pressure fan, thus return to the state not producing described adverse current.

2. refrigerator according to claim 1, is characterized in that,

The frosting degree presumption units of the frosting degree detecting unit possessing the frosting degree detecting described cooler or the frosting degree inferring described cooler, based on described frosting degree detecting unit or described frosting degree presumption units, set the rotating speed of described first pressure fan and described second pressure fan.

3. refrigerator according to claim 1 and 2, is characterized in that,

The flowing resistance of described refrigerating chamber cool-air duct is made relatively to be greater than described refrigerating chamber cool-air duct.

4. refrigerator according to claim 3, is characterized in that,

Flowing resistance adjustment unit is provided with at described refrigerating chamber cool-air duct.

5. a refrigerator, possesses cooler, melt the defrost unit of the frost of described cooler, as the refrigerating chamber of cryogenic temperature band room, as the refrigerating chamber of refrigerated storage temperature band room, receive the cooler room of described cooler, again return the refrigerating chamber cool-air duct of described cooler room through described refrigerating chamber from described cooler room, again return the refrigerating chamber cool-air duct of described cooler room through described refrigerating chamber from described cooler room, to the refrigerating chamber pressure fan of described refrigerating chamber cool-air duct flowing cold air, and to the refrigerating chamber pressure fan of described refrigerating chamber cool-air duct flowing cold air, the feature of this refrigerator is,

Possessing the adverse current detecting unit that the adverse current of the cold air return port of the cold air return port or described refrigerating chamber flowing to described refrigerating chamber is detected, implementing the defrosting running of described defrost unit when carrying out cooling running based on described adverse current detecting unit.