CN109990561B

CN109990561B - Refrigerator and control method thereof

Info

Publication number: CN109990561B
Application number: CN201711483651.0A
Authority: CN
Inventors: 牛向伟; 王伟
Original assignee: Panasonic Refrigeration Devices Wuxi Co Ltd; Panasonic R&D Center Suzhou Co Ltd
Current assignee: Panasonic Refrigeration Devices Wuxi Co Ltd; Panasonic R&D Center Suzhou Co Ltd
Priority date: 2017-12-29
Filing date: 2017-12-29
Publication date: 2022-08-23
Anticipated expiration: 2037-12-29
Also published as: CN109990561A

Abstract

The invention provides a refrigerator and a control method thereof, the refrigerator is provided with a compartment, an evaporator, a fan, an air path and a baffle arranged in the air path, cold air generated by the evaporator is guided into the compartment through the air path by the fan and returns to the evaporator, at least 2 baffles are arranged in the air path, and the at least 2 baffles set the opening and closing angle and the opening and closing frequency respectively according to the environment temperature and the set temperature. According to the refrigerator disclosed by the invention, the uniformity of the temperature in the compartment can be ensured.

Description

Refrigerator and control method thereof

Technical Field

The present invention relates to a refrigerator, and more particularly, to a refrigerator capable of securing uniformity of temperature in a compartment.

Background

Fig. 7 is a schematic view of a prior art cross-door refrigerator. Fig. 8 is a schematic view of the evaporator and air passage structure of a prior art cross-door refrigerator. Fig. 9 is a perspective view illustrating a shutter of a prior art cross-door refrigerator.

As shown in fig. 7 and 8, in a conventional large-sized cross-door refrigerator, it is desired to realize a function including a refrigerating chamber 81, a freezing chamber 82, and a wide temperature-varying chamber 83, and the wide temperature-varying chamber 83 needs to be independently controlled. In order to satisfy the requirement that one compartment in the refrigerator has the function of wide temperature variation (temperature zone: 10 to-25 ℃) and enable the wide temperature variation chamber to achieve a certain refrigeration effect, the current method is realized by a baffle plate as shown in figure 9, namely: when the requirement of the indoor temperature is met, the baffle 84 is closed, and when the indoor temperature needs to be cooled, the baffle 84 is completely opened. This leads to two problems:

firstly, when a low load is set in the compartment, the opening and closing times of the baffle 84 are reduced, so that the temperature distribution in the compartment is uneven, and the food preservation time is influenced;

secondly, in the low-load condition, because the times of opening and closing the baffle 84 are reduced, the periphery of the baffle is easy to freeze, so that the baffle is frozen, and an anti-freezing heater needs to be additionally arranged on the periphery of the baffle 84, so that the power consumption is increased.

In addition, the existing large-scale cross-door refrigerator and the existing air-cooled refrigerator which supplies air to the refrigerating chamber through the baffle also have the problems of uneven indoor temperature distribution and easy icing around the baffle.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object thereof is to provide a refrigerator capable of ensuring uniformity of temperature in a compartment.

The refrigerator of the present invention includes a compartment, an evaporator, a fan, an air duct, and a damper provided in the air duct, wherein cool air generated by the evaporator is introduced into the compartment through the air duct by the fan and returns to the evaporator, at least 2 dampers are provided in the air duct, and the at least 2 dampers are set to open and close angles and open and close frequencies thereof respectively in accordance with an ambient temperature and a set temperature.

According to the refrigerator, the entering amount of cold air in the chamber is adjusted through at least 2 baffle plates, so that the uniformity of the temperature in the chamber can be ensured.

In the refrigerator according to the present invention, it is preferable that the at least 2 shutters be a first shutter and a second shutter having a larger shielding area than the first shutter, and the first shutter and the second shutter be arranged side by side in the air passage. According to such a configuration, the amount of cooling air entering the compartment is adjusted by the 2 baffle plates arranged side by side, and the uniformity of the temperature in the compartment can be further ensured.

In addition, preferably, in the refrigerator of the present invention, the shielding area of the first baffle is 1/3 to 1/2 of the shielding area of the second baffle. According to the structure, the combination of the total shielding areas of the 2 baffles can be further increased, so that the uniformity of the temperature in the compartment can be further ensured.

In the refrigerator according to the present invention, it is preferable that, when the time required for the opening/closing frequency of each shutter reaches a predetermined time, each shutter is forcibly opened and closed once regardless of whether the temperature in the compartment reaches the set temperature. According to the structure, the opening and closing times of the baffle plate are not reduced even in the low load condition, so that the icing on the periphery of the baffle plate can be prevented, and an anti-freezing heater does not need to be added.

Further, it is preferable that the refrigerator of the present invention includes: a first chamber, the back of which is provided with a first evaporator; and a second compartment sharing the first evaporator with the second compartment, wherein the cool air generated by the first evaporator is introduced into the first compartment through a first duct by a fan and returned to the first evaporator, the cool air generated by the first evaporator is introduced into the second compartment through a second duct by a fan and returned to the first evaporator, at least 2 baffles are provided in the second duct, and the at least 2 baffles set respective opening and closing angles and opening and closing frequencies according to an ambient temperature and a set temperature. By the structure, the two chambers share one evaporator, and the uniformity of the temperature in the chambers is ensured.

Another object of the present invention is to provide a control method of a refrigerator including a compartment, an evaporator, a fan, an air path in which at least 2 dampers are provided, and a damper provided in the air path, wherein cool air generated by the evaporator is introduced into the compartment through the air path by the fan and is returned to the evaporator, the method comprising: a determination step of determining whether the current temperature in the compartment reaches a set temperature; setting, namely setting the opening and closing angle of each baffle according to the environment temperature and the set temperature; an opening step of opening each baffle according to the opening and closing angle of each baffle; and a closing step of closing each of the shutters. When the determination result of the determining step is "no", executing the setting step and the opening step; when the determination result of the determining step is yes, the closing step is performed. . According to the control method of the refrigerator, the uniformity of the temperature in the compartment can be ensured.

In the control method of the refrigerator according to the present invention, it is preferable that the setting step further sets the opening/closing frequency of each of the shutters based on an ambient temperature and the set temperature, and the control method further includes an opening/closing frequency determination step of determining whether or not the closing time of each of the shutters reaches a time specified by the opening/closing frequency after the closing step. When the judgment result in the opening and closing frequency judging step is negative, executing the judging step; and when the judgment result in the opening and closing frequency judging step is 'yes', executing the opening step. Therefore, the number of times of opening and closing the baffle plate is not reduced even in a low load condition, the periphery of the baffle plate can be prevented from icing, and an anti-freezing heater does not need to be added.

In the method of controlling a refrigerator according to the present invention, it is preferable that the at least 2 dampers include a first damper and a second damper having a larger shielding area than the first damper, and the first damper and the second damper are disposed in parallel in the air passage. According to such a configuration, the amount of cooling air entering the compartment is adjusted by the 2 baffle plates arranged side by side, and the uniformity of the temperature in the compartment can be further ensured.

In the control method of a refrigerator according to the present invention, it is preferable that the setting step sets the ambient temperature and the set temperature in a plurality of segment regions, respectively, and a combination of numerical values of the opening and closing angles of the shutters is set in accordance with a combination of different segment regions of the ambient temperature and the set temperature, respectively. Therefore, the combination of the opening and closing angles of the baffles can be set according to the combination of the environment temperature and the set temperature, and the uniformity of the indoor temperature can be further ensured.

In the control method of a refrigerator according to the present invention, it is preferable that the setting step sets the ambient temperature and the set temperature in a plurality of segment regions, respectively, and a combination of the numerical values of the opening/closing frequency of each shutter is set in accordance with a combination of different segment regions of the ambient temperature and the set temperature, respectively. Thus, the baffle can be forcibly opened and closed at an optimum time, so that the periphery of the baffle can be effectively prevented from freezing, and an anti-freezing heater does not need to be added.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the refrigerator and the control method thereof, the uniformity of the temperature in the chamber can be ensured, and the icing around the baffle plate can be effectively prevented.

Drawings

Fig. 1 is a schematic view showing a refrigerator of the present invention.

Fig. 2 is a schematic view illustrating an evaporator and an air passage of a refrigerator according to the present invention.

Fig. 3 is a perspective view showing a baffle of a refrigerator according to the present invention.

Fig. 4 is a rear view illustrating a return air path of the wide temperature change chamber of the refrigerator according to the present invention.

Fig. 5 is a flowchart of a control method of a refrigerator of the present invention.

Fig. 6 is a flowchart of a control method of a refrigerator of the present invention.

Fig. 7 is a schematic view of a prior art cross-door refrigerator.

Fig. 8 is a schematic view of the evaporator and air passage structure of a prior art cross-door refrigerator.

Fig. 9 is a perspective view illustrating a shutter of a prior art cross-door refrigerator.

Detailed Description

The invention is explained in more detail below with reference to the figures and examples.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the description of the drawings, the same or corresponding portions are denoted by the same reference numerals, and redundant description is omitted.

< integral Structure >

Fig. 1 is a schematic view illustrating a refrigerator of the present invention. Fig. 2 is a schematic view illustrating an evaporator and an air passage of a refrigerator according to the present invention.

The refrigerator comprises a chamber, an evaporator, a fan, an air path and a baffle arranged in the air path, wherein cold air generated by the evaporator is guided into the chamber through the air path by the fan and returns to the evaporator, at least 2 baffles are arranged in the air path, and the at least 2 baffles set the opening and closing angle and the opening and closing frequency of each baffle according to the ambient temperature and the set temperature.

Specifically, as shown in fig. 2, the refrigerator of the present invention includes: a first compartment 12 provided with a first evaporator B on the back surface thereof; and a second compartment 13 that shares the first evaporator B with the first compartment 12, wherein the cool air generated by the first evaporator B is introduced into the first compartment 12 by the fan D through the first duct and returns to the first evaporator B, the cool air generated by the first evaporator B is introduced into the second compartment 13 by the fan D through the second duct and returns to the first evaporator B, and at least 2

baffles

14 and 15 are provided in the second duct, and the respective opening and closing angles and opening and closing frequencies of the at least 2

baffles

14 and 15 are set according to the ambient temperature and the set temperature.

Further, the refrigerator of the present invention may further include: the second evaporator (refrigerating evaporator) B2 is provided on the rear surface of the third compartment (refrigerating compartment) 11, and the cold air generated by the second evaporator B2 is introduced into the third compartment 11 through the second air passage by the fan D2 and returns to the second evaporator B2. Further, a return air inlet C1 for returning to the first evaporator B in the first air passage is provided on the side close to the first evaporator B, and the cold air returned from the return air inlet C1 passes through a return air chamber 17 provided on the rear surface of the refrigerator and returns to the first evaporator B. Here, preferably, the first compartment 11 is a freezing compartment, the second compartment 12 is a wide temperature-variable compartment, the 1 st compartment 11 and the 2 nd compartment 12 are arranged side by side on the left and right, and the positions of the 2 compartments may be reversed; the third compartment 13 is a refrigerator compartment and is located above the 1 st compartment 11 and the 2 nd compartment 12. However, the present invention is not limited to this, and the third compartment may be a vegetable compartment, a drying compartment, a fresh food compartment, or the like. In the above description, the cross-door refrigerator shown in fig. 1 and 2 is taken as an example, but the invention is not limited thereto, and an air-cooled refrigerator that blows air to a refrigerating chamber through a baffle may be used. In this case, the first compartment 12 may be a freezing compartment, the second compartment 13 may be a refrigerating compartment, and the two compartments may be arranged vertically; the 2 compartments share one evaporator, and the cold air generated by the evaporator is guided into the refrigerating compartment through the baffle plate.

< description of the baffle >

Fig. 3 is a perspective view showing a baffle of a refrigerator according to the present invention. As shown in fig. 3, in the refrigerator of the present invention, the at least 2 shutters include a first shutter 14 and a second shutter 15 having a larger shielding area than the first shutter, and the first shutter 14 and the second shutter 15 are disposed side by side in the air passage. With this configuration, the amount of cooling air entering the second chamber 13 can be adjusted by the 2 baffles 14 and 15 arranged side by side, and the uniformity of the temperature in the second chamber 13 can be further ensured.

Further, in the refrigerator of the present invention, it is preferable that the shielding area of the first shutter 14 is 1/3 to 1/2 of the shielding area of the second shutter 15. According to such a structure, the combination of the total shielding areas of the 2 baffles can be further increased, so that the uniformity of the temperature in the second compartment 13 can be further ensured.

Further, in the refrigerator of the present invention, it is preferable that, when the opening/closing frequency of each

shutter

14, 15 reaches a predetermined time, each

shutter

14, 15 is forcibly opened and closed once regardless of whether the temperature in the second compartment 13 reaches the set temperature. According to the structure, the periphery of the baffle can be prevented from icing, so that an anti-freezing heater does not need to be added.

Further, the first and

second shutters

14 and 15 may preferably have any angle between 0 ° and 90 °. For example, when the shutter is closed, its opening and closing angle is 0 °, i.e., 0% is open. When the baffle is just half opened, the opening and closing angle is 45 degrees, namely 45 percent of the baffle is opened. When the baffle is completely opened, the opening and closing angle is 90 degrees, namely 100 percent of the opening and closing angle is opened.

According to the refrigerator, the uniformity of the temperature in the chamber can be ensured, and the icing at the periphery of the baffle plate can be effectively prevented.

< description of air passage >

Fig. 4 is a rear view illustrating a return air path of the wide temperature changing chamber of the refrigerator according to the present invention.

As shown in fig. 2 and 4, in the refrigerator according to the present invention, the refrigerating chamber 11 is refrigerated by the evaporator B2, the refrigerating fan D2 takes out cold air G2 from the evaporator B2 through the air inlet a2, the cold air is blown to the front side of the refrigerating chamber, and finally returns to the refrigerating evaporator B2 through the lower air return opening C2 of the refrigerating evaporator B2, so as to form a refrigerating air path cycle; the freezing chamber 12 is refrigerated by a first evaporator (freezing evaporator) B, a freezing fan D takes out cold air G from the first evaporator B through an air inlet A, the front surface of the cold air is blown to a freezing chamber drawer, and finally the cold air returns to the first evaporator B through a lower air return inlet C of the first evaporator to form a freezing air path circulation; the wide temperature-changing chamber 13 is also refrigerated by the first evaporator B, cool air G1 is brought out from the first evaporator B by the power of the refrigerating fan D, the cool air G1 brought out from the first evaporator B by the air inlet A1 is blown to a drawer of the wide temperature-changing chamber 13 by opening the baffles 14 and 15 arranged at the middle partition plate, and finally the cool air passes through the wide temperature-changing chamber return air inlet C1 at the lower part of the middle partition plate and then flows from the return air cavity 17 to the first evaporator B, so that the wide temperature-changing chamber air path circulation is formed. Here, the return air chamber 17 guides the blown-out cold air to the lower portion of the first evaporator B, and returns to the first evaporator B. Therefore, the wide temperature-changing chamber 13 and the freezing chamber 12 return air are converged together to form an integrated return air duct. With this configuration, the return air from the compartment can be sufficiently heat-exchanged with the evaporator, as compared with a configuration in which the return air of the wide temperature change chamber 13 is returned to the evaporator from the side, thereby increasing the heat exchange efficiency.

As shown in fig. 4, the lower part of the middle partition of the wide temperature-changing chamber and the freezing chamber is provided with an air return chamber 17. The return air chamber 17 guides the blown-out cold air to the lower portion of the first evaporator B, and returns to the first evaporator B. The wide temperature-changing chamber 13 and the freezing chamber 12 return air are converged together to form an integrated return air duct. With this configuration, the return air from the compartment can be sufficiently heat-exchanged with the first evaporator B, as compared with a configuration in which the return air of the wide temperature change chamber 13 is returned to the evaporator from the side, thereby increasing the heat exchange efficiency. Preferably, the return air chamber 17 is provided at the back of the first evaporator B and guides the cold air returned from the return air inlet C1 to the bottom surface of the first evaporator B. With this configuration, the return air from the wide temperature varying chamber 13 can be sufficiently heat-exchanged with the first evaporator B, thereby increasing the heat exchange efficiency. Further, the return air chamber 17 is preferably provided inside the inner container of the refrigerator. An insulating material may be disposed between the return air chamber 17 and the first evaporator B. According to this structure, the return air chamber 17 can be formed integrally with the inner container, so that the manufacturing cost and the manufacturing process can be reduced, and good heat exchange efficiency can be obtained as well.

In order to realize the function of ensuring the temperature control of the wide-range variable-temperature chamber under the condition of ensuring the freezing temperature of the first evaporator B: the refrigerator of the invention controls the temperature of the wide-range temperature-changing chamber to be opened and closed by

double baffles

14 and 15, and returns the return air of the wide-range temperature-changing chamber to the bottom of the first evaporator B, namely the position of the freezing return air inlet C by the return air cavity 17 at the back of the first evaporator B by the return air inlet C1 at the side part of the middle partition plate. Therefore, the whole refrigeration air path system is reasonably and effectively circulated, and the refrigeration effect of the wide temperature-variable chamber is achieved. In order to consider that the cold quantity requirements of the double baffles are different when the wide-width temperature-changing chambers are at different set values and to better control the chamber temperature, the opening and closing of the baffles of the double baffles at different environmental temperatures and at different set values of the wide-width temperature-changing chambers are controlled, so that the aim of uniformly distributing the wide-width temperature-changing chamber temperature under the conditions of various environmental temperatures and set values is better fulfilled.

< control method of refrigerator >

Fig. 5 is a flowchart of a control method of a refrigerator of the present invention. Fig. 6 is a flowchart of a control method of a refrigerator of the present invention.

As shown in fig. 5, the method for controlling the refrigerator according to the present invention includes: a determination step S11 of determining whether the current temperature in the compartment reaches a set temperature; a setting step S12, setting the opening and closing angle of each baffle according to the environment temperature and the set temperature; an opening step S13, wherein each baffle is opened according to the opening and closing angle of each baffle; and a closing step S14 of closing the respective shutters. When the determination result of the determination step S11 is no, the setting step S12 and the opening step S13 are performed; when the determination result of the determination step S11 is yes, a closing step S14 is performed. According to the control method of the refrigerator, the uniformity of the temperature in the compartment can be ensured.

As shown in fig. 6, the method for controlling a refrigerator according to the present invention further includes an opening/closing frequency determining step S15 of determining whether or not the closing time of each shutter reaches a time defined by the opening/closing frequency after the closing step S14, in which the opening/closing frequency of each shutter is set based on the ambient temperature and the set temperature in the setting step S12. When the determination result in the opening/closing frequency determination step S15 is "no", a determination step S11 is executed; if the determination result in the open/close frequency determination step S15 is yes, the opening step S13 is performed. Therefore, the opening and closing times of the

baffles

14 and 15 are not reduced even in the low load condition, so that the icing on the periphery of the baffles can be prevented, and an anti-freezing heater does not need to be added.

In the control method of the refrigerator according to the present invention, in the setting step S12, the ambient temperature and the set temperature are set to a plurality of segment regions, respectively, and the combination of the numerical values of the opening and closing angles of the shutters is set in accordance with the combination of different segment regions of the ambient temperature and the set temperature, respectively. Therefore, the combination of the opening and closing angles of the baffles can be set according to the combination of the environment temperature and the set temperature, and the uniformity of the indoor temperature can be further ensured. Table 1 shows a specific example of setting the opening and closing angle of the shutter. Wherein F1 denotes the 1 st shutter 14, and F2 denotes the 2 nd shutter 15. For example, F1 + 100% + F2 + 50% indicates that the 1 st shutter 14 is fully opened and the 2 nd shutter 15 is opened by 45 °.

[ Table 1]

As shown in table 1, when the ambient temperature is high and the set temperature is low, the double baffle plates are fully opened because it is necessary to introduce the cold air into the compartment as much as possible. As the ambient temperature becomes lower and the set temperature becomes higher, the opening angle and the total opening area of the double baffles also decrease. By storing the table in the memory, when the opening and closing of the baffle are controlled, the corresponding opening and closing angle can be quickly searched, so that the baffle can be quickly controlled. Table 1 shows examples of the opening and closing angles of 0%, 50%, and 100%, but it goes without saying that other opening and closing angles, for example, 30% and 60%, may be appropriately set.

In the method for controlling a refrigerator according to the present invention, it is preferable that the setting step S12 sets the ambient temperature and the set temperature to a plurality of segment regions, respectively, and the combination of the opening/closing frequency values of the shutters is set according to the combination of different segment regions of the ambient temperature and the set temperature, respectively. Thus, the baffle can be forcibly opened and closed at an optimum time, so that the periphery of the baffle can be effectively prevented from freezing, and an anti-freezing heater does not need to be added. Table 2 shows a specific example of setting the opening/closing frequency of the shutter. Wherein F1 denotes the 1 st baffle 14, and F2 denotes the 2 nd baffle 15. For example, F1 × 30+ F2 × 30 indicates that the 1 st shutter 14 is forcibly opened and closed at a frequency of 30 minutes/time, and the 2 nd shutter 15 is also forcibly opened and closed at a frequency of 30 minutes/time, and the determination control is required according to table 1 after the forcible opening.

[ Table 2]

In the examples of tables 1 and 2, if the ambient temperature is AT5 ℃ and the wide temperature-variable chamber is set to 4 ℃, according to this procedure, only the shutter 14 is opened, and the shutter 15 does not need to be opened, so that the temperature in the wide temperature-variable chamber can be ensured to be uniform. Further, the shutter 15 is forcibly opened and closed once after 20 minutes of closing, so that no ice is formed around the shutter 15. In addition, the phenomenon of condensation on the middle partition plate of the partition surface of the freezing compartment due to high humidity of the wide temperature-changing compartment can be avoided due to the long opening time of the baffle.

While the invention has been specifically described above in connection with the drawings and examples, it will be understood that the above description is not intended to limit the invention in any way. Those skilled in the art can make modifications and variations to the present invention as needed without departing from the true spirit and scope of the invention, and such modifications and variations are within the scope of the invention.

Claims

1. A refrigerator is characterized in that a refrigerator body is provided with a refrigerator door,

comprises a compartment, an evaporator, a fan, an air passage, and a baffle plate disposed in the air passage,

the chamber is a wide temperature-changing chamber with the temperature adjusting range of-25 to 10 ℃,

the cool air generated by the evaporator is introduced into the compartment through the air passage by the fan and returns to the evaporator,

at least 2 baffles are arranged in the air path, the at least 2 baffles enable the cold air to travel along the same path,

the at least 2 baffles set the respective opening and closing angle and opening and closing frequency according to the same environmental temperature and the same set temperature respectively,

the at least 2 baffles are a first baffle and a second baffle with a shielding area larger than that of the first baffle,

the first baffle and the second baffle are arranged in the air path side by side.

2. The refrigerator of claim 1,

the shielding area of the first baffle is 1/3-1/2 of the shielding area of the second baffle.

3. The refrigerator of claim 1,

when the time specified by the opening and closing frequency of each baffle is reached, each baffle is forcibly opened and closed once no matter whether the temperature in the chamber reaches the set temperature or not.

4. The refrigerator according to any one of claims 1 to 3,

the disclosed device is provided with:

a first chamber, the back of which is provided with a first evaporator;

a second compartment sharing the first evaporator with the first compartment,

the cold air generated by the first evaporator is introduced into the first compartment through the first air passage by the fan and returns to the first evaporator,

the cold air generated by the first evaporator is introduced into the second compartment through a second air passage by a fan and returns to the first evaporator,

at least 2 baffles are arranged in the second air passage,

the 2 baffles set the opening and closing angle and the opening and closing frequency respectively according to the environment temperature and the set temperature.

5. A control method of a refrigerator is characterized in that,

the refrigerator comprises a compartment, an evaporator, a fan, an air duct, and a baffle plate arranged in the air duct, wherein the compartment is a wide temperature-changing chamber with a temperature adjusting range of-25 to 10 ℃, cold air generated by the evaporator is guided into the compartment through the air duct by the fan and returns to the evaporator, at least 2 baffle plates are arranged in the air duct, and the cold air travels along the same path through the at least 2 baffle plates,

the control method comprises the following steps:

a judging step of judging whether the current temperature in the compartment reaches a set temperature;

setting, namely setting the opening and closing angle of each baffle according to the environment temperature and the set temperature;

an opening step of opening each baffle according to the opening and closing angle of each baffle; and

a closing step of closing each of the shutters,

when the determination result of the determining step is "no", executing the setting step and the opening step;

when the determination result of the determining step is "yes", the closing step is performed,

6. The control method of a refrigerator according to claim 5,

in the setting step, the opening and closing frequency of each baffle is further set according to the environment temperature and the set temperature,

the control method further comprises an opening/closing frequency determination step of determining whether or not the closing time of each shutter reaches a time specified by the opening/closing frequency after the closing step,

when the judgment result in the opening and closing frequency judging step is negative, executing the judging step;

and when the judgment result in the opening and closing frequency judging step is 'yes', executing the opening step.

7. The control method of a refrigerator according to claim 5 or 6,

in the setting step, the ambient temperature and the set temperature are set to a plurality of segment regions, respectively, and the combination of the numerical values of the opening and closing angles of the respective shutters is set in accordance with the combination of different segment regions of the ambient temperature and the set temperature, respectively.

8. The control method of a refrigerator according to claim 6,

in the setting step, the ambient temperature and the set temperature are set to a plurality of segment regions, respectively, and the combination of the numerical values of the opening and closing frequency of each shutter is set in accordance with the combination of different segment regions of the ambient temperature and the set temperature, respectively.