KR100323340B1 - Refrigerator - Google Patents

Abstract

The present invention provides a refrigerator having a switching chamber capable of switching a set temperature from a freezing temperature suitable for preservation of frozen foods to a temperature of a refrigeration temperature suitable for preserving normal foods. When the set temperature of the switching room is set higher than the current temperature in the refrigerator, the bottom heater 62 and the side heater 66 are operated. When the temperature sensor 60 of the switching room reaches a predetermined temperature, both heaters are turned on. It is characterized by stopping.

Description

Refrigerator {REFRIGERATOR}

The present invention relates to a refrigerator having a switching chamber capable of switching a set temperature from a freezing temperature to a temperature of a refrigeration temperature.

Conventional refrigerators only have a room for maintaining the temperature in the refrigerator at a specific temperature such as a refrigerator compartment, a freezer compartment, and a vegetable compartment. However, in recent refrigerators, in addition to this room, a switching room capable of converting the temperature in the refrigerator from the refrigeration temperature to the freezing temperature There is a thing provided.

In order to control the temperature in the refrigerator of the switching chamber to a set temperature, a damper dedicated to the switching chamber was provided and closed to block the inflow of cold air, thereby controlling temperature.

However, in the switching chamber described above, when the set temperature is switched, there is a problem that it takes time to reach the temperature. For example, in the case where the set temperature is changed from the freezing temperature to the refrigerating temperature, it took 5 hours or more to reach the refrigerating temperature.

In addition, when the ambient temperature (hereinafter, referred to as ambient temperature) where the refrigerator is placed is low, there is a problem that the set refrigeration temperature may not be reached when the set temperature is switched from the freezing temperature to the refrigeration temperature.

In view of the above problems, the present invention provides a refrigerator capable of rapidly reaching the switching chamber at a set temperature.

1 is a front view of a switching chamber.

2 is an exploded perspective view of the switching chamber.

3 is a front view of the refrigerator.

4 is a cross-sectional view taken along the line A-A in FIG.

Figure 5 is a longitudinal cross-sectional view of the interruption of the refrigerator showing one embodiment of the present invention.

6 is a block diagram of a refrigerator.

7 is a diagram showing a standard of a set temperature of the switching chamber.

8 is a table describing the heating stop temperature of the first control method when the set temperature is increased.

9 is a table describing the heating stop time in the second control method.

10 is a table describing the heating stop temperature in the third control method.

11 is a flowchart of a third control method.

12 is a table describing a heating stop time of a fourth control method.

13 is a flowchart of a fourth control method.

14 is a table describing the cooling stop temperature of the first control method when the temperature in the refrigerator is set low.

15 is a table describing a cooling stop time of a second control method when the temperature in the refrigerator is set low.

16 is a graph showing the relationship between the intensity of a heater and the ambient temperature;

Fig. 17 is a diagram showing a relationship with the strength of each heater when the set temperature is switched.

18 is a graph showing the relationship between the ambient temperature and the temperature in the refrigerator.

19 is a graph showing a relationship between temperature and time in a refrigerator.

* Explanation of symbols for the main parts of the drawings

10: refrigerator 18: switching room

32: damper device 62: bottom heater

66: side heater 68: aluminum tape

80: ambient temperature sensor

The refrigerator of the present invention is a refrigerator provided with a switching chamber capable of switching a set temperature from a freezing temperature suitable for preserving frozen food to a temperature of a refrigeration temperature suitable for preserving normal food, wherein a heating device is provided on the wall surface of the switching room. When the set temperature of the switching room is set higher than the current temperature in the refrigerator, first control means for operating the heating device is provided.

In addition, the refrigerator of the present invention is a refrigerator having a switching chamber capable of switching a set temperature from a freezing temperature to a temperature of a refrigerating temperature, wherein a heating device is provided on a wall surface of the switching chamber and the set temperature of the switching chamber is set in a current refrigerator. When the temperature is set higher than the temperature, the heating capacity of the heating device is controlled to be increased. When the set temperature is lower than the current refrigerator temperature, the first control means is provided to control the heating capacity of the heating device to be smaller. .

In the refrigerator of the present invention, when the set temperature of the switching chamber is set higher than the current temperature in the refrigerator, the first control means heats the interior of the switching chamber by operating the heating device, thereby quickly reaching the set temperature.

In the refrigerator of the present invention, the first control means controls the heating capacity of the heating device to be increased when the set temperature of the switching chamber is set higher than the current temperature in the refrigerator, so that the temperature in the refrigerator is a high set temperature for the purpose. Make it easy to climb. On the contrary, when the set temperature is set lower than the current temperature in the refrigerator, the heat capacity of the heating device is controlled to be small, so that the temperature in the refrigerator is easily lowered.

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 11.

First, the structure of the whole refrigerator 10 is demonstrated based on FIG. 3 is a front view of the refrigerator 10 of the present embodiment, FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 3, and FIG. 5 is a longitudinal cross-sectional view of a stop of the refrigerator 10.

The refrigerating chamber 14 is provided at the top of the cabinet 12 of the refrigerator 10, the ice making chamber 16 and the switching chamber 18 at the bottom thereof, the freezing chamber 20 at the bottom thereof, and the vegetable chamber 22 at the bottom thereof.

In addition, the refrigerating chamber 14 is provided with a hinged door 14a, and in the ice making chamber 16, the switching chamber 18, the freezing chamber 20 and the vegetable chamber 22, respectively, the drawer-type doors 16a and 18a. 20a and 22a are provided.

On the back surface of the ice-making chamber 16 and the freezing chamber 20, the cooling space 24 comprised from the cooler cover and the inner box of the cabinet 12 is provided. A cooler 26 is installed inside the cooling fan, and a cooling fan 28 is installed above the cooler 26, and a defrosting heater 30 is installed below the cooler 26.

As shown in FIG. 5, a damper device 32 is provided on the rear surface of the switching chamber 18 for sending cold air from the cooling fan 28 to the refrigerating chamber 14 and the switching chamber 18. On the left side of the damper device 32, an inlet 34 of cold air from the cooling fan 28 is installed, and a duct 36 for sending cold air to the refrigerating chamber 14 is installed on the upper surface thereof, An outlet 38 for sending cold air to 18 is provided. Moreover, the damper device 32 and the refrigerator compartment damper 42 for sending cold air to the refrigerator compartment 14 and the switching chamber 18 are provided in the damper apparatus 32, respectively.

4, the machine room 44 is provided in the back surface of the vegetable chamber 22, and the compressor 46 is provided in the inside.

Next, the structure of the switching chamber 18 is demonstrated based on FIG. 1 and FIG.

The switching chamber 18 includes a cabinet 55 constituting the ceiling surface 48, the left surface 50, the right surface 52, and the bottom surface 54 of the cabinet 12 at the position of the damper device 32. It consists of a structure fitted to the inner box 13 and the back plate 56 is installed between the box 55 and the damper device (32). The back plate 56 is formed of the back surface of the switching chamber 18. In addition, the frame 57 is attached to the front surface of the box 55. In addition, the damper device 32 consists of the cover 32a and the main body 32b.

An opening 58, which is a jet of cold air, is opened in the back plate 56, and this position corresponds to the position of the jet 38 of the damper device 32. In addition, a switching chamber temperature sensor 60 for detecting the temperature in the refrigerator of the switching chamber 18 is provided on the right side of the opening 58.

The box 55 is provided with a heat insulating material made of expanded styrene or the like around the box 55. Moreover, the bottom surface heater 62 which consists of a heating wire is provided in the back surface of the bottom surface 54, and the said bottom surface heater 62 is covered with the aluminum tape 64. As shown in FIG. In addition, a side heater 66 made of a heating wire is provided on the rear surface of the left side 50, and the aluminum tape 68 covers the side heater 66. In addition, the aluminum tape 68 extends to the position of the back plate 56 as shown in FIG. 1, and the heat of the side heater 66 is made of synthetic resin through the aluminum 68. It is made to pass on. Thereby, it can also heat from the back surface, without providing a heater in particular in the back plate 56. Therefore, the said switching chamber 18 is heated from three sides of a bottom face, a left face, and a back face, and can maintain the temperature in a refrigerator stably.

The bottom heater 62 uses a larger maximum heat capacity so that the heating amount can be larger than that of the side heater 66. This is because the bottom heater 62 aims to raise the temperature of the switching chamber 18.

Next, the structure of the electric system of the said refrigerator is demonstrated based on FIG.

The control device 70 which consists of a microcomputer is provided in the board | substrate of the upper back side of the refrigerating chamber 14, as shown in FIG. The damper motor for operating the motor driving device 74 for controlling the motor 72 for rotating the cooling fan 28, the damper 42 for the refrigerating chamber, and the damper 40 for the switching chamber. 76, the temperature sensor 60 for the switching chamber, the side heater 66 of the switching chamber 18, the bottom heater 62 of the switching chamber 18, the defrosting heater 30, and the compressor 46 are connected. It is. In addition, an ambient temperature sensor 80 for detecting the ambient temperature of the refrigerator 10 is connected, and an operation panel 82 for operating the set temperature of each room is connected.

In the operation panel 82, the temperature of the switching chamber 18 can be continuously switched between the temperature ranges of the vegetable chamber temperature, the refrigerating chamber temperature, the chilled temperature, and the partial temperature, and also the freezing temperature (weak, normal, steel). It is possible to switch continuously between temperature ranges. In addition, the target temperature of the refrigerator compartment temperature, the vegetable compartment temperature, the chilled temperature, the partial temperature, and the freezing temperature (weak, normal, steel) is as shown in FIG.

Next, the first embodiment will be described with respect to the case where the set temperature of the switching chamber 18 of the refrigerator 10 of the present invention is switched.

1. Control when the set temperature of the switching room 18 is set higher than the current temperature in the refrigerator

There are four control methods in the case where the set temperature of the switching chamber 18 is set higher than the current temperature in the refrigerator, and each control method will be described in turn.

(1) first control method

A first control method will be described based on the table in FIG. In the above table, the vertical column indicates the temperature in the refrigerator before switching, and the horizontal column indicates the set temperature, and the numerals therein indicate that the bottom heater 62 and the side heater 66 which are detected by the switching chamber temperature sensor 60 stop heating. The temperature is shown. The above contents are stored in the memory of the control device 70.

The contents of the first control method are that when the set temperature of the switching chamber 18 is set higher than the current temperature in the refrigerator, the bottom heater 62 and the side heater 66 are operated and the inside of the switching chamber 18 is forcibly heated. To quickly reach the set temperature. And when the temperature which the switch chamber temperature sensor 60 detected as the timing which stops the said bottom heater 62 and the side heater 66 reaches | attained the heating stop temperature, it stops.

For example, as shown in FIG. 8, when the present refrigerator temperature is the freezing temperature and the set temperature is the refrigeration temperature, the bottom heater 62 and the side heater 66 are operated and the inside of the refrigerator is forcibly moved. It heats and stops when the temperature which the switching chamber temperature sensor 60 detected reached the heating stop temperature 6 ??.

As a result, the temperature inside the refrigerator rises to an early set temperature and the inside of the switching chamber 18 is not heated more than necessary.

(2) second control method

The second control method will be described based on the table in FIG. 9. 9 shows a heating stop time for stopping the heater 62 and the side heater 66 when the vertical column indicates the current temperature in the refrigerator and the horizontal column indicates the set temperature. This content is also stored in the memory of the control device 70.

The second control method operates the bottom heater 62 and the side heater 66 when the set temperature of the switching chamber 18 is set higher than the current refrigerator temperature and stops the heater after a predetermined heating stop time.

For example, when the present refrigerator temperature is the freezing temperature and the set temperature is the refrigerating temperature, the bottom heater 62 and the side heater 66 are stopped after 30 minutes of the heating stop time.

Thereby, while the temperature in the refrigerator of the switching chamber 18 rises more quickly to a preset temperature, the temperature in the refrigerator does not rise more than necessary.

(3) third control method

A third control method will be described based on the table in FIG. 10 and the flowchart in FIG. 11.

The third control method is a further improvement to the first control method, and the heating stop temperature in the first control method is changed in accordance with the ambient temperature. FIG. 10 shows that the vertical column represents the ambient temperature and the horizontal column represents the switching state of the set temperature, and the numerals in the column represent the heating stop temperature for stopping the bottom heater 62 and the side heater 66. The above contents are stored in the memory of the control device 70.

The control method will be described based on the flowchart in FIG.

In step 1, the operating panel 82 switches the set temperature.

In step 2, the ambient temperature is detected by the ambient temperature sensor 80.

In step 3, the ambient temperature is 30 ?? Judge whether it is abnormal, 30 ?? If above, the process proceeds to step 4; otherwise, the process proceeds to step 5.

Ambient temperature 30 in step 4 ?? The above heating stop temperature is called out from the memory. Here, A represents a heating stop temperature when switching from the freezing temperature to refrigeration temperature, B represents a heating stop temperature when switching from the freezing temperature to the vegetable compartment temperature, and C represents heating when switching from the refrigeration temperature to the vegetable compartment temperature. The stop temperature is shown. In addition, A, B, and C are also the same in the following steps. Then, the process proceeds to step 8.

In step 5, it is determined whether or not the ambient temperature is 10 ?? to 30 ??, and if so, the process proceeds to step 6. If it is below, it progresses to step 7.

In step 6, the heating stop temperature is A = 7 ??, B = 9 ??, C = 8 ??, and the procedure proceeds to step 8.

In step 7, the ambient temperature is 10 ?? Since the heating stop temperature is A = 8 ??, B = 10 ??, C = 9 ??, the process proceeds to Step 8.

In the case where the set temperature switched in step 1 in step 8 is the refrigeration temperature from the freezing temperature, the process proceeds to step 9; otherwise, the process proceeds to step 10.

As the set temperature is switched in step 9, the process proceeds to step 15 by substituting the value A, i.e., 6 ??, into the temperature to be the heating stop temperature (hereinafter referred to as the corresponding stop temperature X).

In step 10, if it is switched from the freezing temperature to the vegetable temperature, the process proceeds to step 11; otherwise, the process proceeds to step 12.

In step 11, the value B is substituted into the corresponding stop temperature X, and the procedure proceeds to step 15.

In step 12, if it is switched from the refrigeration temperature to the vegetable room temperature, the process proceeds to step 13; otherwise, the process ends in step 14.

In step 13, the value C is substituted for the corresponding stop temperature, and the process proceeds to step 15.

In step 15, the bottom heater 62 and the side heater 66 are operated to proceed to step 16.

In step 16, the measurement temperature Y detected by the switching room temperature sensor 60 is read out, and it progresses to step 17.

In step 17, the measured temperature Y is compared with the corresponding stop temperature X, and if the measured temperature does not reach the corresponding stop temperature X, the process returns to step 16, and if so, the process proceeds to step 18.

Since the temperature in the refrigerator of the switching chamber 18 reached the set temperature in step 18, the bottom surface heater 62 and the side heater 66 are stopped.

By performing the above control, since the temperature in the refrigerator of the switching chamber 18 is stopped according to ambient temperature, the temperature in the refrigerator of the switching chamber 18 is not heated more than necessary, and it can be made to reach a preset temperature more quickly.

(4) fourth control method

A fourth control method will be described based on the table in FIG. 12 and the flowchart in FIG. 13.

The fourth control method is an improvement of the second control method and changes the heating stop time in accordance with the ambient temperature. 12 shows the above-mentioned heating stop time, which is stored in the memory of the control device 70.

Hereinafter, this fourth control method will be described based on the flowchart in FIG. 13.

In step 1, the operating panel 82 switches the set temperature.

In step 2, the ambient temperature is detected by the ambient temperature sensor 80.

In step 3, the ambient temperature detected in step 2 is 30 ?? If above, the process proceeds to step 4, otherwise, the process proceeds to step 5.

In step 4, the heating stop temperature is retrieved from the memory. Subsequently, A is substituted with a heating stop time of 30 minutes when switching from the freezing temperature to the refrigeration temperature, B is substituted with a heating stop time of 35 minutes when the switching from the freezing temperature to the vegetable temperature, and C is a vegetable from the refrigeration temperature. Substitute 15 minutes of heating stop time in the case of switching to temperature. In addition, A to C in the following steps are also the same. The process then advances to step 8.

In step 5, if the ambient temperature is 10 ?? to 30 ??, the process proceeds to step 6, where 10 ?? If it is below, it progresses to step 7.

In step 6, since the ambient temperature is 10 ?? to 30 ??, A = 25 ??, B = 30 ??, and C = 12 ??

In step 7, the ambient temperature is 10 ?? In the table 4, A = 20 ??, B = 25 ??, and C = 10 ??

In step 8, when it is switched from the freezing temperature to the refrigerating temperature, the process proceeds to step 9; otherwise, the process proceeds to step 10.

In step 9, the value A is substituted into the time to be actually the heating stop time (hereinafter referred to as the corresponding stop time X) in accordance with the change of the set temperature, and the procedure proceeds to step 15.

In step 10, if it is switched from the freezing temperature to the vegetable chamber temperature, the process proceeds to step 11; otherwise, the process proceeds to step 12.

In step 11, the value of B is substituted in the corresponding stop time X, and the flow advances to step 15.

In step 12, if it is switched from the refrigerator compartment temperature to the vegetable compartment temperature, the process proceeds to step 13; otherwise, the process proceeds to step 14 and ends.

In step 13, the value C is substituted for the corresponding stop time X, and the routine advances to step 15.

In step 15, the bottom heater 62 and the side heater 66 are operated to proceed to step 16.

In step 16, a timer provided in the control device 70, which is a microcomputer, is started.

In step 17, the measurement time Y is measured with a timer.

In step 18, the measurement time (Y) of the timer is compared with the corresponding stop time (X), and if the measurement time (Y) has not reached the corresponding stop time (X), the process returns to step 17, and if it reaches the step 19 Proceed to

In step 19, the bottom heater 62 and the side heater 66 are stopped and finished.

In this control method, the set temperature can be reached faster and the heating stop time is changed in accordance with the ambient temperature. Therefore, the temperature in the refrigerator of the switching chamber 18 is too low or too high. none.

2. When the set temperature of the changeover room 18 is set lower than the current temperature in the refrigerator

Control of

There are four types of control methods in the case where the set temperature of the switching room 18 is set lower than the current temperature in the refrigerator.

(1) first control method

The first control method will be described based on the table in FIG. 14.

The first control method forcibly operates the compressor 46 when the set temperature is switched, simultaneously opens the damper 40 for the switching chamber of the damper device 32, forcibly sends cold air, and It is lowering the temperature in the refrigerator. And stop of the said compressor 46 is made to respond | correspond according to the temperature in the refrigerator of the switching chamber 18, and it stops. Fig. 14 shows the cooling stop temperature which is the temperature to be stopped. For example, when switching from the refrigeration temperature to the freezing temperature, the cooling stop temperature is -28 ° and the compressor 46 is reached when the temperature is reached. To stop. In addition, while the compressor 46 is forcibly operated, the damper for sending cold air to another room, such as a refrigerating chamber damper, other than the switching chamber damper 40, is forcibly closed. By doing in this way, another room is not cooled more than necessary.

In this control method, since the cold air is forcibly sent, the temperature inside the refrigerator of the switching chamber 18 is not lowered more than necessary while reaching the set temperature more quickly.

(2) second control method

The second control method will be described based on the table in FIG. 15.

The second control method forcibly operates the compressor 46 similarly to the first control method, and stops the stop timing after a predetermined time (hereinafter referred to as a cooling stop temperature). 15 shows the cooling stop temperature. For example, when switching from the refrigeration temperature to the freezing temperature, the compressor 46 is stopped after 60 minutes.

Also in the said control method, while the temperature in the refrigerator of the switching chamber 18 reaches | attains a preset temperature faster, the temperature in a refrigerator does not fall more than necessary.

(3) third control method

The third control method is an improvement of the first control method, and another point is to change the cooling stop temperature in accordance with the ambient temperature. For example, the lower the ambient temperature, the higher the cooling stop temperature.

According to the above control method, even when the ambient temperature is low, the temperature in the refrigerator is not lowered more than necessary.

(4) fourth control method

The fourth control method is an improvement of the second control method and changes the cooling stop temperature in accordance with the ambient temperature. For example, when the ambient temperature is low, the time (cooling stop time) for operating the compressor 46 is shortened, and the temperature in the refrigerator of the switching chamber 18 is not lowered more than necessary.

In the above-described refrigerator according to the first embodiment of the present invention, when the set temperature of the switching chamber is set higher than the current temperature in the refrigerator, the heating device is operated to forcibly raise the temperature inside the switching chamber, so that Can be reached.

In addition, when the set temperature of the switching room is set lower than the current temperature in the refrigerator, the second control means forcibly operates the compressor to send cold air, thereby reaching the set temperature quickly.

Next, as a second embodiment of the refrigerator 10 of the present invention, a case in which the temperature in the refrigerator of the switching chamber 18 is controlled using the bottom heater 62 and the side heater 66 will be described.

There are two control methods as shown below, which will be described in turn below.

(1) first temperature control

The first temperature control is to control the bottom heater 62 and the side heater 66 according to the ambient temperature at which the refrigerator 10 is placed. This will be described based on FIG. 16. Fig. 16 shows the relationship between the strength of the heater and the ambient temperature, with the vertical axis representing the strength of the heater and the horizontal axis representing the ambient temperature.

When the ambient temperature is low, the temperature in the refrigerator of the switching chamber 18 also decreases. Therefore, when the ambient temperature is T1 (e.g. 15 ??) or less, the strength of the heater is "strong", and when T1 is T 2 (e.g. 30 ??), the strength of the heater is "medium" and T1 At the above ambient temperature, the strength of the heater is set to "about" or OFF.

(2) second temperature control

In the second temperature control, the bottom heater 62 and the side heater 66 are controlled based on the case where the set temperature is switched. This will be described based on FIG. 17. FIG. 17 shows the strengths of the bottom heater 62 and the side heater 66 when the set temperature is changed from the freezing temperature to the refrigerating temperature or the freezing temperature to the freezing temperature.

When switching from the freezing temperature to the refrigerating temperature, the heater is operated at a strength higher than normal (H). On the contrary, when switching from the refrigeration temperature to the freezing temperature, the operation is made to be lower than the normal strength (L) or turned off.

(3) Effect by the two temperature control

Effects of the two temperature controls will be described based on FIGS. 18 and 19.

FIG. 18 shows the relationship between the temperature in the refrigerator of the switching chamber 18 and the ambient temperature. The solid line is the case where the present control is performed and the dotted line is the case where the present control is not performed.

Fig. 19 shows the relationship between the temperature in the refrigerator of the switching chamber 18 and the time, and shows a case where the setting is switched from the freezing temperature to the refrigeration temperature at 0 hours, and the solid line performs this control and the dotted line shows the control. It is a conventional case which is not implemented.

As shown in FIG. 18, in the conventional case, when the ambient temperature is low (15 ??), even if the set temperature is set to the refrigeration temperature (3 ??), the temperature in the refrigerator reaches only 0 ?? The temperature cannot be reached. On the other hand, in the case of this control, even if the ambient temperature is 15 ??, the set temperature can reach 3 ??. In the conventional case, when the ambient temperature is changed from 15 ° to 30 °, the temperature in the refrigerator tends to increase according to the ambient temperature. However, in the present control, the temperature in the refrigerator is constant at 3 °. This is because the inside of the switching chamber 18 is heated in accordance with the ambient temperature by the first temperature control, so that the temperature is not affected by the ambient temperature.

Next, as shown in Fig. 19, in the case of this control, it takes about 5 hours in the conventional case, compared to reaching the refrigeration temperature 3 ?? for about 3 hours. In other words, when the present control is performed, it is possible to reach the desired refrigeration temperature quickly. This is because, when the set temperature of the switching chamber 18 is set higher than the current temperature in the refrigerator by the second temperature control, the heat capacity of the heaters 62 and 66 is increased to forcibly heat the inside of the refrigerator. . In the opposite case, the heat capacity of the heaters 62 and 66 is reduced or turned off.

In the refrigerator according to the second embodiment of the present invention described above, when the set temperature of the switching chamber is set higher than the current temperature in the refrigerator, the heat capacity of the heating device is increased, and the heat capacity of the heating device is reduced. To reach the desired set temperature.

Moreover, since the 2nd control means which controls so that the heat capacity of a heating apparatus is enlarged so that an ambient temperature is low is provided, even if setting temperature is set from refrigeration temperature to refrigeration temperature in the case of low ambient temperature, it will ensure that it reaches a refrigerator temperature. can do.

As described above, according to the present invention, even when the set temperature of the switching room is set higher than the current temperature in the refrigerator and when the ambient temperature is low, the temperature of the switching room can be reached quickly.

Claims (11)

In the refrigerator provided with the switching room which can switch a set temperature from the freezing temperature to the temperature of a refrigeration temperature, A heating device installed on the wall surface of the switching room, a switching room temperature sensor for detecting a temperature in the refrigerator installed in the switching room, an ambient temperature detection sensor for detecting an ambient temperature of the refrigerator, and a set temperature of the switching room in the current refrigerator. When the temperature is higher than the internal temperature, the first control means for operating the heating device is provided. The first control means stops the heating device when the temperature measured by the switching chamber temperature sensor reaches a predetermined heating stop temperature after operating the heating device, and at the same time, the ambient temperature measured by the ambient temperature sensor. The lower the refrigerator, characterized in that to increase the heating stop temperature. The method of claim 1, The first control means, A refrigerator characterized in that the heating device is stopped after a predetermined heating stop time after the heating device is operated; The method of claim 2, It is provided with a temperature sensor for detecting the ambient temperature of the refrigerator, The first control means, The heating stop time is shortened as the ambient temperature measured by the ambient temperature sensor is lowered. In the refrigerator provided with the refrigerating cycle which consists of a compressor, a cooler, etc., and which can switch a set temperature from the freezing temperature suitable for the storage of frozen foods to the refrigeration temperature suitable for the storage of normal foods, The compressor is forcibly operated when the switching chamber temperature sensor for detecting the temperature in the refrigerator of the switching chamber, the ambient temperature sensor for detecting the ambient temperature of the refrigerator, and the set temperature of the switching chamber are set lower than the current temperature in the refrigerator. To install a second control means for The second control means stops the compressor when the temperature measured by the switching chamber temperature sensor reaches a predetermined cooling stop temperature after operating the compressor, and as the ambient temperature measured by the ambient temperature sensor decreases, A refrigerator, characterized in that to increase the cooling stop temperature. The method of claim 4, wherein The second control means, And after operating the compressor, stopping the compressor after a predetermined cooling stop time. The method of claim 5, Install a temperature sensor for detecting the ambient temperature of the refrigerator, The second control means, And as the ambient temperature measured by the ambient temperature sensor decreases, the cooling stop time is shortened. The method of claim 4, wherein The second control means And a damper provided between the storage chambers other than the switching chamber and the cooling space with the cooler in a closed state when the compressor is forcibly operated. In the refrigerator provided with the switching room which can switch a set temperature from the freezing temperature to the temperature of a refrigeration temperature, Install a heating device on the wall surface of the switching room, When the set temperature of the switching room is set higher than the current temperature in the refrigerator, the heating capacity of the heating device is controlled to be increased, and when the set temperature is set lower than the current refrigerator temperature, the heat capacity of the heating device is reduced. And a first control means for controlling it to be controlled. The method of claim 8, A heating device is separately installed on a wall surface different from the wall surface of the switching chamber, And a maximum heat capacity of said plurality of heating devices is different. The method of claim 8, And heat is transferred from the heating apparatus provided on the wall surface other than the rear surface of the switching chamber to the rear surface through a heat transfer member. The method of claim 8, Install a temperature sensor for detecting the ambient temperature of the refrigerator, And a second control means for controlling the heat capacity of the heating device to be smaller as the ambient temperature detected by the temperature sensor is higher.