JP2001041638A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the defrosting of respective evaporators without employing any defrosting heater by defrosting the evaporator for a freezing chamber utilizing the heat of refrigerating chamber in refrigerating mode. SOLUTION: A cabinet 12 of a refrigerator 10 is provided with a refrigerating chamber (R chamber) 14 as well as a vegetable chamber (V chamber) 16 in the upper refrigerating space of the same while the refrigerator 10 is provided with a freezing chamber (F chamber) 18 in the lower refrigerating space of the same. In an upper cooling space 26 an evaporator (R evaporator) 20 for the refrigerating chamber is provided. The freezing chamber 18 is provided with an evaporator for freezing chamber (F evaporator) 30 in a cooling space 28 below the back surface of the F chamber 18. A fan 32 for the freezing chamber is provided above the F evaporator 30. When defrosting of the F evaporator 30 is required under R mode, the F fan 32 is operated. Then, a F damper 34 is closed. Under this condition, air in the V chamber, whose temperature is higher than 0 deg.C, is sent into the lower cooling space 28 whereby the defrosting of the F evaporator 30 can be effected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having two evaporators.

[0002]

2. Description of the Related Art A refrigerator having a freezer compartment and a refrigerator compartment usually has one evaporator, and the air cooled by the evaporator is distributed to the freezer compartment or the refrigerator compartment by a fan to cool each compartment. Fan-cooled refrigerators that have been used are common. That is, the refrigerating compartment and the freezing compartment are simultaneously cooled, and when the refrigerating compartment reaches a certain temperature, the cold air flow control damper of the refrigerating compartment is closed to cool only the freezing compartment. Then, when the freezing room also reaches a certain temperature, the compressor stops.

[0003] In such a refrigerator, the temperature of the evaporator during operation is usually kept at a low temperature of -20 ° C or lower in order to cool the freezer compartment. Therefore, the humidity of the air in the freezer compartment and the humidity of the air in the refrigerator compartment reach this evaporator and adhere as frost, causing deterioration of the cooling performance. , The evaporator is being defrosted.

[0004]

However, in the above-described refrigerator, when the defrosting of the evaporator is performed, the defrost heater is used, so that the electricity cost becomes high and while the defrosting is being performed. Can not cool the inside of the refrigerator, the temperature in the refrigerator rises,
There has been a problem that the temperature of the food also rises, which adversely affects the storage performance of the food.

[0005] The above-mentioned problems are caused by a refrigerator having an evaporator dedicated to a refrigerator and an evaporator dedicated to a freezer.
When defrosting is performed, the same problem occurs because the defrost heater is heated to perform defrosting.

In view of the above problems, the present invention provides a refrigerator having two evaporators, in which each of the evaporators can be defrosted without using a defrost heater.

[0007]

According to a first aspect of the present invention, there is provided a refrigerator having a refrigerator, a refrigerator evaporator, a freezer, and a freezer evaporator. In a refrigerator that alternates between a refrigeration mode in which the refrigerator is cooled to a refrigerator temperature to cool the refrigerator and a freezing mode in which the evaporator for the freezer is cooled to the temperature of the freezer and the refrigerator is cooled, the heat in the refrigerator is reduced in the refrigerator mode. Utilization is used to defrost the freezer evaporator.

A refrigerator according to a second aspect of the present invention is the refrigerator according to the first aspect, wherein a duct is provided to connect the space in which the refrigerator and the freezer evaporator are housed, and the air in the refrigerator is evaporated using the duct. To defrost the freezer evaporator.

A refrigerator according to a third aspect of the present invention is the refrigerator according to the first aspect, wherein a heat pipe is provided for connecting a space in which the refrigerator and the evaporator for the freezer are housed, and the heat in the refrigerator is used to heat the freezer. It is sent to the evaporator for freezing to defrost the evaporator for the freezer compartment.

According to a fourth aspect of the present invention, in the refrigerator of the first aspect, when the evaporator for the freezer compartment is defrosted, the refrigerant inside the evaporator for the freezer compartment is removed to reduce the heat load for defrosting. Things.

A refrigerator according to a fifth aspect of the present invention has a refrigerator, a first evaporator, a freezer, and a second evaporator, and cools the refrigerator by lowering the temperature of the first evaporator to the temperature of the refrigerator. (1) a refrigeration mode, a second refrigeration mode in which the second evaporator is lowered to the temperature of the refrigerator to cool the refrigerator, a first refrigeration mode in which the first evaporator is lowered to the temperature of the refrigerator, and the refrigerator is cooled. (2) In the second freezing mode in which the evaporator is cooled down to the freezing room temperature to cool the freezing room, and in the first freezing mode, defrosting of the second evaporator is performed by utilizing heat of air in the cold room. .

A refrigerator according to claim 6 is the refrigerator according to claim 5, wherein a space accommodating the first evaporator, a first duct connecting the freezing room, a space accommodating the second evaporator, and a refrigerator room. And a second duct for connecting the air in the first evaporator to the freezer to cool the freezer in the first freezing mode, and to use the second duct to cool the freezer. Is sent to the second evaporator to defrost the second evaporator.

According to a seventh aspect of the present invention, the refrigerator is connected in series with the first evaporator and the second evaporator to change a flowing direction of the refrigerant.
The first freezing mode and the second refrigeration mode are simultaneously performed by flowing a refrigerant from the first evaporator to the second evaporator by the four-way valve, and the first evaporator is connected to the first evaporator by the four-way valve.
By flowing the refrigerant through the evaporator, the second refrigeration mode and the first
The refrigeration mode is performed simultaneously.

In the refrigerator according to the present invention, the refrigerant is a flammable refrigerant.

In the refrigerator of the first aspect, in the refrigeration mode, the evaporator for the freezer compartment can be defrosted by utilizing the heat of the air in the refrigerator compartment.

In the refrigerator according to the second aspect of the present invention, air in the refrigerator compartment is sent to the refrigerator evaporator by using a duct that connects the space in which the refrigerator compartment and the freezer compartment evaporator are stored, and the defrosting of the freezer compartment evaporator is performed. I do.

According to a third aspect of the present invention, there is provided a refrigerator having a heat pipe connecting a space in which a refrigerator compartment and a freezer compartment evaporator are accommodated, and using the heat pipe to send heat of the refrigerator compartment to the freezer compartment evaporator. Defrost the evaporator.

In the refrigerator according to the present invention, when the evaporator for the freezer compartment is defrosted, the refrigerant inside the evaporator for the freezer compartment is removed, and the heat load for defrosting is reduced by the amount of the refrigerant to remove the defrost. Makes it easier to frost.

The refrigerator according to claim 5 operates as follows.

In the first refrigerating mode, the temperature of the first evaporator is lowered to the temperature of the refrigerating compartment to cool the refrigerating compartment.

In the second refrigerating mode, the temperature of the second evaporator is lowered to the refrigerating room temperature to cool the refrigerating room.

In the first freezing mode, the temperature of the first evaporator is lowered to the freezing room temperature to cool the freezing room. In the first refrigeration mode, the heat of the air in the refrigerator compartment is
Defrost the evaporator.

In the second freezing mode, the temperature of the second evaporator is lowered to the freezing room temperature to cool the freezing room.

According to the refrigerator of the sixth aspect, in the first freezing mode, the air of the first evaporator is sent to the freezing room by using the first duct to cool the freezing room, and the second duct is used to cool the freezing room. The air in the refrigerator compartment is sent to the second evaporator to defrost the second evaporator.

According to the refrigerator of the present invention, the refrigerant flows from the first evaporator to the second evaporator by the four-way valve,
The first refrigerating mode and the second refrigerating mode are performed simultaneously, and the refrigerant is flowed from the second evaporator to the first evaporator by the four-way valve, whereby the second refrigerating mode and the first refrigerating mode can be performed simultaneously.

In the refrigerator according to the eighth aspect, since a defrost heater is not used, an environmentally friendly combustible refrigerant can be used.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in order.

(First Embodiment) A refrigerator 10 according to a first embodiment of the present invention will be described with reference to FIGS.

FIG. 1A is a longitudinal sectional view on the left side of the refrigerator 10, FIG. 1B is a longitudinal sectional view on the front side, and FIG. 1C is a longitudinal sectional view on the right side of the refrigerator 10.

FIG. 2 is an explanatory diagram of the refrigeration cycle of the refrigerator 10.

As shown in FIG. 1, a cabinet 12 of the refrigerator 10 is vertically insulated and vertically partitioned, and a refrigerator room (hereinafter referred to as an R room) 14 and a vegetable room (hereinafter referred to as a V A freezing room (hereinafter, referred to as an F room) 18 is provided in the lower freezing space. Note that the F chamber 18 is partitioned in the vertical direction.

An upper cooling space 26 is provided at the back of the R chamber 14 and is a space separated from the R chamber 14. A refrigerating room evaporator (hereinafter, referred to as R-eva) 20 is provided inside the upper cooling space 26, and a refrigerating room fan (hereinafter, referred to as R-fan) 22 is provided above the R-eva 20. I have.

At the front of the R fan 22, a damper (hereinafter referred to as R damper) 24 for controlling the cooling air blow from the R evaporator 20 to the R chamber 14 is provided.

A lower cooling space 28 is provided at the back of the F chamber 18 and is separated from the F chamber 18. In the lower cooling space 28, a freezer evaporator (hereinafter referred to as F-eva) 3
0 is provided. Above the Feva 30, a freezer fan (hereinafter, referred to as an Ffan) 32 is provided. In front of the F fan 32, the F chamber 30 and the F chamber 18
A damper (hereinafter, referred to as an F damper) 34 for controlling the cooling air blow to the air is provided.

A machine room is arranged behind the bottom surface of the F room 18, and an inverter-controlled compressor 36 is arranged.

The inside of the right side wall of the cabinet 12 has V
Duct 3 for F-eva defrost connecting chamber 16 and lower cooling space 28
8 are provided. An R defrost damper 52 is provided at an outlet on the lower cooling space 28 side of the F-eva defrost duct 38.

Inside the left side wall of the cabinet 12, the R cooling duct 4 connecting the lower cooling space 28 and the R chamber 14 is provided.
0 is provided. An F cooling damper 54 is provided at an entrance of the R cooling duct 40 on the lower cooling space 28 side.

Next, a refrigerating cycle of the refrigerator 10 will be described with reference to FIG.

A condenser 42 is connected to the downstream side of the refrigerant of the compressor 36, a first capillary tube 44 is connected to the downstream side of the condenser 42, and a first valve 46 is connected in parallel to the downstream side of the first capillary tube 44. And the second valve 4
8 are provided.

The R-eva 20 is connected to the downstream side of the first valve 46, and the F-eva 30 is connected to the downstream side of the R-eva 20. Further, the Feva 30 is connected to the compressor 36. On the other hand, a second capillary tube 50 is connected to the downstream side of the second valve 48, and the second capillary tube 50 is connected to the Feva 30.

The operation state of the refrigerator 10 having the above configuration will be described in order.

1. In the R mode refrigeration cycle, the first valve 46 is opened and the second valve 48 is opened.
Is closed, the refrigerant flows to the R-eva 20 and the F-eva 30.

In this case, when the R damper 24 is opened and the R fan 22 is rotated, the air cooled by the R evaporator 20 flows into the R chamber 14 and the V chamber 16, and the respective rooms are cooled. Then, the F fan 32 is stopped.

This state is called an R mode.

2. F mode When the internal temperature of the R chamber 14 decreases to a certain temperature, the first valve 46 is closed and the second valve 48 is opened. And F fan 32
When the F damper 34 is opened, the air cooled by the F-evaporator 30 is cooled by the F-fan 32 into the F-chamber 18.
And the F chamber 18 is cooled.

This state is called an F mode.

3. Defrosting in the R Mode In the R mode, the amount of frost on the F-eva 30 is detected, and when it is determined that defrosting is necessary, the air flow of the R fan 22 is reduced and the frequency of the compressor 36 is reduced. Then, the amount of the refrigerant to be sent is reduced, and the F fan 32 is operated. And
The damper 52 for F-eva defrosting and the damper 54 for R-cooling are opened, and the F damper 34 is closed. In addition, R damper 2
4 is left open.

In this state, the air in the V chamber 16 at a temperature of 0 ° C. or higher is sent to the lower cooling space 28 through the F defrost duct 38, and the air can be used to defrost the F evacuator 30. On the other hand, even if the air volume of the R fan 22 is reduced and the frequency of the
The air cooled to about −20 ° C. by the F-evaporator 30 flows into the R chamber 14 through the R cooling duct 40,
Can be cooled. Thus, the defrosting of the F-eva 30 can be performed efficiently, and the cooling effect of the R chamber 14 can be obtained.

4. Defrosting in the F Mode In the F mode, since the refrigerant does not flow through the R evaporator 20, when the R fan 22 is rotated and the R damper 24 is opened, the air inside the R chamber 14 and the V chamber 16 (3 By circulating (° C.), the temperature of the R-eva 20 can be increased, and the R-eva can be defrosted. Damper 5
2, 54 are closed.

5. Effects of the present embodiment In the R mode, the temperature of the R-eva 20 is −3 ° C. to 0 ° C.
, The amount of frost can be reduced.

In the F mode, the F-Eva 30 is -20.
Although the temperature is cooled down to ° C., heat exchange with the air in the F chamber 18 can greatly reduce the amount of frost.

It is not necessary to use a heater for defrosting the R-eva 20 and the F-eva 30, and the electricity bill can be reduced.

During the defrosting of the fuel evaporator 30, the cool air in the lower cooling space 28 can flow to the R chamber 14 to cool the R chamber, so that the compressor 36 and the R fan 22 can be cooled in the R mode.
Output can be reduced, saving energy.

As described above, since the defrost heater is not required, the rise in the temperature of the F chamber 18 can be suppressed,
Food preservability is improved.

Since no defrost heater, that is, an electric heater such as a glass tube heater is used, an environmentally friendly combustible refrigerant can be used.

(Second Embodiment) A refrigerator 10 according to a second embodiment of the present invention will be described with reference to FIG.

The refrigerator 10 shown in FIG. 3 is a specific example of the refrigerator 10 according to the first embodiment.

That is, the R-eva 20 is divided into two, one R-eva 20a is provided on the ceiling surface of the R chamber 14, and the other R-eva 20a is provided.
In this embodiment, the airbag 20b is embedded in the back of the R chamber 14. The air cooled by the R evaporator 20a is blown by the R fan 22 and sent to the R chamber 14 and the V chamber 16.

(Third Embodiment) Regarding the third embodiment,
A description will be given based on FIGS. 4 and 5.

The difference between this embodiment and the first embodiment is that
A heat pipe 56 is provided instead of the defrosting duct 38 and the R cooling duct 40.

FIG. 4 is a longitudinal sectional view of the refrigerator of this embodiment, and FIG. 5 is a refrigeration cycle thereof.

The heat of the V chamber 16 is sent to the lower cooling space 28 by the transfer of the latent heat of the refrigerant inside the heat pipe 56, and the heat of the cold air in the lower cooling space 28 is sent to the R chamber 14.

When the defrosting of the fuel tank 30 is not performed, the function of the heat pipe 56 is stopped.

(Fourth Embodiment) The difference between this embodiment and the first embodiment lies in the flow of the refrigerant when defrosting the F-eva 30 in the R mode.

In the first embodiment, since the refrigerant cooled to -20 ° C. exists inside the F
In order to remove the frost adhering to the evaporator 30, it is necessary to simultaneously raise the temperature of the internal refrigerant. Therefore, it is difficult to perform defrosting by the heat load.

Therefore, in the present embodiment, when defrosting the F-eva 30, the first valve 46 and the second valve 48 are closed, and the refrigerant inside the F-eva 30 is sent to the condenser 42 and the like by the compressor 36. After that, the F-eva 30 is defrosted in the R mode.

By doing so, no refrigerant is left inside the F-eva 30 and the heat load for defrosting is reduced by the frost and the F-eva 30
And the heat capacity can be reduced only to reduce the defrosting time. In addition, frost remains and the temperature rise in the F chamber 18 can be reduced, and the reliability is improved.

(Fifth Embodiment) A refrigeration cycle of this embodiment will be described with reference to FIG.

The feature of this embodiment is that a cycle for discharging the refrigerant from the fuel evaporator 30 described in the fourth embodiment is specially provided.

That is, the second valve 48 is provided between the R-eva 20 and the F-eva 30, and a path is provided in parallel with the F-eva 30 from the second capillary tube 50 to the compressor 36. Three valves 58 are provided.

The operation state of the refrigeration cycle will be described.

1. R mode In the R mode, the first valve 46 is opened, the second valve 48 is closed, and the third valve 58 is opened. Then, the compressor 36 is operated to cool the R evaporator to −3 ° C., and the refrigerant is not flown into the F evaporator 30.

2. F mode To cool the F chamber 18, the first valve 46 is closed and the second
The valve 48 is opened and the third valve 58 is closed. And Feva 3
0 is cooled to −20 ° C., and the F chamber 18 is cooled.

3. Defrosting of FEVA When defrosting the FEVA 30, the second valve 48 and the third valve 5
8 is closed, and the refrigerant in the fuel tank 30 is collected in the condenser 42. Thereafter, the first valve 46 and the second valve 48 are opened, and the third valve 46 is opened.
Close valve 58. Then, the R fan 22 is stopped, the frequency of the compressor 42 is adjusted, the temperature of the F-eva 30 is controlled to 0 ° C. or higher, and the F-eva 30 is defrosted.

4. Effect of the present embodiment In the present embodiment, defrosting is performed while flowing a refrigerant of 0 ° C. or more to the F-eva 30, so that the frost is overheated not only by the heat load of the R chamber 14 but also by the refrigerant of the refrigeration cycle. Therefore, the defrosting time is reduced, and the reliability is improved without fear of frost remaining.

(Sixth Embodiment) The sixth embodiment is different from the first embodiment in that the frequency of the F fan 32 can be controlled by inverter control so that the frequency of the F fan 32 can be varied. In that the opening / closing angle of the damper 54 is controllable to provide an air volume variable function.

In this embodiment, the opening degree of the F defrost damper 52 and the R cooling damper 54 and the F
By controlling the number of revolutions of the fan 32 to control the amount of high-temperature air flowing into the R chamber 14 into the F-eva 30, the amount of air is increased at the start of defrosting when the amount of frost is large, and the amount of air is increased immediately before the end. Is reduced to prevent an abnormal increase in the temperature of the fuel tank 30.

Thus, reliable defrosting and time reduction can be achieved, and energy saving and improvement in food preservability can be achieved.

(Seventh Embodiment) Refrigerator 1 of a seventh embodiment
00 will be described with reference to FIGS. 7 and 8.

FIG. 7A is a vertical sectional view of the left side of the cabinet 102 of the refrigerator 100, FIG. 7B is a vertical sectional view of the front side of the cabinet 102, and FIG. It is.

FIG. 8 is a drawing of the refrigeration cycle of this embodiment.

As shown in FIG. 7, there is a refrigerator space above the cabinet 102 of the refrigerator 100,
A chamber 106 is provided. A freezing space is provided below the cabinet 102, and an F chamber 108 is provided in two upper and lower stages.

At the back of the R chamber 104, an upper cooling space 116 is provided which is separated from the R chamber 104 and the V chamber 106. Inside the upper cooling space 116, a first evaporator (hereinafter referred to as a first evaporator) is provided. ) 110 is provided, and a first fan 112 is provided above the first evaporator 110. First fan 11
In front of 2, an R damper 114 for controlling the cooling air blow from the first chamber 110 to the R chamber 104 is provided.

On the rear side of the F chamber 108, there is provided a lower cooling space 118 partitioned from the F chamber 108, and a second evaporator (hereinafter, referred to as a second evaporator) 120 and a second fan 122. I have. Further, an F damper 124 for controlling the cooling air blow from the second evaporator 120 to the F chamber 108 is provided.

A compressor 126 is provided at the rear of the bottom of the F chamber 108.

Further, inside the left and right side walls of the cabinet 102, four ducts 128, 130,
132 and 134 are provided. The ducts 128, 130, 132, and 134 are provided with dampers 129, 131, 133, and 135, respectively. The positions of the inlet and outlet of these ducts and the opening and closing of the damper in each operating state are configured as shown in Table 1.

[0087]

[Table 1] Next, a refrigeration cycle of this embodiment will be described with reference to FIG.

A condenser 136 is disposed downstream of the refrigerant of the compressor 126, and a three-way valve 138 is provided downstream of the condenser 136.

At the first outlet side of the three-way valve, a first valve 140 is provided.
And the first capillary tube 142 are connected.
The second capillary tube 144 is connected in parallel with the valve 140 and the first capillary tube 142.

The first chamber 110 is connected to the downstream side of the first capillary tube 142 and the second capillary tube 144.

A first check valve 1 is provided downstream of the first evaporator 110.
46 is connected and circulates to the compressor 126.

On the other hand, on the second outlet side of the three-way valve 138,
The second valve 148 and the third capillary tube 150 are connected, and the fourth valve 152 is connected in parallel with the second valve 148 and the third capillary tube 150. The third capillary tube 150 has the same resistance as the first capillary tube 142, and the fourth capillary tube 152 has the same resistance as the second capillary tube 144.

The second evaporator 120 is connected to the downstream side of the third capillary tube 150 and the fourth capillary tube 152.

The second check valve 1 is located downstream of the second evaporator 120.
54 is connected and circulates to the compressor 126.

The operation state of the refrigerator 100 having the above configuration will be described.

1. First R Mode First, a mode in which the first chamber 110 cools the R chamber 104 will be described (hereinafter, this state is referred to as a first R mode).

The first operation of the three-way valve 138 in the refrigeration cycle
The flow path on the side of the evaporator 110 is opened, the first valve 140 is opened, and the first
The refrigerant which has reached the refrigerator compartment temperature (hereinafter referred to as R temperature, for example, 0 ° C.) in the capillary tube 140 is supplied to the first evaporator 11.
At 0, the R chamber 104 is cooled. Then, the refrigerant is gasified, passes through the first check valve 146, and flows into the compressor 1
Return to 26.

At this time, the first fan 112 is operated, and R
The damper 114 is open, and the other ducts are closed. Then, the second fan 122 is stopped. By doing so, the R chamber 10 can be
4 can be cooled.

2. Second F Mode Next, a mode in which the second chamber 120 cools the F chamber 108 will be described (hereinafter, this state is referred to as a second F mode).

When the R chamber 104 is cooled to a predetermined temperature, the three-way valve 138 opens a flow path on the second evaporator 120 side, the second valve 148 is closed, and the refrigerant flows into the fourth capillary tube 1.
After passing through 52, it is cooled to a freezing room temperature (hereinafter, referred to as F temperature, for example, −20 ° C.), and is evaporated by the second evaporator 120. Then, the F chamber 108 is cooled. The gasified refrigerant passes through the second check valve 148 and returns to the compressor 126.

At this time, the F damper 124 is opened,
By operating the second fan 122, the other dampers are closed,
The first fan 112 is also stopped. Thereby, the cool air cooled by the second evaporator 120 flows only to the F chamber 108,
The F chamber 108 can be cooled.

On the other hand, in this state, the moisture in the F chamber 108 becomes frost and adheres to the second evaporator 120.

By the way, since the refrigerant does not flow through the first evaporator 110, it is adapted to the R temperature, and the frost adhering to the first evaporator 110 becomes dew, and is collected outside the refrigerator 100 as drain. If the amount of frost on the first evaporator 110 is large, R
The damper 114 between the chamber and the first fan 110 is opened, and the first fan 112 is operated to respond.

3. Second R Mode Next, a case where the second chamber 120 cools the R chamber 104 will be described (hereinafter, referred to as a second R mode).

The temperature of the F chamber 108 decreases, and in this case, if there is a request for cooling the R chamber 104, the second evaporator 120 is raised to the R temperature.

In order to raise the second evaporator 120 to the R temperature, the second valve 148 is opened, and the first capillary tube 14 is opened.
The refrigerant passes through the third capillary tube 150 having the same resistance as 2, and the refrigerant rises to the R temperature. Then, the refrigerant that has risen to the R temperature raises the second evaporator 120 to the R temperature. The gasified refrigerant is supplied to the second check valve 1
After passing through 48, the flow returns to the compressor 126.

The open / closed state of each duct and the flow of cool air in this case will be described.

First, the R damper 114 and the F damper 124
Is closed.

The right 1 duct 128 and the left 2 duct 134 cannot be used, so that the right 1 damper 129 and the left 2
The damper 135 is closed. The left 1 damper 13 and the right 2 duct 130 are used so that the left 1 duct 132 and the right 2 duct 130 can be used.
The third and right two dampers 131 are opened.

Thus, the air cooled to the R temperature by the second evaporator 120 passes through the first left duct 132 and passes through the R chamber 1
04 and cools the R chamber. The air that has cooled the R chamber 104 circulates through the right two ducts 130 to the second evaporator 120.

In the second F mode, if the first evaporator 110 is not completely defrosted, the R damper 114 is opened, the first fan 112 is operated by the driver, and the defrosting of the first evaporator 110 is completed.

4. First F Mode Next, a case where the first chamber 110 cools the F chamber 108 will be described (hereinafter, referred to as a first F mode).

When the R chamber 104 has cooled down to a predetermined temperature, there is a request to cool the F chamber 108 this time. In this case, the three-way valve 1
38 opens the flow path on the first evaporator 110 side and closes the first valve 140. Then, the refrigerant flows into the second capillary tube 144
And cooled to F temperature. The refrigerant cooled to the F temperature passes through the first evaporator 110 and evaporates here. The gasified refrigerant passes through the first check valve 146 and passes through the compressor 1
Circulate to 26.

The state of the damper at this time will be described.

The R damper 114 and the F damper 124 are kept closed.

The other right 1 damper 129, right 2 damper 131, left 1 damper 133, and left 2 damper 135 are left open.

In this state, the cool air cooled to the F temperature by the first evaporator 110 passes through the right one duct 128 to the F chamber 108.
And the F chamber 108 is cooled. The cool air that has cooled the F chamber 108 circulates through the left two ducts 134 to the first evaporator 110. Thereby, the F chamber 108 is cooled.

The air corresponding to the R temperature in the R chamber 104 flows to the second evaporator 120 through the two right ducts 130 to melt the frost in the second evaporator 120 to perform defrosting. Then, the air that has been defrosted and cooled by the second evaporator 120 is the left one duct 1
It returns to the R chamber 104 through 32 and cools the R chamber 104.

Thus, the F chamber 108 is moved from the first chamber 11
The second chamber 120 can be defrosted while being cooled at 0, and the R chamber 104 can be cooled.

[0120] 5. Transition period from the first F mode to the first R mode When the temperature of the F chamber 108 drops to the set temperature and there is a cooling request in the R chamber 104, the mode shifts to the first R mode described above.

There are two types of this transition method.

(1) If the defrosting of the second evaporator 120 has been completed, the operation of the second fan 122 is stopped and the damper 12
Close 9-135.

(2) However, if the defrosting of the second evaporator 120 has not been completed, the second fan 122 is operated to
With the duct 132 and the right two ducts 134 kept open, a part of the air at the R temperature in the R chamber 104 is continuously supplied to the second evaporator 120.
Circulate for defrosting. From the above, the second eva 12
Zero defrost can be completely performed.

6. Effects of the present embodiment In the present embodiment, the first evaporator 110 and the second evaporator 120 are used.
The first chamber 110 and the second chamber 120 are used to cool the R chamber 104 alternately, so that the frost adhering when the F chamber 108 is cooled is sufficiently melted. And defrosting can be performed without using a defrost heater. During defrosting, the R chamber 104
Can be cooled, the rise in the temperature in the refrigerator can be prevented, and the preservability of food can be improved, and energy can be saved.

[0125] 7. Modification of this embodiment In the above embodiment, the right one duct 128, the right two duct 130, the left one duct 132, and the left two duct 134 are used, but a heat pipe may be used instead of these ducts. it can.

Furthermore, an electronic expansion valve may be used instead of the capillary tube.

(Eighth Embodiment) Hereinafter, an eighth embodiment of the present invention will be described with reference to FIG.

The difference between this embodiment and the seventh embodiment lies in the structure of the refrigeration cycle.

That is, as shown in FIG. 9, the first capillary tube 142 is connected after the compressor 126 and the condenser 136. A four-way valve 156 is provided downstream of the first capillary tube 142. In FIG. 9, the four-way valve flows from A to B, flows from C to D, and flows from A to D.
It is possible to switch to the second pattern flowing from B to C.

On the B side of the four-way valve 156, the first
Is connected, and a second capillary tube 144 is connected downstream of the first evaporator 110. A second evaporator 120 is connected to the downstream side of the second capillary tube 144, and the second evaporator 120 is connected to D of the four-way valve 156.

The C of the four-way valve 156 is connected to the compressor 126.

The cabinet 102 of the refrigerator 100
The configuration of the damper and duct is the same as that of the seventh embodiment.

Hereinafter, each operation mode will be described.

1. Simultaneous operation of first R mode and second F mode A case where the first R mode and the second F mode are simultaneously operated will be described.

The state of the four-way valve 156 is switched to the first pattern.

Then, the refrigerant which has reached the R temperature in the first capillary tube 142 flows to the first evaporator 110 and the R chamber 1
04 is cooled.

Thereafter, the refrigerant that has reached the F temperature in the second capillary tube 144 evaporates in the second evaporator 120 to cool the F chamber 108.

At this time, the R damper 114 and the F damper 12
4, the right 1 damper 129, the right 2 damper 131, the left 1 damper 133, and the left 2 damper 135 are closed. Then, by rotating the first fan 112 and the second fan 122, the air that has reached the R temperature in the first evaporator 110 is sent to the R chamber 104, and the R chamber 104 is cooled. Further, the air that has reached the F temperature by the second fan 122 is sent to the F chamber 108, and the F chamber 108 is cooled.

As a result, the first R mode and the second F mode can be performed simultaneously.

2. Simultaneous operation of first R mode and second F mode (defrosting mode) A case where defrosting is performed by simultaneously operating the second R mode and the first F mode will be described.

When frost is formed on the second evaporator 120, this is detected and the four-way valve 156 is switched to the second pattern.

Then, the refrigerant which has reached the R temperature by the first capillary tube 142 passes through the second evaporator 120. Then, the passed refrigerant reaches the F temperature in the second capillary tube 144 and passes through the first evaporator 110.

Then, in this case, the R damper 114 and F
Close the damper 124, right 1 damper 129, right 2 damper 1
31, the left 1 damper 133 and the left 2 damper 135 are opened, and the cool air of the second evaporator 120 is sent to the R chamber 104,
The cool air of the evaporator 110 is sent to the F chamber 108.

As a result, the temperature of the second evaporator 120 becomes F
Since the temperature rises from the temperature to the R temperature, the frost melts and defrosting is performed. This cooled air is sent to the R room 104, and the R room 1
04 can be prevented from rising. On the other hand, F room 1
08 is cooled by the first evaporator 114,
The temperature of the chamber 108 does not rise.

When frost is formed on the first evaporator 110 in this state, defrosting is performed while performing simultaneous cooling by the same control.

[0146] 3. Effect of the present embodiment In the present embodiment, by using the four-way valve 156,
The first chamber can cool the F chamber 108 and the R chamber 104, and the second chamber 120 can cool the R chamber 104 and the F chamber 108.
Can be cooled. Then, in this case, defrosting can be performed when each evaporator cools the R chamber 104.

4. Modification of the present embodiment In the present embodiment, the first capillary tube 142
, An electronic expansion valve can be used, and a heat pipe can be used instead of the right one duct 128 to the left two duct 134.

(Ninth Embodiment) This embodiment is a modification of the refrigeration cycle of the eighth embodiment.

FIG. 10 shows a refrigeration cycle of this embodiment.

The present embodiment differs from the eighth embodiment in that a first short-circuit valve 158 and a second short-circuit valve 160 are provided.

The first short-circuit valve 158 is connected between the first evaporator 110 side of the second capillary tube 144 and the compressor 126, and the second short-circuit valve 160 is connected between the second evaporator 120 side and the compressor 126. Is what it is.

In a normal operation, when the first short-circuit valve 158 and the second short-circuit valve 160 are closed, the state becomes exactly the same as that of the eighth embodiment.

On the other hand, when the energy saving operation is performed when only the R chamber 104 is to be cooled or when only the F chamber 108 is to be cooled, the first short valve 158 and the second short valve 1
60 is used.

1. When only the R chamber 104 is cooled, the four-way valve 156 is set to the first pattern, and the first short-circuit valve 158 is
open.

In this case, the refrigerant circulates to the compressor 126 via the first capillary tube 142, the first evaporator 110, and the first short-circuit valve 158.

As a result, only the R chamber 104 can be cooled.

[0157] 2. When cooling only the F chamber 108 The four-way valve 156 is switched to the second pattern, and the second short-circuit valve 160 is opened.

As shown by the dotted arrows in FIG. 10, the refrigerant is supplied to the first capillary tube 142, the second evaporator 120,
The flow returns to the compressor 126 via the short-circuit valve 160.

Even in this state, the second evaporator 120 outputs R
Defrosting can be performed because the temperature is equivalent.

[0160] 3. According to the present embodiment, the first short-circuit valve 158 and the second short-circuit valve 16
By using 0, the first evaluation 110 and the second evaluation 12
It is possible to perform defrosting by increasing 0 to the R temperature.

[0161]

As described above, according to the refrigerator of the present invention,
Defrosting of the evaporator can be performed without using a defrost heater, which saves energy.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a refrigerator showing a first embodiment of the present invention, wherein (a) is a longitudinal sectional view on the left side of the refrigerator of the present embodiment,
(B) is a longitudinal sectional view of the same front, and (c) is a longitudinal sectional view of the same right side.

FIG. 2 is a refrigeration cycle of the first embodiment.

FIG. 3 is a longitudinal sectional view of a refrigerator according to a second embodiment.

FIG. 4 is a longitudinal sectional view of a refrigerator according to a third embodiment.

FIG. 5 is a refrigeration cycle of a fourth embodiment.

FIG. 6 is a drawing of a refrigeration cycle of a fifth embodiment.

FIG. 7 is a longitudinal sectional view of a refrigerator according to a seventh embodiment;
(A) is a longitudinal sectional view on the left side of the refrigerator of this embodiment, (b) is a longitudinal sectional view on the front, and (c) is a longitudinal sectional view on the right side.

FIG. 8 is a refrigeration cycle of a seventh embodiment.

FIG. 9 is a refrigeration cycle of an eighth embodiment.

FIG. 10 is a refrigeration cycle of a ninth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Refrigerator 12 Cabinet 14 R room 16 V room 18 F room 20 R eva 22 R fan 24 R damper 30 F eva 32 F fan 34 F damper 36 Compressor 38 F defrost duct 40 R cooling duct

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tsutomu Sakuma 1-6 Ota Toshiba-cho, Ibaraki-shi, Osaka Inside the Toshiba Osaka Plant Co., Ltd. (72) Inventor Takashi Doi 1-6 Ota-Toshiba-cho, Ibaraki-shi, Osaka (72) Inventor Akihiro Noguchi 1-6 Ota Toshiba-cho, Ibaraki-shi, Osaka F-term (reference) 3L045 AA01 AA02 AA03 AA04 AA07 BA01 CA02 DA02 EA01 FA01 HA02 HA06 JA14 LA10 LA14 NA03 NA07 PA04 PA05 3L046 AA01 AA02 AA03 AA04 AA07 BA01 CA12 CA17 DA06 JA03 JA10 LA02 LA08 LA12 MA04 MA05

Claims (8)

[Claims] 1. A refrigerator mode comprising a refrigerator, a refrigerator evaporator, a freezer, and a freezer evaporator, wherein the refrigerator compartment evaporator is cooled to the refrigerator compartment temperature to cool the refrigerator. In a refrigerator that alternates between a freezing mode in which a freezing room evaporator is cooled down to a freezing room temperature and a freezing room is cooled, in the refrigerating mode, the defrosting of the freezing room evaporator is performed using heat of the freezing room. A refrigerator characterized by that: 2. A duct is provided to connect a space in which a refrigerator compartment and a freezer compartment evaporator are housed, and the air in the refrigerator compartment is sent to the freezer compartment evaporator by using this duct, and the defrosting of the freezer compartment evaporator is performed. The refrigerator according to claim 1, wherein 3. A heat pipe for connecting a space in which the refrigerator compartment and the freezer compartment evaporator are stored, and using this heat pipe, heat of the refrigerator compartment is sent to the freezer compartment evaporator, and the heat of the freezer compartment evaporator is reduced. The refrigerator according to claim 1, wherein defrosting is performed. 4. The refrigerator according to claim 1, wherein when the evaporator for the freezer compartment is defrosted, the refrigerant inside the evaporator for the freezer compartment is removed to reduce the heat load for defrosting. 5. A first refrigerating mode comprising a refrigerating compartment, a first evaporator, a freezing compartment, and a second evaporator, wherein the first evaporator is cooled to a refrigerating compartment temperature to cool the refrigerating compartment; A second refrigeration mode in which the second evaporator is cooled to the refrigerator compartment temperature to cool the refrigerator compartment; a first refrigeration mode in which the first evaporator is cooled to the freezer compartment temperature to cool the freezer compartment; A refrigerator characterized in that in a second freezing mode in which a freezing room is cooled down to a room temperature and in a first freezing mode, defrosting of a second evaporator is performed using heat of air in a cold room. 6. A space having a first evaporator accommodated therein, a first duct connecting a freezing room, a space accommodating a second evaporator, and a second duct connecting a refrigerating room. In the refrigeration mode, the air in the first evaporator is sent to the freezer using the first duct to cool the freezer, and the air in the refrigerator is sent to the second evaporator using the second duct, and The refrigerator according to claim 5, wherein defrosting of the two evaporators is performed. 7. A first evaporator and a second evaporator are connected in series,
A four-way valve for changing the direction of flow of the refrigerant is provided. The refrigerant is caused to flow from the first evaporator to the second evaporator by the four-way valve, thereby simultaneously performing the first refrigeration mode and the second refrigeration mode. The refrigerator according to claim 5, wherein the second refrigeration mode and the first refrigeration mode are simultaneously performed by flowing a refrigerant from the second evaporator to the first evaporator. 8. The refrigerator according to claim 1, wherein the refrigerant is a flammable refrigerant.