JP2017146080A - refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator which has superior energy-saving performance.SOLUTION: The present invention relates to a refrigerator that comprises a plurality of storage rooms in the refrigerator, and has a freezing cycle including a first evaporator and a second evaporator for cooling the storage rooms, a compressor for compressing a gaseous refrigerant sent from the first evaporator and second evaporator, a condenser for condensing a gaseous refrigerant sent from the compressor into a liquid, and a capillary tube for decompressing a liquid refrigerant sent from the condenser. The first evaporator cools the plurality of storage rooms and the second evaporator further cools some of the storage rooms that the first evaporator cools.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a refrigerator.

  Conventionally, refrigerators are cooled by one evaporator or by two evaporators for refrigeration and freezing, for example (see Patent Document 1).

JP 2001-263902 A

  However, when cooling a room in the third temperature zone other than the refrigerator compartment and the freezer compartment, it becomes difficult to cool the room in the third temperature zone with an appropriate temperature evaporator, and the cooling performance is insufficient, The temperature of the evaporator may be too low compared to the third temperature range, and energy saving performance may deteriorate.

  An object of this invention is to provide the refrigerator excellent in energy saving performance in view of the above point.

  In order to solve the above-described problem, the refrigerator of the present embodiment includes a plurality of storage chambers inside the refrigerator, a first evaporator and a second evaporator that cool the storage chamber, and a first evaporator and a second evaporator. A compressor that compresses the gaseous refrigerant sent from the compressor, a condenser that condenses the gaseous refrigerant sent from the compressor into a liquid state, and a capillary tube that depressurizes the liquid refrigerant sent from the condenser, The first evaporator cools a plurality of storage chambers, and the second evaporator further cools any one of the storage chambers cooled by the first evaporator.

It is the longitudinal cross-sectional view seen from the right side of the refrigerator which shows 1st embodiment of this invention. It is the front view which abbreviate | omitted the door of the refrigerator which shows 1st embodiment of this invention. It is the refrigerating cycle of the refrigerator which shows 1st embodiment of this invention. It is the refrigerating cycle of the refrigerator which shows 2nd embodiment of this invention. It is the refrigerating cycle of the refrigerator which shows 3rd embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected about the member which is common also in each embodiment.

(First embodiment)
FIG. 1 is a longitudinal sectional view as seen from the right side of the refrigerator 1.

  The housing of the refrigerator 1 is a heat-insulating box body in which the front surface is opened by foaming and filling a heat insulating material such as urethane foam in the gap between the outer box made of steel plate and the inner box made of synthetic resin. 2 is formed.

  The heat insulating box 2 is divided into upper and lower portions by a heat insulating partition wall 3, and an upper portion thereof becomes a first storage room (hereinafter referred to as R room) 30 which is a space cooled to a refrigeration temperature zone (for example, 1 to 4 ° C.). The lower part is a third storage room (hereinafter referred to as F room) 40 which is a space cooled to a freezing temperature zone (for example, −20 to −10 ° C.). In this embodiment, the cool air in the R chamber 30 and the F chamber 40 is completely independent, and the cool air is not mixed.

  The inside of the R chamber 30 is partitioned into a refrigerator compartment 5 and a vegetable compartment 6 by the refrigerator compartment plate 4. The opening part of this refrigerator compartment 5 and the front of the vegetable compartment 6 has the door which has a heat insulation function. The refrigerating chamber 5 is provided with a second storage chamber 7 called a chilled chamber or a partial chamber that is cooled to a temperature range lower than the refrigerating temperature range (for example, 0 to 1 ° C.).

  In the F chamber 40, a first freezing chamber 8 and an ice making chamber 50 are provided side by side on the upper side, and a second freezing chamber 9 is provided on the lower side. Each room has an opening / closing door having a heat insulating function.

  Each storage room is provided with an internal temperature sensor for detecting the temperature in the storage space (internal temperature), and each open / close door is provided with a door switch for detecting opening / closing of the door.

  As shown in FIG. 2, a first evaporator (hereinafter may be referred to as “first evaporator”) 10 and a second evaporator (hereinafter referred to as “second evaporator”) may be provided on the back surface of the second storage chamber 7. 11) and a cooling fan for the second storage chamber (hereinafter may be referred to as a second fan) 14, and a cooling fan for the first storage chamber (hereinafter referred to as a first fan) on the back of the vegetable compartment 6. 13) is arranged, and the first fan 13 and the second fan 14 are arbitrarily operated by changing the internal temperature or opening / closing the door. The rear surface of the refrigerating room 5 is a duct 49 for supplying cold air to the inside of the R room 30, and the first evaporator 10 includes the refrigerating room 5, the vegetable room 6, and the second storage room 7. The whole is cooled, and the second evaporator 11 further cools the second storage chamber 7.

  Specifically, the air cooled by the first evaporator 10 is supplied into the refrigerator compartment 5 from the blower outlet 41 through the duct 49 provided on the back surface of the refrigerator compartment 5 by the rotation of the first fan 13. It flows from the upper side to the lower side while cooling the inside of the chamber 5. At that time, the air supplied into the refrigerator compartment 5 indirectly cools the second storage chamber 7 by flowing outside the second storage chamber 7. And the cool air which cooled the refrigerator compartment 5 and the 2nd storage chamber 7 flows in into the vegetable compartment 6 through the vent 42 provided in the bottom face of the refrigerator compartment 5, and after cooling the vegetable compartment 6, the vegetable compartment 6 is returned to the first evaporator 10 from the suction port 43 opened to 6 and cooled again.

  In addition, the air cooled by the second evaporator 11 is supplied into the second storage chamber 7 from the blow-out opening 44 opened at the back of the second storage chamber 7 by the rotation of the second fan 14. After cooling, the air is returned to the second evaporator 11 from the suction port 45 opened to the second storage chamber 7 and cooled again.

  On the back surfaces of the first freezer compartment 8 and the second freezer compartment 9, a third evaporator (hereinafter may be referred to as a third evaporator) 12 and a third storage chamber cooling fan (hereinafter referred to as a third fan). 15) is arranged, and the third fan 15 is also arbitrarily operated by changing the internal temperature and opening / closing the door, similarly to the first fan 13. Then, the air cooled by the third evaporator 12 by the rotation of the third fan 15 is supplied from the outlet 46 provided on the back of the first freezer compartment 8, the second freezer compartment 9, and the ice making compartment 50 to each storage compartment 8, 9 and 50, the storage chambers 8, 9, and 50 are cooled. The air supplied to the first freezing chamber 8 and the ice making chamber 50 flows into the second freezing chamber 9 through the vent 47 and merges with the air blown out from the outlet 46 to the second freezing chamber 9, and then the first It returns to the 3rd evaporator 12 from the suction inlet 48 opened to the two freezing rooms 9, and is cooled again.

  A machine room is provided at the bottom of the back of the refrigerator 1, and a compressor 17 is provided in the machine room.

  Next, the refrigeration cycle of the refrigerator 1 will be described based on FIG.

  In the refrigeration cycle according to the present embodiment, a compressor 17 that compresses a gaseous refrigerant sent from the first evaporator 10, the second evaporator 11, and the third evaporator 12 and discharges a high-temperature and high-pressure gaseous refrigerant. And a condenser 16 that dissipates the gaseous refrigerant discharged from the compressor 17 to condense into a liquid state, a switching valve 23 provided on the outlet side of the condenser 16, and an outlet side of the switching valve 23. The first evacuation 10, the second evacuation 11, and the third evacuation 12 are provided.

  In this example, the switching valve 23 is a four-way valve provided with three channels on the outlet side, and the first outlet side channel may be referred to as a first evaporator capillary tube (hereinafter referred to as a first capillary tube). 24) and the first evaporator 10 are sequentially connected, and the second evaporator capillary tube (hereinafter sometimes referred to as a second capillary tube) 25 and the second evaporator 11 are sequentially connected to the second outlet-side flow path. A third evaporator capillary tube (hereinafter sometimes referred to as a third capillary tube) 26 and the third evaporator 12 are sequentially connected to the third outlet-side flow path.

  An accumulator 18 and a check valve 20 are connected to the outlet pipe of the third evaporator 12. The outlet side of the check valve 20 merges with the outlet piping of the first and second evaporators 10 and 11 and is connected to the suction side of the compressor 17.

  The flow of the refrigerant in such a refrigeration cycle will be described.

  The compressor 17 compresses the low-temperature and low-pressure gaseous refrigerant sent from each evaporator and discharges it to the condenser 16. The condenser 16 condenses the high-temperature and high-pressure gaseous refrigerant sent by the compressor 17 and then supplies the condensed refrigerant to the switching valve 23. The switching valve 23 causes the refrigerant that flows from the condenser 16 to flow into one flow path selected from the three flow paths on the outlet side, so that the liquid refrigerant that has been decompressed and reduced in temperature in the capillary tube is supplied to the first evaporator 10, The vaporizer is supplied by switching to one of the second evaporator 11 and the third evaporator 12. In the evaporator, the low-temperature, low-pressure liquid refrigerant absorbs heat and vaporizes. Thereby, the circumference | surroundings of an evaporator are cooled and it cools by sending the cold air into each storage chamber.

  Specifically, when the F chamber 40 is cooled (hereinafter referred to as the refrigeration mode), the compressor 17 is operated, and the switching valve 23 is switched so that the refrigerant is supplied to the third capillary tube 26. As a result, the refrigerant depressurized by the third capillary tube 26 enters the third evaporator 12, vaporizes, cools the third evaporator 12, and then returns to the compressor 17 again. That is, the refrigerant in the refrigeration mode flows from the switching valve 23 in the order of the third capillary tube 26, the third evaporator 12, the accumulator 18, and the check valve 20, and cold air flows through the F chamber 40 by the operation of the third fan 15. It circulates and the 1st freezer compartment 8, the 2nd freezer compartment 9, and the ice making room 50 are cooled.

  When the R chamber 30 is cooled (hereinafter referred to as the first refrigeration mode), the compressor 17 is operated, and the switching valve 23 is switched so that the refrigerant is supplied to the first capillary tube 24. As a result, the refrigerant decompressed by the first capillary tube 24 enters the first evaporator 10 and is vaporized. After cooling the first evaporator 10, the refrigerant returns to the compressor 17 again. That is, the refrigerant flows from the switching valve 23 in the order of the first capillary tube 24, the first evaporator 10, and the compressor 17. Cold air circulates in the R chamber 30 by the operation of the first fan 13, and the refrigerator compartment 5, the vegetable compartment 6, and the second storage compartment 7 are cooled.

  When the second storage chamber 7 is cooled by the second evaporator 11 (hereinafter referred to as the second refrigeration mode), the compressor 17 is operated and the second capillary is operated in the same manner as in the refrigeration mode and the first refrigeration mode. The switching valve 23 is switched so that the refrigerant is supplied to the tube 25. As a result, the refrigerant depressurized by the second capillary tube 25 enters the second evaporator 11, vaporizes, cools the second evaporator 11, and then returns to the compressor 17 again. That is, the refrigerant flows from the switching valve 23 in the order of the second capillary tube 25, the second evaporator 11, and the compressor 17. The cold air circulates in the second storage chamber 7 by the operation of the second fan 14, and the second storage chamber 7 is cooled.

  In the refrigerator 1 of the present embodiment, the first evaporator 10 cools the refrigerator compartment 5, the vegetable compartment 6, and the second storage chamber 7, and the second evaporator 11 cools the second storage chamber 7. That is, in the refrigerator 1 of this embodiment, the 2nd storage chamber 7 set to a low temperature range compared with the refrigerator compartment 5 and the vegetable compartment 6 cools the R room 30 (the refrigerator compartment 5 and the vegetable compartment 6). Since it is cooled not only by the first evaporator 10 but also by the second evaporator 11 provided separately from the first evaporator 10, the cooling temperature is sufficient as compared with the case where the second storage chamber 7 is cooled only by the first evaporator 10. Can be ensured and can be cooled stably.

  Further, since the second evaporator 11 is provided separately from the third evaporator 12 that cools the F chamber 40 (the first freezing chamber 8, the second freezing chamber 9, and the ice making chamber 50), the temperature of the evaporator is low. The problem of deterioration of energy saving performance due to being too much can be solved and the energy saving effect can be exhibited.

  Therefore, in this embodiment, the storage rooms of three different temperature zones provided in the refrigerator 1 can be cooled by the evaporators 10, 11, and 12 set to appropriate temperatures, and the power consumption is suppressed. In addition, each storage chamber can be cooled to a desired temperature.

  Moreover, in this embodiment, since the three evaporators 10, 11, and 12 are connected in parallel and the evaporator which supplies a refrigerant | coolant with the switching valve 23 can be switched, the temperature of each evaporator 10, 11, 12 or The cooling time can be easily controlled.

  Furthermore, in this embodiment, since the air cooled by the evaporators 10, 11, and 12 is supplied to each storage room by the fans 13, 14, and 15, the freedom degree of the layout of the evaporators 10, 11, and 12 is provided. It becomes high and it becomes easy to design the refrigerator excellent in manufacturability, suppressing dead space.

  Here, the kind of the evaporator used for the first evaporator 10, the second evaporator 11, and the third evaporator 12 is not particularly limited, and may be a finned tube heat exchanger, and natural convection heat exchange. However, a finned tube heat exchanger is more preferable in that the inside of the storage chamber can be cooled uniformly.

  Moreover, if the 2nd storage chamber 7 which the 2nd evaporator 11 cools is a storage chamber of the temperature zone lower than the other storage chambers 5 and 6 which the 1st evaporator 10 cools, the cooling temperature will not be specifically limited. .

  Moreover, in this embodiment, the 2nd storage chamber 7 cooled with the 2nd evaporator 11 is divided in the refrigerator compartment 5 cooled with the 1st evaporator 10, in other words, with the same opening / closing door. Although the case where the 2nd storage room 7 and the refrigerator compartment 5 were provided in the space where a front surface is obstruct | occluded was demonstrated, the space where the 2nd storage compartment 7 is obstruct | occluded by the opening / closing door different from the refrigerator compartment 5 and the vegetable compartment 6 May be provided.

  In this embodiment, the case where the R chamber 30 and the F chamber 40 are cooled by two different evaporators has been described. However, the present invention is not limited to this, and the R chamber 30 and the F chamber 40 are combined into one evaporator. The second storage chamber 7 may be cooled by an evaporator different from this evaporator.

(Second embodiment)
The refrigerator concerning 2nd embodiment is demonstrated based on FIG. In the present embodiment, the configuration of the refrigeration cycle is different from that of the first embodiment described above.

  Specifically, the discharge side of the compressor 17 is connected to the inlet side of the condenser 16, and the switching valve 22 including a three-way valve is connected to the outlet side of the condenser 16. The third evacuation 12 and the second evacuation 11 are connected in series to one outlet side channel of the switching valve 22 via the third capillary tube 26 in this order, and the other outlet side channel is connected to the first outlet channel. The first EVA 10 is connected via the capillary tube 24. That is, the first EVA 10 is connected in parallel to the third EVA 12 and the second EVA 11 connected in series.

  The switching valve 22 includes a throttling mechanism capable of switching and supplying the refrigerant flowing from the condenser 16 to one of the channels selected from the two channels on the outlet side and controlling the amount of refrigerant supplied to the selected channel. ing.

  An accumulator 18 and a check valve 20 are connected to the outlet pipe of the second evaporator 11, and the outlet side of the check valve 20 merges with the outlet pipe of the first evaporator 10, and then the suction side of the compressor 17. It is connected.

  After the refrigerant discharged from the compressor 17 passes through the condenser 16, the refrigerant flow path is switched by the switching valve 22, and the third and second EVAs 12 and 11 and the first EVA 10 are alternately connected in series. Sent to.

  Specifically, when the F chamber 40 is cooled (hereinafter referred to as the second refrigeration mode), the compressor 17 is operated, and the switching valve 22 is switched so that the refrigerant is supplied to the third capillary tube 26. As a result, the refrigerant decompressed by the third capillary tube 26 flows into the third evaporator 12 and is vaporized, thereby cooling the third evaporator 12 and the liquid refrigerant remaining without being vaporized by the third evaporator 12. The second evaporator 11 is cooled by flowing into the second evaporator 11 and vaporizing, and then returned to the compressor 17 again. In other words, in the second refrigeration mode, the refrigerant flows in the order of the third capillary 26, the third evaporator 12, the second evaporator 11, the accumulator 18, and the check valve 20. Circulates in the F chamber 40, and the cold air from the second evaporator 11 circulates in the second storage chamber 7 by the operation of the second fan 14, and cooling is performed.

  In such a second freezing mode, the cooling capacity of the second evaporator 11 is adjusted by adjusting the amount of refrigerant that the switching valve 22 supplies to the third capillary tube 26. That is, when the cooling capacity of the second evaporator 11 is reduced, the liquid state of the liquid flowing into the third evaporator 12 via the third capillary tube 26 is reduced by reducing the throttle opening of the throttle mechanism provided in the switching valve 22. The amount of the refrigerant is reduced, and the flow rate of the liquid refrigerant flowing into the second evaporator 11 is reduced so that the liquid refrigerant disappears in the middle of the second evaporator 11. Thereby, the heat absorption amount of the refrigerant in the second evaporator 11 is reduced, and the cooling capacity of the second evaporator 11 is reduced. On the other hand, when the cooling capacity of the second evaporator 11 is increased, a liquid-like liquid flowing into the third evaporator 12 through the third capillary tube 26 by increasing the throttle opening of the throttle mechanism provided in the switching valve 22. The amount of the refrigerant is increased and the flow rate of the liquid refrigerant flowing into the second evaporator 11 is increased. Thereby, the heat absorption amount of the refrigerant in the second evaporator 11 is increased, and the cooling capacity of the second evaporator 11 is increased.

  In this way, the evaporator (in this example, the third evaporator 12) that cools the storage chamber in the lower temperature zone is upstream, and the evaporator (in this example, the second evaporator is) that cools the storage chamber in the higher temperature zone. 11) are connected in series so as to be on the downstream side, and by adjusting the amount of refrigerant supplied to the second evaporator 11 via the third evaporator 12 by the throttle mechanism, the two evaporators 11, 12 can be simultaneously cooled, only the upstream evaporator 12 connected in series can be cooled, or the cooling capacity of the downstream evaporator 11 can be continuously changed. Therefore, the three different temperature chambers can be cooled by the appropriate temperature evaporator.

(Third embodiment)
The refrigerator concerning 3rd embodiment is demonstrated based on FIG. In the present embodiment, the configuration of the refrigeration cycle is different from the first and second embodiments described above.

  Specifically, the discharge side of the compressor 17 is connected to the inlet side of the condenser 16, and the switching valve 22 including a three-way valve is connected to the outlet side of the condenser 16. The second evacuation 11 and the first evacuation 10 are connected in series to one outlet side channel of the switching valve 22 via the second capillary tube 25 in this order, and the other outlet side channel is connected to the third evacuation channel. The third EVA 12 is connected via the capillary tube 26. That is, the third EVA 12 is connected in parallel to the second EVA 11 and the first EVA 10 connected in series.

  The switching valve 22 includes a throttling mechanism capable of switching and supplying the refrigerant flowing from the condenser 16 to one of the channels selected from the two channels on the outlet side and controlling the amount of refrigerant supplied to the selected channel. ing.

  An accumulator 18 and a check valve 20 are connected to the outlet pipe of the third evaporator 12, and the outlet side of the check valve 20 joins the outlet pipe of the first evaporator 10, and then the suction side of the compressor 17. It is connected.

  After the refrigerant discharged from the compressor 17 passes through the condenser 16, the refrigerant flow path is switched by the switching valve 22, and the second EVA 11 and the first EVA 10 connected in series and the third EVA 12 are alternately arranged. Sent to.

  When the R chamber 30 is cooled (hereinafter, referred to as a third refrigeration mode), the compressor 17 is operated, and the switching valve 22 is switched so that the refrigerant is supplied to the second capillary tube 25. As a result, the refrigerant decompressed by the second capillary tube 25 flows into the second evaporator 11 and is vaporized, thereby cooling the second evaporator 11 and the liquid refrigerant remaining without being vaporized by the second evaporator is the first refrigerant. The first evaporator is cooled by flowing into the evaporator and vaporizing, and then returned to the compressor 17 again. That is, in the third refrigeration mode, the refrigerant flows in the order of the second capillary tube 25, the second evacuation 11, and the first evacuation 10, and the cold air generated by the second evacuation 11 passes through the second storage chamber 7 by the operation of the second fan 14. The air is circulated, and cold air from the first evaporator 10 is circulated through the refrigerator compartment 5 by the operation of the first fan 13 to perform cooling.

  In the third refrigeration mode, the cooling capacity of the first evaporator 10 is adjusted by adjusting the amount of refrigerant that the switching valve 22 supplies to the second capillary tube 25. That is, when reducing the cooling capacity of the first evaporator 10, the liquid state of the liquid flowing into the second evaporator 11 through the second capillary tube 25 is reduced by reducing the throttle opening of the throttle mechanism provided in the switching valve 22. The amount of the refrigerant is reduced, and the flow rate of the liquid refrigerant flowing into the first evaporator 10 is reduced so that the liquid refrigerant disappears in the middle of the first evaporator 10. Thereby, the heat absorption amount of the refrigerant in the first evaporator 10 is reduced, and the cooling capacity of the first evaporator 10 is reduced. On the other hand, when the cooling capacity of the first evaporator 10 is increased, the liquid-like liquid flowing into the second evaporator 11 via the second capillary tube 25 is increased by increasing the throttle opening of the throttle mechanism provided in the switching valve 22. The amount of the refrigerant is increased, and the flow rate of the liquid refrigerant flowing into the first evaporator 10 is increased. Thereby, the heat absorption amount of the refrigerant in the first evaporator 10 is increased, and the cooling capacity of the first evaporator 10 is increased.

  In this way, the evaporator (in this example, the second evaporator 11) that cools the storage chamber in the lower temperature zone is upstream, and the evaporator (in this example, the first evaporator is) that cools the storage chamber in the higher temperature zone. The two evaporators 10, 10) are connected in series so as to be on the downstream side, and the amount of refrigerant supplied to the first evaporator 10 through the second evaporator 11 is adjusted by the throttle mechanism, 11 can be simultaneously cooled, only the upstream evaporator 11 connected in series can be cooled, or the cooling capacity of the downstream evaporator 10 can be continuously changed. Therefore, the three different temperature chambers can be cooled by the appropriate temperature evaporator.

  In addition, in 2nd embodiment and 3rd embodiment, since another structure and effect | action are the same as that of the said 1st embodiment, the description is abbreviate | omitted.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Heat insulation box 3 Heat insulation partition wall 4 Refrigeration partition plate 5 Refrigeration room 6 Vegetable room 7 Second storage room 8 First freezing room 9 Second freezing room 10 First EVA 11 Second Eve 12 Third Eve 13 First Fan 14 Second fan 15 Third fan 16 Condenser 17 Compressor 18 Accumulator 19 Throttle mechanism 20 Check valve 22, 23 Switching valve 24 First capillary tube 25 Second capillary tube 26 Third capillary tube 30 R chamber 40 F Chambers 41, 44, 46 Air outlets 42, 47 Air vents 43, 45, 48 Air inlet 49 Duct 50 Ice making chamber

Claims (7)

It has multiple storage rooms inside the refrigerator,
A first evaporator and a second evaporator for cooling the storage chamber;
A compressor for compressing a gaseous refrigerant sent from the first evaporator and the second evaporator;
A condenser that condenses the gaseous refrigerant sent from the compressor into a liquid state;
A capillary tube for depressurizing the liquid refrigerant sent from the condenser;
A refrigerator having a refrigeration cycle comprising:
The first evaporator cools the plurality of storage rooms,
The second evaporator further cools any storage chamber cooled by the first evaporator. The storage room includes a first storage room and a second storage room,
The second storage room is a storage room provided in the first storage room and having a temperature range lower than that of the first storage room,
The first evaporator cools the entire first storage chamber, including the second storage chamber,
The refrigerator according to claim 1, wherein the second evaporator further cools the second storage chamber. With a third evaporator,
The storage room includes a first storage room, a second storage room, and a third storage room,
The three storage rooms are storage rooms in different temperature zones,
A first evaporator cools the first storage chamber and the second storage chamber;
A second evaporator further cools the second storage chamber;
The refrigerator according to claim 1 or 2, wherein the third evaporator cools the third storage chamber. With a switching valve,
The first evaporator, the second evaporator, and the third evaporator are connected in parallel,
The switching valve supplies the refrigerant sent from the condenser to any one of the first evaporator, the second evaporator, and the third evaporator. Refrigerator. With a switching valve,
Two of the first evaporator, the second evaporator, and the third evaporator are connected in series,
Another evaporator is connected in parallel to two evaporators connected in series,
The switching valve supplies the refrigerant sent from the condenser to two evaporators connected in series, or another evaporator connected in parallel to the two evaporators connected in series. The refrigerator according to claim 3. The switching valve has a throttle mechanism for adjusting the refrigerant flow rate,
The first storage room is a storage room having a higher temperature zone than the second storage room and the third storage room,
The second storage room has a higher temperature range than the third storage room,
In order from the upstream of the refrigerant flow, the third evaporator and the second evaporator are connected in series,
The first evaporator is connected in parallel to the two evaporators connected in series,
The refrigerator according to claim 5, wherein the temperature of the second evaporator is controlled by adjusting the amount of refrigerant flowing through the third evaporator and the second evaporator by the throttle mechanism. The switching valve has a throttle mechanism for adjusting the refrigerant flow rate,
The first storage room is a storage room having a higher temperature zone than the second storage room and the third storage room,
The second storage room has a higher temperature range than the third storage room,
In order from the upstream of the refrigerant flow, the second evaporator and the first evaporator are connected in series,
A third evaporator is connected in parallel to two evaporators connected in series,
The refrigerator according to claim 5, wherein the temperature of the first evaporator is controlled by adjusting the amount of refrigerant flowing through the second evaporator and the first evaporator by the throttle mechanism.