JP2004132618A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of using both indirect cooling method and direct cooling method while surely keeping a high humidity. <P>SOLUTION: In this refrigerator, a compressor 18, a condenser 24, a first capillary tube 26, an R evaporator 10, and a wall surface cooling pipe 27 buried in the wall surface of a refrigeration chamber 2 are successively connected to constitute a refrigeration cycle. The evaporation temperature of the wall surface cooling pipe 27 is set lower than the evaporation temperature of the R evaporator 10 by 2-3°C. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a refrigerator combining a direct cooling type and an intercooling type.
[0002]
[Prior art]
Conventionally, as a refrigerator that combines a direct cooling type and an intercooling type, a compressor, a wall cooling pipe buried in the wall of the refrigerator compartment, and a cooling pipe arranged downstream of the wall cooling pipe, and cool air to the refrigerator compartment are provided. It has a refrigeration cycle consisting of a refrigerator evaporator (hereinafter simply referred to as R-eva) for supply, a throttle mechanism arranged upstream of the wall cooling pipe, and a throttle mechanism arranged between the cooling pipe and R-eva. The number of rotations of the compressor and the refrigerator air blower (hereinafter simply referred to as R fan) based on the difference between the refrigerator room setting air temperature and the refrigerator room air temperature and the difference between the refrigerator room setting wall temperature and the refrigerator room wall temperature. Is determined so that the refrigerator compartment air temperature becomes the refrigerator compartment set air temperature and the refrigerator compartment wall temperature becomes the refrigerator compartment set wall temperature (Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-346520
[Problems to be solved by the invention]
In the refrigerator disclosed in Patent Document 1, rapid cooling is performed by the effect of the R-eva and R-fan when the temperature in the refrigerator rises, and when the temperature in the refrigerator is stable, the wall cooling pipe is cooled by natural convection and radiation. It is possible to maintain high humidity suitable for food preservation.
[0005]
However, since the wall cooling pipe is buried in the wall of the refrigerator compartment, the thermal resistance increases, and the temperature becomes higher than the temperature of the cool air blown from the R-eva. Therefore, in order to maintain the cooling capacity of the wall cooling pipe, it is necessary to further lower the evaporation temperature of the R-eva, which is a problem of maintaining high humidity.
[0006]
Accordingly, the present invention has been made in view of the above problems, and provides a refrigerator that can use both the intercooling type and the direct cooling type while reliably maintaining a high humidity.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is connected in the order of a compressor, a condenser, a refrigerating throttle device, a refrigerating room evaporator for generating cool air sent by a refrigerating room blower, and a wall surface cooling pipe embedded in a wall surface of the refrigerating room. Wherein the wall temperature of the refrigerating compartment cooled by the wall cooling pipe and the surface temperature of the evaporator for the refrigerating compartment are substantially the same.
[0008]
The invention according to claim 2 is connected in the order of a compressor, a condenser, a refrigerating throttle device, a refrigerating room evaporator for generating cold air sent by a refrigerating room blower, and a wall surface cooling pipe buried in the wall surface of the refrigerating room. Wherein the evaporation temperature of the refrigerant in the wall cooling pipe is lower by 2 ° C. to 3 ° C. than the evaporation temperature of the evaporator for the refrigerator compartment.
[0009]
The invention according to claim 3 is the refrigerator according to claim 1 or 2, wherein the refrigeration cycle has an intermediate throttle means between the evaporator for the refrigerator compartment and the wall cooling pipe.
[0010]
The invention according to claim 4 is characterized in that the wall surface cooling pipe is buried in a wall surface of a ventilation path of cool air generated by the refrigerator compartment evaporator and sent by the refrigerator compartment blower. 3. The refrigerator according to one of the items 3.
[0011]
According to a fifth aspect of the present invention, the compressor is a two-stage compression compressor having a variable capacity, and the refrigeration cycle further includes a freezer evaporator, a gas-liquid separator, and a freezing throttle. Refrigerant discharged from the high-pressure side discharge port flows into the gas-liquid separation unit via the condenser, the refrigeration throttle unit, the refrigeration room evaporator, and the wall surface cooling pipe, and the refrigerant is discharged by the gas-liquid separation unit. The separated gas refrigerant is sucked from the intermediate pressure side suction port of the compressor through the intermediate pressure suction pipe, and the liquid refrigerant separated by the gas-liquid separation means is supplied to the freezing throttle means, the freezing room evaporator, A refrigerating cycle configured to be sucked from a low-pressure side suction port of the compressor through a suction pipe, and for sending cool air from the evaporator for the freezing room to the freezing room; A refrigerator according to an item of the preceding claims, characterized in 4 to have a.
[0012]
The invention according to claim 6 is characterized in that the refrigeration throttle means and the freezer evaporator are connected to the outlet side pipe of the wall surface cooling pipe, and the freezer blower for sending cool air from the freezer evaporator to the freezer. The refrigerator according to any one of claims 1 to 4, wherein the refrigerator is provided.
[0013]
The invention according to claim 7 is characterized in that the freezer compartment evaporator is connected in parallel with the refrigerator compartment evaporator and the wall surface cooling pipe, and sends the cool air from the freezer compartment evaporator to the freezer compartment. The refrigerator according to any one of claims 1 to 4, wherein the refrigerator is provided.
[0014]
In the refrigerator according to claim 1, since the wall cooling pipe is connected to the downstream side of the refrigerator evaporator, the wall temperature of the refrigerator cooled by the wall cooling pipe and the temperature of the refrigerator evaporator are reduced. The surface temperature can be substantially the same.
[0015]
According to the refrigerator of the second aspect, since the wall cooling pipe is connected to the downstream side of the refrigerator evaporator, the evaporation temperature of the refrigerant in the wall cooling pipe is 2.3 ° C. lower than the evaporation temperature of the freezer evaporator. Since the temperature can be lowered, the wall surface cooling pipe can be cooled without lowering the evaporation temperature of the refrigerator evaporator.
[0016]
According to the refrigerator of the third aspect, by providing an intermediate throttle means between the evaporator for the refrigerator compartment and the wall cooling pipe, the evaporation temperature of the evaporator for the refrigerator compartment can be surely set to be less than the evaporation temperature of the wall cooling pipe by two. Can be lowered by 3 ° C.
[0017]
Since the wall cooling pipe is buried in the wall of the air passage of the cool air sent by the refrigerator air blower, the cool air blown by the wall cooling pipe is cooled. Explaining with specific numerical values, assuming that the temperature of the wall cooling pipe is −2 ° C., the temperature of the wall of the refrigerator compartment is about 0 ° C. If the temperature of the refrigerator evaporator is 0 ° C., the temperature of the cool air sent from the refrigerator evaporator is 1 ° C. Therefore, when passing through the 0 ° C. wall surface, the cold air of 1 ° C. is cooled, and the temperature of the blowout in the refrigerator decreases. On the other hand, the temperature in the refrigerator is 2 ° C. to 3 ° C., and dew condensation occurs because the wall surface is 0 ° C. Since the above-mentioned cold air of 1 ° C. passes through the generated dew, the passed cold air absorbs and passes the moisture of the dew, and the blown-out cold air contains moisture. The inside can be humidified. In addition, there is an effect that dew condensation generated on the wall surface is removed by the cool air.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0019]
(1) Structure of Refrigerator 1 FIG. 2 is a longitudinal sectional view of the refrigerator 1 showing the present embodiment.
[0020]
The refrigerator 1 includes a refrigerator compartment 2, a vegetable compartment 3, an ice making compartment 4, and a freezer compartment 5 from the upper stage, and a machine compartment 6 on the back of the freezer compartment 5.
[0021]
The refrigerator compartment 2 and the vegetable compartment 3 form a refrigerator compartment 7, and the ice making compartment 4 and the freezer compartment 5 form a freezer compartment 8. The refrigerating space 7 and the freezing space 8 are separated by a heat insulating wall 9.
[0022]
A refrigerator evaporator (hereinafter referred to as R eva) 10 for cooling the refrigeration space 7 is disposed on the back of the vegetable compartment 3. Above the R eva 10, the cool air of the R eva 10 is cooled. A refrigeration room blower (hereinafter, referred to as an R fan) 12 for blowing air to the refrigerator is provided.
[0023]
A freezer evaporator (hereinafter referred to as F eva) 14 is provided from the ice making chamber 4 to the back of the freezer 5, and a refrigeration unit that blows cold air of the F eva 14 to the free space 8 above the F eva 14. A room blower (hereinafter, referred to as an F fan) 16 is provided.
[0024]
The machine room 6 is provided with a two-stage compression compressor 18.
[0025]
A control device 20 composed of a microcomputer for controlling the refrigerator 1 is arranged at the upper rear part of the refrigerator compartment 2.
[0026]
(2) Structure of Refrigeration Room 2 The structure of the refrigeration room 2 will be described with reference to FIG.
[0027]
A chilled room 60 is provided on the lower right side of the refrigerator compartment 2, and a water tank (not shown) for sending water to an ice tray 46 in the ice making room 4 is provided on the left side of the chilled room 60.
[0028]
Inside the ceiling surface, right side surface, and left side surface of the refrigerator compartment 2, wall cooling pipes 27 are buried so as to be able to cool all of these surfaces.
[0029]
An R sensor 38 for detecting the temperature inside the refrigerator compartment 2 is disposed on the back of the refrigerator compartment 2, and a wall surface sensor 36 for detecting the wall surface temperature is disposed on the right side surface.
[0030]
In the center of the rear surface of the refrigerator compartment 2, a duct 62 for sending in the cool air blown by the R fan 12 from the R-eva 10 is provided, and a plurality of cool air outlets 64 for blowing cool air from a lower part to an upper part of the duct 62 are provided. It is open.
[0031]
A ceiling partition plate 68 is provided horizontally below the ceiling surface of the refrigerator compartment 2, and a ceiling space 70 is provided between the ceiling partition plate 68 and the ceiling surface. At the back of the ceiling space 70, the upper end of the duct 62 opens, and cool air from the duct 62 is blown to the ceiling space 70. Further, the front surface of the ceiling space 70 is open, and cool air is blown from the ceiling space 70 toward the lower surface of the refrigerator compartment 2.
[0032]
On the upper surface of the ceiling partition plate 68, an evaporating dish 72 for receiving dew condensation on the ceiling surface is arranged. A light 66 is provided on the lower surface of the ceiling partition plate 68 to illuminate the inside of the refrigerator compartment 2.
[0033]
(3) Configuration of Refrigeration Cycle 22 A configuration and an operation state of the refrigeration cycle 22 of the refrigerator 1 will be described with reference to FIG.
[0034]
FIG. 1 is a configuration diagram of the refrigeration cycle 22.
[0035]
(3-1) The high-pressure gas refrigerant discharged from the high-pressure side discharge port of the two-stage compression compressor 18 is condensed inside the condenser 24 and becomes a high-pressure two-phase refrigerant composed of a gas refrigerant and a liquid refrigerant.
[0036]
(3-2) The high-pressure two-phase refrigerant is decompressed in the first capillary tube 26 to become an intermediate-pressure two-phase refrigerant, and flows through the R-eva 10 and the wall-surface cooling pipe 27 in this order.
[0037]
(3-3) The refrigerant partially evaporates inside the R-eva 10 and the wall cooling pipe 27, enters the gas-liquid separator 28 in a two-phase state, and is separated into a liquid refrigerant and a gas refrigerant.
[0038]
(3-4) The gas refrigerant separated by the gas-liquid separator 28 returns to the intermediate pressure side suction port of the two-stage compression compressor 18 via the intermediate pressure suction pipe 30.
[0039]
(3-5) The liquid refrigerant separated inside the gas-liquid separator 28 is decompressed in the second capillary tube 32, becomes a low-pressure two-phase refrigerant, and enters the F-eva 14.
[0040]
(3-6) The refrigerant evaporates inside the F-eva 14 to become a gas refrigerant, and returns to the low-pressure side suction port of the two-stage compression compressor 18 via the low-pressure suction pipe 34.
[0041]
(4) Configuration of Electric System of Refrigerator 1 FIG. 3 is a block diagram of an electric system in the refrigeration cycle 22.
[0042]
As shown in FIG. 3, the motor of the two-stage compression compressor 18, the motor of the R fan 12, and the motor of the F fan 16 are connected to the control device 20.
[0043]
The control device 20 includes a wall surface sensor 36 for detecting the wall surface temperature of the refrigerator compartment 2, an R sensor 38 for detecting the internal temperature of the refrigerator compartment 2 (hereinafter referred to as R temperature), and a refrigerator of the freezer compartment 5. An F sensor 40 for detecting an internal temperature (hereinafter, referred to as an F temperature) is connected. Further, an R-evaporation sensor 42 for detecting the temperature of the R-evaporator 10 (hereinafter referred to as R-evaporation temperature) and an F-evaluation sensor 44 for detecting the temperature of the F-evaporator 14 (hereinafter referred to as the F-evaporation temperature) are also connected.
[0044]
The two-stage compression compressor 18 is subjected to inverter control by a control device 20. That is, the controller 20 changes the frequency in a drive circuit that controls the rotation of a motor (for example, a brushless DC motor) that rotates the two-stage compression compressor 18, thereby increasing or decreasing the performance of the two-stage compression compressor 18. Or
[0045]
(4) Control Method of Refrigerator 1 A control method of the refrigerator 1 having the above configuration will be described.
[0046]
As a method for cooling the refrigerating compartment 2, the refrigerating compartment 2 is cooled by the R-eva 10 and the wall cooling pipe 27. In this case, the evaporation temperature of the refrigerant flowing through the R-eva 10 is set to be higher by 2 ° C. to 3 ° C. than the evaporation temperature of the refrigerant flowing through the wall cooling pipe 27. That is, by providing the wall cooling pipe 27 downstream of the R-eva 10, the evaporation temperature of the wall cooling pipe 27 can be lowered by 2 ° C. to 3 ° C. from the evaporation temperature of the R-eva 10. For example, when the evaporation temperature of the R-eva 10 is 0 ° C., the surface temperature of the cooling pipe of the R-eva 10 (that is, the temperature of the cool air to be blown) by the R fan 12 is about 1 ° C. Further, the temperature of the wall cooling pipe 27 becomes about −2 ° C. lower by 2 ° C. to 3 ° C. than the evaporation temperature of the R-eva. Therefore, the wall surface temperature of the refrigerator compartment 2 becomes about 0 ° C. by the wall cooling pipe 27 stretched inside the refrigerator compartment 2. This difference is due to the thermal resistance of the wall. Thereby, the surface temperature of the cooling pipe of the R-eva 10 is about 1 ° C., the wall surface temperature of the refrigerator compartment 2 is about 0 ° C., and the temperatures of both are substantially the same.
[0047]
The cool air of about 1 ° C. blown out from the upper end of the duct 62 passes through the ceiling space. In this case, since the ceiling surface is cooled to about 0 ° C. by the wall surface cooling pipe 27, the cool air passing through the wall surface is further cooled, and the cool air blown into the refrigerator should be lowered to about 0.5 ° C. Can be. On the other hand, since the wall temperature of the ceiling surface is 0 ° C. and the temperature in the refrigerator is higher than that, there is a possibility that dew condensation has occurred on this ceiling surface. However, the passing cold air of about 1 ° C. evaporates and absorbs the dew to become humidified cold air, which is blown into the refrigerator. Therefore, the inside of the refrigerator can be maintained at a high humidity.
[0048]
Since the temperature inside the refrigerator compartment needs to be maintained at 2 ° C. to 3 ° C., the wall surface temperature is about 0 ° C. and the temperature of the cool air blown out from the cool air outlet is 0.5 to 1 ° C. Are substantially the same, and the inside of the refrigerator can be sufficiently cooled to 2-3 ° C.
[0049]
When the R temperature detected by the R sensor 38 falls from 2 ° C. to 3 ° C. or lower, the two-stage compression compressor 18 is stopped. Conversely, when the R temperature becomes 3 ° C. or higher, the two-stage compression compressor 18 is started.
[0050]
By detecting the R-eva temperature with the R-eva sensor 42 and detecting the wall surface temperature of the refrigerator compartment 2 with the wall sensor 36, the evaporation temperature of the R-eva 10 is always 2 ° C. to 3 ° C. lower than the evaporation temperature of the wall cooling pipe 27. The two-stage compression compressor 18 is inverter-controlled by the control device 20 so as to be lower.
[0051]
When controlling the temperature in the freezer compartment 5, the two-stage compression compressor 18 is inverter-controlled by the control device 20 so that the F temperature detected by the F sensor 40 changes from −18 ° C. to −20 ° C.
[0052]
(Second embodiment)
A refrigeration cycle 22 according to a second embodiment will be described with reference to FIG.
[0053]
In the first embodiment, the R-eva 10 and the wall surface cooling pipe 27 are directly connected. In the second embodiment, however, as shown in FIG. The capillary tube 29 is connected, and the evaporation temperature of the wall surface cooling pipe 27 is reliably lowered by 2 ° C. to 3 ° C. from the evaporation temperature of the R-eva 10 by the intermediate capillary tube 29.
[0054]
(Third embodiment)
A refrigeration cycle 22 according to a third embodiment will be described with reference to FIG.
[0055]
In the first embodiment, the R-eva, the wall cooling pipe 27, and the F-eva 14 are connected in series using the two-stage compression compressor 18, but in this embodiment, as shown in FIG. Using the compressor 17, the R-eva 10 and the wall cooling pipe 27 are connected in series, and the F-eva 14 is connected in parallel to the two connected in series.
[0056]
Specifically, as shown in FIG. 5, the condenser 24 is connected to the single-stage compression compressor 17, and a three-way valve 74 is provided on the outlet side of the condenser 24. Is provided, and a second capillary tube 32 connected to the Feva 14 is connected to the other outlet.
[0057]
Even in the present embodiment, since the wall cooling pipe 27 is connected to the downstream side of the R-eva 10, the evaporation temperature of the wall cooling pipe 27 can be lower by 2 ° C. to 3 ° C. than the evaporation temperature of the R-eva 10. it can.
[0058]
(Fourth embodiment)
A refrigeration cycle 22 according to a fourth embodiment will be described with reference to FIG.
[0059]
In the refrigeration cycle 22 of the fourth embodiment, the condenser 24 is connected to the single-stage compression compressor 17, a three-way valve 76 is connected to the outlet side of the condenser 24, and the first capillary tube 26 is connected to one outlet of the three-way valve 76. , R-eva, the wall cooling pipe 27, the second capillary tube 32, and the F-eva 14 are connected in series, and the other outlet of the three-way valve 76 is connected to the bypass pipe 78 connected to the second capillary tube 32.
[0060]
Thus, by switching the three-way valve 76, it is possible to switch between the refrigeration mode in which the refrigerant flows through the R eva 10, the wall cooling pipe 27, and the F eva 14, and the refrigeration mode in which the refrigerant flows only through the F eva 14. Then, in the refrigeration mode, the same effect as in the first embodiment can be obtained.
[0061]
(Fifth embodiment)
A refrigeration cycle 22 according to a fifth embodiment will be described with reference to FIG.
[0062]
The present embodiment is an example of the simplest refrigeration cycle that is different from the first to fourth embodiments in that the F-evaporator 14 is not provided, and that only the R-evaluator 10 and the wall cooling pipe 27 are provided.
[0063]
That is, the condenser 24 is connected to the single-stage compression compressor 17, and returns to the compressor 17 via the condenser 24, the first capillary tube 26, the R-eva 10, and the wall cooling pipe 27.
[0064]
With this refrigeration cycle 22, the same effect as in the first embodiment can be obtained in a refrigerator having only a refrigerator compartment without a refrigerator compartment.
[0065]
【The invention's effect】
As described above, in the refrigerator of the present invention, by connecting the wall surface cooling pipe downstream of the refrigerator compartment evaporator, the evaporation temperature of the refrigerant in the wall surface cooling pipe is reduced by 2 ° C. from the evaporation temperature of the refrigerator room evaporator by 3 ° C. ℃ lower, the temperature of the wall surface of the refrigerator compartment and the temperature of the cold air sent from the refrigerator compartment evaporator can be made substantially the same, and the interior of the refrigerator compartment can be cooled in a high humidity state. .
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a refrigeration cycle of a first embodiment.
FIG. 2 is a longitudinal sectional view of the refrigerator of the embodiment.
FIG. 3 is a block diagram of an electric system of the refrigerator.
FIG. 4 is a configuration diagram of a refrigeration cycle of a second embodiment.
FIG. 5 is a configuration diagram of a refrigeration cycle of a third embodiment.
FIG. 6 is a configuration diagram of a refrigeration cycle of a fourth embodiment.
FIG. 7 is a configuration diagram of a refrigeration cycle of a fifth embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigerating room 3 Vegetable room 4 Ice making room 5 Freezing room 6 Machine room 10 Rever 12 R fan 14 Fever 16 F fan 18 Two-stage compression compressor 20 Control device 22 Refrigeration cycle 24 Condenser 26 First capillary tube 27 Wall surface Cooling pipe 28 Gas-liquid separator 29 Intermediate capillary tube 32 Second capillary tube 36 Wall surface sensor 38 R sensor 40 F sensor 42 R evaluation sensor 44 F evaluation sensor

Claims (7)

A compressor, a condenser, a refrigerating throttle means, a refrigerating cycle evaporator for generating cold air sent by a refrigerating chamber blower, a refrigerating cycle connected in the order of a wall cooling pipe buried in the wall of the refrigerating chamber,
A refrigerator characterized in that the wall temperature of the refrigerator cooled by the wall cooling pipe and the surface temperature of the evaporator for the refrigerator are substantially the same. A compressor, a condenser, a refrigerating throttle means, a refrigerating cycle evaporator for generating cold air sent by a refrigerating chamber blower, a refrigerating cycle connected in the order of a wall cooling pipe buried in the wall of the refrigerating chamber,
A refrigerator, wherein the evaporation temperature of the refrigerant in the wall cooling pipe is lower by 2 ° C. to 3 ° C. than the evaporation temperature of the refrigerator compartment evaporator. The refrigeration cycle includes:
The refrigerator according to claim 1 or 2, further comprising an intermediate throttle unit between the refrigerator compartment evaporator and the wall surface cooling pipe. 4. The wall cooling pipe according to claim 1, wherein the wall cooling pipe is buried in a wall of an air passage of cool air generated by the refrigerator compartment evaporator and sent by the refrigerator compartment blower. 5. Refrigerator. The compressor is a variable capacity two-stage compression compressor,
The refrigerating cycle further includes a freezer evaporator, a gas-liquid separator, a freezing throttle,
Refrigerant discharged from the high-pressure side discharge port of the compressor flows into the gas-liquid separator through the condenser, the refrigeration restrictor, the refrigeration compartment evaporator, and the wall cooling pipe,
The gas refrigerant separated by the gas-liquid separation means is sucked from the intermediate pressure side suction port of the compressor via an intermediate pressure suction pipe,
A refrigeration cycle is configured such that the liquid refrigerant separated by the gas-liquid separation unit is sucked from the low-pressure side suction port of the compressor through the refrigeration throttle unit, the freezer evaporator, and a low-pressure suction pipe,
The freezer compartment blower for sending cold air from the freezer evaporator to the freezer,
The refrigerator according to any one of claims 1 to 4, further comprising: A throttling unit for freezing and an evaporator for freezing room are connected to an outlet pipe of the wall surface cooling pipe,
The refrigerator according to any one of claims 1 to 4, further comprising the freezer compartment blower that sends cool air from the freezer compartment evaporator to the freezer compartment. A refrigerator compartment evaporator is connected in parallel with the refrigerator compartment evaporator and the wall surface cooling pipe,
The refrigerator according to any one of claims 1 to 4, further comprising the freezer compartment blower that sends cool air from the freezer compartment evaporator to the freezer compartment.

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