JPH10153374A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the temperature of a refrigerating compartment and a specific low temperature compartment arranged to the inside of a refrigerating compartment formed inside a thermally insulated cabinet body by an indirect cooling system with an air duct specification being provided with a blower and a chilled air blowout duct in the specific low temperature compartment arranged to the inside of the refrigerating compartment formed inside a thermally insulated cabinet body. SOLUTION: Chilled air cooled by an evaporator 17 is conducted to the chilled air blowout duct 16 with a blower 18 and cools the inside of the refrigerating compartment 14 in a refrigerator arranged with the specific low temperature compartment 19 in front of the evaporator 17. The temperature inside the specific low temperature compartment 19 can be kept uniform by controlling a damper device 21 that adjust airflow with the opening and closing of a specific low temperature compartment duct 20 and a flap 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having a specific low-temperature room in a refrigerator room.

[0002]

2. Description of the Related Art In recent years, one-door refrigerators employ a direct cooling system in which refrigerant pipes are disposed inside an inner box for cooling, and a specific low-temperature portion having a fixed constant cooling temperature is provided inside the refrigerator. For this purpose, a structure is employed in which the cooling performance is enhanced by partially increasing the arrangement.

[0003] As a conventional one-door refrigerator, Japanese Patent Publication No.
No. 3,368,631.

A conventional one-door refrigerator will be described below with reference to the drawings. FIG. 7 is a sectional view of a conventional one-door refrigerator. In FIG. 7, 1 is a door, 2 is an inner box made of plastic, 3 is an outer box, and a heat insulating material 4 is filled between the inner box 2 and the outer box 3, and a compressor 5 is provided below.

[0005] A substantially horizontal step 6 is provided at the bottom of the inner box 2.
The heat insulating material 4 is also filled in the inside of the stepped portion 6, and a pipe 7 for a refrigerant for ice making is arranged on the inner surface. Projection 2 to hold down
c is formed by bulging the inner wall portion 2a of the inner box 2.

[0006] A refrigerant pipe 8 for normal cooling is also arranged on the vertical inner wall 2a. As shown in FIG. 8, details of how to install the refrigerant pipes 7 and 8 in the inner box 2 are shown in FIG. 8. The refrigerant pipes 7 and 8 are fitted into the concave grooves 2 b formed in the inner box 2 and The structure is such that the sheet 9 is covered to prevent the heat insulating material 4 from entering between the pipes 7 and 8 and the inner box 2 to increase the heat transfer efficiency. In addition, the step portion 6 is inclined slightly lower on the back side, and the drain pipe 10 for defrosting is taken out from the back side, and the drain is guided to a drain tray 11 disposed above the compressor 5 to heat the compressor 5. To be dissipated.

The operation of the one-door refrigerator configured as described above will be described below.

First, if the ice tray A is placed on the step 6 and cooled in the above-described one-door refrigerator, the ice tray can be cooled sufficiently because the bottom of the ice tray is in direct contact with the cooler. is there.

The stepped portion 6 on which the refrigerant pipe 7 is disposed
Since the upper surface of the plate has irregularities as shown in FIG. 5 described above, the ice tray placed thereon is unstable. However, when the ice tray is pushed inward, the protrusion 2c formed by expanding the inner box becomes Since the projection 2c and the upper surface of the step portion 6 have a slight elasticity, the upper edge of the ice tray is pressed downward as if the ice tray is clipped, thereby stabilizing the ice tray.

[0010]

However, in the above-described conventional configuration, the temperature in the refrigerator near the inner wall 2a of the inner box 2 is:
Since it is in direct contact with the refrigerant pipe 8, it is excessively cooled. On the other hand, the temperature inside the refrigerator near the door 1 side is cooled by heat transfer due to a temperature difference from the temperature inside the refrigerator near the back wall portion 2a, so that it takes a very long time to stabilize. Was also uneven. The same applies to the temperature range of the ice tray A. Since the bottom portion directly in contact with the refrigerant pipe 7 is excessively cooled, the entire temperature inside the ice tray A tends to be uneven, and It was extremely difficult to control the temperature at a constant set temperature and cool it. Moreover, it is essential that the ice tray A is in contact with the step 6.
In order to install the cooling pipe in an arbitrary space in the refrigerator, there is a problem in a method of arranging a cooling pipe and cooling the pipe.

An object of the present invention is to solve the conventional problem, and an object of the present invention is to provide a refrigerator of an indirect cooling system capable of controlling the temperature of a specific low-temperature room installed in an arbitrary space in a refrigerator constantly and uniformly. I do.

[0012]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention uses a direct cooling system, which is a cooling method for a one-door refrigerator, as an indirect cooling system comprising an evaporator, a blower, and a cool air discharge duct. Things. Moreover, the refrigerator is provided with a damper device for adjusting the air volume by opening and closing the specific low-temperature chamber duct and the flap dedicated to the specific low-temperature room.

[0013] Thus, the temperature in the refrigerator compartment is quickly stabilized because the cold air circulates, and is kept constant without any unevenness. Further, the temperature in the specific low-temperature room installed in the refrigerator is also stabilized quickly due to the circulation of the cool air, and the constant set temperature can always be kept uniform by the air volume control of the damper device.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a heat-insulating housing made of a heat-insulating material, a refrigerator formed in the heat-insulating housing, an evaporator of a refrigeration cycle for cooling the refrigerator, and an evaporator. A cooler circulation blower provided above the air conditioner, a cooler room including the evaporator and the blower, and a cooling chamber provided in front of the evaporator in the cooler room and partitioned by a heat insulating material. A low-temperature chamber, a cool air discharge duct extending upward from the blower and guiding cool air into the refrigerator compartment, and a specific low-temperature chamber duct branching from the cool air discharge duct and leading cool air to the specific low-temperature chamber via a front of an evaporator. And a damper device for adjusting the air volume by opening and closing a flap provided between the specific low-temperature chamber.

The cool air sent from the cool air circulating blower is guided to the cool air discharge duct and circulates the cool air in the cool room, so that the temperature distribution in the cool room is always constant and cooled uniformly. Also, in the specific low-temperature room, the damper device that adjusts the air flow by opening and closing the flap can control the temperature to a fixed set temperature, and circulates cool air through a special low-temperature room duct, so that the temperature in the specific low-temperature room is uniform It is possible to keep.

Further, the front of the evaporator is a space where the temperature is most likely to fall in the refrigerator due to the heat conduction effect of the evaporator temperature. Therefore, a specific low-temperature chamber set at a temperature lower than the refrigerator temperature is provided at this position. Thus, the temperature control of the specific low-temperature chamber can be cooled by the heat conduction effect using the heat storage of the evaporator. Therefore, when the operation of the refrigerator is stopped, the temperature in the specific low-temperature room can be kept uniform even in a state in which cool air is not supplied. In other words, in the specific low-temperature room, cooling can be performed using both cooling by cold air during refrigerator operation and cooling by heat conduction using heat storage of the evaporator when operation is stopped, so that the temperature in the refrigerator is always stabilized. It becomes possible.

[0017] Further, the cool air discharge duct is a first duct positioned in front of the blower, a second duct positioned above and extending upward from the blower, and positioned on a side of the blower. The refrigerator comprises a connection duct for connecting the first duct and the second duct, and the normal cross-sectional shape of the connection duct is a substantially triangular shape having a bottom at an upper side.

In the flow path through which the cool air sent from the blower to the first duct reaches the connection duct, the connection duct has a substantially triangular front cross-section with the upper side being the base, so that the insulating wall can be located farther from the blower. The side of the side can form a discharge duct configuration that has a cycloidal curve shape along the streamline in the centrifugal direction of the blower, so it is efficient to reduce stagnation of the air path in the discharge duct and reduce air volume loss A duct configuration can be formed.

Therefore, lubricating cold air can be supplied to the refrigerator compartment and the specific low-temperature compartment, and the temperature inside the refrigerator can be kept uniform.

[0020] Further, the refrigerator is characterized in that the lowermost part of the specific low-temperature chamber duct passes through a position lower than the height of the lower end of the opening of the damper device.

When the operation of the refrigerator is stopped, the humid air flowing back into the discharge duct tends to cause dew condensation on the inner wall of the front surface of the evaporator. Since the lowermost portion is located at a position lower than the height of the lower end of the opening of the damper device, dew water does not flow into the damper device. for that reason,
It is possible to prevent dew condensation from freezing near the damper device and prevent damper control, and it is possible to form a duct configuration that always performs accurate air volume control, so that lubricated cold air can be supplied to the specific low temperature room and the temperature in the specific low temperature room Can be kept uniform.

Further, the refrigerator is characterized in that a downwardly convex shape is added to the wall surface of the lower part of the specific low-temperature room duct on the side of the specific low-temperature room over substantially the entire width.

[0023] Even if dew water generated on the inner wall of the storage in the discharge duct flows down, the con- duct shape formed over substantially the entire width on the wall surface on the side of the specific low-temperature chamber causes a lower position than the damper device. At the bottom of the specific low-temperature chamber duct. Therefore, the dew water does not flow into the damper device, and the dew water does not freeze near the damper device and the damper cannot be controlled. As a result, it is possible to form a duct configuration for always performing accurate air volume control, so that lubricating cool air can be supplied into the specific low-temperature room, and the temperature in the specific low-temperature room can be maintained uniform.

[0024] Further, a refrigerator is characterized in that a communication hole communicating between the lowermost part of the specific low-temperature chamber duct and the lower part of the cooler chamber is provided, and the diameter of the communication hole is made sufficiently small. .

Since the dew water accumulated in the lowermost part of the specific low-temperature chamber is discharged through the communication hole, the dew water does not overflow and adhere to the damper device. As a result, it is possible to form a duct configuration for always performing accurate air volume control without dew condensation being frozen in the vicinity of the damper device and becoming unable to control the damper. Can be kept uniform.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a refrigerator according to the present invention will be described below with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description thereof is omitted.

(Embodiment 1) FIG. 1 is a sectional view of a refrigerator according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 12 denotes a heat insulating housing according to a specific embodiment of the present invention. The heat-insulating housing 12 of this embodiment has an independent refrigerator compartment 14 surrounded by a heat-insulating wall 13. Cold room 1
4, a cooler room 15 and a cool air discharge duct 16 are provided. The cooler room 15 is provided with an evaporator 17 for exclusively cooling the heat-insulating housing 12 and a blower 18 for circulating cool air above the evaporator 17. A specific low-temperature chamber 19 is arranged in front of the evaporator 17.

The cool air discharge duct 16 is connected to the blower 1
8 extends upward. The specific low-temperature room 19 is provided with a specific low-temperature room duct 20 branched from the cool air discharge duct 16 in front of the cooler room 15. Specific low-temperature room duct 2
Between 0 and the specific low-temperature chamber 19, a damper device 21 is provided. The damper device 21 is provided with a flap 22 for adjusting the air volume.

With respect to the refrigerator configured as described above,
The operation will be described below. The cool air cooled by the evaporator 17 is sent by the blower 18, guided to the cool air discharge duct 16, and discharged to the refrigerator compartment 14. The cool air discharged into the refrigerator compartment 14 cools by circulating the air inside the refrigerator compartment 14. On the other hand, a part of the cool air sent into the cool air discharge duct 16 is supplied to the specific low-temperature chamber duct 2 branched in front of the evaporator 17.
It is guided to 0 and discharged to the specific low-temperature chamber 19. The cool air discharged into the specific low temperature chamber 19 circulates the air inside the specific low temperature chamber 19 and cools. At this time, the specific low temperature chamber duct 2
It is necessary to adjust the air volume of the cool air sent to the temperature 0 so that the temperature inside the specific low-temperature chamber 19 is maintained at a constant set temperature.
Flap 2 provided in damper device 21 provided between
It is done by opening and closing 2.

Further, even when the operation of the refrigerator is stopped, the temperature of the evaporator 17 is the lowest in the refrigerator. Therefore, the specific low temperature installed in front of the evaporator 17 is provided by the heat conduction effect utilizing the heat storage of the evaporator 17. The inside of the chamber 19 is cooled.

As described above, the refrigerator of this embodiment has a refrigerator compartment 14, a cooler compartment 15, a cool air discharge duct 16, an evaporator 17, a blower 18, a specific low temperature room 19, and a specific low temperature room duct. 20 and a damper device 21, and the inside of the refrigerator compartment 14 is uniformly cooled by the cool air discharge duct 16. Further, the cool air whose air volume has been adjusted by the damper device 21 can uniformly cool the specific low-temperature room by the specific low-temperature room duct 20.

Further, even when the operation of the refrigerator is stopped, the heat conduction effect utilizing the heat storage of the evaporator 17 causes the evaporator 17 to stop operating.
The inside of the specific low-temperature chamber 19 disposed in front of the chiller is cooled.

In this embodiment, the specific low-temperature chamber 19 is used.
Is disposed in front of the evaporator 17, the temperature of the specific low-temperature chamber 19 is lower than the temperature of the refrigerator compartment 14, so that the temperature difference between the specific low-temperature chamber 19 and the cooler chamber 15 is smaller. Become. Therefore, the cooler chamber 15 in front of the evaporator 17
The inner wall of the partition can be made thin. Thereby, the effect that the volumetric efficiency of the refrigerator is improved can be obtained.

Further, since the damper device 21 for adjusting the air volume of the specific low-temperature chamber 19 is provided below the blower 18, when the refrigerator is stopped, the humid air that flows through the discharge duct 16 from the refrigerating chamber 14 and flows backward is returned. Since the air flows into the evaporator side 17 from the blower unit, it is difficult for the moist air flowing backward from the refrigerator compartment 14 to flow into the damper device 21. Therefore, it is possible to prevent the backflowing moist air from freezing in the vicinity of the damper device 21 to disable the damper control, and to form a duct configuration for always performing accurate air volume control.
Lubricated cold air can be supplied into the specific low-temperature chamber 19, and the temperature in the specific low-temperature chamber 19 can be kept uniform.

(Embodiment 2) FIG. 2 is a front view of a refrigerator cool air discharge duct according to Embodiment 2 of the present invention, and is a sectional view taken along line AA in FIG. FIG. 3 is an enlarged view of a cool air discharge duct portion in FIG. FIG. 4 is a perspective view of a cool air discharge duct portion of the embodiment. FIG. 5 is a sectional view of the cool air discharge duct taken along line BB in FIG. FIG. 6 is a cross-sectional view of the cool air discharge duct taken along the line CC in FIG.

2 to 6, in this embodiment, the cool air discharge duct 16 includes a first duct 16a located in front of the blower 18, and a second duct 16 located above the blower 18 and extending upward. 16b and a connection duct 16c located on the side of the blower 18 and connecting the first duct 16a and the second duct 16b.

First, from the first duct 16a, the cooling chamber front partitioning section 23 that partitions the front of the cooling chamber 15 will be described.
And a side wall portion 24 that abuts on an outer wall forming a side surface of the heat-insulating housing 12, and a refrigerator compartment partition 25 facing the refrigerator compartment 14, and is arranged on a front portion of the cooler compartment 15.

The second duct 16b includes a back surface portion 26 which is in contact with an outer wall forming the back surface of the heat-insulating housing 12, and the heat-insulating housing 1
2 is constituted by a side wall portion 24 abutting on an outer wall forming a side surface of the refrigerator room, a refrigerator compartment partition portion 25 facing the refrigerator compartment 14 and a cooler compartment upper partition portion 27 contacting the upper portion of the cooler compartment. Adjacent to the upper part, it is arranged on the upper rear surface of the refrigerator compartment 14.

The first duct 16a and the second duct 16b
The connection duct 16c, which is a connection portion of the refrigerator 12, has a rear surface portion 26 that comes into contact with an outer wall that forms the rear surface of the refrigerator 12, an upper surface 28 that is connected to a cooler room upper partition portion 27 of the first duct, and a blower 18 on the far side. , A side wall portion 24 abutting on an outer wall forming a side surface of the heat insulating casing 12 connected to the second duct 16b, and a side surface portion 29 on the side of the blower, and are arranged on the side of the blower 18.

The front cross-sectional shape 30 of the connection duct 16c is formed on the upper surface 2 connected to the upper compartment 27 of the cooler room of the first duct.
8 and the second duct 16
b, the side 3 on the far side of the blower 18 which is a cross-sectional shape of the side wall portion 24 which abuts on the outer wall forming the side surface of the heat insulating housing 12 connected to the side
2, and a side 33 on the side of the blower 18 which is a cross-sectional shape of the side surface portion 29 on the side of the blower 18 forms a substantially triangle having the upper side 31 as a base.

With respect to the refrigerator configured as described above,
The operation will be described below. The streamline 34 of the cool air blown from the blower 18 is discharged to the first duct 16a while drawing a cycloid curve along the centrifugal direction of the blade, and is sent to the second duct 16b via the connection duct 16c. The refrigerator compartment 14 is cooled. On the other hand, the side wall portion 24 of the first duct 16a is formed along a streamline 34 of the cool air drawn by the blower 18 and drawing a cycloid curve. At this time, the side wall 24 of the first duct 16a and the connection duct 16
Since the side wall portion 24c is connected, the streamline 34 of the cool air drawn from the blower 18 and drawing a cycloid curve is sent into the second duct 16b in a state where the air passage resistance by the side wall portion 24 does not occur.

As described above, since the cool air discharge duct 16 of the refrigerator of the present embodiment is formed without impairing the cycloid curve drawn in the centrifugal direction from the blower 18, no extra air path resistance is generated. Therefore, there is no loss of air volume in the cool air discharge duct 16, and an efficient air path configuration can be achieved. Thereby, the temperature inside the refrigerator compartment 14 and the temperature inside the specific low-temperature compartment 19 can always be controlled uniformly by an efficient air path configuration.

The side 33 on the blower side and the upper side 31
By setting the inner angle of the fan to an acute angle, the blade diameter of the blower 18 can be maximized. As a result, in order to secure the required air volume, the blade diameter and the rotational speed are in inverse proportion to each other. Therefore, if the blade diameter is increased, the rotational speed can be reduced. For this reason, it is possible to prevent the wind noise from the blower 18 and to obtain the effect of reducing the noise of the refrigerator.

(Embodiment 3) FIG. 6 is a sectional view taken along line CC of FIG. 2 of a refrigerator discharge duct according to Embodiment 3 of the present invention.

In FIG. 6, reference numeral 35 denotes a specific low-temperature chamber duct 2
0, which is located below the opening 36 of the damper device 21. 37 has a downwardly convex shape and is formed over substantially the entire width of the wall surface of the refrigerator compartment partition 25 below the specific low-temperature compartment duct 20. A communication hole 38 having a sufficiently small diameter is provided in the lowermost part 35 of the specific low-temperature chamber duct, and communicates with a space between the lower part 39 of the cooler chamber.

Regarding the refrigerator configured as described above,
The operation will be described below. As in the present embodiment, in the refrigerator of the indirect cooling type, when the operation of the refrigerator is stopped, the humid air in the refrigerator compartment flows back into the cool air discharge duct 16, and the inside surface of the cool air discharge duct 16 that has been cooled during the operation of the refrigerator Due to the difference in temperature between the above and the above, dew condensation occurs on the inner surface of the cool air discharge duct 16 and flows as dew condensation water and flows downward.

Further, when the door of the heat insulating casing 12 is half closed and a gap occurs between the door and the outside air, or when the door is frequently opened and closed during a high humidity period such as the rainy season, a large amount of moisture enters the inside of the refrigerator. Intrudes into the cool air discharge duct 16 through the opening of the cool air discharge duct 16, is rapidly cooled by the cool air in the cool air discharge duct 16, forms dew condensation, and freezes on the inner surface of the cool air discharge duct 16, causing frost. Become. Thereafter, when the evaporator 17 is being defrosted, warm air for melting the frost of the evaporator 17 flows into the cool air discharge duct 16, and the frost on the inner surface of the cool air discharge duct 16 melts due to the warm air, and condensed water is condensed. It becomes a stream and flows down.

When the condensed water flows down along the inner surface of the cool air discharge duct 16 and adheres to the damper device 21 attached to the lower side, the condensed water is cooled and frozen during the operation of the refrigerator. Damper device 21
Cannot be controlled, and the temperature in the specific low-temperature chamber 19 cannot be controlled.

A specific site for such a phenomenon will be described. First, the cooler compartment front partition 23 will be described. Since the cooler room front partition 23 is located in front of the evaporator 17, the surface temperature is the lowest and dew condensation is likely to occur. The condensed water generated on the surface of the cooler room front partition 23 flows down the cooler room front partition 23 and flows down. The condensed water that has flowed downward accumulates in the lowermost portion 35 of the specific low-temperature chamber duct 20, which is the lowermost portion of the airflow configuration.

On the other hand, the dew water adhering to the refrigerator compartment partition 25 flows down the refrigerator compartment partition 25 and flows down. The condensed water that has flowed downward drops and accumulates on the lowermost portion 35 of the specific low-temperature chamber duct 20 due to the downwardly convex shape 37 formed over substantially the entire width of the wall of the refrigerator compartment partition 25.

The cooler room front partition 23 and the refrigerator compartment partition 2
5, the condensed water that has flowed down and accumulated in the lowermost portion 35 of the specific low-temperature chamber duct 20 passes through a communication hole 38 communicating with a cooler chamber lower portion 39 formed in the lowermost portion 35 of the specific low-temperature room duct 20. Then, it flows down to the lower part 39 of the cooler room.

As described above, in the refrigerator air path configuration of the indirect cooling system, the dew water generated inside the cool air discharge duct 16 is separated from the cooler room front partition 23 and the refrigerator compartment partition 25.
And flows into the lowermost portion 35 of the specific low-temperature chamber duct 20. However, the lowermost portion 35 of the specific low-temperature chamber duct 20
Is located below the opening 36 of the damper device 21, so that the accumulated dew water does not adhere to the damper device 21 and freeze. Further, the condensed water accumulated in the lowermost portion 35 of the specific low-temperature room duct 20 is discharged into the lower portion 39 of the cooler room by the communication hole 38 provided in the lowermost portion 35 of the specific low-temperature room duct 20, so that the specific low-temperature room duct Condensed water accumulated in the lowermost portion 35 of 20 does not overflow and adhere to the damper device 21. Accordingly, the damper device 21 can be prevented from freezing, and the damper control due to the dew condensation water can be prevented from being disabled, and a duct configuration for always performing accurate air volume control can be formed. Cold air can be supplied, and the temperature in the specific low-temperature chamber 19 can be kept uniform.

The lowermost portion 35 of the specific low-temperature chamber duct 20
The communication hole 38 provided in the evaporator 17 is provided at the substantially center of the cooler chamber 15 to communicate between the lower portions of the cooler chamber.
There is no leakage of cold air in the vicinity, and the cooling performance of the evaporator 17 is not adversely affected. Furthermore, the communication hole 38
Is small enough to prevent cold air in the specific low-temperature room duct 20 sent from the blower 18 from returning directly to the cooler room 15 without being sent to the specific low-temperature room 19, so that the specific low-temperature room duct 20 There is no loss of air flow in the interior, and the efficiency in the specific low-temperature chamber duct 20 is not impaired.

[0055]

As described above, the present invention provides a heat-insulating housing made of heat-insulating material, a refrigerating room formed in the heat-insulating housing, and an evaporator of a refrigerating cycle for cooling the refrigerating room. A blower for circulating cool air disposed above the evaporator, a cooler room including the evaporator and the blower, and a heat insulating material disposed in front of the evaporator in the cooler room. A specified low-temperature chamber, a cool air discharge duct extending upward from the blower and guiding cool air into the refrigerator compartment, a branch branched from the cool air discharge duct, and passing cool air to the specific low temperature chamber via a front of an evaporator. The refrigerator is provided with a damper device for adjusting the air volume by opening and closing a flap provided between the low-temperature chamber duct and the specific low-temperature room.

Then, the cool air sent from the cool air circulation blower is guided to the cool air discharge duct and circulates the cool air in the cool room, so that the temperature distribution in the cool room is always constant and is cooled uniformly. Also, in the specific low-temperature room, the damper device that adjusts the air flow by opening and closing the flap can control the temperature to a fixed set temperature.Moreover, cool air is circulated through the specific low-temperature room duct, so that the temperature in the specific low-temperature room is kept uniform. Becomes possible.

Furthermore, the front of the evaporator is the space where the temperature is most likely to fall in the refrigerator due to the heat conduction effect of the evaporator temperature. Therefore, a specific low-temperature chamber set at a temperature lower than the refrigerator temperature is provided at this position. Accordingly, the temperature control of the specific low-temperature room can be cooled by the heat conduction effect using the heat storage of the evaporator, so that when the operation of the refrigerator is stopped, the temperature in the specific low-temperature room is stabilized even when no cool air is supplied. It becomes possible.

Since the temperature zone of the specific low-temperature room is set lower than the temperature zone of the refrigerator room, the temperature difference between the specific low-temperature room and the inside of the evaporator is calculated from the temperature difference between the refrigerator room and the inside of the evaporator. Therefore, by providing a specific greenhouse in front of the evaporator, the inner wall in front of the evaporator can be made thinner, and the volumetric efficiency can be improved.

Further, the damper device for adjusting the air volume in the specific low-temperature room is disposed below the blower, so that when the refrigerator is stopped, the moist air transmitted through the discharge duct from the refrigerating room and flowing backward is evaporated from the blower unit. Therefore, it is difficult for the humid air that has flowed back from the refrigerator to flow into the damper device. Therefore, it is possible to prevent the backflowing moist air from freezing near the damper device to prevent damper control, and to form a duct configuration for always performing accurate air volume control, so that lubricating cold air can be supplied to a specific low-temperature room, The temperature inside the specific low-temperature room can be kept uniform.

Further, the cool air discharge duct includes a first duct positioned in front of the blower, a second duct positioned above and extending upward from the blower, and the second duct positioned on a side of the blower. The refrigerator comprises a connection duct for connecting the first duct and the second duct, and the front cross-sectional shape of the connection duct is a substantially triangular shape having an upper side as a bottom side.

In the flow path through which the cool air sent from the blower to the first duct reaches the connecting duct, the connecting duct has a substantially triangular front cross section with the upper side being the base, so that the insulating wall can be located farther from the blower. The side of the side can form a discharge duct configuration that has a cycloidal curve shape along the streamline in the centrifugal direction of the blower, so it is efficient to reduce stagnation of the air path in the discharge duct and reduce air volume loss Since a duct configuration can be formed, lubricating cold air can be supplied to the refrigerator compartment and the specific low-temperature compartment, and the temperature inside the refrigerator can be kept uniform.

Further, the side of the blower on the other side is formed by making the inner angle with the upper side which is the base of the substantially triangle a sharp angle.
Since the blade diameter of the blower can be maximized, the number of rotations for producing a required air volume can be suppressed, and wind noise can be prevented, so that noise can be reduced.

Further, the refrigerator is characterized in that the lowermost part of the specific low-temperature chamber duct passes through a position lower than the height of the lower end of the opening of the damper device.

When the operation of the refrigerator is stopped, the humid air flowing back into the discharge duct tends to cause dew condensation on the inner wall of the front surface of the evaporator. Since the lowermost portion is located at a position lower than the height of the lower end of the opening of the damper device, dew water does not flow into the damper device. for that reason,
It is possible to prevent dew condensation from freezing near the damper device and become uncontrollable, and it is possible to form a duct configuration that always performs accurate air volume control, so that lubricating cold air can be supplied into the specific low-temperature room and the temperature in the specific low-temperature room can be reduced. It can be kept uniform.

Further, the refrigerator is characterized in that a downwardly convex shape is added to the wall surface of the lower part of the specific low-temperature room duct on the side of the specific low-temperature room over substantially the entire width.

Even when dew condensation water generated on the inner wall of the inside of the storage chamber in the discharge duct flows down, the specific low-temperature chamber duct is formed by the downwardly convex shape formed over substantially the entire width on the specific low-temperature chamber side wall surface. Drops at the bottom and accumulates at the bottom of the specific low-temperature chamber duct. Therefore, the dew water does not flow along the refrigerator compartment partition into the damper device, and the dew water does not freeze near the damper device to become uncontrollable. As a result, it is possible to form a duct configuration for always performing accurate air volume control, so that lubricating cool air can be supplied into the specific low-temperature room, and the temperature in the specific low-temperature room can be maintained uniform.

Further, a refrigerator is characterized in that a communication hole communicating between the lowermost part of the specific low-temperature chamber duct and the lower part of the cooler chamber is provided, and the diameter of the communication hole is sufficiently reduced. .

Since the dew water accumulated in the lowermost part of the specific low-temperature chamber is discharged through the communication hole, the dew water does not overflow and adhere to the damper device. As a result, it is possible to form a duct configuration for always performing accurate air volume control without dew condensation being frozen in the vicinity of the damper device and becoming unable to control the damper. Can be kept uniform.

Further, since the communication hole communicates between the lower portions of the cooler chambers, there is no possibility that the cool air leaks near the evaporator which is installed substantially at the center of the cooler room, and the cooling performance of the evaporator does not increase. Has no adverse effect. Furthermore, since the diameter of the communication hole is sufficiently small, it is possible to prevent the cool air in the specific low-temperature room duct sent from the blower from returning directly to the cooler room without being sent to the specific low-temperature room. There is no loss of air volume in the interior, and there is no loss in efficiency in the specific low-temperature chamber duct.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of a refrigerator according to the present invention.

FIG. 2 is a front sectional view of the cool air discharge duct taken along line AA in FIG. 1;

FIG. 3 is a sectional view of a main part of the cool air discharge duct in FIG. 2;

FIG. 4 is a perspective view of a cool air discharge duct of the present invention.

FIG. 5 is a sectional view taken along line BB of the cool air discharge duct in FIG. 2;

FIG. 6 is a cross-sectional view of the cold air discharge duct taken along line CC in FIG. 2;

FIG. 7 is a cross-sectional view of a conventional refrigerator.

8 is a cross-sectional view of a main part of the mounting of the refrigerant pipe in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Insulated housing 14 Refrigerator room 15 Cooler room 16 Cold air discharge duct 16a First duct 16b Second duct 16c Connection duct 17 Evaporator 18 Blower 19 Specific low-temperature room 20 Specific low-temperature room duct 21 Damper device 22 Flap 30 Front section Shape 35 Lowermost part of specific low-temperature room duct 36 Opening 37 Shape convex downward 38 Communication hole 39 Lower part of cooler room

Claims (5)

[Claims] 1. A heat insulating casing made of a heat insulating material, a refrigerator formed in the heat insulating casing, an evaporator of a refrigeration cycle for cooling the refrigerator, and an evaporator disposed above the evaporator. A blower for circulating cool air, a cooler room including the evaporator and the blower, a specific low-temperature room provided in front of the evaporator in the cooler room and partitioned by a heat insulating material, and the blower A cold air discharge duct that extends upward from above and guides cool air into the refrigerated room, between the specific low temperature room duct and the specific low temperature room that branches off from the cool air discharge duct and passes cool air to the specific low temperature room through the front of the evaporator. A refrigerator provided with a damper device that adjusts the air flow by opening and closing a flap provided in the refrigerator. 2. A cool air discharge duct, comprising: a first duct located in front of the blower; a second duct located above and extending upward from the blower; and the first duct located laterally to the blower. The refrigerator according to claim 1, comprising a connection duct for connecting the duct and the second duct, wherein the front cross-sectional shape of the connection duct is a substantially triangular shape having an upper side as a base. 3. The refrigerator according to claim 1, wherein the lowermost part of the specific low-temperature chamber duct passes through a position lower than the height of the lower end of the opening of the damper device. 4. The refrigerator according to claim 3, wherein a shape projecting downward over substantially the entire width is added to a wall surface on the specific low-temperature room side below the specific low-temperature room duct. 5. The refrigerator according to claim 3, wherein a communication hole communicating between the lowermost part of the specific low-temperature chamber duct and the lower part of the cooler chamber is provided, and the diameter of the communication hole is made sufficiently small.