JPH08247622A - Refrigerator - Google Patents

Abstract

PURPOSE: To make an evaporator thin and improve space efficiency. CONSTITUTION: Cold air is produced in a condenser chamber 14, and the cold air is fed from the condenser chamber 14 to a refrigeration chamber and a freezing chamber. The cold air containing a little amount of water in the freezing chamber is returned to the condenser chamber 14 through an opening 31b and heat-exchanged with a freezing chamber evaporator 22 having dense fin pitch for effective cooling. The cold air containing a large amount of water in the refrigeration chamber is returned into the condenser chamber 14 through an opening 32b and heat-exchanged with a refrigeration chamber evaporator 21 having wide fin pitch and hence deposited on the refrigeration chamber evaporator 21. Accordingly, the cooling efficiency of cold air due to an evaporator 26 is improved and hence the evaporator 26 is made thinner to improve the space efficiency of the refrigerator.

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 structure in which cold air generated in a cooler chamber is circulated so as to return from the refrigerating chamber and the freezing chamber to the cooler chamber.

[0002]

2. Description of the Related Art As a refrigerator, as shown in FIG. 13, there is provided a comptop refrigerator in which a refrigeration cycle unit 2 is arranged on an upper surface of a refrigerator body 1. In the case of this configuration, the refrigeration cycle unit 2 has a cooler chamber 3 inside.
Further, the machine room 4 is formed, the cooler 3a of the refrigeration cycle is housed in the cooler room 3, and when the refrigeration cycle / cooling fan device operates, the cold air generated in the cooler room 3 is cooled by the cold air supply duct. Is supplied to the refrigerating room and the freezing room in the refrigerator main body 1 to cool the inside of the refrigerator, and then returned from each room to the cooler room 3 through the cool air return duct 5.

FIG. 14 shows a conventional structure of the cooler 3, and reference numeral 6a indicates R return air (arrow R from the refrigerating chamber).
R), the reference numeral 6b is an F cold airflow inlet from which the F return air (shown by the arrow F) from the freezer compartment is blown out. In the case of this configuration, the fin pitch P of the upstream portion of the cooler 3a is set to be larger than that of the remaining portion, which corresponds to the R return air having a large water content, and prevents the frosted deterioration of the cooler 3a. .

[0004]

However, in the above-mentioned conventional structure, the fin pitch P in the upstream portion of the cooler 3a is large, so that the cooler 3a is upsized because of the need to secure a cooling area. Therefore, the space efficiency of the refrigerator is deteriorated, and it is difficult to commercialize the refrigerator cycle unit 2 especially in the form in which the external appearance of the refrigeration cycle unit 2 is conspicuous. Moreover, if the refrigerator body 1 and the refrigeration cycle unit 2 are configured within a predetermined product height (a value that is restricted due to installation space and physical distribution problems), there is a problem that the internal volume of the refrigerator body 1 is reduced.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a refrigerator capable of improving space efficiency with the downsizing of a cooler.

[0006]

According to a first aspect of the present invention, there is provided a refrigerator in which a cooler for a refrigerating cycle is housed and which produces cool air to be supplied to the refrigerating room and the freezing room. A first cold airflow inlet for returning cold air in the refrigerating chamber to the cooler chamber, and a second cold airflow inlet provided in the cooler chamber for returning cold air in the freezing chamber to the cooler chamber, The cooler includes a first cooler that cools the cold air that has flowed in from the first cold airflow inlet and a second cooler that cools the cool air that has flowed in from the second cold airflow inlet. It is characterized in that the fin pitch of the second cooler is set smaller than the fin pitch of the upstream portion of the cool air flow in the first cooler.

According to a second aspect of the present invention, there is provided a refrigerator including a refrigerating room, first
The first cold air return duct for supplying cold air to the cold air flow inlet and the second cold air return duct for supplying cold air from the freezing chamber to the second cold air flow inlet are characterized. The refrigerator according to claim 3 has a first cooler and a second cooler.
Is characterized in that the cooler chamber is provided with a cool air discharge port for supplying the cool air passing through the cooler to the refrigerating chamber and the freezing chamber.

According to another aspect of the present invention, there is provided a refrigerator in which a cooler is housed and which produces cold air to be supplied to the refrigerating chamber and the freezing chamber, and which is provided in the refrigerating chamber and the freezing chamber. A cooler air inlet for returning cool air to the cooler chamber, wherein the cooler is located on the upstream side of the cool air flow flowing from the cool air inlet, and a downstream side of the first cooler. Characterized in that the fin pitch of the second cooler is set to be smaller than the fin pitch of the upstream portion of the cold air flow in the first cooler. .

According to a fifth aspect of the refrigerator, there is provided a first heat source for removing frost adhering to the first cooler, a second heat source for removing frost adhering to the second cooler, and the first heat source. And a heat generation control means for controlling heat generation of the second heat source, and the heat generation control means is configured to heat the first heat source for each cycle of the compressor. The refrigerator according to claim 6 is characterized in that the heat generation control means is configured to heat the second heat source for a predetermined time.

A refrigerator according to a seventh aspect is characterized in that the first cooler and the second cooler are arranged horizontally. The refrigerator according to claim 8 is characterized in that the refrigeration cycle is arranged at the upper part of the refrigerator body. The refrigerator according to claim 9 is characterized in that the U bend portion of the first cooler and the U bend portion of the second cooler are displaced.

[0011]

When the cool air is generated in the cooler chamber, the cool air is supplied from the cooler chamber to the refrigerating chamber and the freezing chamber. Then, the cold air in the freezing chamber (having a small amount of water content) flows into the cooler chamber through the second cold airflow inlet, passes through the second cooler having a fine fin pitch, and exchanges heat.

Further, the cold air (having a large water content) in the refrigerating chamber flows into the cooler chamber through the first cold airflow inlet and exchanges heat with the first cooler having a wide fin pitch. At this time, the moisture in the returning cool air frosts on the first cooler. Therefore, the cold air in the freezer compartment and the cold air in the refrigerator compartment exchange heat with the second and first coolers, respectively, and particularly the cold air in the freezer compartment at a low temperature is
Although it passes through the second cooler, which has a high fin pitch density and a high heat exchange capacity, it has a low water content and a small amount of frost,
Even if the fin pitch is dense, there is no problem and the cooling efficiency of the cooler is improved, so that the cooler is downsized, and as a result, the space efficiency of the refrigerator is improved.

According to the second aspect, the cold air in the refrigerating compartment is supplied to the first cold airflow inlet from the independent first cool air return duct and exchanges heat with the first cooler. Further, the cold air in the freezing compartment is supplied to the second cold airflow inlet from the independent second cold air return duct and exchanges heat with the second cooler. Therefore, the cool air in the refrigerating chamber and the cool air in the freezing chamber can be clearly distinguished and returned to the cooler, so that the cooling efficiency of the cool air by the cooler is further improved.

According to the third aspect of the present invention, the cool air that has passed through the first cooler and the cool air that has passed through the second cooler flow into the cool air discharge port and pass through the cool air discharge port into the freezer compartment and the refrigerating compartment. Supplied. Therefore, as compared with the case where a separate cool air discharge port is provided for the cool air passing through each cooler, the space occupied by the cool air discharge port is reduced. Moreover, the cool air having a high temperature passing through the first cooler and the cool air having a low temperature passing through the second cooler can be mixed to generate cool air having a proper temperature.

According to the fourth aspect, when the cool air is generated in the cooler chamber, the cool air is supplied from the cooler chamber to the refrigerating chamber and the freezing chamber. Then, the cold air in the freezing chamber and the cold air in the refrigerating chamber flow into the cooler chamber through the cold airflow inlet, first exchange heat with the first cooler having a wide fin pitch, and after frost formation on the first cooler, Heat is exchanged with the second cooler having a narrow fin pitch. Therefore, the cooling efficiency of the cool air by the cooler is improved, so that the cooler is downsized, and as a result, the space efficiency of the refrigerator is improved.

According to the means of claim 5, the frost adhering to the first cooler is melted as the first heat source generates heat, and the second cooling is carried out as the second heat source generates heat. The frost adhering to the vessel is melted. In addition, the first heat source generates heat in each cycle of the compressor, and the first cooler that easily forms frost is defrosted every time. Therefore, the frosting deterioration of the first cooler is prevented, and the cooling efficiency is also improved.

According to the sixth aspect of the present invention, the second heat source generates heat for a predetermined time, and the second cooler which is hard to be frosted is defrosted at intervals. Therefore, the second cooler is prevented from being inadvertently heated, and the cooling efficiency is further improved. According to the means of claim 7, the first cooler and the second cooler are arranged in the horizontal direction. Therefore, the thickness of the cooler is reduced as compared with the case where the first cooler and the second cooler are arranged vertically.

According to the eighth aspect of the present invention, the refrigeration cycle is arranged at the upper part of the refrigerator body. Therefore, since the present invention is applied to a comp top refrigerator, the above-described thinning of the cooler becomes extremely advantageous in developing the product. According to the means described in claim 9, the U bend portion of the first cooler and the U bend portion of the second cooler are misaligned. Therefore, the second cooler is placed between the U-bend parts of the first cooler.
The U-bend portion of the cooler is inserted, and as a result, the width dimension of the cooler is reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
It will be described based on 1. First, in FIG. 5, the refrigerator main body 11 has a box shape with an open front surface, and a steel plate outer box 11b is combined with an outer side of the synthetic resin inner box 11a,
A heat insulating material 11c such as urethane foam is injected and foamed and filled between the inner box 11a and the outer box 11b.

A refrigerating compartment 11e, a freezing compartment 11g and a vegetable compartment 11h are formed in this order from the upper side in the interior 11d of the refrigerator body 11. The refrigerator compartment 11e, the freezer compartment 11g, and the vegetable compartment 11h are formed by partitioning the interior 11d with a partition wall 11i, and the front opening of the refrigerator compartment 11e is pivotally supported by the refrigerator body 11. It is covered by the door 12a. The freezer compartment 11g is covered with doors 12b and 12c that close the front opening of the refrigerator main body 11, and the vegetable compartment 11h is covered with a door 12d that closes the front opening of the refrigerator main body 11. In addition, refrigerating room 11e
A chilled chamber 11f is provided at the bottom inside.

The doors 12b, 12c and 12d have a container 11
k, 11m, 11n are provided, and each container 11k, 11
Rail members (not shown) are provided on the side surfaces of m and 11n. Each rail member is supported by the inner wall of the refrigerator body 11 so as to be freely drawn out. Therefore, the door 12b-
When 12d is pulled out, the containers 11k, 11m and 11n are pulled out together with the doors 12b, 12c and 12d.

A box-shaped refrigeration cycle unit 13 is provided on the upper surface of the refrigerator main body 11. As shown in FIG. 1, the heat insulation wall 1 is provided on the right side of the refrigeration cycle unit 13.
A cooler chamber 14 surrounded by 4a is formed, and a machine chamber 15 is formed on the left side. And in the machine room 15,
Compressor 17 and condenser 1 of the refrigeration cycle 16
8, a dryer 19 (see FIG. 4), a capillary tube 20 (see FIG. 4) are housed, and a refrigerator compartment evaporator 21 and a second refrigerator corresponding to the first cooler are provided in the cooler room 14. A corresponding freezer evaporator 22 is housed.

The compressor 17, the condenser 18, the dryer 19, and the capillary tube 2 of the refrigeration cycle 16
0, the refrigerator compartment evaporator 21, and the freezer compartment evaporator 22 are connected in a closed loop as shown in FIG. 4, and cold air is generated as the refrigerant circulates in the refrigeration cycle 16. Further, a gas-liquid separator 23 is connected between the refrigerator compartment evaporator 21 and the freezer compartment evaporator 22. This gas-liquid separator 23 is a compressor 17
The refrigerant that has passed through the refrigerator compartment evaporator 21 is gas-liquid separated by the gas-liquid separator 23, and the separated gaseous refrigerant is returned to the compressor 17.

FIG. 2 shows a refrigerator compartment evaporator 21 and a freezer compartment evaporator 22. As shown in the figure, the refrigerator compartment evaporator 21 and the freezer compartment evaporator 22 are constituted by fixing a plurality of plate-like fins 25a and 25b to pipes 24a and 24b forming a refrigerant flow path, respectively. Pipes 24a and 24b
Is formed in a meandering shape having a plurality of U bend portions 24a 'and 24b'. The refrigerator 21 evaporator 21 and the freezer evaporator 22 are, as shown in FIGS. 2 and 3, U-bend portions 24a ′ and 24b ′.
So as not to overlap with each other, they are arranged in a state of being displaced in the refrigerant flow direction (vertical direction in FIG. 2). Reference numeral 26 in FIG. 2 indicates an evaporator (corresponding to a cooler) composed of a refrigerator compartment evaporator 21 and a freezer compartment evaporator 22.

On the back heat insulating wall 11j of the refrigerator main body 11,
As shown in FIG. 6, a cold air duct 27 extending in the left-right direction is provided. A cold air outflow duct 28 is embedded in the upper wall of the refrigerator main body 11 and the bottom wall of the cooler chamber 14. This cold air outflow duct 28, as shown in FIG.
The cool air blowing port 28a corresponding to the cool air discharge port is provided in the cooler chamber 14.
Of the cold air outlet (not shown) to the cold air duct 27.

As shown in FIG. 7, a cooling fan unit 29 is housed in the cold air duct 27 at the right end thereof. This cooling fan device 29 is an axial fan 29.
a, a cooling fan motor 29b, and a casing 29c. The center line α1 is arranged so as to coincide with the center line α2 of the evaporator 26 (see FIG. 2). Then, when the cooling fan device 29 operates,
The cool air inside the cooler chamber 14 is sucked into the cool air duct 27 from the cool air blowing port 28 a through the cool air outflow duct 28.

On the back heat insulation wall 11j of the refrigerator body 11,
As shown in FIG. 6, the R cool air duct 30a is embedded at the center of the R cold air duct 30a. This R cold air duct 30a is
The cold air that has communicated with the cold air duct 27 and the cold storage chamber 11e and flows into the cold air duct 27 is supplied from the R cold air duct 30a into the cold storage chamber 11e. Also, the refrigerator body 11
An F cold air duct 30b is embedded in the back heat insulating wall 11j at the left side thereof. This F cold air duct 30b
Communicates with the cold air duct 27 and the freezer compartment 11g,
The cool air that has flowed into the cool air duct 27 is the F cool air duct 30.
It is supplied from b to the freezer compartment 11g.

On the back heat insulating wall 11j of the refrigerator main body 11,
A T cool air duct 30c is buried at a position slightly left of the central portion. The T cool air duct 30c communicates with the cool air duct 27 and the chilled chamber 11f, and
The cool air flowing into the inside 7 is supplied to the chilled chamber 11f from the T cool air duct 30c. Further, an R / V cold air duct 30d leading to the refrigerator compartment 11e and the vegetable compartment 11h is provided on the back heat insulating wall 11j of the refrigerator body 11, and the cold air supplied to the refrigerator compartment 11e and the chilled compartment 11f is R / V.
It is supplied to the vegetable compartment 11h through the V cold air duct 30d.

An F cold air return duct 31 is embedded in the back heat insulating wall 11j of the refrigerator body 11 and the heat insulating wall 14a of the cooler chamber 14 at the right end thereof. This F
The cold air return duct 31 corresponds to a second cold air return duct, and one opening 31a has a freezing chamber 11g.
Inside, and as shown in FIG. 1, the other opening 31b corresponding to the second cold airflow inlet is located on the front right side of the cooler chamber 14. Then, the cold air supplied to the freezer compartment 11g is sucked into the F cool air return duct 31 through the opening 31a of the F cool air return duct 31, returned to the inside of the cooler room 14 through the opening 31b, and then the evaporator 22 for the freezer compartment. Heat is exchanged. The arrow A in FIGS. 1 and 2 indicates the flow direction of the F return air returned from the opening 31b of the F cool air return duct 31 into the cooler chamber 14.

As shown in FIG. 6, the back heat insulating wall 11j of the refrigerator main body 11 and the heat insulating wall 14a of the cooler chamber 14 are
Located on the right side of the center, V cold air return duct 3
2 is buried. The V cold air return duct 32 corresponds to the first cold air return duct, one opening 32a is located in the vegetable compartment 11h, and the other one corresponding to the first cold airflow inlet is shown in FIG. 32b is located on the front left side of the cooler chamber 14. The cold air supplied to the vegetable compartment 11h is V cold air return duct 3
After being sucked into the V-cooled air return duct 32 through the second opening 32a and returned into the cooler chamber 14 through the opening 32b, heat is exchanged with the refrigerator compartment evaporator 21. 1 and 2, the arrow B indicates the opening 3 of the V cold air return duct 32.
2b shows the flow direction of R return air returned from 2b into the cooler chamber 14.

In this case, the refrigerator compartment 11e and the chilled compartment 11
f. Since the R return air returned from the vegetable compartment 11h contains a relatively large amount of water, the refrigerator compartment evaporator 22 to which the R return air is sprayed is likely to frost. Therefore, FIG.
As shown in, the fins 25 of the refrigerator compartment evaporator 21
The mutual pitch Pr of the a is set to be gradually smaller from the upstream side to the downstream side in order to widen the upstream side of the R return air and prevent clogging due to frost. Incidentally, R
The fin pitch on the upstream side of the return air (the front part of the refrigerator compartment evaporator 21) is Pr1, and the refrigerator compartment evaporator 2 is provided.
If the fin pitch at the center of 1 is Pr2 and the fin pitch on the downstream side of the R return air (at the rear of the refrigerator compartment evaporator 21) is Pr3, the relationship "Pr1>Pr2>Pr3" is established.

On the other hand, since the freezing compartment 11g is small in volume and the doors 12b and 12c are opened less frequently than the refrigerating compartment 11e, the water content of the F return air returned from the freezing compartment 11g is relatively large. Few. Therefore, the freezer compartment evaporator 22 is unlikely to be frosted. Therefore, in the evaporator 22 for the freezer compartment, the pitch Pf between the fins 25b is Pr.
It is set to the same level as 3 and the fins 25b are densely arranged. Although "Pf = Pr3" is set here, "Pf <Pr3" may be set depending on the number of times of opening / closing of the door, food difference, and the like.

As shown in FIG. 10, an F temperature sensor 33a is provided in the freezer compartment 11g.
a is connected to the control device 34. This controller 34
Is mainly composed of a microcomputer, and a compressor 17 and a cooling fan motor 29b are connected to the controller 34. Then, the control device 34
Controls the compressor 17 and the cooling fan motor 29b based on the detection signal of the F temperature sensor 33a, adjusts the amount of cold air supplied to the freezing compartment 11g, and maintains the inside of the freezing compartment 11g at a predetermined temperature.

Inside the cold air duct 27, as shown in FIG. 7, a damper device 35 is provided. This damper device 35 has an R damper 35a and a T damper 35b, and as shown in FIG. 10, is connected to a damper drive mechanism 36 including a damper motor (not shown), and the damper drive mechanism 36 is connected to the control device 34. It is connected to the. And
An R temperature sensor 33b is provided in the refrigerating room 11e,
The temperature sensor 33b is connected to the control device 34, and the control device 34 controls the R damper 35a based on the detection signal of the R temperature sensor 33b to adjust the inlet opening ratio of the R cool air duct 30a. . Thereby, the amount of cold air supplied to the refrigerating compartment 11e is adjusted, and the refrigerating compartment 11e is adjusted.
The inside is maintained at a predetermined temperature.

A T temperature sensor 33c is provided in the chilled chamber 11f.
Is provided, and the T temperature sensor 33c is connected to the control device 34. Then, the control device 34 controls the T temperature sensor 3
As the T damper 35b is driven and controlled based on the detection signal of 3c, the inlet opening ratio of the T cold air duct 30c is adjusted. As a result, the amount of cold air supplied to the chilled chamber 11f is adjusted, and the inside of the chilled chamber 11f is maintained at a predetermined temperature.

Below the evaporator 21 for the refrigerator compartment and the evaporator 22 for the freezer compartment, as shown in FIG.
An R glass tube heater 37 corresponding to the above heat source and an F glass tube heater 38 corresponding to the second heat source are provided.
These glass tube heaters 37 and 38 are for melting the frost attached to the refrigerator compartment evaporator 21 and the frost attached to the freezer compartment evaporator 22, and FIG.
As shown in, it is connected to the control device 34 corresponding to the heat generation control means.

In the cooler chamber 14, as shown in FIG. 10, an R evaporator temperature sensor 39a for detecting the temperature of the refrigerator compartment evaporator 21 is provided. This R
The evaporator temperature sensor 39a is arranged at the upper part of the refrigerator compartment evaporator 21 in which frost is likely to remain until the end during defrosting, and is connected to the control device 34.

FIG. 11A shows the operation timing of the compressor 17, and FIG. 11B shows the operation timing of the R glass tube heater 37. Here, the controller 34
Each time the compressor 17 is turned off (every one cycle of the compressor 17), the R glass tube heater 37 is energized to cause the R glass tube heater 37 to generate heat. When the detection signal of the R evaporator temperature sensor 39a reaches a predetermined temperature, the R glass tube heater 37 is turned off.

In the cooler chamber 14, as shown in FIG. 10, an F evaporator temperature sensor 39b for detecting the temperature of the freezer compartment evaporator 22 is provided. This F
The evaporator temperature sensor 39b is arranged above the freezer compartment evaporator 22 where frost is likely to remain until the end during defrosting, and is connected to the control device 34. Then, the control device 34 integrates the operating time of the refrigeration cycle 16, and when the predetermined time is reached, the F glass tube heater 38 is energized and the F glass tube heater 38 is integrated, as shown in (c) of FIG. 11.
When the detection signal of the F temperature sensor 39b reaches a predetermined temperature, the F glass tube heater 38 is turned off.

As shown in FIG. 4, the refrigeration cycle 16 is provided with a bypass passage 16a in parallel with the refrigerator compartment evaporator 21, and an electromagnetic valve 16b is inserted in the bypass passage 16a. And the electromagnetic valve 16
b is connected to the control device 34 (see FIG. 10), and the control device 34 releases the electromagnetic valve 16b when the refrigerator compartment evaporator 21 is being defrosted (when the R glass tube heater 37 is energized). . Therefore, the evaporator 21 for the refrigerator compartment
Even if the compressor 17 is operated during defrosting, the refrigerant is not supplied to the refrigerator compartment evaporator 21, but is supplied only to the freezer compartment evaporator 22.

When the evaporator 21 for the refrigerating compartment is not defrosted (when the R glass tube heater 37 is turned off), the control device 34 closes the electromagnetic valve 16b to cool the evaporator 21 for the refrigerating compartment and the freezer compartment. Refrigerant is supplied to both evaporators 22.

Inside the cooler chamber 14, as shown in FIG.
A quadrangular pyramid-shaped drain pan 40 is provided directly below the refrigerator compartment evaporator 21 and the freezer compartment evaporator 22, and defrosting water dropped from the refrigerator compartment evaporator 21 and the freezer compartment evaporator 22 is drain pan 40.
Is collected by. A drain hose 41 is embedded in the back heat insulating wall 11j of the refrigerator body 11 as shown in FIG. The drain hose 41 is connected to the drain pipe 40a of the drain pan 40 as shown in FIG. 9, and the defrost water collected by the drain pan 40 flows into the drain hose 41 through the drain pipe 40a. .

As shown in FIG. 5, an evaporation dish storage chamber 42 is provided at the bottom of the refrigerator body 11, and the evaporation dish storage chamber 42 is provided.
An evaporation dish 43 made of synthetic resin is housed inside. The lower end of the drainage hose 41 extends through the back heat insulating wall 11j of the refrigerator main body 11 and faces the inside of the evaporation tray 43.
The defrost water that has flowed into the drain hose 41 is supplied into the evaporation tray 43. The drain hose 41, as shown in FIG.
It is arranged on the back side of the cooling fan device 29.

In the machine room 15, as shown in FIG.
A fan device 44 is housed. This C fan device 4
Reference numeral 4 denotes an axial flow fan 44a, a C fan motor 44b, and a casing 44c. When the C fan device 44 operates, the machine chamber 15
The outside air is sucked into the inside, and the outside air is supplied to the condenser 18 and the compressor 17 in this order. The C fan motor 44b is connected to the control device 34 (see FIG. 10) and is controlled by the control device 34. Further, reference numeral 45 indicates the refrigeration cycle unit 13 and the refrigeration cycle 1
Reference numeral 45 a denotes a cover member that covers the front side of the cooling unit 45.

C is provided on the back heat insulating wall 11j of the refrigerator main body 11.
The fan air duct 46 is buried. The C fan air duct 46 is made of a non-water-absorbing material such as synthetic resin, and as shown in FIG.
Opens at the back left corner of the machine room 15, and as shown in FIG.
The warm air outlet 46b opens at the upper left corner of the back of the evaporation dish storage chamber 42. Then, the warm air generated by the C fan device 44 is supplied to the left corner of the back portion of the evaporation dish storage chamber 42 through the C fan blower duct 46.

The front opening of the evaporation tray accommodating chamber 42 is shown in FIG.
As shown in, the cover member 47 is detachably attached. A blowout port is formed in the cover member 47, and the warm air supplied to the left corner of the back of the evaporation dish storage chamber 42 flows forward on the water surface of the evaporation dish 43 as shown by an arrow D, and blows. It is discharged from the outlet to the outside.

Next, the operation of the above configuration will be described. When the temperature in the freezer compartment 11g rises, the controller 34 causes the F
The temperature rise is detected based on the detection signal of the temperature sensor 33a, and the compressor 17 and the cooling fan motor 29b are operated. Then, the refrigerant enclosed in the refrigeration cycle 16 is compressed to a high temperature and high pressure state and supplied to the condenser 18. Then, the condenser 18 condenses the refrigerant, the dryer 19 adsorbs the water content of the refrigerant, and the capillary tube 20 sequentially performs the pressure drop and flow rate adjustment of the liquid refrigerant, and the pressure drop and flow rate adjusted refrigerant is used for the refrigerator refrigerating chamber evaporator. 21.

When the refrigerant is supplied to the refrigerator compartment evaporator 21, the refrigerant is supplied to the arrow B by the cooling fan device 29.
Heat is taken from the air flowing in the direction to generate cold air. Next, the refrigerant that has passed through the refrigerator compartment evaporator 21 is supplied to the gas-liquid separator 23, and is separated into the gas-liquid separator 23. Then, the separated gaseous refrigerant is returned to the compressor 17 (gas injection). Further, the liquid refrigerant separated by the gas-liquid separator 23 is supplied to the freezer compartment evaporator 22, and the cooling fan device 2
9 draws heat from the air flowing in the direction of arrow A,
Generates cold air.

When the cool air is generated by the refrigerator compartment evaporator 21 and the freezer compartment evaporator 22, first, the cool air is blown from the cooler compartment 14 through the cool air outflow duct 28 into the cool air duct 27. Next, the R cool air duct 30
a, F cold air duct 30b, T cold air duct 30c, R / V
Refrigerating room 11e, chilled room 11 through cold air duct 30d
cold air is supplied to f, the freezing compartment 11g, and the vegetable compartment 11h, and F
Cold air return duct 31 and V cold air return duct 3
Cold air is returned to the cooler chamber 14 through 2. In this state, the controller 34 controls the R temperature sensor 33b and the T temperature sensor 33b.
The R damper 35a based on the detection signal of the temperature sensor 33c
Further, the T damper 35b is drive-controlled to keep the inside of the refrigerating chamber 11e and the inside of the chilled chamber 11f at a predetermined temperature.

The F return air (having a small water content) returned to the inside of the cooler chamber 14 through the F cold air return duct 31 is heat-exchanged with the evaporator 22 for the freezing chamber.
Further, the cooler chamber 14 is passed through the V cool air return duct 32.
R return air returned to the inside (with a high water content)
Is heat-exchanged with the refrigerator compartment evaporator 21. Therefore,
Frost is concentrated on the refrigerator compartment evaporator 21, and frost is less likely to adhere to the freezer compartment evaporator 22.

When the temperature in the freezer compartment 11g decreases while repeating the above operation, the controller 34 causes the F temperature sensor 3
The temperature decrease is detected based on the detection signals of 3a and the R temperature sensor 33b, the compressor 17 and the cooling fan motor 29b are stopped, and the R glass tube heater 37 is caused to generate heat. Then, the frost attached to the refrigerator compartment evaporator 21 is melted, and the refrigerator pan evaporator 21 is drained from the refrigerator pan evaporator 21.
Defrosting water flows down to 0, and evaporating dish 4 passes through drain hose 41.
It is stored in 3.

When the C fan device 44 operates in this state, first, the outside air is sucked into the machine room 15, and the outside air is heated by the condenser 18 and the compressor 17 to generate hot air. Next, this warm air is supplied to the evaporation dish storage chamber 42 through the C fan blowing duct 46, flows forward on the water surface of the evaporation dish 43, and is discharged to the outside from the air outlet of the cover member 47.

Then, the defrosted water in the evaporation tray 43 is evaporated by the hot air flowing on the water surface of the evaporation tray 43, and is discharged from the outlet together with the warm air. After this, the refrigerator 2 evaporator 2
When the frost adhering to 1 is sufficiently removed and the temperature of the refrigerator compartment evaporator 21 rises, the control device 34 increases the temperature of the refrigerator compartment evaporator 21 based on the detection signal of the refrigerator compartment evaporator temperature sensor 39a. It is detected and the R glass tube heater 37 is cut off.

In addition, the control device 34 controls the refrigeration cycle 16
When the predetermined time is reached, the F glass tube heater 38 is energized to heat the F glass tube heater 38. Then, the frost adhering to the evaporator 22 for the freezer is melted, supplied from the drain pan 40 through the drain hose 41 to the evaporation tray 43, and evaporated by the warm air supplied through the C fan blow duct 46. Each operation of the control device 34 described above is performed based on the software configuration of the control device 34.

According to the above-mentioned embodiment, the cold air (cold air having a small water content) in the freezing chamber 11g is heat-exchanged with the evaporator 22 for the freezing chamber having the dense fin pitch Pf, so that the cooling air can be efficiently and large in a small external dimension. Cooling performance is obtained, and cold air in the refrigerating compartment 11e (cold air with a large amount of water content) is heat-exchanged with the refrigerating compartment evaporator 21 having a wide fin pitch Pr, so that the refrigerating compartment evaporator 21 is frosted. . For this reason, the cooling efficiency of the evaporator 26 is improved, and the evaporator 26 is thinned, so that the refrigeration cycle unit 13 and the cooling unit 4 are cooled.
5 is also made thinner, and as a result, the space efficiency of the refrigerator is improved.

At the same time, it is possible to employ an offset fin (a fin that is retrofitted to the pipes 24a and 24b) that could not exert its effect due to the frost phenomenon in the evaporator 22 for the freezer compartment with a small amount of frost. So
Further improvement of cooling capacity and refrigeration cycle unit 1
3. Further thinning of the cooling unit 45 is realized.

In addition, the cold air in the refrigerating compartment 11e is controlled by an independent V
Heat is exchanged with the refrigerator compartment evaporator 21 through the cool air return duct 32 so that the cool air in the freezer compartment 11g can be separated by an independent F
The cold air return duct 31 is used to exchange heat with the freezer evaporator 22. Therefore, the R return air having a large water content and the F return air having a small water content can be clearly distinguished and supplied to the evaporator 26, so that the cooling efficiency of the cool air by the evaporator 26 is further improved.

Further, the cold air that has passed through the refrigerator compartment evaporator 21 and the cold air that has passed through the freezer compartment evaporator 22 are caused to flow out from the inside of the cool air blower port 28a, and the cool air blower port 28a.
It is configured to supply to the refrigerating room 11e and the freezing room 11f through. Therefore, the space occupied by the cool air blowing port 28a is reduced as compared with the case where a separate cool air blowing port is provided for the cool air that has passed through the evaporators 21 and 22. Moreover, cold air having a relatively high temperature that has passed through the refrigerator compartment evaporator 21 and low temperature cold air that has passed through the freezer compartment evaporator 22 can be mixed to generate cool air.

Further, the evaporator 21 for the refrigerating room, which is less affected by the temperature associated with the defrosting operation, is defrosted every cycle of the compressor 17. Therefore, the frosting deterioration of the refrigerating compartment evaporator 21 is reliably prevented, so that the fin pitches Pr1 to Pr3 of the refrigerating compartment evaporator 21 can be further reduced, and as a result, the refrigerating compartment evaporator 21 can be significantly reduced. It is made smaller (thinner).

Further, the refrigeration cycle 16 has a bypass 16
a is provided and the electromagnetic valve 16b is opened during defrosting of the refrigerator compartment evaporator 21. Therefore, even if the compressor 17 is operated during defrosting of the refrigerator compartment evaporator 21, the refrigerant is not supplied to the refrigerator compartment evaporator 21, but the refrigerant is supplied only to the freezer compartment evaporator 22. Therefore, even with the configuration in which the refrigerator compartment evaporator 21 is defrosted each time, it is possible to reliably generate the required amount of cold air.

Further, the evaporator 2 for the freezer compartment which is resistant to frost formation
No. 2 was defrosted after a predetermined time. For this reason, the evaporator 22 for the freezer compartment is prevented from being inadvertently heated, and the cooling performance is improved.

In addition, the refrigeration cycle 16 is connected to the refrigerator main body 11
It is configured to be placed on the upper part of. Therefore, the present invention is applied to the comp top refrigerator. For this reason,
Refrigeration cycle unit 1 like a Comptop refrigerator
3. Even if the cooling unit 45 is conspicuous, the refrigeration cycle unit 13 and the cooling unit 45 are thinned,
Since the height dimension of the refrigeration cycle 16 occupying the product height restricted by the installation space and physical distribution problems is reduced, the internal volume of the interior 11d is increased. Therefore, the thinning of the evaporator 26 described above becomes extremely advantageous in developing the product.

The refrigerator compartment evaporator 21 and the freezer compartment evaporator 22 are arranged side by side in the horizontal direction. Therefore, the evaporator 26 and the cooling unit 45 are made thinner than in the case where the refrigerator compartment evaporator 21 and the freezer compartment evaporator 22 are arranged vertically.

Further, the U-bend portion 24a 'of the refrigerator compartment evaporator 21 and the U-bend portion 24b' of the freezer compartment evaporator 22 are arranged so as to be displaced from each other. For this reason, the width dimensions (left-right direction) of the refrigerator compartment evaporator 21 and the freezer compartment evaporator 22 are reduced, and the space efficiency of the refrigerator is improved.

The refrigerant that has passed through the refrigerator compartment evaporator 21 is supplied to the gas-liquid separator 23, and the separated gaseous refrigerant is returned to the compressor 17. For this reason,
Gas injection becomes possible, and the refrigeration cycle 1
The cooling capacity of 6 is improved.

Next, a second embodiment of the present invention will be described with reference to FIG. The same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted, and only different members will be described below. A partition wall 14b is provided in the cooler chamber 14 between the refrigerator compartment evaporator 21 and the freezer compartment evaporator 22, and the cool air returned from the opening 32b of the V cool air return duct 32 is As shown by the arrow E, after being supplied to the freezer compartment evaporator 22 via the refrigerator compartment evaporator 21, it flows into the cool air blowing port 28a.

The F cool air return duct 31 joins the middle part of the V cool air return duct 32, and the cool air in the freezing chamber 11g passes from the F cool air return duct 31 through the V cool air return duct 32 to the cooler chamber 14. Will be put back inside. Further, the cold air blowing port 28a of the cold air outflow duct 28 is provided on the downstream side of the freezer compartment evaporator 22.

According to the above embodiment, the cold air in the vegetable compartment 11h, the cold air in the freezing compartment 11g, and the cold air in the refrigerating compartment 11e are:
It is returned into the cooler chamber 14 through the opening 32b of the V cold air return duct 32. Then, heat is exchanged with the refrigerator compartment evaporator 21 having a wide fin pitch Pr, and after frost is formed on the refrigerator compartment evaporator 21, heat is exchanged with the freezer compartment evaporator 22 having a fine fin pitch Pf, so that the refrigerator compartment is efficiently cooled. Therefore, since the cooling efficiency of the cool air by the evaporator 26 is improved, the evaporator 26 is thinned, and as a result, the space efficiency of the refrigerator is improved.

In the first and second embodiments, the refrigerator compartment evaporator 21 and the freezer compartment evaporator 22 are arranged in the left-right direction, but the invention is not limited to this, and for example, they are arranged in the front-rear direction. Alternatively, they may be arranged vertically.

In the first and second embodiments, the cooling fan device 29 is arranged in the cool air duct 27, but the invention is not limited to this. For example, the cooler chamber 1
You may arrange | position in the back part in 4.

In the first and second embodiments, the evaporating dish 43 is provided at the bottom of the refrigerator main body 11 and the warm air is supplied to the evaporating dish 43 through the C fan blow duct 46. The invention is not limited to this. For example, the evaporation tray 43 may be housed in the machine room 14, a heat radiation pipe is connected to the refrigeration cycle 16, and the heat of the heat radiation pipe may heat the evaporation tray 43.

[0072]

As is apparent from the above description, the refrigerator of the present invention has the following effects. According to the means of claim 1, the cold air in the freezer compartment is heat-exchanged with the second cooler having a fine fin pitch, and the cold air in the refrigerating compartment is heat-exchanged with the first cooler having a wide fin pitch. did. For this reason,
Since the cooling efficiency of the cool air by the cooler is improved, the cooler is downsized, and as a result, the space efficiency of the refrigerator is improved.

According to the second aspect of the invention, the cold air in the refrigerating chamber and the cold air in the freezing chamber are exchanged with the cooler through independent cold air return ducts. Therefore, the cooling efficiency of the cool air by the cooler is further improved. According to the third aspect of the invention, the cold air that has passed through the first cooler and the cold air that has passed through the second cooler are supplied from the common cold air outlet to the refrigerating compartment and the freezing compartment. Therefore, the space occupied by the cool air discharge port is reduced, and moreover, the cool air is generated by mixing the cool air that has passed through the respective coolers.

According to the fourth aspect, after the cold air in the freezing chamber and the cold air in the refrigerating chamber are heat-exchanged with the first cooler having a wide fin pitch, the second cooler having a fine fin pitch is exchanged. The heat exchange was adopted. Therefore, the cooling efficiency of the cool air is improved, so that the cooler is downsized, and as a result,
Space efficiency of the refrigerator is improved. According to the means described in claim 5, the first cooler is defrosted for each cycle of the compressor. Therefore, the frosting deterioration of the first cooler is prevented, and as a result, the cooling performance is improved.

According to the sixth aspect of the invention, the second cooler is defrosted at intervals. Therefore, the second
Since the cooler of No. 1 is prevented from being inadvertently heated, the cooling efficiency is further improved. According to the means of claim 7,
The first cooler and the second cooler are arranged horizontally. Therefore, the cooler is made thin.

According to the means described in claim 8, the refrigeration cycle is arranged above the refrigerator body. Therefore, since the present invention is applied to the Comptop refrigerator,
The thinning of the cooler described above is extremely advantageous in developing the product. According to the means described in claim 9, the U bend portion of the first cooler and the U bend portion of the second cooler are arranged so as to be displaced from each other. Therefore, the width dimension of the cooler is reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a refrigeration cycle unit showing a first embodiment of the present invention.

FIG. 2 is a top view showing an evaporator for a refrigerating room and an evaporator for a freezing room.

FIG. 3 is a perspective view showing a positional relationship between a refrigerator evaporator and a freezer evaporator.

FIG. 4 is a diagram showing a connection state of a refrigeration cycle.

FIG. 5 is a vertical sectional side view showing the overall configuration.

FIG. 6 is a vertical sectional front view showing the overall configuration.

FIG. 7 is a cross-sectional view showing a cold air duct.

FIG. 8 is a vertical sectional side view showing an enlarged machine room.

FIG. 9 is a vertical sectional front view showing a refrigeration cycle unit.

FIG. 10 is a block diagram schematically showing an electrical configuration.

FIG. 11 is a diagram showing operation timings of a compressor and a glass tube heater.

FIG. 12 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 13 is a view corresponding to FIG. 9 showing a conventional example.

FIG. 14 is a view equivalent to FIG.

[Explanation of symbols]

11 is a refrigerator main body, 11e is a refrigerating room, 11g is a freezing room,
14 is a cooler room, 16 is a refrigeration cycle, 17 is a compressor, 21 is a refrigerator compartment evaporator (first cooler),
22 is an evaporator (second cooler) for a freezer, 24a
′ And 24b ′ are U-bend parts, 26 is an evaporator (cooler), 28a is a cool air blowing port (cool air discharge port), 31
Is F cold air return duct (second cold air return duct), 31b is opening (second cold air flow inlet), 32 is V cold air return duct (first cold air return duct), 32
b is an opening (first cold airflow inlet), 34 is a control device (heat generation control means), 37 is an R glass tube heater (first heat source),
Reference numeral 38 indicates an F glass tube heater (second heat source).

Claims (9)

[Claims] 1. A cooler chamber for accommodating a cooler of a refrigeration cycle and for generating cold air to be supplied to a refrigerating chamber and a freezing chamber; and a cooler chamber provided in this cooler chamber for returning the cool air in the refrigerating chamber to the cooler chamber. A first cold airflow inlet; and a second cold airflow inlet provided in the cooler chamber for returning the cold air in the freezer chamber to the cooler chamber, the cooler comprising: from the first cold airflow inlet First to cool inflowing cold air
And a second cooler for cooling the cold air flowing from the second cold airflow inlet.
The refrigerator is characterized in that the fin pitch of the second cooler is set smaller than the fin pitch of the upstream portion of the cold air flow in the first cooler. 2. A first cold air return duct for supplying cold air from the refrigerating chamber to the first cold air flow inlet, and a second cold air return duct for supplying cold air from the freezing chamber to the second cold air flow inlet. Claim 1 characterized by the above.
Refrigerator described. 3. A first cooler and a second cooler are provided in the cooler chamber.
2. The refrigerator according to claim 1, further comprising a cold air discharge port for supplying cold air that has passed through the cooler to the refrigerating room and the freezing room. 4. A cooler chamber for accommodating a cooler and generating cold air to be supplied to the refrigerating chamber and the freezing chamber; and a cooler chamber provided in the cooler chamber for cooling the cool air in the refrigerating chamber and the freezing chamber A cooling airflow inlet for returning the cooling airflow, wherein the cooling device includes a first cooling device located upstream of a cold air flow flowing in from the cooling airflow inlet and a second cooling device located downstream of the first cooling device. A refrigerator, wherein the fin pitch of the second cooler is set smaller than the fin pitch of the upstream portion of the cold air flow in the first cooler. 5. A first heat source for removing frost attached to a first cooler, a second heat source for removing frost attached to a second cooler, the first heat source and the second heat source. 5. The refrigerator according to claim 1, further comprising a heat generation control unit configured to control heat generation of the heat source, wherein the heat generation control unit is configured to heat the first heat source for each cycle of the compressor. 6. The refrigerator according to claim 5, wherein the heat generation control means is configured to heat the second heat source for a predetermined time. 7. The refrigerator according to claim 1, wherein the first cooler and the second cooler are arranged in a horizontal direction. 8. The refrigerator according to claim 7, wherein the refrigeration cycle is arranged on the upper part of the refrigerator body. 9. The refrigerator according to claim 7, wherein the U bend portion of the first cooler and the U bend portion of the second cooler are misaligned.