JP2001099542A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling performance of a refrigerator with a freezer and a cold room. SOLUTION: The refrigerator is composed of at least a freezer and a cold room, and is equipped with a reciprocating compressor 69, a condenser 71, a motorized three-way valve 72, first and second capillary tubes 73 and 74, a cooler 36 for the freezer, a cooler 26 for the cold room, and a controlling device. The controlling device changes the three-way valve based on the temperature of the freezer and the cold room, condenses a refrigerant being discharged from the compressor by the condenser, executes one of a both-room cooling mode for successively supplying to the coolers for the cold room and freezer from one outlet of the three-way valve via the capillary tube 73 and a freezer cooling mode for supplying to the cooler for the freezer from the other of the three-way valve via the capillary tube 74, and closes both the outlets of the three-way valve when the compressor is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator comprising at least a freezer compartment and a refrigerator compartment.

[0002]

2. Description of the Related Art Conventionally, this kind of refrigerator has a freezing room, a refrigerator room, a vegetable room and the like in addition to a refrigerator room and a refrigerator room in an insulated box as shown in Japanese Utility Model Publication No. 6-12301 (F25D23 / 00). A method of installing a cooler and a blower in a cooling room defined at the back of the freezing room, supplying cool air cooled by the cooler to each of the above-mentioned rooms by a blower, and circulating and cooling. I was

In this case, by supplying cool air through a damper to the refrigerator compartment, the temperature in the refrigerator compartment is brought to a predetermined refrigeration temperature, and the vegetable compartment flows the cool air circulated in the refrigerator compartment around the container. In this way, a method of indirectly cooling the vegetables in the container has been adopted.

[0004]

As described above, since the freezing room, the refrigerator room, and the vegetable room are conventionally all cooled by one cooler, the cooling performance of each room is inevitably reduced.
And it becomes unstable and wins. In particular, since the cool air after cooling the refrigerator compartment into the vegetable compartment flows into the compartment, the cooling tends to be insufficient. In addition, there is also a problem that frost formation increases because cold air circulated in a relatively high-temperature refrigerator compartment or vegetable room and cold air circulated in a low-temperature freezer compartment flow into the cooler.

On the other hand, in the refrigerant circuit of this type of refrigerator, when the compressor is stopped, the refrigerant on the high pressure side naturally flows into the low pressure side, causing the refrigerant to move, so that the temperature of the cooler rises and the cooling efficiency decreases. There was also a problem. Therefore, in a refrigerator using a conventional rotary compressor, a type in which the high-pressure side and the low-pressure side of the refrigerant circuit are shut off using a so-called differential pressure valve that operates by increasing the pressure on the low-pressure side when the compressor stops has been considered. However, when a reciprocating compressor is used as a compressor, there is a problem that it is difficult to take such a pressure difference between during operation and during stop, and it cannot be adopted.

The present invention has been made to solve such a conventional technical problem, and has as its object to improve the cooling performance of a refrigerator having a freezing room or a refrigerator room.

[0007]

The refrigerator according to the present invention comprises at least a freezer compartment and a refrigerator compartment, and comprises a reciprocating compressor, a condenser, an electric three-way valve,
And a second decompression device, a freezer compartment cooler, a refrigerator compartment cooler, and a control device, the control device switches the three-way valve based on the temperature of the freezer compartment and the refrigerator compartment, After condensing the refrigerant discharged from the compressor in the condenser, a two-chamber cooling mode in which the refrigerant is sequentially supplied from one outlet of the three-way valve to the refrigerator cooler and the refrigerator cooler through the first pressure reducing device. In the alternative, the freezer compartment cooling mode for supplying the freezer compartment cooler from the other outlet of the three-way valve through the second pressure reducing device is executed, and when the compressor is stopped, both the three-way valve are operated. The outlet is closed.

A refrigerator according to a second aspect of the present invention is characterized in that the three-way valve is driven by a motor.

According to the present invention, in a refrigerator having at least a freezer compartment and a refrigerator compartment, a reciprocating compressor, a condenser, an electric three-way valve, first and second pressure reducing devices, Freezer compartment cooler, refrigerator compartment cooler, and a control device, the control device, by switching the three-way valve based on the temperature of the freezer compartment and the refrigerator compartment, discharged from the compressor After condensing the refrigerant in the condenser, a two-chamber cooling mode in which the one-way outlet of the three-way valve sequentially supplies the cooler for the refrigerator and the cooler for the freezer through the first decompression device and the other of the three-way valve Since the freezing room cooling mode in which the refrigerator is supplied to the freezing room cooler from the outlet through the second decompression device is selectively executed, the freezing room is provided by the freezing room cooler, and the refrigerating room is provided by the cold room cooling device. It will be cooled independently.

[0010] Thereby, the cooling performance of each room is improved, and frost formation on the cooler for the freezing room is reduced as compared with the related art. In addition, the refrigerant is supplied to each cooler by one compressor, and particularly, when the compressor is stopped, the control device closes both outlets of the three-way valve. In addition, the movement of the refrigerant on the low pressure side is also prevented, and as a result, the cooling operation efficiency is significantly improved as a whole, thereby contributing to energy saving.

Particularly, since an electric three-way valve such as a motor drive is used, the high-pressure side and the low-pressure side are reliably shut off when the compressor is stopped, despite the use of a reciprocating compressor. Is what you can do.

[0012]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view of a refrigerator 1 to which the present invention is applied, FIG. 2 is a longitudinal side view of the refrigerator 1, FIG. 3 is an exploded perspective view of a back plate 49 and a back heat insulating material 50 of the refrigerator compartment 11 of the refrigerator 1, and FIG. FIG. 5 is a sectional plan view of the refrigerator compartment 11 of the refrigerator 1.
Is a cross-sectional plan view of the partition wall 7 of the refrigerator 1, and FIG.
FIG. 7 is a block diagram of a control device C of the refrigerator 1.

The refrigerator 1 has a front-opening heat-insulating box 6 formed by filling a heat-insulating material 4 such as foamed polyurethane between an outer box 2 made of a steel plate and an inner box 3 made of a hard resin such as ABS by a foaming method in place. It is composed of The interior of the heat-insulating box 6 is vertically divided by a partition wall 7 formed of a heat-insulating wall integrally formed with the heat-insulating box 6, and the inside of the heat-insulating box 6 above the partition 7 is upper-partitioned. It is vertically divided by a member 8.

A refrigerator compartment 11 is provided above the upper partition member 8, and a vegetable compartment 12 is provided between the upper partition member 8 and the partition wall 7. Further, the opening edge of the heat insulating box 6 below the partition wall 7 is vertically divided by a lower partition member 9, and the lower side of the lower partition member 9 is a freezing compartment 13. The space between the partition wall 7 and the lower partition member 9 is further divided into left and right by a heat insulating wall 30 (FIG. 5).
(FIG. 5). In FIG. 5, the partition wall 7 is shown for explanation.
Hatching is omitted.

The front opening of the refrigerating compartment 11 is closed by a rotatable heat-insulating door 14 so as to be openable and closable, and the freezing compartment 13 and the vegetable compartment 12 have containers 16A, 17A having top openings.
Are respectively opened and closed by drawer-type heat-insulating doors 16 and 17 each having a. The ice making chamber 10 is also openably closed by a drawer-type heat-insulating door 18 provided with a container 18A having an upper surface opening, and the select chamber 15 is also openably closed by a similar drawer-type heat-insulating door 19 (FIG. 1). Have been. Reference numeral 20 denotes a control panel provided at the lower part of the front of the door 14.

In the upper part of the ice making room 10, an automatic ice making machine 2 is provided.
1 is installed. Further, the back of the vegetable compartment 12 is partitioned forward and backward by a partition plate 22 and a cooler front plate 23, and a cooling chamber 24 is defined behind the cooler front plate 23, and refrigerated in the cooling chamber 24. A room cooler 26 is provided vertically.
Above the refrigerator cooler 26, a refrigerator blower 27 is provided.
Is provided, and a defrost heater 28 is provided below the refrigerator cooler 26. Also, this defrost heater 2
A drain receiver 29 is formed below 8.

The back of the freezer compartment 13 from the back of the ice making compartment 10 and the select compartment 15 is partitioned forward and backward by a partition plate 32 and a cooler front plate 33, and a cooling compartment 34 is provided behind the cooler front plate 33. Is formed, and a freezer compartment cooler 36 is vertically provided in the cooling chamber 34. Above the freezer compartment cooler 36, a freezer compartment blower 37 is provided, and below the freezer compartment cooler 36, a defrost heater 38 is provided. A drain receiver 39 is formed below the defrost heater 38.

An ice making chamber discharge port, a select chamber discharge port and the like are formed in the upper part of the partition plate 32, a freezer compartment discharge port 13A is formed in the center part, and a freezer compartment is formed in the lower part of the partition plate 32. An inlet 13B is formed. A motor damper 76 (FIG. 7) for opening and closing the cool air flow path based on the temperature of the select chamber 15 is attached to a select chamber discharge port (not shown).

On the other hand, a vegetable compartment suction port 12A is formed below the partition plate 22 at the back of the vegetable compartment 12, and
The upper end of the space between the chiller and the cooler front plate 23 communicates with a refrigerator compartment rear duct 47 described later. Further, a vegetable compartment discharge port 12B for blowing out cool air is formed below the upper partition member 8 at an upper portion of the partition plate 22.

On the other hand, a back plate 49 and a back heat insulating material 50 are attached to the back of the refrigerator compartment 11 at a distance from the back of the inner box 3 at a distance from the back of the inner box 3. The refrigerator compartment rear duct 47 extending vertically is formed. The refrigerator compartment discharge ports 11 </ b> A are formed on the left and right sides of the rear plate 49, and penetrate the rear heat insulating material 50 and communicate with the refrigerator compartment rear duct 47. In the refrigerating room 11, a plurality of shelves 51 are provided.

The left and right heat insulating materials 5 are provided on the left and right sides of the rear plate 49, respectively.
The recesses 31, 31 are formed on both sides of the vertical axis 0 and extend vertically.
Is attached. Then, the front surfaces of the recesses 31, 31 are closed by a light-transmitting shade (not shown) (in FIG. 2, the left illumination lamp 59 is seen through).

Further, an upper partition member 8 is provided at a lower portion of the refrigerator compartment 11.
A partition plate 42 is attached at a predetermined interval above the partition plate 42. An openable and closable lid 43 is rotatably hung on the front side of the partition plate 42, and a built-in chamber is formed in a space surrounded by these. 44 are formed. This built-in chamber 44 is set to an ice temperature / temperature zone. In this built-in chamber 44, a container 48 that can be pulled out is stored. Reference numeral 44A denotes a discharge port of the built-in chamber formed in the back plate 49,
It communicates with the lower part.

The upper partition member 8 has a refrigerator compartment suction port 51.
The refrigerator compartment suction port 51 is connected to the vegetable compartment 12.
Communicates within. Further, the built-in chamber 44 houses a water supply tank (not shown) for supplying water to the automatic ice making machine 21.

The container 17A housed in the vegetable compartment 12
The upper surface of the container 1 is closed by a lid 53, and the cool air returning from the refrigerator compartment 11 passes through the refrigerator compartment suction port 51 and this container 1
After being circulated around 7A, it is returned to the cooling room 24 from the vegetable room suction port 12A. In addition, the ice making room 10 and the freezing room 13
Is returned to the cooling chamber 34 from the freezing chamber suction port 13B. The select chamber 15 is returned to the cooling chamber 34 from a not-shown select chamber suction port.

Here, a concave portion 54 is formed in the center of the front surface of the rear heat insulating material 50 so as to be vertically depressed, and a suction port 56 is formed in the rear plate 49 at a position corresponding to a lower portion of the concave portion 54. Is attached. A rear duct 57 for an air curtain is formed in the concave portion 54 closed by the rear plate 49, and the electric heater H for temperature compensation is formed therein.
Is attached. Reference numeral 55 denotes a cover attached to the suction port 56.

An air curtain blower 68 having a turbo fan 67 for sucking cool air from the axial direction (front) and blowing it out in the radial direction is disposed in the air curtain rear duct 57 located behind the suction port 56. ing. A top plate 63 is attached to the top surface of the refrigerator compartment 11, and inside the top plate 63, a top duct 64 for an air curtain is formed extending back and forth. The rear end of the top curtain 64 for the air curtain is connected to the rear duct 57 for the air curtain.
The upper surface duct 6 for air curtain
A plurality of outlets 66 are arranged at the front end of the refrigerator 4 in the vicinity of the front opening of the refrigerator compartment 11 (see FIG. 2).
Then, the blower 68 is seen through.)

On the other hand, a machine room 41 is formed at the lower part of the heat insulating box 6, and in the rear part of the machine room 41, the refrigerating cycle of FIG. A compressor 69 and the like and a machine room blower 94 (FIG. 7) constituting the refrigerant circuit of FIG. In the refrigerant circuit diagram of FIG. 6, reference numeral 71 denotes a condenser, 72 denotes a motor-driven three-way valve, and 73 and 74 denote capillary tubes as first and second decompression devices, respectively. The compressor 69 is a reciprocating compressor. The capillary tubes 73 and 74 are soldered so as to have a heat exchange relationship with a refrigerant suction pipe 69S described later.

The refrigerant discharge pipe 69D of the compressor 69
Is connected to a condenser 71, and an outlet 71A of the condenser 71 is connected to a three-way valve 72 via a dryer 70. Three-way valve 7
One of the two outlets is connected to the inlet of the refrigerator cooler 26 via the capillary tube 73, and the outlet of the refrigerator cooler 26 is connected to the inlet of the freezer cooler 36.

The other outlet of the three-way valve 72 is connected via a capillary tube 74 to the inlet of the freezer compartment cooler 36, and the outlet of the freezer compartment cooler 36 is connected to the compressor 69.
Is connected to the refrigerant suction pipe 69S. In addition, the three-way valve 7
2 is a flow chart of the liquid refrigerant from the condenser 71 to the capillary tube 73.
In addition to having a function of opening and closing the outlet so as to selectively flow through the capillary tube 74, it also has a function of closing both outlets to completely close the flow path and a function of opening both outlets. Reference numeral 40 denotes a header as a refrigerant reservoir connected between the freezer compartment cooler 36 and the compressor 69.

Here, FIGS. 8 and 9 are perspective views of the refrigerator 26 or the refrigerator 36. FIG.
Both coolers are so-called fin tube type heat exchangers,
Since the basic structure is the same even if there is a difference in dimensions and the like, the following description will be made as the refrigerator cooler 26. That is, the refrigerator cooler 26 includes a refrigerant pipe 77 bent in a meandering shape, and a plurality of aluminum heat exchange fins 78 fitted to the refrigerant pipe 77. The refrigerant pipe 77
In the example, three rows of front and rear are formed (a refrigerant pipe in the rightmost row in each drawing is 77A, a refrigerant pipe in the center is 77B, and a refrigerant pipe in the left end is 77C).
７７77C is bent three times back and forth in the horizontal direction across the top and bottom.

On the other hand, each of the fins 78 has the same shape, and a circular shape having an inner diameter substantially similar to the outer diameter of the refrigerant pipe 77 so that the refrigerant pipe 77 is inserted into and fitted to one side. Are formed at predetermined intervals in the vertical direction. Further, an oval notch 81 cut inward is formed on the other edge of the fin 78, which is also formed in the fitting hole 7.
A plurality is formed above and below at the same interval as 9.

The inner part of each notch 81 is formed in a semicircle having an inner diameter substantially similar to the outer diameter of the refrigerant pipe 77, and extends horizontally from the semicircle to the edge. The distance from the edge on the other side to the center of the circular portion at the back of the notch 81 is equal to the distance from the edge on one side to the fitting hole 79.
Is the same as the distance to the center.

With the above configuration, the refrigerant pipe 77A is connected to the fin 7
8 are inserted and fitted into the fitting hole 79 of the cooling pipe 8 so as to insert and fix the plurality of fins 78... Also, the refrigerant pipe 77C is inserted and fitted into the fitting hole 79 of the fin 78, so that a plurality of fins 78 are provided at predetermined intervals.
... is inserted and fixed in the refrigerant pipe 77C. At this time, the positions of the fins 78... Of the refrigerant pipe 77C are attached so as to be shifted from the positions of the fins 78.

Next, the notches 81... Of the fins 78... Of the refrigerant pipes 77A and 77C are opposed to each other, and the refrigerant pipe 77B is first connected to the fins 78. Insert from the edge into the notch 81... And fit to the innermost part. Next, the refrigerant pipe 77B is inserted from the edge into the notch 81 ... of each fin 78 ... of the refrigerant pipe 77C, and fitted to the innermost part.

By such fitting, via the refrigerant pipe 77B,
Since the refrigerant pipes 77A and the fins 78 and the refrigerant pipes 77C and the fins 78 are firmly integrated, the reinforcing side plates and the like conventionally used can be eliminated. Also, in the central portion 82 (the portion of the refrigerant pipe 77B) of the refrigerator 26, the fins 78 of the refrigerant pipes 77A and 77C overlap each other, so that the central portion 82 is dense and both sides are sparse. Can be realized. This makes it possible to delay the blockage due to frost in the sparse part while improving the heat exchange performance in the dense part. Furthermore, since the shapes of all the fins can be made the same, the cost for mold investment can be reduced, and a low-cost heat exchanger can be realized.

Next, in FIG. 7, the control device C is constituted by a general-purpose microcomputer M. The inputs of the control device C are a freezer compartment temperature sensor 83 for detecting the temperature of the freezer compartment 13, A refrigerator room temperature sensor 84 for detecting the temperature, a select room temperature sensor 86 for detecting the temperature of the select room 15, an outside air temperature sensor 87 for detecting the outside air temperature around the refrigerator 1, and the surrounding area where the refrigerator 1 is installed. Sensor 88 for detecting the illuminance (brightness) of the refrigerator, refrigerator temperature sensor 89 for detecting the temperature of the refrigerator cooler 26, and refrigerator temperature for detecting the temperature of the refrigerator 36. A sensor 91, a setting switch 92, an energy saving switch 93, and the like are connected. This setting switch 9
2 and the energy saving switch 93 are connected to the control panel 20.
Placed in

The compressor 69, the machine room blower 94, the freezer room blower 37 and the refrigerator room blower 27 are connected to the output of the microcomputer M via inverter circuits 98, 99, 101 and 102, respectively. The air curtain blower 68, the three-way valve (motor) 7
2, defrost heaters 38, 28, electric heater H for temperature compensation,
The motor damper 76 and the ice making machine 21 are connected. Further, an output of the microcomputer M is connected to a display 96 composed of LEDs and an electronic sound generator 97, which are also arranged on the control panel 20.

Next, the operation of the refrigerator 1 of the present invention having the above configuration will be described. First, the operation of setting the temperature of each room will be described. The microcomputer M includes temperature sensors 83 and 84
, The temperature of the freezer compartment 13 (and the temperature of the refrigerator compartment 11) is digitally displayed on the display 96. In addition, based on the pressing operation of the freezing room temperature setting switch of the setting switch 92, the setting temperature of the freezing room 13 is set in a range of, for example, −18 ° C. (upper limit value) to −28 ° C. (lower limit value), and a display is provided. At 96, a bar is displayed (displayed by the number of lighting of a plurality of LED columns).

In this case, the microcomputer M causes the electronic sound generator 97 to generate an electronic sound "pi" once each time the freezer compartment temperature setting switch is pressed. Further, by the pressing operation, the set temperature is circulated from −18 ° C. to −28 ° C. and from −28 ° C. to −18 ° C. At this time, when the temperature reaches −18 ° C., the microcomputer M
Causes the electronic sound generator 97 to generate an electronic sound twice (three times in total when pressed). When the temperature reaches −28 ° C., an electronic sound is generated once (two times in total when pressed).

This makes it possible to determine that the set temperature has reached the upper limit value or the lower limit value even when a person who is visually impaired operates. In the embodiment, the upper limit or the lower limit is notified based on the number of generations of the electronic sound. However, the scale and sound quality of the electronic sound may be changed. When the freezing room temperature setting switch is pressed and released momentarily, the microcomputer M changes the set temperature by, for example, 2 ° C., but when the switch is continuously pressed, the microcomputer M finely changes the temperature by, for example, 0.4 ° C. .

The setting switch 92 is also provided with a refrigerator temperature setting switch.
It can be set in the range of 1 ° C. (lower limit) to + 5 ° C. (upper limit). The setting switch 92 is also provided with a select room setting switch.
Can be changed to the refrigeration temperature or the freezing temperature. Then, the microcomputer M is turned on above and below the set temperature of each room by a differential of, for example, 3 ° C.
Point-Set the OFF point. At this time, the outside air temperature sensor 8
For example, when the outside air temperature is equal to or lower than + 20 ° C., the differential of the refrigerator compartment 11 is set to 2 ° C. based on the output of 7 to stabilize the temperature control.

On the other hand, when the energy saving switch 93 is pressed, the microcomputer M enters an energy saving mode,
For example, the set temperature of each chamber is uniformly increased by 1 ° C., for example.
In this case, the microcomputer M is an optical sensor 88
If it is determined that the illuminance is low at night based on the output of, the temperature rise is set to 2 ° C., for example. As a result, the power required for the cooling operation described below is reduced, so that energy can be saved and the electricity charge can be reduced.

Thus, the power consumption of the refrigerator 1 can be reduced in a situation where the load in the refrigerator is expected to be light, particularly in a situation where food is not taken in and out. During this energy saving mode, any one of the doors 14, 1
When 6, 18, and 19 are opened, the microcomputer M cancels the energy saving mode.

Basically, the microcomputer M changes the operating frequency of the compressor 69, including the stoppage, for example, to 37HZ, 48HZ, 58H by the inverter circuit 98.
Z, 64HZ, 68HZ 5 steps (outside air temperature is +27
When the temperature is below ℃, usually 37HZ, when it is above 48H
Z) can be changed.

The microcomputer M controls each phase (R) of the compressor 69 by an inverter circuit 98 (PWM control).
(Phase, S-phase, T-phase). As a result, operation vibration and noise can be reduced as compared with the case where a rectangular wave is applied, and energy can be saved.

Further, the freezer compartment blower 37 and the refrigerator compartment blower 27 are controlled by the inverter circuits 101 and 102, for example, from 700 rpm to 1500 rpm including the stop (the freezer compartment blower 37 is usually 1300 rpm, and the refrigerator compartment blower 27 is usually It can be changed within the range of 1000 rpm). Furthermore, the machine room blower 94 includes, for example, 1200 rpm (when the compressor 69 operates at 37 HZ and 48 HZ) and 1400 rpm including the stop by the inverter circuit 99.
(When the compressor 69 is operating at 58HZ, 64HZ, 68HZ)
Can be changed.

Further, the machine room blower 94 is basically operated in synchronism with the compressor 69, but is stopped based on the output of the outside air temperature sensor 87 when, for example, the outside air temperature is + 10 ° C. or less.

When the cooling operation is started and the compressor M is operated by the microcomputer M, the high-temperature and high-pressure gas refrigerant discharged from the refrigerant discharge pipe 69D of the compressor 69 flows into the condenser 71 and radiates heat. And is condensed and liquefied. Then, the refrigerant that has exited the condenser 71 enters the three-way valve 72 via the dryer 70.

When the temperatures of the freezing compartment 13 and the refrigerating compartment 11 detected by the temperature sensors 83 and 84 are both high (when the OFF point has not been reached), the microcomputer M opens the three-way valve 72 to the capillary tube 73 side. Then, the capillary tube 74 side is closed (both chamber cooling mode). As a result, the refrigerant condensed and liquefied in the condenser 71 is decompressed in the capillary tube 73, then flows into the refrigerator cooler 26 and the refrigerator cooler 36 in order, and evaporates.
The cooling capacity is exhibited at 6, 36.

When the temperature of the refrigerator 11 reaches the OFF point based on the output of the temperature sensor 84 from this state, the microcomputer M switches the three-way valve 72 to the capillary tube 74.
Side, and the capillary tube 73 side is closed (freezer compartment cooling mode). As a result, the refrigerant condensed and liquefied in the condenser 71 is decompressed in the capillary tube 74, and then flows into the freezer compartment cooler 36 to evaporate therefrom.
6 demonstrates the cooling capacity. When the temperature of the freezing room 13 reaches the OFF point, the microcomputer M stops the compressor 69, closes both outlets of the three-way valve 72, and completely closes the flow path.

By closing the three-way valve 72, the inside of the refrigerant circuit is completely isolated between the high-pressure side and the low-pressure side, so that the inconvenience that the high-temperature refrigerant naturally flows from the high-pressure side to the low-pressure side is prevented. As a result, unnecessary rises in temperature and pressure in the coolers 26 and 36 are avoided, operation efficiency is improved, and energy is saved.

Further, since the compressor 69 is constituted by a reciprocating compressor, it is more difficult to obtain a pressure difference (differential pressure) on the low pressure side during the operation and during the stop of the compressor than the rotary compressor. However, since the flow path is closed by the motor-driven three-way valve 72, the high-low pressure difference in the refrigerant circuit can be reliably maintained. When the temperature of the freezing compartment 13 rises to the ON point, the microcomputer M operates the compressor 69 again to open the three-way valve 72 to the capillary tube 74 side. The microcomputer M controls the operation / stop of the compressor 69 based on the temperature of the freezing room 13, opens the three-way valve 72 toward the capillary tube 74, and controls the three-way valve 72 toward the capillary tube 73 depending on the temperature of the refrigerator 11. I do.

When the temperature of the refrigerator compartment 11 rises to the ON point while the refrigerant is flowing through the capillary tube 74, the microcomputer M opens the three-way valve 72 again to the capillary tube 73 side, and The tube 74 side is closed. If the temperature of the freezing compartment 13 detected by the temperature sensor 83 is, for example, -5 ° C. or higher, the operating frequency of the compressor 69 is increased by one step until the OFF point is reached.

The temperatures of the chambers 11 and 13 are turned on from the OFF point.
While ascending to the point, each of the blowers 27 and 37 is basically stopped and operated from the ON point to the OFF point. In each case, operation control is performed independently. When the freezing room blower 37 is operated, the cool air in the cooling room 34 cooled by the freezing room cooler 36 is discharged from the ice making room discharge port and the select room discharge port to the ice making room 10 and the select room 15. At the same time, the liquid is discharged from the freezing compartment discharge port 13A to the freezing compartment 13. Then, after circulating and cooling in each room, the cool air returns to the inside of the cooling room 34 from the freezing room suction port 13B (FIG. 2).
Solid arrow). Thereby, the inside of the freezing room 13 is maintained at the set temperature.

The temperature in the ice making chamber 10 is also set to the freezing temperature, and ice is made by the automatic ice making machine 21. Further, the microcomputer M controls the motor damper 76 based on the output of the temperature sensor 86 to control the amount of cool air supplied from the outlet of the select chamber, and makes the select chamber 15 a selected refrigerator or freezer.

On the other hand, when the refrigerator air blower 27 is operated, the cold air in the cooling room 24 cooled by the refrigerator air cooler 26 flows into the refrigerator room rear duct 47, and the cold room discharge port 1 is cooled.
1A, etc., are blown out into the refrigerator compartment 11 and the built-in chamber 44 from the built-in chamber discharge port 44A, circulate through the inside and cool, and then flow into the refrigerator compartment suction port 51.

The cool air flowing into the refrigerator compartment suction port 51 passes through the upper partition member 8 and cool air blown out from the vegetable compartment discharge port 12B (part of the cool air immediately after heat exchange with the refrigerator compartment cooler 26). After mixing and entering the vegetable room 12, circulating around the container 17A and indirectly cooling the inside of the container 17A, it is sucked through the vegetable room suction port 12A and returned to the cooling room 24. Thereby, the inside of the refrigerator compartment 11 is maintained at the set temperature, and the vegetables in the container 17A are kept cool while drying is prevented (solid arrows in FIG. 2).

The freezing room 1 where the freezing temperature is required as described above
3, the ice making room 10, and the selection room 15 are provided with a refrigerator 36
The refrigerator compartment 11 and the vegetable compartment 1 which are cooled at a relatively high temperature
2 is cooled by the refrigerator cooler 26, respectively.
The cooling operation efficiency is remarkably improved as compared with the conventional case where each chamber is cooled by one cooler.

In the refrigerator compartment 11 and the vegetable compartment 12, the cool air flowing through the refrigerator compartment 11 and the built-in compartment 44 flows into the vegetable compartment 12, and the cool air directly from the refrigerator compartment blower 27 is mixed therein. Therefore, insufficient cooling of the vegetable compartment 12 is also eliminated.

The microcomputer M is a three-way valve 72.
Is switched from the state of opening to the capillary tube 74 side to the state of opening to the capillary tube 73 side, the operation of the refrigerating room blower 27 is delayed by, for example, 3 minutes. Here, the three-way valve 72 is connected to the capillary tube 7.
In the state opened to the side 4, since the refrigerant does not flow through the refrigerator cooler 26, the excess refrigerant
Stored at 0. Further, the temperature of the refrigerator cooler 26 is relatively high, and the internal pressure is also high.

Therefore, when the three-way valve 72 is opened to the capillary tube 73 side, the pressure in the refrigerator cooler 26 moves to the refrigerator cooler 36, and the liquid refrigerant in the header 40 moves toward the compressor 69. However, if the start of operation of the refrigerator air blower 27 is delayed as described above, a decrease in the temperature of the refrigerator air cooler 26 can be promoted. Occurrence can be prevented or suppressed.

Further, when the temperature in the refrigerator compartment 11 becomes higher than the ON point by, for example, 6 ° C., or when the three-way valve 72 is open to the capillary tube 73 side, for example, 60 ° C.
When the number of minutes has elapsed (when the refrigerator compartment 11 is under a high load), the microcomputer M increases the rotation speed of the refrigerator compartment blower 27 to 1300.
rpm. Further, when the compressor 69 is operated continuously for, for example, 60 minutes, the operating frequency of the compressor 69 is increased by one step until the refrigerator compartment 11 reaches the OFF point.

Further, when one of the doors 14 and 17 is opened, the microcomputer M operates the refrigerator air blower 2.
7 is stopped, and when any of the doors 16, 18, 19 is opened, the freezer-room blower 37 is stopped. This suppresses cold air leakage from each room.

The microcomputer M is connected to the refrigerator compartment 1
When the first door 14 is closed and the temperature in the refrigerator compartment 11 is lower than a predetermined high temperature, for example, + 6 ° C., the air curtain blower 68 is stopped. When the door 14 is opened, the microcomputer M operates the air curtain blower 68 (the lighting lamp 5).
9 is also lit).

When the air curtain blower 68 is operated, the cool air in the refrigerator compartment 11 is sucked from the suction port 56 through the cover 55 since the cool air is sucked from the axial direction and blows out in the radial direction. Air curtain blower 6
Sucked in 8. Then, the air is blown out to the rear curtain 57 for the air curtain, rises there, enters the top surface duct 64 for the air curtain, flows therethrough, and flows therethrough.
6 is blown out to the opening of the refrigerator compartment 11 below.

As a result, a cool air curtain is formed in the entire opening of the refrigerator compartment 11 as shown by the dashed arrow in FIG. 2, so that when the door 14 is opened, the refrigerator compartment 1 is opened.
The air curtain can prevent as much as possible the outside air trying to enter the inside 1 and the cool air trying to leak from inside the refrigerator compartment 11.

Here, the microcomputer M is connected to the door 14
When the door 14 is closed, the operation of the air curtain blower 68 is continued for the same time as the integrated time, and then the operation is stopped. Thereby, the temperature rise and the temperature unevenness in the refrigerating room 11 generated during the opening of the door 14 can be quickly reduced and made uniform after the door 14 is closed.

Further, when the temperature in the refrigerator compartment 11 rises to a high temperature such as + 6 ° C., for example, by inputting a large amount of heat load, the microcomputer 14 closes the door 14. Further, even after the lapse of the integration time, the air curtain blower 68 is operated until the OFF point is reached. Further, even after the compressor 69 stops, the air curtain blower 68 is operated for, for example, three minutes.

Thus, the cool air in the refrigerator compartment 11 is agitated, so that the temperature recovery (reduction) in the refrigerator compartment 11 is accelerated. In addition, the operation of the air curtain blower 68 as described above stirs the cool air in the refrigerator compartment 11, so that the temperature in the refrigerator compartment 11 also becomes uniform. Further, since the cool air curtain is formed when the door 14 is opened, it is possible to contribute to energy saving.

Further, even when the door 14 is closed, if the temperature in the refrigerator 11 rises to a predetermined value or more, the air curtain blower 68 is operated. Can be stirred by the operation of the air curtain blower 68, and the temperature recovery (reduction, especially the pocket inside the door 14 and the like) in the refrigerator compartment 11 can be accelerated.

Here, when the outside air temperature outputted from the outside air temperature sensor 87 is, for example, + 10 ° C. or less, the microcomputer M energizes the temperature compensating electric heater H to generate heat. The cool air in the air curtain rear duct 57 heated by the heat generated by the electric heater H is circulated in the refrigerator compartment 11 by the operation of the air curtain blower 68 as described above. It is heated and the temperature compensation function is significantly improved.

As a result, it is possible to automatically and effectively eliminate the inconvenience of supercooling the inside of the refrigerator compartment 11 at a low outside temperature such as in winter, thereby improving the usability.
Since unnecessary heat generation can be prevented, the power consumption of the electric heater H can also be reduced. Also, as described above, the air curtain blower 68 is operated for three minutes after the compressor 69 is stopped,
It is possible to effectively eliminate supercooling due to temperature inertia after the compressor 69 is stopped.

Next, the microcomputer M is connected to the compressor 6
When the total operating time reaches a predetermined time, the compressor 69 is stopped to cause the defrost heater 38 to generate heat, and the freezer compartment cooler 36 starts to be defrosted. Thereby, the refrigerator coolers 36 are heated, and the frost attached to them is melted. Drain water generated by melting of frost
It is received in a drain receptacle 39 arranged below the cooler. Then, when the temperature of the freezer compartment cooler 36 detected by the freezer compartment cooler temperature sensor 91 reaches a predetermined defrost end temperature, the heat generation of the defrost heater 38 is stopped and the freezer compartment cooler 36 is stopped. End the defrost.

Here, when starting the defrosting of the freezer cooler 36 in a state where the three-way valve 72 is open to the capillary tube 74 side, the microcomputer M switches the three-way valve 72 before starting the defrosting. The refrigerant is opened to the side of the capillary tube 73 for a minute and the refrigerant flows from the refrigerator 26 to the refrigerator 36. As a result, the refrigerant is also stored in the refrigerator cooler 26, so that the temperature rise of the refrigerator cooler 36 during the subsequent defrosting can be accelerated. In addition, since the low-temperature refrigerant is stored in the refrigerator cooler 26, the refrigerator compartment 1 during the defrosting of the refrigerator cooler 36.
1 can also be suppressed.

On the other hand, the three-way valve 72 is
For example, when the state in which the compressor 69 is operated while being opened to the third side is integrated for 320 minutes (when the refrigerator compartment 11 is under a high load,
Or, when the state in which the three-way valve 72 is open to the capillary tube 73 side continues for, for example, 40 minutes, or
In the case where the compressor 69 is stopped before the refrigerator compartment 11 reaches the OFF point, in any case, the integration becomes 120 minutes), after switching the three-way valve 72 to the capillary tube 74 side, or after stopping the compressor 69 Then, the refrigerating room blower 27 is operated.

That is, since the air in the refrigerator compartment 11 is circulated in a state where the refrigerant is not supplied to the refrigerator compartment cooler 26, the temperature of the refrigerator compartment cooler 26 rises.
This removes frost from the refrigerator compartment cooler 26 (this is called cycle defrost). Then, when the temperature of the refrigerator compartment cooler 26 detected by the refrigerator compartment cooler temperature sensor 91 rises to, for example, + 3 ° C., the microcomputer M stops the refrigerator compartment blower 27.

In addition to the control by the time integration, for example, before the temperature of the refrigerator compartment 11 reaches the OFF point, the compressor 6
If 9 stops, it is conceivable that the frost of the refrigerator compartment cooler 26 increases and the heat exchange efficiency decreases, so that in such a case, the cycle defrost may be started immediately.

When the cycle defrost is executed twice consecutively, the microcomputer M determines that the refrigerator-cooler cooler 26 has considerable frost, and
After the three-way valve 72 is opened to the capillary tube 74 side, or after the compressor 69 is stopped, the electric heater 28 of the refrigerator cooler 26 is energized and heated to perform defrosting by forced heating. Thereby, the frost blockage of the cooler 26 is reliably prevented. Similarly, when the temperature of the refrigerator cooler 26 rises to, for example, + 3 ° C., the power supply to the electric heater 28 is stopped, and the defrosting of the refrigerator cooler 26 ends.

In the embodiment, the three-way valve 72 is a motor-driven type. However, the present invention is not limited to this, and may be driven by an electromagnetic solenoid or the like.

[0080]

As described in detail above, according to the present invention, in a refrigerator having at least a freezer compartment and a refrigerator compartment, a reciprocating compressor, a condenser, an electric three-way valve, a first and a third valve are provided. A second decompression device, a refrigerator cooler, a refrigerator cooler, and a control device, the control device,
After the refrigerant discharged from the compressor is condensed in the condenser by switching the three-way valve based on the temperatures of the freezing compartment and the refrigerator compartment, the refrigerant for the refrigerating compartment is passed through the first decompression device from one outlet of the three-way valve. The two-chamber cooling mode in which the cooling device and the freezing room cooler are sequentially supplied, and the freezing room cooling mode in which the other outlet of the three-way valve is supplied to the freezing room cooler through the second pressure reducing device are selectively executed. So, the freezer compartment, by the freezer cooler,
The refrigerator compartments are independently cooled by the refrigerator coolers.

As a result, the cooling performance of each room is improved, and frost formation on the cooler for the freezing room is reduced as compared with the related art. In addition, the refrigerant is supplied to each cooler by one compressor, and particularly, when the compressor is stopped, the control device closes both outlets of the three-way valve. In addition, the movement of the refrigerant on the low pressure side is also prevented, and as a result, the cooling operation efficiency is significantly improved as a whole, thereby contributing to energy saving.

In particular, since an electric three-way valve such as a motor drive is used, it is possible to reliably shut off the high-pressure side and the low-pressure side due to the stoppage of the compressor despite the use of a reciprocating compressor. Is what you can do.

[Brief description of the drawings]

FIG. 1 is a front view of a refrigerator according to the present invention.

FIG. 2 is a vertical sectional side view of the refrigerator of the present invention.

FIG. 3 is an exploded perspective view of a back plate and a back heat insulating material of the refrigerator compartment of the refrigerator of the present invention.

FIG. 4 is a plan sectional view of a refrigerator compartment of the refrigerator of the present invention.

FIG. 5 is a plan sectional view of a partition wall portion of the refrigerator of the present invention.

FIG. 6 is a refrigerant circuit diagram of a refrigeration cycle of the refrigerator of the present invention.

FIG. 7 is a block diagram of a control device of the refrigerator of the present invention.

FIG. 8 is a perspective view of a refrigerator of the refrigerator of the present invention.

FIG. 9 is a side view of the cooler.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator 6 Insulated box 7 Partition wall 8 Upper partition member 11 Refrigerating room 11A Refrigerating room discharge opening 12 Vegetable room 12B Vegetable room discharging opening 13 Freezing room 13A Freezing room discharging opening 14, 16, 17, 18, 19 Door 26 Refrigerating room Room cooler 27 Refrigerator room blower 36 Freezer room cooler 37 Freezer room blower 40 Header 41 Machine room 69 Compressor 71 Condenser 72 Three-way valve 73, 74 Capillary tube 83 Freezer room temperature sensor 84 Refrigerator room temperature sensor C Control device M microcomputer

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideki Oyu 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. F-term (reference) 3L045 AA02 AA05 BA01 CA02 DA02 EA01 GA04 HA02 JA15 LA06 LA10 MA03 NA01 NA19 PA02 PA04 PA05

Claims (2)

[Claims] 1. A refrigerator comprising at least a freezer compartment and a refrigerator compartment, comprising: a reciprocating compressor, a condenser, an electric three-way valve,
A first decompression device, a second decompression device, a freezer compartment cooler, a refrigerator compartment cooler, and a control device. The control device controls the three-way valve based on the temperatures of the freezer compartment and the refrigerator compartment. By switching, after the refrigerant discharged from the compressor is condensed in the condenser, the refrigerator cooler and the freezer cooler pass through the first pressure reducing device from one outlet of the three-way valve. And a freezing room cooling mode in which the two-way cooling mode is sequentially supplied to the three-way valve and the freezing room cooling mode is supplied from the other outlet of the three-way valve to the freezing room cooler through the second pressure reducing device. When the machine stops, both outlets of the three-way valve are closed. 2. The refrigerator according to claim 1, wherein the three-way valve is driven by a motor.