JP3615433B2 - refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerator comprising at least a freezer compartment and a refrigerator compartment in a heat insulating box.
[0002]
[Prior art]
Conventionally, this kind of refrigerator has a freezer compartment, a refrigerator compartment, a vegetable compartment, etc. in the heat insulation box as shown in Japanese Utility Model Publication No. 6-12301 (F25D23 / 00). A cooling system and a blower are installed in the cooling chamber defined in the above, and the cooling air cooled by the cooler is supplied to each chamber by the blower and circulated to cool.
[0003]
In this case, by supplying cold air to the refrigerating chamber via a damper, the temperature in the refrigerating chamber is set to a predetermined refrigerating temperature, and the vegetable chamber is allowed to flow into the surroundings of the container after circulating the refrigerating chamber. The method of indirectly cooling the vegetables in the container was adopted.
[0004]
As described above, since all of the freezer compartment, the refrigerator compartment, and the vegetable compartment are conventionally cooled by a single cooler, the cooling performance of each compartment is inevitably lowered and becomes unstable and prevails. Therefore, a refrigerator for the refrigerator compartment is provided separately to cool the refrigerator compartment and the vegetable compartment, and the cooling function is demonstrated. By circulating the cold air to the refrigerator compartment etc. with a blower, the refrigerator compartment etc. is independent of the freezer compartment. Then, a cooling method can be considered.
[0005]
[Problems to be solved by the invention]
In this case, frost formation gradually grows in the freezer cooler (hereinafter referred to as the freezer cooler) and the refrigerating room cooler, and therefore defrosting must be performed. Since it is higher than the room, frost formation on the refrigerator for the refrigerator compartment is naturally less than that for the refrigerator for the freezer compartment. Usually, defrosting of the freezer cooler is performed by heating with a defrosting heater (electric heater), and such defrosting is similarly performed by the freezer cooler and the refrigerator freezer. Therefore, excessive defrosting is inevitably performed in the refrigerator for the refrigerator compartment, and the cooling capacity and the operation efficiency are lowered.
[0006]
The present invention has been made to solve the conventional technical problems, and includes a refrigerator for a refrigerator compartment for cooling a refrigerator compartment in addition to a refrigerator for a refrigerator compartment for cooling the refrigerator compartment. In this case, an object of the present invention is to provide a refrigerator that can accurately perform the defrosting of the refrigerator for the refrigerator compartment.
[0007]
[Means for Solving the Problems]
The refrigerator of the present invention comprises at least a freezing room and a refrigeration room in a heat insulating box, and includes a refrigerator, a refrigerator, a decompression device, etc., and a freezing room cooler and a refrigerating room cooling that constitute a refrigerant circuit. A refrigerating room fan that circulates cold air heat-exchanged with the refrigerating room cooler into the refrigerating room, a defrost heater that heats the refrigerating room cooler, and a control device. First refrigerator cooler defrost mode in which the refrigerator for the refrigerator compartment is operated in a state where the refrigerant supply to the refrigerator refrigerator is stopped, and the refrigerator compartment in a state where the refrigerant supply to the refrigerator refrigerator is stopped The second refrigerator cooler defrost mode for stopping the air blower and heating the defrost heater It is feasible, integrates the time for which the refrigerant is supplied to the refrigerator for the refrigerator compartment, executes the first refrigerator cooler defrosting mode at a constant integrated value, and When the state in which the refrigerant is being supplied is continued for a predetermined period, the integrated value is changed short, and when the first refrigerator cooler defrosting mode is changed a predetermined number of times, Execute the second refrigerator cooler defrost mode It is characterized by that.
[0008]
According to the present invention, in a refrigerator comprising at least a freezer compartment and a refrigerator compartment in a heat insulation box, a refrigerator for a freezer compartment and a refrigerator for a refrigerator compartment constituting a refrigerant circuit together with a compressor, a condenser, a decompressor, etc. A refrigerating room blower for circulating cold air exchanged with the refrigerating room cooler into the refrigerating room, a defrost heater for heating the refrigerating room cooler, and a control device. The first refrigeration room cooler defrosting mode for operating the refrigeration room blower with the refrigerant supply to the refrigeration cooler stopped, and the refrigeration room blower with the refrigerant supply to the refrigeration room cooler stopped And the second chiller defrost mode for causing the defrost heater to generate heat Because it was executable Refrigerating room cooling is accurately performed in combination with the first refrigerating room cooler defrosting mode that blows air in a state where the refrigerant supply is stopped, and the second refrigerating room cooler defrosting mode that is forcibly heated by the defrosting heater. The defrosting of the vessel can be realized, and the cooling performance and the operation efficiency can be improved.
[0009]
in this case, Accumulate the time for which the refrigerant is supplied to the refrigerator for the refrigerator compartment, execute the first refrigerator defrost mode with a constant integrated value, and supply the refrigerant to the refrigerator for the refrigerator compartment. The accumulated value is shortened when the Because I am trying to change The defrosting in the case where the heat exchange is reduced due to the increase in frost formation on the refrigerator for the refrigerator compartment can be executed at an early stage by blowing with the fan for the refrigerator compartment.
[0010]
And when the 1st refrigerator compartment defrost mode in the state changed further shorter is repeated predetermined times, the 2nd refrigerator compartment defrost mode is changed. Because I am trying to run Furthermore, in a situation where frost formation is expected to increase, frost formation is forcibly melted by the defrost heater, and it is possible to avoid a decrease in cooling performance and operating efficiency due to frost blockage. .
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings. 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 plan sectional view of the partition wall 7 portion of the refrigerator 1, FIG. 6 is a refrigerant circuit diagram of the refrigeration cycle of the refrigerator 1, and FIG. 7 is a diagram of the control device C of the refrigerator 1. It is a block diagram.
[0012]
The refrigerator 1 is composed of an outer box 2 made of a steel plate and a heat insulating box 6 having a front opening formed by filling a heat insulating material 4 such as foamed polyurethane in an in-situ foaming method between inner boxes 3 made of hard resin such as ABS. ing. The inside of the heat insulating box 6 is partitioned vertically 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 wall 7 is an upper partition. The member 8 is divided vertically.
[0013]
The upper partition member 8 is provided with a refrigerator compartment 11 and the upper partition member 8 and the partition wall 7 are provided with a vegetable compartment 12. Further, the opening edge of the heat insulating box 6 below the partition wall 7 is divided vertically by a lower partition member 9, and the lower side of the lower partition member 9 is a freezer compartment 13. Further, the partition wall 7 and the lower partition member 9 are further divided into left and right sides by a heat insulating wall 30 (FIG. 5), and the left side is an ice making chamber 10 and the right side is a select chamber 15 (FIG. 5). In FIG. 5, the hatching of the partition wall 7 is omitted for explanation.
[0014]
The front opening of the refrigerator compartment 11 is closed openably and closably by a rotatable heat insulating door 14, and the freezer compartment 13 and the vegetable compartment 12 are provided with drawer-type heat insulating doors 16 provided with containers 16 A and 17 A having top openings. 17 are each opened and closed freely. Further, the ice making chamber 10 is also opened and closed by a drawer-type heat insulating door 18 provided with a container 18A having an upper opening, and the select chamber 15 is also opened and closed by a similar drawer-type heat insulating door 19 (FIG. 1). Has been. Reference numeral 20 denotes a control panel provided at the lower front portion of the door 14.
[0015]
An automatic ice making machine 21 is installed in the upper part of the ice making chamber 10. Further, the interior of the vegetable compartment 12 is divided forward and backward by a partition plate 22 and a cooler front plate 23, and a cooling chamber 24 is formed on the rear side of the cooler front plate 23, and the refrigerator compartment 24 is refrigerated. A room cooler 26 is provided vertically. A refrigerating room blower 27 is provided above the refrigerating room cooler 26, and a defrost heater 28 is provided below the refrigerating room cooler 26. A drain receiver 29 is formed below the defrost heater 28.
[0016]
Further, from the back of the ice making chamber 10 and the select chamber 15 to the upper back of the freezing chamber 13 is partitioned forward and backward by a partition plate 32 and a cooler front plate 33, and a cooling chamber 34 is formed behind the cooler front plate 33. In this cooling chamber 34, a freezer cooler 36 is provided vertically. A freezer blower 37 is provided above the freezer cooler 36, and a defrost heater 38 is provided below the freezer cooler 36. A drain receiver 39 is formed below the defrost heater 38.
[0017]
An ice making chamber discharge port, a select chamber discharge port, and the like are formed in the upper portion of the partition plate 32, a freezer chamber discharge port 13A is formed in the center portion, and a freezer compartment suction port 13B is formed in the lower portion of the partition plate 32. Is formed. Note that a motor damper 76 (FIG. 7) that opens and closes the cool air flow path based on the temperature of the select chamber 15 is attached to the select chamber discharge port (not shown).
[0018]
On the other hand, a vegetable room suction port 12A is formed in the lower part of the partition plate 22 at the back of the vegetable room 12, and the upper end of the space between the partition plate 22 and the cooler front plate 23 communicates with a refrigeration room rear duct 47 described later. . Furthermore, the vegetable compartment discharge port 12B for blowing cold air to the lower side of the upper partition member 8 is formed in the upper part of the partition plate 22.
[0019]
On the other hand, a back plate 49 and a back heat insulating material 50 are attached to the back side of the back of the inner box 3 at a distance from the back of the inner box 3 at the back of the refrigerator compartment 11. The refrigerator compartment rear duct 47 extending is formed. A refrigerator discharge port 11 </ b> A is formed on the left and right sides of the back plate 49 and penetrates the back heat insulator 50 and communicates with the refrigerator back duct 47. Further, a plurality of shelves 51 are built in the refrigerator compartment 11.
[0020]
In addition, on the left and right sides of the back plate 49, recessed portions 31 and 31 are formed on both sides of the back heat insulating material 50 and extend in the vertical direction, and an illumination lamp 59 is attached in each of the recessed portions 31 and 31. The front surfaces of the recesses 31 are closed by a light-transmitting shade (not shown) (note that the left side illumination lamp 59 is seen through in FIG. 2).
[0021]
Furthermore, a partition plate 42 is attached to the lower part of the refrigerator compartment 11 at a predetermined interval above the upper partition member 8, and an openable / closable lid 43 is rotatable on the front side of the partition plate 42. A built-in chamber 44 is formed in a space that is suspended and surrounded by these. The built-in chamber 44 is set to an ice temperature temperature zone. A retractable container 48 is accommodated in the built-in chamber 44. Reference numeral 44A denotes a built-in chamber discharge port formed in the back plate 49, which communicates with the lower part of the refrigerator compartment back duct 47.
[0022]
The upper partition member 8 is formed with a refrigerator compartment suction port 51, and the refrigerator compartment inlet port 51 communicates with the vegetable compartment 12. Furthermore, a water supply tank (not shown) for supplying water to the automatic ice making machine 21 is stored in the built-in chamber 44.
[0023]
The upper surface of the container 17A stored in the vegetable compartment 12 is closed with a lid 53, and the cold air returning from the refrigerator compartment 11 is circulated around the container 17A through the refrigerator compartment suction port 51, It is returned to the cooling chamber 24 from the vegetable chamber inlet 12A. The return cold air from the ice making chamber 10 and the freezing chamber 13 is returned to the cooling chamber 34 from the freezer inlet 13B. The select chamber 15 is returned to the cooling chamber 34 from a select chamber suction port (not shown).
[0024]
Here, a recessed portion 54 that is recessed in the vertical direction is formed in the front central portion of the rear heat insulating material 50, and a suction port 56 is attached to the rear plate 49 at a position corresponding to the lower portion of the recessed portion 54. ing. An air curtain rear duct 57 is formed in the recessed portion 54 closed by the rear plate 49, and a temperature compensating electric heater H is attached therein. Reference numeral 55 denotes a cover attached to the suction port 56.
[0025]
An air curtain blower 68 provided with a turbo fan 67 that sucks cold air from the axial direction (front) and blows it out in the radial direction is disposed in the air curtain rear duct 57 located behind the suction port 56. A top plate 63 is attached to the top surface of the refrigerator compartment 11, and an air curtain top surface duct 64 is formed in the top surface plate 63 in the front-rear direction. The rear end of the air curtain top face duct 64 communicates with the upper end of the air curtain rear face duct 57, and the front end of the air curtain top face duct 64 is located near the front opening of the refrigerator compartment 11. A plurality of air outlets 66 are arranged side by side (note that the blower 68 is seen through in FIG. 2).
[0026]
On the other hand, a machine room 41 is formed in the lower part of the heat insulation box 6, and the refrigerant circuit of the refrigeration cycle of FIG. And a machine room blower 94 (FIG. 7) are installed. In the refrigerant circuit diagram of FIG. 6, 71 is a condenser, 72 is a motor-driven three-way valve, and 73 and 74 are capillary tubes as decompression devices. 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.
[0027]
The refrigerant discharge pipe 69D of the compressor 69 is connected to the condenser 71, and the outlet portion 71A of the condenser 71 is connected to the three-way valve 72 via the dryer 70. One outlet of the three-way valve 72 is connected to the inlet of the refrigerating room cooler 26 via the capillary tube 73, and the outlet of the refrigerating room cooler 26 is connected to the inlet of the freezing room cooler 36.
[0028]
The other outlet of the three-way valve 72 is connected to the inlet of the freezer cooler 36 via the capillary tube 74, and the outlet of the freezer cooler 36 is connected to the refrigerant suction pipe 69S of the compressor 69. Yes. The three-way valve 72 has a function of opening and closing the outlet so that the liquid refrigerant from the condenser 71 can be selectively flowed to the capillary tube 73 or the capillary tube 74, and closes both outlets to completely close the flow path. It also has a function and a function of opening both outlets. Reference numeral 40 denotes a header serving as a refrigerant liquid reservoir connected between the freezer cooler 36 and the compressor 69.
[0029]
Here, FIG. 8 and FIG. 9 show perspective views of the refrigerator 26 for refrigerator compartment or the refrigerator 36 for freezer compartment. Both of the coolers are so-called fin tube type heat exchangers, and the basic structure is the same even if there are differences in dimensions and the like. That is, the refrigerator 26 for the refrigerator compartment includes a refrigerant pipe 77 bent in a meandering manner and a plurality of aluminum heat exchange fins 78... Fitted into the refrigerant pipe 77.
[0030]
In the embodiment, the refrigerant pipes 77 are configured in three front and rear rows (77A for the rightmost column in the drawing, 77B for the central refrigerant tube, and 77C for the leftmost refrigerant tube). The pipes 77A to 77C are bent three times in the horizontal direction across the top and bottom.
[0031]
On the other hand, each fin 78 has the same shape, and a circular fitting having an inner diameter substantially the same as the outer diameter of the refrigerant pipe 77 so that the refrigerant pipe 77 is inserted and fitted in one side portion. A plurality of holes 79 are formed at predetermined intervals in the vertical direction. In addition, on the other edge of the fin 78, a plurality of oval cutouts 81 that are cut inwardly are formed vertically at the same interval as the fitting hole 79.
[0032]
The depth of each notch 81 is a semicircular shape having an inner diameter substantially the same as the outer diameter of the refrigerant pipe 77, and extends horizontally toward the edge. Further, the distance from the edge on the other side to the center of the circular portion at the back of the notch 81 is the same as the distance from the edge on one side to the center of the fitting hole 79.
[0033]
With the above configuration, by inserting and fitting the refrigerant pipe 77A into the fitting hole 79 of the fin 78, the plurality of fins 78 are inserted and fixed to the refrigerant pipe 77A at predetermined intervals. Further, the refrigerant pipe 77C is also inserted and fitted into the fitting hole 79 of the fin 78, thereby inserting and fixing the plurality of fins 78 through the refrigerant pipe 77C at predetermined intervals. At this time, the fins 78... Of the refrigerant pipe 77 C are attached so as to be shifted from the positions of the fins 78.
[0034]
Next, the notches 81 of the fins 78 of the refrigerant pipes 77A and 77C are opposed to each other so that the refrigerant pipe 77B is first opposed to the notches 81 of the fins 78 of the refrigerant pipe 77A.・ ・ Insert from the edge to fit inside. Next, the refrigerant pipe 77B is inserted into the notches 81... Of the fins 78 of the refrigerant pipe 77C from the edge and fitted into the innermost part.
[0035]
By such fitting, the refrigerant pipe 77A and the fins 78... And the refrigerant pipe 77C and the fins 78... Are firmly integrated with each other through the refrigerant pipe 77B. Further, in the central portion 82 (refrigerant piping 77B portion) of the refrigerator 26 for the refrigerator compartment, the fins 78 of both the refrigerant pipings 77A and 77C overlap each other, so that the central portion 82 is dense and both sides are sparse. The fin arrangement can be realized. Thereby, it is possible to delay the blockage due to frost in the sparse part while improving the heat exchange performance in the dense part.
[0036]
Further, since the shapes of all the fins can be made the same, the investment cost of the mold can be reduced, and a low-cost heat exchanger can be realized.
[0037]
Next, in FIG. 7, the control device C is configured by a general-purpose microcomputer M, and the input is a freezer temperature sensor 83 for detecting the temperature of the freezer compartment 13, and the temperature of the refrigerator compartment 11 is detected. A refrigerating room temperature sensor 84, a select room temperature sensor 86 for detecting the temperature of the select room 15, an outside air temperature sensor 87 for detecting the ambient temperature around the refrigerator 1, and the illuminance around the refrigerator 1 ( Brightness sensor), a refrigerator temperature sensor 89 for detecting the temperature of the refrigerator 26, a refrigerator temperature sensor 91 for detecting the temperature of the refrigerator 36, A setting switch 92 and an energy saving switch 93 are connected. The setting switch 92 and the energy saving switch 93 are arranged on the control panel 20.
[0038]
The output of the microcomputer M is connected to the compressor 69, the machine room blower 94, the freezer compartment blower 37, and the refrigerator compartment blower 27 through inverter circuits 98, 99, 101, and 102, respectively. The air curtain blower 68, the three-way valve (motor) 72, the defrost heaters 38 and 28, the temperature compensating electric heater H, the motor damper 76 and the ice making machine 21 are connected. Further, a display 96 made of LEDs and an electronic sound generator 97 are connected to the output of the microcomputer M, and these are also arranged on the control panel 20.
[0039]
Next, the operation of the refrigerator 1 according to the present invention will be described. First, the temperature setting operation of each chamber will be described. The microcomputer M digitally displays the temperature of the freezer compartment 13 (and the temperature of the refrigerator compartment 11) on the display 96 based on the outputs of the temperature sensors 83 and 84. Moreover, based on the pressing operation of the freezer compartment temperature setting switch of the setting switch 92, the preset temperature of the freezer compartment 13 is set in the range of, for example, −18 ° C. (upper limit) to −28 ° C. (lower limit), and the display At 96, a bar is displayed (displayed by the number of lighting of a plurality of LED rows).
[0040]
In this case, the microcomputer M generates an electronic sound “pi” once by the electronic sound generator 97 every time the freezer temperature setting switch is pressed. In addition, the set temperature is changed 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 generates an electronic sound twice (total three times when pressed) by the electronic sound generator 97. Further, when the temperature reaches −28 ° C., an electronic sound is generated once (a total of twice when pressed).
[0041]
As a result, even when a visually impaired person operates, it is possible to determine that the set temperature has reached the upper limit value or the lower limit value. In the embodiment, the upper limit value or the lower limit value is notified by the number of occurrences of the electronic sound, but the scale and sound quality of the electronic sound may be changed. When the freezer temperature setting switch is pressed and released for a moment, the microcomputer M changes the set temperature by 2 ° C., for example. .
[0042]
The setting switch 92 is also provided with a refrigerator temperature setting switch, and the setting temperature can be set, for example, in the range of + 1 ° C. (lower limit value) to + 5 ° C. (upper limit value) by the same method. The setting switch 92 is also provided with a select room setting switch, whereby the temperature setting of the select room 15 can be changed to a refrigeration temperature or a freezing temperature. The microcomputer M sets the ON point-OFF point with a differential of, for example, 3 ° C. above and below the set temperature of each chamber. At this time, based on the output of the outside air temperature sensor 87, for example, when the outside air temperature is + 20 ° C. or lower, the differential of the refrigerator compartment 11 is set to 2 ° C. to stabilize the temperature control.
[0043]
On the other hand, when the energy saving switch 93 is pressed, the microcomputer M enters the energy saving mode, and the set temperature of each room is uniformly increased by 1 ° C., for example. In this case, when the microcomputer M determines that the illumination is low at night based on the output of the optical sensor 88, for example, the temperature increase width is set to 2 ° C. Thereby, since the electric power required for the cooling operation mentioned later is reduced, it becomes energy saving and an electric charge can also be reduced now.
[0044]
Thus, the power consumption of the refrigerator 1 can be reduced in situations where the load in the cabinet is expected to lighten, particularly in situations where food is not taken in and out. If any of the doors 14, 16, 18, 19 is opened during the energy saving mode, the microcomputer M cancels the energy saving mode.
[0045]
Basically, the microcomputer M uses the inverter circuit 98 to set the operation frequency of the compressor 69 to 5 steps of 37HZ, 48HZ, 58HZ, 64HZ, 68HZ including stop (normally when the outside air temperature is below + 27 ° C). It can be changed at 37HZ, and at 48HZ at the above.
[0046]
The microcomputer M applies sine wave three-phase power to each phase (R phase, S phase, T phase) of the compressor 69 by an inverter circuit 98 (PWM control). Thereby, compared with the case where a rectangular wave is applied, driving vibration and noise can be reduced and energy saving can be achieved.
[0047]
In addition, the freezer blower 37 and the cold room blower 27 are, for example, 700 rpm to 1500 rpm including the stop by the inverter circuits 101 and 102 (the freezer blower 37 is usually 1300 rpm and the cold room blower 27 is usually 1000 rpm). The range can be changed. Furthermore, the machine room blower 94 can be changed by, for example, 1200 rpm (when the compressor 69 is operating at 37HZ and 48HZ) and 1400 rpm (when the compressor 69 is operating at 58HZ, 64HZ and 68HZ), including stopping by the inverter circuit 99. ing.
[0048]
Further, the machine room blower 94 is basically operated in synchronization with the compressor 69, but is stopped based on the output of the outside air temperature sensor 87, for example, when the outside air temperature is + 10 ° C. or lower.
[0049]
When the cooling operation is started and the compressor 69 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 to dissipate heat and condense. Liquefied. The refrigerant exiting the condenser 71 enters the three-way valve 72 through the dryer 70.
[0050]
When the temperatures of the freezer compartment 13 and the refrigerator compartment 11 detected by the temperature sensors 83 and 84 are high (when the temperature does not reach the OFF point), the microcomputer M opens the three-way valve 72 toward the capillary tube 73, and the capillary tube 74. Close the side. As a result, the refrigerant condensed and liquefied by the condenser 71 is decompressed by the capillary tube 73, and then sequentially flows into the refrigerating room cooler 26 and the freezing room cooler 36 to evaporate. 36 demonstrates cooling capacity.
[0051]
When the temperature of the refrigerator compartment 11 reaches the OFF point based on the output of the temperature sensor 84 from this state, the microcomputer M opens the three-way valve 72 to the capillary tube 74 side and closes the capillary tube 73 side. As a result, the refrigerant condensed and liquefied by the condenser 71 is decompressed by the capillary tube 74, then flows into the freezer cooler 36 and evaporates, and the freezer cooler 36 exhibits a cooling capacity. When the temperature of the freezer compartment 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.
[0052]
By closing the three-way valve 72, the refrigerant circuit is completely isolated from the high-pressure side and the low-pressure side, so that the inconvenience of high-temperature refrigerant naturally flowing from the high-pressure side to the low-pressure side is prevented. Thereby, unnecessary temperature rise and pressure rise of each cooler 26 and 36 are avoided, operation efficiency is improved, and energy is saved.
[0053]
Further, since the compressor 69 is constituted by a reciprocating compressor, it is difficult to take a differential pressure while the compressor is stopped as compared with a rotary compressor. However, a flow path is provided by a motor-driven three-way valve 72. Since it closes, the high-low pressure difference in a refrigerant circuit can be maintained reliably. When the temperature of the freezer compartment 13 rises to the ON point, the microcomputer M operates the compressor 69 again and opens the three-way valve 72 to the capillary tube 74 side. The microcomputer M controls the operation / stop of the compressor 69 at the temperature of the freezer compartment 13, opens the three-way valve 72 toward the capillary tube 74, and opens the three-way valve 72 toward the capillary tube 73 according to the temperature of the refrigerator compartment 11. I do.
[0054]
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 to the capillary tube 73 side again, and the capillary tube 74 side. Close. When the temperature of the freezer compartment 13 detected by the temperature sensor 83 is, for example, −5 ° C. or higher, the operating frequency of the compressor 69 is increased step by step until the OFF point is reached.
[0055]
While the temperatures of the chambers 11 and 13 rise from the OFF point to the ON point, the blowers 27 and 37 are basically stopped and operated from the ON point to the OFF point. In either case, operation control is performed independently. When the freezer blower 37 is operated, the cool air in the cooling chamber 34 cooled by the freezer cooler 36 is discharged from the ice making chamber discharge port and the select chamber discharge port to the ice making chamber 10 and the select chamber 15. At the same time, it is discharged into the freezer compartment 13 from the freezer outlet 13A. And after circulating and cooling each room | chamber interior, cold air returns in the cooling chamber 34 from the said freezer compartment inlet 13B (solid line arrow in FIG. 2). As a result, the inside of the freezer compartment 13 is maintained at a set temperature.
[0056]
The temperature in the ice making chamber 10 is also set to the freezing temperature, and ice making is performed 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 cold air supplied from the discharge outlet of the select chamber, so that the select chamber 15 becomes the selected refrigerating chamber or freezer chamber.
[0057]
On the other hand, when the refrigeration room blower 27 is operated, the cold air in the cooling chamber 24 cooled by the refrigeration room cooler 26 flows into the refrigeration room rear duct 47, and the refrigeration room discharge port 11A. The air is discharged from the chamber discharge port 44 </ b> A into the refrigerator compartment 11 and the built-in chamber 44.
[0058]
The cold air flowing into the refrigerator compartment suction port 51 passes through the upper partition member 8 and is mixed with the cold air blown out from the vegetable compartment discharge port 12B (part of the cold air immediately after heat exchange with the refrigerator 26 for the refrigerator compartment). After entering the vegetable compartment 12 and circulating around the container 17 </ b> A to indirectly cool the inside of the container 17 </ b> A, it is sucked from the vegetable compartment suction port 12 </ b> A and returned to the cooling chamber 24. Thus, the inside of the refrigerator compartment 11 is maintained at a set temperature, and the vegetables in the container 17A are kept cold in a state where drying is prevented (solid arrow in FIG. 2).
[0059]
As described above, the freezing room 13, the ice making room 10, and the select room 15 that require a freezing temperature are cooled by the freezer cooler 36, and the refrigerating room 11 and the vegetable room 12 having relatively high temperatures are cooled by the refrigerating room cooler. Therefore, the cooling operation efficiency is remarkably improved as compared with the conventional case where each chamber is cooled by a single cooler.
[0060]
Further, in the refrigerator compartment 11 and the vegetable compartment 12, the cold air that has passed through the refrigerator compartment 11 and the built-in chamber 44 flows into the vegetable compartment 12, and the direct cold air from the refrigerator compartment fan 27 is mixed therewith. Insufficient cooling of the chamber 12 is also eliminated.
[0061]
When the microcomputer M switches from the state in which the three-way valve 72 is opened to the capillary tube 74 side to the side opened to the capillary tube 73 side, the start of the operation of the refrigerator 27 for the refrigerator compartment is delayed by, for example, 3 minutes. Here, in a state where the three-way valve 72 is open to the capillary tube 74 side, the refrigerant does not flow into the refrigerating room cooler 26, and therefore the excess refrigerant is stored in the header 40. Moreover, the temperature of the refrigerator 26 for refrigerator compartments is comparatively high, and the internal pressure is also high.
[0062]
Therefore, when the three-way valve 72 is opened to the capillary tube 73 side, the pressure in the refrigerating room cooler 26 moves to the freezing room cooler 36, and the liquid refrigerant in the header 40 is liquid-backed toward the compressor 69 side. However, if the start of operation of the refrigerating room blower 27 is delayed as described above, the temperature drop of the refrigerating room cooler 26 can be promoted, and thus the occurrence of such liquid back is prevented. Or it becomes possible to suppress.
[0063]
Further, when the temperature in the refrigerating chamber 11 becomes, for example, 6 ° C. higher than the ON point, or when the three-way valve 72 is opened to the capillary tube 73 side, for example, 60 minutes have passed (the high temperature in the refrigerating chamber 11). At the time of loading), the microcomputer M increases the number of rotations of the refrigerator fan 27 to 1300 rpm. Furthermore, when the compressor 69 is continuously operated for 60 minutes, for example, the operation frequency of the compressor 69 is increased by one step until the refrigerator compartment 11 reaches the OFF point.
[0064]
Further, when any one of the doors 14 and 17 is opened, the microcomputer M stops the refrigerating room blower 27, and when any one of the doors 16, 18, and 19 is opened, the freezer compartment. The blower 37 is stopped. This suppresses cold air leakage from each chamber.
[0065]
Further, the microcomputer M stops the air curtain blower 68 when the door 14 of the refrigerator compartment 11 is closed and the temperature in the refrigerator compartment 11 is lower than a predetermined high temperature such as + 6 ° C. ing. When the door 14 is opened, the microcomputer M operates the air curtain blower 68 (the illumination lamp 59 is also turned on).
[0066]
When the air curtain blower 68 is operated, cold air is sucked from the axial direction and blown in the radial direction, so that the cold air in the refrigerator compartment 11 is sucked from the suction port 56 via the cover 55 and is used for the air curtain. It is sucked into the blower 68. Then, it is blown out to the air curtain rear duct 57, rises there, enters the air curtain top duct 64, flows forward there, and is blown out from the blower outlet 66 to the opening of the lower refrigerator compartment 11. .
[0067]
As a result, a cold air curtain is formed over the entire area of the opening of the refrigerating chamber 11 as indicated by the broken line arrow in FIG. 2, so that the outside air that attempts to enter the refrigerating chamber 11 when the door 14 is opened And the cold air which is going to leak from the inside of the refrigerator compartment 11 can be prevented as much as possible by the air curtain.
[0068]
Here, the microcomputer M accumulates the time during which the door 14 is opened, and when the door 14 is closed, the operation of the air curtain blower 68 is continued for the same time as the accumulated time. Then stop. Thereby, after the door 14 is closed, the temperature rise and the temperature unevenness in the refrigerator compartment 11 generated while the door 14 is opened can be quickly reduced and made uniform.
[0069]
Further, when the temperature in the refrigerator compartment 11 rises to a high temperature such as + 6 ° C. or more due to a large amount of heat load, for example, the microcomputer M closes the door 14 and further performs the integration. Even after the time has elapsed, the air curtain blower 68 is operated until the OFF point is reached. Further, even after the compressor 69 is stopped, the air curtain blower 68 is operated for 3 minutes, for example.
[0070]
Thereby, since the cold air in the refrigerator compartment 11 is stirred, the temperature recovery (decrease) in the refrigerator compartment 11 is speeded up. In addition, the air in the refrigerator compartment 11 is agitated by the operation of the air curtain blower 68 as described above, so that the temperature in the refrigerator compartment 11 becomes uniform. Moreover, since the cold air curtain is formed when the door 14 is opened, it can contribute to energy saving.
[0071]
Further, even when the door 14 is closed, when the temperature in the refrigerator compartment 11 rises to a predetermined value or more, the air curtain blower 68 is operated. Stirring is performed by the operation of the air blower 68, and the temperature recovery (decrease, especially the pocket inside the door 14) in the refrigerator compartment 11 can be speeded up.
[0072]
Here, when the outside air temperature output 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 cold air in the air curtain rear duct 57 heated by the heat generated by the electric heater H is circulated in the refrigerating chamber 11 by the operation of the air curtain blower 68 as described above. Heated, the temperature compensation function is significantly improved.
[0073]
As a result, it is possible to automatically and effectively eliminate the inconvenience that the inside of the refrigerator compartment 11 is supercooled at low outside temperatures such as in winter, improving usability and preventing unnecessary heat generation. The power consumption of the electric heater H can also be reduced. Further, as described above, since the air curtain blower 68 is operated for 3 minutes after the compressor 69 is stopped, it is possible to effectively eliminate the supercooling due to the temperature inertia after the compressor 69 is stopped.
[0074]
Next, the microcomputer M integrates the operation time of the compressor 69, and when the total operation time reaches a predetermined time, the compressor 69 is stopped and the defrost heater 38 is caused to generate heat, and the freezer cooler 36 defrosting begins. Thereby, the cooler 36 for freezer compartments is heated, and the frost adhering to them is melted. Drain water generated by melting frost is received by a drain receiver 39 disposed on the lower side of the cooler. When the temperature of the freezer cooler 36 detected by the freezer cooler temperature sensor 91 reaches a predetermined defrosting end temperature, the heat generation of the defrost heater 38 is stopped and the freezer cooler 36 Finish defrosting.
[0075]
Here, when the microcomputer M starts 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 three-way valve 72 is opened for 3 minutes before starting the defrosting. It opens to the 73 side, and a refrigerant | coolant is poured from the refrigerator 26 for refrigerator compartments to the cooler 36 for freezing. As a result, the refrigerant is also stored in the refrigerating room cooler 26, so that the temperature rise of the freezing room cooler 36 during the subsequent defrosting can be accelerated. Moreover, since a low temperature refrigerant | coolant is stored in the refrigerator 26 for refrigerator compartments, the temperature rise of the refrigerator compartment 11 during the defrosting of the refrigerator 36 for freezer compartments can also be suppressed.
[0076]
On the other hand, the microcomputer M integrates the state where the three-way valve 72 is opened to the capillary tube 73 side and the compressor 69 is operating. For example, when the microcomputer 69 is integrated for 320 minutes, the three-way valve 72 is moved to the capillary tube 74 side. After switching or stopping the compressor 69, the refrigerator 27 for refrigerator is operated.
[0077]
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 refrigerator 26, the temperature of the refrigerator compartment refrigerator 26 rises. As a result, frost formation in the refrigerator 26 for the refrigerator compartment is removed (hereinafter referred to as cycle defrost). When the temperature of the refrigerator for the refrigerator compartment 26 detected by the refrigerator temperature sensor 91 for the refrigerator compartment rises to, for example, + 3 ° C., the microcomputer M stops the fan 27 for the refrigerator compartment and ends the cycle defrost. (First refrigerator cooler defrost mode).
[0078]
In addition to the control based on time integration, for example, when the compressor 69 is stopped before the temperature of the refrigerator compartment 11 reaches the OFF point, frost formation of the refrigerator 26 for the refrigerator compartment increases and the heat exchange efficiency decreases. In this case, the cycle defrost may be started immediately.
[0079]
Here, the microcomputer M has a high load in the refrigerator compartment 11, or when the three-way valve 72 is open on the capillary tube 73 side for 40 minutes, for example, or the refrigerator compartment 11 reaches the OFF point. When any situation occurs when the compressor 69 has been stopped before, the integration time (320 minutes) is shortened to 120 minutes.
[0080]
That is, in such a case, it is expected that frost is growing in the refrigerator 26 for the refrigerator compartment and the heat exchange efficiency is expected to decrease, and therefore, cycle defrosting is started early.
[0081]
When the cycle defrost is continuously executed twice in a situation where the integration time is shortened as described above, the microcomputer M has a considerable amount of frost formation in the refrigerator 26 for the refrigerator compartment, and the cycle defrost Therefore, the three-way valve 72 is opened to the capillary tube 74 side, or after the compressor 69 is stopped, the refrigerator fan 27 is stopped and the electric heater 28 of the refrigerator 26 is cooled. Is energized (second refrigerating room cooler defrosting mode).
[0082]
Thereby, the refrigerator 26 for refrigerator compartments defrosts by forced heating, and the frost blockage | closure of the cooler 26 is prevented reliably. Similarly, when the temperature of the refrigerator for the refrigerator compartment 26 rises to, for example, + 3 ° C., the energization to the electric heater 28 is stopped, and the heating and defrosting of the refrigerator for the refrigerator compartment 26 is ended. In addition, the drain water produced by the melting of frost is received in the drain receiver 29 similarly arranged on the lower side of the cooler.
[0083]
As described above, the frost formation state of the refrigerator 26 for the refrigerator compartment is predicted according to the operation state of the three-way valve 72 and the compressor 69, the cycle defrost is first executed, and a large amount of frost formation is expected. In this case, since the heating and defrosting is performed by the defrosting heater, excessive heating of the refrigerator 26 for the refrigerator compartment can be prevented and accurate defrosting can be realized.
[0084]
In the embodiment, the refrigerator for the refrigerator compartment 26 and the refrigerator for the freezer compartment 36 are connected in series, and whether the refrigerant is allowed to flow through the three-way valve 72 or only to the refrigerator for the freezer compartment 36 is determined. Although the present invention has been described with a refrigeration cycle that is switched and controlled, for example, a refrigeration cycle in which a refrigerator for a freezer and a refrigerator for a refrigerator are connected in parallel and refrigerant is distributed to one or both by a three-way valve. The present invention is effective.
[0085]
【The invention's effect】
As described above in detail, according to the present invention, in a refrigerator having at least a freezing room and a refrigeration room in a heat insulating box, a refrigerator for freezing room and a refrigeration constituting a refrigerant circuit together with a compressor, a condenser, a decompression device, and the like. A cooler for the room, a fan for the refrigerating room for circulating the cold air exchanged with the cooler for the refrigerating room, a defrost heater for heating the cooler for the refrigerating room, and a control device. The first refrigeration room cooler defrost mode for operating the refrigeration room blower in a state where the refrigerant supply to the refrigeration room cooler is stopped by the apparatus, and the state where the refrigerant supply to the refrigeration room cooler is stopped The second refrigerator cooler defrost mode in which the fan for the refrigerator is stopped and the defrost heater is heated. Was made executable, Refrigerating room cooling is accurately performed in combination with the first refrigerating room cooler defrosting mode that blows air in a state where the refrigerant supply is stopped, and the second refrigerating room cooler defrosting mode that is forcibly heated by the defrosting heater. The defrosting of the vessel can be realized, and the cooling performance and the operation efficiency can be improved.
[0086]
in this case, Accumulate the time for which the refrigerant is supplied to the refrigerator for the refrigerator compartment, execute the first refrigerator defrost mode with a constant integrated value, and supply the refrigerant to the refrigerator for the refrigerator compartment. The accumulated value is shortened when the Because I am trying to change Defrosting when heat exchange is reduced due to an increase in frost formation on the refrigerator for the refrigeration room can be executed early by blowing with a fan for the refrigeration room.
[0087]
And when the 1st refrigerator compartment defrost mode in the state changed further shorter is repeated predetermined times, the 2nd refrigerator compartment defrost mode is changed. Because I am trying to run Furthermore, in a situation where frost formation is expected to increase, frost formation is forcibly melted by the defrost heater, and it is possible to avoid a decrease in cooling performance and operating efficiency due to frost blockage. .
[Brief description of the drawings]
FIG. 1 is a front view of a refrigerator according to the present invention.
FIG. 2 is a vertical 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 portion 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 the refrigeration cycle of the refrigerator of the present invention.
FIG. 7 is a block diagram of the refrigerator control device of the present invention.
FIG. 8 is a perspective view of a refrigerator cooler of the present invention.
FIG. 9 is a side view of the cooler.
[Explanation of symbols]
1 Refrigerator
6 Insulated box
7 Partition wall
8 Upper partition member
11 Cold room
11A Refrigeration room outlet
12 Vegetable room
12B Discharge port for vegetable room
13 Freezer room
13A Freezer outlet
14, 16, 17, 18, 19 Door
26 Refrigerator cooler
27 Blower for refrigerator compartment
28, 38 Defrost heater
36 Freezer cooler
37 Blower for freezer
41 Machine room
56 Suction port
69 Compressor
71 condenser
72 3-way valve
73, 74 Capillary tube
C controller
M microcomputer

Claims (1)

In a refrigerator comprising at least a freezer compartment and a refrigerator compartment in an insulated box,
Refrigerating room cooler and refrigerating room cooler constituting a refrigerant circuit together with a compressor, a condenser, a decompression device, and the like, and a refrigerating room blower that circulates cold air exchanged with the refrigerating room cooler into the refrigerating room And a defrost heater that heats the refrigerator for the refrigerator compartment, and a control device, and the controller operates the blower for the refrigerator compartment in a state where the supply of the refrigerant to the refrigerator for the refrigerator compartment is stopped. The first refrigeration room cooler defrosting mode, and the second refrigeration that stops the refrigeration room blower while the refrigerant supply to the refrigeration room cooler is stopped and causes the defrost heater to generate heat. The room cooler defrost mode can be executed, the time during which the refrigerant is supplied to the refrigerator cooler is integrated, and the first refrigerator cooler defrost mode is set at a constant integrated value. A state in which refrigerant is supplied to the refrigerator for the refrigerator compartment If the integrated value is shortened for a predetermined period of time and the first refrigerator cooler defrosting mode is repeated a predetermined number of times, the integrated value is shortened for a predetermined number of times. A refrigerator characterized by executing a cooler defrosting mode.

Images