JP6811371B2 - refrigerator - Google Patents

Description

The present invention relates to a refrigerator provided with a cold storage material.

Conventionally, as a refrigerator equipped with a cold storage material, a refrigerator for reducing power consumption has been proposed. (See, for example, Patent Document 1)
Patent Document 1 describes a normal operation in which the internal space of the box is partitioned by a partition wall, a freezing chamber having a cold storage material inside is provided, and a cooling operation is performed so that the temperature in the freezing chamber becomes a predetermined first temperature. The cold storage operation, in which the cooling operation is performed so that the temperature in the freezer chamber becomes the second temperature lower than the first temperature, is selectively performed, and the cold storage material has a freezing point lower than the first temperature and higher than the second temperature. It has been proposed to reduce the peak power consumption by using a latent heat storage material that has and stores latent heat due to phase change as cold heat.

Japanese Unexamined Patent Publication No. 2012-242064

In the above-mentioned conventional refrigerator, since the cold storage material is provided on the partition wall constituting the inner wall surface of the storage chamber, the thickness of the partition wall becomes large and the internal volume of the storage chamber becomes small. Further, if the partition wall has an uneven shape, there is a problem that the cold storage material also has a complicated structure according to the shape.

In order to solve the above conventional problems, the refrigerator of the present invention includes a storage chamber to be cooled by the operation of the compressor, a cooler for cooling the storage compartment, the cold accumulating material which changes phase, and the A refrigerator having a cooling chamber having a cooler and the cold storage material and the storage chamber in front of the cooling chamber, the cold storage material is in contact with or close to the cooler and cooled by the cooler. The storage chamber is cooled by the cold heat of the cold storage material and the cooler, and has a return duct of the storage chamber next to the cooler, and the cold storage material is of the cooler on the return duct side. It is arranged so as to cover the side portion, and the lower end portion of the cold storage material is arranged so as not to cover at least the lowermost stage refrigerant pipe of the cooler in which the refrigerant pipes are formed in a plurality of serpentine stages .

As a result, when the load is applied when the food is taken in and out, the temperature rise in the storage chamber is reduced and the drive speed of the compressor is operated at a lower speed than before because the heat storage material and the cooler are cooled by the cooling amount. Since the compressor is allowed to cool while being released, the energy efficiency can be improved by improving the cooling performance while suppressing the operation due to the high rotation of the compressor.

The refrigerator of the present invention can reduce the power consumption during the daytime during actual use or when the load amount due to opening and closing the door is large.

Front view of the refrigerator according to the embodiment of the present invention Longitudinal section of the refrigerator according to the embodiment of the present invention The figure which shows the structure of the main part of the refrigerator of Embodiment 1 of this invention. The figure which shows the structure of the main part of the refrigerator of Embodiment 1 of this invention. The figure which shows the structure of the main part of the refrigerator of Embodiment 1 of this invention. The figure which shows the structure of the main part of the refrigerator of Embodiment 1 of this invention. The figure which shows the structure of the main part of the refrigerator of Embodiment 1 of this invention. The figure which shows the structure of the main part of the refrigerator of Embodiment 1 of this invention. The figure which shows the change of the temperature of the refrigerator of Embodiment 1 of this invention, the amount of cold storage, and the rotation speed of a compressor. Schematic diagram of power change according to the first embodiment of the present invention The figure which shows the structure of the main part of the refrigerator of Embodiment 2 of this invention. The figure which shows the structure of the main part of the refrigerator of Embodiment 3 of this invention. The figure which shows the structure of the main part of the refrigerator of Embodiment 4 of this invention. The figure which shows the structure of the main part of the refrigerator of Embodiment 4 of this invention. Longitudinal sectional view of the refrigerator according to the fifth embodiment of the present invention. The figure which shows the refrigerating cycle of the refrigerator of Embodiment 5 of this invention.

The invention according to claim 1 includes a storage chamber cooled by the operation of a compressor , a cooler for cooling the storage chamber, and a phase-changing cold storage material, and the cooler and the cold storage material. A refrigerator having a cooling chamber and the storage chamber in front of the cooling chamber, wherein the cold storage material is in contact with or close to the cooler and is cooled by the cooler, and the cold storage material and the cooling are cooled. The storage chamber is cooled by the cooling heat of the container, the storage chamber has a return duct next to the cooler, and the cold storage material is arranged so as to cover the side portion of the cooler on the return duct side. , the lower end portion of the cold accumulating material, by arranging so as not to cover at least the bottom of the refrigerant pipe of the condenser formed in a plurality of stages refrigerant pipe meanders to ensure cooling of the time the internal cooling , Energy saving can be achieved.

The invention according to claim 2 includes a storage chamber cooled by the operation of a compressor, a cooler for cooling the storage chamber, and a phase-changing cold storage material, and the cooler and the cold storage material. A cooling chamber having a cooling chamber and a refrigerator having the storage chamber in front of the cooling chamber, wherein the cold storage material is in contact with or close to the cooler and is cooled by the cooler, and the cold storage material and the cooling are cooled. The storage chamber is cooled by the cooling heat of the vessel. The storage chamber has a return duct next to the cooler, and the cold storage material is an upper stage of the cooler in which refrigerant pipes are formed in a plurality of serpentine stages. The refrigerant pipe is arranged on the side far from the return duct in a size approximately half the size in the left-right width direction of the cooler .

The invention according to claim 3 is the invention according to claim 1 or 2 , wherein the compressor is operated at a low rotation speed to cool the cold storage material during stable operation with few door opening / closing, and the door opening / closing is frequent. During the cold operation, the compressor is operated at a low rotation speed or a medium rotation speed to cool the storage chamber with the latent heat of the cold storage material , and the energy saving efficiency can be improved .

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein a defrost heater is provided in the lower part of the cooler, and the cold storage material is arranged above the defrost heater. This makes it possible to ensure the reliability of the cold storage material and prevent the formation of ice angles between the cold storage material and the cooler.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment.

(Embodiment 1)
1 is a front view of the refrigerator according to the first embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIGS. 3a to 3f are enlarged views of a main part of the refrigerator according to the first embodiment, and FIG. Is a control block diagram of the refrigerator in the same embodiment, and FIG. 5 is a control flowchart of the quenching operation from the input load detection of the refrigerator in the same embodiment.

In FIGS. 1 and 2, the refrigerator 101 includes storage chambers divided into five upper, middle, and lower stages. Specifically, the upper storage chamber is a refrigerating chamber 102, which has a first freezing chamber 103 having a double door on the front and a drawer door below, and an ice making chamber 105 having a drawer door in parallel with the first freezing chamber 103. It is composed of a vegetable compartment 106 having a drawer door arranged at the bottom and a second freezing chamber 104 arranged between the ice making chamber 105 and the vegetable compartment 106.

Each door is illustrated as a refrigerating room door 102a, a first freezing room door 103a, a second freezing room door 104a, an ice making room door 105a, and a vegetable room door 106a, respectively. The refrigerating chamber 102, the side-by-side ice making chamber 105, and the first freezing chamber 103 are vertically partitioned by a heat insulating partition wall 111. Further, the side-by-side ice making chamber 105, the first freezing chamber 103 and the second freezing chamber 104, and the second freezing chamber 104 and the vegetable compartment 106 are also vertically partitioned by the heat insulating partition wall 111.

Further, the refrigerator 101 formed by the heat insulating wall 110 filled between the outer box 108 and the inner box 109 forms a transformation greenhouse 107 as an independent storage chamber in the lower part of the refrigerating chamber 102 provided in the upper part. ing. The transformation chamber 107 is configured as a switching chamber, and in the case of the present embodiment, the first temperature zone (chilled) of the refrigerating temperature zone around 0 ° C., the first temperature zone, and the freezing temperature of about -6 ° C. or lower. It can be set to a second temperature zone (partial) of about -3 ° C, which is the temperature zone between the band and the band.

Next, the configuration of the cooling system will be described. A cooling chamber 114 is formed behind the back surface of the second freezing chamber 104, has a cooler 115 inside, and a defrost heater 122 is arranged below the cooler 115. Together with the compressor 112 installed in the upper machine room 113, it constitutes a refrigeration cycle for cooling the refrigerator 101. Further, in the cooling chamber 114, a blower fan 116 for forcibly circulating the cold air heat exchanged by the cooler 115 is arranged, and above the blower fan 116, a damper device 117a for distributing the cold air flowing into the refrigerating chamber 102, and a greenhouse 107. A damper device 117b for distributing the cold air flowing into the room is arranged.

Further, the cooling chamber 114 is partitioned back and forth by the first freezing chamber 103, the second freezing chamber 104, and the partition wall 123 arranged in the front.

In each storage room, the temperature inside the refrigerator room 102 is about 2 to 3 ° C., the temperature inside the vegetable room 106 is about 2 to 5 ° C., and the first freezing room 103 and the second freezing room 104 The temperature inside the refrigerator can be divided into temperature zones of about -18 to -20 ° C. As a result, higher freshness and long-term storage can be realized by selecting a temperature range suitable for food storage and storing the food.

In FIGS. 1 and 2, the refrigerator 101 includes storage chambers divided into five upper, middle, and lower stages. Specifically, the upper storage chamber is a refrigerating chamber 102, which has a first freezing chamber 103 having a double door on the front and a drawer door below, and an ice making chamber 105 having a drawer door in parallel with the first freezing chamber 103. It is composed of a vegetable compartment 106 having a drawer door arranged at the bottom and a second freezing chamber 104 arranged between the ice making chamber 105 and the vegetable compartment 106.

Each door is illustrated as a refrigerating room door 102a, a first freezing room door 103a, a second freezing room door 104a, an ice making room door 105a, and a vegetable room door 106a, respectively. The refrigerating chamber 102, the side-by-side ice making chamber 105, and the first freezing chamber 103 are vertically partitioned by a heat insulating partition wall 111. Further, the side-by-side ice making chamber 105, the first freezing chamber 103 and the second freezing chamber 104, and the second freezing chamber 104 and the vegetable compartment 106 are also vertically partitioned by the heat insulating partition wall 111.

Further, the refrigerator 101 formed by the heat insulating wall 110 filled between the outer box 108 and the inner box 109 forms a transformation greenhouse 107 as an independent storage chamber in the lower part of the refrigerating chamber 102 provided in the upper part. ing. The transformation chamber 107 is configured as a switching chamber, and in the case of the present embodiment, the first temperature zone (chilled) of the refrigerating temperature zone around 0 ° C., the first temperature zone, and the freezing temperature of about -6 ° C. or lower. It can be set to a second temperature zone (partial) of about -3 ° C, which is the temperature zone between the band and the band.

Next, the configuration of the cooling system will be described. A cooling chamber 114 is formed behind the back surface of the second freezing chamber 104, has a cooler 115 inside, and constitutes a freezing cycle for cooling the refrigerator 101 together with a compressor 112 installed in the upper machine chamber 113. To do. Further, in the cooling chamber 114, a blower fan 116 for forcibly circulating the cold air heat exchanged by the cooler 115 is arranged, and above the blower fan 116, a damper device 117a for distributing the cold air flowing into the refrigerating chamber 102, and a greenhouse 107. A damper device 117b for distributing the cold air flowing into the room is arranged. In each storage room, the temperature inside the refrigerator room 102 is about 2 to 3 ° C., the temperature inside the vegetable room 106 is about 2 to 5 ° C., and the first freezing room 103 and the second freezing room 104 The temperature inside the refrigerator can be divided into temperature zones of about -18 to -20 ° C. As a result, higher freshness and long-term storage can be realized by selecting a temperature range suitable for food storage and storing the food.

Further, as shown in FIGS. 3a to 3f, the cooler 115 in the cooling chamber 114 has a plurality of fins 124 and end plates 125 provided at both ends of which the refrigerant pipes 126 are penetrated into a plurality of stages in a meandering manner. It is formed.

In the cooling chamber 114, the front portion of the cooler 115 is composed of a partition wall 123, and the partition wall 123 is heat-insulated in the lateral direction of the cooler 115. Next to the cooling chamber 114, a return duct 102b communicating with the return air passage of the refrigerating chamber 102 is formed.

The cooling chamber 114 and the refrigerating chamber return duct 102b are arranged side by side by blocking the front of the cooler 115 with the partition wall 123.

The cold storage material 127 is composed of a resin case, and is arranged in a space between the side walls of the cooler 115 and both side walls of the cooling chamber 114. More specifically, a partition 114a for partitioning the cooler 115 and the refrigerator return duct 102b is formed, and a cold storage material 127 on one side is arranged between the partition 114a and the cooler 115, and the like. The cold storage material 127 on the side is arranged between the cooler 115, the stepped portion 114b constituting the cooling chamber 114, and the cooler 115.

The cold storage material 127 is formed with a recess 127a that covers the U-shaped bending pipe 126a that is a part of the refrigerant pipe 126, and the locking means formed in the outer shell of the cold storage material 127 is locked to the U-shaped bending pipe 126a. It is fixed.

Further, the cold storage material 127 is arranged above the defrost heater 122 arranged below the cooler 115. Then, the storage chamber is cooled by the latent heat or sensible heat of the cold storage material 127 and the cold heat of the cooler 115.

Further, as shown in FIG. 3d, a U-shaped bending pipe 126a is inserted in the recess 127a of the cold storage material, and a recess 127a is independently formed for each U-shaped bending pipe 126a, and the U-shaped bending is performed. Since the pipes 126a are individually covered, the cold heat of the cooler 115 can be easily stored in the cold storage material 127. Further, a gap is formed between the recess 127a and the U-shaped bending pipe 126a so that they do not come into contact with each other.

Further, as shown in FIG. 3e, the recesses 127b of the cold storage material 127 into which the U-shaped bending pipes 126a formed at both ends of the cooler 115 are inserted are independent for each U-shaped bending pipe 126a arranged in a plurality of stages in the vertical direction. In the recess 127b, a communication groove 127c that communicates from the upper U-shaped bending pipe to the lower U-shaped bending pipe may be formed in the recess 127b.

The operation of the cold storage material 127 configured as described above will be described.

As shown in FIG. 4, during stable operation such as at night when the door opening and closing is small and the load is small, the compressor 112 is operated at a low rotation speed while repeating ON / OFF operation to bring each storage chamber to the set temperature. It's cooling. At this time, the temperature of the cooler 115 is about −26 ° C., and the cold storage material 127 is also cooled to almost the same temperature. The melting temperature of the cold storage material 127 is −22 ° C.

Then, during the cooling operation in which the opening and closing of the door increases and the load is taken in and out more, the cooling operation is performed by the latent heat of the cold storage material 127 and the cold heat of the cooler as shown in FIG. By utilizing the latent heat of the cold storage material 127, the rotation speed of the compressor 112 is controlled by low to medium rotation operation. As a result, the high-speed operation of the compressor 112 during the time of increasing power is suppressed, so that the electricity bill can be reduced.

Further, since the temperature rise of the cooler 115 due to the load fluctuation can be reduced, the temperature fluctuation loss can be reduced. Then, after the cold storage material 127 is allowed to cool while maintaining the melting temperature, the temperature of the cold storage material 127 rises, but since the cold storage material 127 is installed close to the cooler 115, the cooler 115 to the cold storage material 127 The cold storage is performed at the medium rotation speed of the compressor 112. The cold storage operation is performed while suppressing the rotation speed of the compressor 112, and energy efficiency can be improved.

Then, the cold storage operation is performed while maintaining the medium rotation speed of the compressor 112, and if the cold storage material 127 is cooled to a temperature substantially equal to the temperature of the cooler 115, the compressor 112 is operated at a low rotation speed. When the cooling operation is integrated for a predetermined time, the defrosting operation of the cooler 115 is started. At this time, the heat of the defrost heater 122 starts defrosting the cooler 115. The defrosting water of the U-shaped bending pipe 126a melts in the recess 127a and is drained to the dew tray 129.

Further, by forming the cold storage material 127 as shown in FIG. 3e, the defrost water is guided to the lower part of the cold storage material 127 through the communication groove 127c without accumulating in the recess 127b, and is below the defrost heater 122 from the opening portion 127d. Drainage to the arranged dew tray 129 can be improved. Therefore, a puddle remains between the cold storage material 127 and the cooler 115 when the frost is thawed, and it is possible to prevent the ice angle from developing due to freezing again by the cooling operation. As a result, abnormal frost formation of the cooler 115 can be prevented.

Further, as shown in FIG. 3f, recesses 127e may be formed in the cold storage material 127 so that the U-shaped bending pipes 126a arranged at the left and right ends of the cooler 115 are entirely covered in each column. As a result, the drainage of the defrost water generated between the cooler 115 and the cold storage material 127 can be further improved, and the frost residue can be reduced.

Further, during stable operation at night, the compressor 112 is operated at a low speed, the damper device 117a of the refrigerating chamber 102 and the damper device 117b of the changing greenhouse 107 are closed, and the freezing chambers 103 and 104 are cooled in a circulating mode to store cold. The material 127 may be efficiently cooled below the melting temperature (-22 ° C.).

In addition, during stable operation at night, the set temperature of the freezer chamber is lowered by 2 to 3 ° C to cool operation compared to during cold release operation where many doors open and close, and the cold storage material 127 is stored below the melting temperature, and many doors open and close. The compressor operating rate during cold operation may be lowered.

Further, although the cold storage material 127 and the cooler 115 are arranged close to each other, they may be partially brought into contact with each other. By bringing them into contact with each other, the cold heat of the cooler 115 can be easily transferred to the cold storage material 127, so that the heat storage time can be shortened.

Further, the cold storage material 127 may be formed of a metal case, and the cold heat of the cooler 115 can be efficiently transferred to the cold storage material.

Further, although the cold storage material 127 is arranged on both sides of the cooler 115, it may be arranged on at least one side, and in that case, it may be arranged on the side of the cooler 115 close to the refrigerating chamber return duct 102b. Since the air volume of the refrigerating chamber return duct 102b is large, the humidity contained in the return cold air tends to frost on the side of the cooler 115 near the refrigerating chamber return duct 102b, which may lead to deterioration of heat exchange performance. Cooling performance can be ensured by installing 127.

Further, if there is a freezer discharge damper (not shown) for adjusting the amount of cold air to the freezer chambers 103 and 104 and the ice making chamber 105, the operation of the compressor 112 is stopped when the freezer chambers 103 and 104 have reached an appropriate temperature. Then, the freezer discharge damper is closed, the fan 116 is operated to open and close the refrigerating room damper 117a or the changing room damper 117b, and the refrigerating room 102 and the changing room are used by the latent heat or sensible heat of the cooler 115 and the cold storage material 127. Since the cooling operation of 107 is performed, the power consumption can be reduced.

(Embodiment 2)
FIG. 6 is a diagram showing the configuration of the cold storage material according to the second embodiment. The overall configuration of the refrigerator is the same as in FIGS. 1 and 2.

As shown in FIG. 6, the cold storage material 130 is arranged above the cooler 115. Specifically, a recess is configured so as to cover the refrigerant pipe 126 in the upper stage of the cooler 115 from above. A refrigerating chamber return duct is formed on the right side of the cooler 115 when viewed from the front, and the cold storage material 130 is on the left side of the central portion in the left-right width direction of the cooler 115, that is, on the side closer to the refrigerating chamber return duct. Instead, it is located on the opposite side, closer to one side, above the cooler 115. Below the cooler 115 on the side where the cold storage material 130 is arranged, there is a cold air return port (not shown) that circulates in the vegetable compartment 106.

Further, although the refrigerant pipe 126 is configured with a plurality of fins 124, the refrigerant pipe 126 corresponding to the location where the cold storage material 130 is arranged has no fins, and the cold storage material 130 is located in the left-right width direction from the end plate 125 to the cooler 115. It is arranged substantially horizontally toward the center of the fan 116 so as not to exceed the projected position of the fan 116, and the locking means formed in the outer shell of the cold storage material 130 is locked and fixed to the refrigerant pipe 126. ing.

Further, the outer shell of the cold storage material 130 is formed so as to match the outer dimensions of the portion where the fins 124 are arranged. Therefore, it is possible to prevent the partition wall 123 forming the front portion of the cooler 115 from protruding forward more than necessary, and it is possible to maintain the storage room space.

The operation of the cold storage material 130 configured as described above will be described.

The cold storage material 130 arranged close to the refrigerant pipe 126 of the cooler 115 is stored cold by the cold heat of the cooler 115, and the temperature rise in the refrigerator is reduced by the operations of FIGS. 4 and 5 described above, and the rotation speed of the compressor 112 is increased. It is possible to reduce the daytime power consumption by suppressing the above.

Further, in the upper stage of the cooler 115, the cold storage material 130 is arranged not on the side close to the refrigerating chamber return duct 102b having a large air volume but on the side of the return port of the vegetable chamber having a small air volume located on the far side. The cooling performance can be maintained by the cold storage material 130 and the cooler 115 without hindering the heat exchange of the return cold air containing a large amount of moisture returning from the refrigerating chamber.

(Embodiment 3)
FIG. 7 is a diagram showing the configuration of the cold storage material according to the third embodiment. The overall configuration of the refrigerator is shown in Figures 1 and 2.
Is similar to.

As shown in FIG. 7, the cold storage material 131 is embedded in the refrigerating chamber return duct 102b formed on the side of the cooler 115 of the cooling chamber 114. The refrigerating chamber return duct 102b is formed of a heat insulating material, and the cold storage material 131 is arranged on the inner box 109 surface constituting the refrigerating chamber return duct 102b communicating with the return air passage of the refrigerating chamber 102. Further, the cold storage material 131 has a height substantially equal to the height of the cooler 115 and is formed in a flat plate shape, and is an arrangement portion of an inner box 109 that constitutes a duct surface so as not to have a step with the refrigerating chamber return duct 102b. A stepped portion is formed in the area and is buried. Further, the cold storage material 131 is stored cold by the operations of FIGS. 4 and 5 described above.

The operation of the cold storage material 131 configured as described above will be described.

The cold air heat exchanged by the cooler 115 is forcibly ventilated to each storage chamber by the fan 116, and the cold air discharged to the refrigerating chamber 102 circulates in the refrigerating chamber 102 and reaches the return port (not shown) of the refrigerating chamber 102. It is sucked in and passes through a refrigerating chamber return duct 102b formed on the back surface of the freezing chamber 104. The temperature of the return cold air is about 5 to 6 ° C, and the cold storage material 131 is partitioned to the left and right by the nearby cooler 115 and the heat insulating wall, but it communicates with the refrigerating chamber return duct 102b and stores cold at about -15 ° C. Has been done. Latent heat may be used by using a cold storage material having a melting temperature of about −10 ° C., but the sensible heat of the cold storage material 131 can be used to cool the cold air returned to the refrigerator compartment.

Therefore, when the cold air passes through the refrigerating chamber return duct 102b, it passes through the buried cold storage material 131, so that the heat is exchanged by the cold storage material 131 before returning to the cooler 115 and exchanging heat. The cold storage material 131 can absorb the moisture contained in the returned cold air, and can reduce frost formation on the cooler 115 when heat is exchanged with the cooler 115.

Further, since the temperature of the return cold air that exchanges heat with the cooler 115 can be cooled by the cold storage material 131, the load amount on the cooler 115 can be reduced and the energy saving performance can be improved.

Further, since the refrigerating chamber return duct 102b is arranged on the side of the cooler 115 and the defrost heater 122 is arranged below the cooler 115, the frosted cold storage material 131 is arranged when the cooler 115 is defrosted. Defrosting can also be performed at the same time, and it is possible to prevent the duct clogging of the refrigerating chamber return duct 102b due to excessive frost formation.

Although the flat plate-shaped cold storage material 131 is used, the cold storage material 131 may be embedded in the entire duct surface in a substantially square shape in order to promote heat exchange with the return cold air.

(Embodiment 4)
8a and 8b are diagrams showing the configuration of the cold storage material according to the fourth embodiment. The overall configuration of the refrigerator is the same as in FIGS. 1 and 2.

As shown in FIGS. 8a and 8b, the cold storage material 132 is arranged in the refrigerating chamber discharge duct 120. On the back surface of the refrigerating chamber 102, there are a duct cover 120a and an inner box 109 constituting the refrigerating chamber discharge duct 120, and a refrigerating chamber discharge duct 120 which is surrounded by the duct cover 120a and the inner box 109 and serves as an air passage is formed. There is. A recess 109a is formed on the surface (duct side) of the inner box 109, and the flat plate-shaped cold storage material 132 is embedded in the recess 109a so that the duct surface does not protrude and is arranged so as to reduce air passage resistance. ing. Further, a cold air discharge port (not shown) to the greenhouse 107 is configured in the refrigerating chamber duct cover 120a at the lower part of the refrigerating chamber 102. The cold storage material 132 is arranged on the back surface of the refrigerating chamber 102 upward from a position at least overlapping the discharge port of the greenhouse 107 in terms of projection plane.

The operation of the cold storage material 132 configured as described above will be described.

The cold air (about -15 ° C.) forcibly ventilated from the cooling chamber 114 by the fan 116 passes through the refrigerating chamber discharge duct 120, and the cold storage material 132 is cooled by the cold air of the cooler 115 by the operations of FIGS. 4 and 5 described above. It is possible to cool 132, which is cooled to about −10 ° C. Then, together with the cold air released from the cold storage material 132, the cold air of about 2 ° C. is discharged to the refrigerating chamber 102. In particular, when the compressor 112 is stopped, the fan 116 is operated to close the freezing chamber discharge damper (not shown) to cool the refrigerating chamber 102, the cooling heat of the cooler 115 and the cold storage material formed on the back surface of the refrigerating chamber 102. Since it can be cooled by 132, the power consumption can be reduced.

Further, since the cold storage material 132 is extended and arranged on the back surface of the cold air discharge port 107a of the greenhouse 107, the cold air from the cold storage material 132 can cool the greenhouse 107 to an appropriate temperature even when the compressor 112 is stopped. Can be done.

Further, since the cold storage material 132 is arranged on the surface of the inner box 109, the temperature difference with the outside air is reduced by repeating heat absorption and heat dissipation to the refrigerating chamber discharge duct 120, which acts as a heat insulating material and the amount of heat absorption of the main body. Can be reduced.

(Embodiment 5)
FIG. 9 is a diagram showing the configuration of the cold storage material according to the fifth embodiment. A cooling chamber 133 is formed behind the freezing chambers 103 and 104, and a cold storage chamber 135 is formed behind the cooling chamber 133 with the heat insulating wall 110 on the back surface. A cooler 115 and a first fan 134 forcibly ventilating above the cooler 115 are provided in the cooling chamber 133, and a refrigerant pipe is wound around the cold storage material 136 and the cold storage material 136 in the cold storage chamber 135. A second cooler 137 for cold storage is configured, and a second fan 138 for forcibly ventilating the stored cold heat is arranged above the cold storage material 136.

The cooling chamber 133 and the cold storage chamber 135 are arranged in the front-rear direction, but the first fan 134 and the second fan 138 are arranged in the left-right direction (not shown). Further, the return duct of each storage chamber communicates with the cooling chamber 133 and the cold storage chamber 135, and heat is exchanged by the cooler 115 and the second cooler 137 for cold storage. Further, as shown in FIG. 10, the cooler 115 and the second cooler 137 for cold storage are arranged in parallel, and the refrigerant flow path can be switched by the switching valve 139.

When the load amount is small, such as at night when the door is not opened and closed, the compressor 112 is operated at a low speed while the refrigerant is circulated through the cooler 115 to cool each storage room, and when each room reaches an appropriate temperature, the switching valve 139 is turned on. By switching, the refrigerant is circulated through the second cooler 137 for cold storage to store heat while the second fan is stopped. When the refrigerating chamber temperature exceeds the upper limit temperature, the freezing chamber damper (not shown) is closed and the first fan 134 is operated for cooling. When the freezing chamber temperature exceeds the upper limit temperature, the switching valve 139 is switched so that the refrigerant circulates in the cooler 115 to cool the freezing chambers 103 and 104. In this way, at night when the load is small, the cold storage material 136 is stored cold and cooled so as to be below the freezing point temperature (-22 ° C.) or at the ambient temperature thereof.

Then, when the load amount with a large opening and closing of the door becomes large, the compressor 112 is stopped and the cold storage chamber 135 to the second fan 138 are operated to move the refrigerator compartment 102, the changing greenhouse 107, the vegetable compartment 106, and the freezing chambers 103 and 104. If it is cooled or the freezing chambers 103 and 104 are at appropriate temperatures, the freezing chamber damper (not shown) provided in the cold storage chamber is closed to cool the refrigerating chamber 102, the changing greenhouse 107, and the vegetable compartment 106. In this way, the compressor 112 is stopped at the peak of electric power in the daytime to cool the cold storage material 136, so that the electricity bill can be reduced.

Further, the compressor 112 does not operate at a high rotation speed, but the power consumption can be reduced by circulating the refrigerant in the cold storage chamber 135 while operating at a medium rotation speed and cooling by releasing the cold storage material.

Further, the cold storage material temperature detecting means (not shown) may be used to switch to an operation in which the refrigerant is circulated in the cooler 115 and each storage room is cooled by the cooling chamber 133 when the cold storage material temperature is higher than a predetermined temperature.

Further, although the cooling chamber 133 is arranged in the front and the cold storage chamber 135 is arranged in the rear, the cold storage chamber 135 may be arranged in the front, or the first fan 134 and the second fan 138 may be arranged in the front and rear. By making the inclination of the rotation axis of the fan in the chamber arranged in the foreground larger than the inclination of the rotation axis of the fan in the chamber arranged in the rear, the air volume to the upper storage chamber can be secured.

Further, since the cooling chamber 133 and the cold storage chamber 135 are insulated to form an independent air passage, it is possible to suppress the temperature rise of the cold storage chamber 135 due to the defrost heater at the time of defrosting the cooling chamber 133.

As described above, the refrigerator according to the present invention can reduce the power consumption during the daytime during actual use or when the load due to opening and closing the door is large, and thus is applicable to all cooling devices such as commercial refrigerators. it can.

101 Refrigerator 102b Return duct 109a, 127a, 127b, 127e Recess 114, 133 Cooling room 115 Cooler 120 Refrigerating room Discharge duct 125 End plate 126 Refrigerant pipe 126a U-shaped bending pipe 127, 130, 131, 132, 136 Cold storage material 137 2nd cooler 139 Switching valve 140 1st cooler

Claims (4)

A cooling chamber having a storage chamber cooled by the operation of a compressor, a cooler for cooling the storage chamber , and a phase-changing cold storage material , and having the cooler and the cold storage material, and the cooling chamber. A refrigerator having the storage chamber in front of the refrigerator, the cold storage material is placed in contact with or close to the cooler, cooled by the cooler, and the storage chamber is cooled by the cold heat of the cold storage material and the cooler. A return duct of the storage chamber is provided next to the cooler, the cold storage material is arranged so as to cover the side portion of the cooler on the return duct side, and a lower end portion of the cold storage material is arranged. A refrigerator characterized in that the refrigerant pipes are arranged in a serpentine manner in a plurality of stages so as not to cover at least the lowest stage refrigerant pipe of the cooler . A cooling chamber having a storage chamber cooled by the operation of a compressor, a cooler for cooling the storage chamber, and a phase-changing cold storage material, and having the cooler and the cold storage material, and the cooling chamber. A refrigerator having the storage chamber in front of the refrigerator, the cold storage material is placed in contact with or close to the cooler, cooled by the cooler, and the storage chamber is cooled by the cold heat of the cold storage material and the cooler. The refrigerator is provided with a return duct of the storage chamber next to the cooler, and the cold storage material is attached to the refrigerant pipe in the upper stage of the cooler in which the refrigerant pipes are formed in a plurality of serpentine stages. A refrigerator characterized in that it is approximately half the size in the left-right width direction and is arranged on the side far from the return duct . During stable operation with little door opening / closing, the compressor is operated at low rotation to cool the cold storage material, and during cold release operation with many door opening / closing, the compressor is operated at low or medium rotation to cool the cold storage material. The refrigerator according to claim 1 or 2, wherein the storage chamber is cooled by the latent heat of the above . The refrigerator according to any one of claims 1 to 3, wherein a defrost heater is provided in the lower part of the cooler, and the cold storage material is arranged above the defrost heater.

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