JP6405525B2 - refrigerator - Google Patents

Description

  The present invention relates to the structure of a refrigerator return air passage for a refrigerator.

  Conventionally, the cool air discharged from the cooler to the refrigerating room is one in which the cool air is discharged from the upper part of the refrigerating room duct arranged on the back of the refrigerating room and returned to the cooler from the suction port provided at one of the lower parts of the refrigerating room duct. is there. (For example, refer to Patent Document 1).

Japanese Patent Laid-Open No. 10-288444

  However, in the said conventional structure, since the inlet provided in one side of the lower part of a refrigerator compartment duct entered directly into a user's eyes, it had the subject that it was inferior to designability.

  This invention solves the conventional subject, and it aims at providing the refrigerator which can improve designability, maintaining the cooling performance of a refrigerator compartment.

In order to solve the above conventional problems, the refrigerator of the present invention, there is provided a refrigerator comprising a refrigerating compartment, and a cooling chamber for accommodating the cooler for generating cool air, different from the refrigerating compartment at the bottom of the cooling chamber A storage case of a temperature zone is provided, and both a first suction inlet portion that returns cold air from the refrigerator compartment to the cooling chamber and a second suction inlet portion that returns cold air from the storage case to the cooling chamber, It is arranged on the back of the storage case.

  The present invention can provide a refrigerator that can enhance the design of the refrigerator compartment while maintaining the cooling performance of the refrigerator compartment.

The longitudinal cross-sectional view of the refrigerator in Embodiment 1 of this invention Vertical sectional view of the cooling chamber of the refrigerator in Embodiment 1 of the present invention Front air path diagram of cooling room of refrigerator in embodiment 1 of the present invention Detailed longitudinal cross-sectional view of the cooling chamber of the refrigerator in Embodiment 1 of the present invention Schematic longitudinal cross-sectional view of the refrigerator in Embodiment 2 of this invention Schematic longitudinal cross-sectional view of the refrigerator in Embodiment 2 of this invention The front view of the refrigerator compartment duct arrange | positioned in the refrigerator compartment back surface of the refrigerator in Embodiment 2 of this invention The schematic perspective view which shows the cold air discharge air path to the switching room of the refrigerator in Embodiment 2 of this invention Schematic sectional view showing the switching chamber and the cold air discharge air passage of the refrigerator in the second embodiment of the present invention The exploded block diagram of the heat insulation partition wall of the switching room and freezer compartment of the refrigerator in Embodiment 2 of this invention Sectional schematic drawing which shows the cold air suction air path around the cooler of the refrigerator in Embodiment 2 of the present invention Schematic front view showing a cold air suction air passage around the refrigerator cooler in Embodiment 2 of the present invention. Schematic front view showing the cooler of the refrigerator and the cold air suction air passage from the refrigerator compartment in Embodiment 2 of the present invention Side surface schematic diagram which shows the cooler of the refrigerator in Embodiment 2 of this invention, and the cool air suction air path from a refrigerator compartment

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same reference numerals are given to the same configurations as those of the conventional example or the embodiments described above, and detailed descriptions thereof will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is a longitudinal sectional view of a refrigerator according to Embodiment 1 of the present invention, FIG. 2 is a longitudinal sectional view of a cooling chamber according to Embodiment 1 of the present invention, and FIG. 3 is a perspective view of the refrigerator according to Embodiment 1 of the present invention. FIG. 4 is a detailed longitudinal sectional view of the cooling chamber of the refrigerator according to Embodiment 1 of the present invention.

1 to 4, a heat insulating box 31 of a refrigerator 30 is mainly composed of an outer box 32 using a steel plate and an inner box 33 formed of a resin such as ABS. A foam insulation material 34 such as urethane foam is filled and insulated from the surroundings, and is divided into a plurality of storage rooms.

  The plurality of storage rooms of the refrigerator 30 has a refrigerating room 35 at the top, a switching room 36 at the bottom, and a freezing room 37 between the refrigerating room 35 and the switching room 36.

  A refrigerator door 35A is opened at the front opening of the refrigerator compartment 35, a switching chamber door 36A is opened at the front opening of the switching chamber 36, and a freezer compartment door 37A is opened and closed at the front opening of the freezing compartment 37. It is supported freely.

  The refrigerator compartment 35 is normally set to 1 to 5 ° C. at the lower limit of the temperature at which it does not freeze for refrigerated storage, and the freezer compartment 37 is set to a freezing temperature zone, and is usually −22 ° C. to −15 ° C. for frozen storage. Although it is set, it may be set at a low temperature such as −30 ° C. or −25 ° C. in order to improve the frozen storage state. Moreover, the switching chamber 36 can be set to -18-8 degreeC. The temperature switching of the switching chamber 36 is not limited to the above, and the temperature fluctuation range such as −3 to 4 ° C. can be appropriately set depending on the application.

  Further, the switching chamber 36 and the freezer compartment 37 are vertically partitioned by a first partition wall 71 that is a partition wall, and the refrigerator compartment 35 and the freezer compartment 37 are vertically partitioned by a second partition wall 72 that is a partition wall. Yes.

  Next, the configuration of the cooling chamber will be described.

  The cooling chamber 43 is insulated from the freezing chamber 37 by a vertical partition wall 45. A cooling chamber 43 for generating cold air is provided on the back of the freezer chamber 37, and a fin and tube type cold air is generated inside as a representative, and a cooler 44 using aluminum or copper as a material is provided. It is arranged.

  The cooler 44 includes a refrigerant tube 201 in which a refrigerant flows and a plurality of plate fins 202 arranged at predetermined intervals.

  The refrigerant tube 201 is a single tube made of aluminum or aluminum alloy, and the straight pipe portion and the curved pipe portion are continuous, and meandering in a row (left / right) direction X and a step (up / down) direction Y. It is a serpentine tube bent into a shape, and forms a single refrigerant flow path without using a connecting pipe that forms a curved pipe portion. And the straight pipe part of the refrigerant | coolant tube 201 becomes the structure closely_contact | adhered to the plate fin 202, when the curved pipe part of the refrigerant | coolant tube 201 penetrates the long hole 203 formed in the plate fin 202. FIG.

  The long hole 203 has a rectangular portion and a circular arc portion, and is formed in a long hole shape in which the circular arc portions are continuously formed on both short sides of the rectangular portion. Further, the arc part is provided with an edge-shaped arc part collar for tightly fixing with the straight pipe part of the refrigerant tube 201, and the edge part is also formed substantially vertically at both ends in the longitudinal direction of the rectangular part. A rectangular color is provided. The rectangular portion collar is provided with a cooler 44 so as to incline downward toward the back of the refrigerator.

  A blower 46 that forcibly blows the generated cold air is disposed above the cooler 44, and a defrost heater 47 that defrosts frost and ice adhering to the cooler 44 is disposed below the cooler 44. Is provided. Furthermore, a drain pan 48 for receiving defrosted water generated at the time of defrosting, a drain tube 49 penetrating from the deepest part to the outside of the cabinet are configured at the lower part, and an evaporating dish 50 is configured outside the warehouse on the downstream side. .

The defrost heater 47 is specifically a glass tube heater 59 made of glass, and in particular, when the refrigerant is a hydrocarbon-based refrigerant gas, a double glass tube heater in which glass tubes are formed in a double manner for explosion protection is used. It has been adopted. A heater cover 60 that covers the glass tube heater 59 is disposed above the glass tube heater 59, and water drops dripped from the cooler 44 during defrosting directly fall on the surface of the glass tube that has become hot due to defrosting. The size is equal to or greater than the glass tube diameter and width so that no sound is generated.

  Here, isobutane, which is a flammable refrigerant having a low global warming potential, is used as a refrigerant in recent refrigeration cycles from the viewpoint of global environmental conservation. This hydrocarbon, isobutane, has a specific gravity of about twice that at normal temperature and atmospheric pressure (at 2.04 and 300K) compared to air. As a result, the refrigerant charge amount can be reduced as compared with the conventional case, the cost is low, and the leakage amount when the flammable refrigerant leaks is reduced, thereby improving the safety.

  In the present embodiment, isobutane is used as the refrigerant, and the maximum temperature on the surface of the glass tube, which is the outline of the glass tube heater 59 at the time of defrosting, is regulated as an explosion-proof measure. Therefore, in order to reduce the temperature of the glass tube surface, a double glass tube heater in which the glass tube is formed in a double manner is employed. In addition, as a means for reducing the temperature on the surface of the glass tube, a member (for example, an aluminum fin) having high heat dissipation can be wound around the surface of the glass tube. At this time, the outer dimensions of the glass tube heater 59 can be reduced by using a single glass tube.

  In addition to the glass tube heater 59, a pipe heater that is in close contact with the cooler 44 may be used as a means for improving the efficiency during defrosting. In this case, the defrosting of the cooler 44 is efficiently performed by direct heat transfer from the pipe heater, and the frost adhering to the drain pan 48 and the blower 46 around the cooler 44 can be melted by the glass tube heater 59. Therefore, the defrosting time can be shortened, and an increase in the internal temperature during energy saving and defrosting time can be suppressed.

  When the glass tube heater 59 and the pipe heater are combined, the capacity of the glass tube heater 59 can be reduced by optimizing the heater capacities of each other. If the heater capacity is lowered, the outer temperature of the glass tube heater 59 at the time of defrosting can also be lowered, so that red heat at the time of defrosting can also be suppressed.

  The drain pan 48 constitutes a part of the bottom surface and the back surface of the cooling chamber 43. The bottom surface is configured such that the connection portion with the drain tube 49 is the lowest in order to collect the defrost water in the drain tube 49, and is farthest from the defrost heater 47 at the connection portion with the drain tube 49 (distance L). It will be. The back surface rises to a height that exceeds the height at which the amount of water stored in the drain pan 48 can be secured, and the angle formed between the bottom surface and the back surface is a gently curved surface.

  Next, the air path configuration will be described.

  The vertical partition wall 45 includes a front partition wall 45 </ b> A that forms the outer shell of the freezing chamber 37 and a rear partition wall 45 </ b> B that forms the outer shell of the cooling chamber 43. A space between the front partition wall 45 </ b> A and the rear partition wall 45 </ b> B is a distribution air passage 51 that branches cold air toward each storage chamber.

  The front partition wall 45 </ b> A has a freezer compartment discharge port 52 on the upper side, and communicates the distribution air passage 51 and the freezer compartment 37. A freezer compartment suction air passage 53 projecting toward the freezer compartment 37 is provided below, and the return cold air from the freezer compartment 37 is introduced into the cooler chamber 43 through an inlet 53A provided in front of the freezer compartment intake air passage 53.

The distribution air passage 51 is connected to the switching chamber discharge air passage 86 via a switching chamber damper 80 provided in the first partition wall 71 and communicates the distribution air passage 51 and the switching chamber 36. The distribution air passage 51 and the refrigerator compartment 35 are communicated with each other through a refrigerator compartment damper 42 provided in the second partition wall 72 and connected to the refrigerator outlet air passage 85.

  The rear partition wall 45 </ b> B includes a blower 46 on the upper side, and a rib 55 that partitions the freezer compartment suction air passage 53 and the cooling chamber 43 on the lower side. A region surrounded by the rib 55 and the drain pan 48 in the freezer compartment suction air passage 53 is a freezer compartment suction port 56, and the freezer compartment suction air passage 53 and the cooling chamber 43 communicate with each other.

  The area of the freezer compartment inlet 56 is configured to be larger than the area of the inlet 53A. Further, in the longitudinal section passing through the center of the drain tube 49, the distance L between the defrost heater 47 and the drain tube 49 is configured to be larger than the height H of the freezer compartment inlet 56 in the same longitudinal section. . Further, the distance B between the back surface of the cooling chamber 43 and the defrost heater 47 is also configured to be larger than the height H of the freezer compartment suction port 56.

  The bottom surface of the freezing chamber suction air passage 53 is constituted by a part of the drain pan 48 and the bottom surface of the cooling chamber 43. The drain pan 48 starts from the lower end of the entrance 53A, passes through the upper end of the freezer compartment suction port 56, and inclines downward to the drain tube 49. Thereafter, the drain pan 48 is gently turned upward and connected to the back surface of the cooling chamber 43.

  A refrigerating room suction air passage 87 is disposed on the back surface of the cooler 44. The refrigerating room suction air passage 87 passes through the second partition wall 72 and communicates the refrigerating room 35 and the cooling room 43, and cold air that has cooled the refrigerating room 35 flows therethrough. The refrigerating room suction air passage 87 includes a refrigerating room suction port 88 communicating with the cooling room 43 below.

  In addition, on the back surface of the cooler 44, a switching room suction port 89 is also provided in parallel with the refrigerating room suction port 88. The switching chamber suction port 89 communicates with the switching chamber 36 via a switching chamber suction air passage 90 provided in the first partition wall 71.

  The refrigerating room suction air passage 87 communicating with the refrigerating room suction opening 88 and the switching room suction air passage 90 communicating with the switching room suction opening 89 are configured as independent suction air passages.

  Further, the refrigerator compartment suction port 88 and the switching chamber suction port 89 are provided in the vicinity of the lower end of the cooler 44 and are configured at a position higher than the freezer compartment suction port 56.

  The upper ends of the refrigerator compartment suction port 88 and the switching chamber suction port 89 are disposed above the lower end of the cooler 44.

  In addition, the width dimension of the plurality of high-temperature suction ports including the refrigerating chamber suction port 88 and the switching chamber suction port 89 is arranged substantially the same as the width dimension of the cooler 44.

  In addition, the opening area of the refrigerator compartment suction port 88 in a temperature range higher than that of the switching chamber is set larger than the opening area of the switching chamber suction port 89.

  Further, the switching chamber suction port 89 is disposed at a side end portion on the far side in the width direction with respect to the connection portion of the refrigeration chamber suction air passage 87 corresponding to the refrigeration chamber suction port 88 with the refrigeration chamber 35.

  The switching chamber suction port 89 and the refrigerating chamber suction port 88 provided together may be disposed side by side so as to wrap in the horizontal direction and the vertical direction.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the cooling operation will be described.

  A part of the cold air generated by the cooler 44 in the cooling chamber 43 is forcibly blown forward by the blower 46 in the distribution air passage 51. The freezer compartment 37 is cooled by the cold air discharged from the freezer compartment outlet 52, and the cold air is below the cooler 44 from the freezer compartment inlet 56 through the freezer inlet air passage 53 provided at the lower part of the vertical partition wall 45. Then, heat is exchanged in the cooler 44, and fresh cold air is circulated again by the blower 46. As a result, the freezer compartment 37 is cooled to an appropriate temperature under the control of a freezer sensor (not shown).

  The cool air discharged upward in the distribution air passage 51 is discharged into the refrigerating chamber 35 through the refrigerating chamber discharge air passage 85 in the second partition wall 72. Further, the cool air discharged into the distribution air passage 51 circulates in the first partition wall 71 and flows into the switching chamber 36 into the switching chamber 36. The cold air circulated through the refrigerating room 35 and the switching room 36 becomes air having moisture contained in air or stored items, and the refrigerating room 35 passes through the refrigerating room suction air passage 87 and is cooled from the refrigerating room suction port 88. The heat is exchanged with the cooler 44 by being guided to a lower portion of the cooler 44, and fresh cool air is forcibly blown again by the blower. Similarly, the switching chamber 36 passes through the switching chamber suction air passage 90 and is led from the switching chamber suction port 89 to the lower portion of the cooler 44 to exchange heat with the cooler 44, so that fresh cold air is forced again by the blower. Be blown.

  Thereby, even if the refrigerating room 35 and the switching room 36 are located away from the cooler 44, the room can be cooled to the set temperature by forcibly circulating the cool air by the blower 46.

  Here, since the switching chamber damper 80 for adjusting the amount of cool air is provided in the air passage of the switching chamber discharge air passage 86 for introducing the cold air into the switching chamber 36, the temperature in the switching chamber 36 is controlled by the switching chamber damper 80. Since the temperature can be controlled precisely, for example, temperature fluctuations in the warehouse can be suppressed and the interior can be maintained at an appropriate temperature even when the door is excessively opened and closed during summer or when food is stored after shopping.

  Note that. The switching chamber 36 is basically one that can be set to −18 to 8 ° C. However, the switching of the temperature zone of the switching chamber 36 is not limited to this, and is appropriately set to −3 to 4 ° C. The temperature fluctuation range can be set according to the application, and it is possible to achieve both usability and energy saving.

  Further, since the defrost heater 47 can heat the inside of the cooling chamber 43, the inside of the refrigerating room suction air passage 87, and the inside of the switching room suction air passage 90 with the heater heat at the time of defrosting, it can improve and prevent condensation and freezing. Reliability can be increased.

  Here, the details of the suction air passage configuration will be described.

  When the cool air discharged from the blower 46 circulates through all the storage rooms of the refrigerating room 35, the switching room 36, and the freezing room 37, the cooling room 43 contains the return cold air from the freezing room 37, Three flows of high-temperature return cold air from the switching chamber 36 will flow simultaneously.

  That is, the return cold air from the freezer compartment 37 passes from the entrance 53A through the freezer compartment suction air passage 53 and enters the cooling compartment 43 from the freezer compartment suction port 56, and the high temperature return cold air from the refrigerating compartment 35 becomes the refrigerating compartment suction air passage. The hot air returning from the switching chamber 36 enters the cooling chamber 43 through the switching chamber suction air passage 90 through the switching chamber suction air passage 90.

In the present embodiment, the freezer compartment suction port 56 is provided on the front surface of the cooling chamber 43, the refrigerator compartment suction port 88 is provided on the back surface of the cooling chamber 43, and the freezer compartment suction port 56 is located below the refrigerator compartment suction port 88, Since the freezer compartment suction port 56 is located below the entrance 53 </ b> A, the freezer return cold air flows downward into the cooler chamber 43 along the drain pan 48 constituting the bottom surface of the freezer compartment suction air passage 53. Above the drain pan 48, a defrost heater 47 for melting frost and ice is provided, but the distance L between the defrost heater 47 and the drain pan 48 rather than the height H of the freezer compartment inlet 56, and the cooling chamber Since the distance B from the back surface of 43 is increased, the freezing chamber return cold air easily flows under the defrosting heater 47 having a large space, and thereafter flows as it is through the bottom surface of the cooling chamber 43 according to the shape of the drain pan 48. The pressure loss can be kept small even when flowing upward in the back surface of the cooling chamber 43.

  As a result, the freezer return cold air having a large backward speed and the high temperature return cold air having a large forward speed shift in the vertical direction, so that mutual interference can be suppressed and the amount of air circulating in the warehouse can be increased. Therefore, the cooling capacity can be further improved. In addition, even when the cold air circulates only in the freezer compartment 37 that needs to be cooled most, the freezer compartment suction port 56 is further downward, so that the distance that the freezer return cold air passes through the cooler 44 is increased. By increasing the exchange amount, the cooling capacity can be further improved.

  The above-described freezing room return cold air and the high temperature return cold air coming out of the refrigerating room suction port 88 and the switching room suction port 89 installed on the back surface of the cooling chamber 43 merge on the back surface of the cooling chamber 43. Is pushed by the upward freezing room return cold air and smoothly turns upward, and can enter the cooler 44 together with the freezing room return cold air. Therefore, since the two flows of the freezer return cold air and the high temperature return cold air do not interfere with each other and interfere with each other, increasing the air volume of the two flows increases the heat exchange amount of the cooler 44 and increases the cooling capacity. It can be improved.

  The shape of the drain pan 48 constituting the bottom surface of the cooling chamber 43 has a shape inclined downward from the freezing chamber suction port 56 to the drain tube 49, so that the freezing chamber return cold air flows downward along the drain pan 48. Since it can be raised along the rear rear surface, the speed of the freezing room return cold air is directed upward in front of the high temperature suction port 58, and can smoothly merge with the high temperature return cold air, thereby increasing the air volume and improving the cooling capacity.

  The freezer compartment suction port 56 includes a freezer compartment suction air passage 53 on the upstream side, and the entrance 53A of the freezer compartment suction air passage 53 is positioned above the freezer compartment suction port 56. Since the cold air returning to the freezer compartment flows downward into the cooling chamber 43, it becomes easier to flow along the drain pan 48, and interference with the low temperature cold air can be suppressed while reducing the pressure loss. Furthermore, since the area of the inlet 53A of the freezer compartment inlet air passage 53 is smaller than the area of the freezer compartment inlet 56, pressure loss at the freezer compartment inlet 56 can be further reduced.

  In addition, a high-temperature suction port on the back side of the cooler, which is an inflow portion of the return cold air from the refrigerating chamber 35 and the switching chamber 36, is arranged substantially the same as the width dimension of the cooler. As a result, among the return cold air circulating in the refrigerator, the cooler room return cold air and the switching room return cold air having a large temperature difference with the cooler 44 can perform heat exchange with the cooler 44 with substantially the same size as the cooler width. Therefore, the heat exchange area in the cooler 44 can be increased, and energy can be saved by improving the refrigeration cycle efficiency.

Furthermore, in the use state of the refrigerator, the number of times of opening and closing the doors of the refrigerator compartment 35 and the switching chamber 36 is large. In recent years, in particular, the switching room 36 also has the actual condition of preserving and storing PET bottles other than vegetables, and the number of times the doors of the refrigerating room 35 and the switching room 36 are opened and closed within a day is increasing compared to 10 years ago. Therefore, since the amount of heat exchange between the high-temperature return cold air circulating through the high-temperature storage chambers of the refrigerating chamber 35 and the switching chamber 36 and the cooler as described above increases, the time for cooling the interior can be reduced. The amount of frost formation on the cooler 44 due to shortening of the cooling operation time can also be reduced. In particular, the high temperature storage chamber is not only easy to infiltrate the moisture of the outside air due to the large number of times of opening and closing the door, but also because the temperature is high and the absolute humidity held in the air is high, the amount of frost adhering to the cooler 44 also increases. . By reducing the amount of frost formation on the cooler 44, it is possible to extend the defrost cycle of the cooler 44, and it is necessary for reducing the number of times of input of the defrost heater 47 and cooling the interior after the internal temperature rise due to defrosting. Input can be reduced and further energy saving can be achieved.

  Further, the fact that the heat exchange area in the cooler 44 can be increased is that the area to be frosted on the cooler 44 is increased, so that deterioration of the cooling capacity during frost formation can also be suppressed. As a result, it is possible to extend the time (defrost cycle) until the defrosting is required after the refrigerator is operated, and the inside of the storage room after the number of inputs of the defrosting heater 47 is reduced and the internal temperature rises due to the defrosting. The input required for cooling can be reduced, and further energy saving can be performed.

  In addition, the refrigeration chamber suction port upper end 88 </ b> A and the switching chamber suction port upper end 89 </ b> A, which are the respective suction ports installed side by side on the rear surface of the cooling chamber 43, are located above the cooler lower end 44 </ b> B that is the lower end of the cooler 44. It is.

  Accordingly, in the cooling chamber 43, the return cold air from the refrigerating chamber 35 and the switching chamber 36 flows above the freezing chamber return cold air from the freezing chamber 37, and therefore, the freezer return cold air having a large backward speed and the forward speed. The return cold air from the refrigerating chamber 35 and the switching chamber 36 having a large displacement is shifted in the vertical direction, and can suppress the mutual interference and increase the amount of air circulating in the warehouse, thereby further improving the cooling capacity.

  In addition, frost adheres to the cooler 44 due to moisture in the air that has entered when the door is opened, moisture adhering to food put in the cabinet, moisture from vegetables stored in the cabinet, and the like. To do. When this frost grows, the heat exchange efficiency is lowered between the cooler 44 and the circulating cold air, and the inside of the cabinet cannot be cooled sufficiently, and finally becomes uncooled or slowly cooled. Therefore, in the refrigerator, it is necessary to periodically defrost frost adhering to the cooler 44. However, as in the present embodiment, the refrigeration room suction port upper end 88A, the switching room suction port upper end 89A, the refrigeration room suction port. By disposing the cooler lower end 44B between the lower end 88B and the switching chamber suction port lower end 89B, even if frost adhering to the lower part of the back of the cooler grows due to high-temperature return cold air having a large moisture content, the cooler bottom side 44B As the high temperature return cold air flows, it improves frost resistance. Therefore, the deterioration of the cooling capacity at the time of frost formation can also be suppressed.

  In addition, when the refrigerator compartment suction inlet upper end 88A and the switching chamber suction inlet upper end 89A are set below the cooler 44, the air passage resistance of the refrigerator compartment suction air passage 87 is increased and the circulating air volume is reduced, so that the cooling capacity is lowered. On the other hand, when the upper end 88A of the refrigerating chamber suction port and the upper end 89A of the switching chamber suction port are located above the cooler 44, the air path resistance decreases and the circulation air volume increases, but the return to the cooler 44 facilitates the flow of cool air and adheres. The refrigeration room suction air passage 87 may be blocked by frost. Therefore, as in the present embodiment, the cooler lower end 44B is disposed between the refrigeration chamber suction port upper end 88A and the switching chamber suction port upper end 89A, and the refrigeration chamber suction port lower end 88B and the switching chamber suction port lower end 89B. Thus, the cooling capacity and the frosting resistance are satisfied. In particular, the cooling chamber suction port upper end 88A and the switching chamber suction port upper end 89A are arranged between the lowermost pipe of the cooler 44 and the pipe one stage higher than the lowermost stage, thereby providing both cooling capacity and frosting resistance. We are trying to optimize.

  In the cooling chamber 43, the long holes 203 of the plate fins 202 and the rectangular collar 203B are installed in the cooler 44 so as to incline downward toward the back of the refrigerator. A vertically upward component mainly enters from the back side, and a part of the entering cool air flows along the plate fins 202 and the rectangular collar 203B of the cooler 44 and is guided to the front of the cooler 44. Thereby, since the amount of heat exchange can be increased by passing the cool air through the entire cooler 44, the cooling capacity can be improved.

In the present embodiment, the opening area of the refrigerator compartment suction port 88 is set larger than the opening area of the switching chamber suction port 89. The temperature of the switching chamber 36 has an optimum storage temperature depending on the vegetables to be stored, and it is preferable to store separately about 1 to 2 ° C. for leaf vegetables and about 8 to 9 ° C. for real vegetables. In addition, the temperature of the refrigerator compartment 35 is set lower than that of the switching chamber 36. Therefore, as in this embodiment, by setting the opening area of the refrigerator compartment suction port 88 larger than that of the switching chamber inlet port 89, the circulation for cooling the refrigerator compartment to a temperature lower than the switching chamber temperature. Air volume and cold air volume can be secured.

  Further, the switching chamber suction port 89 is disposed at the side end portion on the side far in the width direction with respect to the connection portion between the refrigerator compartment 35 and the refrigerator compartment suction air passage 87.

  Thereby, the return cold air of the refrigerating room corresponding to the refrigerating room 35 cooled to a temperature lower than the switching room temperature is transferred to the cooler 44 in a state where the wind speed is higher than the switching room return cold air in the refrigerating room suction air passage 87. And circulate. Furthermore, the wind speed with the shortest air path distance between the connection between the refrigerator compartment 35 and the refrigerator compartment suction air passage 87 and the cooler 44 has the fastest wind speed. In the present embodiment, since the switching chamber suction port 89 is disposed on the side of the air passage having a long air passage distance with respect to the connection portion between the refrigerating chamber 35 and the refrigerating chamber suction air passage 87, the switching chamber 36 is cooled. Since the return cold air flowing into the cooler 44 can be less affected by the circulating wind speed at which the return cold air from the refrigerator compartment flows into the cooler 44, mutual interference such as backflow can be suppressed and heat exchange efficiency can be ensured.

  Further, in the present embodiment, the switching chamber suction port 89 is disposed side by side with the refrigeration chamber suction port 88 in the horizontal direction and the vertical direction.

  As a result, the return cold air flowing into the rear surface of the cooler can be heat-exchanged over the entire width of the cooler, so that the heat exchange efficiency is increased and the refrigeration cycle efficiency is increased, thereby saving energy. Further, since the parts can be reduced in size when forming the refrigerating chamber suction air passage 87 and the switching chamber suction air passage 90, the cost can be reduced. In particular, by integrally configuring the refrigeration chamber suction air passage 87, the refrigeration chamber suction port 88, the switching chamber suction air passage 90, and the switching chamber suction port 89, it is possible to reduce the material cost and mold cost to be created, and in the manufacturing process. The number of man-hours can be reduced. In the present embodiment, the refrigeration chamber suction air passage 87, the refrigeration chamber suction port 88, and the switching chamber suction port 89 are configured as a single part, and management by reducing the number of parts in addition to the reduction of material cost and mold cost. Costs have also been reduced. As a result, the cost of the product as a whole can be reduced, leading to a reduction in the selling price, and the selling rate can be improved.

  In addition, since the switching chamber suction port 89 can arrange | position the refrigerator compartment suction port 88 in the back surface of the cooler 44, an ineffective space can be reduced, the internal volume increases and the usability can be improved.

  Note that the refrigerator 30 needs to cool the freezer compartment 37 having the largest temperature difference from the outside air temperature among the three storage rooms, so the refrigerator air discharge path 85 is closed with an open / close valve (not shown). Therefore, it is necessary to circulate cold air only in the freezer compartment 37. When the cool air discharged from the blower 46 circulates only in the freezer compartment 37, only the return cool air from the freezer compartment 37 flows into the cooler chamber 43.

  At this time, the freezing room return cold air passes through the freezing room suction air passage 53 from the entrance 53A and enters the cooling room 43 through the freezing room suction port 56 as in the case where the cold air circulates in all the storage rooms. It passes under the heater 47 and enters the cooler 44 along the drain pan 48 from the back surface. Therefore, the freezer return cold air can flow diagonally in the cooler 44, and the heat exchange distance can be increased, so that the heat exchange amount can be increased and the cooling capacity can be improved.

  Furthermore, since the suction port installed on the front surface of the cooling chamber 43 is only the freezing chamber suction port 56, the width of the freezing chamber suction port 56 can be expanded to the same as the width of the cooler 44. Therefore, even when the cold air is circulating only in the freezer compartment 37, the entire cooler 44 can be used, and the cooling capacity can be further improved.

  Moreover, since the freezer compartment suction inlet is larger than the inlet 53A of the freezer compartment suction air passage 53, the pressure loss here can also be suppressed and the air volume can be increased.

  As described above, the cooling capacity can be improved both when the entire refrigerator is cooled and when the refrigerator is mainly cooled.

  In general, since a low-temperature cooler 44 is disposed on the back of the refrigerator 30, a large amount of heat enters through the heat-insulating wall on the back, but a high-temperature suction air passage is provided between the cooling chamber 43 and the heat-insulating wall. Since it comprises, the calorie | heat amount which penetrate | invades through the heat insulation wall of the back surface of the refrigerator 30 can be reduced.

  Further, the cold air cooled by the cooler 44 spreads around the heat transfer, but the refrigerating room suction air passage 87 and the switching room suction air passage 90 installed on the back surface of the cooler 44 pass through the refrigerating room 35 and When the return cold air from the switching chamber 36 flows, the cold air leaking from the cooler 44 is absorbed and returned to the cooling chamber 43 again, so that the cold air leakage to the outside of the refrigerator 30 is suppressed and the power consumption is reduced. can do.

(Embodiment 2)
FIG. 5 is a schematic longitudinal sectional view of the refrigerator according to Embodiment 2 of the present invention, FIG. 6 is a schematic longitudinal sectional view of the refrigerator according to Embodiment 2 of the present invention, and FIG. 7 is refrigeration of the refrigerator according to Embodiment 2 of the present invention. FIG. 8 is a schematic perspective view showing a cool air discharge air passage to the switching room of the refrigerator in Embodiment 2 of the present invention, and FIG. 9 is in Embodiment 2 of the present invention. 10 is a schematic cross-sectional view showing a refrigerator switching chamber and a cold air discharge air passage, FIG. 10 is an exploded configuration diagram of a heat insulating partition wall between the refrigerator switching chamber and the freezer compartment in Embodiment 2 of the present invention, and FIG. 11 is an embodiment of the present invention. FIG. 12 is a schematic cross-sectional view showing a cool air suction air passage around the refrigerator cooler in Embodiment 2, FIG. 12 is a schematic front view showing a cool air suction air passage around the refrigerator cooler in Embodiment 2 of the present invention, and FIG. Refrigerator cooler in Embodiment 2 of the present invention Schematic front view of a cold air suction air passage from the refrigeration compartment, Figure 14 is a side schematic view of a cold air suction air passage from the refrigerating compartment and refrigerator cooler in the second embodiment of the present invention.

  In addition, about the same structure as Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted. The first embodiment and the technical idea can also be applied to this embodiment.

  In the figure, the refrigerator 30 has a heat insulating box 31 formed from an outer box 32, an inner box 33, and a foam heat insulating material 34 filled therebetween, and the inside is formed into a first partition wall 71 and a second partition wall 72. Are partitioned. The uppermost part is provided with a refrigerator compartment 35, a freezing room 37 below the second partition wall 72, and a lowermost part below the first partition wall 71 is provided with a switching chamber 36 capable of switching the storage temperature from freezing to vegetables.

  In the freezer compartment 37, an ice making chamber 38 and an upper freezer compartment 39 are provided, and a lower freezer compartment 40 is provided in the lower part thereof.

  Further, on the front face of the refrigerating room 35, there is a rotary refrigerating room door 35A, a switching room 36, an ice making room 38, an upper freezing room 39, and a lower freezing room 40 on the front side, respectively, with a drawer type switching room door 36A and an ice making room. A door 38A, an upper freezer compartment door 39A, and a lower freezer compartment door 40A are provided.

  In addition, a chilled case 41 set at a temperature slightly lower than that of the refrigerator compartment is provided at the lower part of the refrigerator compartment 35, and can be pulled back and forth.

The refrigerator compartment duct cover 81 provided on the back of the refrigerator compartment 35 forms a refrigerator compartment discharge air passage 85 on the rear side, has a plurality of discharge ports 82 on the upper side, and communicates with the refrigerator compartment suction air passage 87 on the lower side. A chamber suction inlet 83 is provided.

  The refrigerator compartment suction inlet 83 is disposed on the back surface of the chilled case 41, and the cold air discharged into the refrigerator compartment 35 cools the inside, and flows into a gap formed between the chilled case 41 and the second partition wall 72, The refrigerator compartment suction inlet 83 passes through the refrigerator compartment suction air passage 87 and returns to the cooling chamber 43.

  Further, the chilled case 41 is cooled to a temperature of about 0 to 3 ° C. lower than that of the refrigerator compartment 35, and a chilled case suction inlet portion 84 for returning cold air from the chilled case 41 to the cooling chamber 43 is provided on the back surface of the chilled case 41. It is arranged side by side with the refrigerator compartment suction inlet 83.

  The cool air from the cooling chamber 43 to the switching chamber 36 flows from the distribution air passage 51 to the switching chamber discharge air passage 86 through the switching chamber damper 80 provided in the first partition wall 71 and flows into the switching chamber 36. To do.

  Here, the switching chamber damper device 92 having the switching chamber damper 80 therein includes a switching chamber damper device front plate 93, a switching chamber damper device rear plate 94, and a heat insulating material 95 provided therebetween. A switching chamber damper 80 is inserted in a space (air passage) provided in the.

  When the switching chamber damper device 92 is attached to the first partition wall 71 in advance, the first partition wall 71 is incorporated in the heat insulation box 31 and the heat insulation box 31 is filled with the foam insulation 34. The wall 71 is filled at the same time.

  Further, the downstream side of the switching chamber damper 80 provided in the switching chamber damper device 92 is branched into a plurality of parts, and cool air is blown from the plurality of switching chamber discharge ports 96 </ b> A, 96 </ b> B to the switching chamber 36. The switching chamber discharge port 96A is discharged from above the switching chamber 36 into the upper switching chamber case 97, and the switching chamber discharge port 96B is discharged from the rear of the switching chamber 36 into the lower switching chamber case 98. Thereby, the temperature nonuniformity in the switching chamber 36 can be reduced, and a predetermined temperature distribution can be maintained.

  The first partition wall 71 has a heat insulating material 75 corresponding to the drain pan 48 and a switching chamber return duct cover 76 between the first partition wall upper plate 73 and the first partition wall lower plate 74 in advance. The first partition wall 71 is incorporated in the heat insulating box 31 and the first partition wall 71 is simultaneously filled when the heat insulating box 31 is filled with the foam heat insulating material 34.

  The cool air returning from the switching chamber 36 to the cooling chamber 43 is a space formed between the switching chamber return duct cover 76 and the first partition wall lower plate 74, and the heat insulating material 75 and the first partition wall corresponding to the drain pan 48. 71 passes through the space formed between the rear surfaces of 71 (between the heat insulating material 75, the first partition wall lower plate 74, and the first partition wall upper plate 73) and returns to the cooling chamber 43.

  That is, the cool air returning from the switching chamber 36 to the cooling chamber 43 passes through the lower part and the rear part of the drain pan 48 from the switching chamber return duct cover 76 provided on the top surface of the switching chamber 36 and passes through the switching chamber suction port on the rear surface of the cooling chamber 43. 89 returns to the cooler 44 (see FIG. 13).

  Moreover, the refrigerator compartment suction port 88 provided in the back surface of the cooling chamber 43 which returns to the cooling chamber 43 via the refrigerator compartment suction air path 87 from the refrigerator compartment 35 is arrange | positioned corresponding to the substantially full width of the cooler 44, A portion adjacent to the switching chamber suction port 89 from the switching chamber 36 to the cooling chamber 43 is provided with a stepped portion, and a switching chamber suction port 89 is provided below the stepped portion.

  Moreover, as shown in FIG. 13, the refrigerator compartment suction air path 87 is comprised by the plate-shaped cover formed in another member between the cooler 44 and the inner box 33 of the heat insulation box 31, and upper part is made into a refrigerator compartment. The lower part is connected to the connection part 91, and the lower part is comprised as the refrigerator compartment suction inlet 88. FIG.

  And the width dimension of the refrigerator compartment connection part 91 is narrower than the width dimension of the refrigerator compartment suction inlet 88, and the depth dimension of the refrigerator compartment connection part 91 is set wider than the depth dimension of the refrigerator compartment suction inlet 88. FIG.

  Further, in the left-right direction of the back surface of the cooling chamber 43, the refrigerating room connecting portion 91 and the switching room suction port 89 disposed adjacent to the refrigerating room suction port 88 are disposed to face each other.

  The operation and effect of the above configuration will be described below.

  The switching chamber damper device 92 having the switching chamber damper 80 therein includes a switching chamber damper device front plate 93, a switching chamber damper device rear plate 94, and a heat insulating material 95 provided therebetween, and is provided inside the heat insulating material 95. The switching chamber damper 80 is inserted into the space (wind passage), and the switching chamber damper device 92 is attached to the first partition wall 71 in advance, and the first partition wall 71 is incorporated into the heat insulation box 31, By simultaneously filling the first partition wall 71 when filling the foam heat insulating material 34, the damper device can be arranged in advance on the heat insulating partition wall, and the assembly workability of the refrigerator can be improved. Therefore, the switching chamber damper device 92 can be reliably arranged at a predetermined position without requiring an excessive work in the assembly process.

  Further, the downstream side of the switching chamber damper 80 provided in the switching chamber damper device 92 is branched into a plurality of parts, and cool air is blown from the plurality of switching chamber discharge ports 96 </ b> A, 96 </ b> B to the switching chamber 36. The switching chamber discharge port 96A is discharged from above the switching chamber 36 into the upper switching chamber case 97, and the switching chamber discharge port 96B is discharged from the rear of the switching chamber 36 into the lower switching chamber case 98. Thereby, the temperature nonuniformity in the switching chamber 36 can be reduced, and a predetermined temperature distribution can be maintained.

  Further, the cool air returning from the switching chamber 36 to the cooling chamber 43 is formed by the space formed between the switching chamber return duct cover 76 and the first partition wall lower plate 74, and the heat insulating material 75 and the first partition wall corresponding to the drain pan 48. It returns to the cooling chamber 43 through the space formed on the back surface of 71. That is, the return cold air passes from the inside of the switching chamber return duct cover 76 provided on the top surface of the switching chamber 36 through the lower and rear portions of the drain pan 48 and returns to the cooler 44 from the switching chamber suction port 89 on the rear surface of the cooling chamber 43. The front surface of the cooling chamber 43 can be used as a return cold air inlet of the freezing chamber 37 over the entire width, and the cooling capacity of the freezing chamber 37 can be enhanced.

  Moreover, the refrigerator compartment suction port 88 provided in the back surface of the cooling chamber 43 which returns to the cooling chamber 43 via the refrigerator compartment suction air path 87 from the refrigerator compartment 35 is arrange | positioned corresponding to the substantially full width of the cooler 44, The portion adjacent to the switching chamber suction port 89 from the switching chamber 36 to the cooling chamber 43 is provided with a stepped portion, and the switching chamber suction port 89 is provided below the stepped portion, so that the return cold air from the refrigerator compartment 35 Can be efficiently returned to the cooler 44, and the return cold air from the switching chamber 36 can also be efficiently returned to the cooler 44.

  Moreover, since the refrigerator compartment suction inlet 83 is provided in the back of the chilled case 41 below the refrigerator compartment duct cover 81 provided in the back of the refrigerator compartment 35, the refrigerator compartment suction inlet 83 is hidden behind the chilled case 41. As a result, the design can be improved. Furthermore, the design freedom of the refrigerator compartment suction inlet part 83 increases, and the design property of the refrigerator compartment duct cover 81 whole can also be improved.

  Further, the chilled case 41 is cooled to a temperature of about 0 to 3 ° C. lower than that of the refrigerator compartment 35, and a chilled case suction inlet portion 84 for returning cold air from the chilled case 41 to the cooling chamber 43 is provided on the back surface of the chilled case 41. Since it is arranged side by side with the refrigerator compartment suction inlet 83, the chilled case suction inlet 84 is also hidden behind the chilled case 41, and the design including the chilled case suction inlet 84 is improved. Can do. Thereby, the designability of the whole inside of the refrigerator compartment 35 can be improved.

  As described above, the configuration of the refrigerator according to the present invention can improve the heat exchange amount of the cooler without increasing the pressure loss of the air passage. It is applicable to a cooling device that circulates heat to exchange heat.

30 Refrigerator 31 Heat insulation box 32 Outer box 33 Inner box 34 Foam insulation 35 Refrigerating room (first high temperature storage room)
35A Cold room door 36 Switching room (second high temperature storage room)
36A Switching room door 37 Freezer room (low temperature storage room)
37A Freezing room door 38 Ice making room 38A Ice making room door 39 Upper freezing room 39A Upper freezing room door 40 Lower freezing room 40A Lower freezing room door 41 Chilled case (storage case)
42 Refrigerating chamber damper 43 Cooling chamber 44 Cooler 44B Lower end of cooler 45 Vertical partition wall 46 Blower 47 Defrost heater 48 Drain pan (cooling chamber bottom)
49 Drain tube 50 Evaporating dish 53 Freezer compartment air inlet 53A Inlet 56 Freezer compartment inlet (low temperature inlet)
59 glass tube heater 60 heater cover 71 first partition wall 72 second partition wall 73 first partition wall upper plate 74 first partition wall lower plate 75 heat insulating material 76 switching chamber return duct cover 80 switching chamber damper 81 refrigeration chamber duct cover 82 Discharge port 83 Refrigerating room suction inlet portion 84 Chilled case suction inlet portion 85 Refrigerating room discharge air passage 86 Switching room discharge air passage 87 Refrigerating room suction air passage (high temperature suction air passage)
88 Refrigerating room inlet (first high temperature inlet)
88A Refrigeration room suction port top (first high temperature suction port top)
89 Switching room inlet (second high temperature inlet)
89A Switching room suction port upper end (second high temperature suction port upper end)
90 Switching room suction air passage (high temperature suction air passage)
91 Cold room connection (first high temperature storage room connection)
92 switching chamber damper device 93 switching chamber damper device front plate 94 switching chamber damper device rear plate 95 heat insulating material 96A, 96B switching chamber discharge port 97 upper switching chamber case 98 lower switching chamber case 201 refrigerant tube 202 plate fin 203 long hole

Claims (3)

A refrigerator comprising a refrigerating chamber and a cooling chamber for storing a cooler for generating cold air, wherein a storage case having a temperature zone different from that of the refrigerating chamber is provided at a lower portion of the refrigerating chamber, and the cooling chamber is provided with the storage chamber. Both a first suction inlet portion for returning cold air to the storage chamber and a second suction inlet portion for returning cold air from the storage case to the cooling chamber are disposed on the back surface of the storage case, and the first suction inlet portion is A refrigerator arranged below the second suction inlet .   The refrigerator according to claim 1, wherein the storage case has a temperature lower than that of the refrigerator compartment. The return air path of the refrigerator compartment is guided to the first suction inlet through a gap formed between the storage case and a partition wall below the storage case. Refrigerator.

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