JP2007093153A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator for uniformly and efficiently cooling a refrigerating chamber. <P>SOLUTION: The refrigerator 1 comprises a refrigerating cycle including a compressor 23 and a cooler 9. A cooling plate 17 is provided on the back of the refrigerating chamber 2. The cooling plate 17 is cooled by a pipe 21a connecting the cooler 9 to the compressor 23 and the refrigerating chamber is wholly cooled from its back face side, thereby equalizing a temperature in the refrigerating chamber 3. The cooling plate 17 has a holed portion, and a cold passage 13a on the back face side for blowing cold from the holed portion. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a refrigerator.

  There exists a structure of patent document 1 as a refrigerator which equips the back side of a freezer room with a cooler, and supplies the cold air produced | generated with the cooler to a freezer room and a refrigerator compartment with an air blower. A conventional refrigerator of this type will be described with reference to FIGS.

  FIG. 18 is a perspective view showing the entire configuration of a conventional refrigerator, FIG. 19 is a view showing the structure of the refrigerator compartment, and FIG. 19A is a front view of the refrigerator compartment as seen from the door (door) side. 19 (b) is a cross-sectional view cut along a horizontal plane.

  In these drawings, the refrigerator main body 51 has a freezer compartment 52 and a refrigerator compartment 53 therein. The freezing compartment 52 and the refrigerating compartment 53 are closed at the front opening by the freezing compartment door 54 and the refrigerating compartment door 55. A cooler 56 is provided in a cooler chamber provided at the back of the freezer compartment 52, and a blower 58 is provided at the upper portion of the cooler 56. The blower 58 forcibly circulates the cold air exchanged with the cooler 56 to the freezer compartment 52 and the refrigerator compartment 53.

  That is, in the freezer compartment 52, the cool air that has passed through the cooler 56 by the blower 58 is blown out from the outlet on the back side of the freezer compartment 52 to the freezer compartment 52, and after heat exchange with food in the freezer compartment 52, cooling is performed from the return passage A cold air circulation path returning to the vessel 56 is formed.

  On the other hand, on the refrigerating room 53 side, the cold air that has passed through the cooler 56 is forcibly sent to the cold air duct to the refrigerating room 53 by the blower 58. Then, the cool air is sent to a cool air duct 66 provided on the refrigerating chamber 53 side through a damper thermo provided in the refrigerating chamber 53. The cold air sent to the cold air duct 66 is blown out to the refrigerating room 53, and after exchanging heat with the refrigerated food in the refrigerating room 53, a cold air circulation path returning to the cooler room from the return port 67 is formed. At this time, the damper thermostat adjusts the amount of cold air entering the refrigerating chamber 53, and the inside of the refrigerating chamber 53 is cooled to a set temperature.

  Further, the cold air blown through the damper thermostat flows along both sides (side walls of the inner box 51a constituting the refrigerator main body 51) of each shelf 65 provided in a plurality of stages in the refrigerator compartment 53 as shown in FIG. It blows out like the arrow shown in FIG. And it cools so that the foodstuff on the shelf 65 may be wrapped from both sides with the blown-out cold air.

  Moreover, there exists a structure of patent document 2 as another refrigerator which supplies the cold air produced | generated with the cooler of the back side of a freezer compartment to a freezer compartment and a refrigerator compartment with a fan. In this configuration, a part of the cool air that is blown out is caused to flow along the member, and the temperature in the room is made uniform. Patent Document 3 discloses a configuration in which a pipe (suction pipe) connecting between an evaporator and a compressor and a capillary tube are heat-exchanged.

JP-A-6-213550

JP 2001-221554 A JP 2002-372316 A

  The conventional refrigerator as described above has the following problems.

  1. In the configuration of Patent Document 1, as shown in FIGS. 18 to 19, cold air is flowed along the side wall of the inner box using a cold air duct 66, and the food is cooled so as to be wrapped from both sides. In such a refrigerator, the temperature in the center of the refrigerator compartment tended to be higher than the temperatures on both sides. This is because the cold air blown from the cold air duct 66 for cooling the refrigerator compartment is returned to the cooler 56 from the second return port 67 provided on the front side of the refrigerator compartment without cooling the center of the refrigerator compartment. This is because the food in the center of the refrigerator cannot be cooled sufficiently.

  2. The cool air that cools the inside of the refrigerator compartment 53 is restricted by opening and closing the damper thermo, even if the refrigeration cycle including the compressor and the blower are driven. Therefore, the cool air may not be supplied unless the temperature in the refrigerator compartment is uniform due to the temperature detection position of the damper thermostat. For this reason, the temperature non-uniformity may be generated in the refrigerator compartment.

  In particular, in the refrigerator of the type that draws in cold air from both side walls as in Patent Document 1, the above problems 1 and 2 have become more obvious due to the arrangement of food.

  3. The refrigeration cycle used in this type of refrigerator effectively stores this low temperature even though the temperature of the pipe through which the refrigerant passes after passing through the cooler (so-called suction pipe or suction pipe) is -30 ° C. It could not be said that it was used effectively for cooling inside. For example, in Patent Document 3, the heat exchange with the capillary tube is performed, but the structure is embedded in the heat insulating material.

  4). In the refrigerator in which the cold air that has passed through the cooler from both sides of the back wall of the refrigerating room is blown out from the cold air duct provided on the back side wall, as mentioned in the first item above, it is compared with both sides of the refrigerating room. There was a problem that the cooling in the center was weakened and the temperature in the refrigerator compartment was not uniform. In Patent Document 2, cold air is made to flow along the surface of the member to equalize the temperature in the refrigerator compartment. However, a part of the cold heat of the circulating cold air is used, and the air is blown into the chamber accordingly. The cool air that will be reduced.

  This invention is made | formed in view of the said subject, and it aims at providing the refrigerator which cools a refrigerator compartment efficiently uniformly.

  In order to achieve the above object, in a refrigerator provided with a refrigeration cycle including a compressor and a cooler, the present invention includes a cooling plate on the back of the refrigerator compartment, and a pipe connecting the cooler and the compressor. The cooling plate was cooled.

  The cooling plate is attached to the inner box at the back of the refrigerator compartment, the pipe is attached to the heat insulating material side from the inner box, and the cooling plate and the pipe are in thermal contact with each other through the inner box. It was set as the structure to do.

  The pipe is disposed in a concave groove formed in thermal contact with a capillary tube constituting the refrigeration cycle, and the inner box is bulged toward the refrigerator compartment, and the capillary tube is disposed in the concave groove. It was set as the structure located in the place remove | deviated from the groove | channel.

  Further, in the pipe having any one of the configurations described above, the pipe cools the cooling plate in a region where the surface temperature is 0 ° C. or less in the refrigerant pipe connecting the cooler and the compressor. did. In addition, the cooling plate is cooled at a portion where the distance from the cooler is approximately ½ or less of the total length of the refrigerant pipe.

Further, in the refrigerator having a freezing room and a refrigeration room, a cooler is disposed on the freezing room side, and cold air from the cooler is forcibly circulated to the freezing room and the refrigeration room by a blower,
The present invention comprises a cooling plate for cooling the refrigerator compartment wide from the back of the refrigerator compartment,
An opening on the refrigeration chamber side of the cold air return passage for returning the chilled air after cooling the refrigeration chamber to the cooler was provided on the front side of the refrigeration chamber.

  Further, in any one of the above-described configurations, a cold air duct for supplying cold air to the refrigerating room is provided on both sides of the back surface of the refrigerating room, and the cooling plate is disposed between the cold air ducts. Then, cold air was allowed to flow on the back side surface of the cooling plate.

Further, a cooling plate is provided at the back of the refrigerator compartment, and the cooling plate is cooled by a pipe connecting the cooler and the compressor, and the pipe is closer to the heat insulating material than the inner box, and Arranged in a concave groove formed by bulging the inner box toward the refrigerator compartment, the cooling plate and the pipe are in thermal contact with each other through the inner box,
A second cold air duct on the back side of the cooling plate;
A heat insulating material is provided between the cooling plate and the inner box,
The cold duct and the concave groove are configured to be accommodated within the thickness of the heat insulating material.

  The cooling plate has a hole communicating with the second cold air duct and the refrigerating chamber, and the cold air of the second cold air duct is blown out from the hole to the refrigerating chamber.

  In addition, a cold air duct for supplying cold air sent from the cooler to the refrigerating chamber is provided on both sides of the back surface of the refrigerating chamber, and the second cold air duct has a space between the cold air duct and the hole. The configuration is tied.

  In addition, the pipe was brought into thermal contact with the capillary tube constituting the refrigeration cycle, and the capillary tube was positioned away from the concave groove.

  Further, a damper thermo is provided on a cool air passage for sending cool air from the cooler to the cool air duct, and the supply of the cool air to the refrigerator compartment is controlled by opening and closing the damper thermo.

  In addition, a plurality of holes for blowing out the cold air flowing through the second cold air duct to the refrigerator compartment side are provided.

  Further, the opening of the hole is made smaller than the blowout port for blowing out cold air from the cold air duct to the refrigerator compartment.

  ADVANTAGE OF THE INVENTION According to this invention, the refrigerator which cools a refrigerator compartment efficiently efficiently can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. The present embodiment relates to a refrigerator that cools cold air with a cooler installed on the freezer compartment side and blows the cold air into a freezer compartment and a refrigerator compartment with a blower provided on the freezer compartment side. It relates to a refrigerator provided with a cooling plate for cooling the refrigerator.

  1 is a front view showing the rear structure of the refrigerator of the present embodiment, FIG. 2 is a longitudinal sectional view taken along the line AA in FIG. 1, FIG. 3 is a transverse sectional view taken along the line BB in FIG. The enlarged view of P part of 2 is shown, respectively. FIG. 5 is an enlarged view of a portion P in FIG. 2 and shows an example of a structure different from that in FIG.

  In these drawings, reference numeral 1 denotes a refrigerator main body, which has at least a freezer compartment 2 and a refrigerator compartment 3 as a storage compartment. Reference numerals 4 and 5 denote doors that close the front openings of the freezer compartment 2 and the refrigerator compartment 3, respectively, 4 denotes a freezer compartment door, and 5 denotes a refrigerator compartment door.

  A cooler chamber 6 separated from the freezer compartment 2 by a partition plate 7 is formed at the back of the freezer compartment 2, and a cooler 9 and a circulation fan 10 are installed in the cooler chamber 6. And it has the structure where the cool air produced | generated by the cooler 9 is sent to each store room by the circulation fan 10 located above the cooler 9. FIG. Specifically, in the present embodiment, the fan guard 8 formed integrally or separately with the partition plate 7 is provided with a blowing port 8a, and the cold air blown by the circulation fan 10 is supplied from the blowing port 8a to the freezer compartment 2. Supplied to.

  The cold air blown out from the outlet 8 a as shown by the arrow in FIG. 2 exchanges heat with the food stored in the freezer compartment 2, and then from the inlet 8 b below the cooler 9 to the cooler compartment 6. Returned to. As shown in FIG. 2, the outlet 8a is located above the cooler 9, and the suction port 8b is located below the cooler 9, and the cool air is circulated by flowing the cool air in the direction of the arrow. . By repeating this cold air circulation, the freezer compartment 2 is maintained at a predetermined temperature, for example, −18 ° C.

  A defrosting heater 11 is disposed below the cooler 9 and periodically removes frost attached to the cooler 9 during operation of the refrigeration cycle. The defrosting heater 11 is a glass tube heater that has a heater wire in a glass tube and generates heat when the heater wire is energized.

  The refrigerator compartment 3 is adjacent to the freezer compartment 2 via a partition wall. There is a heat insulating material 24 in the partition wall to insulate between the two chambers. The cold air generated by the cooler 9 is also supplied to the refrigerating chamber 3, and the cooler chamber 6 and the refrigerating chamber 3 are communicated with each other via a cold air duct 13. A damper thermo 12 keeps the inside of the refrigerating chamber 3 at a set temperature. The damper thermo 12 serves to control the amount of cold air blown out toward the refrigerating chamber 3 by the circulation fan 10.

  When the amount of cold air is controlled by the damper thermostat 12, the refrigerator compartment 3 is maintained at a predetermined set temperature. The cold air blown into the refrigerating chamber 3 is blown out along the side wall 1b of the inner box 1a from both sides of the back of the refrigerating chamber 3 as shown in FIGS. The Further, the cold air in the cold air duct 13 is configured so that the cold air is blown out between the shelf boards 14 installed in the refrigerator compartment 3.

  The cold air thus blown out along the side wall 1b exchanges heat with the refrigerated food between the shelves 14 from the side wall 1b side, and enters the cooler chamber 6 via the cold air return passage 15 provided in the heat insulating partition wall as shown in FIG. Returned. By repeating such cold air circulation, the refrigerator compartment 3 is maintained at a predetermined temperature, for example, + 3 ° C.

  However, in this kind of refrigerator, there is a tendency that the cold air blown out along the side wall 1b does not rotate much for cooling the three centers of the refrigerator compartment. That is, there is a case where the cold air heat-exchanged with the food stored near the side wall 1b flows toward the cold air return passage 15 without going to the vicinity of the central portion. Therefore, in the present embodiment, a cooling plate 17 is provided to cool the food stored in the central portion of the refrigerator compartment 3.

  The cooling plate 17 of the present embodiment is made of a material having good heat conductivity such as metal, and is generally an aluminum plate or a copper plate. However, the present invention is not limited to these, and any resin plate having good thermal conductivity may be used.

  The cooling plate 17 is provided between the two cold air ducts 13 extending vertically on both sides of the back side of the refrigerating room 3 and is attached to the back wall of the refrigerating room 3 (shown in FIG. 1). Moreover, as shown in FIG. 3, it attaches so that between the both cold air ducts 13 may be connected. And as a heat source (cooling heat source) which cools this cooling plate 17, the pipe | tube which comprises the refrigerant | coolant piping of a refrigerating cycle is used in a present Example. The cold air that has passed through the damper thermo 12 may be used together. Hereinafter, a description will be given with reference to FIG.

  The cold air sent from the cooler room 6 to the refrigerating room 3 via the damper thermo 12 branches to the left and right at the back of the refrigerating room 3 and blows out to the refrigerating room 3 through a pair of cold air ducts 13 extending vertically. Is done. The damper thermo 12 and the cold air duct 13 are connected by a first cold air duct 18. As shown in FIG. 1, the cooling plate 17 is attached to the back wall between the left and right cold air ducts 13 so as to cover the first cold air duct 18.

  The cooling plate 17 of this embodiment is provided with a hole 19. A hole 19 a is provided in a portion facing the first cold air duct 18. Therefore, a part of the cold air passing through the first cold air duct 18 is blown out from the hole portion 19a to the refrigerator compartment 3. The blown-out air cools the food in the refrigerator compartment 3 and contributes to the cooling of the cooling plate 17 itself.

  That is, the cold air blown out from the hole portion 19a is blown out to the refrigerator compartment 3 side while cooling the cooling plate 17, and is returned to the cooler chamber 6 through the cold air return passage 15 after the food is cooled. In addition, the size of the hole 19 is made smaller than the blow-out port that blows out cold air from the cold air duct 13 to the refrigerator compartment 3. The reason for this will be described later.

  A heat insulating material 20 such as styrofoam is attached to the back side of the cooling plate 17 (the rear side of the refrigerator compartment 3). By providing the heat insulating material 20 between the cooling plate 17 and the inner box 1a, the cold heat of the cooling plate 17 is transmitted to the inner box 1a, thereby preventing the inner box 1a from being exposed.

  Moreover, if the 1st cold air duct 18 is formed in the board thickness of the heat insulating material 20, the sacrifice of the storage space in the refrigerator compartment 3 can be made small, and the refrigerator compartment 3 can be organized neatly.

  On the back side of the cooling plate 17, a pipe 21 a serving as a cooling heat source for cooling the cooling plate 17 is provided. The pipe 21a is a part of the refrigerant pipe constituting the refrigeration cycle. Specifically, the pipe 21a is a part connecting the cooler 9 and the compressor 23 in the refrigerant pipe.

  In the refrigeration cycle, the high-temperature and high-pressure refrigerant compressed by the compressor 23 evaporates in the cooler 9 through the condenser and the capillary tube 22 to generate cold air. The refrigerant evaporated in the cooler 9 is returned to the compressor 23 through the pipe 21 a, and this low-temperature refrigerant is used as a cold heat source for the cooling plate 17.

  In the following description, a pipe that is sucked into the compressor 23 through the cooler 9 is referred to as a suction pipe (suction pipe). That is, the cooling plate 17 of this embodiment is a pipe 21a (“pipe” that forms part of the suction pipe. 21a "or" suction pipe 21a ").

  Further, the suction pipe 21a is disposed so as to be able to exchange heat with the capillary tube 22. The capillary tube 22 is a small-diameter tube having an inner diameter of about 0.7 to 0.8 mm provided between the condenser and the cooler 9 for the purpose of reducing the pressure of the refrigerant, and has an outer diameter of 3.0 to 3.2 mm. have. On the other hand, the suction pipe 21a is composed of a round tube having an outer diameter of 6.0 to 8.0 mm and an inner diameter of 4.8 to 6.5 mm.

  As shown in FIG. 2, the suction pipe including the suction pipe 21a and the capillary tube 22 are usually welded using solder or the like. The welded suction pipe and the capillary tube 22 are embedded in a heat insulating material 24 filled between the inner box 1a and the outer box of the refrigerator body 1.

  As shown in FIG. 4, a recessed groove 25 is provided on the back side of the cooling plate 17 so that the heat insulating space between the inner box 1 a and the outer box bulges to the refrigerator compartment 3 side. A suction pipe 21 a is disposed in the concave groove 25. The capillary tube 22 is disposed further rearward than the suction pipe 21a disposed in the concave groove 25 so as to be able to exchange heat with the suction pipe 21a. In the configuration of this embodiment, the capillary tube 22 does not enter the concave groove 25 but is positioned on the heat insulating material 24 side, and the concave groove 25 is provided so as to contact the cooling plate 17. With this configuration, the low temperature of the suction pipe 21a is conducted to the cooling plate 17 through the plate thickness of the inner box 1a.

  FIG. 5 shows an example of a structure different from that in FIG. 4 has a structure in which the suction pipe 21a having a circular cross-sectional shape is disposed in the circular concave groove 25. In the example of FIG. 5, the cross-sectional shape of the suction pipe 21a is a flat shape such as an elliptical shape. The concave groove 25 has a rectangular shape. According to this structure, the contact area between the inner box 1a and the cooling plate 17 and the effective area of the suction pipe 21a serving as a cold heat source can be increased, and the conduction of cold heat can be improved.

  Next, the arrangement structure of the suction pipe 21a will be described with reference to FIGS. 6 is a Mollier diagram of the refrigeration cycle in the refrigerator, FIG. 7 is a longitudinal sectional view of the refrigerator showing the piping configuration of the refrigeration cycle, FIG. 8 is a temperature measurement diagram of the suction pipe 21a, and FIG. FIG. 10 is a schematic diagram of a refrigeration cycle including an intake pipe 21a, FIG. 10 is a schematic diagram of a refrigeration cycle showing an example different from FIG. 9, and FIG. 11 is a schematic diagram of a refrigeration cycle showing an example different from FIGS. 12 is a cross-sectional view taken along the line CC of FIG.

9-11 has shown an example of the refrigerating cycle of a present Example. A compressor 23, a condenser 26, a dryer 27 that adsorbs moisture in the refrigeration cycle, a capillary tube 22, a cooler (evaporator) 9, and a suction pipe 21 including a suction pipe 21a for cooling the refrigerator compartment are annular and in series. To constitute a refrigeration cycle. Then, L ₁ dimension portion of the suction pipe 21 and the capillary tube 22, both to allow the heat exchanger, (shown in FIG. 12) which are in close contact with the welding or soldering 28 or the like.

  The operation of the refrigeration cycle configured as shown in FIGS. 9 to 11 will be described. The high-temperature and high-pressure gaseous refrigerant discharged from the compressor 23 is condensed and liquefied by exchanging heat with the outside air in the condenser 26. After that, the refrigerant is decompressed by the capillary tube 22 and becomes a low pressure, and the refrigerant (evaporator) 9 evaporates while taking away the surrounding heat to generate cold air. The generated cold air is sent into the freezer compartment 2 and the refrigerator compartment 3 by the circulation fan 10 (shown in FIG. 2), and each storage compartment is cooled. The refrigerant vaporized by the cooler 9 is returned to the compressor 23 through the suction pipe 21.

  As described above, the capillary tube 22 and the suction pipe 21 are disposed in the heat insulating material constituting the refrigerator box. The vaporized low-temperature gas refrigerant in the suction pipe 21 and the refrigerant in the capillary tube 22 exchange heat, the refrigerant in the capillary tube 22 has an enthalpy in the supercooling direction, and the gas refrigerant in the suction pipe 21 has an enthalpy in the superheat direction. Decrease and increase. This improves the effective refrigerant capacity of the refrigeration cycle.

If these refrigeration cycles are shown on the Mollier diagram, the diagram shown by the broken line in FIG. 6 is obtained. 6, the line A indicates the compression process, the line B indicates the condensation process, the line C indicates the depressurization process, and the line D indicates the evaporation process, and the projection line onto the horizontal axis (enthalpy) of the line D (I ₃ -i ₁ ), i ₂ -i ₁ represents the refrigeration capacity, i ₃ -i ₂ represents the heat exchange of the suction pipe, and i ₀ -i ₁ represents the heat exchange of the capillary tube. The minutes i ₃ -i ₂ and i ₀ -i ₁ are equivalent.

  With these refrigeration cycles incorporated in the refrigerator, the temperature measurement results at each point of the suction pipe 21 and the capillary tube 22 will be described with reference to FIGS. The specifications of the suction pipe 21 and the capillary tube 22 used in a general refrigerator are as follows.

The suction pipe 21 has a length of 1700 to 2500 mm, an outer diameter of 6.0 mm to 8.0 mm, and an inner diameter of 4.8 mm to 6.5 mm. The capillary tube 22 has a length of 1800 mm to 2600 mm, an outer diameter of 3.0 mm to 3.2 mm, and an inner diameter of 0.7 mm to 0.8 mm. The length _{L 1} dimension of soldering portions of both of which are set in this case 1200Mm～1800mm.

  Further, the introduction part (one end part) of the suction pipe 21 and the capillary tube 22 to the refrigerator box 1 is the E point of the machine room 29 as shown in FIG. 7, and the lead-out part (the other end part) is the F point. Yes, it is embedded in the heat insulating material 24.

FIG. 8 shows the surface temperature of the suction pipe 21 up to point F, where point E is 0 mm in length. At the point F, the surface temperature of the suction pipe 21 is −30 ° C., and at the point E, it is + 30 ° C. Therefore, soldering length (L ₁ dimension) as in the present embodiment as long as it is 1800 mm, near about 900mm as a waypoint (G point) is about 0 ° C.. That is, the suction pipe 21a that exchanges heat with the cooling plate 17 shown in FIGS. 4 to 5 is between point E and point G, and is between 0 and 900 mm.

  In the present embodiment, the machine room 29 in which the compressor 23 is disposed is located at the lower part of the refrigerator box 1, the cooler 9 is located at the back of the freezer room 2 above the refrigerator box 1, and the machine Since the refrigerator compartment 3 is located between the chamber 29 and the freezer compartment 2, the section where the suction pipe 21 a has a low temperature of 0 ° C. or less is easily arranged on the back side of the refrigerator compartment 3. . This situation is the same even when the compressor 23 is positioned above the refrigerator box 1 and the freezer compartment 2 in which the cooler 9 is arranged is arranged below the refrigerator compartment 3.

  In addition, what can be used as the suction pipe 21a for cooling of the refrigerator compartment 3 is not limited to the numerical value of 0-900 mm. The length of 0 to 900 mm is the case of the length of the suction pipe 21 and the capillary tube 22 described in the present embodiment, and the length that can be used for cooling changes as the length changes.

  Next, in FIG. 9, FIG. 10, FIG. 11, the suction pipe 21a surrounded by the one-dot chain line will be described. Even after the heat exchange with the capillary tube 22, the suction pipe 21 a surrounded by the alternate long and short dash line holds a low temperature of 0 ° C. to −30 ° C., which is sufficient to cool the cooling plate 17. It becomes a cold source. That is, the suction pipe 21a used for cooling the refrigerator compartment 3 is a portion where the temperature is 0 ° C. to −30 ° C. among the suction pipes 21 connecting the cooler 9 and the compressor 23 (E point and The portion between G point) is used.

  In the example shown in FIG. 9, a part of the portion where the suction pipe 21 and the capillary tube 22 are arranged so as to be able to exchange heat is used as a suction pipe 21 a for cooling the refrigerator compartment 3. In this example, the cooling suction pipe 21a of the refrigerator compartment 3 is structured not to exchange heat with the capillary tube 22. The example shown in FIG. 10 is different from the example shown in FIGS. 2 to 5 in which the capillary tube 22 and the suction pipe 21a are in thermal contact with each other on the back surface of the cooling plate 17, and heat exchange between them is performed on the back surface of the cooling plate 17. I do not let you. Therefore, the cold energy that is taken away by the capillary tube 22 can be used for cooling the refrigerator compartment 3.

11, the purpose of contacting the portion to be the hottest in the lowest temperature portion of the suction pipe 21a of the capillary tube 22, the capillary tube 22 and the suction pipe 21a is combined flow direction of the refrigerant in the L ₁ dimension of Is. At this time, since the cross-sectional areas of the inner diameters of the suction pipe 21a and the capillary tube 22 are greatly different, the temperature of the suction pipe 21a is not greatly affected, and the cooling capacity of the refrigerator compartment 3 is not greatly reduced.

  Next, the relationship between the cooling plate 17 and the suction pipe 21a will be described with reference to FIGS. 13 and 14 are diagrams showing the arrangement structure of the suction pipe 21a. FIG. 13 shows an example in which the suction pipe 21a is arranged to meander to the left and right with respect to the cooling plate 17, and FIG. 21 a is meandered up and down so as to be parallel to both sides of the cooling plate 17.

  The length of the suction pipe 21a that is in thermal contact with the cooling plate 17 is in the range of the portion of 0 ° C. or less (for example, 0 to 900 mm) as described above. 13 and 14, the ability to cool the refrigerator compartment 3 by the cooling plate 17 basically does not change.

  Next, a description will be given with reference to FIGS.

  FIG. 15 is a diagram showing a cooling state of the present embodiment, FIG. 16 is a diagram showing a cooling structure by the cooling plate 17, and particularly a diagram showing a relationship between the suction pipe 21a and the hole portion 19, and FIG. It is CC sectional drawing.

  First, the cooling state of the present embodiment will be described with reference to FIG. The refrigeration cycle of the present embodiment detects the temperature of the freezer compartment 2 and the like and repeats operation / stop in an adiabatic manner to keep the inside of the freezer compartment 2 and the refrigerator compartment 3 at a predetermined temperature.

  For example, if the time during operation is 50, the intermittent operation is performed at an operation rate of 50% so that the time during operation stop is 50. Along with this, the cooling suction pipe 21a of the refrigerator compartment 3 is being cooled because the low-temperature refrigerant flows inside the pipe while the refrigeration cycle is in operation, and the cooling is stopped while the refrigeration cycle is stopped. That is, the cooling plate 17 is cooled by the cooling suction pipe 21a only during the operation of the refrigeration cycle.

  In this embodiment, the cooling plate 17 is cooled by cold air. Since the cool air generated by the cooler 9 is controlled to flow into the refrigerating chamber 3 by the damper thermo 12, the cool air for cooling the cooling plate 17 is linked to the opening and closing of the damper of the damper thermo 12. . That is, when the temperature in the refrigerator compartment 3 becomes higher than the set value, the damper is opened, and when the temperature in the refrigerator compartment 3 becomes lower than the preset value, the damper is closed and the supply of cold air to the refrigerator compartment is stopped.

  Therefore, when the temperature in the refrigerator compartment 3 becomes high, the damper is opened without being directly linked to the operation state of the refrigeration cycle. Then, the cold air supplied to the damper thermo 12 with the operation of the refrigeration cycle is sent to the cold air duct 13 side via the first cold air duct 18.

  At this time, a part of the cool air is blown out from the hole 19 a provided in the portion of the cooling plate 17 facing the first cool air duct 18. In this way, when the cold air is blown out from the cooling plate 17 to the refrigerating chamber 3, the food in the center of the refrigerating chamber 3 is cooled by the blown out cold air and flows in the first cold air duct 18. It is cooled by cold air and cold air generated by convection generated from the cooling plate 17 held at a low temperature by the pipe 21a.

  In other words, even if the damper is in the closed state, if the refrigeration cycle is in operation, the refrigerator compartment 3 is kept at the room temperature by the cooling effect of the low-temperature refrigerant in the pipe 21a. Further, when the temperature of the refrigerator compartment rises and the damper is in an open state, (1) the cold air is blown out from the cold air duct 13, and (2) the first cold air duct 18 is passed through the hole 19 of the cooling plate 17. The inside of the refrigerating chamber 3 is cooled by the blowout of cold air, (3) the cooling effect of the cooling plate 17 by the cold air supply, and (4) the cooling effect of the cooling plate 17 by the pipe 21a. Can be maintained.

  Next, the cooling structure of the cooling plate 17 will be described with reference to FIG. It is the second cold air duct 13a that sends the cool air discharged through the hole 19b to the position of the hole 19b. As shown in FIGS. 16 and 17, the second cold air duct 13 a is formed within the wall thickness of the heat insulating material 20 provided on the back side of the cooling plate 17. This is the same as the first cold air duct 18.

  The second cold air duct 13a communicates with the cold air duct 13 provided on the back wall of the refrigerator compartment 3, and supplies a part of the cold air supplied to the cold air duct 13 to the second cold air duct 13a. In addition, the other part of the cool air supplied to the cool air duct 13 is discharged to the refrigerator compartment 3 as shown in FIG. 1 or FIG.

  A hole 19b is provided in a portion of the cooling plate 17 facing the second cold air duct 13a. The hole 19b and the hole 19a blow out the cool air in the second cool air duct 13a and the cool air in the first cool air duct 18 to the refrigerator compartment 3 side, respectively.

  While the cold air is blown out from the holes 19a and 19b, the refrigeration cycle is naturally in operation, so that a low-temperature refrigerant flows in the suction pipe 21a. Therefore, since the suction pipe 21a has a negative temperature, the cooling plate 17 is cooled by the pipe 21a.

  As a result, convection occurs around the cooling plate 17 held at a low temperature, and the food stored in the vicinity of the cooling plate 17 is generated not only by the cold air from the holes 19a and 19b but also by the low temperature of the cooling plate 17. It is also cooled by convection air. The low-temperature, low-temperature refrigerant flowing through the pipe 21a cools the cooling plate 17 while the operation of the refrigeration cycle continues even after the cold air is blown out. Thus, the cooling by the suction pipe 21a contributes auxiliaryly to the maintenance of the temperature in the refrigerator compartment 3.

  As described above, in the present embodiment, the refrigerator compartment 3 is cooled by effectively utilizing the refrigeration cycle, and the inside of the refrigerator compartment 3 can be efficiently cooled without unevenness. Specifically, the cooling plate 17 is used to cool the cooling plate 17 by the refrigerant pipe between the cooler 9 and the compressor 23, using the low temperature of the portion where the cold heat still remains as the cooling power through the cooler 9. The refrigerating chamber 3 is totally cooled from the back side through the cooling plate 17. Therefore, it is possible to solve the problem that it is difficult for the cool air to flow around the central portion of the refrigerator compartment 3, and to reduce the temperature unevenness in the refrigerator compartment 3.

  In this case, it is also conceivable to bring the suction pipe 21a into direct contact with the cooling plate 17 (physically). However, since a part of the suction pipe 21a is cooled to a very low temperature (−30 ° C.), the temperature of the cooling plate 17 may be cooled to about −10 ° C. at this time. If the temperature difference between the temperature of the cooling plate 17 and the temperature in the refrigerator compartment 3 increases, a large amount of frost forms on the cooling plate 17, so that the cooling plate 17 cannot be exposed and installed in the refrigerator compartment 3. End up.

  Therefore, in order to raise the temperature of the cooling plate 17 that can be minus 10 ° C. to, for example, about minus 5 ° C., and to prevent the high temperature heat on the capillary tube 22 side from being brought into the refrigerator compartment 3, 21a was indirectly brought into contact with the inner box 1a. The capillary tube 22 is embedded in the heat insulating material 24. Furthermore, between the inner box 1a and the cooling plate 17, it was decided to insulate with the heat insulating material 20 (illustrated in FIG. 4 or FIG. 5).

  Even in this case, frosting or condensation on the cooling plate 17 cannot be completely avoided, so that the cooling plate 17 is provided with a gutter 30 at the lower portion to receive the falling dew (shown in FIG. 2). ). That is, the frost generated in the cooling plate 17 is melted while the refrigeration cycle is stopped, that is, while the low-temperature refrigerant is not flowing through the pipe 21a, and is dewed and dripped onto the eaves 30. .

  Moreover, since the cold air discharged from the hole portion 19 of the cooling plate 17 and the cold air of the first cold air duct 18 and the second cold air duct 13a also cool the cooling plate 17 itself, the cold air is brought into contact with the cooling plate 17. The temperature of the cooling plate 17 decreases. Therefore, the diameter of the holes 19a and 19b is made smaller than that of a normal cold air outlet (for example, a diameter of 5 mm) so that the temperature of the surface of the cooling plate 17 on the refrigerator compartment 3 side is too low to promote frost formation. 10 mm), the amount of cold air flowing through the hole 19 is made smaller than other cold air outlets. In addition, since the frost that has formed on the cooling plate 17 may be sublimated by the cold air blown out from the holes 19a and 19b, the diameter or number of the holes is determined by combining them.

  According to the above embodiment, the following effects can be expected.

  First, since the cooling plate 17 is cooled using the low temperature of the pipe connecting the cooler 9 and the compressor 23, the refrigeration cycle can be used efficiently. That is, conventionally, the low-temperature portion of the suction pipe has been used only for cooling the capillary tube 22, but since this is also used for cooling the refrigerator compartment 3, the utilization efficiency of the refrigeration cycle is improved. In addition, the portion of the refrigerator compartment 3 that is difficult to cool can be cooled by the cold heat from the cooling plate 17. In addition, since the cold air is supplied from the cooling plate 17 by the cooling plate 17 held at a low temperature or the hole portion 19 and the refrigerator compartment 3 is entirely cooled from the back side, the temperature in the refrigerator compartment 3 is made uniform. Can contribute.

  Further, since the cooling plate 17 and the pipe 21a are brought into thermal contact with each other through the inner box 1a, the pipe 21a that gives cold heat to the cooling plate 17 is located on the heat insulating material side and is isolated from the outside air. It is possible to suppress frost formation on the part. In addition, since the second cold air duct 13a connecting the hole on the cooling plate 17 side and the cold air duct is provided, the cooling plate 17 is cooled by the cold air passing through the pipe 21a and the cooler 9. Therefore, the cooler 9 itself sufficiently functions as a cooler, and can cool the refrigerator compartment evenly while also using the low temperature of the suction pipe 21a.

  Furthermore, in order to suppress the amount of cold air flowing from the hole 19 provided in the cooling plate 17, the diameter of the hole 19 is made smaller than the cold air discharge port from the other cold air duct 13. There is an effect of reducing. Moreover, it is set as the structure (For example, the structure arrange | positioned like meandering like FIG.13, FIG.14, FIG.16) which arrange | positions the pipe 21a in the cooling plate 17 so that the amount of frost formation may become small, and also the amount of frost formation is further. Reduction can be achieved.

  Further, since a plurality of the holes 19 are provided, the temperature is equalized by the low temperature of the cooling plate 17 provided wide on the back surface of the refrigerating chamber 3 and the cold air discharged from the cooling plate 17.

  Further, a suction pipe 21a in which the capillary tube 22 is brought into thermal contact by welding, soldering or the like is disposed in a concave groove 25 formed in the inner box 1a, and the capillary tube 22 is removed from the concave groove 25. Since it is positioned, the cold heat of the suction pipe 21a is conducted to the cooling plate 17 side via the inner box 1a, but it is possible to suppress the heat of the capillary tube 22 from warming the inner box 1a (cooling plate 17).

  In addition, the suction pipe 21a that gives cold heat to the cooling plate 17 that is provided wide on the back surface of the refrigerator compartment 3 is disposed so that the surface temperature becomes a negative region in the operating state. The holding effect can be enhanced. Specifically, since the portion of the pipe 21 that is in thermal contact with the cooling plate 17 is located at a location from the cooler 9 that is approximately ½ or less of the entire length, the suction pipe 21a is 0 ° C. or less, and the cooling plate 17 Can be cooled effectively.

  And since the damper thermo 12 which controls the cool air blow-out to the refrigerator compartment 3 is disposed between the cooler chamber 6 and the cool air duct which transmits the cool air to the cooling plate 17, the temperature in the refrigerator compartment 3 is controlled by the damper thermostat. 12, the cooling of the cooling plate 17 by the suction pipe 21a is also used as an auxiliary, and the inside of the refrigerator compartment 3 can be kept at the set temperature.

  Further, since the cool air after cooling the refrigerator compartment 3 is returned to the cooler chamber 6 from the cool air return passage 15 opened to the front side of the refrigerator compartment 3, it can be cooled entirely from the back side of the refrigerator compartment 3. In combination with the use of the cooling plate 17, the temperature unevenness generated in the refrigerator compartment 3 can be greatly reduced.

  Moreover, although the cold air duct 13 which blows off cold air from the back side of the refrigerator compartment 3 is provided on both sides of the back surface, the cooling plate 17 is disposed between the both cold air ducts 13, but the cooling plate 17 includes the pipe 21a and the cold air duct 18, It is set as the structure cooled by 13a. And in the back side of the cooling plate 17, the part cooled by the pipe 21a and the part cooled by the cold air ducts 18 and 13a exist, and the heat insulating material 20 is provided except these parts.

  According to these configurations, the portion where the cold air cannot be turned to the back surface of the cooling plate 17 by the cold air ducts 18 and 13a is cooled by the pipe 21a, while the portion where the pipe 21a cannot be turned is cooled by the cold air ducts 18 and 13a. Therefore, the cooling plate 17 can be cooled as a whole, and the temperature unevenness in the refrigerator compartment 3 can be further reduced.

  At this time, since the concave groove 25 and the cold air ducts 18 and 13a are accommodated in the thickness range of the heat insulating material 20, the sacrifice of the storage volume of the refrigerator compartment 3 can be kept small.

The front view which shows the back surface structure of the refrigerator of a present Example. The longitudinal cross-sectional view of the AA line of FIG. FIG. 2 is a cross-sectional view taken along line BB in FIG. 1. The enlarged view of the P section of FIG. FIG. 5 is an enlarged view of a P part in FIG. 2, illustrating an example of a structure different from that in FIG. 4. The Mollier diagram of the refrigerating cycle in a refrigerator. The longitudinal cross-sectional view of the refrigerator which shows the piping structure of a refrigerating cycle. The temperature measurement figure of a suction pipe. The schematic diagram of the refrigerating cycle provided with the suction pipe provided in the back side of a cooling plate. Schematic of the refrigerating cycle which shows the example different from FIG. Schematic of the refrigerating cycle which shows the example different from FIG.9 and FIG.10. CC sectional drawing of FIG. The figure which shows the arrangement | positioning structure of a suction pipe. The figure which shows the arrangement | positioning structure of a suction pipe. The figure which shows the cooling state of a present Example. The figure which shows the cooling structure by a cooling plate. CC sectional drawing of FIG. The perspective view which shows the whole structure of the conventional refrigerator. The figure which shows the structure of the conventional refrigerator compartment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Refrigerator main body, 1a ... Inner box, 1b ... Side wall, 2 ... Freezer compartment, 3 ... Refrigerator room, 4 ... Freezer compartment door, 5 ... Refrigerator compartment door, 6 ... Cooler room, 7 ... Partition plate, 8 ... Fan Guard, 8a ... Air outlet, 8b ... Suction port, 9 ... Cooler, 10 ... Circulating fan, 11 ... Defroster heater, 12 ... Damper thermo, 13 ... Cold air duct, 13a ... Second cold air duct, 14 ... Shelf Reference numeral 15: Cold air return passage, 17: Cooling plate, 18: First cold air duct, 19: Hole, 20: Heat insulating material, 21 ... Suction pipe, 21a ... (Suction) pipe, 22 ... Capillary tube, 23 ... Compressor, 24 ... heat insulating material, 25 ... concave groove, 26 ... condenser, 27 ... dryer, 28 ... solder, 29 ... machine room, 30 ... dredge.

Claims (14)

  The refrigerator provided with the refrigerating cycle containing a compressor and a cooler, The refrigerator which has a cooling plate in the back part of a refrigerator compartment, and cools the said cooling plate with the pipe which connects the said cooler and the said compressor.   The cooling plate is attached to the inner box at the back of the refrigerator compartment, the pipe is attached to the heat insulating material side from the inner box, and the cooling plate and the pipe are in thermal contact via the inner box. The refrigerator according to claim 1.   The pipe is disposed in a concave groove formed by thermally contacting a capillary tube constituting the refrigeration cycle, and the inner box is bulged toward the refrigerator compartment, and the capillary tube extends from the concave groove. The refrigerator according to claim 2, wherein the refrigerator is located at a position where it is detached.   The said pipe cools the said cooling plate in the area | region where surface temperature becomes 0 degrees C or less among refrigerant | coolant piping which connects the said cooler and the said compressor. Refrigerator.   5. The refrigerator according to claim 4, wherein the cooling plate is cooled at a portion where a distance from the cooler is approximately ½ or less in a total length of the refrigerant pipe. In a refrigerator having a freezing room and a refrigeration room, a cooler is disposed on the freezer room side, and cold air from the cooler is forcibly circulated to the freezer room and the refrigeration room by a blower,
A cooling plate for cooling the refrigerator compartment wide from the back of the refrigerator compartment;
A refrigerator characterized in that an opening on the cold room side of a cold air return passage for returning the cold air after cooling the cold room to the cooler is provided on the front side of the cold room.   A cold air duct for supplying cold air to the refrigerating room is provided on both sides of the back surface of the refrigerating room, the cooling plate is disposed between the cold air ducts, and the cold air is caused to flow on the back side surface of the cooling plate. The refrigerator according to any one of claims 1 to 6, wherein the refrigerator is made. The pipe is disposed on a side closer to the heat insulating material than the inner box, and is disposed in a concave groove formed by expanding the inner box toward the refrigerating chamber, and the cooling plate and the pipe serve as the inner box. Through thermal contact,
A second cold air duct on the back side of the cooling plate;
A heat insulating material is provided between the cooling plate and the inner box,
The refrigerator according to claim 1, wherein the cold air duct and the concave groove are accommodated within a thickness of the heat insulating material.   The said cooling plate has a hole part which connects the said 2nd cold air duct and the said refrigerator compartment, and blows off the cold air of the said 2nd cold air duct to the said refrigerator compartment from the said hole part. Refrigerator.   A cold air duct for supplying cold air sent from the cooler to the refrigerating chamber is provided on both sides of the rear surface of the refrigerating chamber, and the second cold air duct connects the cold air duct and the hole. The refrigerator according to claim 9.   11. The pipe according to claim 8, wherein the pipe is in thermal contact with a capillary tube constituting the refrigeration cycle, and the capillary tube is positioned at a position away from the concave groove. refrigerator.   12. A damper thermo is provided on a cool air passage for sending cool air from the cooler to the cool air duct, and supply of cool air to the refrigerating chamber is controlled by opening and closing the damper thermo. The refrigerator in any one of.   The refrigerator according to claim 9, wherein a plurality of holes are provided to blow out the cold air flowing through the second cold air duct toward the refrigerator compartment. The refrigerator according to claim 9, wherein an opening of the hole is smaller than a blow-out port that blows out cold air from the cold air duct to the refrigerator compartment.

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