JP4203662B2 - refrigerator - Google Patents

Description

  The present invention relates to cooling of a refrigerator compartment of a refrigerator.

Conventionally, this type of refrigerator generally has a refrigeration cycle by sequentially connecting a compressor, a throttle valve, and an evaporator, and circulating a refrigerant therethrough. And the refrigerator compartment is cooled with the evaporator of this refrigeration cycle, and there are a cooling method and a direct cooling method. The intercooling system is a system in which cold air cooled by an evaporator is supplied to a refrigerating chamber by a cooling fan and the cold air is circulated to cool the refrigerating chamber. On the other hand, the direct cooling method is a method in which the wall surface of the refrigerator compartment is cooled by an evaporator, and the refrigerator compartment is cooled by radiation cooling from the cooled wall surface. (For example, see Patent Document 1)
FIG. 7 shows a conventional refrigerator described in Patent Document 1. As shown in FIG. As shown in FIG. 7, the refrigerator 5 comprised by the heat insulation box 4 with which the heat insulating material 3 was filled between the inner box 1 and the outer box 2 is shown. The refrigerator 5 has a refrigerator compartment 6, a vegetable compartment 26, a first freezer compartment 7, and a second freezer compartment 8 from above, and a front door is an open / close door 9.

  The refrigerator compartment 6 and the vegetable compartment 26 are partitioned by a refrigerator compartment partition plate 27, respectively, and the vegetable compartment 26 and the first freezer compartment 7 are partitioned by a heat insulating partition wall 10 having the same configuration as the heat insulating box 4.

  Cooling pipes 28 (evaporators) are disposed on the upper, lower, left, and right wall surfaces that constitute the inner box 1 of the refrigerator compartment 6 and the vegetable compartment 26, and the interior is cooled by the cooling pipes 28. A plurality of cooling wall surfaces (ceiling, left and right, rear walls, etc.) are provided.

  A cooling fan 16 and a freezer compartment evaporator 17 are disposed in the second freezer compartment 8.

  FIG. 8 shows a refrigeration cycle, 28 shows a cooling pipe, 17 shows a freezer compartment evaporator, and the refrigerant discharged from the compressor 18 passes through the condenser 19 and the three-way valve 20 as shown by dotted lines. After that, a first refrigeration cycle is constructed in which the pressure is reduced by the first capillary tube 21, enters the cooling pipe 28 (evaporator), and returns to the compressor 18 again. Further, the refrigerant discharged from the compressor 18 passes through the condenser 19 as indicated by a solid line, the refrigerant flow dew is switched by the three-way valve 20, the pressure is reduced by the second capillary tube 22, and the refrigerant enters the freezer compartment evaporator 17, Again, a second refrigeration cycle returning to the compressor 18 is configured. The refrigerant is cooled by the latent heat of vaporization when passing through the cooling pipe 28 or the freezer evaporator 17, and the cooling pipe 28 cools the wall surface of the inner box 1.

  As shown in FIG. 7 again, a cold air duct 29 is disposed on the inner wall 1 of the rear wall that is the inside of the refrigerator compartment 6, and a cooling fan 15 for refrigeration is disposed above the cold air duct 29. ing.

  The operation and effect of the refrigerator configured as described above will be described below.

Due to the operation of the compressor 18, the refrigerant flows through the cooling pipe 28 or the freezer compartment evaporator 17, thereby cooling the inside of the warehouse. First, on the refrigerator compartment 6 side, the wall surface of the inner box 1 is directly cooled by the cooling pipe 28, and the upper, lower, left, and right, and the rear wall become the cooling wall surfaces. At this time, when the internal temperature is stable within the set range, the cooling fan 15 is stopped and cooling by the cooling wall surface is performed. Next, when food is put in and the internal temperature rises, the cooling fan 15 is operated, the cold air is circulated through the cold air duct 29 to cool the internal temperature, and the internal temperature is lowered. Further, after the cooling fan 15 is operated, when the inside of the refrigerator reaches the set temperature, the cooling fan 15 is stopped and the cooling returns to the cooling wall only. In the freezer compartment evaporator 17 in the second freezer compartment 8, the cooling fan 16 cools the air passing through the freezer compartment evaporator 17, and independent cooling in the first freezer compartment 7 and the second freezer compartment 8. Is possible.
JP 2000-28257 A

  However, in the configuration as described above, a loss occurs when the cooled cooling pipe conducts heat to the inner box, and only a cooling area limited to the inner box surface can be secured. There was a problem that the cooling capacity was insufficient when a large load was applied.

  Furthermore, in general, a room having a slightly lower temperature such as a partial freezing room or a chilled room is often provided in the lower part of the refrigeration room. Regarding the circulation of the chiller, it is generally designed to suck in from the lower part of the rear face of the refrigerator compartment and blow out from the upper part of the inner face or the top face after exchanging heat with the refrigerator in the refrigerator compartment. Therefore, since the low temperature chamber is far from the cold air outlet, it is difficult to maintain it at a low temperature, which makes it difficult to design and lowers the cooling efficiency.

  The present invention solves the above-mentioned problems, and by conducting a cooling fan appropriately, cooling is performed in a constant temperature and high humidity state suitable for food preservation, and even when a large load is applied, heat conduction from the cooling pipe to the cooling plate is achieved. The purpose of this is to provide a refrigerator that does not easily cause loss during operation and does not have the necessary cooling capacity. In addition, the lower low-temperature chamber is efficiently desired to form an air passage for upper suction and lower blowing. Can be cooled to the temperature of

  In addition, the condensed water on the cooling pipes and cooling plates can flow from top to bottom without stagnation, ensuring that water outflow into the cabinet is prevented and the refrigerator compartment evaporator is used with almost no water or frost. Realizes cooling without loss.

  In order to solve the above-described conventional problems, the refrigerator of the present invention is configured such that a cooling pipe is in thermal contact with an inner box constituting a refrigerator compartment and a flat plate-like cooling plate disposed along the rear wall of the inner box. A refrigerator compartment evaporator, a decorative board covering the refrigerator compartment evaporator, and a cooling fan are provided. The refrigerator compartment evaporator is installed between the inner box and the decorative board, and the refrigerator compartment evaporator and the decorative board are the same. It is made to incline back-and-forth, and it is made into the cool air circulation air path from the top to the bottom between an inner box and a refrigerator compartment evaporator, and a decorative board.

  As a result, a cooling fan can be appropriately operated to secure a cool air circulation air passage through which both the front and rear surfaces of the cold room evaporator pass the cool air, and the cooling area can be increased and the cool air circulation air volume can be increased. Since the container and the decorative plate are installed slightly tilted back and forth, the condensed water adhering to the surface of the cooling pipe and the cooling plate generated when cooling the internal air can be smoothly flowed.

  Further, the refrigerator of the present invention circulates cold air, a refrigerator compartment and a freezer compartment partitioned by a heat insulating partition, a flat refrigerator compartment evaporator at the back of the refrigerator compartment, a freezer compartment evaporator for cooling the freezer compartment, A cooling fan for refrigeration, a cooling fan for freezing, and a control means for varying the number of rotations of the compressor and the cooling fan based on the difference between each detected temperature and a set temperature, and appropriately operating the cooling fan for refrigeration. Since the air inside the refrigerator is sucked in from the upper part of the refrigerator compartment, cooled by the freezer evaporator, and then blown out from the lower part, it is easy to cool the cold room installed in the lower part of the refrigerator compartment. is there.

  The refrigerator of the present invention operates the cooling fan as appropriate so that when the internal temperature rises at the time of food addition or the like, the internal temperature can be rapidly lowered and condensed water attached to the refrigerator compartment evaporator can be discharged. Since it can flow toward the outlet without stagnation, it can be cooled efficiently, and it can prevent the outflow of condensed water into the cabinet and the wetness of food in the refrigerator.

  According to the first aspect of the present invention, the refrigerating chamber evaporation is formed by arranging a cooling pipe in thermal contact with an inner box constituting the inside of the refrigerating chamber and a flat cooling plate disposed along the rear wall of the inner box. A cooling plate and a decorative plate covering the refrigerator and the refrigerator compartment, and a cooling fan, installing the refrigerator compartment between the inner box and the decorative plate, tilting the refrigerator compartment evaporator and the decorative plate back and forth in the same direction, A cooling air circulation path from the top to the bottom can be secured between the inner box and the refrigerator evaporator and the decorative board, the cooling area can be expanded and the cooling air circulation volume can be increased. When it rises, the inside temperature can be lowered rapidly.

  Furthermore, the cooling fan for refrigeration is operated appropriately, the air inside the refrigerator is sucked from the upper part of the refrigeration room, cooled by the freezer evaporator, and then blown out from the lower part. It is possible to cool it.

  In addition, because the refrigerator compartment evaporator is slightly inclined in the front-rear direction, water does not collect easily in the heat contact area between the cooling pipe and the cooling plate, maintaining high heat exchange performance, and repeated freezing and thawing over many years. This prevents the cooling pipe and the cooling plate from peeling off.

  According to a second aspect of the present invention, in the first aspect of the present invention, the position surface of the cooling pipe of the refrigerator compartment evaporator is a lower inclined surface, and the heat exchange efficiency of the refrigerator compartment evaporator is further increased. It can be improved.

  According to a third aspect of the present invention, in the second aspect of the present invention, the cooling pipe has a cross-sectional shape that is a cross-sectional shape, and a part of the pipe in the circumferential direction is a flat part, and the flat part is a cooling plate. The amount of condensed water that accumulates at the contact portion is increased because the contact angle between the contact surfaces of the cooling pipe and the cooling plate increases, as well as improving the efficiency of heat exchange between the cooling pipe and the cooling plate. The heat exchange efficiency of the refrigerator compartment evaporator can be further improved.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, the cooling pipe arrangement pattern is bent in a horizontal U-shape and the straight pipes extending from the R portion are fanned out. Condensed water adhering to the cooling pipe and the cooling plate flows downward through the contact portion between the cooling pipe and the cooling plate by gravity, and is surely guided to the discharge port.

  According to a fifth aspect of the present invention, in the second aspect of the invention, a plurality of cut-and-raised portions obtained by cutting a part of the cooling plate are mechanically wound around and fixed to the cooling pipe. Even if condensed water enters the gap between the cooling pipe and the cooling plate and freezes and thaws repeatedly, the cooling pipe does not fall off the cooling plate and the minimum heat exchange can be maintained, so the refrigerator compartment does not cool. This is to prevent the worst situation.

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

(Embodiment 1)
FIG. 1 shows a cross-sectional view of the refrigerator according to Embodiment 1 of the present invention. FIG. 2 is a refrigeration cycle diagram according to Embodiment 1 of the present invention.

  In FIG. 1, the refrigerator 5 comprised by the heat insulation box 4 with which the heat insulating material 3 was filled between the inner box 1 and the outer box 2 is shown. The refrigerator 5 has a refrigerator compartment 6, a first freezer compartment 7, and a second freezer compartment 8 from above, and a front door is an open / close door 9. The refrigerator compartment 6 and the first freezer compartment 7 are partitioned by a heat insulating partition wall 10 having the same configuration as that of the heat insulating box 4.

  The shape of the inner box 1 of the refrigerator compartment 6 is slightly inclined so that the top is in front when viewed from the door side. The refrigerator compartment evaporator 11 is inclined and arranged substantially parallel to the shape of the inner box 1, and the refrigerator compartment evaporator 11 is configured such that the cooling pipe 13 is in thermal contact with a flat plate-like cooling plate 12. .

  Further, an inclined decorative plate 14 is disposed inside the refrigerator so as to cover the refrigerator compartment evaporator 11, and between the refrigerator compartment evaporator 11 and the decorative plate 14, and between the refrigerator compartment evaporator 11 and the inner box 1, that is, the refrigerator compartment. Spaces are provided on the front and rear surfaces of the evaporator 11, and a cold air circulation air passage for exchanging heat from the cold air returning from the refrigerator compartment 6 is provided.

  Further, it has a cold room cooling fan 15 for flowing cold air above the cold air circulation path, sucks air in the cold room through an opening 24 a above the cold room, and cools the cold air downward along the cold room evaporator 11. Is circulated, and heat is exchanged from the cold air discharge port 24b below the decorative plate 14 to discharge the cooled cold air. In addition, the structure of the refrigerator compartment evaporator 11 is not restricted to the said structure, A thing like a roll bond may be used.

  In the second freezer compartment 7, a freezer compartment cooling fan 16 and a freezer compartment evaporator 17 are arranged.

  FIG. 2 shows a refrigeration cycle. The refrigerant discharged from the compressor 18 passes through the condenser 19 and the three-way valve 20, is then decompressed by the first capillary tube 21, and is evaporated by the refrigerator compartment evaporator 11. A first refrigeration cycle is then returned to the compressor 18 again. The refrigerant discharged from the compressor 18 passes through the condenser 19, the refrigerant flow is switched by the three-way valve 20, is decompressed by the second capillary tube 22, enters the freezer compartment evaporator 17, and again enters the compressor 18. A second refrigeration cycle returning to is configured.

  In addition, as shown in FIG. 3, there is also a method in which the refrigerator compartment evaporator 11 is constituted by a tube-on-sheet in which a cooling pipe 13 is crimped to a flat cooling plate 12 and the cooling pipe 13 is installed on the inner box side.

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

  First, when the compressor 18 is operated, the refrigerant flows into the refrigerator compartment evaporator 11 or the freezer compartment evaporator 17 so that the inside of the refrigerator is cooled. That is, during the first refrigeration cycle, on the refrigerator compartment 6 side, the refrigerator compartment evaporator 11 serves as a cooling surface, and the refrigerator compartment fan 15 is operated to generate heat when passing through the refrigerator compartment evaporator 11. The replaced cold air is discharged into the refrigerator compartment 6 to cool the refrigerator compartment 6. The refrigerator cooling fan 15 is operated until the set temperature is reached during the first refrigeration cycle. On the other hand, on the side of the freezer compartment evaporator 17, cold air circulates in the refrigerator by the freezer compartment cooling fan 16, and the first freezer compartment 7 and the second freezer compartment 8 are cooled. The freezer compartment cooling fan 16 is operated until the set temperature is reached during the second refrigeration cycle.

  Thus, since the refrigerator of this Embodiment 1 allows cold air to pass through both the front and rear surfaces of the refrigerator compartment evaporator 11, a cold air circulation air passage that allows cold air to pass through both the front and rear surfaces of the refrigerator compartment evaporator 11 is ensured. In addition, the cooling area can be increased and the amount of cool air circulating air can be increased. When the internal temperature rises when food is added, the internal temperature can be lowered rapidly.

  And since the cooling pipe 13 is arrange | positioned at the lower surface 12a of the inclined cooling plate 12, the dew condensation water 26 adhering at the time of heat exchange with air does not collect easily in the junction part 12b of the cooling pipe 13 and the cooling plate 12. The amount can be minimized.

  Moreover, since the cooling air circulation path from the top to the bottom is used, the attached condensed water 26 can be smoothly guided from the top to the bottom to the drain outlet.

  Furthermore, it is equipped with the inner box 1, the refrigerator compartment evaporator 11 arrange | positioned along the rear wall of the inner box 1, and the decorative board 14 which covers the refrigerator compartment evaporator 11, and is stored in the refrigerator compartment from the opening part 24a above the refrigerator compartment. The inside air is sucked in, the cold air is circulated downward along the refrigerator compartment evaporator 11, and heat is exchanged from the cold air discharge port below the decorative plate 14 to discharge the cooled cold air. It is possible to easily change the air volume distribution of the cold air to be discharged, for example.

  For this reason, the low temperature chamber installed in the lower part of the refrigerator compartment can be cooled very efficiently only by providing a small cold air outlet 24b. In addition, the refrigerator compartment evaporator 11 is constituted by a cross section of the cooling pipe 13 having a cross section of the cooling pipe 13 and a flat surface portion thereof being in close contact with the cooling plate 12, and the cooling pipe 13 is installed below the inclined surface 12a. As a result, the surface area of the refrigerator compartment evaporator 11 is secured, and the condensed water 26 adhering to the cooling pipe 13 and the cooling plate 12 is surely drained, and the condensation in the refrigerator compartment evaporator 11 is ensured. However, the refrigerator compartment evaporator 11 can be made compact.

(Embodiment 2)
FIG. 5 shows an evaporator 11 according to Embodiment 2 of the present invention.

  In FIG. 5, a cooling fan 15 for circulating the cool air in the decorative plate 14, the inner box 1, and the refrigerator compartment 6 is provided, and the arrangement pattern of the cooling pipes is bent in a horizontal U shape and extended from the R portion. The straight pipe is fan-shaped and arranged to form a circulation air path for cold air from the top to the bottom. Since the operation of the refrigeration cycle is the same as that of the first embodiment, the description is omitted.

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

  The cold room cooling fan 15 operates during the first refrigeration cycle, passes through the cold air circulation air passage between the decorative plate 14 and the inner box 1, and passes through both the front and rear sides of the cold room evaporator 11. Are exchanged in heat and discharged into the refrigerator compartment 6 to cool the refrigerator compartment 6.

  By installing the cooling pipe 13 of the refrigerator compartment evaporator 11 below the inclined surface 12a, the surface area of the refrigerator compartment evaporator 11 is ensured, and the condensed water adhering to the cooling pipe and the cooling plate is caused by gravity by the cooling pipe. Therefore, the effect of the first to third aspects of the present invention is further improved.

  Therefore, the arrangement pattern of the cooling pipes is bent in a horizontal U-shape, and both straight pipes 13a and 13b extending from the R portion are fanned out, and the dew condensation adhering to the cooling pipe 13 and the cooling plate 12 is arranged. The water is surely drained without stagnation, and the refrigerator compartment evaporator 11 can be made compact while ensuring the condensation in the refrigerator compartment evaporator 11.

(Embodiment 3)
FIG. 6 shows a cross-sectional view of the refrigerator in the third embodiment of the present invention.
A plurality of cut-and-raised portions 25 obtained by cutting a part of the cooling plate are mechanically wound around the cooling pipe 13 and fixed.

  The operation and action of the refrigerator configured as described above will be described below.

  In FIG. 6, in addition to obtaining the effects described in the first and second embodiments, if dew condensation water enters the gap between the cooling pipe and the cooling plate 12 and freezes and thaws repeatedly, the volume is reduced during normal freezing. Due to the increase, the phenomenon of gradually separating the thermal contact between the cooling pipe 13 and the cooling plate 12 may occur over many years, and there is a risk that the cooling pipe 13 may be peeled off and dropped off.

  For this reason, the plurality of cut-and-raised portions 25 obtained by cutting a part of the cooling plate are mechanically wound around and fixed to the cooling pipe 13, so that the cooling pipe 13 does not fall off the cooling plate 12 and It can prevent the worst situation that the cold room does not get cold because it can maintain the limited heat exchange.

  As described above, in the refrigerator according to the present invention, a cooling fan can be appropriately operated to secure a cold air circulation air passage through which cold air passes through both the front surface and the rear surface of the refrigerator compartment evaporator. When the internal temperature rises when food is added, etc., the internal temperature can be lowered rapidly, and the condensed water adhering to the surface of the cooling plate or cooling pipe during heat exchange can be reduced. It is a structure that guides to the lower drainage port, it can always exchange heat at the best condition, and can ensure the cooling performance for use over many years. This technology can be used as a cooling method for refrigeration equipment in general.

Sectional drawing of the refrigerator in Embodiment 1 of this invention Refrigeration cycle diagram in Embodiment 1 of the present invention Sectional drawing of the refrigerator compartment evaporator in Embodiment 1 of this invention The enlarged view of the refrigerator compartment evaporator in Embodiment 1 of this invention The top view of the evaporator in Embodiment 2 of this invention The top view of the evaporator in Embodiment 3 of this invention Cross-sectional view of a conventional refrigerator Refrigeration cycle diagram of a conventional refrigerator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner box 6 Refrigerating room 10 Heat insulation partition wall 11 Refrigerating room evaporator 12 Cooling plate 13 Cooling pipe 14 Decorative plate 15 Refrigerating room cooling fan 16 Freezing room cooling fan 17 Freezing room evaporator 23 Fin 24a Opening 24b Cold air outlet 25 Cutting Raising part 26 condensed water

Claims (5)

Refrigerating room evaporator comprising a cooling pipe disposed in thermal contact with a flat cooling plate arranged along the rear wall of the inner box and the inner box constituting the inside of the refrigerator compartment and a makeup covering the refrigerator compartment evaporator Plate and a refrigerator cooling fan, a refrigerator compartment evaporator is installed between the inner box and the decorative plate, the refrigerator compartment evaporator and the decorative plate are inclined forward and backward in the same direction, the inner box and refrigerator compartment evaporator A refrigerator with a cold air circulation path from top to bottom between the wall and the decorative board. The refrigerator according to claim 1, wherein a position surface of a cooling pipe of the refrigerator compartment evaporator is a bottom surface inclined forward and backward. The refrigerator according to claim 2, wherein the cross-sectional shape of the cooling pipe is formed as a cross-sectional shape of the cooling pipe, a part of the pipe in the circumferential direction is a flat part, and the flat part is closely attached to the cooling plate. 3. The refrigerator according to claim 2, wherein the cooling pipe arrangement pattern is bent in a horizontal U shape and both straight pipes extending from the R portion are fanned out. The refrigerator according to claim 2, wherein a plurality of cut and raised portions obtained by cutting and raising a part of the cooling plate are mechanically wound around and fixed to the cooling pipe.

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