JP2018004248A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator capable of improving performance of a condenser.SOLUTION: A condenser includes a radiation pipe 22B arranged coming into contact with at least one part of an outer box 12, arranged so as to extend vertically along right and left side plates and be folded back at an upper end part and a lower end part of the outer box 12, and arranged in the longitudinal direction along an upper plate 12a of the outer box 12. The radiation pipe 22B has: cylindrical shape parts 22d-22g in a cross-sectional view; and flat cylindrical shape parts 22a-22c in a cross-sectional view. The cylindrical shape parts 22d-22g are applied to a region in which the radiation pipe 22B is folded and arranged and a region extending in the longitudinal direction. The flat cylindrical shape parts 22a-22c are applied to a region in which the refrigerant pipe 22B is arranged straight vertically, and flat surfaces of the flat cylindrical shape parts 22a-22c come into contact with the outer box 12.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a refrigerator having a refrigerant condenser structure that radiates heat from a casing.

  In recent years, environmental awareness has spread widely, and home appliances with high energy-saving performance aimed at reducing carbon dioxide emissions have been demanded. Therefore, in the refrigerator, there is a demand for product development that has higher energy saving performance and is made of less material and has less environmental impact.

  One way to improve energy saving performance is to review the refrigeration cycle. The technique of lowering the refrigerant temperature by bringing the condenser into close contact with the steel plate covering the outside of the refrigerator casing and releasing the heat is widely known, and is actually used in refrigerators.

  It is also known that reducing the refrigerant temperature as much as possible before moving from the condenser to the evaporator contributes to performance improvement. For example, a technique has been proposed in which the refrigerant pipe of the condenser is a flat pipe, and the flat surface of the flat pipe is brought into close contact with the steel plate to improve the heat dissipation performance (see Patent Document 1).

JP 2001-165545 A

  However, in the technique described in Patent Document 1, if the entire refrigerant pipe of the condenser is a flat pipe, the flat pipe is crushed in a region where the refrigerant pipe is bent and disposed, and the flow resistance of the flat pipe increases, and the condenser There is a problem that the performance of the.

  This invention solves the said conventional problem, and aims at providing the refrigerator which can improve the performance of a condenser.

  The refrigerator of the present invention includes a compressor that compresses the refrigerant, a condenser that condenses the refrigerant compressed by the compressor, a decompression device that decompresses the refrigerant condensed by the condenser, and a decompression device that decompresses the refrigerant. An evaporator that evaporates the refrigerant, and a refrigeration cycle unit that is connected in order, and a box that houses the refrigeration cycle unit, and the box includes an outer box that forms an outer shell, and the condensation The container is disposed in contact with at least a part of the outer box, extends in the vertical direction along the left and right side plates of the outer box, and is disposed so as to be folded at the upper end and the lower end. A refrigerant pipe arranged in the left-right direction along the plate, the refrigerant pipe having a circular cylindrical shape section in cross section and a flat cylindrical shape section flat in cross section; Applies to areas where tubes are bent and extended in the left-right direction Is, the flat cylindrical shape portion is applied to the area to straight arrangement of the refrigerant pipes in the vertical direction, and wherein the flat surface of the flat cylindrical shape portion is in contact with the outer box.

  ADVANTAGE OF THE INVENTION According to this invention, the refrigerator which can improve the performance of a condenser can be provided.

It is an appearance perspective view showing a refrigerator concerning an embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is a perspective view which shows the back side of a refrigerator. It is a block diagram which shows a refrigerating cycle part. It is a layout drawing of a heat radiating pipe. It is the schematic explaining the processing method of a thermal radiation pipe. It is a schematic plan view which shows arrangement | positioning etc. of a thermal radiation pipe. FIG. 6 is a cross-sectional view taken along line B-B in FIG. 5. (A) is sectional drawing which shows the heat radiating pipe of the area | region arrange | positioned by bending, (b) is sectional drawing of the heat radiating pipe of the area | region arrange | positioned straightly. The gradual deformation part of a thermal radiation pipe is shown, (a) is a side view, (b) is a top view.

  Hereinafter, the refrigerator according to the embodiment of the present invention will be described in detail. In the following description, the 6-door type will be described as an example, but the invention may be applied to refrigerators having other door numbers such as 5 doors or less.

FIG. 1 is an external perspective view showing a refrigerator according to an embodiment of the present invention.
As shown in FIG. 1, the refrigerator 1 includes a refrigerator compartment 2, an ice making compartment 3, an upper freezer compartment 4, a lower freezer compartment 5, and a vegetable compartment 6.

  The refrigerator compartment 2 is provided with doors 2a and 2b that are divided into left and right sides. The doors 2a and 2b are rotatably supported by the heat insulating box 10 via door hinges (not shown) provided on the heat insulating box 10 (box). The ice making room 3, the upper freezing room 4, the lower freezing room 5, and the vegetable room 6 are provided with drawer-type doors 3a, 4a, 5a, 6a, respectively.

FIG. 2 is a cross-sectional view taken along line AA in FIG.
As shown in FIG. 2, the refrigerator 1 includes a heat insulating box 10 configured by filling a foam heat insulating material U therein. The heat insulating box 10 includes an upper surface wall 10a positioned on the upper surface, side walls 10b and 10c (refer to FIG. 1) positioned on the left and right side surfaces, a rear wall (rear wall) 10d positioned on the back surface, and a bottom wall 10e positioned on the bottom surface. It has. Each wall 10a, 10b, 10c, 10d, 10e functions as a heat insulating wall that insulates the inside and the outside of the refrigerator 1 from heat.

  The heat insulation box 10 is provided between the refrigerating chamber 2, the ice making chamber 3 and the upper freezing chamber 4 (see FIG. 1), the refrigerating temperature zone refrigerating chamber 2, the refrigerating temperature zone ice making chamber 3 and the upper freezing chamber. 4 (see FIG. 1) is provided with a heat insulating partition wall 11a. Moreover, the heat insulation box 10 insulates between the lower freezer compartment 5 and the vegetable compartment 6 between the lower freezer compartment 5 in the freezing temperature zone and the vegetable compartment 6 in the storage temperature zone higher than the freezing temperature zone. A partition wall 11b is provided. The heat insulation box 10 includes the ice making room 3, the upper freezing room 4 (see FIG. 1), and the lower freezing room 5 in the same freezing temperature zone, and includes a partition wall 11c that is not a partition heat insulating wall but a mere partition. ing.

  Further, the heat insulating box 10 includes an outer box 12 forming an outer shell, and various storages for storing food in the refrigerator compartment 2, the ice making chamber 3, the upper freezer compartment 4 (see FIG. 1), the lower freezer compartment 5, the vegetable compartment 6, and the like. And an inner box 13 constituting the chamber. The heat insulation box 10 is configured by foaming and filling a foam insulation material U made of foamed urethane (hard urethane foam) in a filling space between the outer box 12 and the inner box 13.

  The outer box 12 includes an upper plate 12a corresponding to the upper surface, a right plate 12b corresponding to the right side surface (see FIG. 3), a left side plate 12c corresponding to the left side surface (see FIG. 3), a back plate 12d corresponding to the rear surface, and a bottom surface. Has a bottom plate 12e. The right side plate 12b, the left side plate 12c, the back plate 12d, and the bottom plate 12e are made of a thin iron plate (steel plate) having a thickness of about 0.3 to 0.5 mm. Hereinafter, the right side plate 12b and the left side plate 12c are abbreviated as side plates 12b and 12c.

  The inner box 13 is made of, for example, a synthetic resin (ABS resin or the like), and is configured such that a filling space in which the foam heat insulating material U is filled is formed by the inner box 13 and the outer box 12. Yes. In this embodiment, the upper plate 12a and the side plates 12b and 12c (see FIG. 3) correspond to a part of the outer box 12.

  The ice making room 3, the lower freezing room 5, and the vegetable room 6 are provided with storage containers 3b, 5b, 6b integrally with the doors 3a, 5a, 6a, and by pulling the doors 3a, 5a, 6a to the front side. The storage containers 3b, 5b, 6b can be pulled out. In the upper freezer compartment 4 (see FIG. 1), a storage container is provided integrally with the door 4a (see FIG. 1). In addition, the doors 3a, 4a, 5a, and 6a are in close contact with the front surface of the heat insulating box 10 to ensure the airtightness of the ice making room 3, the upper freezing room 4 (see FIG. 1), the lower freezing room 5, and the vegetable room 6. A packing (not shown) is provided.

  The refrigerator 1 also includes a cooler storage chamber 14. A cooler (evaporator) 15 and an internal cold air circulation fan 16 are disposed in the cooler storage chamber 14.

  The cooler 15 constitutes a part of the refrigeration cycle unit 20 (see FIG. 4), and is provided at a substantially back portion of the lower freezer compartment 5.

  The internal cold air circulation fan 16 is disposed above the cooler 15 in the cooler housing chamber 14, and cool air generated by heat exchange in the cooler 15 is transferred to the refrigerating chamber 2, the ice making chamber 3, and the upper freezer chamber 4 (FIG. 1), and is sent to the lower freezer compartment 5. Note that the refrigerator compartment 2, the ice making compartment 3, the upper freezer compartment 4 (see FIG. 1), the lower freezer compartment 5 and the vegetable compartment 6 are, for example, dampers (not shown) based on detection values of a temperature sensor (not shown). Each is cooled to a set temperature by opening and closing.

  The temperature in the cabinet is controlled by a control board (not shown) housed in the upper surface wall 10a of the heat insulating box 10. The control board includes a CPU (Central Processing Unit), a memory, an interface circuit, and the like, and executes control of the refrigeration cycle unit 20 and the blower system according to a control program stored in the memory (ROM).

FIG. 3 is a perspective view showing the back side of the refrigerator. In FIG. 3, a method for foaming and filling urethane foam into the heat insulating box 10 will be described.
As shown in FIG. 3, a plurality of urethane inlets 12 d 1, 12 d 1, 12 d 2, and 12 d 2 are formed on the back plate 12 d of the heat insulating box 10. The urethane inlet 12d1 is located in the upper part of the back plate 12d, and the urethane inlet 12d2 is located in the lower part of the back plate 12d.

  In the state where the heat insulating box 10 is laid so that the back plate 12d faces upward, the urethane foam stock solution is supplied from each urethane inlet 12d1, 12d2 to the filling space between the outer box 12 and the inner box 13 (see FIG. 2). (Foam insulation stock solution) is injected. The injected urethane foam undiluted solution wraps around the entire heat insulating space between the outer box 12 and the inner box 13 of the heat insulating box 10, and after the injection is completed, foaming is started and filled.

FIG. 4 is a block diagram showing the refrigeration cycle section.
As shown in FIG. 4, the refrigeration cycle unit 20 includes, for example, a compressor 21, a condenser 22, a capillary tube 23, and a cooler 15, and the compressor 21, the condenser 22, the capillary tube 23, and a cooler are included. The refrigerant is configured to circulate in the order of 15. A part of the compressor 21 and the condenser 22 is provided in a machine room 17 (see FIG. 2) provided at the lower back of the heat insulating box 10.

  The condenser 22 includes a machine room condenser 22A disposed in the machine room 17 (see FIG. 2), and includes a heat radiation pipe 22B and a dew condensation prevention pipe 22C. The machine room condenser 22A is, for example, a cooling pipe attached to a copper pipe. The dew condensation prevention pipe 22C prevents the dew generated at the boundary between the interior and the outside air, and is disposed at, for example, the front ends of the heat insulating partition walls 11a and 11b and the partition wall 11c (FIG. 2). reference).

  That is, the high-temperature and high-pressure gas refrigerant discharged from the compressor 21 is cooled by passing through the condenser 22 and promotes liquefaction. The liquefied refrigerant is decompressed by passing through the capillary tube 23 to become a gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant evaporates through the cooler 15 to cool the air passing through the inside of the warehouse, and returns to the compressor 21 as a low-temperature and low-pressure gas refrigerant.

  For example, isobutane (R600a) is used as the refrigerant. In addition, although other refrigerants may be used as the refrigerant, isobutane is preferably used as the refrigerant because isobutane does not destroy the ozone layer when discarded and has a low global warming potential. .

  FIG. 5 is a layout diagram of the heat radiating pipe. Although illustration of a part of the side plate 12c is omitted in FIG. 5, the side plate 12c is configured to be bilaterally symmetric with the side plate 12c, and therefore description of the arrangement of the heat radiating pipes 22B on the side plate 12c side. Is omitted.

  A heat radiating pipe 22B functioning as a condenser 22 is attached to the inner surface of the outer box 12 (upper plate 12a, side plates 12b, 12c). In other words, the heat radiating pipe 22B extends in the left-right direction along the upper plate 12a, extends in the vertical direction along the side plates 12b, 12c, and is arranged so as to be folded back at the upper end portion and the lower end portion.

  The heat radiating pipe 22B has flat cylindrical portions 22a, 22b, and 22c that are flat in cross section in regions R1, R2, and R3 in which the heat radiating pipe 22B is arranged straight. Further, the heat radiating pipe 22B has cylindrical portions 22d, 22e, 22f, and 22g that are circular in cross section in regions R4, R5, R6, and R7 where the heat radiating pipe 22B is bent.

  The end 22f2 on the side plate 12b side of the heat radiating pipe 22B is connected to the machine room condenser 22A, and the end (not shown) on the side plate 12c side is connected to the condensation prevention pipe 22C. Note that the end 22f2 on the side plate 12b side of the heat radiating pipe 22B may be connected to the condensation prevention pipe 22C, and the end on the side plate 12c side may be connected to the machine room condenser 22A.

  Thus, by arranging the heat radiating pipe 22B to be folded up and down (upper end and lower end) (regions R1 to R3), the heat radiating pipe 22B is flatter than when folded back and forth (front end and rear end). Since the portions of the cylindrical portions 22a to 22c can be secured for a long time, the performance as the condenser 22 can be further enhanced.

  By the way, in order to achieve the purpose of improving the cooling performance of the condenser 22 (see FIG. 4), it is most desirable that the entire heat radiating pipe 22B is formed into flat cylindrical portions 22a to 22c. However, it is desirable that the connection portions with other parts located at both ends of the heat radiating pipe 22B be cylindrical, and the heat radiating pipe 22B may be crushed in the regions R4 to R7 where the heat radiating pipe 22B is bent. Therefore, it is desirable to use the cylindrical portions 22d to 22g. Therefore, as for the heat radiating pipe 22B, it is desirable to appropriately select the flat cylindrical portions 22a to 22c and the cylindrical portions 22d to 22g according to the bending state of the pipe.

  In the present embodiment, the case where the heat radiating pipe 22B is provided on the upper plate 12a and the side plates 12b and 12c has been described as an example. However, the present invention is not limited to such an arrangement, and the upper plate 12a and the side plate are provided. In addition to 12b and 12c, it may be applied to the back plate 12d and the bottom plate 12e of the bottom wall 10e (see FIG. 2).

  Further, in the present embodiment, the case where the region is divided into the regions R1 to R7 in FIG. 5 has been described as an example. However, the present invention is not limited to this. For example, the cylindrical portions of R4, R5, and R7 are flattened. A cylindrical portion may be provided to further divide the region.

  Moreover, since the iron plate for adsorbing the magnet built in packing is arrange | positioned in the front surface of the heat insulation partition walls 11a and 11b and the partition wall 11c, the flat cylinder shape part of a cross sectional view is flat on the dew condensation prevention pipe 22C. By applying, the flat surface (flat portion) of the flat cylindrical portion may be in contact with the iron plate.

FIG. 6 is a schematic diagram for explaining a method for processing a heat radiating pipe.
As shown in FIG. 6, the processing device (manufacturing device) for the heat radiating pipe 22B is made of a copper pipe 31 wound in a coil shape on a bobbin (not shown), and the pipe 31 is pressed into a flat shape in sectional view. And a press device 32. The pressing device 32 includes a jig 32a for pressing the pipe 31 to flatten the pipe 31 in cross-sectional view.

  In such a processing apparatus, the jig 32a of the press apparatus 32 is moved in the Z1 direction or the Z2 direction while the pipe 31 is extended in the X direction. That is, when the jig 32a is operated in the Z1 direction and pressed against the pipe 31, the pipe 31 becomes the heat radiating pipe 22B having the flat cylindrical portion F. Moreover, by operating the jig 32a in the Z2 direction and not pressing the pipe 31, the heat radiating pipe 22B having the cylindrical portion C in a state where the pipe 31 is simply stretched is obtained.

  Further, in the case where the flat cylindrical portion F is formed, the heat radiating pipe 22B having the gradually deformed portion S1 is configured by operating the jig 32a from the Z1 direction to the Z2 direction while extending the pipe 31. In the case where the cylindrical portion C is formed, the heat radiating pipe 22B having the gradually deformed portion S2 is configured by operating the jig 32a from the Z2 direction to the Z1 direction while extending the pipe 31.

  By the way, as a means for improving the performance of the condenser, it is known as an alternative technique to increase the flow velocity of the refrigerant by reducing the diameter of the refrigerant pipe (heat radiating pipe). However, if the refrigerant pipe is narrowed, it is necessary to lengthen the pipe length in order to compensate for the decrease in the internal volume of the refrigerant in the refrigeration cycle section 20, and a large facility modification is required. In addition, a large amount of copper material used for the refrigerant piping is consumed, and a large amount of aluminum tape 24 attached from the top of the condenser for the purpose of expanding the heat radiation area is also consumed. Increase.

  However, by processing the heat radiating pipe 22B by the method shown in FIG. 6, the heat radiating pipe 22B in which the flat cylindrical portion F and the cylindrical portion C are alternately formed only by adding the press device 32 to the conventional manufacturing equipment. As a result, it is not necessary to significantly modify the equipment.

  In addition, by processing the cylindrical pipe 31 into a flat cylindrical portion, a general-purpose pipe 31 can be used, and the manufacturing cost can be suppressed compared to purchasing a flat custom-made pipe. . Moreover, since a cylindrical thing is processed into a flat shape instead of processing a flat cylindrical thing into a cylindrical shape, a process becomes easy.

FIG. 7 is a schematic plan view showing the arrangement and the like of the heat radiating pipe.
As shown in FIG. 7, in the outer box 12, a heat radiating pipe 22 </ b> B, in which flat cylindrical portions 22 a to 22 c and cylindrical portions 22 d to 22 g are alternately processed, is disposed on one flat steel plate. Then, for example, an aluminum tape 24 is attached from above the heat radiating pipe 22B, and the heat radiating pipe 22B is fixed to the inner surface of the outer box 12 (upper plate 12a, side plates 12b, 12c). The tape 24 may be attached to the area excluding the bent portion (see FIG. 7), but may be attached to the entire heat radiating pipe 22B.

  And the vacuum heat insulating material 25 is laminated | stacked on the heat radiating pipe 22B fixed with the tape 24. FIG. The vacuum heat insulating material 25 has a rectangular shape in plan view that can cover the flat cylindrical portions 22a to 22c of the heat radiating pipe 22B arranged on the side plate 12b. The vacuum heat insulating material 25 is a heat insulating material having a lower thermal conductivity than the foamed heat insulating material U such as urethane, and has a core material such as glass wool and a gas barrier outer covering material covering the core material, It is configured by sealing the inside under reduced pressure.

  In the outer box 12 in which the heat radiating pipe 22B is fixed by the tape 24 and the vacuum heat insulating material 25 is fixed, a bending jig is provided at a portion corresponding to the boundary between the upper plate 12a and the side plates 12 and 12c. 7 is folded perpendicularly to the front side in the vertical direction with respect to the paper surface of FIG.

8 is a cross-sectional view taken along line BB in FIG. In addition, in FIG. 8, the cross section of the state which added the vacuum heat insulating material 25 is shown. Further, in FIG. 8, for convenience of explanation, the heat radiating pipe 22 </ b> B (22 a to 22 c) and the tape 24 are intentionally separated from each other.
As shown in FIG. 8, the vacuum heat insulating material 25 is temporarily fixed to the side plate 12 b side in advance by hot melt, a sealing material, or the like, and is fixed inside the heat insulating box 10 by filling the foam heat insulating material U by foaming.

  The vacuum heat insulating material 25 is formed with a concave groove 25a at a position corresponding to the heat radiating pipe 22B (flat cylindrical portions 22a to 22c). The groove 25a is formed between the heat radiating pipe 22B and the vacuum heat insulating material 25 when the vacuum heat insulating material 25 is placed on the heat radiating pipe 22B so that the heat radiating pipe 22B (22a to 22c) does not contact the vacuum heat insulating material 25. It is configured to have a gap P between them. Moreover, the vacuum heat insulating material 25 is provided in the position corresponding to the flat cylindrical shape parts 22a-22b (refer FIG. 7).

  Thus, by forming the groove 25a arranged in the vacuum heat insulating material 25 via the heat radiation pipe 22B (22a to 22c) and the gap P, in other words, the groove in the vacuum heat insulating material 25 so as to escape from the heat radiation pipe 22B. 25a is formed. As a result, the heat of the refrigerant passing through the refrigerant pipe 22B is transmitted to the interior (the refrigerator compartment 2, the ice making compartment 3, the upper freezer compartment 4, the lower freezer compartment 5, and the vegetable compartment 6) through the vacuum heat insulating material 25. Can be suppressed. Therefore, it can suppress that the cooling efficiency in a warehouse falls. Further, by arranging the flat cylindrical portions 22a to 22c of the heat radiating pipe 22B in the groove 25a, the depth of the groove 25a can be formed shallow, so that the layer of the vacuum heat insulating material 25 can be thickened and the heat insulating performance can be improved. It becomes possible to improve.

  In FIG. 8, the case where the groove 25a has a concave shape long in the front-rear direction has been described as an example. However, as long as the groove 25a has a shape that escapes the heat radiating pipe 22B, the shape is limited to the shape shown in FIG. Instead, it can be changed as appropriate.

FIG. 9A is a cross-sectional view showing the heat dissipating pipe in the bent region, and FIG. 9B is a cross-sectional view of the heat dissipating pipe in the straight region.
As shown in FIG. 9A, the flat cylindrical portions 22a, 22b, and 22c have an oval shape (rounded rectangle, track shape) in a cross-sectional view in section, and have, for example, straight lines having two parallel lengths. It is a shape composed of planes m and m (flat portions) and curved surfaces n and n having two semicircular curves. Moreover, as for flat cylinder shape part 22a, 22b, 22c, one plane m is contacting the side plate 12b surface-to-surface.

  As described above, the flat cylindrical portions 22a, 22b, and 22c are in line-of-sight contact with the side plate 12b, so that the contact area with the outer casing 12 made of a steel plate that functions as a heat sink can be reduced. This can be increased as compared with the case where the box 12 is brought into contact with the cross-sectional viewpoint, so that the cooling performance is enhanced and the performance as the condenser 22 can be improved. Moreover, since the heat radiating pipe 22B has the flat cylindrical shape portions 22a, 22b, and 22c and the plane m is in contact with the side plate 12b, the distance from the side plate 12b of the flow path through which the refrigerant passes can be shortened. Since it can be made to flow close to the side plate 12b functioning as a plate, the cooling performance of the refrigerant can be enhanced also in this respect, and the performance as the condenser 22 can be improved.

  As shown in FIG. 9B, the cylindrical portions 22d, 22e, 22f, and 22g are circular in a cross-sectional view in section. For example, the cylindrical portions 22d to 22g desirably have an outer diameter of about 3.0 to 5.0 mm. A region R4 (see FIG. 5) having a bent portion 22d1 (see FIG. 5) in which the cylindrical portions 22d to 22g are arranged by bending the heat radiating pipe 22B, and a region R5 (see FIG. 5) having a bent portion 22e1 (see FIG. 5). 5), a region R6 (see FIG. 5) having a bent portion 22f1 (see FIG. 5), and a region R7 (see FIG. 5) having a bent portion 22g1 (see FIG. 5). Accordingly, it is possible to prevent the disadvantage that the pipe is crushed during the bending process shown in FIGS. 5 and 6 and the flow path resistance of the refrigerant is increased.

  Moreover, it is desirable to set the dimension H (refer FIG. 9A) between the planes m which the flat cylindrical shape parts 22a-22c oppose to 1.6 mm or more and 2.2 mm or less. When the dimension H is 1.6 mm or less, the flow path resistance of the refrigerant increases and the cooling efficiency of the refrigerant decreases. When the dimension H is 2.2 mm or more, for example, when the cylindrical outer diameter is 4 mm and the thickness is 0.5 mm, the inner diameter becomes 3.0 mm (4 mm− (0.5 mm × 2)) A significant difference (difference in cooling performance) is not produced when the dimension H between the planes m is 2.2 mm.

FIG. 10 shows a gradually deformed portion of the heat radiating pipe, where (a) is a side view and (b) is a plan view.
As shown in FIGS. 10A and 10B, the heat radiating pipe 22B has a gradually deformed portion 22h at a portion connecting the flat cylindrical portions 22a to 22c and the cylindrical portions 22d to 22g.

  As shown in FIG. 10A, the gradually deforming part 22h extends from the cylindrical part 22d to 22g to the flat cylindrical part 22a to 22c (or from the flat cylindrical part 22a to 22c to the cylindrical part 22d to 22g. ) And an inclined portion (gradual change portion) 22h1 that changes gently so that the side opposite to the side in contact with the side plate 12b approaches the side plate 12b (or moves away from the side plate 12b). The gradually deforming portion 22h is configured such that a surface 22h2 opposite to the inclined portion 22h1 is in contact with the side plate 12b.

  As shown in FIG. 10 (b), the gradually deforming portion 22h gradually spreads from the width (outer diameter) D to the width W from the cylindrical portions 22d to 22g to the flat cylindrical portions 22a to 22c, or Inclined portions (gradually changing portions) 22h3 and 22h3 are formed so as to gradually narrow from the width W to the width (outer diameter) D from the flat cylindrical portions 22a to 22c to the cylindrical portions 22d to 22g.

  As described above, the connecting shape of the portions connecting (connecting) the flat cylindrical portions 22a to 22c and the cylindrical portions 22d to 22g of the heat radiating pipe 22B has a certain distance so that the flow resistance of the refrigerant does not become excessive. It is desirable to gradually change with S. For example, the distance S is desirably set to 2 mm or more.

  As described above, in the refrigerator 1 according to the present embodiment, the heat radiating pipe 22B has the flat cylindrical shape portions 22a to 22c and the cylindrical shape portions 22d to 22g, and the flat cylindrical shape portions 22a to 22c are the heat radiating pipe 22B. Are applied to the regions R1 to R3 in which the cylinders are straightly arranged, and the plane m of the flat cylindrical portions 22a to 22c is in contact with the outer box 12, and the cylindrical portions 22d to 22g are arranged by bending the heat radiating pipe 22B. Applied to R7 (see FIG. 5). According to this, it is possible to prevent the flow path resistance from increasing in the regions R4 to R7 where the heat radiating pipe 22B is bent and to improve the performance of the condenser 22. Thus, by improving the performance of the condenser 22, it becomes possible to reduce the power consumption of the refrigerator 1 (power consumption of the compressor 21, etc.).

  Moreover, in this embodiment, the slow deformation part 22h which connects flat cylindrical shape part 22a-22c and cylindrical shape part 22d-22g is provided, and the slow deformation part 22h has a distance of at least 2 mm or more in an axial direction. Yes. According to this, an increase in the flow path resistance of the refrigerant can be suppressed.

  Moreover, in this embodiment, the flat cylindrical shape parts 22a-22c, the cylindrical shape parts 22d-22g, and the gradually deformed shape part 22h are being fixed to the outer case 12 via the tape 24 which has heat dissipation (refer FIG. 7). . According to this, since the heat of the refrigerant is transmitted to the outer box 12 through the tape 24, the performance of the condenser 22 can be further improved.

  Moreover, in this embodiment, before bending the heat radiating pipe 22B into a shape to be placed on the outer box 12, the pipe 31 is pressed while the pipe 31 having a circular cross section wound in a coil shape is stretched to be flat in a cross sectional view. Flat cylindrical shape portions 22a to 22c, and flat cylindrical shape portions 22a to 22c and cylindrical shape portions 22d to 22g are alternately formed on the heat radiating pipe 22B (see FIG. 6). According to this, it is possible to configure the heat radiating pipe 22B in which the flat cylindrical part F and the cylindrical part C are alternately formed only by adding the press device 32 to the conventional manufacturing equipment, so that no significant equipment modification is required. Become. Further, by processing the cylindrical pipe 31 into a flat cylindrical portion, a general-purpose pipe can be used, and the manufacturing cost can be suppressed as compared with the purchase of a flat custom-made pipe. Moreover, since a cylindrical thing is processed into a flat shape instead of processing a flat cylindrical thing into a cylindrical shape, a process becomes easy.

1 Refrigerator 10 Insulated box (box)
12 outer box 12a upper plate 12b right side plate 12c left side plate 13 inner box 15 cooler (evaporator)
20 Refrigeration cycle part 21 Compressor 22 Condenser 22a, 22b, 22c Flat cylindrical part 22d, 22e, 22f, 22g Cylindrical part 22A Machine room condenser 22B Heat radiation pipe (refrigerant pipe)
22C Condensation prevention pipe 23 Capillary tube (pressure reduction device)
24 Tape 25 Vacuum insulation 25a Groove 31 Pipe
32 Press machine m Flat surface (flat surface)
P Gap S, S1, S2 Gradual deformation part

Claims (1)

A compressor that compresses the refrigerant; a condenser that condenses the refrigerant compressed by the compressor; a decompressor that decompresses the refrigerant condensed by the condenser; and an evaporation that evaporates the refrigerant decompressed by the decompressor. And a refrigeration cycle unit that is connected in order,
A box that houses the refrigeration cycle unit,
The box includes an outer box constituting an outer shell,
The condenser is disposed in contact with at least a part of the outer box, extends in the vertical direction along the left and right side plates of the outer box, and is disposed so as to be folded at the upper end portion and the lower end portion. Including refrigerant pipes arranged in the left-right direction along the upper plate of
The refrigerant pipe has a circular cylindrical shape portion in cross section and a flat cylindrical shape portion in a cross section view,
The cylindrical portion is applied to a region where the refrigerant pipe is bent and arranged and a region extending in the left-right direction,
The said flat cylinder shape part is applied to the area | region which arrange | positions the said refrigerant | coolant pipe | tube in the up-down direction, and the flat surface of the said flat cylinder shape part is in contact with the said outer box, The refrigerator characterized by the above-mentioned.

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