JP2007178080A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator-freezer capable of reducing flow resistance in foaming urethane, thinning walls of a heat insulating housing, enlarging a volume, and further reducing a refrigerant filling quantity. <P>SOLUTION: A condensing means is disposed in a state that a condensation pipe 130 is closely kept into contact with an outer casing 102, and a part or the whole of the condensing means is composed of a plurality of passages 231 arranged in parallel with each other, thus the condensation pipe 130 can be thinned, flowing resistance in filling and foaming urethane is reduced, and an uniform density of urethane heat insulating material 204 can be kept. Further the generation of voids can be reduced, and the deformation in appearance of the refrigerant outer casing 102 can be prevented. Further a thickness of the heat insulating housing 106 can be reduced and the internal volume can be increased. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a refrigerator composed of a heat insulating box formed by foaming and filling a heat insulating material in a gap between an outer box and an inner box.

  In recent years, as the demand for large-capacity refrigerators and installation space reductions increases, the refrigerator heat insulation walls are made thinner, and further, vacuum insulation materials are arranged and inserted to improve heat insulation performance (for example, Patent Document 1). reference).

  Hereinafter, the conventional refrigerator will be described with reference to the drawings.

  FIG. 11 shows an external perspective view of a conventional refrigerator. FIG. 12: shows the fragmentary top sectional view of the heat insulation box of the conventional refrigerator. As shown in FIGS. 11 and 12, the wall thickness structure of the conventional refrigerator 1 includes an outer box 2 that forms the outer wall of the refrigerator 1, an inner box 3 that forms the inner wall of the refrigerator, an outer box 2, and an inner box 3. Condensation of the urethane heat insulating material 4 foamed and filled between the heat insulating box 6 composed of the vacuum heat insulating material 5 disposed in the urethane heat insulating material 4, and the refrigerator cooling device disposed in the urethane heat insulating material 4 of the heat insulating box 6 It is constituted by a pipe (not shown).

  The vacuum heat insulating material 5 is composed of a jacket bag made of a film having a multilayer laminate structure that prevents gas permeation, and a core material made of fine powder such as silica and pearlite or inorganic fibers, and the core material is enclosed in the jacket. After that, the gas (air) in the jacket bag is exhausted, vacuumed and sealed by heat sealing. The thermal conductivity of the vacuum heat insulating material 5 is 0.008 to 0.0005 W / m · K, which is very excellent in heat insulating performance. Therefore, even if the wall thickness of the heat insulating box 6 is reduced, the heat insulating box 6 penetrates into the cabinet. It is possible to effectively reduce the amount of heat generated. In general, the vacuum heat insulating material 5 is fixed on the inner surface side of the outer box 2 having a relatively larger number of flat surfaces than the inner box 3 having many curved surfaces. In the conventional example, the outer case 2 and the vacuum heat insulating material 5 are fixed. A plate-like member 40 is disposed in the gap to secure a gap that can be stably held.

  The condensation pipe disposed in the urethane heat insulating material 4 is generally made of a copper tube or an iron tube, and is attached by an aluminum tape (not shown) or the like so as to contact the inner surface side of the outer box 2. This is because it is necessary to ground the outer box 2 and the condensation pipe to secure a heat radiation area in order to condense the high-temperature and high-pressure gas conveyed from the compressor (not shown). In order to reduce the amount of heat entering the inside, it is necessary to isolate the condensation pipe (copper pipe or iron pipe) from the refrigerator 1 as much as possible. Furthermore, in order to prevent the surface of the refrigerator 1 from being deposited, the heat of the condensing pipe must be effectively transmitted to the outer box 2 so that the surface temperature of the outer box 2 does not decrease as much as the ambient temperature outside the refrigerator. Can be mentioned.

As described above, in the conventional configuration, the heat transfer amount from the outer box 2 to the vacuum heat insulating material 5 can be suppressed, and the heat insulating box 6 excellent in heat insulating efficiency can be obtained.
JP 2000-304428 A

  In recent years, in order to save energy in refrigerators, cases in which the vacuum heat insulating material 5 is employed have been expanded in order to reduce the amount of heat entering from the outside to the inside. However, as a result, in order to maintain the internal volume, the wall thickness of the heat insulating box must be the same, and the wall thickness of the urethane heat insulating material must be reduced. In the conventional example, the vacuum heat insulating material 5 is disposed at a predetermined interval on the inner side by the plate-like member 40 installed on the inner surface of the outer box 2, so that the gap between the outer box 2 and the inner box 3 is filled. The urethane heat insulating material 4 is separated and arranged in two layers, and each thickness is thinner than a single layer. Further, the condensing pipe is in contact with the inner surface side of the outer box 1. From the above, these become flow resistance at the time of urethane foaming, causing urethane flow inhibition to a predetermined urethane foam space, reducing the urethane density, and generating voids on the back side of the refrigerator, the urethane flow downstream of the condensation pipe, etc. There was a problem.

  In addition, the air layer generated by the generation of these voids causes expansion and compression due to changes in the outside air temperature and the inside temperature, and pressure is applied to the surface of the outer box 2 to cause deformation in this portion.

  Furthermore, when trying to expand the storage capacity of food etc. by improving the internal volume efficiency of the refrigerator, that is, the internal volume ratio with respect to the external volume of the refrigerator, the interval between the external box and the insulated box, A means for reducing the wall thickness is conceivable. At this time, the thickness of the vacuum heat insulating material must be maintained or increased, and the thickness of the urethane must be reduced to an equivalent or lower thickness as an alternative in order to suppress the deterioration of the load performance in the warehouse caused by reducing the wall thickness as much as possible. At this time, there was a problem that the fluidity at the time of urethane foam deteriorated and the urethane density decreased.

  The present invention overcomes the conventional technical problem, and includes a condensing unit in which a condensing pipe is brought into close contact with an outer box of a refrigerator, and a part or all of the condensing unit is arranged in a plurality of paths arranged in parallel. By being comprised, it aims at reducing the flow resistance at the time of urethane foaming by reducing the diameter of a condensation pipe according to a path | route.

  In order to solve the above-described conventional problems, the refrigerator of the present invention includes an inner box, an outer box, a heat insulating box having a heat insulating material provided between the inner box and the outer box, and the heat insulating box. And a refrigeration cycle having at least a condensing unit and a refrigerant filled therein, and the condensing unit includes a portion in which a condensing pipe is closely attached to the heat insulating material side of the outer box of the heat insulating box body, In the refrigerant flow in the refrigeration cycle, at least a part of the condensing means has a plurality of parallel paths, and the diameters of the refrigerant pipes in the parallel paths and the refrigerant pipes other than the parallel paths are different.

  This makes it possible to reduce the diameter of the condensing pipe according to the path in cases where the urethane thickness is reduced due to the increased capacity of the refrigerator and cases where a large number of condensing pipes are provided. It has the effect | action that a flow resistance can be reduced.

  The refrigerator of the present invention is configured by a plurality of paths in which a part or all of the condensing pipe contacts the outer box in parallel, thereby reducing the flow resistance of urethane and maintaining a uniform urethane density. It is possible to suppress heat intrusion from the high-temperature air outside the chamber into the chamber. Furthermore, generation | occurrence | production of a void can be suppressed and the external appearance deformation | transformation of a refrigerator outer box can be prevented.

  The invention according to claim 1 is a heat insulating box having an inner box, an outer box, a heat insulating material provided between the inner box and the outer box, and at least a condensing means provided in the heat insulating box. And a refrigeration cycle filled with a refrigerant inside, wherein the condensing means comprises a portion in which a condensation pipe is brought into close contact with the heat insulating material side of the outer box of the heat insulation box, and the refrigerant in the refrigeration cycle In the flow, at least a part of the condensing means has a plurality of parallel paths, and the diameter of the refrigerant pipe in the parallel path is different from the diameter of the refrigerant pipes other than the parallel path. The flow resistance during filling and foaming decreases, and the urethane density can be kept uniform. Furthermore, generation | occurrence | production of a void can be suppressed and the external appearance deformation | transformation of a refrigerator outer box can also be prevented.

  According to a second aspect of the present invention, in addition to the refrigerator according to the first aspect, the first condensing pipe provided in the parallel path of the condensing means is a second condensing means provided other than the parallel path. Since the diameter of the pipe is smaller than that of the condensing pipe, the flow resistance during foaming with urethane is reduced, and the urethane density can be kept uniform. Furthermore, generation | occurrence | production of a void can be suppressed and the external appearance deformation | transformation of a refrigerator outer box can also be prevented.

  In addition to the refrigerator according to claim 1 or 2, the heat insulating member filled between the outer box and the inner box includes a first heat insulating portion made of urethane heat insulating material, and a vacuum heat insulating material. By having a second heat insulating part made of a material, the distribution area of the urethane heat insulating material 4 is separated and filled in two layers, and the thickness of the urethane pipe is thinner than that in the first layer, whereas the diameter of the condensation pipe is reduced. Thus, the flow resistance of urethane can be reduced, the urethane density can be kept uniform, the generation of voids can be suppressed, and the external appearance deformation of the refrigerator outer box can be prevented.

  According to a fourth aspect of the present invention, in addition to the refrigerator according to the third aspect, the second heat insulating portion is further provided with a support member so as to maintain a predetermined gap with the condensation pipe. The deformation of the part can be prevented, the urethane fluidity during urethane foaming can be improved, the urethane density can be made uniform and the generation of voids can be suppressed, and the external appearance deformation of the refrigerator outer box can also be prevented.

  Moreover, in addition to the refrigerator as described in any one of Claims 1 to 4, the invention as described in Claim 5 is described in Claims 1 to 4 because the cross section of the said condensation pipe becomes flat shape. In addition to the effects, the flow resistance of urethane due to the flattening of the condensation pipe can be reduced, the urethane density can be kept uniform, the generation of voids can be further suppressed, and the external appearance deformation of the refrigerator outer box can be prevented. Moreover, the energy-saving effect by a condensation capacity improvement is acquired.

(Embodiment 1)
1 is an external perspective view of a refrigerator according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view of the main part of the refrigerator according to Embodiment 1 taken along line AA ′ in FIG. 1, and FIG. FIG. 4 is a developed view of the outer box, FIG. 4 is a cross-sectional view of the main part BB ′ in FIG. 1 of the refrigerator according to the embodiment, and FIG. Hereinafter, embodiments of a refrigerator according to the present invention will be described with reference to the drawings. In addition, about the same structure as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  From FIG. 1 and FIG. 2, a heat insulating box body 106 made of a steel heat insulating outer box 102, a hard resin inner box 103, and a urethane heat insulating material 104 filled between the outer box 102 and the inner box 103 by foaming is obtained. The refrigerator compartment 110, the freezer compartment 111, the vegetable compartment 112, the switching compartment 113, and the ice making compartment 114, which are separated by the internal partition wall 107, are configured.

  Further, a refrigerator compartment sensor 115 for detecting the temperature of the refrigerator compartment 110, a freezer compartment sensor 116 for detecting the temperature of the freezer compartment 111, a refrigerator compartment damper 117 (not shown) for adjusting the cold air to the refrigerator compartment 110, Machine which arrange | positions the evaporator 118 arrange | positioned focusing on the back of the vegetable compartment 112 which comprises the refrigerating cycle of the refrigerator 101, the fan 119 which ventilates an evaporator, and the compressor 120 installed in the back upper part of the refrigerator 101 exterior. It consists of chamber 121.

  The refrigerator compartment 110 is normally set at 1 to 5 ° C. with the lower limit of the temperature at which it is not frozen for refrigerated storage. The vegetable room 112 is often set to a temperature setting of 2 ° C. to 7 ° C. that is the same as or slightly higher than that of the refrigerator room 110. If the temperature is lowered, the freshness of leafy vegetables can be maintained for a long time.

  The freezer compartment 111 is usually set at −22 to −18 ° C. for frozen storage, but may be set at a low temperature of −30 to −25 ° C., for example, to improve the frozen storage state.

  3, the outer box 102 is composed of a back plate 102a, side plates 102b and 102c, a top plate 102d, and a bottom plate 102e. Usually, the two surfaces of the side plates 102b and 102c and the top plate 102d are a single steel plate. It is bent and formed.

  Here, the arrangement of the condensation pipe 130 will be described along the flow of the refrigerant. A single-pass condensation pipe (second condensation pipe) 130 discharged from the compressor 120 in the inner space of the machine room 121 at the upper rear surface of the refrigerator 101. Is branched into parallel paths (first condensing pipes) 131a and 131b, heads upward to the side plate 102b, immediately moves in parallel and then moves downward, makes a U-turn in the lower part, and heads upward again. The face plate 102d is entered. And it enters into the side plate 102c on the opposite side, translates downward, and the condensation pipe 130 joins again to form a single path. After that, it faces the immersion pipe 123 in the evaporating dish 122 and the front end (not shown) of the outer box 102, enters the side plate 102 c again, faces upward, and is finally disposed in the machine room 121. Combine with.

  In the present embodiment, the pipe diameter of the parallel paths 131a and 131b is 2 mm. This is because the sum of the pipe cross-sectional area of the single-pass condensing pipe 130 (outer diameter 4 mm) and the pipe cross-sectional areas of the parallel circuits 131a and 131b after branching is made substantially equal to maintain the refrigerant flow rate in the pipe. Consideration is given so as not to adversely affect the transport of the refrigerating machine oil.

  The operation of the refrigerator of the present embodiment configured as described above will be described below with reference to FIGS. 2, 3, 4, and 5.

  The condition for starting the operation of the refrigerator 101 is when the temperature of the refrigerator compartment sensor 115 or the freezer compartment sensor 116 is equal to or higher than the starting temperature, and the condition for stopping the operation is that both the refrigerator compartment sensor 115 and the freezer compartment sensor 116 are operated. This is the case of the stop temperature or lower.

  First, cooling of the freezer compartment 111 will be described. When the freezer compartment 111 rises in temperature due to intrusion heat from outside air, door opening and closing, etc., and the freezer compartment sensor 116 reaches the start temperature or higher, the compressor 120 is started and cooling is started. The high-temperature and high-pressure refrigerant discharged from the compressor 120 passes through the above-described piping path, and is finally installed in the outer box 102 while finally reaching a dryer (not shown) disposed in the machine room 121. The condensation pipe 130 is cooled and liquefied by heat exchange with the outside air of the side plates 102b and 102c and the top plate 102d and the urethane heat insulating material 104 in the cabinet.

  Next, the liquefied refrigerant is decompressed by the capillary tube 135, flows into the evaporator 118, and cools the interior by heat exchange with the interior air around the evaporator 118. Thereafter, the refrigerant is heated and gasified, and returns to the compressor 120. When the inside of the refrigerator is cooled and the temperature of the freezer compartment sensor 116 is equal to or lower than the stop temperature, and the temperature of the refrigerator compartment sensor 115 is equal to or lower than the stop temperature, the operation of the compressor 120 is stopped.

  Next, cooling of the refrigerator compartment 110 will be described. Similar to the freezer compartment 111, when the internal temperature rises and the temperature of the refrigerator compartment sensor 115 becomes equal to or higher than the starting temperature, the refrigerator compartment damper (not shown) is opened and the compressor 120 is started to operate. The cool air from the evaporator 118 flows into the refrigerating chamber 110 by the blower fan 119 to cool the internal air temperature, the refrigerating chamber sensor 115 temperature becomes lower than the stop temperature, and the freezer compartment sensor 116 temperature falls below the stop temperature. In this case, the operation of the compressor 120 is stopped. Further, the refrigerator compartment damper in the air passage between the refrigerator compartment 110 and the evaporator 118 is fully closed when the temperature of the refrigerator compartment 110 is not higher than the stop temperature, and the operation of the compressor 120 continues if the temperature of the freezer compartment 111 is not less than the stop temperature. Even so, freezing is prevented by preventing the temperature of the refrigerator compartment 110 from dropping below the temperature at this point.

  Next, the urethane foaming process inside the heat insulation box 106 will be described. With the front surface of the heat insulation box 106 facing down and the back surface facing up, the fixing jig for preventing foam deformation is attached to the outer shell and the inner box of the outer box 102. It is made to contact | abut to the outline of 103. Next, the stock solution of the urethane heat insulating material 104 is injected from an arbitrary inlet 125 on the back surface, and dropped onto the front surface side. The urethane begins to foam after a few seconds, and the foaming is promoted upward, that is, toward the back side. The urethane on the bubbles flows to fill a predetermined space, and when the urethane is cured, the heat insulation box 106 is completed. To do.

  At this time, the pipe diameter can be reduced by using the condensing pipe 130 in parallel paths 131a and 131b as in the present embodiment. As a result, the flow space of the urethane heat insulating material 104 flowing through the condensation pipe 130 is expanded, and the flow resistance can be reduced. Accordingly, it is possible to prevent a decrease in the filling density of urethane and to prevent generation of voids. As a result, external deformation of the outer box 102 is also suppressed, and the strength of the heat insulating box 106 is increased.

  Furthermore, if the condensation pipe 130 installed in close contact with the inner surface of the outer box 102 is branched and joined, the pipe volume increases, which leads to deformation of the outer box 102 surface. By arranging the coupling in the machine chamber 121 and the evaporating dish 122 installation space, it is possible to minimize deformation of the outer surface due to an increase in the piping volume.

  Furthermore, since the brazing operation performed when the pipes are connected due to branching and coupling can be performed in the machine room 121 or the evaporating dish 122 installation space, workability can be improved.

  In the present embodiment, the machine room 121 is disposed at the upper part of the back surface, but the same piping configuration is provided by disposing the condensing pipe 130 upside down with respect to the heat insulating box body 106 by disposing the machine room 121 at the lower surface of the back surface. And the effect of suppressing the flow resistance of urethane is obtained.

  In the future, even when the thin wall structure of the heat insulation box 106 is adopted, by adopting the configuration of the parallel paths 131a and 131b, it is possible to reduce the wall thickness of the heat insulation box 106 and improve the volume efficiency of the refrigerator. Improvement, that is, increase in capacity can be realized.

(Embodiment 2)
6 is a longitudinal sectional view of the main part of the refrigerator according to the second embodiment of the present invention, FIG. 7 is an exploded perspective view of the outer box of the refrigerator according to the same embodiment, and FIG. 8 is a plan sectional view of the main part of the refrigerator according to the same embodiment. FIG.

  Hereinafter, embodiments of a refrigerator according to the present invention will be described with reference to the drawings. In addition, the structure of the refrigerator-freezer in this Embodiment is the same structure as Embodiment 1 except a heat insulation box, and abbreviate | omits description.

  6, 7, and 8, the vacuum heat insulating material 250 is disposed on the urethane heat insulating material 204 that is filled in the gap between the outer box 202 and the inner box 203 by the spacer 251. The spacers 251 are made of, for example, an integral plate-like resin member having a cross section coupled with a plurality of conical shapes, and each is fixed by an adhesive or the like at a constant interval on the inner surface side of the outer box 202. 4 are installed per side plate.

  As a result, the urethane heat insulating material 204 is separated into the two-layer space of the outer space 252a and the inner space 252b as a result of foam filling. For example, in this embodiment, when the average wall thickness of the heat insulation box 206 is 32 mm, the wall thickness of the vacuum heat insulating material 250 is 10 mm, the wall thickness of the outer space 252a is 10 mm, the wall thickness of the inner space 252b is 10 mm, the outer wall thickness is 1 mm, and the inner wall The thickness is 1 mm.

  Further, as shown in FIG. 7, the condensing pipe 230 is disposed in close contact with the inner surface of the outer box 202 in the cono-shaped gap of the spacer 251 and has a flat cross section. When closely contacting the inner surface of the outer box, the total height from the inner surface of the outer box 202 is 1.5 mm.

  Next, the manufacturing method of the heat insulation box 206 using the vacuum heat insulating material 250 in the present invention will be described. First, as shown in FIG. 6, the condensation pipe 230 is arranged on the inner surface of the outer box 202 and fixed with the aluminum tape 11. To do. In another process, the spacer 251 is fixed to the side surface of the outer case 201 of the vacuum heat insulating material 250 with an adhesive. Further, the spacer 251 integrated with the vacuum heat insulating material 250 is fixed to the side plates 202b and 202c with an adhesive or the like. Further, the outer box 202 and the inner box 203 are fitted in the next process to secure a space for filling the urethane heat insulating material 204. At the same time, refrigeration cycle parts and the like are also mounted at the same time to complete the box before foaming with urethane.

  The details when foaming urethane will be described. Foaming starts from the front of the box, but in the region of the vacuum heat insulating material 250, the space filled with urethane is separated into an outer space 252a and an inner space 252b of the vacuum heat insulating material 250. The At this time, the wall thickness of these gaps is as narrow as about 10 mm, respectively, and the flow resistance of urethane foam becomes remarkably high. In particular, a conventional condensing pipe is usually 4 mm in diameter, and the urethane passage gap in this portion is 6 mm. And the flow resistance becomes extremely high.

  Therefore, as in this embodiment, the pipe diameter is reduced in the parallel path (for example, 2 mm) in order to make the flow velocity of the refrigerant flowing through the condensing pipe 230 the same. Furthermore, as a result of making the shape of the pipe flat 242, the height from the outer box is 1.5 mm, the gap in the pipe portion is increased by + 42% compared to the conventional case, and the flow space of the urethane heat insulating material 204 flowing through the condensation pipe 230 is increased. It can be significantly enlarged and the flow resistance can be greatly reduced. Accordingly, it is possible to prevent a decrease in the filling density of urethane and to prevent generation of voids. As a result, external deformation of the outer box 202 is also suppressed, and the strength of the heat insulating box 206 is increased.

  Furthermore, by setting the cross-sectional shape of the condensing pipe 230 to a flat shape 242, the flow resistance of urethane is lowered, and the filling density of urethane can be made more uniform. Further, heat conduction from the parallel path to the outer box 202 is promoted, heat dissipation capability is improved, and energy saving can be achieved. Also, if the heat dissipation capacity is equivalent, the overall length of the condensing pipe 230 can be shortened, so that the flow resistance of urethane can be further reduced, and the amount of refrigerant enclosed can be reduced, which is safe when using a flammable refrigerant. The property can be remarkably improved.

(Embodiment 3)
FIG. 9 is a plan sectional view of a main part of a refrigerator according to Embodiment 3 of the present invention. In addition, the structure of the refrigerator-freezer in this Embodiment is the same structure as Embodiment 2 except arrangement | positioning of a vacuum heat insulating material, and abbreviate | omits description.

  From FIG. 9, the vacuum heat insulating material 350 is disposed on the urethane heat insulating material 305 filled in the gap between the outer box 302 and the inner box 303 by the spacer 351. The spacer 351 is made of, for example, an integral plate-like resin member having a plurality of cono-shaped cross sections, and each is fixed with an adhesive or the like at a constant interval on the inner surface side of the inner box 303. 4 are installed per side surface of the inner box 303.

  As a result, the outer space 252a of the urethane heat insulating material 304 that flows through the reduced parallel path has no spacer 351, so that it can be remarkably enlarged and the flow resistance can be greatly reduced. Therefore, it is possible to prevent a decrease in the filling density of urethane and to prevent generation of voids.

  Further, since the spacer 351 for supporting and fixing the vacuum heat insulating material 350 is not in contact with the outer box 302 and the urethane heat insulating material 304 is filled and disposed, the outer case 302 is also prevented from being deformed, and the heat insulating box 306 Strength also increases.

(Embodiment 4)
FIG. 10 is a developed view of the outer box of the refrigerator according to the fourth embodiment of the present invention. In addition, the structure of the refrigerator-freezer in this Embodiment is the same structure as Embodiment 2 except arrangement | positioning of the condensation pipe 430, and abbreviate | omits description.

  Referring to FIG. 10, the arrangement of the condensing pipe 430 will be described along the flow of the refrigerant. In the inner space of the machine room 1421, the single-pass condensing pipe 430 discharged from the compressor 120 is branched into parallel paths 431a and 431b. . Next, entering the top plate 402c, facing the top of the side plates 402b and 402c, entering and immediately going downward, making a U-turn and going upward again, finally joining the evaporating dish 122 installation space, single path It becomes. Then, it faces the front end (not shown) of the immersion pipe 123 and the outer box 402 in the evaporating dish 122, enters the side plate 102 c again, faces upward, and is finally placed in the machine room 121. (Not shown).

  Also in the condenser pipe 430 arrangement, the pipe diameter can be reduced as in the first embodiment. As a result, the flow space of the urethane heat insulating material 404 flowing through the condensation pipe 430 is expanded, and the flow resistance can be reduced. Accordingly, it is possible to prevent a decrease in the filling density of urethane and to prevent generation of voids. As a result, external deformation of the outer box 402 is also suppressed, and the strength of the heat insulating box is increased.

  Furthermore, the deformation of the outer surface due to an increase in the pipe volume can be minimized.

  Furthermore, since the brazing operation performed when the pipes are connected due to branching and coupling can be performed in the machine room 121 or the evaporating dish 122 installation space, workability can be improved.

  As described above, the refrigerator according to the present invention can realize a thin wall and a large capacity of the heat insulating box of the refrigerator by reducing the flow resistance of urethane. Furthermore, since the amount of refrigerant enclosed can be reduced, it can be applied to thin walls and large capacity applications in general refrigeration equipment.

1 is an external perspective view of a refrigerator according to Embodiment 1 of the present invention. Sectional view along line A-A 'in FIG. 1 of the refrigerator of the same embodiment Exploded view of the outer box of the refrigerator of the same embodiment B-B 'line principal part sectional drawing in FIG. 1 of the refrigerator of the embodiment Cycle schematic diagram of refrigerator of same embodiment The principal part longitudinal cross-sectional view of the refrigerator by Embodiment 2 of this invention The exploded perspective view of the outer box of the refrigerator of the embodiment Main part plane sectional drawing of the refrigerator of the embodiment Main part plane sectional drawing of the refrigerator by Embodiment 3 of this invention Exploded view of the outer box of the refrigerator according to the fourth embodiment of the present invention External perspective view of heat insulation box of conventional refrigerator Partial plan sectional view of a conventional heat insulation box of a refrigerator

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Refrigerator 102 Outer box 103 Inner box 104,204 Urethane heat insulating material 106,206,306 Heat insulation box 118 Evaporator 120 Compressor 130,230,430 Condensation pipe 131a, 131b, 431a, 431b Parallel path 135 Capillary tube 242 Flat shape 250, 350 Vacuum heat insulating material 251, 351 Spacer (support member)

Claims (5)

  A heat insulating box having an inner box, an outer box, and a heat insulating material provided between the inner box and the outer box; and at least a condensing means provided in the heat insulating box and filled with a refrigerant. A refrigerating cycle, and the condensing means includes a portion in which a condensing pipe is in close contact with the heat insulating material side of the outer box of the heat insulating box, and at least a part of the condensing means in the flow of the refrigerant in the refrigerating cycle Has a plurality of parallel paths, and the diameters of the refrigerant pipes of the parallel paths differ from those of the refrigerant pipes other than the parallel paths.   2. The refrigerator according to claim 1, wherein the first condensing pipe provided in the parallel path of the condensing means has a smaller pipe diameter than the second condensing pipe which is the condensing means other than the parallel path.   The refrigerator according to claim 1 or 2, wherein the heat insulating member filled between the outer box and the inner box has a first heat insulating part made of urethane heat insulating material and a second heat insulating part made of vacuum heat insulating material.   The refrigerator of Claim 3 which provided the supporting member so that a 2nd heat insulation part may maintain a predetermined | prescribed clearance gap with a condensation pipe.   The refrigerator according to any one of claims 1 to 4, wherein the condenser pipe has a flat cross section.

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