JP2005195201A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulating box usable for a refrigerator or a hot/cold insulation box, having improved heat insulating performance or productivity. <P>SOLUTION: A thermoplastic resin 17 is previously applied to the inner face of an outer box 4 of a space portion between an inner box 3 and the outer box 4 along the outer periphery of a core material 2 formed of a sheet inorganic fiber assembly 7. It is covered with an outer shell material 8 formed of a gas barrier film, thermally welded and then vacuumed to form a vacuum heat insulating material 2 in a space between the inner box 3 and the outer box 4. A hard urethane 6 is foamed and filled in the space between the inner box 3 and the outer box 4 to reasonably form the heat insulating box having high heat insulating performance with the lapse of time. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a refrigerator in which cooling units are integrated at the top.

As for a refrigerator with a conventional cooling unit concentrated on the upper part, the evaporator is connected to the lower side, the compressor is connected to the upper part of the unit base, and the evaporator is connected to the upper part of the unit base. In some cases, the inlet and outlet pipes of the vessel are connected to a condenser and a compressor to seal the gap in the unit base communication hole. (For example, see Patent Document 1)
Hereinafter, the conventional refrigerator will be described with reference to the drawings.

  FIG. 5 is a schematic cross-sectional view of a conventional refrigerator, and FIG. 6 is a cross-sectional view of a cooling unit arranged at the top of the refrigerator.

  As shown in FIGS. 5 and 6, a conventional refrigerator 1 includes a heat insulating material box 2 in which holes are connected to each other and foamed and filled with urethane, a storage chamber 3 inside the heat insulating box, and an openable / closable storage chamber A unit base 5 arranged at the upper part of a hole communicating with the upper part of the door 4 and the heat insulating box 2, a compressor 6, a condenser 7, a condenser fan 8, a dryer 9 arranged at the upper part of the unit base, and a unit base An evaporator 10 and an evaporator fan 11 arranged at the lower part, a capillary tube 12 of a decompression device arranged between the dryer 9 and the evaporator 10, a suction pipe 13 connecting the outlet of the evaporator 10 and the compressor 6, and a capillary It is comprised from the heat insulation foam 14 which insulates the tube 12 and the suction pipe 13 from the outside, and the flexible foam 15 which fills the clearance gap between the hole of the unit base 5, and refrigerant | coolant piping.

  The capillary tube 12 and the suction pipe 13 are in close contact with each other in the heat insulating foam 14 by soldering.

  The structure of the connection portion between the evaporator 10 and other pipes is such that the inlet and outlet pipes of the evaporator 10 are projected upward from the holes communicating with the unit base and joined to other pipes. A gap around the pipe is filled with the flexible foam 15.

  About the refrigerator comprised as mentioned above, the operation | movement is demonstrated below.

When the temperature of the storage chamber 3 of the refrigerator 1 rises due to intrusion heat from outside air and the opening / closing of the storage chamber door 4 and the internal temperature sensor (not shown) exceeds the ON temperature, the compressor 6 is activated and stored. Cooling of the chamber 3 is started. The high-temperature and high-pressure refrigerant discharged from the compressor 6 is cooled and liquefied by the air sent from the condenser fan 8 by the condenser 7. Further, moisture is removed from the liquefied refrigerant by the dryer 9 and the pressure is reduced by the capillary tube 12. The decompressed liquefied refrigerant in the capillary tube 12 is cooled by heat exchange with the low-temperature refrigerant in the suction pipe 13 soldered in the heat insulating foam 14. Then, the supercooled liquid refrigerant flows into the evaporator 10 and is gasified by heat exchange with the internal air sent by the evaporator fan 11 to cool the internal air. After that, it passes through the suction pipe 13 in the heat insulating foam 14, and at that time, the heat of the refrigerant in the capillary tube 12 is absorbed to return to the compressor 31 in a gas state. When the interior is cooled and the temperature of the interior temperature sensor becomes equal to or lower than the OFF temperature, the operation of the compressor 6 is stopped.
JP 2002-39665 A

  However, in the above-described conventional configuration, when the refrigerant in the suction pipe 13 and the capillary 12 performs heat exchange, the surroundings is insulated only by the heat insulating foam 14 and it is difficult to sufficiently insulate the refrigerant in the suction pipe 13. Absorbs heat from the outside air, and the heat of the refrigerant in the capillary 12 cannot be absorbed efficiently by the suction pipe 13. Therefore, it is difficult to sufficiently secure the supercooling in the refrigeration cycle, and it is difficult to improve the efficiency of the refrigeration cycle.

  In addition, in the conventional evaporator 10 connection configuration, it is difficult to completely seal the gap around the piping of the hole in the unit base 5 with the flexible foam 15, and the heat insulation performance of the flexible foam is higher than that of the urethane heat insulating material. Therefore, there is a problem that the heat absorption amount of the heat insulating box 2 is increased.

  The present invention overcomes the conventional technical problem, efficiently exchanging heat between the suction pipe 13 and the capillary tube 12 to improve the efficiency of the refrigeration cycle, and further to improve the heat insulation performance of the unit base 5 to provide a heat insulation box. It aims at providing the refrigerator provided with the structure which can realize further energy saving by reducing the amount of heat absorption of a body.

  In order to solve the above-described problems, the refrigerator of the present invention has a unit base filled with a heat insulating material such as urethane foam, an evaporator disposed on the lower side of the unit base, and an upper side of the unit base. A compressor and a condenser, a suction pipe of a refrigerant pipe connecting the outlet of the evaporator and the compressor, and a capillary tube of a decompression device arranged in close contact with the suction pipe, and the suction pipe and the capillary tube Improving the efficiency of the refrigeration cycle by promoting heat exchange between the suction pipe and the capillary tube and obtaining a large amount of supercooling by performing heat exchange in a place surrounded by urethane insulation in the unit base. Can do. Further, by filling the hole communicating with the unit base with urethane foam together with the refrigerant piping, the sealing performance of the communication hole of the unit base is improved and the heat absorption amount of the heat insulating box is reduced, thereby realizing further energy saving. be able to.

  According to the refrigerator of the present invention, a unit base filled with a heat insulating material such as urethane foam, an evaporator disposed below the unit base, and a compressor and a condenser disposed above the unit base A suction pipe of a refrigerant pipe connecting the outlet of the evaporator and the compressor, and a capillary tube of a decompression device arranged in close contact with the suction pipe, and heat exchange between the suction pipe and the capillary tube is performed by the unit. By performing in a place surrounded by the urethane heat insulating material in the base, heat exchange between the suction pipe and the capillary tube is promoted to obtain a large amount of supercooling, thereby improving the efficiency of the refrigeration cycle. Further, by filling the hole communicating with the unit base with urethane foam together with the refrigerant piping, the sealing performance of the communication hole of the unit base is improved and the heat absorption amount of the heat insulating box is reduced, thereby realizing further energy saving. be able to.

  The invention of the refrigerator according to claim 1 includes a unit base filled with a heat insulating material such as urethane foam, an evaporator disposed below the unit base, and a compressor disposed above the unit base. And a condenser, a suction pipe of refrigerant piping connecting the evaporator outlet and the compressor, and a capillary tube of a decompression device arranged in close contact with the suction pipe, and heat exchange between the suction pipe and the capillary tube Is performed in a place surrounded by the urethane heat insulating material in the unit base, so that heat exchange between the suction pipe and the capillary tube is promoted and supercooling can be obtained to improve the efficiency of the refrigeration cycle. . Further, by filling the hole communicating with the unit base with urethane foam together with the refrigerant piping, the sealing performance of the communication hole of the unit base is improved and the heat absorption amount of the heat insulating box is reduced, thereby realizing further energy saving. be able to.

  According to a second aspect of the present invention, in the first aspect of the present invention, any one of the upper and lower surfaces of the unit base is formed of a resin, and the fixed portion is configured by a protruding shape from the resin surface. By arranging the capillary tube and the suction pipe at an intermediate position of the unit base surrounded by a heat insulating material, the heat absorption from the outside to the suction pipe is minimized, and the heat from the capillary tube is reduced. It can be absorbed to the maximum extent.

  According to a third aspect of the present invention, in the first aspect of the present invention, a vacuum heat insulating material having a very large heat insulating performance is disposed on the lower surface of the unit base, and a suction pipe and a capillary are disposed above the vacuum heat insulating material. By fixing the tube, the amount of heat entering from the high temperature side such as the compressor and condenser on the upper part of the unit base to the evaporator and the low temperature side in the cabinet can be greatly reduced.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the length of heat exchange between the capillary tube and the suction pipe is about 1000 mm or more, thereby evaporating. Even when the vessel has frosted and a large amount of liquid refrigerant has flowed into the suction pipe, the heat exchange length with the capillary tube is sufficiently secured, so that the refrigerant becomes a gas refrigerant at the outlet of the suction pipe. It is possible to prevent the efficiency deterioration and breakage of the compressor due to the back.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the vertical thickness of the unit base is set to about 50 mm or more, so that the suction is provided in the unit base. Even when miscellaneous objects such as pipes and capillary tubes are arranged, a urethane flow path is secured when foaming, and deterioration of the heat insulating performance of the unit base due to unfilling of the foam heat insulating material can be prevented. Moreover, since the thickness of the unit base of 50 mm or more can withstand the stress in the vertical direction, the unit base is prevented from being deformed by a load of a compressor or the like to prevent the internal suction pipe and capillary tube from being deformed or damaged. Can do.

  Invention of Claim 6 of this invention can provide the refrigerator which has the said effect | action in the invention as described in any one of Claim 1 to 5 by installing the said freezing / refrigeration unit in the heat insulation box upper part. .

  Hereinafter, embodiments of 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. Further, the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a perspective view of a refrigerator according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view of a unit base arranged on the top of the refrigerator according to the embodiment, and FIG. 3 is a top projection view of the unit base according to the embodiment. It is.

  As shown in FIGS. 1 and 2, the refrigerator 16 according to the first embodiment covers the heat insulating box 17 in which a hole is connected to the upper part and foamed with urethane heat insulating material, and the hole in the upper part of the heat insulating box 17. A unit base 18 disposed, a compressor 19, a condenser 20, a condenser fan 21, and a dryer 22 constituting a refrigeration cycle disposed above the unit base 18, and an evaporator 23 disposed below the unit base 18. An evaporator fan 24, a suction pipe 25 and a capillary tube 26 which are disposed inside the unit base 18 and integrally foamed with urethane heat insulating material, and a storage chamber door 27 are configured.

  As shown in FIG. 1, the unit base 18 is detachable from the heat insulating box 17, and the components constituting the refrigeration cycle are attached to the upper and lower surfaces, so that the box and the cooling unit are completely separated. Therefore, it is possible to easily perform maintenance such as replacement of refrigeration cycle parts.

Further, as shown in FIG. 2, the suction pipe 25 and the capillary tube 26 in the unit base 18 are bonded by soldering, and heat exchange is promoted between them, and the heat exchange distance is 1000 mm. is there.
Further, the lower surface side of the unit base 18 is formed of a resin member, and the suction pipe 25 and the capillary tube 26 are moved to an intermediate position of the unit base 18 by a fixing portion 28 having a protruding shape from the lower surface of the unit base as shown in FIG. The unit base 18 has a vertical thickness of 50 mm.

  The outlet pipe of the condenser 20 is connected to the lower dryer 22 after being raised to a position higher than the height of the condenser 20.

  As shown in FIG. 3, the soldered suction pipe 25 and capillary tube 26 are inserted into the unit base 18 from above and fixed in an intermediate position by the fixing portion 28 while meandering in the unit base 18. Arranged so that it comes out from below the unit base.

  About the refrigerator of this Embodiment comprised as mentioned above, the operation | movement is demonstrated below.

  When the internal temperature of the refrigerator 16 rises due to intrusion heat from outside air, door opening and closing, etc., and the internal temperature sensor (not shown) becomes equal to or higher than the ON temperature, the compressor 19 is activated and cooling is started. The high-temperature and high-pressure refrigerant discharged from the compressor 19 is cooled and liquefied by the air sent from the condenser fan 21 in the condenser 20. Further, moisture is removed from the liquefied refrigerant by the dryer 22, and the pressure is reduced by the capillary tube 26 in the unit base 18. The liquefied refrigerant decompressed in the capillary tube 26 is cooled by heat exchange with the refrigerant in the suction pipe 25 that is soldered. Then, the supercooled liquid refrigerant flows into the evaporator 23, gasifies by heat exchange with the internal air sent by the evaporator fan 24, cools the internal air, and the suction in the unit base 18. Passing through the pipe 25, the heat of the refrigerant in the capillary tube 26 is absorbed at that time, and the gas state is returned to the compressor 19. When the interior is cooled and the temperature of the interior temperature sensor becomes equal to or lower than the OFF temperature, the operation of the compressor 19 is stopped.

  As described above, in the refrigerator of the present embodiment, the suction pipe 25 and the capillary tube 26 are fixed to the intermediate position of the unit base 18 filled with the heat insulating material by the fixing portion 28 on the lower surface of the unit base 18, Insulated. As a result, heat transfer from the refrigerant liquefied while being reduced in pressure in the capillary tube 26 to the low-temperature refrigerant flowing into the suction pipe 25 can be promoted. Therefore, the degree of supercooling at the outlet of the capillary tube 26 can be increased, and the efficiency of the refrigeration cycle can be greatly improved.

  Further, the upper surface of the unit base 18 has a high temperature because of the presence of the compressor 19 and the condenser 20, and the lower surface has a low temperature because of the evaporator 23 and the internal space. The members constituting the outer periphery of the unit base 18 of the present embodiment are an iron member on the upper surface and a resin member on the lower surface, and therefore block heat transfer by the outer peripheral member from the upper surface to the lower surface of the unit base 18. The amount of heat entering the refrigerator is reduced.

  When the evaporator 23 is abnormally frosted, the frost on the surface of the evaporator 23 hinders heat exchange between the low-temperature refrigerant and the internal air, and the refrigerant cannot evaporate sufficiently in the evaporator 23. As a result, a large amount of liquid refrigerant flows into the suction pipe 25 inlet. On the other hand, even when the refrigerator 16 starts to cool, the refrigerant staying in the evaporator 23 when the compressor 19 is stopped returns rapidly to the compressor side, so that the liquid refrigerant flows into the suction pipe 25 inlet. To do. In this way, when the liquid refrigerant flows into the suction pipe 25 and the refrigerant is sucked by the compressor 19 while being in a liquid state and liquid compression occurs, the performance of the compressor 19 is reduced by reducing the volume efficiency of the compressor 19. Decreases. Furthermore, when liquid refrigerant is mixed in the suction gas for a long period of time, there is a possibility that functional parts such as the suction valve of the compressor 19 are damaged. In the present embodiment, since the length of the heat exchange portion between the suction pipe 25 and the capillary tube 26 disposed in the unit base 18 is secured to 1000 mm or more, the liquid refrigerant is placed inside the suction pipe 25 as described above. Even if the gas flows in, it evaporates by heat exchange with the capillary tube 26 and becomes a gas refrigerant, which prevents the performance of the compressor 19 from being deteriorated and the functional parts from being damaged.

  Further, the unit base 18 is provided with a suction pipe 25 and a capillary tube 26 inside, and after sealing the piping portion and the hole of the unit base 18, the unit base 18 is filled with foamed urethane from an inlet (not shown). At this time, since the thickness of the unit base 18 is 50 mm or more, a sufficient space for the urethane foam to flow between the suction pipe 25, the capillary tube 26 and the fixing portion 28 at an intermediate position of the unit base 18 is secured. The urethane heat insulating material spreads throughout 18 and the urethane unfilled portion can be eliminated.

  In the present embodiment, the suction pipe 25 and the capillary tube 26 in the unit base 18 are fixed by the fixing portion 28 having a protruding shape from the lower surface of the unit base 18, but as shown in FIG. The vacuum heat insulating material 29 may be disposed so as to be in contact with the lower surface, and the suction pipe 25 and the capillary tube 26 may be attached and fixed to the upper surface portion with a tape or the like. In that case, in addition to the suction pipe 25 and the capillary tube 26 being fixed at an intermediate position of the unit base, the heat insulating performance of the unit base is improved by the vacuum heat insulating material 29 having a higher heat insulating performance than urethane, so that the refrigerator 16 The amount of heat absorbed can be reduced.

  As described above, the refrigerator according to the present invention has a heat insulating box made of foam heat insulating material by improving the efficiency of the refrigeration cycle and reducing the amount of heat absorbed by the heat insulating box. Useful in product fields such as cooling equipment.

The inclination figure of the refrigerator by Embodiment 1 of this invention Sectional drawing of the unit base arrange | positioned at the upper part of the refrigerator by the embodiment Top view of unit base according to the embodiment Sectional drawing of the unit base arrange | positioned at the upper part of the refrigerator by the embodiment Schematic sectional view of a conventional refrigerator Cross-sectional view of a cooling unit arranged at the top of a conventional refrigerator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 9, 18 Heat insulation box 2 Vacuum heat insulating material 3,12 Inner box 4,13 Outer box 5 Flange 6 Hard urethane foam 7 Sheet-like glass wool aggregate 8 Outer material 10 Box part 11 Lid part 14 Inner frame 15 Outer frame 16 Expanded polystyrene 17 Adsorbent 19 Thermoplastic resin

Claims (6)

A unit base filled with a heat insulating material such as urethane foam; an evaporator disposed below the unit base; a compressor and a condenser disposed above the unit base; the evaporator outlet; A refrigeration system comprising a suction pipe of a refrigerant pipe connecting a compressor and a capillary tube of a decompression device arranged in close contact with the suction pipe, wherein the suction pipe and the capillary tube are arranged inside the unit base. Refrigerated unit. Either one of the upper and lower surfaces of the unit base is molded from resin, and the capillary tube and the suction pipe are placed at an intermediate position of the unit base surrounded by a heat insulating material by a fixing part constituted by a protruding shape from the resin surface. The refrigeration unit according to claim 1, wherein the refrigeration unit is arranged. 2. The refrigeration refrigerator according to claim 1, wherein a vacuum heat insulating material having a very large heat insulating performance is disposed so as to be in contact with a lower surface inside the unit base, and a suction pipe and a capillary tube are fixed to the upper portion of the vacuum heat insulating material. unit. The refrigeration unit according to any one of claims 1 to 3, wherein a length of heat exchange between the capillary tube and the suction pipe is about 1000 mm or more. The refrigeration unit according to any one of claims 1 to 4, wherein the unit base has a thickness in a vertical direction of about 50 mm or more. The refrigerator according to any one of claims 1 to 5, wherein a hole is communicated with an upper portion of the heat insulating box, and a refrigeration unit is installed above the communication hole.

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