JP2008202882A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of improving silence, by having a machine room in a back face upper part. <P>SOLUTION: This refrigerator 1 has the machine room 46 between an inner box 3 composed of a resin mold and an external facing member arranged outside the inner box 3 and arranging a cooling system 101 in the back face upper part of a thermal insulation box body 10 filled with a foaming thermal insulation material 5. A thermal insulation wall 46a around the machine room 46 is provided with a shielding member 161 including the external facing member composed of a machine room box 8, the foaming thermal insulation material 5 and the inner box 3 and surrounding the machine room 46, and is formed larger in surface density of the shielding member 161 than surface density M of the total of the machine room box 8, the foaming thermal insulation material 5 and the inner box 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a refrigerator such as a refrigerator equipped with a machine room at the upper back.

  A conventional refrigerator is disclosed in Patent Document 1. 20 and 21 show a side sectional view and a rear view of the refrigerator. The refrigerator 1 has a heat insulating box 10 that forms a main body casing. The heat insulation box 10 has an inner box 3 made of a resin molded product inserted in an outer box 2 made of sheet metal, and a gap between the outer box 2 and the inner box 3 is filled with a foam heat insulating material 5 such as hard urethane. . A refrigerator compartment 105, an ice making compartment 108, a vegetable compartment 107, and a freezer compartment 106 are divided from above by the heat insulating box 10, and each can be opened and closed by a door.

  A recess 10a is provided on the upper back of the heat insulating box 10, and a machine room 46 is formed by the recess 10a. In the machine room 46, a compressor 88, a condenser 82, a machine room fan 83, a decompressor 84, and a dryer 85 are arranged. A condenser 82, a decompressor 84, a dryer 85, and a cooler 88 disposed behind the vegetable compartment 107 are sequentially connected to the compressor 88 to constitute a cooling device. The refrigeration cycle is operated by driving the compressor 88, and cold air is generated. The machine room fan 83 cools the condenser 82 and the compressor 88.

  The periphery of the machine room 46 is surrounded by a heat insulating wall 10 b formed by the heat insulating box 10. The heat insulating wall 10b is filled with a foam heat insulating material 5 having a thickness of 15 to 50 mm between an outer box 2 and an inner box 3 made of ABS resin having a thickness of about 2 mm, for example. A vacuum heat insulating material 87 having a core material made of an inorganic material is fixed to the inner surface side of the outer box 2 on the front surface and the bottom surface of the machine chamber 46. Therefore, the heat insulating wall 10b around the machine room 46 has a four-layer structure. A similar vacuum heat insulating material 86 is also disposed on the lower back side of the machine room.

  When the compressor 88 is driven, the machine room fan 83 is driven in synchronization therewith. The sound generated from the machine room 46 by the compressor 88 and the machine room fan 83 is transmitted to the refrigerating room 105 through the heat insulating wall 10b. The upper refrigeration room 105 is frequently used, and the user uses it with his / her face close, so that the user feels uncomfortable when the noise in the machine room 46 is transmitted. Since the inside of the vacuum heat insulating material 87 is formed in a vacuum, the noise in the machine chamber 46 can be attenuated to reduce discomfort.

Japanese Patent Laying-Open No. 2006-125686 (pages 5 to 7, FIG. 1)

  However, in recent years, the demand for quietness in refrigerators has become stricter, and it has become difficult to satisfy market demand in the conventional refrigerator 1. Moreover, the same problem arises not only in the refrigerator 1 but also in a refrigerator such as a freezer having a cooling device.

  An object of this invention is to provide the refrigerator which equips a back surface upper part with a machine room and can improve silence.

  In order to achieve the above object, the present invention provides a cooling device on the upper back of a heat insulating box body filled with a foam heat insulating material between an inner box made of a resin molded product and an exterior member disposed outside the inner box. In a refrigerator having a machine room to be disposed, a heat insulating wall around the machine room includes the exterior member, the foam heat insulating material, and the inner box, and a shielding member surrounding the machine room is provided, and the shielding member The surface density is larger than the total surface density of the exterior member, the foamed heat insulating material, and the inner box.

  According to this configuration, the machine room is formed in the upper part of the back surface of the heat insulating box, and the cooling device is arranged in the machine room. The wall surface of the machine room is composed of a heat insulating wall filled with a foam heat insulating material between the exterior member and the inner box and provided with a shielding member. At this time, the surface density of the shielding member is larger than the total surface density of the exterior member, the inner box, and the foam heat insulating material. Sound generated from the machine room is insulated by the heat insulating wall.

  According to the present invention, in the refrigerator having the above-described configuration, the shielding member includes a plurality of metal plates arranged in parallel via an elastic body.

  Further, the present invention is characterized in that the shielding member is formed in a net shape in the refrigerator having the above configuration.

  According to the present invention, in the refrigerator having the above-described configuration, the shielding member is integrally formed in a box shape covering the periphery of the machine room.

  The present invention also includes a machine room in which a cooling device is disposed at the upper back of a heat insulating box body filled with a foam heat insulating material between an inner box made of a resin molded product and an exterior member disposed outside the inner box. In the refrigerator, the exterior member is made of a shielding member surrounding the machine room, and the heat insulating wall around the machine room includes the shielding member, the foam heat insulating material, and the inner box, and the surface density of the shielding member Is larger than the total surface density of the foam insulation and the inner box.

  According to this configuration, the machine room is formed in the upper part of the back surface of the heat insulating box, and the cooling device is arranged in the machine room. The wall surface of the machine room is composed of a heat insulating wall filled with a foam heat insulating material between the shielding member and the inner box. At this time, the surface density of the shielding member is larger than the total surface density of the inner box and the foam heat insulating material. Sound generated from the machine room is insulated by the heat insulating wall.

  According to the present invention, in the refrigerator configured as described above, the shielding member is made of a metal that is integrally formed in a box shape covering the periphery of the machine room.

  According to the present invention, in the refrigerator having the above-described configuration, the cooling device includes a Stirling refrigerator, and the Stirling refrigerator is disposed in the machine room.

  According to the present invention, in the cooler configured as described above, the cooling device includes a compressor, and the compressor is arranged in the machine room.

  According to the present invention, since the surface density of the shielding member disposed around the machine room is larger than the total surface density of the exterior member, the foam heat insulating material, and the inner box, the sound transmission loss can be remarkably increased. Therefore, the quietness of the refrigerator can be improved. Thus, even if a machine room is provided behind the upper storage room that is used frequently and used by the user close to the face, the user is not uncomfortable, and satisfies the market demand for quietness for the refrigerator. be able to.

  Further, according to the present invention, since the shielding member is composed of a plurality of metal plates arranged in parallel via the elastic body, the cooling chamber can be easily made quiet.

  Further, according to the present invention, since the shielding member is formed in a net shape, it is possible to insulate a sound with a small transmission loss and a low frequency and a long wavelength. Further, since the foamed heat insulating material easily flows, the foamed heat insulating material can be easily filled and the weight can be reduced.

  Further, according to the present invention, since the shielding member is integrally formed in a box shape that covers the periphery of the machine room, it is possible to prevent the occurrence of a gap in the shielding member between the orthogonal wall surfaces of the machine room and to further improve quietness. Can do.

  Further, according to the present invention, since the surface density of the shielding member constituting the exterior member arranged around the machine room is larger than the total surface density of the foam heat insulating material and the inner box, the sound transmission loss can be remarkably increased. it can. Therefore, the quietness of the refrigerator can be improved.

  Further, according to the present invention, since the shielding member is made of metal that is integrally formed in a box shape that covers the periphery of the machine room, it is possible to prevent the occurrence of a gap between the shielding members and to easily make the cooling chamber quiet. .

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a front view of the refrigerator of the first embodiment. The refrigerator 1 has heat insulating doors 20 and 21 arranged on the upper and lower sides thereof. The heat insulating doors 20 and 21 can be opened to the left and right with a position biased leftward with respect to the center, with hinges provided at the left and right ends of the refrigerator 1 as the center. An operation unit 25 for setting the temperature of each part in the storage chamber is provided below the heat insulating door 20.

  Below the heat insulating door 20, heat insulating doors 24 and 22 are juxtaposed in the vertical direction, and can be opened to the left with the hinge provided at the left end of the refrigerator 1 as a center. A heat insulating door 23 is provided below the heat insulating door 21 and can be opened rightward with a hinge provided at the right end of the refrigerator 1 as a center.

  FIG. 2 is a front view showing a state in which the heat insulating doors 20 to 24 of the refrigerator 1 are omitted. The refrigerator 1 has a heat insulating box 10 that forms a main body casing. The heat insulating box 10 has an inner box 3 made of a resin molded product inserted in an outer member such as an outer box 2 described later in detail, and a foam heat insulating material 5 (see FIG. 4) in the gap between the outer member and the inner box 3. Is filled.

  Inside the heat insulating box 10, a plurality of storage chambers whose front surfaces are opened are formed by the inner box 3. That is, the inside of the heat insulation box 10 is partitioned up and down by the horizontal partition wall 11. The upper part of the horizontal partition wall 11 is divided into left and right by a vertical partition wall 12 to form a left refrigerator compartment 15 and a right refrigerator compartment 16. The front surfaces of the left refrigerator compartment 15 and the right refrigerator compartment 16 are opened and closed by heat insulating doors 20 and 21 (see FIG. 1), respectively.

  A lower part of the horizontal partition wall 11 is divided into left and right by a vertical partition wall 13, and a right freezer compartment 18 is formed on the right side. The left side of the vertical partition wall 13 is further divided up and down by a horizontal partition wall 14 to form a multi chamber 19 and a left freezing chamber 17. The multi-chamber 19 can be used as a refrigerator or a freezer by switching the room temperature. The front surfaces of the left freezer compartment 17, the right freezer compartment 18, and the multi compartment 19 are opened and closed by heat insulating doors 22, 23, and 24 (see FIG. 1), respectively.

  A drawer-type refrigerated food case 31 is disposed in the lower part of the left refrigeration chamber 15. The upper part of the refrigerated food case 31 is divided into three stages in the vertical direction by the shelf 30. Drawer-type refrigerated food cases 33 and 34 are arranged in the lower part of the right refrigeration chamber 16 so as to overlap in two stages. The upper part of the refrigerated food case 33 is divided into three stages in the vertical direction by the shelf 32. The refrigerated food cases 33 and 34 are partitioned by a partition cover 35 (see FIG. 3). Further, a water supply tank 45 for ice making is arranged on the right side of the refrigerated food case 34.

  In the left freezer compartment 17, drawer-type frozen food cases 40 a and 40 b that overlap in two upper and lower stages are arranged. In the right freezer compartment 18, drawer-type frozen food cases 41 a, 41 b, 41 c that overlap in three upper and lower stages are arranged. A multi-use food container 42 is provided in the multi-chamber 19.

  FIG. 3 shows a right side cross-sectional view of the refrigerator 1 in a cross section passing through the right refrigerator compartment 16 and the right freezer compartment 18. On the upper surface of the heat insulating box 10, an electrical box 81 that houses the control unit 80 (see FIG. 8) is disposed. An illumination panel 38 having an LED light source is provided on the upper back of the right refrigerator compartment 16 to illuminate the inside of the right refrigerator compartment 16. On the inner surface of the heat insulating door 21, a rack 36 for storing bottles, paper packs for beverages and the like is attached.

  The lowermost shelf 32a of the right refrigerator compartment 16 has a depth dimension larger than that of the upper shelf 32, and an independent refrigerator compartment 16a is formed between the partition cover 35 covering the upper surface of the refrigerator food case 34. In addition, an independent refrigerator compartment 16 b is formed below the partition cover 35. The independent refrigerator compartments 16 a and 16 b are isolated in the right refrigerator compartment 16 and maintained at a temperature different from that of the upper portion of the right refrigerator compartment 16.

  An ice making unit 43 that makes ice by supplying water from a water supply tank 45 (see FIG. 2) is disposed on the ceiling of the right freezer compartment 18. Ice produced by the ice making unit 43 is stored in an ice container 44 (see FIG. 2) disposed in the frozen food case 41a.

  A cold air duct 50 is provided on the back surface of the right freezer compartment 18. In the cold air duct 50, the low temperature side evaporator 132 maintained at low temperature by the cooling system 100 (refer FIG. 8) mentioned later is arrange | positioned. The air flowing through the cold air duct 50 exchanges heat with the low temperature evaporator 132 to generate cold air.

  A defrost heater 77 is disposed below the low temperature side evaporator 132. A funnel-shaped drain pipe 78 is provided below the defrosting heater 77, and the lower end of the drain pipe 78 opens on a drain pan 153 disposed outside the heat insulating box 10. Thereby, the low temperature side evaporator 132 is defrosted by driving of the defrost heater 77, and the drain water is dripped onto the drain pan 132 through the drain pipe 78. The drain water accumulated in the drain pan 132 is evaporated by the air from the drain evaporation fan 154 and the heat from the high-temperature pipe 152 (see FIG. 8) described later.

  In front of the cold air duct 50, a cold air duct 51 communicating with the cold air duct 50 through a freezer compartment fan 53 is provided. In the lower part of the cold air duct 50, an air inlet 52 is formed which sucks air flowing out from each storage chamber and returns it to the low temperature side evaporator 132.

  Above the cold air duct 51, a cold air duct 54 that communicates with the cold air duct 51 via the cold room discharge damper 55 is disposed. A cold room fan 56 is provided in the cold air duct 54. The cold air duct 54 is bent from the back surface of the right refrigerator compartment 16 and extends into the vertical partition wall 12 (see FIG. 2).

  The cold air duct 54 in the vertical partition wall 12 is formed in a U-shape projecting upward, and has an ascending passage 54U, a horizontal passage 54H, and a descending passage 54D. The cold air rises in the ascending passage 54U and descends in the descending passage 54D. In the ascending passage 54U, a plurality of cool air discharge ports 57 for discharging cool air to the right refrigerator compartment 16 are formed at predetermined intervals in the vertical direction. A plurality of cool air discharge ports 58 for discharging cool air to the left refrigerator compartment 15 are formed in the descending passage 54D at predetermined intervals in the vertical direction.

  A transverse cold air duct 61 branches off from the upper end of the rising passage 54U. The transverse cold air duct 61 is horizontally disposed along the corner portion at the back of the ceiling of the right refrigerator compartment 16. In the horizontal cold air duct 61, a plurality of cold air discharge ports 62 (see FIG. 6) for discharging cold air to the right refrigerator compartment 16 are formed at predetermined intervals in the horizontal direction.

  Further, the cold air duct 54 branches off from the horizontal cold air duct 59 before entering the vertical partition wall 12. The transverse cold air duct 59 is horizontally disposed along the lower surface of the lowermost shelf 32. In the horizontal cold air duct 61, a plurality of cold air discharge ports 60 (see FIG. 6) for discharging cold air into the refrigerated food case 33 of the independent refrigerator compartment 16a are formed at intervals in the horizontal direction.

  FIG. 4 is a right side cross-sectional view of the refrigerator 1 having a cross section passing through the left refrigerator compartment 15 and the left freezer compartment 19. FIG. 5 is a cross-sectional view taken along the line AA in FIG. A machine room 46 is formed behind the left refrigerator compartment 15 by a recess 10 a provided in the heat insulating box 10. The exterior member of the heat insulation box 10 includes an outer box 2, a back plate 4, a bottom plate 9, and a machine room box 8 (see FIG. 10).

  The outer box 2 is made of a metal plate and is bent to cover the top surface and both side surfaces of the heat insulating box 10. The back plate 4 and the bottom plate 9 are made of metal plates and are attached to the outer box 2 to cover the back and bottom surfaces of the heat insulating box 10, respectively. The machine room box 8 is formed of a box-shaped resin molded product having an upper surface and a back surface opened, and is hooked on the outer box 2 and the back plate 4 and disposed on the recess 10a. Thereby, the machine room 46 is formed, and the Stirling refrigerator 110 of the cooling system 100 (see FIG. 8) described later is disposed in the machine room 46.

  A downlight 37 having an LED light source is provided on the ceiling surface of the left refrigerator compartment 15 to illuminate the interior of the left refrigerator compartment 15. A cold air duct 66 that branches from the cold air duct 51 (see FIG. 3) via the multi-chamber discharge damper 67 (see FIG. 6) is provided on the back surface of the multi-chamber 19. A multi-chamber fan 68 and a multi-chamber heater 69 are arranged in the cold air duct 66, and a cold air discharge port 70 for discharging cool air to the multi-chamber 19 is provided. A return passage 75 communicating with the intake port 52 (see FIG. 3) is provided below the cold air duct 66. A multi-chamber return damper 76 is provided in the return passage 75.

  6 and 7 show a front view and a block diagram for explaining the flow of the cold air in the refrigerator 1. A through hole 74 is provided in the lower part of the vertical partition wall 12 to allow the left refrigerator compartment 15 and the independent refrigerator compartment 16b of the right refrigerator compartment 16 to communicate with each other. The cold air flowing through the left refrigerator compartment 15 flows into the independent refrigerator compartment 16b through the through hole 74. In the lower right part of the right refrigeration chamber 16, a return passage 71 is provided that opens outflow ports 72 and 73 to the independent refrigeration chambers 16a and 16b. The return passage 71 communicates with the intake port 52 (see FIG. 3), and returns the cold air flowing through the right refrigerator compartment 16 to the low temperature side evaporator 132.

  In the cold air duct 51 on the back side of the right freezer compartment 18, the aforementioned cold air ducts 54 and 66 are branched, and the cold air duct 63 is branched. The cold air duct 63 is provided with a left freezer compartment discharge damper 64, and the cold air is discharged into the left freezer compartment 17 through the cold air outlet 65 by opening and closing the left freezer compartment discharge damper 64. The cool air duct 51 is also formed with a cool air discharge port (not shown) for directly discharging cool air to the right freezer compartment 18. The cold air that has circulated in the right freezer compartment 18 returns to the low-temperature side evaporator 132 via the intake port 52.

  A passage (not shown) for guiding the cold air flowing out from the left freezer compartment 17 to the return duct 75 is formed. As a result, the cold air flowing through the left freezer compartment 17 returns to the low temperature side evaporator 132 via the intake port 52.

  When the freezer compartment fan 53 is driven, cold air generated by the low temperature side evaporator 132 is discharged to the right freezer compartment 18. As will be described in detail later, the cooling system 100 (see FIG. 8) of the present embodiment can set the cold air temperature to about −40 ° C., which is lower than that of a normal compressor type cooling system. For this reason, the right freezer compartment 18 from which the cool air blows directly from the freezer compartment fan 53 can reduce the room temperature to about −40 ° C.

  Further, an ice making fan (not shown) provided in the ice making unit 43 performs ice making by blowing this cold air on water. For this reason, ice making can be performed rapidly. The cold air flowing through the right freezer compartment 18 returns to the low temperature side evaporator 132 via the intake port 52. In addition, by suppressing the refrigerating capacity of the cooling system 100, a cold air temperature of about −18 ° C. can be obtained.

  Cold air flows into the left freezer compartment 17 via the left freezer compartment discharge damper 64. The left freezer compartment 17 can control the amount of cool air flowing in by adjusting the opening degree of the left freezer compartment discharge damper 64. For this reason, irrespective of the temperature of the right freezer compartment 18, the temperature of the left freezer compartment 17 can be maintained at -18 ° C, which is a normal freezing temperature. The cold air flowing through the left freezer compartment 17 returns to the low-temperature side evaporator 132 through the return passage 75.

  Cold air flows into the multi-chamber 19 through the multi-chamber discharge damper 67 and is used in a wide temperature range from a chilled temperature to a freezing temperature of −18 ° C. The temperature adjustment of the multi-chamber 19 is performed by controlling the amount of cold air flowing through the multi-chamber discharge damper 67 and the multi-chamber return damper 76. Further, the multi-chamber heater 69 is driven as necessary to raise the temperature of the room, and the multi-chamber 19 is temperature-controlled. The cold air flowing through the multi-chamber 19 returns to the low temperature side evaporator 132 through the multi-chamber return damper 76 and the return passage 75.

  Since the multi-chamber 19 is also used for thawing frozen food, the temperature difference from the right freezer compartment 18 may increase. In order to prevent the high temperature of the multi-chamber 19 from affecting the right freezer compartment 18, the vertical partition wall 13 has a particularly thick heat insulating layer between the multi-chamber 19 and the right freezer compartment 18. Further, the return passage 75 is provided independently from the right freezer compartment 18 so that air returning from the multi-chamber 19 to the intake port 52 does not enter the right freezer compartment 18.

  Cold air is fed into the left refrigerator compartment 15 and the right refrigerator compartment 16 through the cold air duct 54 by driving the refrigerator compartment fan 56. The amount of cold air is adjusted by the refrigerator discharge damper 55 so that the left refrigerator compartment 15 and the right refrigerator compartment 16 are not overcooled. The cold air flowing through the cold air duct 54 is discharged from the cold air discharge port 57 to the right refrigerator compartment 16 while ascending the ascending passage 54U. Since a plurality of the cold air discharge ports 57 are formed at a predetermined interval in the vertical direction above the independent refrigeration chamber 16a, the right refrigeration chamber 16 is uniformly cooled.

  A part of the cold air flowing through the rising passage 54U flows into the horizontal cold air duct 61 near the upper end and is discharged from the cold air discharge port 62. Since a plurality of the cold air discharge ports 62 are formed at predetermined intervals in the horizontal direction, the upper side of the independent refrigerator compartment 16a is cooled more uniformly.

  The cold air flowing into the descending passage 54D from the ascending passage 54U through the horizontal passage 54H is discharged from the cold air discharge port 58 to the left refrigerator compartment 15 while descending the descending passage 54D. Since the plurality of cold air discharge ports 58 are formed at predetermined intervals in the vertical direction, the left refrigerator compartment 15 is uniformly cooled.

  As the cold air flowing through the rising passage 54U rises, the cold air is indirectly discharged to the left refrigerator compartment 15 and the right refrigerator compartment 16. Thereby, since the temperature of the cold air is increased, the temperature of the left refrigerator compartment 15 becomes higher than the temperature of the right refrigerator compartment 16.

  By providing the cold air ducts (54U, 54D) by effectively utilizing the internal space of the vertical partition wall 12, the depth of the left refrigerator compartment 15 and the right refrigerator compartment 16 can be expanded. Further, since the cool air is discharged from the ascending passage 54U to the right refrigerator compartment 16 and the cool air is discharged from the descending passage 54D to the left refrigerator compartment 15, a temperature difference can be easily provided between the right refrigerator compartment 16 and the left refrigerator compartment 15. it can.

  The cold air flowing through the cold air duct 54 flows into the transverse cold air duct 59 before flowing into the ascending passage 54U. The cold air that has entered the transverse cold air duct 59 is discharged from a plurality of cold air discharge ports 60 that are arranged at predetermined intervals in the horizontal direction, and uniformly cools the independent refrigerator compartment 16a. By adjusting the amount of cold air discharged from the cold air duct 59, it can be used as a chilled room or an ice greenhouse lower in temperature than the upper right refrigerator compartment 16. The amount of cold air can be adjusted by the cross-sectional area of the transverse cold air duct 59, the opening area of the cold air outlet 60, and the like. Further, a damper may be provided in the lateral cold air duct 59.

  Return air from the left refrigerator compartment 15 flows into the independent refrigerator compartment 16b through the through hole 74. Since the return air from the left refrigerator compartment 15 whose temperature is higher than that of the right refrigerator compartment 16 flows, the temperature of the independent refrigerator compartment 16b is increased. Thereby, the independent refrigerator compartment 16b can be utilized as a storage space for vegetables.

  Moreover, the partition cover 35 (refer FIG. 3) seals the upper surface opening part of the refrigerated food case 34. FIG. Thereby, the inside of the refrigerated food case 34 is prevented from evaporating moisture of the food, and becomes a more suitable space for storing vegetables. The cold air flowing through the upper part of the right refrigerator compartment 16 and the independent refrigerator compartments 16 a and 16 b returns from the outlets 72 and 73 to the low temperature side evaporator 132 through the return passage 71.

  FIG. 8 shows a configuration diagram of the cooling system 100 (cooling device) of the refrigerator 1. FIG. 9 is a perspective view showing the arrangement of the cooling system 100. The cooling system 100 has a Stirling refrigerator 110. The Stirling refrigerator 110 operates a reverse Stirling cycle by circulation of an internal working medium (primary refrigerant). As a result, the high temperature head 111 is held at a high temperature, and the low temperature head 112 is held at a low temperature.

  The Stirling refrigerator 110 is installed in a so-called vertical position in which a low-temperature head 112 is disposed below a high-temperature head 111. Thereby, since heat released upward from the high temperature head 111 does not interfere with the low temperature head 112, heat loss can be reduced.

  The cold heat generated in the low temperature head 112 is naturally circulated through the secondary refrigerant by the loop thermosyphon type low temperature side circulation circuit 130 and is transported by heat. Since the low-temperature side circulation circuit 130 is a thermosiphon type, the condensed secondary refrigerant flows down due to gravity, and a liquid refrigerant recirculation member is not required, thereby reducing costs. Further, since the air flow channel and the liquid flow channel are separated into a loop shape, the liquid flow is not returned by the air flow, and the heat transport limit can be improved. Carbon dioxide or the like is enclosed as a secondary refrigerant in the low temperature side circulation circuit 130.

  The low temperature side circulation circuit 130 includes a low temperature side condenser 131, a low temperature side evaporator 132, and a secondary refrigerant pipe 133. The low temperature side condenser 131 is thermally connected so as to transfer heat to the low temperature head 112, and condenses the secondary refrigerant by cooling the low temperature head 112.

  The low temperature side evaporator 132 has a large number of heat absorbing fins 132b mounted on a meandering pipe 132a, and is arranged in the cooling duct 50 (see FIG. 3) as described above. The low temperature side evaporator 132 exchanges heat with the air in the cooling duct 50, the secondary refrigerant evaporates, and cold air is generated. The pipe 132a and the heat-absorbing fin 132b are made of a metal material having good heat conductivity such as copper or copper alloy.

  The secondary refrigerant pipe 133 connects the low temperature side condenser 131 and the low temperature side evaporator 132, and has a liquid phase pipe 133L and a gas phase pipe 133G. In the liquid layer pipe 133L, the liquid secondary refrigerant condensed by the low temperature side condenser 131 flows down due to gravity. In the gas-phase pipe 133G, the gaseous secondary refrigerant evaporated by the low-temperature side evaporator 132 rises.

  The heat generated in the high temperature head 111 is transported by heat by naturally circulating the secondary refrigerant by the loop type thermosiphon type high temperature side first circulation circuit 120 as in the low temperature side circulation circuit 130. Water, hydrocarbon-based brine, or the like is enclosed as a secondary refrigerant of the high temperature side first circulation circuit 120.

  The high temperature side first circulation circuit 120 includes a high temperature side evaporator 121, a high temperature side condenser 122, and a secondary refrigerant pipe 123. The high temperature side evaporator 121 is thermally connected so as to transfer heat to the high temperature head 111, and evaporates the secondary refrigerant by the heat of the high temperature head 111. The high temperature side evaporator 121 is formed of a metal having a good thermal conductivity such as copper, copper alloy, or aluminum in a hollow ring shape, and is fitted to the outer peripheral surface of the high temperature head 111.

  The high temperature side condenser 122 is disposed above the Stirling refrigerator 110, and the high temperature side condenser 122 is provided with a number of heat absorbing fins 122b on a meandering pipe 122a. By driving the heat dissipating fan 124 adjacent to the high temperature side condenser 122, the high temperature side condenser 122 dissipates heat to the outside air and the secondary refrigerant is condensed. The pipe 122a and the heat absorbing fins 122b are made of a metal material having good heat conductivity such as copper or a copper alloy.

  The secondary refrigerant pipe 123 connects the high temperature side evaporator 121 and the high temperature side condenser 122 and has a liquid phase pipe 123L and a gas phase pipe 123G. In the liquid layer pipe 123L, the liquid secondary refrigerant condensed by the high temperature side condenser 122 flows down due to gravity. In the gas phase pipe 123G, the gaseous secondary refrigerant evaporated by the high temperature side evaporator 121 rises.

  The high temperature side first circulation circuit 120 is connected to a high temperature side second circulation circuit 150 for preventing condensation of the heat insulating box 10. The high temperature side second circulation circuit 150 is thermally connected to the gas phase refrigerant pipe 123G of the high temperature side first circulation circuit 120 via the heat exchanger 151. Tertiary refrigerant brine is sealed in the pipe 152 of the high temperature side second circulation circuit 150 in a non-depressurized state. Tertiary refrigerant brine is composed of a mixture of water and antifreeze, and has a low viscosity with a low mixing ratio of antifreeze. Thereby, the circulation amount of the brine is ensured.

  The pipe 152 of the high temperature side second circulation circuit 150 includes a down pipe 152D and an up pipe 152U led out from the heat exchanger 151. The downcomer 152D extends downward from the heat exchanger 151 and enters a drain pan 153 disposed at the bottom of the heat insulating box 10. The pipe 152 meanders in the drain pan 153 and evaporates the drain accumulated in the drain pan 153 by raising the temperature. A drain evaporation fan 154 is disposed on the side of the drain pan 153 so as to further accelerate the evaporation of the drain.

  The pipe 152 exiting the drain pan 153 passes near the surface of the heat insulating box 10 and transfers heat obtained from the high temperature side first circulation circuit 120 via the heat exchanger 151. Thereby, the dew-proof part 160 which is maintained more than a dew point and prevents dew condensation is formed in the heat insulation box 10. The dew proof part 160 is formed on each front edge of the right side wall, left side wall, ceiling wall, bottom wall, horizontal partition wall, and vertical partition wall of the heat insulation box 10.

  As shown in FIG. 9, the dew proof part 160 is configured in two systems in which the pipe 152 is branched at the branch part 155 and joined at the junction part 156. The pipe 152 joined at the junction 156 passes through the suction tank 157 and enters the piezoelectric circulation pump 158 installed at the bottom of the heat insulating box 10. The pipe 152 exiting the circulation pump 158 passes through the discharge tank 159 and then becomes the upstream pipe 152U and returns to the heat exchanger 151. Circulation pump 158 is controlled by control unit 80.

  When the Stirling refrigerator 110 is operated, the temperature of the high temperature head 111 rises and the temperature of the low temperature head 112 falls. As a result, the high-temperature secondary refrigerant flows through the high-temperature side first circulation circuit 120, dissipates heat in the high-temperature side condenser 122, and the secondary refrigerant circulates. Further, the low-temperature secondary refrigerant flows through the low-temperature side circulation circuit 130, and heat is taken away by the low-temperature side evaporator 132 so that the secondary refrigerant circulates.

  FIG. 10 is a side sectional view showing the machine room 46. In the machine room 46, a Stirling refrigerator 110, a high temperature side evaporator 121, a high temperature side condenser 122, a secondary refrigerant pipe 123, a heat radiating fan 124, and a low temperature side condenser 131, which are a part of the cooling system 100 (cooling device). Is housed. After each part is accommodated in the machine room 46, the upper surface opening and the rear surface opening are closed by ventilation grills 145 and 146, respectively.

  The Stirling refrigerator 110 is supported by a support member 140. The support member 140 is a frame having a frame shape attached to the machine room box 8, and is horizontally fixed at a middle height of the machine room 46. An opening (not shown) through which the Stirling refrigerator 110 and the secondary refrigerant pipe 123 of the high-temperature side first circulation circuit 120 are passed is formed inside the support member 140.

  A flange-like mounting leg 114 is integrated with the outer surface of the power unit 113 of the Stirling refrigerator 110 by welding or the like. The mounting legs 114 are formed by sheet metal pressing or die casting. The mounting legs 114 may be formed by injection molding a high-strength synthetic resin material such as MC nylon.

  The Stirling refrigerator 110 is attached by being inserted into the opening of the support member 140 from above so that the low temperature head 112 is disposed below and the high temperature head 111 is disposed above. At this time, a columnar vibration absorber 143 made of an elastic material such as rubber is provided between the support member 140 and the mounting leg 114. Thereby, the vibration of the Stirling refrigerator 110 is absorbed. The high temperature side first circulation circuit 120 is connected to the high temperature head 111 before the Stirling refrigerator 110 is attached to the support member 140.

  The high temperature side condenser 122 is supported above the Stirling refrigerator 110 by being supported by the secondary refrigerant pipe 123. A heat radiating fan 124 is connected to the high temperature side condenser 122. The blowing direction of the heat radiating fan 124 may be a direction in which wind is blown to the high temperature side condenser 122, or may be a direction in which wind is taken in through the high temperature side condenser 122.

  Since the power unit 113 is disposed between the high temperature side evaporator 121 and the high temperature side condenser 122, a difference in height between the high temperature side evaporator 121 and the high temperature side condenser 122 can be increased. As a result, it is possible to improve the heat radiation efficiency by ensuring a level difference sufficient for natural circulation of the secondary refrigerant. Moreover, since the space between the high temperature side evaporator 121 and the high temperature side condenser 122 is used for the arrangement of the power unit 113 of the Stirling refrigerator 110, the space can be effectively used.

  Further, the high temperature side condenser 122 and the heat radiating fan 124 are integrally attached to the Stirling refrigerator 110 by the secondary refrigerant pipe 123. For this reason, in addition to the Stirling refrigerator 110, the vibration absorber 143 also absorbs vibrations of the high-temperature side condenser 122 and the heat dissipation fan 124. Therefore, the vibration of the cooling system 100 can be further reduced.

  The low temperature side circulation circuit 130 is connected to the low temperature head 112 after the Stirling refrigerator 110 is attached to the support member 140. The low temperature side circulation circuit 130 may be connected to the low temperature head 112 when the low temperature head 112 is inserted through the opening of the support member 140.

  In addition, as shown in FIG. 9, you may provide the heat insulating body 144 which covers the low-temperature head 112 and the secondary refrigerant | coolant piping 133. As shown in FIG. The heat insulator 144 can be formed by urethane foaming inside a predetermined space. You may form the heat insulating body 144 combining several foaming urethane blocks.

  The heat insulating wall 46a around the machine room 46 is formed of the heat insulating box 10, and the foam heat insulating material 5 is filled between the machine room box 8 and the inner box 3 of a resin molded product as an exterior member. Further, a vacuum heat insulating material 142 and a shielding member 161 surrounding the machine chamber 46 are provided in the heat insulating wall 46a. The shielding member 161 is fixed to the machine room box 8, and the vacuum heat insulating material 142 is fixed to the shielding member 161.

  The vacuum heat insulating material 142 has a high heat insulating performance by keeping the inside of the packaging material wrapping the core material made of an inorganic material in a vacuum, and is disposed below, in front of and one side of the machine room 46. The vacuum heat insulating material 142 may be disposed on both sides of the machine room 46. The shielding member 161 is disposed below, in front of, and on both sides of the machine room 46. The surface density of the shielding member 161 is larger than the total surface density of the machine room box 8, the foam heat insulating material 5 and the inner box 3 of the heat insulating wall 46a, and is made of, for example, a metal plate.

Noise generated during the operation of the Stirling refrigerator 110 is reflected by the ventilation grills 145 and 146, passes through the heat insulating wall 46a, and leaks into the cabinet. At this time, as shown in Expression (1), a transmission loss TL [dB] corresponding to the noise frequency f [Hz] and the surface density M [kg / m ² ] of the heat insulating wall 46a is generated. Thereby, the noise which permeate | transmits in a warehouse becomes small.

    TL = 18 · log (f · M) −44 (1)

For example, the machine room box 8 is formed of ABS resin having a thickness of 2 mm and the inner box 3 is formed of ABS resin having a thickness of 1 mm, and the foam heat insulating material 5 is formed of hard urethane having a thickness of 30 mm. Thereby, the total surface density M of the machine room box 8, the inner box 3, and the foam heat insulating material 5 becomes 4.1 kg / m ² . In this case, the transmission loss of sound at 140 Hz is 5.7 dB.

When the shielding member 161 is formed of an iron plate having a thickness of 1 mm, the surface density of the shielding member 161 is 7.8 kg / m ² . For this reason, the surface density M of the heat insulating wall 46a including the shielding member 161 (not including the vacuum heat insulating material 142) is 11.9 kg / m ² , and the transmission loss of sound at 140 Hz is remarkably increased to 14.0 dB. Furthermore, if the surface density M of the vacuum heat insulating material 142 is 3.8 kg / m ² , the surface density of the entire heat insulating wall 46a is 15.7 kg / m ² , and the sound transmission loss of 140 Hz is 16.2 dB.

  Therefore, the quietness of the refrigerator 1 can be improved. In addition to the noise of the Stirling refrigerator 101, the noise of the heat radiating fan 124 is reflected inside the machine room 46. However, generally, since the noise of fluid has a high frequency, transmission loss increases, and noise transmitted through the heat insulating wall 46a hardly poses a problem.

  In addition, since the heat generating part of the cooling system 100 arranged in the machine room 46 is adjacent to the left refrigerator compartment 15 having a higher temperature than the left freezer compartment 17 and the right freezer compartment 18, the heat insulating wall 46a can be made thin. Further, as described above, since the left refrigerator compartment 15 is maintained at a higher temperature than the right refrigerator compartment 16, the heat insulating wall 46a can be made thinner. By providing the shielding member 161, it is possible to prevent the deterioration of quietness even if the heat insulating wall 46a is thinned.

  According to the present embodiment, the surface density of the shielding member 161 arranged around the machine room 46 is larger than the total surface density of the exterior member, the foam heat insulating material 5 and the inner box 3 made up of the machine room box 8. Transmission loss can be remarkably increased. Therefore, the quietness of the refrigerator 1 can be improved. Accordingly, even if the machine room 46 is provided behind the upper left refrigeration room 15 that is frequently used and the user uses his / her face close to the user, there is no discomfort to the user, and the market demand for quietness of the refrigerator 1 is achieved. Can be satisfied. Further, since the shielding member 161 is made of a metal plate, the refrigerator 1 can be easily made quiet.

  Next, FIGS. 12 and 13 are a side sectional view and a rear view showing the machine room of the refrigerator of the second embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. In this embodiment, the arrangement of the shielding member 161 provided on the heat insulating wall 46a of the machine room 46 is different. Other parts are the same as those in the first embodiment.

  The shielding member 161 is fixed to the inner box 3 and arranged in the heat insulating wall 46a, and the vacuum heat insulating material 142 is fixed to the machine room box 8 and arranged in the heat insulating wall 46a. Even if it does in this way, the effect similar to 1st Embodiment can be acquired.

  Next, FIGS. 14 and 15 are a side sectional view and a rear view showing the machine room of the refrigerator of the third embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. In this embodiment, a shielding member 162 is provided instead of the shielding member 161 and the vacuum heat insulating material 142 (see FIG. 10) provided on the heat insulating wall 46a of the machine room 46. Other parts are the same as those in the first embodiment.

  The shielding member 162 is composed of a plurality of metal plates 162a and 162b arranged in parallel via an elastic body 162c, and is fixed to the machine room box 8. The elastic body 162c is made of a soft resin or the like, and functions as a damping material that insulates vibrations of the plurality of metal plates 162a and 162b. Further, the surface density of the shielding member 162 is larger than the total surface density of the machine room box 8, the foamed heat insulating material 5, and the inner box 3 of the heat insulating wall 46 a.

For example, when the metal plates 162a and 162b are formed of an iron plate having a thickness of 0.5 mm and the mass of the elastic body 162c is ignored, the surface density of the shielding member 162 is 7.8 kg / m ² . The total surface density of the machine room box 8, the inner box 3, and the foam heat insulating material 5 is 4.1 kg / m ² when formed in the same material and thickness as in the first embodiment.

Further, the vibration is insulated by the elastic body 162c, and the surface density on the machine room box 8 side with respect to the elastic body 162c is 5.9 kg / m ² . At this time, the transmission loss of the 140 Hz sound is 8.5 dB according to the above-described equation (1). The surface density on the inner side with respect to the elastic body 162c is 6.0 kg / m ² . At this time, the transmission loss of sound of 140 Hz is 8.6 dB according to the equation (1). Therefore, the transmission loss of the entire heat insulating wall 46a is 17.1 dB.

Here, if the elastic body 162c is a hard member that can easily transmit vibration, the plurality of metal plates 162a and 162b and the elastic body 162c integrally transmit sound energy (that is, vibration energy). Thereby, since the surface density of the heat insulation wall 46a becomes 11.9 kg / m < ² >, the transmission loss of the sound of 140 Hz will be 14.0 dB.

  That is, the elastic body 162c does not act as a sound absorbing material, but acts as a member that insulates vibration. This phenomenon is more effective as the noise frequency increases. Therefore, the transmission loss TL can be further increased as compared with the first embodiment. Note that the shielding member 162 may be formed by arranging three or more metal plates in parallel via an elastic body. Moreover, you may provide the vacuum heat insulating material 142 (refer FIG. 10) similar to 1st Embodiment.

  Next, FIGS. 16 and 17 are a side sectional view and a rear view showing the machine room of the refrigerator of the fourth embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. In the present embodiment, a shielding member 163 is provided instead of the shielding member 161 and the vacuum heat insulating material 142 (see FIG. 10) provided on the heat insulating wall 46a of the machine room 46. Other parts are the same as those in the first embodiment.

  The shielding member 163 is formed in a net shape made of metal or the like having a large number of openings 163a, and is arranged in the heat insulating wall 46a. The surface density of the shielding member 163 is larger than the total surface density of the machine room box 8, the foamed heat insulating material 5, and the inner box 3 of the heat insulating wall 46 a. A sound with small transmission loss has a low frequency and a long wavelength. Therefore, even if the opening 163a is provided, the sound is insulated and the influence on quietness is small. Therefore, the same effect as the first embodiment can be obtained.

  Moreover, since the foaming heat insulating material 5 becomes easy to flow through the opening part 163a, the foaming heat insulating material 5 can be filled easily. Thereby, it is not necessary to fix the shielding member 163, and man-hours can be reduced. Furthermore, the refrigerator 1 can be reduced in weight. In addition, you may provide the vacuum heat insulating material 142 (refer FIG. 10) similar to 1st Embodiment.

  Next, FIGS. 18 and 19 are a side sectional view and a rear view showing the machine room of the refrigerator of the fifth embodiment. For convenience of explanation, the same parts as those in the first embodiment shown in FIGS. In the present embodiment, a shielding member 164 is provided instead of the shielding member 161, the vacuum heat insulating material 142, and the machine room box 8 (see FIG. 10) provided on the heat insulation wall 46a of the machine room 46. Other parts are the same as those in the first embodiment.

  The shielding member 164 is integrally formed in a box shape with the upper surface and the rear surface opened, and constitutes an exterior member of the recess 10 a of the heat insulating box 10. That is, the shielding member 164 is a machine room box that forms the machine room 46. Further, the surface density of the shielding member 164 is formed to be larger than the total surface density M of the foam heat insulating material 5 and the inner box 3 of the heat insulating wall 46a, and is made of, for example, metal.

  According to the present embodiment, since the surface density M of the shielding member 164 is larger than the total surface density M of the foam heat insulating material 5 and the inner box 3, sound transmission loss can be remarkably increased. Therefore, the quietness of the refrigerator 1 can be improved. Further, since the shielding member 164 is integrally formed in a box shape that covers the periphery of the machine room 46, the occurrence of a gap in the shielding member 164 between the orthogonal wall surfaces of the machine room 46 can be prevented, and quietness can be further improved. it can.

  In addition, you may provide the vacuum heat insulating material 142 (refer FIG. 10) similar to 1st Embodiment. Further, a machine room box 8 (see FIG. 10) similar to that of the first embodiment may be provided, and a shielding member 164 may be provided so as to cover the machine room box 8. At this time, if the surface density M of the shielding member 164 is larger than the total surface density M of the machine room box 8, the foam heat insulating material 5, and the inner box 3, the quietness of the refrigerator 1 is improved as in the first embodiment. be able to.

  In 1st-5th embodiment, although the refrigerator 1 is demonstrated, a freezer may be sufficient. That is, if it is a refrigerator having a cooling device, the same effect can be obtained with the same configuration. Moreover, although the cooling device 29 has the Stirling refrigerator 20, other cooling devices may be used. For example, a cooling device that generates cold air by evaporating the refrigerant with a compressor that operates the refrigeration cycle may be used. At this time, the same effect can be obtained in a refrigerator having a heavy compressor disposed in the machine room 10. Alternatively, the low temperature head 112 may be replaced with a low temperature portion of the Peltier element, and the high temperature head 111 may be replaced with a high temperature portion of the Peltier element.

  INDUSTRIAL APPLICABILITY The present invention can be used for a refrigerator such as a refrigerator or a freezer provided with a machine room at the upper back.

The front view which shows the refrigerator of 1st Embodiment of this invention. The front view which shows the state which removed the heat insulation door of the refrigerator of 1st Embodiment of this invention. Side surface sectional drawing which shows the refrigerator of 1st Embodiment of this invention. Side surface sectional drawing which shows the refrigerator of 1st Embodiment of this invention. Top surface sectional drawing which shows the refrigerator of 1st Embodiment of this invention. The front view explaining the flow of the cold air of the refrigerator of 1st Embodiment of this invention The block diagram explaining the flow of the cold air of the refrigerator of 1st Embodiment of this invention The block diagram which shows the cooling system of the refrigerator of 1st Embodiment of this invention. The perspective view which shows arrangement | positioning of the cooling system of the refrigerator of 1st Embodiment of this invention. Side surface sectional drawing which shows the machine room of the refrigerator of 1st Embodiment of this invention. The rear view which shows the machine room of the refrigerator of 1st Embodiment of this invention Side surface sectional drawing which shows the machine room of the refrigerator of 2nd Embodiment of this invention. The rear view which shows the machine room of the refrigerator of 2nd Embodiment of this invention. Side surface sectional drawing which shows the machine room of the refrigerator of 3rd Embodiment of this invention. The rear view which shows the machine room of the refrigerator of 3rd Embodiment of this invention. Side surface sectional drawing which shows the machine room of the refrigerator of 4th Embodiment of this invention. The rear view which shows the machine room of the refrigerator of 4th Embodiment of this invention. Side surface sectional drawing which shows the machine room of the refrigerator of 5th Embodiment of this invention. The rear view which shows the machine room of the refrigerator of 5th Embodiment of this invention. Side sectional view showing a conventional refrigerator Rear view showing a conventional refrigerator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Outer box 3 Inner box 4 Back plate 5 Foam insulation 8 Machine room box 9 Bottom plate 10 Heat insulation box 10a Recess 11, 14 Horizontal partition wall 12, 13 Vertical partition wall 15 Left refrigerator compartment 16 Right refrigerator compartment 17 left freezer 18 right freezer 19 multi-room 20, 21, 22, 23, 24 heat insulating door 46 machine room 50, 51, 54, 63, 66 cold air duct 54U ascending passage 54D descending passage 59, 61 lateral cold air duct 57 , 58, 60, 62, 65, 70 Cold air outlet 100 Cooling system 110 Stirling refrigerator 111 High temperature head 112 Low temperature head 120 High temperature side first circulation circuit 121 High temperature side evaporator 122 High temperature side condenser 123 Secondary refrigerant piping 124 Heat radiation Fan 125 Duct 130 Low temperature side circulation circuit 131 Low temperature side condenser 132 Low temperature side evaporator 133 Secondary refrigerant piping 150 High-temperature side second circulation circuit 151 Heat exchanger 160 Dew proof part 161-164 Shielding member

Claims (8)

  In a refrigerator equipped with a machine room in which a cooling device is arranged on the back upper part of a heat insulating box filled with a foam heat insulating material between an inner box made of a resin molded product and an exterior member arranged outside the inner box, A heat insulating wall around the machine room includes the exterior member, the foam heat insulating material, and the inner box, and a shielding member that surrounds the machine room is provided, and the surface density of the shielding member is set to the exterior member and the foam heat insulation. A refrigerator having a surface density greater than that of the total of the material and the inner box.   The refrigerator according to claim 1, wherein the shielding member includes a plurality of metal plates arranged in parallel via an elastic body.   The refrigerator according to claim 1 or 2, wherein the shielding member is formed in a net shape.   The refrigerator according to any one of claims 1 to 3, wherein the shielding member is integrally formed in a box shape covering the periphery of the machine room.   In a refrigerator equipped with a machine room in which a cooling device is arranged on the upper back of a heat insulating box filled with a foam heat insulating material between an inner box made of a resin molded product and an exterior member arranged outside the inner box, The exterior member includes a shielding member that surrounds the machine room, and a heat insulating wall around the machine room includes the shielding member, the foam heat insulating material, and the inner box, and the surface density of the shielding member is the foam heat insulating material. And a refrigerator having a surface density greater than the total surface density of the inner box.   6. The refrigerator according to claim 5, wherein the shielding member is made of metal integrally formed in a box shape covering the periphery of the machine room.   The said cooling device has a Stirling refrigerator, The said Stirling refrigerator was distribute | arranged in the said machine room, The refrigerator in any one of Claims 1-6 characterized by the above-mentioned.   The refrigerator according to any one of claims 1 to 6, wherein the cooling device includes a compressor, and the compressor is arranged in the machine room.

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