WO2018225846A1 - 冷凍装置の室外ユニット - Google Patents
冷凍装置の室外ユニット Download PDFInfo
- Publication number
- WO2018225846A1 WO2018225846A1 PCT/JP2018/021961 JP2018021961W WO2018225846A1 WO 2018225846 A1 WO2018225846 A1 WO 2018225846A1 JP 2018021961 W JP2018021961 W JP 2018021961W WO 2018225846 A1 WO2018225846 A1 WO 2018225846A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heat sink
- outdoor unit
- unit
- support
- refrigeration apparatus
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/20—Electric components for separate outdoor units
- F24F1/22—Arrangement or mounting thereof
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/20—Electric components for separate outdoor units
- F24F1/24—Cooling of electric components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Definitions
- This disclosure relates to an outdoor unit of a refrigeration apparatus.
- the problem of the present disclosure is that the fire spreading outside the outdoor unit of the refrigeration apparatus suppresses the spread of fire to the board of the electrical component box, and the cooling function of the heat sink attached to the board is caused by the countermeasure against the spread of fire of the board. It is to suppress the decrease in the.
- the outdoor unit of the refrigeration apparatus includes a substrate on which a heat generating component is mounted, a heat sink fixed to the lower surface of the substrate to cool the heat generating component, and when the heat sink is detached from the substrate.
- a capture member made of metal that receives the detached heat sink, and the capture member has an area in a top view of a portion of the capture member located directly below the heat sink that is less than 10% of an area in the top view of the heat sink. It is configured.
- the capture member is configured so that the area of the capture member located directly below the heat sink is less than 10% of the area of the heat sink when viewed from the top.
- the capture member can be prevented from blocking the airflow flowing through the heat sink disposed on the lower surface of the substrate.
- the outdoor unit of the refrigeration apparatus according to the second aspect of the present disclosure is the outdoor unit according to the first aspect, in which the capture member is disposed with an insulating gap from the heat sink.
- the capture member is arranged with an insulation gap from the heat sink, an insulation gap is formed between the metal capture member and the heat sink during normal operation of the outdoor unit. Has been.
- the outdoor unit of the refrigeration apparatus is the metal housing of the electrical component box having a structure in which the substrate is housed inside and the heat sink is exposed to the outside in the outdoor unit of the first aspect or the second aspect.
- the capturing member further includes a body, and the capturing member includes a projecting portion from which a part of the metal housing projects.
- the protruding portion constituting the capture member is a part of the metal casing, less material is newly added to configure the capture member, and the capture is performed. The trouble of providing the member can be saved.
- the outdoor unit of the refrigeration apparatus is the outdoor unit according to the third aspect, further including a resin support member that is fixed to the metal housing and supports the substrate, and the capture member is a resin support It is configured to support the heat sink when the member melts.
- the capture member supports the heat sink when the resin support member melts, the substrate and the heat sink fall even if the resin support member melts. Can be prevented, and the number of cases that can leave a trace indicating a fire from the outside of the electrical component box can be increased.
- the outdoor unit of the refrigeration apparatus is the outdoor unit according to any one of the first to fourth aspects, wherein the capturing member includes at least one support piece.
- the outdoor unit since at least one support piece is included, it is possible to prevent the airflow flowing downward from the lower surface of the substrate through the heat sink from being obstructed by a large member.
- the outdoor unit of the refrigeration apparatus is the outdoor unit according to any one of the first to fifth aspects, in which the capturing member is configured such that the heat sink removed from the substrate is disposed near the periphery of the heat sink. It is something that is received and supported at one point.
- the outdoor unit since it is received and supported at three places arranged in the vicinity of the periphery of the heat sink, it is easy to make the portion where the capture member supports the heat sink small, and the heat sink It will be easier to install in a place where it will not interfere with the airflow flowing through.
- the outdoor unit of the refrigeration apparatus is the outdoor unit according to any one of the first to fourth aspects, wherein the capturing member includes two support ribs extending along the periphery of the heat sink. It is.
- the two support ribs extend along the periphery of the heat sink, it is easy to install in a place that does not interfere with the airflow flowing through the heat sink.
- the outdoor unit of the refrigeration apparatus is the outdoor unit of any one of the first to seventh aspects, the bell mouth disposed on the front surface of the unit, the bell mouth disposed on the front of the unit, and the rear surface of the unit And a fan for generating an airflow from the rear of the unit toward the front of the unit above the bell mouth.
- the heat sink since the heat sink is arranged above the bell mouth from the rear face of the unit toward the front face of the unit, an air flow for cooling the heat sink enters from the rear of the unit and faces the fan downward from the heat sink. Head over.
- the cost for providing the capture member can be reduced.
- the chance of using the heat sink and the substrate for analysis of the cause of the fire can be increased.
- a sufficient air flow is formed without being obstructed by the capture member, and the cooling capacity of the heat sink is easily secured.
- FIG. 1 The front view which shows the outdoor unit of FIG. 1 in the state which removed the grid, the heat exchanger, etc.
- FIG. The rear view which shows the outdoor unit of FIG. 2 in the state which removed the protection metal net
- the front view of the electrical component box of FIG. The left view of the electrical component box of FIG.
- the disassembled perspective view of the electrical component box of FIG. The conceptual diagram for demonstrating the airflow which flows into the electrical component box of FIG.
- the typical top view which shows the relationship between a heat sink and a support piece.
- the typical top view which shows the relationship between a heat sink and a support rib.
- the typical top view which shows the relationship between a heat sink, a support piece, and a support rib.
- FIG. 1 illustrates an internal state of the outdoor unit of the refrigeration apparatus with the top plate and the like removed according to the embodiment of the present disclosure as viewed from above.
- the outdoor unit 10 includes a casing 20, and includes a fan 31, a heat exchanger 32, and an electrical component box 40 inside the casing 20.
- the outdoor unit 10 also includes other devices such as a compressor, but descriptions of devices that are not important for the content of the invention are omitted.
- FIG. 2 shows the appearance of the outdoor unit when the outdoor unit shown in FIG. 1 is viewed from the front
- FIG. 3 shows the appearance of the outdoor unit when viewed from the back
- FIG. 1 shows a state in which the top plate and a grid provided on the front surface of the unit for safety are removed
- FIGS. 2 and 3 show a heat exchanger arranged on the rear side of the unit. The state where 32, the protection wire mesh, etc. were removed is shown. Since the heat exchanger 32 and the protective wire net are removed, the fan motor base 27 that supports the fan 31 is depicted in FIG.
- the outdoor unit 10 has an appearance based on a rectangular parallelepiped shape having a side along the Z-axis extending in the vertical direction, a side along the Y-axis extending in the front-rear direction, and a side along the X-axis direction extending in the left-right direction.
- a casing 20 is provided.
- a top plate that is bent downward around a rectangular metal plate that is long in the left-right direction (X-axis direction) and short in the front-rear direction (Y-axis direction). Is located on the top surface of the casing 20.
- Metal plates are also arranged on the other five surfaces of the casing 20.
- a circular opening 21a is formed in the central portion of the front plate 21 of the casing 20 disposed on the front surface of the unit.
- the right side plate 22 of the casing 20 arranged on the right side surface of the unit is provided with a connection portion 22a for connecting to an indoor unit (not shown) and circulating the refrigerant.
- the right side plate 22 is bent substantially at a right angle and also covers a part on the rear side of the unit.
- a large rectangular opening 22b is formed on the rear surface of the unit.
- An opening (not shown) for sucking air into the outdoor unit 10 is also formed in the left side plate 24 of the casing 20 disposed on the left side of the unit.
- a bell mouth 25 is provided on the front plate 21 around the circular opening 21a for blowing air from the inside of the outdoor unit 10 to the outside.
- the bottom of the casing 20 is covered with a metal bottom frame 26.
- the fan 31 has a propeller 31a disposed on the bell mouth 25 and a motor (not shown) that drives the propeller 31a to rotate.
- the heat exchanger 32 is arranged from the rear surface of the unit to the left side surface of the unit. Air that is sucked into the interior of the outdoor unit 10 through the opening 22b and the opening of the left side plate 24 passes through the heat exchanger 32. An airflow passing through the heat exchanger 32 is generated by the fan 31. That is, when the fan 31 is driven, an airflow passing through the heat exchanger 32 and the bell mouth 25 is generated from the opening 22b on the rear surface of the unit and the opening on the left side of the unit.
- the heat sink 51 which will be described in detail later, uses this air flow to cool the electrical components housed in the electrical component box 40.
- the electrical component box 40 having the heat sink 51 and the like is disposed near the right side of the unit along the top surface of the casing 20.
- the refrigeration apparatus consumes power by, for example, a compressor (not shown) like an air conditioner including the outdoor unit 10 and the indoor unit (not shown) shown in FIG. It is a device that takes in heat from the heat exchanger 32 or exhausts it.
- the refrigeration apparatus is an apparatus that performs a refrigeration cycle in a refrigerant circuit including the heat exchanger 32.
- the refrigeration apparatus includes, for example, a heat pump water heater that supplies hot water, a refrigerator, and a cooling device that cools the interior of the refrigerator.
- FIG. 4 shows the appearance of the electrical component box 40 as viewed from the upper left.
- FIG. 5 shows the appearance of the electrical component box 40 as viewed from the front side of the unit.
- FIG. 6 shows the appearance of the electrical component box 40 as viewed from the left side of the unit.
- FIG. 7 is an exploded perspective view of the electrical component box 40.
- the electrical component box 40 includes a metal casing 41, a resin support member 42, a printed wiring board 43, a metal lid 44, and a metal heat sink 51.
- the metal casing 41 has a bottom wall 41a covering the bottom surface, and is surrounded by four walls 41b, 41c, 41d, and 41e rising from the bottom wall 41a.
- a wall 41e on the front side of the unit is partly cut out, and a part of the front side of the bottom wall 41a is cut out to form an opening for routing the wiring on the printed wiring board 43.
- the wall 41c on the left side of the unit has a shape that rises vertically upward and then bends in the direction of the left side of the unit and then rises further vertically.
- An opening (not shown) for exposing the heat sink 51 downward from the electrical component box 40 is formed in the horizontal portion of the wall 41c.
- the claw portion 41f is bent in the direction of the right side of the unit after being lowered from the wall 41c.
- the bent tip portion is a support piece 41g.
- the claw portion 41f is disposed on the unit rear surface side of the wall 41c.
- Support pieces 41h and 41i are formed at a portion where the wall 41c rises from the bottom wall 41a.
- the support piece 41h is formed at a location overlapping the support piece 41g in the Y-axis direction. That is, the support piece 41g is located at the same distance from the wall 41e on the front side of the unit as the support piece 41h.
- the support piece 41h is a plate-like member parallel to the XZ plane.
- a support piece 41i is formed at a place where the support piece 41h is translated along the Y-axis toward the wall 41e on the front side of the unit. This support piece 41i is also a plate-like member parallel to the XZ plane.
- These support pieces 41g, 41h, 41i are formed by bending a metal plate forming the metal casing 41.
- the support pieces 41g, 41h, 41i are protruding portions from which a part of the metal casing 41 protrudes. Accordingly, the support pieces 41g, 41h, 41i are integrated with the metal casing 41. Further, the support pieces 41h and 41i have only the same width in the top view as the thickness of the metal plate forming the metal casing 41, and are extremely resistant to an air flow downward from the heat sink 51. Only a small blowing resistance occurs.
- the airflow flowing through the heat sink 51 is indicated by an arrow AR. Since the height of the heat sink 51 is lower than the upper end of the heat exchanger 32 and is in front of the heat exchanger 32, the airflow passing through the heat exchanger 32 toward the front side of the unit is from behind the heat sink 51. enter. And an air current flows between the plurality of fins 51a extending in the front-rear direction (Y-axis direction).
- the above-described support pieces 41g, 41h, and 41i have an area in a top view of a portion located directly below the heat sink 51 so that the airflow flowing through the heat sink 51 has only a slight blowing resistance. It is preferable to be configured to be less than 10% of the area in the top view. In the relationship between the heat sink 51 and the support pieces 41g, 41h, 41i shown in FIG. 9, this ratio is less than 5%. Naturally, in the top view, the ratio of the area of the support pieces 41g, 41h, 41i to the area of the heat sink 51 is larger than 0%.
- the support gaps 41g, 41h, and 41i are made of metal, in order to ensure insulation, the support gaps 41g, 41h, and 41i are arranged such that insulating gaps In1 and In2 are formed in the vertical direction between the support pieces 41g, 41h, and 41i. .
- the insulating gaps In1 and In2 are too large, even if the heat sink 51 is received by the support pieces 41g, 41h, and 41i when the heat sink 51 is detached from the printed wiring board 43 and falls down, A large gap is formed between the wiring board 43 and the wiring board 43. When a large gap is formed, the flame easily reaches the printed wiring board 43 through the gap between the heat sink 51 and the printed wiring board 43.
- the insulating gaps In1 and In2 are set to be less than 10 mm.
- the insulating gaps In1 and In2 are set in a range of 4 to 8 mm, for example. Even in the event of a fire, even if the heat sink 51 falls by this amount of the insulation gaps In1 and In2, since the gap between the heat sink 51 and the printed wiring board 43 is small, the intrusion of flame is suppressed. Furthermore, since the periphery of the dropped heat sink 51 is surrounded by the walls 41 b, 41 c, 41 d, the flame is prevented from entering the gap between the dropped heat sink 51 and the printed wiring board 43.
- the resin support member 42 has a frame portion 42a that is formed in a rectangular ring shape when viewed from above, and is formed along the walls 41b, 41c, 41d, and 41e of the metal casing 41. Fit inside 41.
- the resin support member 42 is, for example, screwed to the metal casing 41.
- the resin support member 42 is a member that supports the printed wiring board 43 while being insulated from the metal casing 41 and the lid 44. In a state where the printed wiring board 43 is fitted into the resin support member 42, the resin support member 42 covers the periphery of the printed wiring board 43 like a frame.
- the resin support member 42 also has a function of covering the periphery of the heat sink 51 and insulating the heat sink 51 and the metal casing 41. In order to expose the heat sink 51 attached to the printed wiring board 43 downward, an opening is also formed in the resin support member 42 at a portion overlapping the opening of the wall 41c.
- the printed wiring board 43 has insulating properties, and therefore includes a resin, and is, for example, a mixed member of a resin and a fibrous material.
- a material of the printed wiring board 43 for example, paper phenol, paper epoxy, or glass epoxy is used.
- a heat generating component is mounted on the region 43 a of the printed wiring board 43.
- the heat generating component is a target to be cooled by the heat sink 51, such as an intelligent power module (IPM), a diode bridge, and a power transistor for power control.
- IPM intelligent power module
- a heat sink 51 is attached below the region 43 a of the printed wiring board 43.
- the heat sink 51 is screwed to the printed wiring board 43, for example.
- a heat generating component is attached to the heat sink 51 via a silicon resin.
- the metal lid 44 includes a rectangular upper surface 44a and a rib 44b formed in a ring shape protruding downward from the upper surface 44a.
- the ribs 44 b of the lid 44 are configured to fit on the outer peripheral side of the frame portion 42 a of the resin support member 42.
- the capture member may be constituted by one support rib 41j and one support piece 41g. Furthermore, you may comprise a capture member using four or more support pieces.
- Modification 1A and Modification 1B the case where the support pieces 41g, 41h, 41i and the support ribs 41j, 41k are provided so as to protrude along the left-right direction (X-axis direction) has been described.
- the support piece and the support rib may be provided so as to protrude along the front-rear direction (Y-axis direction), and the protruding direction of the support piece and the support rib is not limited to the above-described direction.
- the heat sink 51 is fixed to the lower surface of the printed wiring board 43 in order to cool the heat generating components.
- the heat sink 51 removed by the support pieces 41g, 41h, 41i or the support ribs 41j, 41k, which are metal capture members. 51 is received.
- the area of the support pieces 41g, 41h, 41i or the support ribs 41j, 41k positioned directly below the heat sink 51 is configured to be 10% or even less than 5% of the area of the heat sink 51 when viewed from the top.
- the support pieces 41g, 41h, 41i or the support ribs 41j, 41k which are capture members, are prevented from blocking the airflow flowing through the heat sink 51 indicated by the arrow AR in FIG.
- the cooling function of the heat sink 51 is prevented from being lowered even if the support pieces 41g, 41h, 41i or the support ribs 41j, 41k are provided.
- the heat sink 51 received by the support pieces 41g, 41h, 41i or the support ribs 41j, 41k can play a role of suppressing the spread of fire to the printed wiring board 43 when the inside of the heat sink burns.
- the support pieces 41g, 41h, 41i or the support ribs 41j, 41k which are protruding portions of the metal casing 41 constituting the capturing member, are part of the metal casing 41, the support pieces 41g, 41h, 41i or In order to provide the support ribs 41j and 41k, for example, a metal plate that is a material of the metal casing 41 can be used by cutting and utilizing a portion that becomes a wall, or a portion that is punched and discarded, Less material needs to be added.
- the support pieces 41g, 41h, 41i or the support ribs 41j, 41k can be provided together when the metal casing 41 is formed by pressing a metal plate, for example, the support pieces 41g, 41h, The trouble of providing 41i or support ribs 41j and 41k can be saved. As a result, in the outdoor unit 10 described above, the cost for providing the capture member can be reduced.
- the capture member includes at least one support piece 41g, 41h, 41i, which is a support piece, it is not necessary to cover a large area under the printed wiring board 43 using a large member. It is possible to prevent the airflow flowing downward from the lower surface through the heat sink 51 from being obstructed by a large member, and it is possible to sufficiently suppress a decrease in the cooling capacity of the heat sink 51.
- the support members 41g, 41h, and 41i receive and support the three pieces arranged in the vicinity of the periphery of the heat sink 51. It becomes easy to make the part which supports 51 small, and it becomes easy to install in the place which does not obstruct the air current which flows into heat sink 51. Therefore, in the outdoor unit 10 described above, it is easy to provide a capture member so as not to hinder the airflow that cools the heat sink 51.
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Abstract
Description
図1には、本開示の実施形態に係る、天板などを取り外した状態の冷凍装置の室外ユニットを、上方から見た室外ユニットの内部の様子が示されている。室外ユニット10は、ケーシング20を備え、そのケーシング20の内部にファン31と熱交換器32と電装品箱40とを備えている。なお、室外ユニット10は、圧縮機などの他の機器も備えているが、発明の内容にとって重要で無い機器の説明は省かれている。
(2-1)電装品箱40
図4には、左斜め上方から見た電装品箱40の外観が示されている。図5には、ユニット前面の側から見た電装品箱40の外観が示されている。図6には、ユニット左側面から見た電装品箱40の外観が示されている。図7は、電装品箱40の分解斜視図である。
金属製筐体41は、底壁41aが底面を覆っており、底壁41aから立ち上がった4つの壁41b,41c,41d,41eによって前後左右が囲まれている。ユニット前面側の壁41eが一部切り欠かれるとともに底壁41aの前面側が一部切り欠かれて、プリント配線基板43に配線を引き回すための開口が形成されている。
樹脂製支持部材42は、上面視において長方形状の環状に形成されている枠部42aを有しており、金属製筐体41の壁41b,41c,41d,41eに沿って、金属製筐体41の内側に嵌り込む。樹脂製支持部材42は、金属製筐体41に例えばビス止めされる。この樹脂製支持部材42は、プリント配線基板43を金属製筐体41及び蓋44から絶縁した状態で支える部材である。樹脂製支持部材42にプリント配線基板43が嵌め込まれた状態では、樹脂製支持部材42がプリント配線基板43の周囲を額縁のように覆っている。また、樹脂製支持部材42は、ヒートシンク51の周囲を覆って、ヒートシンク51と金属製筐体41とを絶縁する機能も有している。プリント配線基板43に取り付けられているヒートシンク51を下方に向って露出させるために、壁41cの開口と重なる部分に、樹脂製支持部材42にも開口が形成されている。
プリント配線基板43は、絶縁性を有しており、そのために樹脂を含むものであって、例えば樹脂と繊維状の材料との混成部材である。プリント配線基板43の材料としては、例えば紙フェノール、紙エポキシ、またはガラスエポキシが用いられる。図示が省略されているが、プリント配線基板43の領域43aの上に発熱部品が実装されている。発熱部品は、ヒートシンク51により冷却される対象であり、例えば、インテリジェントパワーモジュール(IPM)、ダイオードブリッジ及び電力制御用のパワートランジスタなどである。プリント配線基板43の領域43aの下方には、ヒートシンク51が取り付けられている。ヒートシンク51は、プリント配線基板43に例えばビス止めされている。ヒートシンク51には、例えば発熱部品がシリコン樹脂を介して取り付けられている。
金属製の蓋44は、長方形状の上面44aと、上面44aから下向きの突出したリング状に形成されているリブ44bとによって構成されている。蓋44のリブ44bは、樹脂製支持部材42の枠部42aの外周側に嵌るように構成されている。
(3-1)変形例1A
上記実施形態では、火災時にプリント配線基板43から外れるヒートシンク51を、支持片41g,41h,41iによって3箇所で受け止める場合について説明したが、図10に示されている2本の支持リブ41j,41kで受け止めるように構成してもよい。支持リブ41j,41kは、上面視における面積が、ヒートシンク51の上面視における面積の10%未満となるように構成されている。これら支持リブ41j,41kは、金属製筐体41の一部を切り起こして形成することが好ましい。また、図示が省略されているが、支持リブ41j,41kとヒートシンク51との間には、支持片41g,41h,41iと同様に、絶縁隙間が設けられている。
また、図11に示されているように、1本の支持リブ41jと1つの支持片41gとで捕獲部材を構成してもよい。さらには、4つ以上の支持片を用いて捕獲部材を構成してもよい。
上記実施形態、変形例1A及び変形例1Bでは、支持片41g,41h,41i並びに支持リブ41j,41kが左右方向(X軸方向)に沿って突出するように設けられている場合について説明したが、例えば支持片及び支持リブは前後方向(Y軸方向)に沿って突出するように設けられてもよく、支持片及び支持リブの突出する方向が上述の方向に限定されるものではない。
上記実施形態では、ヒートシンク51が1つだけの場合について説明したが、電装品箱40に複数のヒートシンクが設けられている場合に、それぞれのヒートシンクに対して捕獲部材を設けるように構成してもよい。
(4-1)
室外ユニット10において、ヒートシンク51は、発熱部品を冷却するために、プリント配線基板43の下面に固定されている。そして、火災などで室外ユニット10内が燃えてプリント配線基板43の下面からヒートシンク51が外れたときには、金属製捕獲部材である支持片41g,41h,41iまたは支持リブ41j,41kによって、外れたヒートシンク51が受け止められる。ヒートシンク51の真下に位置する支持片41g,41h,41iまたは支持リブ41j,41kの上面視における面積が、ヒートシンク51の上面視における面積の10%、さらには5%未満となるように構成されているから、例えば図8に矢印ARで示されているヒートシンク51に流れる気流を捕獲部材である支持片41g,41h,41iまたは支持リブ41j,41kが妨げることが抑制されている。その結果、室外ユニット10の運転時には支持片41g,41h,41iまたは支持リブ41j,41kが設けられていてもヒートシンク51の冷却機能の低下が抑制されており、さらには例えば火災などで室外ユニット10の内部が燃えたときに、支持片41g,41h,41iまたは支持リブ41j,41kに受け止められたヒートシンク51がプリント配線基板43までの延焼を抑制する役割を果たすことができる。
捕獲部材である支持片41g,41h,41iまたは支持リブ41j,41kがヒートシンク51から絶縁隙間In1,In2を空けて配置されていることから、支持片41g,41h,41iまたは支持リブ41j,41kとヒートシンク51との間で十分な絶縁が行える。その結果、ヒートシンクの真下に金属製の支持片41g,41h,41iまたは支持リブ41j,41kが設けられても、ヒートシンク51と支持片41g,41h,41iまたは支持リブ41j,41kとが接触することによる絶縁不良を防止することができる。
捕獲部材を構成する金属製筐体41の突出部である支持片41g,41h,41iまたは支持リブ41j,41kが金属製筐体41の一部であることから、支持片41g,41h,41iまたは支持リブ41j,41kを設けるために、例えば金属製筐体41の材料である金属板で壁になる部分を切り起こして活用したり打ち抜かれて捨てられる部分を活用したりすることなどができ、新たに追加する材料が少なくて済む。また、例えば金属板をプレス成形するなどして金属製筐体41を成形するときに一緒に支持片41g,41h,41iまたは支持リブ41j,41kを設けることができるので、支持片41g,41h,41iまたは支持リブ41j,41kを設ける手間を省くことができる。その結果、上述の室外ユニット10では、捕獲部材を設けるためのコストが削減できている。
樹脂製支持部材42が融けたときにヒートシンク51を支持片41g,41h,41iまたは支持リブ41j,41kが支えるように構成されていることから、樹脂製支持部材42が融けても基板とヒートシンクが落下するのを防ぐことができ、電装品箱の外側からの出火を示す痕跡を残せるケースを増やすことができる。その結果、室外ユニット10が出火に巻き込まれたときに出火の原因の分析にヒートシンク51とプリント配線基板43を役立てる機会を増やすことができる。
捕獲部材に少なくとも1つの支持片である支持片41g,41h,41iが含まれることから、大きな部材を使ってプリント配線基板43の下の大きな面積を覆わなくても済むので、プリント配線基板43の下面からヒートシンク51を通って下方に抜ける気流が大きな部材によって邪魔されるのを防ぐことができ、ヒートシンク51の冷却能力の低下を十分に抑制することができる。
室外ユニット10の中が万一燃えてヒートシンク51が落ちたとしても、ヒートシンク51の周辺近傍に配置された3つの箇所で支持片41g,41h,41iが受け止めて支持することから、捕獲部材がヒートシンク51を支持する部分を小さく構成することが容易になり、またヒートシンク51に流れる気流の邪魔にならない場所に設置し易くなる。そのため、上述の室外ユニット10では、ヒートシンク51を冷やす気流の妨げにならないように捕獲部材を設けることが容易になっている。
捕獲部材である2本の支持リブ41j,41kがヒートシンク51の周辺に沿って延びることから、ヒートシンク51に流れる気流の邪魔にならない場所に捕獲部材を設置し易くなり、ヒートシンク51を冷やす気流の妨げにならないように捕獲部材を設けることが容易になる。
室外ユニット10では、ヒートシンク51がベルマウス25の上方においてユニット後面からユニット前面に向かって配置されているから、ヒートシンク51を冷やす気流がユニット後方から入ってファン31に向ってヒートシンク51から下方に向う。このような状況において、ヒートシンク51の真下に位置する捕獲部材である支持片41g,41h,41iまたは支持リブ41j,41kの部位の上面視における面積がヒートシンク51の上面視における面積の10%未満となっているから、捕獲部材に邪魔されずに十分な気流が形成されてヒートシンク51の冷却能力を確保し易くなる。
25 ベルマウス
31 ファン
32 熱交換器
40 電装品箱
41 金属製筐体
41g,41h,41i 支持片
41j,41k 支持リブ
42 樹脂製支持部材
43 プリント配線基板
51 ヒートシンク
Claims (8)
- 発熱部品が実装されている基板(43)と、
前記発熱部品を冷却するために前記基板の下面に固定されているヒートシンク(51)と、
前記ヒートシンクが前記基板から外れたときに、外れた前記ヒートシンクを受け止める金属製の捕獲部材(41g,41h,41i,41j,41k)と
を備え、
前記捕獲部材は、前記ヒートシンクの真下に位置する前記捕獲部材の部位の上面視における面積が、前記ヒートシンクの上面視における面積の10%未満となるように構成されている、冷凍装置の室外ユニット(10)。 - 前記捕獲部材は、前記ヒートシンクから絶縁隙間を空けて配置されている、
請求項1に記載の冷凍装置の室外ユニット。 - 前記基板を内部に収納するとともに前記ヒートシンクを外部に露出させる構造を有する電装品箱(40)の金属製筐体(41)をさらに備え、
前記捕獲部材は、前記金属製筐体の一部が突出した突出部を含む、
請求項1または請求項2に記載の冷凍装置の室外ユニット。 - 前記金属製筐体に固定され、前記基板を支持する樹脂製支持部材(42)をさらに備え、
前記捕獲部材は、前記樹脂製支持部材が融けたときに前記ヒートシンクを支えるように構成されている、
請求項3に記載の冷凍装置の室外ユニット。 - 前記捕獲部材は、少なくとも1つの支持片(41g,41h,41i)を含む、
請求項1から4のいずれか一項に記載の冷凍装置の室外ユニット。 - 前記捕獲部材は、前記基板から外れた前記ヒートシンクを、前記ヒートシンクの周辺近傍に配置された3つの箇所で受け止めて支持する、
請求項1から5のいずれか一項に記載の冷凍装置の室外ユニット。 - 前記捕獲部材は、前記ヒートシンクの周辺に沿って延びる2本の支持リブ(41j,41k)を含む、
請求項1から4のいずれか一項に記載の冷凍装置の室外ユニット。 - ユニット前面に配置されているベルマウス(25)と、
前記ベルマウス内に配置され、ユニット後面から前記ユニット前面に向かう気流を発生させるファン(31)と
をさらに備え、
前記ヒートシンクは、前記ベルマウスの上方において前記ユニット後面から前記ユニット前面に向かって配置されている、
請求項1から7のいずれか一項に記載の冷凍装置の室外ユニット。
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