JP2013251328A - Outdoor installation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an outdoor installation device which enables a housing and a heat sink to be securely fixed to each other and maintains high waterproofness and robustness.SOLUTION: An outdoor installation device includes: a housing 1 housing electric components including a heating body; a heat sink 2 radiating heat from the heating body to the exterior of the housing 1; screws 7 serving as fixing parts fixing the heat sink 2 to the housing 1; and sealing members 8 provided between the housing 1 and the heat sink 2 and sealing internal spaces enclosed by the housing 1 and the heat sink 2. Protruding parts 9 protruding to the heat sink 2 side are respectively formed at portions of the housing 1 which face the heat sink 2. The fixing part fixes the heat sink 2 with the protruding parts 9 of the housing 1 placed in contact with the heat sink 2. Each sealing member 8 fills a space between the housing 1 and the heat sink 2 around the protruding part 9.

Description

  The present invention relates to an outdoor installation device.

  2. Description of the Related Art Conventionally, as outdoor equipment, there is a device in which a heating element is brought into direct contact with a heat sink and various electric components including the heating element are covered with a casing. Outdoor installation equipment is provided with waterproofing measures to prevent rainwater and the like from entering electrical components inside the housing. As one of waterproofing measures, there is a method of attaching a sealing member for water stop between a heat sink and a housing. For example, there is an outdoor installation device having a structure in which a gasket is attached to a connection portion between a heat sink and a housing, and the heat sink and the housing are screwed (for example, see Patent Document 1).

Japanese Patent No. 4850933

  As for the outdoor installation apparatus of patent document 1, the heat sink is accommodated in the housing | casing. A slit as a vent hole is provided around the heat sink of the housing to promote heat dissipation to the outside of the housing. In order to improve heat dissipation by the heat sink, the heat sink may be disposed completely outside the housing. In any configuration, since the heat sink is disposed in a place exposed to the outside air, it is necessary to reliably prevent water from entering various electrical components inside the housing, a storage location of the electronic circuit, and the like.

  In a structure in which a sealing member such as butyl rubber is attached to the connection portion between the heat sink and the housing and the heat sink and the housing are screwed, there is a structure in which the sealing member is formed by removing the periphery of the screw. . In a configuration in which the sealing member is formed with a space around the screw, when the screw is tightened, the sealing member compressed by the heat sink and the housing may be stretched to the screw hole. When the sealing member reaches the screw, the screw is easily loosened due to the sealing member being bitten by the screw. When the screws are loosened, not only is it difficult to maintain the waterproofness of the connection portion between the housing and the heat sink, but it is also difficult to maintain the robustness of the outdoor installation equipment.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the outdoor installation apparatus which can fix a housing | casing and a heat sink firmly, and can maintain high waterproofness and robustness.

  In order to solve the above-described problems and achieve the object, the present invention includes a casing that houses an electrical component including a heating element, a heat sink that releases heat from the heating element to the outside of the casing, A fixing portion that fixes the heat sink to a housing; and a sealing member that is provided between the housing and the heat sink and seals an internal space surrounded by the housing and the heat sink; A portion of the housing that faces the heat sink is formed with a protruding portion that protrudes toward the heat sink, and the fixing portion causes the protruding portion of the housing to abut against the heat sink. The sealing member fills a gap between the casing and the heat sink around the protrusion.

  According to the present invention, the projecting portion is sealed to the position of the fixed portion by fixing the housing and the heat sink with the projecting portion formed on the housing in contact with the heat sink. Prevent entry of members. By making it possible to prevent the sealing member from entering the fixing portion by the protruding portion, it is possible to suppress the sealing member from being bitten by the fixing portion and to prevent the fixing portion from loosening. As a result, the outdoor installation device has an effect that the casing and the heat sink can be firmly fixed by the fixing portion, and high waterproofness and robustness can be maintained.

FIG. 1 is a cross-sectional view showing a schematic configuration of an outdoor installation device according to an embodiment of the present invention. FIG. 2 is a top view showing an internal configuration of the housing shown in FIG. FIG. 3 is an enlarged view showing a portion of the configuration shown in FIG. 1 where the housing and the heat sink are fixed by screws. FIG. 4 is a diagram illustrating a comparative example of a portion where the housing and the heat sink are fixed. FIG. 5: is sectional drawing which shows schematic structure of the outdoor installation apparatus concerning the modification of embodiment. FIG. 6 is a block diagram illustrating a schematic configuration of a photovoltaic power generation system including a grid interconnection inverter which is an example of an outdoor installation device.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an outdoor installation device according to the present invention will be described in detail based on the drawings. In addition, this invention is not limited to the following description, In the range which does not deviate from the summary of this invention, it can change suitably. In the drawings shown below, the scale of each member may be different from the actual scale for easy understanding. The same applies between the drawings. Further, even a plan view may be hatched to make the drawing easy to see.

Embodiment.
FIG. 1 is a cross-sectional view showing a schematic configuration of an outdoor installation device according to an embodiment of the present invention. In an outdoor installation device, a semiconductor component 3 that is a heating element is brought into direct contact with a heat sink 2, and various electrical components including the semiconductor component 3 are covered with a casing 1. Of the various electrical components, those other than the semiconductor component 3 are not shown.

  The housing 1 is configured by assembling metal plate members into a box shape. An opening 4 is provided on one side of the box constituting the housing 1. The heat sink 2 includes a plurality of heat radiation fins 5 and a base plate 6 that supports the heat radiation fins 5. The heat sink 2 closes the entire opening 4 with the surface of the base plate 6 opposite to the side on which the radiation fins 5 are formed.

  The semiconductor component 3 is disposed on the surface of the base plate 6 opposite to the side on which the heat dissipating fins 5 are provided. Various electrical components including the semiconductor component 3 are housed in an enclosed internal space that is isolated from the outside by the housing 1 and the heat sink 2.

  The heat sink 2 propagates heat generated in the semiconductor component 3, which is a heating element, from the base plate 6 to the radiation fins 5. The heat sink 2 releases heat to the outside of the housing 1 by heat exchange between the radiating fins 5 and air. The outdoor installation device promotes heat radiation to the outside of the housing 1 by the heat sink 2 by disposing the radiating fins 5 of the heat sink 2 completely outside the housing 1.

  The protruding portion 9 is formed in a portion of the housing 1 around the opening 4 and facing the base plate 6. The protruding portion 9 is configured to protrude from the inside of the housing 1 to the base plate 6 side. For example, the protrusions 9 are arranged in the vicinity of rectangular corners formed by the openings 4.

  FIG. 2 is a top view showing an internal configuration of the housing shown in FIG. A screw 7 as a fixing portion fixes the heat sink 2 to the housing 1 at a protruding portion 9 formed around the opening 4. As shown in FIG. 1, the screw 7 penetrates the protruding portion 9 from the inside of the housing 1 to the base plate 6 side, and the tip is embedded in the base plate 6. The screw hole into which the screw 7 is inserted is formed by penetrating the protruding portion 9 and entering the base plate 6.

  It is assumed that the protruding portion 9 is formed by, for example, drawing processing at a desired position in a portion around the opening 4 of the plate member constituting the housing 1. The protrusion 9 can be easily formed by adding a drawing process to the plate member constituting the housing 1. In addition, the protrusion part 9 is not restricted to what is formed by drawing, It is good also as what is formed by any processing method.

  The sealing member 8 is provided between a portion around the opening 4 in the housing 1 and the base plate 6 of the heat sink 2. The sealing member 8 seals the inside of the housing 1. The sealing member 8 is a member that can sufficiently seal the gap by a repulsive force that resists compression and that has water resistance. As the sealing member 8, for example, butyl rubber is used. The sealing member 8 may be a member other than butyl rubber as long as it can exhibit waterproofness so as to prevent water from entering the inside of the housing 1 from the outside.

  The sealing member 8 functions to prevent rainwater and the like from entering the housing 1 from the connection portion of the housing 1 and the heat sink 2. The outdoor-installed device prevents water from entering various electrical components inside the housing 1 by a waterproof structure using the sealing member 8. Further, the sealing member 8 also has a dustproof function for preventing dust and the like from entering the housing 1 from the connection portion of the housing 1 and the heat sink 2.

  The waterproof structure is configured, for example, by sandwiching a sheet-like sealing member 8 between the housing 1 and the heat sink 2 and tightening the screws 7. It is assumed that the sealing member 8 is thicker than the gap between the housing 1 and the heat sink 2 before being sandwiched between the housing 1 and the heat sink 2. As a result, the sealing member 8 is in close contact with both the housing 1 and the heat sink 2 by a repulsive force that resists compression by the housing 1 and the heat sink 2. By sufficiently sealing the connecting portion of the housing 1 and the heat sink 2 with the sealing member 8, the outdoor installation device can ensure high waterproofness and dustproofness.

  FIG. 3 is an enlarged view showing a portion of the configuration shown in FIG. 1 where the housing and the heat sink are fixed by screws. The screw 7 fixes the protruding portion 9 of the housing 1 by contacting the base plate 6 of the heat sink 2. The sealing member 8 fills the gap between the housing 1 and the base plate 6 around the protruding portion 9.

  FIG. 4 is a diagram illustrating a comparative example of a portion where the housing and the heat sink are fixed. In the comparative example, the portion of the housing 31 that faces the base plate 6 is formed substantially flat. The sealing member 32 is attached by providing a gap 33 around the screw 7 in the gap between the casing 31 and the base plate 6.

  In the comparative example, since the gap 33 is left on the screw 7 side with respect to the sealing member 32, the sealing member 32 compressed by the casing 31 and the base plate 6 can be obtained by tightening the screw 7. It may enter the gap 33 and be extended to the screw hole. When the sealing member 32 reaches the screw 7 and the screw 7 is further tightened, the sealing member 32 is bitten by the screw 7.

  If the screw 7 is in a state in which the sealing member 32 is bitten, the screw 7 is easily loosened due to vibrations caused by transportation of an outdoor installation device, an influence of a thermal cycle, or the like. Thereby, it becomes difficult for outdoor installation equipment to maintain high waterproofness in the connection part of the housing | casing 31 and the base board 6. FIG. Furthermore, if the screw 7 is loosened, the heat sink 2 may fall off from the housing 31. In order to prevent such inconvenience, adjustment is separately required so that the sealing member 32 does not reach the screw hole.

  On the other hand, according to the configuration of the present embodiment shown in FIG. 3, the expansion of the sealing member 8 is caused in the process of tightening the screw 7 by bringing the protrusion 9 into contact with the base plate 6. Will be blocked. By allowing the protrusion 9 to prevent the sealing member 8 from entering the screw 7, it is possible to prevent the sealing member 8 from being bitten by the screw 7 and effectively prevent the screw 7 from loosening. it can. Thereby, an outdoor installation apparatus suppresses the looseness of a fixing | fixed part, and there exists an effect that high waterproofness and robustness can be maintained.

  In the outdoor installation device, the manner in which the fixed portion and the protruding portion 9 are arranged is not limited to that described in the present embodiment, and can be changed as appropriate. For example, the screw 7 and the protruding portion 9 may be provided at a position other than the position facing the corner of the opening 4 in the housing 1. The number of screws 7 and protrusions 9 is not limited to four, and may be changed as appropriate. As the fixing portion, any structure capable of fixing the casing 1 and the heat sink 2 while compressing the sealing member 8 may be applied.

  The outdoor installation device may be any device as long as the heat radiating fins 5 are exposed to the outside air in the heat sink 2. The position where the heat sink 2 is disposed with respect to the housing 1, the range occupied by the heat sink 2 with respect to the housing 1, etc. It shall be optional. The configuration of the connection portion between the housing 1 and the heat sink 2 is not limited as long as the protruding portion 9 of the housing 1 is in contact with the heat sink 2 and may be appropriately modified.

  FIG. 5: is sectional drawing which shows schematic structure of the outdoor installation apparatus concerning the modification of embodiment. The housing 11 is configured by assembling metal plate members into a box shape and opening one surface of the box body. The heat sink 2 is fitted into the open portion of the housing 11.

  The heat sink 2 has a side plate 12 that stands upright with respect to the base plate 6. The side plate 12 constitutes the outline of the heat sink 2 and surrounds the heat radiating fins 5. The heat sink 2 is connected to the housing 11 with the radiating fins 5 facing the outside of the housing 11. Also in this modified example, the outdoor-installed device promotes heat radiation to the outside of the housing 11 by the heat sink 2 by disposing the radiating fins 5 of the heat sink 2 outside the housing 11.

  The protruding portion 9 is formed in a portion of the housing 11 that faces the side plate 12 near the open end. The protruding portion 9 is configured to protrude from the outside of the housing 11 to the side plate 12 side. For example, the protruding portions 9 are arranged in the vicinity of the four corners of the housing 11 when the housing 11 is viewed in a plan view as in FIG.

  A screw 7 as a fixing portion fixes the heat sink 2 to the housing 11 at the protruding portion 9. The screw 7 penetrates the protruding portion 9 from the outside of the housing 11 to the side plate 12 side, and the tip is embedded in the side plate 12. The screw hole into which the screw 7 is inserted is formed by penetrating the protruding portion 9 and entering the side plate 12.

  The protruding portion 9 is formed by, for example, drawing at a desired position in the vicinity of the open side end portion of the housing 11. The protrusion 9 can be easily formed by adding a drawing process to the plate member constituting the housing 11.

  The sealing member 8 is provided between a portion of the housing 11 near the open end and the side plate 12 of the heat sink 2. The sealing member 8 seals the inside of the housing 11. The sealing member 8 functions to prevent rainwater and the like from entering the housing 11 from the connection portion of the housing 11 and the heat sink 2. The outdoor-installed device prevents water from entering various electrical components inside the housing 11 by a waterproof structure using the sealing member 8. Further, the sealing member 8 also has a dustproof function for preventing dust and the like from entering the housing 1 from the connection portion of the housing 11 and the heat sink 2.

  Also in this modification, as the sealing member 8, for example, butyl rubber is used. Also in this modification, the sealing member 8 may be any member that can exhibit waterproofness to prevent water from entering the housing 11 from the outside.

  The screw 7 fixes the protruding portion 9 of the housing 11 by contacting the side plate 12 of the heat sink 2. The sealing member 8 fills a gap between the housing 11 and the side plate 12 around the protruding portion 9.

  According to the configuration of this modified example, the protrusion 9 is prevented from extending by the protrusion 9 in the process of tightening the screw 7 by bringing the protrusion 9 into contact with the side plate 12. By allowing the protrusion 9 to prevent the sealing member 8 from entering the screw 7, it is possible to prevent the sealing member 8 from being bitten by the screw 7 and effectively prevent the screw 7 from loosening. it can. Thereby, also in this modification, an outdoor installation apparatus has the effect that the looseness of a fixing | fixed part is suppressed and high waterproofness can be maintained.

  In the present modification, the positions and the number of the fixed portions and the protruding portions 9 are arbitrarily determined. As the fixing portion, any structure capable of fixing the casing 11 and the heat sink 2 while compressing the sealing member 8 may be applied.

  The outdoor-installed device may be any device as long as the heat dissipating fins 5 of the heat sink 2 are completely disposed outside the housing 11, and the position where the heat sink 2 is disposed with respect to the housing 11 or the heat sink 2 with respect to the housing 11. The occupying range is arbitrary. The configuration of the connection portion between the housing 11 and the heat sink 2 is not limited as long as the protruding portion 9 of the housing 11 is in contact with the heat sink 2 and may be appropriately modified.

  FIG. 6 is a block diagram illustrating a schematic configuration of a photovoltaic power generation system including a grid interconnection inverter which is an example of an outdoor installation device. The solar power generation system includes a plurality of solar cell modules 21, a connection box 22, and a grid interconnection inverter 23 as main components.

  The solar cell module 21 generates DC power by the incidence of sunlight. The connection box 22 is interposed between the solar cell module 21 and the grid interconnection inverter 23 and connects the outputs of the solar cell modules 21 in parallel. The DC power from the solar cell module 21 is collected by the connection box 22 and taken into the grid interconnection inverter 23. The grid interconnection inverter 23 converts the total power generated by the solar cell module 21 into AC power.

  The grid interconnection inverter 23 includes a converter circuit 25, an inverter circuit 26, and an output relay 27. A connection box 22 is connected to the DC input terminal of the grid interconnection inverter 23, and a system 24 is connected to the AC output terminal. The system 24 supplies power of 50 Hz or 60 Hz.

  The converter circuit 25 converts the input voltage into a constant DC voltage by controlling the amount of power from the solar cell module 21. The inverter circuit 26 converts the DC voltage from the converter circuit 25 into an AC voltage synchronized with the system voltage. The output relay 27 executes a switching operation for determining whether to transmit the output of the inverter circuit 26 to the system 24.

  For example, a power module (not shown) that is a semiconductor component provided in the inverter circuit 26 is a main heating element in the grid interconnection inverter 23. The grid interconnection inverter 23 which is an outdoor installation device can be configured as described above by bringing the power module into contact with the heat sink 2 (see FIGS. 1 and 5). By adopting any of the configurations described in the embodiment, the grid interconnection inverter 23 can firmly fix the casings 1 and 11 and the heat sink 2 and can maintain high waterproofness and robustness. it can.

  In addition to the grid-connected inverter 23, outdoor-installed devices are installed outdoors by housing various electrical components including heating elements such as a junction box for photovoltaic power generation or a junction box with a built-in boost function. Any device may be used.

DESCRIPTION OF SYMBOLS 1,11 Housing | casing 2 Heat sink 3 Semiconductor component 4 Opening 5 Radiation fin 6 Base plate 7 Screw 8 Sealing member 9 Protruding part 12 Side plate 21 Solar cell module 22 Connection box 23 System interconnection inverter 24 System 25 Converter circuit 26 Inverter circuit 27 Output relay

Claims (2)

A housing for storing electrical components including a heating element;
A heat sink for releasing heat from the heating element to the outside of the housing;
A fixing portion for fixing the heat sink to the housing;
A sealing member provided between the housing and the heat sink, and sealing an internal space surrounded by the housing and the heat sink;
In the portion of the housing that faces the heat sink, a protruding portion that protrudes toward the heat sink is formed,
The fixing portion is fixed by bringing the protruding portion of the housing into contact with the heat sink,
The outdoor installation device, wherein the sealing member fills a gap between the casing and the heat sink around the protrusion.   The outdoor installation device according to claim 1, wherein the protruding portion is formed by drawing a plate member constituting the housing.

Images