JP6492983B2 - Electronic equipment casing - Google Patents

Description

  The present invention relates to a housing of an electronic device, and more particularly to a waterproof structure of a housing of an electronic device installed outdoors.

  In an electronic device that is exposed to outdoor rainwater, it is common to employ a hollow casing that is closed via a waterproof packing for the purpose of waterproofing the electronic circuit.

  For example, as a conventional outdoor-installed electronic device, there is one having a double waterproof structure housing using two waterproof packings (see Patent Document 1). As shown in FIG. 10, such an electronic device includes a housing in which an upper case 1 is covered with a lower case 2, and the first waterproof packing 7 and the first waterproof packing 7 are disposed between both cases near and far from the storage unit 4. Two waterproof packings 8 are interposed, and a predetermined space Sa is provided between the two waterproof packings. The space Sa prevents water from entering the first packing 7 even if water enters from the outer second waterproof packing 8 by capillary action. Further, in the housing, the eaves portion 14 and the outer extension portion 15 are formed, and a space Sb is provided on the outside of the second waterproof packing 8 so as to prevent moisture from collecting.

JP 2003-101256 A

  Conventional casings for outdoor electronic devices have the following problems. First, because the first and second waterproof packings 7 and 8 are immediately on the back surface of the upper case 1, both the packings are likely to heat up due to the influence of solar radiation, and the deterioration of both packings is accelerated and the maintenance period of waterproof performance is increased. It will be shorter. Next, when strong wind and rain enters the space Sb, the upper case 1 having the eaves portion 14 is deformed and water enters the space Sa due to non-contact between the upper case 1 and the second waterproof packing 8, Waterproof performance may deteriorate. Further, since the portion of the upper case 1 that is in contact with the first and second waterproof packings 7 and 8 is flat, when the amount of water immersion is large, the capillarity at that portion causes water to reach the inside of the housing storage portion 4. There is a high possibility of intrusion. Further, since two waterproof packings are necessary, there is a problem that the number of assembling steps is increased.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to suppress the influence of heat caused by solar radiation on the waterproof packing (hereinafter also simply referred to as packing) while maintaining the waterproof performance. An object is to provide a housing for an electronic device.

The case of the present invention comprises a case body and a lid body that is open at one end and closed at the other end, and the inner wall surface of the opening of the lid body is fitted to the outer wall surface of the opening of the case body. A housing of an electronic device that houses an electronic circuit,
The lid body has a cylindrical inner peripheral wall protruding from the closed end portion toward the opening and spaced from the side wall of the lid body,
A waterproof packing sandwiched between the opening end surface of the case body and the opening end surface of the inner peripheral wall;
The case main body and the lid body have a joint portion that protrudes outward from each side wall at a position away from the opening end portion of the inner peripheral wall and is surface-bonded to each other.

  According to the electronic device casing of the present invention, the structure of the waterproof packing sandwiched between the opening end surface of the case body and the opening end surface of the inner peripheral wall can increase the formation of the heat insulating space and the heat conduction distance to the packing. It is possible to suppress the influence of solar heat. Therefore, while maintaining the waterproof function, it solves the problem of the thermal deterioration of the packing due to the short heat conduction distance to the packing in the conventional electronic device casing and the problem of insufficient rigidity in the casing with a simple configuration it can.

FIG. 1 is a perspective view showing an external appearance of a housing of an electronic device that is an embodiment according to the present invention, as viewed from the lid side. FIG. 2 is a perspective view seen from the case body side showing the appearance of the housing of the electronic device of FIG. FIG. 3 is a schematic cross-sectional view showing the housing of the electronic device taken along line xx of FIG. FIG. 4 is a perspective view showing a case main body of the casing of the electronic apparatus of FIG. FIG. 5 is a perspective view showing a lid body of the casing of the electronic apparatus of FIG. FIG. 6 is an enlarged cross-sectional view illustrating a part of the side wall of the housing of the electronic device according to the embodiment. FIG. 7 is an enlarged cross-sectional view illustrating a part of the side wall of the housing of the electronic device according to the modified example of the embodiment. FIG. 8: is an expanded sectional view which shows a part of side wall of the housing of the electronic device of the modification of an Example. FIG. 9 is an enlarged cross-sectional view illustrating a part of the side wall of the housing of the electronic device according to the modified example of the embodiment. FIG. 10 is a schematic cross-sectional view showing a housing of a conventional outdoor installation device.

  Hereinafter, a case of an electronic apparatus for outdoor installation according to an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the casing 10 of the electronic apparatus of the embodiment has a substantially rectangular shape, and a cylindrical case body 11 and a cylindrical lid that are fitted to each other in the opening. It is composed of a body 12. The case body 11 and the lid body 12 have flanges 12F and 11F that protrude outward from the respective side walls 12PW and 11PW and are surface-bonded to each other.

  The case main body 11 and the lid body 12 are fixed to each other by being fastened by screws Sc provided on the respective flanges in a state where the respective flanges 12F and 11F are surface-bonded.

  As shown in FIG. 1, a plurality of lid flange ribs 12 </ b> R that protrude outward from the side wall are provided between the side wall 12 </ b> PW and the flange 12 </ b> F of the lid body 12. As shown in FIG. 2, a plurality of case body flange ribs 11 </ b> R protruding outward from the side wall are also provided between the side wall 11 </ b> PW and the flange 11 </ b> F of the case body 11. The lid flange rib 12R and the case main body flange rib 11R improve the rigidity of the case main body 11 and the cover body 12 while ensuring the flatness of the flange side surfaces to which the flanges 11F and 12F are joined.

  As shown in FIG. 3, the case main body and the lid bodies 11 and 12 are surface-bonded as the first joint portion A at the flange side surfaces 11 s and 12 s (flanges 12 </ b> F and 11 </ b> F) that face each other. The end surface of the side wall 11PW of the case main body 11 and the end surface of the inner peripheral wall 12PWi are abutted against each other via the packing 13 as the second joint portion B located inside the lid 12 from the first joint portion. That is, the opening end portion of the inner peripheral wall 12PWi of the lid body 12 is fitted in the groove of the opening end surface of the case body 11 in which the packing 13 is accommodated. The case main body and the flanges 11F and 12F of the lids 11 and 12 are surface-bonded so that an electronic component or electronic device (not shown) including an electronic circuit is accommodated inside the packing 13. A sealed housing space SP is defined.

  As shown in FIG. 4, the annular packing 13 is accommodated in an annular packing accommodation groove 11 d formed on the opening end surface 11 o of the side wall 11 </ b> PW of the case body 11. The case main body 11 is a substantially rectangular parallelepiped cylindrical body having one side surface (opening end surface) opened and closed at the other end (bottom surface) facing the opening end surface. The flange 11 </ b> F protruding to the outer peripheral side is formed such that the flange side surface 11 s is located a predetermined distance H away from the opening end surface of the case body 11. Thereby, the outer surface of the side wall 11PW of the case body 11 above the flange 11F can be fitted to the inner surface of the side wall 12PW of the lid body 12. In addition, a connection hole 17 is provided in a part of the side wall 11PW of the case body 11 below the flange 11F to allow an external power supply cable, an input / output cable, and the like to operate the accommodated electronic circuit. .

  As shown in FIG. 5, the lid body 12 is a substantially rectangular parallelepiped cylindrical body having one side surface (opening end surface 12 o) opened and closed at the other end (ceiling 12 c) facing the opening end surface. The inner peripheral wall 12PWi of the lid body 12 is formed in a cylindrical shape so as to project from the ceiling 12c along the inner side of the side wall 12PW of the lid body 12 so as to form an annular groove G between the side wall 12PW and the side wall 12PW. Yes. The inner peripheral wall 12PWi is formed lower than the side wall 12PW of the lid 12. The ceiling of the lid 12 is formed as a curved curved ceiling so that the center thereof is the highest from the flange 12F, and the ceiling 12c is provided with a lid ceiling rib 12R2 for preventing bending and reinforcing the inner circumferential wall 12PWi. It is formed lower.

  A flange 12F is formed on the opening end surface of the lid 12 (the end surface 12o of the side wall 12PW) so as to extend to the outer peripheral side, which defines the flange side surface 12s. A bent portion 12B that is bent so as to cover the peripheral end surface of the outer peripheral edge of the flange 11F when fitted to the case body 11 is provided on the outer peripheral edge of the flange 12F of the lid 12. In addition, the through holes Sh for passing the fastening screws Sc are respectively formed on the flange side surfaces 11s and 12s of the flanges 11F and 12F.

  At the time of assembling the casing, as shown in FIG. 6, the inner surface of the side wall 12PW of the lid body 12 is gap-fitted to the outer surface of the side wall 11PW of the case body 11 (gap SP1). At this time, the end surface of the inner peripheral wall 12PWi of the lid body 12 is placed on the packing 13 in the packing accommodating groove 11d of the case body 11 and tightened with the lid body 12, and pressure is applied to the packing 13 so that the end surface of the inner peripheral wall 12PWi is sealed with the packing 13. The lid 12 is fixed to the case main body 11 with screws (not shown) in the fitted state where the elastic deformation is possible. The dimension Ha from the ceiling of the lid 12 to the end surface of the inner peripheral wall 12PWi and the dimension Hb from the flange side surface 11s to the bottom surface of the packing receiving groove 11d of the side wall 11PW are suitable for the packing 13 in the surface joining at the time of assembly. The tightening pressure is set to be applied.

  In the present embodiment, the flanges 11F and 12F are fastened with the screws Sc while the inner peripheral wall 12PWi and the side wall 11PW are in the fitted state via the packing 13, so that the surface joint of the flange and the inner peripheral wall 12PWi and the packing 13 are joined. Waterproofing is performed completely, and it becomes possible to prevent fluctuations in pressure due to changes over time.

  After the assembly, the rigidity of the lid 12 is improved by the surface bonding (first bonding portion A) of the flanges 12F and 11F and the fitting (second bonding portion B) of the side wall 11PW and the inner peripheral wall 12PWi.

  In addition, after the assembly, the side wall 12PW and the inner peripheral wall 12PWi of the lid body 12 and the end surfaces of the side wall 11PW of the case main body 11 define an air insulation layer (space SP2) to form a double wall structure. Therefore, the air insulation layer prevents the packing 13 from receiving direct heat conduction due to solar radiation of the lid 12.

  In this embodiment, as shown in FIG. 6, an outer peripheral groove T is formed in the side wall 11 </ b> PW immediately below the packing housing groove 11 d of the case body 11. A double wall is formed by the outer circumferential groove T formed along the side wall 11PW inside the flange 11F, and the heat radiation effect from the flange 11F of the case body 11 to the vicinity of the side wall 11PW and the packing 13 is improved. In addition, the rigidity of the side wall 11PW of the case body 11 can be increased by the double wall having the U-shaped cross section of the side wall 11PW formed by the outer peripheral groove T.

  Next, the operation of this embodiment will be described.

  The casing having the waterproof structure of this embodiment is installed outdoors. When the casing is exposed to rainwater or the like, rainwater or the like from above or from the side of the casing 10 is stopped at the bent portion 12B shown in FIG. Absent. Further, when water has entered from the back surface gap of the bent portion 12B due to wind or the like, water is stopped at the flange side surfaces 11s and 12s (flanges 12F and 11F) where the lid 12 and the case body 11 are surface-joined. .

  When the amount of water immersion is large, water may enter between the flange side surfaces 11s and 12s (flanges 12F and 11F) to be joined by capillary action. Even in this case, since there is a gap SP1 in the fitting portion between the case body 11 and the lid body 12 at the back of the flanges 11F and 12F to be surface-bonded as shown in FIG. That is, the packing 13 is attached at a position having a height difference H (distance from the flange side surface 11s to the opening end surface of the side wall 11PW). Infiltration water accumulates up to this position, and if it does not exceed this, the infiltration water enters the packing 13 Will not touch and will remain waterproof. Finally, the packing 13 itself prevents water from entering.

  Furthermore, when the casing is exposed to solar radiation, the packing 13 is not easily heated due to the influence of solar radiation because the packing 13 is located behind the surface of the lid 12 with the space SP2 shown in FIG. That is, the distance H and Ha between the side wall 11PW and the inner peripheral wall 12PWi can increase the heat conduction distance to the packing 13, and the influence of solar heat can be reduced.

  A thermoplastic synthetic resin called general-purpose plastic can be used as the material of the housing 10. General-purpose plastics include polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polystyrene (PS), polyurethane (PUR), acrylonitrile butadiene styrene resin (ABS), and acrylonitrile styrene resin. (AS), acrylic resin (PMMA), polycarbonate (PC) and the like. In addition, an engineering plastic can also be used for the housing 10. Furthermore, a metal can also be suitably used for the material of the housing 10.

  As a modification of the above embodiment, as shown in FIG. 7, a bent portion (FIG. 6) covers the peripheral end surface of the outer peripheral edge of the flange 11F of the case body 11 at the outer peripheral edge of the flange 12F of the lid body 12. , 12B) may be omitted. As another modified example, as shown in FIG. 8, the outer peripheral groove (FIG. 6, T) formed along the side wall 11PW inside the flange 11F of the case body 11 may be omitted. Furthermore, as another modified example, the waterproof packing 13 only needs to be sandwiched between the opening end surface of the case body 11 and the opening end surface of the inner peripheral wall 12PWi of the lid body 12, and can exhibit a waterproof function, as shown in FIG. The waterproof packing 13 may be fixed to the opening end of the inner peripheral wall 12PWi.

DESCRIPTION OF SYMBOLS 11 ... Case main body 11R ... Case main body flange rib 11PW ... Side wall 11F ... Flange 11s ... Flange side surface 12 ... Cover body 12B ... Bending part 12R ... Cover flange rib 12PW ... Side wall 12PWi ... Inner peripheral wall 12C ... Cover curved surface ceiling 12R2 ... Cover ceiling rib 12PW ... side wall 12F ... flange 12s ... flange side surface 13 ... packing SP1 ... gap SP2 ... space

Claims (6)

An electronic circuit is housed comprising a case body and a lid body that is open at one end and closed at the other end, and the inner wall surface of the opening of the lid body can be fitted to the outer wall surface of the opening of the case body. A housing of an electronic device,
The lid body has a cylindrical inner peripheral wall protruding from the closed end portion toward the opening and spaced from the side wall of the lid body,
A waterproof packing sandwiched between the opening end surface of the case body and the opening end surface of the inner peripheral wall;
The case body and the lid body, have a joint surfaces joined to each other to project outwardly from the respective side wall at a position spaced from the open end portion of said inner peripheral wall,
The height of the said inner peripheral wall is lower than the height from the closed end part of the said cover body to the opening end surface , The housing | casing of the electronic device characterized by the above-mentioned .   2. The electron according to claim 1, wherein the case main body has a groove in which an opening end portion of the inner peripheral wall can fit in an opening end surface thereof, and the waterproof packing is disposed at a bottom portion of the groove. Equipment enclosure. The outer peripheral edge of the joint portion of the cover body, an electronic device according to claim 1 or 2, characterized in that the bent portion to cover the peripheral end face of the outer circumferential edge portion of the joint portion of the case body is provided Housing. Housing of an electronic device according to any one of claims 1 to 3, characterized in that it has an inner circumferential groove formed along the side wall of the case body of the joint portion of the case body. An electronic circuit is housed comprising a case body and a lid body that is open at one end and closed at the other end, and the inner wall surface of the opening of the lid body can be fitted to the outer wall surface of the opening of the case body. A housing of an electronic device,
The lid body has a cylindrical inner peripheral wall protruding from the closed end portion toward the opening and spaced from the side wall of the lid body,
A waterproof packing sandwiched between the opening end surface of the case body and the opening end surface of the inner peripheral wall;
The case main body and the lid body have joints that protrude outward from the respective side walls at positions away from the opening end of the inner peripheral wall and are surface-bonded to each other.
A casing for an electronic device , wherein a bent portion that covers a peripheral end surface of an outer peripheral edge portion of the joint portion of the case body is provided on an outer peripheral edge portion of the joint portion of the lid body. An electronic circuit is housed comprising a case body and a lid body that is open at one end and closed at the other end, and the inner wall surface of the opening of the lid body can be fitted to the outer wall surface of the opening of the case body. A housing of an electronic device,
The lid body has a cylindrical inner peripheral wall protruding from the closed end portion toward the opening and spaced from the side wall of the lid body,
A waterproof packing sandwiched between the opening end surface of the case body and the opening end surface of the inner peripheral wall;
The case main body and the lid body have joints that protrude outward from the respective side walls at positions away from the opening end of the inner peripheral wall and are surface-bonded to each other.
A housing for an electronic device, comprising an outer peripheral groove formed along a side wall of the case body inside a joint portion of the case body.

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