JP5308238B2 - Protective case waterproof structure - Google Patents

Description

  The present invention relates to a protective case for protecting communication devices installed outdoors from rainwater and the like, and more particularly to a waterproof structure for a protective case in which the waterproofness of a joint portion of the protective case member is enhanced.

  In recent years, satellite communication services such as the Internet have been provided by ships via Inmarsat geostationary satellites. In order to receive radio waves from Inmarsat geostationary satellites, an antenna is required, and a radome for housing the antenna is attached to the mast of the ship. In the case of a radome that houses a large antenna, an inspection door for inspecting the antenna can be provided in the radome body, and periodic inspection of the antenna is performed by opening the inspection door. Since the radome is arranged outdoors, packing is used at the joint between the radome body and the radome base in order to prevent rainwater from entering the radome. Conventionally, the structure of the housing | casing which improved the waterproofness of the junction part using packing is known (for example, refer patent document 1, 2).

JP-A-6-288473 Japanese Patent Laid-Open No. 10-22658

  However, in the case of a radome that houses a small antenna, it is not possible to secure a space for providing an inspection door for antenna inspection in the radome body, so that it is necessary to remove the radome body from the radome base at the time of inspection. Therefore, when the inspection door is not provided, the radome main body is repeatedly removed every inspection, and the waterproof performance of the joint portion may be deteriorated. Such a problem is not limited to a radome that protects an antenna, but also exists in a protective case (housing) that protects communication devices installed outdoors from rainwater.

  Therefore, an object of the present invention is to provide a waterproof structure for a protective case that can maintain high waterproofness for a long period of time even if members constituting the protective case are repeatedly removed.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a first protective case member having a flange portion bulging radially inward on the inner peripheral surface side of the cylindrical end portion; A protective case waterproof structure comprising: a second protective case member having a fastening portion extending in a circumferential direction facing the inner peripheral surface of the protective case member and fastened to the flange portion, wherein the first protection An annular packing extending in the circumferential direction is fixed to either the inner peripheral surface side of the case member or the fastening portion side of the second protective case member, and a first contact portion formed in the packing and extending in the circumferential direction Is brought into contact with either the inner peripheral surface of the first protective case member or the outer peripheral surface of the first protective case member facing the inner peripheral surface of the fastening portion of the second protective case member. And formed on the packing A second contact portion extending in a direction is brought into contact with either the flange portion of the first protective case member or the fastening surface facing the flange portion in the fastening portion of the second protective case member. It is characterized by.

  According to this invention, between the 1st protective case member and the 2nd protective case member, two places of the 1st contact part and the 2nd contact part which were formed in the annular packing extended in the circumferential direction Sealed with, the waterproof performance is improved.

  The invention according to claim 2 is a first protective case member having a flange portion bulging radially inward on the inner peripheral surface side of the cylindrical end portion, and the inner periphery of the first protective case member An annular packing provided in a protective case provided with a second protective case member having a circumferentially extending fastening portion that faces the surface and is fastened to the flange portion, the inner side of the first protective case member A fixing portion that can be fixed to either the peripheral surface side or the fastening portion side of the second protective case member, and the fastening of the inner peripheral surface of the first protective case member or the second protective case member A first contact portion extending in a circumferential direction capable of contacting any one of the outer peripheral surfaces of the first protective case member facing the inner peripheral surface, and the flange portion of the first protective case member or the In the fastening portion of the second protective case member A second contact portion which takes extending either allows contact a circumferential direction of the fastening surface facing the flange portion, characterized by comprising a.

  According to a third aspect of the present invention, in the waterproof structure of the protective case according to the first aspect, the nut is held on the flange portion side of the first protective case member, and the second protection into which the bolt can be inserted. Forming a female screw part that can be screwed into the bolt in a part of the bolt hole of the case member, and disposing a seal washer that can contact the outer surface of the second protective case member on the head side of the bolt, The fastening hole of the flange portion of the first protective case member can contact both the fastening surface of the fastening portion facing the flange portion of the second protective case member and the nut, and the bolt An insertable cylindrical packing is disposed, the bolt is inserted into the bolt hole of the second protective case member, the fastening hole of the first protective case member, and the cylindrical packing, and the bolt is inserted into the nut. Characterized by being sandwiched from the axial direction by the cylindrical packing and fastening surface of the fastening portion by screwing into said nut.

  According to invention of Claim 1 and 2, between the 1st protective case member and the 2nd protective case member is 2 by the 1st contact part and the 2nd contact part which were formed in packing. Since it will be sealed in place, even if the first protective case member is repeatedly removed from the second protective case member, it is possible to reliably prevent rainwater and the like from entering the protective case. High waterproofness can be obtained over a period of time.

  According to the invention described in claim 3, by screwing the bolt and the nut, the seal washer disposed on the head side of the bolt can be brought into close contact with the outer surface of the second protective case member, and the cylinder The cylindrical packing is clamped from the axial direction by the second protective case member and the nut. As described above, the fastening portion by the bolt and the nut is also sealed at two places, so that rainwater or the like hardly enters the protective case through the fastening portion, and high waterproofness can be obtained over a long period of time.

It is sectional drawing which shows a part of waterproof structure of the protective case concerning embodiment of this invention, Comprising: It is an expanded sectional view of the B section in FIG. It is sectional drawing which shows a part of waterproof structure of the protective case concerning embodiment of this invention, Comprising: It is an expanded sectional view which follows the EE line in FIG. It is a fragmentary sectional view of the 2nd protective case member in FIG. It is sectional drawing of the nut in FIG. It is a bottom view of the protection case of the assembly state in FIG. It is sectional drawing which shows a part of waterproof structure of the protective case concerning embodiment of this invention, Comprising: It is sectional drawing which follows the AA line in FIG. It is a whole perspective view of the protection case of the assembly state of FIG. It is a disassembled perspective view of the protection case of the assembly state of FIG. It is a front view which shows the whole cyclic | annular packing in FIG. It is an expanded sectional view of the C section in the packing of FIG. It is an expanded sectional view which shows the modification of the packing of FIG.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  1 to 10 show an embodiment of the present invention. As shown in FIGS. 6 and 7, the radome 1 as a protective case has a structure that can be attached to a mast 60 of a ship. In the radome 1, an antenna 2 for receiving radio waves from an Inmarsat geostationary satellite and an antenna flange 3 for holding the antenna 2 are housed. A signal received by the antenna 2 is output via a cable (not shown).

  The radome 1 has a radome body 10 as a first protective case member and a radome base 20 as a second protective case member. The radome body 10 is formed in a predetermined shape by FRP molding. The radome body 10 is formed in a hemispherical shape on the front end portion 10a side, and the rear end portion 10b is formed in a cylindrical shape.

  A flange portion 13 bulging radially inward is formed on the inner surface 12 side of the radome body 10. The flange portion 13 is positioned in the vicinity of a cylindrical end portion 14 of the radome body 10 described later, and extends in the circumferential direction along the inner surface 12. A plurality of fastening holes 15 for fastening with the radome base 20 are formed in the flange portion 13. The fastening holes 15 are formed at a predetermined interval in the circumferential direction of the flange portion 13. The flange portion 13 extends radially inward at a substantially right angle with respect to the inner surface 12 of the radome body 10, and a nut 30 described later can contact the flange inner surface 13a facing the tip portion 10a. A flange outer surface 13 b of the flange portion 13 that faces the opening side of the radome body 10 can contact the fastening portion 21 of the radome base 20.

  The cylindrical end portion 14 of the radome body 10 has substantially the same thickness as the flange portion 13, and the end surface 14 a is located at substantially the same position as the outer surface 21 d of the fastening portion 21 of the radome base 20. The inner peripheral surface 14 b of the cylindrical end portion 14 is substantially perpendicular to the flange outer surface 13 b of the flange portion 13. The flange outer surface 13b and the inner peripheral surface 14b constitute a sealing surface, and the surface is formed more smoothly than other portions. The packing 50 shown in FIG. 10 can contact the outer surface 13b of the flange and the inner peripheral surface 14b. As shown in FIG. 1, the first contact portion 51 of the packing 50 can come into contact with the inner peripheral surface 14b, and the second contact portion 52 of the packing 50 can come into contact with the flange outer surface 13b. Yes.

  As shown in FIG. 6, the radome base 20 is formed in a disk shape that is smoothly curved toward the radome body 10 side. The radome base 20 is formed into a predetermined shape by FRP molding, and the dimensions and surface roughness of the entire outer surface 20a are finished with high accuracy. A fastening portion 21 for fastening with the radome body 10 is formed on the outer peripheral portion of the radome base 20. The fastening portion 21 is integrated with a thin plate-like base portion 22 a in the radome base 20. The thin plate-like base portion 22a is reinforced by a plurality of radially arranged ribs 22b. As shown in FIG. 6, a bolt 25 is inserted into the antenna flange 3, a specific rib 22 b of the radome base 20, and a fastening flange portion 60 a of the mast 60, and a nut 26 is screwed to the tip of the bolt 25. Has been. Thereby, the antenna flange 3 is fixed to the mast 60 in a state of being integrated with the radome base 20. As shown in FIG. 8, the radome base 20 is provided with positioning pins 27 that can be fitted into the positioning holes 17 formed in the radome body 10.

  As shown in FIG. 3, a fastening surface 21 a that can contact the flange portion 13 of the radome body 10 is formed on the fastening portion 21 located on the outer peripheral portion of the radome base 20. The side opposite to the fastening surface 21 a of the fastening part 21 is formed on a fastening part outer surface 21 b that can contact a seal washer 41 provided on the head 40 c side of the bolt 40. The seal washer 41 is brought into close contact with the fastening portion outer surface 21b by tightening the bolt 40, and has a function of preventing rainwater and the like from entering the bolt hole 23. Two fixing grooves 21 c and 21 d for fixing the packing 50 are formed on the outer peripheral surface 21 e side of the fastening portion 21. One fixing groove 21 c is formed on the fastening surface 21 a side and extends over the entire circumference of the fastening portion 21. The other fixing groove 21 d is formed on the fastening portion outer surface 21 b side, and similarly extends over the entire circumference of the fastening portion 21. One fixing groove 21c is a groove into which the upper fixing portion 53 of the packing 50 shown in FIG. 10 is fitted, and the other fixing groove 21d is a groove into which the lower fixing portion 54 of the packing 50 is fitted. The packing 50 is securely fixed to the fastening portion 21 by fitting the upper fixing portion 53 and the lower fixing portion 54 into the fixing grooves 21c and 21d.

  The fastening part 21 is formed with a bolt hole 23 penetrating the fastening surface 21a and the fastening part outer surface 21b. A drop prevention screw (female screw) 23b that can be screwed with the male screw 40a located at the tip of the bolt 40 is formed on the inner peripheral surface of the bolt hole 23 on the fastening portion outer surface 21b side. On the inner peripheral surface of the bolt hole 23, an inner peripheral surface 23a is formed with the female screw 23b as a boundary. The inner peripheral surface 23a is located on the fastening surface 21a side. The inner peripheral surface 23 a is formed slightly larger than the diameter of the male screw 40 a of the bolt 40.

  FIG. 4 shows details of the nut 30. The nut 30 has a holding groove 30a formed on the top of the outer surface. As shown in FIG. 2, a hat-shaped fastener 32 is fitted into the holding groove 30a. Both ends of the clasp 32 are fixed to the flange portion 13 of the radome body 10 by bolts 33. When the nut 30 is fixed to the radome body 10 via the clasp 32, the nut 30 can be finely moved, and the positioning (adjustment) of the plurality of nuts 30 and the bolts 40 can be easily performed. ing. A cylindrical packing 31 can be attached to the shaft portion 30 b of the nut 30. The cylindrical packing 31 is made of silicon rubber, and has a flange portion 31a that bulges outward in the radial direction at one end portion. The nut 30 is formed with a groove 30 c that houses the flange portion 31 a of the cylindrical packing 31. The nut 30 is formed with a female screw 30e into which the male screw 40a of the bolt 40 can be screwed.

  As shown in FIG. 1, the cylindrical packing 31 can be inserted into a fastening hole 15 formed in the flange portion 13 of the radome body 10 except for the flange portion 31 a. In a state where the cylindrical packing 31 is attached to the nut 30, the tip end surface of the cylindrical packing 31 located on the opposite side of the flange portion 31 a protrudes slightly outward from the end surface 30 d of the nut 30. The cylindrical packing 31 has a length in the axial direction so that a portion protruding from the end surface 30 d of the nut 30 can abut on the fastening surface 21 a of the radome base 20. As a result, in the state in which the nut 30 and the bolt 40 are screwed together and the radome body 10 and the radome base 20 are fastened by the nut 30 and the bolt 40, the axial end surfaces of the cylindrical packing 31 are the radome base 20 and the nut, respectively. 30.

  9 and 10 show the packing 50 that seals the fastening portion between the radome body 10 and the radome base 20. The packing 50 is made of silicon rubber and can be expanded and contracted in the radial direction. The packing 50 has a substantially U-shaped cross section, and has an upper fixing portion 53 and a lower fixing portion 54 at the end. Moreover, the packing 50 has the 1st contact part 51 and the 2nd contact part 52 which exhibit a sealing function. In this embodiment, the packing 50 has three first contact portions 51 and two second contact portions 52. The first contact portion 51 is formed on the outer peripheral surface 50 a of the packing 50, and is disposed at a predetermined interval in the axial direction of the radome 1. Each first contact portion 51 protrudes radially outward from the outer peripheral surface 50a, and can be elastically deformed in the arrow direction of FIG. 10 by contact with the cylindrical end portion 14 of the radome body 10. The second contact portions 52 are formed on the upper surface 50 b of the packing 50, and are arranged at a predetermined interval in the radial direction of the radome 1. Each first contact portion 51 protrudes from the upper surface 50 b and can be elastically deformed by contact with the flange portion 13 of the radome body 10.

  Next, the work procedure and operation of attaching and removing the radome body 10 to the radome base 20 will be described.

  Since the radome body 10 in this embodiment is not provided with an openable / closable inspection lid for inspecting the antenna 2, when inspecting the antenna 2, the bolt 40 screwed with the nut 30 is loosened. It is necessary to remove the dome body 10 from the radome base 20. When removing the radome body 10 from the radome base 20, the bolt 40 is rotated about its axis until the male screw 40 a of the bolt 40 is completely removed from the female screw 30 e of the nut 30. Since the axis of the radome 1 is directed vertically, when the male screw 40a of the bolt 40 is completely removed from the female screw 30e of the nut 30, the bolt 40 falls due to its own weight, but the male screw 40a Since the fall prevention screw 23b is formed below the male screw 40a, the male screw 40a abuts against the fall prevention screw 23b, so that the bolt 40 can be prevented from falling off.

  In this embodiment, since the radome 1 is attached to the tip of the mast 60 of the ship, the inspection of the antenna 2 is a work at a high place, but by preventing the bolt 40 from falling off, Safety by loss prevention and bolt drop prevention can be secured. Further, in order to completely remove the bolt 40 from the bolt hole 23, the bolt 40 may be further rotated around the axial center to release the screw engagement between the male screw 40a and the fall prevention screw 23b.

  Next, the radome body 10 can be removed from the radome base 20 by pulling out the radome body 10 in the axial direction with respect to the radome base 20 with all the bolts 40 unscrewed from the nut 30. . Here, since the nut 30 is fixed to the radome body 10 via the clasp 32, the nut 30 can be prevented from being detached from the radome body 10 when the radome body 10 is removed. Further, since the flange portion 31 a of the cylindrical packing 31 is sandwiched between the flange portion 13 of the radome body 10 and the nut 30, the cylindrical packing 31 is also removed together with the radome body 10.

  When the inspection of the antenna 2 is completed, the radome body 10 is attached to the radome base 20 again. When the radome body 10 is attached to the radome base 20, the cylindrical end portion 14 of the radome body 10 abuts on the first contact portion 51 of the annular packing 50, and the first contact portion 51 is as shown in FIG. In contact with the inner peripheral surface 14b of the cylindrical end portion 14 while being elastically deformed. Further, the second contact portion 52 of the annular packing 50 abuts on the flange outer surface 13b of the flange portion 13 of the radome body 10, and the second contact portion 52 is elastically deformed into a flat shape as shown in FIG. To contact the flange outer surface 13b. In this state, the bolt 40 is rotated about the axis, and the male screw 40 a of the bolt 40 is screwed into the female screw 30 e of the nut 30.

  In a state where the bolt 40 is completely screwed into the female screw 30e of the nut 30, the seal washer 41 located on the head side of the bolt 40 is in close contact with the outer surface 21b of the fastening portion, and a gap between the bolt 40 and the radome base 20 is formed. Sealed. In this state, the axial end of the cylindrical packing 31 is in close contact with the fastening surface 21 a of the radome base 20 and the groove 30 c of the nut 30. Therefore, for example, even if water enters the bolt hole 23 through the gap between the seal washer 41 and the fastening portion outer surface 21b, it is possible to reliably prevent water from entering the radome 1 due to the sealing effect of the cylindrical packing 31. .

  As described above, in this embodiment, since the inspection opening is not provided in the radome body 10, it is necessary to remove the radome body 10 from the radome base 20 when inspecting the antenna 2. Since the cylindrical packing 31 is disposed at the site where the seal is located and the seal 50 is provided with the first contact portion 51 and the second contact portion 52 on the packing 50, the radome body 10 can be repeatedly removed. Thus, it becomes possible to maintain a high waterproof effect over a long period of time, and it is possible to reliably prevent water from entering the radome 1.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to the above-described embodiment, and even if there is a design change or the like without departing from the gist of the present invention, It is included in this invention. For example, instead of the first contact portion 51 of the packing 50 fixed to the radome base 20, a curved contact portion 55 shown in FIG. 11 is formed, and the free end 55 a of the curved contact portion 55 is formed inside the cylindrical end portion 14. It is good also as a structure made to contact the surrounding surface 14b. Further, the protective case of the present invention is not limited to the radome 1, but is a concept including a casing for protecting communication devices other than the antenna 2, and can be applied in various fields other than the antenna. Further, in this embodiment, the case where the packing 50 is fixed to the radome base 20 has been described. However, the packing 50 is fixed to the radome body 10 and the first contact portion 51 and the second contact portion 52 are connected to the radome base. It is good also as a structure made to contact 20 side.

1 Radome (protective case)
2 Antenna 3 Antenna flange 10 Radome body (first protective case member)
14 cylindrical end portion 14b inner peripheral surface 15 fastening hole 20 radome base (second protective case member)
21 Fastening portion 21a Fastening surface 23 Bolt hole 30 Nut 31 Cylindrical packing 40 Bolt 41 Seal washer 50 Annular packing

Claims (3)

A first protective case member having a flange portion bulging radially inward on the inner peripheral surface side of the cylindrical end portion, and facing the inner peripheral surface of the first protective case member and fastening with the flange portion A protective case waterproof structure comprising a second protective case member having a fastening portion extending in the circumferential direction,
An annular packing extending in the circumferential direction is fixed to either the inner peripheral surface side of the first protective case member or the fastening portion side of the second protective case member, and is formed in the packing and extends in the circumferential direction. The first contact portion is formed on the outer peripheral surface of the first protective case member facing the inner peripheral surface of the first protective case member or the inner peripheral surface of the first protective case member. The second contact portion formed in the packing and extending in the circumferential direction is brought into contact with either of the flange portion of the first protective case member or the flange portion in the fastening portion of the second protective case member. A waterproof structure for a protective case, wherein the waterproof structure is brought into contact with any one of the fastening surfaces facing each other. A first protective case member having a flange portion bulging radially inward on the inner peripheral surface side of the cylindrical end portion, and facing the inner peripheral surface of the first protective case member and fastening with the flange portion An annular packing provided in a protective case provided with a second protective case member having a fastening portion extending in the circumferential direction,
A fixing portion that can be fixed to either the inner peripheral surface side of the first protective case member or the fastening portion side of the second protective case member;
A circumference capable of contacting either the inner peripheral surface of the first protective case member or the outer peripheral surface of the first protective case member facing the inner peripheral surface of the fastening portion of the second protective case member. A first contact portion extending in a direction;
A second contact portion extending in a circumferential direction capable of contacting either the flange portion of the first protective case member or the fastening surface facing the flange portion in the fastening portion of the second protective case member;
Packing characterized by comprising. A nut is held on the flange portion side of the first protective case member, a bolt hole is provided in the second protective case member through which a bolt can be inserted, and the second protective case member on the head side of the bolt A seal washer that can contact the outer surface of the first protective case member, and a fastening surface of the fastening portion facing the flange portion of the second protective case member in a fastening hole of the flange portion of the first protective case member; A cylindrical packing that can contact any of the nuts and into which the bolt can be inserted is disposed, and the bolt is connected to the bolt hole of the second protective case member and the fastening hole of the first protective case member. The cylindrical packing is sandwiched from the fastening surface of the fastening portion and the nut from the axial direction by being inserted into the cylindrical packing and screwing the bolt into the nut. , Waterproof protection case according to claim 1.