JP2014007785A - Drain dustproof device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drain dustproof device which is easily applied to a bus duct with a simple structure and achieves predetermined drainage performance and dustproof performance.SOLUTION: A drain dustproof device includes: a plate-like base part 13 which is closely attached to a bottom plate part 12 of a housing 6 and has a second water flow hole 19 communicating with a first water flow hole 18 formed at the bottom plate part 12 of the housing 6; a cylindrical upper case part 14 fastened to the base part 13; a cylindrical lower case part 15 which has a closed bottom, is detachably attached to the upper case part 14, and has a third water flow hole 22 at a bottom part; and a number of balls 17 which are disposed in an internal space 16 enclosed by the base part 13, the upper case part 14, and the lower case part 15 and make a water flow passage in the internal space 16 into a stray flow structure.

Description

  The present invention relates to a drainage and dustproof device installed in a bus duct connecting various devices of a power receiving / transforming facility in a power receiving / transforming facility installed in a building or a factory.

  For example, power receiving / transforming equipment installed in buildings and factories includes various devices such as switch gears and transformers. Among these various devices, for example, a bus duct is used as means for electrically connecting a switch gear and a transformer indoors and outdoors. The bus duct has a structure in which a strip plate conductor that electrically connects the switchgear and the transformer is supported by an insulating support member such as an insulator.

  A structure in which a strip plate conductor is supported by an insulating support member when the humidity inside the duct rises due to rainwater entering the duct or condensation inside the duct in the surrounding environment where this type of bus duct is installed, especially outdoors. There is a risk that the insulation performance in the case will deteriorate. When such insulation performance is degraded, a ground fault occurs.

  Therefore, it is effective to install a water draining device in the bus duct (see, for example, Patent Document 1). The water draining device disclosed in Patent Document 1 has a structure in which a screw hole is provided in a duct bottom and a male screw is screwed into the screw hole. A large number of granular materials are accommodated in the concave portion of the male screw, and a hole having a diameter smaller than the diameter of the granular material is formed in the outer portion of the duct of the male screw, and a hole having a diameter smaller than that of the granular material is formed in the inner portion of the duct of the male screw. It has a structure with a lid on which is formed.

  In this water draining device, the water accumulated in the duct passes through the gap between the granular materials and is discharged out of the duct. Along with this drainage effect, the position between the particulates is shifted, and by closing a part of the hole formed in the male screw and the lid, foreign matters such as dust can enter the duct from outside the duct. Be blocked. In this way, a water draining device having both a drainage effect and a dustproof effect has been proposed.

Japanese Utility Model Publication No. 55-58085

  By the way, the drainage device disclosed in the above-mentioned Patent Document 1 has a structure in which a screw hole is provided in the bottom of the duct and a male screw is screwed into the screw hole. Such a screw-type water draining device is very difficult to apply to a bus duct that connects a switchgear of a power receiving / transforming facility and a transformer.

  That is, it is very difficult to form a screw hole in an existing bus duct already installed in a building or factory. In addition, since the thickness of the bus duct bottom is thin, it is very difficult to form a screw hole in the bus duct bottom having such a thin thickness.

  Therefore, the present invention has been proposed in view of the above-described problems, and the object of the present invention is to provide a water structure that can be easily applied to a bus duct with a simple structure and can exhibit the desired drainage performance and dustproof performance. The object is to provide a dustproof device.

  As a technical means for achieving the above-mentioned object, the drainage dustproof device according to the present invention is attached in close contact with the bottom plate portion of the casing, and the first water passage hole formed in the bottom plate portion of the casing. A plate-like base portion having a second water passage communicating with the base, a cylindrical upper case portion fixed to the base portion, and a detachable attachment to the upper case portion, and a third water passage hole at the bottom A bottomed cylindrical lower case portion having a base member, an inner space surrounded by a base case, an upper case portion, and a lower case portion, and a partition member having a water passage in the inner space as a stray flow structure It is structured.

  In the present invention, the first water passage hole and the second water passage hole are formed in the bottom plate portion and the base portion of the housing, and the third water passage hole is formed in the bottom portion of the lower case portion. The partition member arranged in the internal space consisting of the lower case portion has a water flow passage in the internal space having a labyrinth structure, so that water stored in the housing is discharged from the third water flow hole in the lower case portion. While being able to discharge | emit quickly, foreign materials, such as dust and water, can be prevented from entering the inside of the housing. In this way, the desired drainage performance and dustproof performance can be achieved, and the first water passage hole formed in the bottom plate portion of the housing does not need to be a screw hole. It is easy to install the draining dustproof device, and even when the thickness of the bottom plate portion of the casing is thin, the draining dustproof device can be easily installed.

  The partition member in the present invention is preferably composed of a large number of spheres accommodated in the lower case portion. Thus, if a partition member is comprised with many spheres, the water stored inside the housing | casing will be rapidly discharged | emitted outside from the 3rd water flow hole of a lower case part through the clearance gap between spheres. At the same time, foreign substances such as dust and water are blocked from entering the inside of the housing by the stray flow structure formed by the sphere while the sphere blocks a part of the third water passage hole of the lower case portion.

  In the base portion of the present invention, the second water passage holes having a diameter smaller than that of the first water passage hole of the housing are arranged at a plurality of positions on the periphery of the first water passage hole of the housing. A structure opened at a polymerization portion with two water passage holes is desirable. In this way, a part of the first water passage hole of the housing is closed by the base portion, and a part of the second water passage hole of the base portion is closed by the housing, and the second water passage hole of the base portion is If it is opened only at the overlapping part with the first water passage hole of the housing, it becomes easy to form a very small opening part, and easily achieve the function that has both the desired drainage performance and dustproof performance. be able to.

  In the present invention, as a structure in which the lower case portion is detachably attached to the upper case portion, a female screw is formed on the inner wall surface of the upper case portion and a male screw is formed on the outer wall surface of the lower case portion. A structure that is screwed into the part by insertion is desirable. By adopting such a structure, it becomes easy to attach and detach the lower case part with respect to the upper case part, and the inside of the upper case part and the lower case part can be easily cleaned, or the partition member disposed in the internal space can be removed. Can be easily replaced. It is also possible to adjust the volume of the internal space in accordance with the screwing amount of the lower case part.

  In the present invention, a structure provided with a locking mechanism for fixing the lower case part to the upper case part is desirable. In this way, by providing a locking mechanism, it is possible to reliably prevent the lower case part from dropping off from the upper case part even when an impact such as vibration is applied, and to provide a drainage dustproof device with excellent earthquake resistance. Can do.

  According to the present invention, the first water passage hole and the second water passage hole are formed in the bottom plate portion and the base portion of the casing, and the third water passage hole is formed in the bottom portion of the lower case portion. The water flow passage in the internal space is made into a stray flow structure by the partition member arranged in the internal space consisting of the upper and lower case parts, so that the water stored in the housing is made into the third water flow hole in the lower case part. Can be quickly discharged, and foreign substances such as dust and water can be prevented from entering the housing.

  In this way, the desired drainage performance and dustproof performance can be achieved, and the first water passage hole formed in the bottom plate portion of the housing does not need to be a screw hole. It is easy to install the draining dustproof device, and even when the thickness of the bottom plate portion of the casing is thin, the draining dustproof device can be easily installed.

It is an assembly exploded perspective view showing an embodiment of a draining dustproof device according to the present invention. In embodiment of this invention, it is sectional drawing which shows the state which assembled | attached the drainage dustproof apparatus to the bus duct. It is sectional drawing which follows the AA line of FIG. FIG. 3 is a bottom view of FIG. 2. It is a principal part enlarged view of FIG. It is an assembly exploded perspective view showing other embodiments of the present invention. In other embodiment of this invention, it is sectional drawing which shows the state which assembled | attached the drainage dustproof apparatus to the bus duct. It is sectional drawing which follows the BB line of FIG. It is a front view which shows the example of installation of the bus duct to which this invention is applied. FIG. 10 is a partially enlarged front view showing the bus duct of FIG. 9. It is sectional drawing which follows the CC line of FIG.

  Embodiments of the drainage dustproof device according to the present invention will be described in detail below. In addition, in the following embodiment, the case where it applies to the bus duct which electrically connects a switchgear and a transformer among the various apparatuses of a receiving / transforming installation installed in a building, a factory, etc. indoors and outdoors is illustrated. The present invention is applicable to a housing having a structure other than the bus duct.

  The bus duct 1 in this embodiment has a housing structure that electrically connects the switch gear 2 and the transformer 3 indoors and outdoors as shown in FIG. 9, and the switch gear 2 as shown in FIGS. And a strip-like conductor 4 (three-phase in the figure) that electrically connects the transformer 3 and the transformer 3 are supported by an insulating support member 5 such as an insulator or a bushing. An insulating support member 5 that supports the strip-shaped conductor 4 is attached to a support frame 7 that is installed inside the housing 6. This type of bus duct 1 is used for inspecting the inside of the connection portion 8 and the housing for connecting the housings to prevent foreign matter such as water and dust from entering the housing 6. A dustproof performance is exhibited by adopting a sealed structure in which packing is attached to the inspection unit 9.

  Further, when the humidity inside the duct rises due to the intrusion of rainwater into the inside of the duct or condensation inside the duct in the surrounding environment where this type of bus duct 1 is installed, particularly outdoors, the strip plate conductor 4 is connected to the insulating support member. There is a possibility that the insulation performance in the structure supported by 5 may deteriorate. When such insulation performance is degraded, a ground fault occurs. In order to prevent such a ground fault from occurring, it is an effective means to install a drainage dustproof device 11 in the housing 6 of the bus duct 1.

  As shown in FIGS. 1 and 2, the drainage dustproof device 11 in this embodiment includes a plate-like base portion 13 attached in close contact with the bottom plate portion 12 of the housing 6 of the bus duct 1, and the base portion 13. A cylindrical upper case portion 14 fixed to the bottom case, a bottomed cylindrical lower case portion 15 detachably attached to the upper case portion 14, a base portion 13, an upper case portion 14, and a lower case portion 15. A main part is constituted by a large number of spheres 17 as partition members arranged in the enclosed internal space 16.

As shown in FIG. 3, the base portion 13 has a square shape (one side L = 100 mm) and is made of a metal material such as stainless steel. The base portion 13 is attached in close contact by bolting to the bottom plate portion 12 of the housing 6 of the bus duct 1 through packing (not shown). The bolting is at the four corners of the base portion 13. Here, in the bottom plate part 12 of the housing 6 of the bus duct 1, a circular first water passage hole 18 (diameter d ₁ = 8 mm) is formed. On the other hand, three circular water passage holes 19 (diameter d ₂ = 5 mm) having a circular shape are formed in the central portion of the base portion 13.

Three second water passage holes 19 formed in the base portion 13 are arranged at equal intervals in the circumferential direction (120 ° equidistant) at the periphery of the first water passage hole 18 formed in the bottom plate portion 12 of the housing 6 of the bus duct 1. ). In this way, a part of the first water passage hole 18 is closed by the base portion 13 and the second water passage hole having a smaller diameter than the first water passage hole 18 (d ₁ = 8 mm) at the bottom plate portion 12 of the housing 6. By closing a part of 19 (d ₂ = 5 mm), by opening only at the overlapping portion of the first water passage hole 18 of the housing 6 and the second water passage hole 19 of the base portion 13, it is minimized. The opening part 10 (drainage part) is formed.

The upper case portion 14 has a cylindrical shape (outer diameter D ₁ = 60 mm, height H ₁ = 20 mm), and is made of a metal material such as stainless steel. The upper case portion 14 is fixed to the base portion 13 by welding. In addition, the upper case part 14 and the base part 13 can also be comprised with the single raw material formed integrally.

  A female screw 20 is engraved on the inner wall surface of the upper case portion 14. A screw 21 is screwed to the peripheral wall portion of the upper case portion 14 as a loosening prevention mechanism for fixing the lower case portion 15. The tip of the screw 21 can freely protrude and retract from the inner wall surface of the upper case portion 14.

The lower case portion 15 has a bottomed cylindrical shape (outer diameter D ₂ = 48 mm, height H ₂ = 30 mm), and is made of a metal material such as stainless steel. Five circular water passage holes 22 (diameter d ₃ = 5 mm) having a circular shape are formed in the central portion of the bottom portion of the lower case portion 15. As shown in FIG. 4, these third water holes 22 are equidistant from one water hole 22 formed in the center of the bottom portion and the circumference of the circumference having a diameter d ₄ = 12 mm at the center ( It is composed of four water passage holes 22 formed at an equal angle of 90 °.

  The lower case portion 15 is a screw-in type in which a male screw 23 is engraved on the outer wall surface thereof and is screwed into the female screw 20 of the upper case portion 14 by being inserted into the upper case portion 14. Further, a concave groove 24 is formed in the peripheral wall portion of the lower case portion 15 as a loosening prevention mechanism for fixing to the upper case portion 14. The lower case portion 15 is prevented from falling off by fitting the tip of the screw 21 into the concave groove 24.

The spherical body 17 (outer diameter d ₅ = 6.5 to 7.5 mm) is formed from the internal space 16 formed by the base portion 13, the upper case portion 14, and the lower case portion 15 as a water passage, so that the spherical body 17 (outer diameter d ₅ = 6.5 to 7.5 mm) It is preferable to use glass that does not easily rust and is less likely to deteriorate than a resin. By accommodating a large number (for example, 50) of the spheres 17 in the internal space 16, mainly the lower case part 15, the water passage in the internal space 16 has a labyrinth structure.

These spheres 17 are loaded on the bottom of the lower case portion 15 and partially block the third water passage holes 22 formed in the bottom. Since the outer diameter (d ₅ = 6.5 to 7.5 mm) of the sphere 17 is set larger than the diameter (d ₃ = 5 mm) of the third water passage hole 22 (d ₅ > d ₃ ), the sphere 17 does not completely block all the third water holes 22.

That is, by adopting the sphere 17 and setting the outer diameter d ₅ of the sphere 17 larger than the diameter d ₃ of the third water passage hole 22 as described above, for example, as shown in FIG. It is assumed that such mutual positional relationship is obtained. In this case, even if the spherical body 17 completely closes one third water passage hole 22 located in the center, two third water passages on the left and right sides of the third water passage hole 22 located around the third water passage hole 22 are illustrated. There is a slight gap between the hole 22 and the sphere 17, and the two upper and lower third water passage holes 22 shown in the figure are closer to the sphere 17 than the third water passage holes 22 located on the left and right. There will be a large gap, and there will be a part that opens completely when viewed from below.

  In the drainage dustproof device 11 of this embodiment, the first water passage hole 18 and the second water passage hole 19 are formed in the bottom plate portion 12 and the base portion 13 of the housing 6, and the third passage is formed in the bottom portion of the lower case portion 15. A water passage 22 is formed in the internal space 16 by the spherical body 17 formed in the internal space 16 formed with the water hole 22 and composed of the base portion 13, the upper case portion 14, and the lower case portion 15.

  Thereby, the water stored in the inside of the housing 6 is an extremely small opening 10 which is a superposed portion of the first water passage hole 18 of the bottom plate portion 12 of the housing 6 and the second water passage hole 19 of the base portion 13. From the third water passage hole 22 of the lower case portion 15 through the gap between the spheres accommodated in the inner space 16.

  In addition, a part of the third water hole 22 of the lower case portion 15 is blocked by the sphere 17 and a large number of spheres 17 exist in the internal space 16, and the first water hole 18 and the second water hole 19 are connected to each other. Since the overlapped portion is an extremely small opening 10, foreign matters such as dust and water can be reliably prevented from entering the inside of the housing 6.

  As described above, the triple structure of the first water hole 18 and the second water hole 19, the sphere 17, and the third water hole 22 exhibits a function that combines the desired drainage performance and dustproof performance. In addition, since it is not necessary to use the first water passage hole 18 formed in the bottom plate portion 12 of the housing 6 of the bus duct 1 as a screw hole, it is possible to install the drainage dustproof device 11 in the housing 6 of the existing bus duct 1. It is easy, and even when the plate thickness of the bottom plate portion 12 of the housing 6 is thin like the bus duct 1, the water draining dustproof device 11 can be easily installed.

  The base portion 13 in the drainage dustproof device 11 has a second water passage hole 19 having a diameter smaller than that of the first water passage hole 18 of the housing 6 on the center circumference of the first water passage hole 18 of the housing 6. By arranging them at equally spaced locations, a minimal opening 10 is formed at the overlapping portion of the first water holes 18 and the second water holes 19.

  In this way, a part of the first water passage hole 18 of the housing 6 is closed by the base portion 13 and a part of the second water passage hole 19 of the base portion 13 is closed by the bottom plate portion 12 of the housing 6. Thus, it becomes easy to form the extremely small opening 10 only by the overlapping portion of the second water flow hole 19 of the base portion 13 and the first water flow hole 18 of the housing 6, and the desired drainage performance and dust prevention Functions that combine both performance can be easily exhibited.

  In this embodiment, as a structure in which the lower case portion 15 is detachably attached to the upper case portion 14, a female screw 20 is formed on the inner wall surface of the upper case portion 14 and a male screw 23 is formed on the outer wall surface of the lower case portion 15. A structure in which the lower case portion 15 is screwed into the upper case portion 14 is employed.

  By adopting such a structure, the lower case portion 15 can be easily attached to and detached from the upper case portion 14, and the inside of the upper case portion 14 and the lower case portion 15 can be easily cleaned, or the inner space 16 can be The arranged spheres 17 can be easily exchanged. In addition, the volume of the internal space 16 can be adjusted according to the screwing amount of the lower case portion 15, and it becomes easy to increase or decrease the number of the spheres 17 according to the installation environment of the bus duct 1, and there is much dust. In the installation environment, the number of the spheres 17 can be easily increased.

  Further, in this embodiment, as a locking mechanism for fixing the lower case portion 15 to the upper case portion 14, the lower case portion 15 is screwed to the lower case portion 15 with a predetermined amount screwed into the upper case portion 14. A structure is adopted in which the tip of the screw 21 is protruded from the inner wall surface of the lower case portion 15 and is fitted into the groove 24 of the upper case portion 14. By providing such a loosening prevention mechanism, it is possible to reliably prevent the lower case portion 15 from dropping off from the upper case portion 14 even when an impact such as vibration is applied, and the drainage dustproof device 11 having excellent seismic performance is provided. Can be provided.

  In the above embodiment, a case where a large number of spheres 17 are used as a partition member having a water flow passage in the internal space 16 surrounded by the base portion 13, the upper case portion 14 and the lower case portion 15 as a labyrinth structure. As described above, instead of the sphere 17, as another partition member, a structure including the inner case portion 25 as shown in FIGS. 6 to 8 can be adopted. The same parts as those in the above-described embodiment shown in FIGS.

  The embodiment shown in FIGS. 6 to 8 includes a structure in which an inner case portion 25 is arranged as a partition member in an internal space 16 surrounded by the base portion 13, the upper case portion 14 and the lower case portion 15.

The inner case portion 25 has a bottomed cylindrical shape (outer diameter D ₃ = 30 mm, height H ₃ = 17 mm), and is made of a metal material such as stainless steel. The inner case portion 25 is fixed to the base portion 13 by welding. Four semicircular fourth water passage holes 26 (diameter d ₆ = 4 mm) are formed in the circumferential wall portion near the bottom of the inner case portion 25 at equal intervals in the circumferential direction (equal 90 °). ing. The fourth water passage hole 26 of the inner case portion 25 includes four third water passage holes 22 positioned around the five third water passage holes 22 formed at the bottom of the lower case portion 15. The positions in the circumferential direction are shifted.

  In the water draining dustproof device 11 of this embodiment, the inner case portion 25 is adopted as a partition member, four fourth water passage holes 26 are formed in the peripheral wall portion of the inner case portion 25, and the fourth water passage holes. 26 is arranged by shifting the circumferential direction position from the four third water holes 22 located in the periphery among the five third water holes 22 formed at the bottom of the lower case part 15. The water passage in the internal space 16 has a labyrinth structure.

  Thereby, the water stored in the inside of the housing 6 is an extremely small opening 10 which is a superposed portion of the first water passage hole 18 of the bottom plate portion 12 of the housing 6 and the second water passage hole 19 of the base portion 13. Can be quickly discharged from the third water passage hole 22 of the lower case portion 15 through the fourth water passage hole 26 of the inner case portion 25 accommodated in the inner space 16.

  Further, the circumferential position of the fourth water passage hole 26 of the inner case portion 25 is shifted from the third water passage hole 22 of the lower case portion 15, or the first water passage hole 18 and the second water passage hole 19. Therefore, it is possible to reliably prevent foreign matters such as dust and water from entering the inside of the housing 6.

  Thus, due to the triple structure of the first water hole 18, the second water hole 19, the fourth water hole 26, and the third water hole 22, it has the desired drainage performance and dustproof performance. Since the first water passage hole 18 formed in the bottom plate portion 12 of the housing 6 of the bus duct 1 does not need to be a screw hole while exhibiting the function, the draining and dustproof device 11 is attached to the housing 6 of the existing bus duct 1. It is easy to install, and even if the thickness of the bottom plate portion 12 of the housing 6 is thin like the bus duct 1, the water draining dustproof device 11 can be easily installed.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

6 Housing 12 Bottom plate part 13 Base part 14 Upper case part 15 Lower case part 16 Internal space 17 Partition member (sphere)
18 1st water flow hole 19 2nd water flow hole 20 Female thread 21 Locking prevention mechanism (screw)
22 Third water hole 23 Male screw 24 Lock mechanism (concave groove)

Claims (5)

  A plate-like base portion attached in close contact with the bottom plate portion of the housing and having a second water passage hole communicating with the first water passage hole formed in the bottom plate portion of the housing, and fixed to the base portion. A cylindrical upper case part, a bottomed cylindrical lower case part that is detachably attached to the upper case part and has a third water passage hole in the bottom part, and the base part, the upper case part, and the lower case part A drainage and dustproof device comprising: a partition member disposed in an internal space surrounded by a wall and having a water flow passage in the internal space having a labyrinth structure.   The drainage dustproof device according to claim 1, wherein the partition member is configured by a large number of spheres accommodated in a lower case portion.   The base portion has a second water passage hole having a diameter smaller than that of the first water passage hole of the housing at a plurality of positions around the first water passage hole of the housing. The drainage dustproof device according to claim 1 or 2, which is opened at a polymerization portion with a water passage hole.   The internal thread is formed on the inner wall surface of the upper case portion, the external thread is formed on the outer wall surface of the lower case portion, and the lower case portion is inserted into the upper case portion to be screwed together. The drainage dustproof device according to any one of the above.   The drainage and dustproof device according to any one of claims 1 to 4, further comprising a loosening prevention mechanism that fixes the lower case portion to the upper case portion.

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