JP3557421B2 - Bus duct housing - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bus duct housing, and more particularly to a two-part bus duct housing in which a pair of housing halves each having a storage recess for housing an insulated conductor are opposed to each other.
[0002]
[Prior art]
The bus duct is generally configured to house an insulated conductor in which a flat electric conductor is covered with an electric insulating layer in a bus duct housing.
[0003]
The bus duct configured in this way has an extremely excellent function of preventing fires and preventing magnetic flux leakage compared to a wiring system that bundles and wires multiple cables, so the main power supply in factory facilities and buildings, etc. Widely used for lines and the like.
[0004]
This bus duct is disclosed in, for example, Japanese Utility Model Publication No. 58-9472 and has a storage recess 101a having a U-shaped cross section as shown in FIG. 7, a flange portion 101b and a flange extending from both ends of an opening of the storage recess 101a. It has a pair of housing halves 101 comprising a reinforcing portion 101c provided along the outer edge of the portion 101b.
[0005]
Then, the pair of housing halves 101 are opposed to each other with the opening sides of the storage recesses 101a facing each other, the flanges 101b are joined to each other, and bolts 102 to be inserted into bolt insertion holes 101d formed in the flanges 101b joined to each other. To form a bus duct housing 103, and a plurality of insulated conductors 104 in which an electric conductor 104a is covered with an electric insulating layer 104b are stacked and accommodated in a conductor accommodating portion 103A formed by the opposed accommodating recesses 101a. ing.
[0006]
However, it is necessary to protect the insulated conductor from dust and the like in the bus duct configured as described above. Therefore, as disclosed in Japanese Utility Model Laid-Open Publication No. 50-85799 and Japanese Utility Model Publication No. 51-2317, opposed housings are required. There is a measure to prevent intrusion of dust or the like into the conductor housing by interposing a water-swelling foamable substance or a spacing adjusting member at the joint of the half bodies.
[0007]
[Problems to be solved by the invention]
In the prior art disclosed in the Japanese Utility Model Application Laid-Open No. 50-85799 or Japanese Utility Model Application Laid-Open No. 51-2317, a water-expandable foaming material or a spacing adjusting member is interposed at the joint between the opposite housing halves. Therefore, intrusion of dust and the like into the conductor housing is prevented, and protection of the insulated conductor is obtained.
[0008]
However, since the bus duct housing is relatively long and heavy, the work of assembling the bus duct in which a water-swelling foam material or a spacing adjusting member is interposed at the joint becomes complicated, resulting in poor workability and an increase in manufacturing cost, In addition, since the opposing housing halves are only connected to each other by bolts, sufficient mechanical strength of the bus duct housing cannot be obtained, and the bus duct may be deformed particularly when an external force such as a load or impact acts on the reinforcing portion. There is a defect such as
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent the insulation-coated conductor from being damaged due to the bite of the insulation-coated conductor, to ensure sufficient strength and to prevent entry of dust and the like, and An object of the present invention is to provide a bus duct housing capable of reducing manufacturing costs.
[0010]
[Means for Solving the Problems]
The bus duct housing according to claim 1, which achieves the above object,
A pair of housing halves having a storage concave portion having a U-shaped cross section, a flange portion extending at both ends of the opening portion of the storage concave portion and formed so as to be separated from each other, and a reinforcing portion additionally formed at an edge of the flange portion. In the bus duct housing which joins the flange portions to each other and accommodates the insulated conductor in the conductor accommodating portion formed by the opposed accommodating recesses and couples the flange portions joined to each other, the reinforcing portion is It is configured to have a closed cross-sectional shape.
[0011]
Since the reinforcing portion has the closed cross-sectional shape, the mechanical strength of the bus duct housing is ensured, and further, dust and the like are prevented from entering the conductor accommodating portion.
[0012]
The bus duct housing according to claim 2 is
A first reinforcing portion extending outward so as to be separated from the joined flange portion, and a reinforcing portion extending substantially parallel to the flange portion from an outer end of the first reinforcing portion; The second reinforcing portion includes a third reinforcing portion extending from the end of the second reinforcing portion so as to be close to each other. The closed cross-sectional shape of the reinforcing portion is such that the ends of the third reinforcing portion are mutually connected. To form an engaging portion.
[0013]
According to this configuration, in addition to the same operation as that of the bus duct housing of the first aspect, the relative positioning of the opposing housing halves is automatically performed due to the presence of the engaging portion, and the efficiency of the assembling work can be improved, and In addition, the mechanical strength of the bus duct housing is improved with the integral engagement of the reinforcing portions to be joined.
[0014]
The bus duct housing according to claim 3 is
The engaging portion has a stepped portion corresponding to the thickness of the end of the other third reinforcing portion at the end of one third reinforcing portion, and the end of the other third reinforcing portion. And the step portion.
[0015]
According to this configuration, as a result of the engagement of the third reinforcing portions, the outer surface of the engaging portion is formed to be flat and continuous, so that in addition to the operation according to the third aspect of the present invention, assembling and handling of the bus duct housing. There is no danger of the operator being injured by hand or the like during the operation, and the safety of the operation can be ensured.
[0016]
The bus duct housing according to claim 4 is
An engaging recess is formed at an inner end of the first reinforcing portion of one of the reinforcing portions, and is engaged with the engaging recess in the joined state at an inner end of the first reinforcing portion of the other reinforcing portion. An engaging portion is formed by providing a mating projection.
[0017]
With this configuration, the mechanical strength of the bus duct housing and the function of preventing dust and the like from entering the conductor accommodating portion are further improved.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of a bus duct housing according to the present invention will be described with reference to FIGS.
[0019]
FIG. 1 is a perspective view of a bus duct 1. The bus duct 1 has an insulated conductor 13 in which an electric conductor 11 made of, for example, aluminum or copper is covered with an electric insulating layer 12 such as a polyester sheet in a rectangular or cross-sectional rectangular flat plate shape. And a bus duct housing 20 for stacking and holding a plurality of insulated conductors 13.
[0020]
The bus duct housing 20 is formed by a two-piece body formed by a pair of housing halves 21 having the same cross section and opposed to each other.
[0021]
Each housing half 21 has a storage recess 22 having a U-shaped cross section, and flange portions 23 and 24 and flange portions 23 having predetermined widths extending along both ends of the opening of the storage recess 22 so as to be separated from each other. 24 have reinforcing portions 25 and 26 additionally formed along the outer edge.
[0022]
As shown in the cross section taken along the line AA in FIG. 1, the reinforcing portions 25 and 26 are first reinforcing portions 25a and 26a that extend outward so as to be separated from each other by the flange portions 23 and 24 that are joined to each other. And second reinforcing portions 25b and 26b extending substantially in parallel with the flange portions 23 and 24 so as to face each other from outer ends of the first reinforcing portions 25a and 26a, and end portions of the second reinforcing portions 25b and 26b. And a third reinforcing portion 25c, 26c extending so as to be close to each other. The cross-sectional shape is substantially U-shaped or U-shaped, and both side edges of the bus duct housing 20 cooperate with the opposing reinforcing portions 25, 26. To form a pair of closed cross-sectional shapes.
[0023]
The outer end surfaces 25b 'and 26b' of the second reinforcing portions 25b and 26b of the reinforcing portions 25 and 26 are formed at least partially flush with the outer surface 22 'of the storage recess 22.
[0024]
The inner end of the third reinforcing portion 25c forming one reinforcing portion 25 has a step size corresponding to the thickness of the inner edge 27a of the third reinforcing portion 26c forming the other reinforcing portion 26, and is reinforced. Steps 27b formed in the portions 25 and 26 are provided. The engagement between the inner edge 27a and the step 27b connects the inner ends of the third reinforcing portions 25c and 26c to each other. The joint 27 is formed.
[0025]
The outer surfaces of the third reinforcing portions 25c and 26c joined to each other by fitting the inner edge 27a of the engaging portion 27 and the step portion 27b are flat and continuous, and the opposing two housing halves 21 are opposed to each other. Is regulated, and the two housing halves 21 are positioned relative to each other.
[0026]
Furthermore, the bus duct housing 20 has coupling means 28 for coupling the flange portions 23 and 24 of the housing halves 21 facing each other. As shown in FIG. 2, the coupling means 28 includes bolts 28c and 28c which are inserted into bolt insertion holes 23a and 24a formed respectively in the flange portions 23 and 24 of the housing half 21 via spring washers 28a and washers 28b. The two flange portions 23 and 24 are configured to be tightened and fixed by a nut 28d screwed into the nut.
[0027]
The connecting means 28 is provided so as not to protrude from the outer end surfaces 25b ', 26b' of the second reinforcing portions 25b, 26b of the two housing halves 21, i.e., the outer surface 22 'and the outer end surfaces 25b', 26b 'of the storage recess 22. It is configured not to protrude outward from the connecting virtual line 29.
[0028]
Next, an operation of assembling the bus duct 1 configured as described above will be described. First, a plurality of insulation-coated conductors 13 in which the flat electric conductor 11 is covered with an electric insulation layer 12 are stacked in a storage recess 22 formed in one housing half 21, and three layers in this embodiment.
[0029]
Next, the housing half 21 is placed in the housing recess 22 of the other housing half 21 so as to house the insulated conductor 13 protruding from the housing recess 22 in the housing recess 22 of the one housing half 21. The insulating covering conductor 13 is accommodated and fixed in the conductor accommodating portion 20A formed by the pair of accommodating recesses 22 facing each other, and the inner edge 27a of the coupling portion 27 and the step portion 27b are fitted to be opposed to each other. Relative positioning of the housing halves 21 is performed.
[0030]
Then, with the housing halves 21 facing each other being engaged and positioned, spring washers 28a and washers 28b are interposed in bolt insertion holes 23a and 24a respectively formed in the flange portions 23 and 24 of each housing half 21 in advance. The flanges 23 and 24 are pressed and fixed by the inserted bolt 28c and the nut 28d screwed to the bolt 28c.
[0031]
According to the bus duct housing 20 configured as above, the pair of housing halves 21 face each other so that the opening sides of the storage recesses 22 face each other, and the flange portions 23 and 24 are joined to form the engagement portion 27. The inner edge 27a and the stepped portion 27b are engaged with each other, the relative movement of the opposing housing halves 21 is regulated, relative positioning is automatically performed, and the engaging portion 27 is Since it is formed to be separated from the housing recess 22 through 24, the electrical insulating layer 12 of the insulating covering 13 housed in the conductor housing 20A is prevented from being caught by the engaging portion 27 during assembly, and insulation is achieved. The assembly can be assembled very efficiently without causing damage to the cover 13.
[0032]
Further, the outer surfaces of the third reinforcing portions 25c and 26c joined to each other by engaging the inner edge 27a of the engaging portion 27 and the step portion 27b are formed so as to be flat and continuous, so that the bus duct housing 20 is assembled. In addition, there is no possibility that the worker may injure his hand or the like accidentally during the handling operation, and the safety of the operation can be ensured.
[0033]
Further, the inside ends of the reinforcing portions 25, 26 to be joined are integrally connected by the engaging portions 27, and the reinforcing portions 25, 26 form a closed cross-sectional shape extending longitudinally along both side edges of the bus duct housing 20. As a result, the mechanical strength of the bus duct housing 20 is ensured, and the intrusion of dust and the like into the conductor accommodating portion 20A is prevented by the engaging portion 27 engaging between the reinforcing portions 25 and 26.
[0034]
On the other hand, the outer end surfaces 25b ', 26b' of the second reinforcing portions 25b, 26b of the reinforcing portions 25, 26 and the outer surface 22 'of the storage recess 22 are formed flush with each other, and the coupling means 28 is provided outside the storage recess 22. In combination with the fact that it is located within the imaginary line 29 connecting the surface portion 22 'and the outer end surfaces 25b', 26b 'of the second reinforcing portions 25b, 26b, especially when the bus duct 1 is arranged horizontally, for example, as shown in FIG. When the bus duct 1 is disposed on the floor L as described above, the load of the bus duct 1 is dispersed and supported by the storage recess 22 in contact with the floor L and the reinforcing portions 25 and 26.
[0035]
Accordingly, downward bending deformation of the storage recess 22 for storing the insulated conductor 13 is prevented, and damage to the insulated conductor 13, particularly the electric insulating layer 12 is avoided, and the conductor is stored by an impact load caused by an earthquake or the like. Various accidents such as vertical vibration of the portion 20A can be prevented.
[0036]
Further, since the outer end surfaces 25b 'and 26b' of the second reinforcing portions 25b and 26b and the outer surface 22 'of the storage recess 22 are flush with each other, the sectional shape of the space occupied by the bus duct 1 becomes substantially rectangular. Packing work is extremely easy and is stably maintained during loading for transportation, storage and the like. Further, since the cross-sectional shapes of the opposing housing halves 21 are formed to be the same, management such as manufacturing and storage becomes easy, and cost reduction can be expected.
[0037]
Next, a second embodiment of the bus duct housing according to the present invention will be described with reference to FIG.
[0038]
FIG. 4 is a cross-sectional view of a main part of the bus duct housing according to the present embodiment, and the detailed description is omitted by assigning the same reference numerals to parts corresponding to FIGS. 1 to 3, but the bus duct housing according to the first embodiment is omitted. 20 to further improve the strength.
[0039]
Specifically, an engagement recess 30a is formed at the inner end of the first reinforcing portion 25a of the one reinforcing portion 25 or the first reinforcing portion 26a of the other reinforcing portion 26, for example, at the inner end of the first reinforcing portion 26a. The engaging portion 30 is formed by forming an engaging protrusion 30b that fits into the engaging concave portion 30a at the inner end of the other first reinforcing portion 25a.
[0040]
With such a configuration, the inner ends of the third reinforcing portions 25c and 26c of the reinforcing portions 25 and 26 are engaged with each other by the engaging portion 27, as compared with the bus duct housing 20 in the first embodiment. The inner ends of the reinforcing portions 25a and 26a are engaged with each other by the engaging portions 30, and the strength of the bus duct housing 20 is further increased, so that the strength of the bus duct is more reliably improved. The intrusion of dust and the like can be more reliably achieved.
[0041]
In each of the embodiments described above, the two housing halves 21 are connected to each other by the bolts 28c and the nuts 28d inserted into the bolt insertion holes 23a and 24a opened in the flange portions 23 and 24 of the opposing housing halves 21, respectively. Although 20 is formed, it is also possible to improve the efficiency of the manufacturing operation by connecting the two housing halves 21 by omitting preliminary processing such as drilling of the bolt insertion holes 23a and 24a.
[0042]
Next, a connecting means which does not require the preliminary processing will be described with reference to FIG. In FIG. 5, detailed description is omitted by giving the same reference numerals to parts corresponding to those in FIG. 1, but the flange portions 23 and 24 of the housing half 21 used here are not provided with bolt insertion holes or the like. No pre-processing has been performed.
[0043]
First, as shown in FIG. 5 (A), a pair of housing halves 21 are opposed to each other, and an insulated conductor (not shown) is accommodated and fixed in a conductor accommodating portion 20A formed by a pair of opposed accommodating recesses 22. At the same time, the inside edge 27a of the engaging portion 27 and the step portion 27b are engaged with each other to position the housing half 21 relatively.
[0044]
Then, the overlapping flange portions 23 and 24 are riveted. The rivet 41 is a tubular rivet having a hollow portion in the shaft 41a as shown in FIG. 5 (A). The other flange portion 23 is extended and expanded by the tip of 41a to be caulked and connected.
[0045]
As shown in the cross section in FIG. 5B, the bus duct housing 20 joined by the rivets 41 has extremely few projecting portions from the flange portions 23 and 24, and has a smaller bolt insertion hole than the bolting connection method. Preliminary work such as installation is not required, and the work of tightening bolts and the like can be omitted, the work can be simplified, and it can be performed efficiently in a short time and at low cost.
[0046]
Another connecting means will be described with reference to FIG. Note that the same reference numerals are given to portions corresponding to those in FIG.
[0047]
First, as shown in FIG. 6 (A), the housing halves 21 are opposed to each other to accommodate and fix an insulated conductor (not shown) in the conductor accommodating portion 20A, and to associate the inner edge 27a with the step portion 27b. In addition, relative positioning of the opposing housing halves 21 is performed.
[0048]
Subsequently, the flange portions 23 and 24 overlapping each other are clamped by a pair of electrodes 42 facing each other, and a current is applied between the electrodes 42 in a pressurized state to form a nugget 43 at the joint portion and to weld by so-called spot welding. Join.
[0049]
As shown in FIG. 6 (B), the bus duct housing 20 joined by spot welding has no projecting portions on its flange portions 23 and 24, and the weight is reduced as compared with the joining method by bolting. Preliminary processing such as drilling of an insertion hole is not required, so that the operation can be simplified, and it can be performed efficiently and in a very short time at low cost.
[0050]
In addition, these joining methods using rivets or spot welding make it very easy to add a joining portion as necessary even after the completion of the assembly of the bus duct housing.
[0051]
【The invention's effect】
According to the bus duct housing of the present invention described above, the strength of the bus duct housing, the prevention of intrusion of dust and the like into the bus duct housing, the safety of work can be ensured, and the manufacturing is easy and the manufacturing cost can be reduced. Has the effect of
[Brief description of the drawings]
FIG. 1 is a perspective view of a bus duct illustrating a first embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is an explanatory diagram showing a use state of a bus duct.
FIG. 4 is a cross-sectional view of a principal part showing a second embodiment of the present invention.
5A and 5B are explanatory views of a connecting means used for a bus duct housing according to the present invention, wherein FIG. 5A is an explanatory view of a connecting means by rivets, and FIG. It is a fragmentary sectional view.
6A and 6B are explanatory views of a connecting means used for a bus duct housing according to the present invention, wherein FIG. 6A is an explanatory view of a connecting means by spot welding, and FIG. 6B is a diagram showing a bus duct housing connected by a connecting means by spot welding; It is principal part sectional drawing of.
FIG. 7 is a perspective view illustrating a conventional bus duct housing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Bus duct 13 Insulated covering conductor 20 Bus duct housing 20A Conductor storage part 21 Housing half 22 Storage concave part 22 'Outer side part 23 Flange part 24 Flange part 25 Reinforcement part 26 Reinforcement part 28 Coupling means 30 Coupling means

Claims (4)

A pair of housing halves having a storage concave portion having a U-shaped cross section, a flange portion extending at both ends of the opening portion of the storage concave portion and formed so as to be separated from each other, and a reinforcing portion additionally formed at an edge of the flange portion. In a bus duct housing for joining a body to each other with the flange portions, accommodating an insulating-coated conductor in a conductor accommodating portion formed by the opposed accommodating recesses, and coupling the flange portions joined to each other,
The bus duct housing, wherein the reinforcing portion has a closed cross-sectional shape. The reinforcing portion,
A first reinforcing portion extending outwardly so as to be separated from the joined flange portion, and a second reinforcing portion extending substantially parallel to the flange portion from an outer end of the first reinforcing portion. And a third reinforcing portion extending from the end of the second reinforcing portion so as to approach each other,
The closed cross-sectional shape of the reinforcing portion,
2. The bus duct housing according to claim 1, wherein the end portions of the third reinforcement portion are connected to each other to form an engagement portion. 3. The engagement portion includes:
An end of one of the third reinforcing portions is provided with a step-like step corresponding to the thickness of the end of the other third reinforcing portion, and the step between the end of the other third reinforcing portion and the step is provided. The bus duct housing according to claim 2, wherein the bus duct housing is formed by engagement. One engagement recess provided in the inner end of the first reinforcement portion of the reinforcement part, engaged to be fitted before Symbol engaging recess in the joined state to the inner end of the first reinforcing portion of the other of the reinforcing portion 4. The bus duct housing according to claim 2, wherein an engaging portion is formed by providing a mating projection.

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