JP5410193B2 - Duct connection structure - Google Patents

Description

  The present invention relates to a duct connection structure.

For example, as shown in Patent Document 1, a conductor or a cable connected to a transformer may be disposed in a duct (see FIGS. 3 and 4 of Patent Document 1).
In the example of Patent Document 1, an upper duct is disposed so as to cover the bushing protruding upward from the upper surface of the cover of the transformer body, and the cable duct is connected to the end side of the upper duct, The cable is wired and its end is connected to the conductor. The conductor is led out from the bushing and supported by a support base.

  When a transformer having a duct as shown in FIG. 3 of Patent Document 1 is installed in a customer premises, the transformer side duct and the customer side duct are connected to each other, and the transformer is installed. There is.

  Each duct has a substantially rectangular parallelepiped shape, and the opening surface is substantially the same shape. The duct is formed of a metal conductor, and a space portion through which a cable or conductor, for example, a charging portion drawn from a transformer is passed. Have. The duct opening is provided with a flange.

When connecting the ducts, the flanges at the openings of the ducts are connected to each other, and a packing is inserted between them to connect them with bolts or the like.
By providing packing on the flange joint surface between the ducts, it is possible to prevent the intrusion of rainwater etc. even when installing a transformer outdoors, and it works to prevent corrosion of the conductor in the duct and to maintain insulation between the ducts. .

  However, the distance between the flanges may be larger than the original design due to installation position errors and other factors. When the distance between the flanges increases between the duct on the transformer side and the duct on the customer side (causes dimensional errors), the connection between the ducts The metal plate of a spacer can be provided and the distance between the flange surfaces of both ducts can be adjusted. In this way, the connection between the ducts with the customer can be easily adjusted by inserting the spacer even with respect to the design error.

  Further, when a large dimensional error with the customer occurs in connection between the ducts, a plurality of spacers may be provided instead of one. For example, a plurality of spacers may be provided as shown in FIG.

  In FIG. 9, it is an expanded sectional view of the connection part between ducts, and a plurality of spacers are provided. 100 is a duct, 100a is a flange at the opening of the duct 100, a plurality of spacers 101 are provided between the flanges 100a, and a packing 102 is provided between the flanges 100a and the spacers 101 and between the plurality of spacers 101. These are connected together by bolts 103.

  However, when there is a high-voltage charging unit in each duct 100 as in this case, a floating potential is generated in the duct 100 itself. In order to prevent human electric shock due to the floating potential of these ducts 100, all of the ducts 100 and the flanges 100a are grounded from a grounding terminal (not shown) attached to the duct 100 via a lead wire (not shown).

Japanese Utility Model Publication No. 5-23735

However, when one spacer is provided between the flanges of the duct, or when a plurality of spacers 101 are provided as shown in FIG. 9, if the bolt 103 and the spacer 101 are not sufficiently fitted, the spacer 101 is connected to the duct 100. Since there is no electrical conduction path, there is a possibility that sufficient grounding cannot be obtained.
In such a case, a floating potential is generated in the spacer 101, and when a person approaches the spacer, there is a risk of electric shock, which is dangerous.

  An object of the present invention is to provide a duct connection structure that reliably grounds a spacer in view of the above points.

  In order to solve the above-described problems, the present invention provides a duct connection by inserting an adjusting structure between the flange surfaces of both ducts to be connected when ducts having substantially the same flange surface shape are connected. This is related to a duct connection structure in which the distance between both flange surfaces can be adjusted.

  The invention according to claim 1 is a structure in which the adjustment structure is a structure in which one conductor spacer and an insulating elastic member arranged so as to sandwich the spacer are overlapped, and the elastic member is It is a thin plate shape having substantially the same planar shape as the flange surface of the duct, and the conductive spacer has a thin plate planar shape that overlaps with the elastic member, and at least a part protrudes to the outer peripheral side from the elastic member. It has a protrusion and forms a first electrical conduction path that is electrically connected between the protrusion of the spacer and at least one of the two ducts.

  In the invention according to claim 2, the adjustment structure is a structure in which a plurality of insulator elastic members and a plurality of conductor spacers are alternately overlapped, and the elastic member is a flange surface of the duct. The conductive spacer has a thin plate shape that overlaps with the elastic member, and at least a portion that protrudes to the outer peripheral side of the elastic member. Forming a first electrical conduction path electrically connected between the protrusion of the spacer and at least one of the two ducts, and electrically connecting all of the protrusions of the plurality of spacers to each other. A second electrical conduction path to be connected is formed.

  According to a third aspect of the present invention, the second electrical conduction path is formed by providing an adjustment conductor between the protrusions of the plurality of spacers.

  According to the fourth aspect of the present invention, all the protruding portions of the plurality of spacers and all the plurality of adjusting conductors are penetrated and connected by the first connecting means.

  According to a fifth aspect of the present invention, a plurality of spacers are provided by providing protrusions in a direction perpendicular to the planes of the protrusions of the plurality of spacers so that the protrusions of the plurality of spacers contact each other by the protrusions. A second electrical conduction path is formed between the protrusions.

  According to the sixth aspect of the present invention, the protruding portions of the plurality of spacers are penetrated and connected by the first connecting means.

  According to the seventh aspect of the present invention, an elastic member is disposed on the flange surface side of the adjustment structure.

  The invention according to claim 8 is the one in which the flange surfaces of both ducts and the adjustment structure are penetrated and connected by the second connecting means.

  According to the ninth aspect of the present invention, a conductor having a charging part is arranged in a non-contact state with the duct inside the duct.

  In the invention according to claim 10, the duct is grounded directly or indirectly.

  According to the present invention, since the spacer is securely grounded, there is no risk of electric shock even if a person approaches the spacer.

BRIEF DESCRIPTION OF THE DRAWINGS The whole figure in the 1st Embodiment of this invention is shown. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. It is an enlarged view of the Y section of FIG. It is the plain view which showed an example of the structure of a spacer. The principal part of the 2nd Embodiment of this invention is shown, and other embodiment of the enlarged view of the Y section of FIG. 2 is shown. The principal part of the 3rd Embodiment of this invention is shown, and other embodiment of the enlarged view of the Y section of FIG. 2 is shown. The principal part of this invention is shown, and other embodiment of the enlarged view of the Y section of FIG. 2 is shown. The principal part of this invention is shown, and other embodiment of the enlarged view of the Y section of FIG. 2 is shown. FIG. 3 shows a prior art of an enlarged view of a Y part in FIG. 2.

<First Embodiment>
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 4 show the main part of a first embodiment of a duct connection structure according to the present invention. FIG. 1 is an overall view including a transformer, and FIG. 2 is a line II-II in FIG. FIG. 3 is an enlarged view of a Y portion in FIG. 2. FIG. 4 is a plan view showing an example of the structure of the spacer.

  1 to 4, reference numeral 1 denotes a transformer having a high voltage on both the primary and secondary sides, 2 denotes a primary bushing protruding upward from the upper surface of the cover of the transformer 1, and the conductor 3 is drawn from the primary bushing 2. It is. Among the conductors 3, the conductor 3 is composed of a conductor 3 a that is pulled out horizontally from the primary bushing 2 as shown in FIG. 1, and then a conductor 3 b that is drawn vertically downward, and the conductors 3 a and 3 b are not shown. Connected at the intersections by bolts.

  Further, an upper duct 4 is disposed so as to cover the conductor 3a and the primary bushing 2, and a first duct 5 is disposed on the end side of the upper duct 4 so as to cover the conductor 3a and the conductor 3b. In addition, a second duct 6 is disposed below the first duct 5 and covers the conductor 3b.

  The conductor 3b is held and fixed by an insulating support 19 attached to the inside of the first duct 5.

  For example, the first duct 5 is connected to a second duct 6 that is a customer-side facility.

  The ducts 5 and 6 are provided for safety so as not to get an electric shock even when a person approaches by covering the high voltage conductor 3 so that the person does not touch the high voltage conductor 3 directly. In addition, it has a substantially rectangular parallelepiped shape, is composed of a steel plate (material: iron or stainless steel, etc.) that is a metal conductor, and has a cavity for allowing the lead-out conductor 3 on the primary side to pass therethrough. , Openings are formed at both ends. Further, as shown in FIG. 3, the ducts 5 and 6 are provided with ground terminals 5b and 6b, respectively, and are grounded via the ground terminals 5b and 6b so that no floating potential is generated.

  Specifically, the ground terminals 5b and 6b are internally threaded. A crimp terminal 14a connected to one end of the lead wire 14 is connected to the ground terminal 5b with a bolt 13, and the other end is grounded by means (not shown). Further, the crimp terminal 12a connected to one end of the lead wire 12 is connected to the ground terminal 6b with a bolt 11, and the other end is grounded by means not shown. With such a configuration, the ducts 5 and 6 are grounded via the ground terminals 5b and 6b.

  Flanges 5a and 6a are provided at the outer edges of the openings of the ducts 5 and 6, and the flanges 5a and 6a are provided on the entire outer periphery while maintaining a predetermined width along the edges of the openings of the ducts 5 and 6. It has been. Since the flanges 5a and 6a are also part of the duct, they are grounded via the ground terminals 5b and 6b of the ducts 5 and 6.

  When connecting the 1st duct 5 and the 2nd duct 6, it is normally connected only between packing between each flange 5a and 6a. However, the distance between the flanges 5a and 6a may be larger than the original design due to an installation position error and other factors. Therefore, the adjustment structure 7 for taking into account the dimensional error between the two ducts is inserted between the flanges 5a and 5b of the respective ducts so as to adjust the dimensions between the flanges 5a and 5b.

  The adjustment structure 7 includes two packings 7a and one spacer 7b, and packings 7a are disposed between the flange 5a and the spacer 7b and between the spacer 7b and the flange 6a, respectively.

  The packing 7a has a thin plate shape substantially the same shape as the flanges 5a and 6a, and is formed of an elastic member.

  As shown in FIG. 4, the spacer 7b has a thin plate shape substantially the same as the flanges 5a, 6a and the packing 7a, but a square of a thin plate partially protruding toward the outer peripheral side than the flanges 5a, 6a and the packing 7a. A protruding portion 7b1 having a shape is provided. Reference numeral 7b2 denotes a bolt through hole for allowing a bolt to pass through the protruding portion 7b1. Similarly, 7b3 is a plurality of through holes for passing bolts for connecting the flanges 5a and 6a.

  The spacer 7b is made of a metal conductor (material: iron, stainless steel, etc.), and the high-voltage conductor 3 passes through the spacer 7b. There is a risk of electric shock when approaching. Therefore, it is necessary to eliminate the floating potential of the spacer 7b. Hereinafter, the grounding means of the spacer 7b will be described.

  A first electrical conduction path 10 that is electrically connected is formed between the protrusion 7b1 of the spacer 7b and the second duct 6.

  The first electrical conduction path 10 includes a lead wire 10b and crimp terminals 10a and 10c connected to both ends thereof.

  Further, in order to form the first electrical conduction path 10 between the protruding portion 7b1 and the second duct 6, the protruding portion 7b1 and the crimp terminal 10a are penetrated by the first connecting means 8 and connected. The first connecting means 8 is constituted by a bolt 8a and a nut 8b, and the projecting portion 7b1 (through the bolt 8a through the bolt through hole 7b2) and the crimp terminal 10a are connected by the bolt 8a and the nut 8b.

  The crimp terminal 10c is connected to the ground terminal 6b with a bolt 11. That is, the crimp terminals 10c and 12a are connected to the ground terminal 6b by the bolt 11. By connecting in this way, the first electrical conduction path 10 is formed.

  With the above configuration, the spacer 7b can be grounded from the protruding portion 7b1 via the ground terminal 6b.

  Further, both the flanges 5a, 6a and the adjustment structure 7 are penetrated and connected by the second connecting means 9. The second connecting means 9 is constituted by a bolt 9a and a nut 9b, and both the flanges 5a and 6a and the adjusting structure 7 are penetrated and connected by the bolt 9a and the nut 9b.

  In the first embodiment of the present invention, the spacer 7b may be grounded without providing the first electrical conduction path 10. Specifically, both the flanges 5a and 6a and the spacer 7b (the bolt 9a is passed through the bolt through hole 7b3) are connected and fitted with the bolt 9a and the nut 9b, so that the spacer 7b is grounded. . However, if the bolt 9a and the bolt through hole 7b3 of the spacer 7b are not sufficiently fitted, a floating potential is generated in the spacer 7b. Therefore, in the present invention, the first electrical conduction path 10 is provided in order to more reliably ground the spacer 7b.

<Second Embodiment>
FIG. 5 shows the main part of the second embodiment of the duct connection structure according to the present invention, and shows another embodiment of the enlarged view of the Y part of FIG.

  In the second embodiment, an example in which a plurality of spacers 7b are present and the plurality of spacers 7b are grounded will be introduced.

  In FIG. 5, the adjustment structure 7 is provided with a plurality of spacers 7b and a plurality of packings 7a alternately stacked. In addition, packing 7a is arrange | positioned to both flange 5a, 6a surface.

  Also in the second embodiment, the plurality of spacers 7b may be grounded by the bolts 9a and nuts 9b of the second connecting means 9. Specifically, since the bolts 9a are connected and fitted to both flanges 5a, 6a and a plurality of spacers 7b (the bolts 9a are passed through the bolt through holes 7b3), the plurality of spacers 7b are grounded. However, if the bolt 9a and the bolt through holes 7b3 of the plurality of spacers 7b are not sufficiently fitted, a floating potential is generated in the spacer 7b that is not sufficiently fitted.

  Also in the second embodiment, the first electrical conduction path is provided as in the first embodiment, but a second electrical conduction path 17 is newly provided.

  The second electrical conduction path 17 is an electrical conduction path formed between the plurality of spacers 7b. Conductor adjusting conductors 18 are provided between the protrusions 7b1 of the plurality of spacers 7b. The adjusting conductor 18 has the same planar shape as the protrusion 7b1 of the spacer 7b, but is somewhat smaller. The thickness is substantially the same as that of the packing 7a, and a bolt through hole (not shown) for penetrating the bolt is also provided.

  By connecting the projecting portions 7b1 of the plurality of spacers 7b and the plurality of adjusting conductors 18 with the bolts 8a and the nuts 8b of the first connecting means 8 so as to make sufficient surface contact with each other, the second electric A conduction path 17 can be formed.

  From the above, the plurality of spacers 7 b can be grounded together by the first electrical conduction path 10 and the second electrical conduction path 17.

<Third Embodiment>
FIG. 6 shows the main part of the third embodiment of the duct connection structure according to the present invention, and shows another embodiment of the enlarged view of the Y part of FIG.

  In the third embodiment, another example of the second electrical conduction path 17 is shown.

  In FIG. 6, the protruding portions 7b1 of the plurality of spacers 7b are provided with protruding portions 7b4 in a direction perpendicular to the plane of the protruding portions 7b1.

  The convex portion 7b4 is a part of the spacer 7b, has the same planar shape as the protruding portion 7b1, and is substantially the same in thickness as the packing 7a.

  By connecting the protrusions 7b1 of the plurality of spacers 7b and the plurality of projections 7b4 in a plane with the bolts 8a and the nuts 8b of the first connecting means 8 so as to sufficiently contact each other, the second electrical conduction path is obtained. 17 can be formed.

  In the first to third embodiments, the first electrical conduction path 10 is formed via the ground terminal 6b, but may be formed via the ground terminal 5b. Alternatively, the crimp terminal 10a of the first electrical conduction path 10 may be connected to the bolt 8a side.

  As shown in FIG. 7, the first electrical conduction path 10 includes a protrusion 7b1 (one on the flange 5a side) and the first duct 5 of the spacer 7b, and a protrusion 7b1 (one on the flange 6a side) and the first The two ducts 6 may be formed.

  Further, the first electrical conduction path 10 may be formed via the protrusion 7b1 (one on the flange 6a side) of the spacer 7b and the nut 9b of the second connection means 9. Further, as shown in FIG. 8, the protrusion 7b1 (one on the flange 6a side) of the spacer 7b and the nut 9b of the second connecting means 9, and the protrusion 7b1 (one on the flange 5a side) and the second connection. It may be formed on both the bolts 9a of the means 9.

  Further, in FIG. 4, the protruding portion 7b1 of the spacer 7b is provided in a part, but it may be provided on one side or the entire circumference and several other places.

3 Conductor 5, 6 Duct 5a, 6a Flange
7 Adjustment structure 7a Elastic member 7b Spacer 7b1 Projection 7b4 Projection 8 First connection means 9 Second connection means 10 First electrical conduction path 17 Second electrical conduction path 18 Conductor for adjustment

Claims (10)

When connecting ducts with substantially the same flange surface shape, the distance between both flange surfaces when connecting the ducts can be adjusted by inserting an adjustment structure between the flange surfaces of both of the connected ducts. The duct connection structure
The adjustment structure is a structure in which a single spacer made of a conductor and an elastic member made of an insulator arranged so as to sandwich the spacer are overlapped,
The elastic member is a thin plate having a plane shape substantially the same as the flange surface of the duct,
The conductor spacer has a thin plate shape in a portion overlapping with the elastic member, and at least a portion has a protruding portion protruding to the outer peripheral side than the elastic member,
A duct connection structure characterized in that a first electrical conduction path that is electrically connected is formed between at least one duct of the protrusion of the spacer and the two ducts. When connecting ducts with substantially the same flange surface shape, the distance between both flange surfaces when connecting the ducts can be adjusted by inserting an adjustment structure between the flange surfaces of both of the connected ducts. The duct connection structure
The adjustment structure is a structure in which a plurality of insulator elastic members and a plurality of conductor spacers are alternately stacked,
The elastic member is a thin plate having a plane shape substantially the same as the flange surface of the duct,
The conductor spacer has a thin plate shape in a portion overlapping with the elastic member, and at least a portion has a protruding portion protruding to the outer peripheral side than the elastic member,
Forming a first electrical conduction path electrically connected between at least one duct of the protrusions of the spacer and the two ducts, and electrically connecting all of the protrusions of the plurality of spacers; A duct connection structure characterized in that a second electrical conduction path is formed.   3. The duct connection structure according to claim 2, wherein the second electrical conduction path is formed by providing an adjustment conductor between the protrusions of the plurality of spacers. 4.   4. The duct connection structure according to claim 3, wherein all of the protrusions of the plurality of spacers and all of the plurality of adjusting conductors are penetrated and connected by the first connecting means.   Protrusions are provided in a direction perpendicular to the planes of the protrusions of the plurality of spacers, and the protrusions of the plurality of spacers are in contact with each other by the protrusions. 3. The duct connection structure according to claim 2, wherein two electrical conduction paths are formed.   6. The duct connection structure according to claim 5, wherein the projecting portions of the plurality of spacers are penetrated and connected by the first connecting means.   The duct connection structure according to claim 1, wherein the elastic member is disposed on a flange surface side of the adjustment structure.   The duct connection structure according to any one of claims 1 to 7, wherein the flange surfaces of both the ducts and the adjustment structure are penetrated and connected by a second connection means.   The duct connection according to any one of claims 1 to 8, wherein a conductor having a charging part is disposed in the duct in a non-contact state with the duct. Construction.   The duct connection structure according to claim 1, wherein the duct is grounded directly or indirectly.

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