Cylindrical Cutout

Abstract

To provide a technique for firmly fixing mounting hardware on a cylindrical cutout.SOLUTION: A cylindrical cutout is connected to a distribution line and a high-voltage device side wiring. The cylindrical cutout has a body cylinder portion for fixing a mounting bracket. On the surface of the body cylinder, provided are a first regulating portion that protrudes toward the outside of the body cylinder and regulates a vertical movement of the mounting bracket and a second regulating portion that protrudes toward the outside of the body cylinder and regulates the movement of the mounting bracket in the circumferential direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] This specification discloses a technique relating to a cylindrical cutout that is connected to a power distribution line and high-voltage equipment wiring. [Background technology]

[0002] To protect transformers and other equipment, a cylindrical cutout is placed between a distribution line and wiring on the high-voltage equipment side. The cylindrical cutout in Patent Document 1 is fixed to a support member such as a utility pole using a mounting bracket. In Patent Document 1, a flat portion is provided on the outer surface of the cylindrical cutout, and the contact portion of the mounting bracket is brought into contact with the flat portion to fix the cylindrical cutout and the mounting bracket. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Publication number 7-15062 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of Patent Document 1, the force from the mounting bracket is concentrated on a localized portion (flat portion) of the outer surface of the cylindrical cutout. This results in excessive force being applied to the cylindrical cutout, which may result in damage to the cylindrical cutout. Furthermore, if the mounting bracket is fixed to the cylindrical cutout so as not to apply excessive force to the cylindrical cutout, the mounting bracket will move relative to the cylindrical cutout. In other words, the mounting bracket cannot be firmly fixed to the cylindrical cutout. Therefore, there is a need for a technology that can firmly fix the mounting bracket to the cylindrical cutout while preventing excessive force from being applied to the cylindrical cutout. The purpose of this specification is to provide a technology that can firmly fix the mounting bracket to the cylindrical cutout without damaging the cylindrical cutout. [Means for solving the problem]

[0005] The cylindrical cutout disclosed in this specification has a main body tube portion for fixing a mounting bracket, and is provided on the surface of the main body tube portion with a first regulating portion that protrudes toward the outside of the main body tube portion and regulates vertical movement of the mounting bracket, and a second regulating portion that protrudes toward the outside of the main body tube portion and regulates circumferential movement of the mounting bracket. [Brief explanation of the drawings]

[0006] [Figure 1] 1 shows a cross-sectional view of a cylindrical cutout. [Figure 2] FIG. 10 shows a side view of the top cutout body. [Figure 3] 1 shows a partial cross-sectional view of the upper cutout body. [Figure 4] FIG. 1 shows a front view of the upper cutout body. [Figure 5] 1 shows a partial cross-sectional view of a cylindrical cutout. DETAILED DESCRIPTION OF THE INVENTION

[0007] (cylindrical cutout) The cylindrical cutout is connected between a power distribution line and a high-voltage device such as a transformer via an external electric wire. The cylindrical cutout includes a cylindrical cutout body and a fuse barrel (power fuse) disposed within the cylindrical cutout body. The power fuse is connected to an upper electrode and a lower electrode disposed within the cylindrical cutout body. The upper electrode is connected to the power distribution line, and the lower electrode is connected to the wiring on the high-voltage device side.

[0008] (Cylindrical cutout body) The cylindrical cutout body is made of an insulating material (resin). Specifically, the cylindrical cutout body is composed of an upper cutout body made of an insulating material and a lower cutout body made of an insulating material. An example of the insulating material is an ethylene-based resin with added carbon black. An upper electrode is housed in the upper cutout body, and a lower electrode is housed in the lower cutout body. Such a cylindrical cutout body can be made lighter in weight than a conventional cylindrical cutout body that is partially or entirely made of ceramic.

[0009] A cylindrical covering portion may be provided on one of the upper cutout body and the lower cutout body, and a cylindrical insert portion may be provided on the other. For example, if the upper cutout body is provided with a covering portion and the lower cutout body is provided with an insert portion, the upper cutout body and the lower cutout body are fixed together when the insert portion is inserted into the covering portion. That is, the covering portion covers the lower cutout body (insertion portion). A power fuse is disposed in the insertion portion. Furthermore, the covering portion and the insert portion may be fixed together by providing a groove on one of the covering portion and a protrusion on the other, and engaging the groove with the protrusion. This eliminates the need for adhesives, fasteners, etc. for fixing the upper cutout body and the lower cutout body. This reduces the number of parts in the cylindrical cutout and makes it easier to disassemble (sort) the cylindrical cutout when disposing of it.

[0010] When the upper cutout body is provided with a covering portion and the lower cutout body is provided with an insert portion, the upper electrode may be fixed to the upper cutout body while contacting the insert portion. That is, the upper electrode may be sandwiched between the upper cutout body and the insert portion (part of the lower cutout body) and fixed (positioned) within the upper cutout body. This eliminates the need for adhesives, fasteners, etc. for fixing the upper electrode to the upper cutout body. This reduces the number of parts in the cylindrical cutout and makes it easier to disassemble the cylindrical cutout when disposing of it.

[0011] (Top cutout body) The upper cutout body may be provided with an upper umbrella portion for increasing the creepage distance of the outer surface of the cylindrical cutout. This can improve the insulating performance of the cylindrical cutout. Furthermore, a first protrusion protruding radially outward may be provided at a radial end of the upper umbrella portion. In this case, a circumferential portion of the first protrusion may be provided at a higher position than the other portions. Furthermore, another circumferential portion of the first protrusion may be provided at a lower position than the other portions. The first protrusion may be inclined from an upper position to a lower position. In this case, water droplets (rainwater, etc.) adhering to the upper umbrella portion flow over the first protrusion from the upper position to the lower position.

[0012] When the upper cutout body is provided with a covering portion and the lower cutout body is provided with an insertion portion, an insertion hole into which a portion of the upper electrode is inserted may be provided at the upper end of the insertion portion. For example, the upper electrode may have a pair of gripping portions for gripping a power fuse, and the pair of gripping portions may be inserted into the insertion hole. This allows for more reliable positioning of the upper electrode within the cylindrical cutout body. Also, this allows for more reliable engagement between the upper electrode and the upper side electrode of the power fuse disposed within the insertion portion.

[0013] As described above, the upper electrode is connected to the power distribution line. The upper cutout body, the upper electrode, and the lower cutout body can be more firmly fixed together using a fixing member for connecting (fixing) the upper electrode to the power distribution line. Specifically, a connecting portion for connecting the pair of gripping portions is formed in the upper electrode. A through hole (first through hole) is then formed in the connecting portion. A through hole (second through hole) communicating with the outside of the upper cutout body is also formed in the upper cutout body. The second through hole is formed in a position facing the connecting portion (first through hole) of the upper electrode. Furthermore, an upper surface portion for closing a portion of the upper end of the insertion portion is formed in the lower cutout body. A through hole (third through hole) is then formed in the upper surface portion. The third through hole is also formed in a position facing the connecting portion (first through hole) of the upper electrode. A fixing member for connecting the upper electrode to the power distribution line is then passed through the first, second, and third through holes and fixed to the fixed portion of the power distribution line. As a result, the upper cutout body, the upper electrode, and the lower cutout body are fixed by the fixing member.

[0014] When the upper cutout body is provided with a covering portion and the lower cutout body is provided with an insertion portion, a mounting bracket for attaching the cylindrical cutout to another member (such as a utility pole) may be fixed to the covering portion. The covering portion can also be considered a cylindrical main body portion for fixing the mounting bracket. In this case, the surface of the covering portion may be provided with a first restricting portion that protrudes toward the outside of the covering portion and restricts vertical movement of the mounting bracket, and a second restricting portion that protrudes toward the outside of the covering portion and restricts circumferential movement of the mounting bracket. This allows the mounting bracket to be firmly attached to the cylindrical cutout. In other words, the cylindrical cutout can be positioned relative to the mounting bracket.

[0015] The first restricting portion may be provided on at least one of both side surfaces of the cylindrical cutout in a first direction perpendicular to the axis of the cylindrical cutout. The second restricting portion may be provided on at least one of both side surfaces of the cylindrical cutout in a second direction perpendicular to the axis of the cylindrical cutout and the first direction. In other words, the first restricting portion and the second restricting portion may be provided at positions offset by approximately 90 degrees in the circumferential direction of the cylindrical cutout. This makes it possible to avoid overlapping between the portion restricting vertical movement of the cylindrical cutout and the portion restricting circumferential movement of the cylindrical cutout.

[0016] The first restricting portion may be a pair of protrusions spaced apart in the vertical direction of the covering portion. The second restricting portion may also be a pair of protrusions spaced apart in the circumferential direction of the covering portion. In this case, the second restricting portion may be provided on both side surfaces in the second direction, and the spacing between the pair of protrusions on one side surface may be narrower than the spacing between the pair of protrusions on the other side surface. That is, the second restricting portion may be composed of engagement restricting portions provided at two locations on the covering portion (the cylindrical main body portion), and the spacing between the pair of protrusions on one of the engagement restricting portions may be narrower than the spacing between the pair of protrusions on the other engagement restricting portion. Typically, the mounting bracket is attached to the cylindrical cutout by tightening a bolt on the tip side (the side away from the workpiece (such as a utility pole) to which the cylindrical cutout is attached). By providing a second restricting portion with narrow spacing between the protrusions on one side surface, it is possible to ensure sufficient tightening by the bolt. In this case, a pair of protrusions on one side engage with the bent portion of the mounting bracket on the side opposite the workpiece to which the cylindrical cutout is attached, and a pair of protrusions on the other side engage with the bent portion of the mounting bracket on the side of the workpiece to which the cylindrical cutout is attached.

[0017] (Bottom cutout body) The lower cutout body may have a cylindrical portion that houses the lower electrode. The cylindrical portion may have a cylindrical protrusion through which high-voltage equipment wiring connected to the lower electrode passes. The protrusion may extend radially outward from the outer circumferential surface of the cylindrical portion. The radial size of the cylindrical portion may be smaller than the radial size of the upper umbrella portion. This prevents the cylindrical portion from getting wet with rainwater, etc.

[0018] (Lower umbrella part) In addition to the upper cutout body and the lower cutout body, the cutout body may have an umbrella member (lower umbrella portion) attached to the covering portion of the upper cutout body to increase the outer surface length of the cylindrical cutout in the vertical direction. Attaching an umbrella member to the covering portion can further improve the insulating performance of the cylindrical cutout. When the umbrella member is attached to the covering portion, a fixing portion may be provided on the outer surface of the covering portion to fix the umbrella member to the covering portion. Parts (bolts, etc.) for fixing the umbrella member to the covering portion (upper cutout body) can be omitted. When the umbrella portion (upper umbrella portion) is provided on the upper cutout body, the umbrella member may be provided below the upper umbrella portion. In other words, when the umbrella portion () is provided on the upper cutout body, the umbrella portion attached to the upper cutout body can be considered as the lower umbrella portion. Furthermore, a second protrusion protruding radially outward may be provided at the radial end of the lower umbrella portion. [Example]

[0019] (First Example) Referring to FIG. 1, a high-voltage cutout 100 will be described. The high-voltage cutout 100 is installed on a power distribution line and is used to protect equipment such as transformers. The exterior of the high-voltage cutout 100 is mainly composed of a resin upper cutout body 30, a resin lower cutout body 70, and a resin lower umbrella portion 50. The upper cutout body 30, the lower cutout body 70, and the lower umbrella portion 50 are formed of an insulating material containing an ethylene-based material. Specifically, the insulating ethylene-based material is an ethylene-based resin with added carbon black. As will be described in detail later, the upper cutout body 30 and the lower cutout body 70 are fixed together, and the lower umbrella portion 50 is fixed to the upper cutout body 30.

[0020] The high-voltage cutout 100 is installed so that the upper cutout body 30 is on the upper side and the lower cutout body 70 is on the lower side in the direction of gravity. A fuse cylinder 8 and an arc-extinguishing cylinder 6 are arranged inside the high-voltage cutout 100. The fuse cylinder 8 is arranged inside the arc-extinguishing cylinder 6. The fuse cylinder 8 extends in the vertical direction and connects the upper electrode 4 and the lower electrode 12. A fuse 10 is arranged inside the fuse cylinder 8. A conical upper molded cone 3 is fixed to the top of the upper cutout body 30. A lead wire 1 passes through the upper molded cone 3. The lead wire 1 is electrically connected to the upper electrode 4 and is connected to a power distribution line. A lower molded cone 16 is fixed to the side of the lower cutout body 70. A lead wire 18 passes through the lower molded cone 16. The lead wire 18 is electrically connected to the lower electrode 12 via a connection plate 14 and is connected to equipment such as a transformer. Each of the components that make up the high voltage cutout 100 will now be described in detail.

[0021] The upper cutout body 30 will be described with reference to FIG. 2. As shown in FIG. 2, the upper cutout body 30 mainly comprises an upper umbrella portion 32 and a covering portion 36. The covering portion 36 is cylindrical and covers a portion of the lower cutout body 70. The lower cutout body 70 will be described in detail below. A protrusion 31 is provided at the upper end of the upper umbrella portion 32, i.e., the upper end of the upper cutout body 30. The upper umbrella portion 32 widens in diameter from top to bottom, and a first protrusion 34 is provided at the radial end of the lower end (see also FIG. 1). The first protrusion 34 runs around the outer periphery of the upper umbrella portion 32 and has an inclined portion 34c that slopes from the upper portion 34a to the lower portion 34b. The upper portion 34a is located higher than the other portions of the first protrusion 34. The lower portion 34b is located lower than the other portions of the first protrusion 34. As shown in FIG. 1, a protrusion (second protrusion) 54 is also provided at the radial end of the lower end of the lower umbrella portion 50.

[0022] The covering portion 36 is provided below the upper umbrella portion 32. A first restricting portion 36a and second restricting portions 36b and 36c are provided on the outer peripheral surface of the covering portion 36. The first restricting portion 36a and the second restricting portions 36b and 36c all protrude radially outward from the outer peripheral surface of the covering portion 36. The first restricting portion 36a and the second restricting portions 36b and 36c are used to secure a mounting bracket (described later). A fixing portion 38 is fitted into the outer peripheral surface of the covering portion 36 from its lower end. The fixing portion 38 is used to secure the lower umbrella portion 50, which functions as an umbrella member of the high-pressure cutout 100 (see also FIG. 1). The fixing portion 38 is an annular member made of rubber. An annular slit notch is formed in the fixing portion 38. The lower umbrella portion 50 is fixed to the covering portion 36 (upper cutout main body 30) by fitting the upper end of the lower umbrella portion 50 into the slit notch. A pair of grooves 40 is provided at the lower end of the covering portion 36. The pair of grooves 40 are provided at positions symmetrical with respect to the axis of the covering portion 36. Each groove 40 is a T-shaped notch, and is used to fix the lower cutout body 70.

[0023] Next, with reference to Figures 3 to 5, the features of the covering portion 36 of the upper cutout main body 30 (features of the first restricting portion 36a and the second restricting portions 36b, 36c) will be described. The covering portion 36 is provided below the upper umbrella portion 32. The outer peripheral surface of the covering portion 36 is provided with the first restricting portion 36a, the second restricting portion 36b, and the fixing portion 38. The first restricting portion 36a, the second restricting portion 36b, and the fixing portion 38 all protrude radially outward from the outer peripheral surface of the covering portion 36. The first restricting portion 36a and the second restricting portion 36b are used to firmly secure the mounting bracket 90.

[0024] As shown in FIG. 3, first restricting portions 36a are provided at two locations on the circumferential surface of the covering portion 36. The first restricting portions 36a are provided at positions symmetrical with respect to the center of the covering portion 36. That is, the first restricting portions 36a are provided on both sides in a direction (first direction) perpendicular to the axis of the covering portion 36 (the axis of the high-voltage cutout 100). Also, as shown in FIG. 2, in each portion (two locations in the first direction) where the first restricting portions 36a are provided, two first restricting portions 36a are provided spaced apart in the up-down direction of the covering portion 36. The upper and lower first restricting portions 36a restrict vertical movement of the mounting bracket 90 when the mounting bracket 90 is attached to the covering portion 36.

[0025] As shown in FIG. 4, the second restricting portions 36b and 36c are also provided at two locations on the circumferential surface of the covering portion 36. Specifically, the second restricting portions 36b and 36c are provided at positions symmetrical with respect to the center of the covering portion 36. The second restricting portions 36b and 36c are provided in a direction (second direction) perpendicular to the axis of the covering portion 36 (the axis of the high-pressure cutout 100) and the direction in which the first restricting portions 36a and 36a are provided (first direction). As is clear from FIGS. 7 and 8, the two second restricting portions 36b extend in the vertical direction and are spaced apart from each other in the circumferential direction of the covering portion 36. The distance (circumferential distance) between the second restricting portions 36b and 36b is narrower than the distance between the second restricting portions 36c and 36c.

[0026] As shown in FIG. 5 , the mounting bracket 90 has a portion (arc portion) that follows the outer periphery of the sheathed portion 36, and a straight portion at the tip end is fixed with a bolt 91. Typically, the bolt 91 is fastened to the portion (straight portion) that is away from the workpiece to which the high-voltage cutout 100 is attached, such as a utility pole. In the high-voltage cutout 100, the boundary portion (bent portion) between the arc portion and the straight portion at the tip end engages with the second restricting portion 36b, and the boundary portion (bent portion) between the arc portion and the straight portion at the workpiece engages with the second restricting portion 36c. When the mounting bracket 90 is attached to the sheathed portion 36, each bent portion of the mounting bracket 90 engages with the second restricting portion 36b and the second restricting portion 36c, respectively, thereby restricting rotation of the mounting bracket 90 relative to the sheathed portion 36. The second restricting portions 36b and 36c can be considered as engagement restricting portions that engage with the mounting bracket and restrict rotation of the mounting bracket.

[0027] (Other variations) In the above embodiment, the first and second restricting portions 36a, 36b, and 36c are provided on the outer peripheral surface of the covering portion 36 of the upper cutout body 30 to restrict vertical and rotational movement of the mounting bracket 90. The second restricting portion 36c is a protrusion located on the mounting member side and extending in the vertical direction. In addition to or instead of the second restricting portion 36c, a protrusion that directly contacts the mounting member side portion of the mounting bracket 90 may be provided on the outer peripheral surface of the covering portion 36. Alternatively, a flat surface that directly contacts the mounting member side portion of the mounting bracket 90 may be provided on the outer peripheral surface of the covering portion 36. This further restricts rotational movement of the mounting bracket 90.

[0028] In the above embodiment, an example was described in which the first restricting portion 36a has a structure in which two protrusions are provided at two locations in the circumferential direction of the covering portion 36, spaced apart in the up-down direction. That is, an example was described in which the first restricting portion 36a is configured by providing four protrusions on the outer peripheral surface of the covering portion 36. However, the form of the first restricting portion is not limited to the above form. For example, two annular engagement restricting portions (protrusions) may be formed at an interval in the up-down direction on the outer peripheral surface of the covering portion 36. In this case as well, it is possible to restrict the up-down movement of the mounting bracket 90.

[0029] Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. Furthermore, the technical elements described in this specification or drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technology exemplified in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives itself has technical utility. [Explanation of symbols]

[0030] 4:Top electrode 8: Fuse barrel 12: Lower electrode 30: Upper cutout body 32: Upper umbrella part 34:First protrusion 36: Covering part 36a: First Regulatory Section 36b:Second Regulatory Department 70: Lower cutout body 100: Cylindrical cutout

Claims

1. In a cylindrical cutout connected to a distribution line and high-voltage equipment wiring, It has a main body cylindrical portion for fixing the mounting bracket, A cylindrical cutout is provided on the surface of the main body tube portion with a first restricting portion that protrudes toward the outside of the main body tube portion and restricts the vertical movement of the mounting bracket, and a second restricting portion that protrudes toward the outside of the main body tube portion and restricts the circumferential movement of the mounting bracket.

2. The first restricting portion is provided on at least one of both side surfaces in a first direction perpendicular to the axis of the cylindrical cutout, 2. The cylindrical cutout according to claim 1, wherein the second restricting portion is provided on at least one of both side surfaces of the cylindrical cutout in a second direction perpendicular to the axis of the cylindrical cutout and the first direction.

3. The first restricting portion is a pair of protrusions provided at an interval in the up-down direction of the main body cylindrical portion, 3. The cylindrical cutout according to claim 1, wherein the second restricting portion is a pair of protrusions spaced apart from each other in the circumferential direction of the cylindrical main body portion.

4. The second restricting portion is configured by engagement restricting portions provided at two locations on the main body cylindrical portion, 4. The cylindrical cutout according to claim 3, wherein the spacing between the pair of projections on one of the engagement restriction portions is narrower than the spacing between the pair of projections on the other engagement restriction portion.

5. The pair of protrusions of one of the engagement restricting portions engage with the bent portion of the mounting fixture on the opposite side of the cylindrical cutout from the workpiece to which the cylindrical cutout is attached, 5. A cylindrical cutout according to claim 4, wherein the pair of projections of the other engagement restriction portion engage with a bent portion of the mounting fixture on the side of the cylindrical cutout that is attached to the workpiece.

6. The first restricting portion is a pair of protrusions provided at an interval in the up-down direction of the main body cylindrical portion, The second restricting portion is a pair of protrusions spaced apart in the circumferential direction of the main body cylindrical portion, Second restricting portions are provided on both side surfaces in the second direction, 3. The cylindrical cutout according to claim 2, wherein the spacing between the pair of projections provided on one side surface is narrower than the spacing between the pair of projections provided on the other side surface.

7. The cylindrical cutout has an upper electrode therein that connects to both the power distribution line and the fuse barrel, and an upper cutout body that is made of an insulating material; a lower cutout body formed of an insulating material and having a lower electrode therein that is connected to both the high-voltage equipment wiring and the fuse cylinder; 7. The cylindrical cutout according to claim 1, wherein the main body tubular portion is a tubular covering portion provided on the upper cutout body and covering a portion of the lower cutout body.

Images