Snow protection device for overhead lines

Abstract

To provide a snow accretion preventing device for an overhead wire, that is capable of: more surely preventing snow accretion; and being appropriately attached to an existing overhead wire.SOLUTION: A snow accretion preventing device for an overhead wire comprises: two fixing rings 2 fixed to an overhead wire L; rotary rings 3 attached to outer periphery parts of the respective fixing rings 2; and snow-removal blades 4 that are arranged across between the rotary rings 3, rotates as receiving wind and snow, so as to remove snow accreting to the overhead wire L. The fixing ring 2 is constituted of a plurality of division-fixing rings divided into arc shapes, thereby, the fixing rings 2 can be fixed onto the overhead wire L when the division-fixing rings are connected so as to surround the overhead wire L. The rotary ring 3 is constituted of a plurality of division-fixing rings divided into arc shapes, thereby, the rotary ring 3 can be attached onto the fixing ring 2 when arc end portions of the neighboring division-fixing rings interpose each longitudinal end of the snow-removal blades 4 to connect the arc end portions to each other.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a snow accretion prevention device for an overhead wire, which prevents snow from accumulating and accumulating on the overhead wire. [Background technology]

[0002] In overhead transmission lines installed in areas with heavy snowfall, snow that has adhered to the overhead transmission lines falls off, causing a jump (sleet jump) of the overhead transmission lines, which can damage transmission equipment or cause power outages. Furthermore, falling snow that has adhered to the overhead transmission lines can cause damage and obstructions to residential houses and agricultural facilities (e.g., vinyl greenhouses) below.

[0003] For this reason, technologies have been developed to prevent snow from accumulating on overhead power lines, and a snow removal device that can quickly react to wind and remove snow that has accumulated on the overhead power lines is known (see, for example, Patent Document 1). This snow removal device includes a fixed ring fixed to the overhead power lines at a predetermined distance, a rotating ring fitted to the outer circumferential surface of the fixed ring so as to be rotatable in the circumferential direction, a wind vane provided on the rotating ring, and a snow shovel blade connecting the rotating rings. When the wind vane catches wind, the rotating ring and the snow shovel blade rotate, removing snow that has accumulated on the overhead power lines. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-225422 Summary of the Invention [Problem to be solved by the invention]

[0005] However, prevention of snow accumulation is naturally necessary not only for new overhead transmission lines but also for existing overhead transmission lines, and a snow accretion prevention device that can be properly attached to existing overhead transmission lines is desired. However, the snow removal device described in Patent Document 1 only has an annular fixed ring and a rotating ring, and it is unclear how to attach such a fixed ring and a rotating ring to an existing overhead transmission line. In addition, the snow removal device described in Patent Document 1 is designed to receive wind only through the wind vanes provided on the rotating ring, but when the wind speed is low or when snow is attached to the overhead transmission line, there is a risk that the rotating ring and the snow plow blade will not rotate and snow cannot be removed.

[0006] SUMMARY OF THE PRESENT EMBODIMENTS An object of the present invention is to provide a snow accretion prevention device for an overhead wire that can more reliably prevent snow accretion and can be properly attached to an existing overhead wire. [Means for solving the problem]

[0007] In order to solve the above problems, the invention of claim 1 comprises a plurality of fixed rings fixed to an overhead wire, a rotatable ring attached to the outer periphery of each of the fixed rings so as to be rotatable in the circumferential direction, and a snow removal blade in the form of a strip arranged between the opposing rotatable rings and rotating when exposed to snow and wind to remove snow that has adhered to the overhead wire, wherein the fixed ring is made up of a plurality of split fixed rings divided into an arc shape, and the fixed ring can be fixed to the overhead wire by connecting the split fixed rings so as to surround the overhead wire, and the rotatable ring is made up of a plurality of split rotatable rings divided into an arc shape, and the longitudinal ends of the snow removal blades are clamped between the arc ends of adjacent split rotatable rings and the arc ends are connected to each other, thereby making it possible to attach the rotatable ring to the fixed ring. Cage , The arc end portion extends radially outward from the overhead line. This is a snow accretion prevention device for overhead wires.

[0008] The invention of claim 2 is the overhead wire snow accretion prevention device according to claim 1, characterized in that it comprises a plurality of the snow removal blades.

[0009] The invention of claim 3 is characterized in that, in the overhead wire snow accretion prevention device described in claim 1 or 2, the snow removal blade is arranged so as to be spirally wound around the overhead wire. Effect of the Invention

[0010] According to the invention described in claim 1, a band-shaped snow removal blade that receives wind-blown snow is disposed between the opposing rotating rings. In other words, since wind-blown snow can be received over the entire area between the opposing rotating rings, the snow removal blade rotates more reliably, and it becomes possible to more reliably prevent snow from accumulating and accumulating on the overhead wires.

[0011] Furthermore, by connecting the split fixed rings so as to surround the overhead wire, the fixed ring can be fixed to the overhead wire, and by clamping and connecting the ends of the snow removal blades between the arc-shaped ends of the split rotatable rings, the rotatable ring can be attached to the fixed ring and the snow removal blades can be arranged between the rotatable rings. In this way, it is possible to properly attach the snow removal blade to an existing overhead wire.

[0012] According to the invention described in claim 2, since a plurality of snow removal blades are provided and rotate when exposed to wind and snow, it becomes possible to more reliably prevent snow from accumulating and accumulating on the overhead wires.

[0013] According to the invention described in claim 3, the snow removal blade is arranged so as to wrap around the overhead wire in a spiral shape and rotates in a spiral shape, making it possible for the snow removal blade to more effectively and reliably remove snow adhering to the overhead wire. [Brief description of the drawings]

[0014] [Figure 1] 1 is a schematic perspective view showing an installation state of a snow accretion prevention device for an overhead wire according to an embodiment of the present invention; [Diagram 2] 2 is a divided front view showing a fixing ring of the overhead wire snow accretion prevention device of FIG. 1. [Diagram 3]2A is a front view showing the rotating ring and the snow removal blade of the overhead line snow accretion prevention device of FIG. 1 , and FIG. 2B is a front view showing the assembled state. [Figure 4] This is a view from AA in FIG. 3(a). [Diagram 5] FIG. 4 is a cross-sectional view taken along line BB of FIG. [Figure 6] 2 is a diagram showing a state in which one snow removal blade is disposed in the overhead wire snow accretion prevention device of FIG. 1. FIG. [Figure 7] 2 is a diagram showing a snow removal blade of the overhead wire snow accretion prevention device of FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the present invention will be described based on the illustrated embodiment.

[0016] 1 to 7 show an embodiment of the present invention, and Fig. 1 is a schematic perspective view showing an installation state of an overhead line snow accretion prevention device 1 according to this embodiment. This overhead line snow accretion prevention device 1 is a device for preventing snow from accumulating and accumulating on an overhead line, and in this embodiment, the case where the overhead line is an overhead power transmission line L will be mainly described below.

[0017] The overhead line snow accretion prevention device 1 mainly comprises a fixed ring 2, a rotating ring 3, and a snow removal blade 4, each of which is made of an electrical insulating material (for example, resin).

[0018] The fixed ring 2 is a circular ring fixed to the overhead transmission line L, and its inner diameter is set to be slightly smaller than the outer diameter of the overhead transmission line L, so that when it is attached to the overhead transmission line L as described below, it hugs and is firmly fixed to the overhead transmission line L. The outer diameter and axial length of the fixed ring 2 are set so that the rotatable ring 3 described below can be stably mounted and rotated. At least the outer periphery of the fixed ring 2 is provided with or impregnated with a lubricant so that the rotatable ring 3 can rotate smoothly without lubrication. In other words, the fixed ring 2 constitutes an oilless bearing.

[0019] As shown in Fig. 2, such a fixing ring 2 is composed of a plurality of split fixing rings 21, 22 divided into an arc shape. That is, in this embodiment, it is composed of two split semicircular split fixing rings 21, 22, and locking projections 2a are formed on both end faces of the first split fixing ring 21, and locking holes 2b are formed on both end faces of the second split fixing ring 22. The split fixing rings 21, 22 are arranged to surround (embrace) the overhead transmission line L, and the locking projections 2a are inserted into and locked into the locking holes 2b to connect the split fixing rings 21, 22, so that the fixing ring 2 can be attached and fixed to the overhead transmission line L. In this embodiment, two such fixing rings 2 are provided.

[0020] As shown in Fig. 3(b), the rotatable ring 3 is a ring-shaped body that is rotatably attached to the outer periphery of each fixed ring 2 in the circumferential direction. That is, as shown in Fig. 4, the rotatable ring 3 is a ring-shaped body made of a rod material with an inverted concave cross section that is formed into a substantially circular ring shape, and as shown in Fig. 5, the inverted concave portion 3a of the cross section fits into the outer periphery of the fixed ring 2, so that the rotatable ring 3 is rotatably attached to the outer periphery of the fixed ring 2 in the circumferential direction.

[0021] Such a rotatable ring 3 is composed of a plurality of split rotatable rings 31, 32, 33 divided into an arc shape. That is, in this embodiment, as shown in Fig. 3(a), it is composed of three equally divided 120° arc-shaped split rotatable rings 31, 32, 33, each of which is formed to have the same shape, so the first split rotatable ring 31 will be described below.

[0022] Flange portions 3b extending radially outward (away from the center) are formed on both arcuate ends of the first split rotating ring 31. A locking pin 3c is formed on one flange portion 3b, and a locking hole 3d into which the locking pin 3c is locked is formed on the other flange portion 3b. Meanwhile, as described below, pin insertion holes 4c are formed on both longitudinal end portions 4a of the snow removal blade 4.

[0023] 3(b), split rotatable rings 31, 32, 33 are placed on the outer periphery of the fixed ring 2, and each locking pin 3c is inserted into the pin insertion hole 4c of the snow removal blade 4 and then inserted into the adjacent locked hole 3d and locked. As a result, the end 4a of the snow removal blade 4 is clamped between the flange portions (arc-shaped ends) 3b of the adjacent split rotatable rings 31, 32, 33, connecting the adjacent flange portions 3b, i.e., the split rotatable rings 31, 32, 33, and attaching the rotatable ring 3 to the fixed ring 2. In this manner, the rotatable ring 3 is attached to each fixed ring 2.

[0024] The snow removal blade 4 is a band-shaped blade disposed between the opposing rotating rings 3, and is a blade that rotates by receiving wind and snow to remove snow adhering to the overhead transmission line L, and is disposed so as to spirally wind around the overhead transmission line L. That is, as shown in Figs. 6 and 7, it is constituted by a horizontally elongated, substantially rectangular plate, and both ends 4a extend in the radial direction of the rotating ring 3, i.e., the overhead transmission line L, and a twisted portion 4b is formed between the both ends 4a. Here, the twisted portion 4b is formed so that one end 4a is shifted from the other end 4a by 120° around the axis of the overhead transmission line L. Also, as described above, a pin insertion hole 4c for inserting the locking pin 3c of the rotating ring 3 is formed in both ends 4a.

[0025] As described above, both end portions 4a are clamped by the flange portions 3b of the rotating rings 3, and the snow removal blade 4 is disposed between the two rotating rings 3 so as to spirally wind around the overhead power line L. At this time, one end portion 4a is clamped by the flange portions 3b that are shifted by 120° around the axis of the overhead power line L relative to the other end portion 4a.

[0026] The snow removal blade 4 is configured and arranged so that when the snow removal blade 4 is arranged in this manner, it rotates around the overhead power transmission line L due to wind pressure when it hits the snow removal blade 4, or due to snow or rain hitting it and its own weight, thereby removing snow adhering to the overhead power transmission line L (or preventing snow from accumulating thereon). In addition, a gap is provided between the snow removal blade 4 and the overhead power transmission line L so that the overhead power transmission line L is not worn or damaged by contact with the snow removal blade 4.

[0027] In this embodiment, three such snow removal blades 4 are provided, and the three snow removal blades 4 are disposed around the overhead power transmission line L between the opposing rotating rings 3 at intervals of 120°.

[0028] The overhead line snow accretion prevention device 1 having such a configuration is attached to the overhead power transmission line L at desired positions and at desired intervals as described above.

[0029] As described above, according to this overhead line snow accretion prevention device 1, the band-shaped snow removal blades 4 that receive wind-blown snow are disposed between the opposing rotating rings 3. In other words, because wind-blown snow can be received over the entire area between the opposing rotating rings 3, the snow removal blades 4 rotate more reliably, making it possible to more reliably prevent snow from accumulating and accumulating on the overhead power transmission line L.

[0030] Moreover, by connecting the split fixed rings 21, 22 so as to surround the overhead power transmission line L, the fixed ring 2 can be fixed to the overhead power transmission line L. Furthermore, by clamping the end 4a of the snow removal blade 4 between the flange portions 3b of the split rotatable rings 31, 32, 33 and connecting the split rotatable rings 31, 32, 33, the rotatable ring 3 can be attached to the fixed ring 2 and the snow removal blade 4 can be disposed between the two rotatable rings 3. In this way, it is possible to properly attach the snow removal blade 4 to an existing overhead power transmission line L as well.

[0031] Also, since multiple snow removal blades 4 are provided and the multiple snow removal blades 4 rotate when exposed to wind and snow, it becomes possible to more reliably prevent snow from accumulating and accumulating on the overhead power transmission line L. Furthermore, since the snow removal blades 4 are arranged so as to be spirally wound around the overhead power transmission line L and rotate in a spiral shape, it becomes possible for the snow removal blades 4 to more effectively and reliably remove snow adhering to the overhead power transmission line L.

[0032] Although the embodiment of the present invention has been described above in detail, the specific configuration is not limited to this embodiment, and the present invention includes design changes and the like that do not deviate from the gist of the present invention. For example, in the above embodiment, the snow removal blade 4 is disposed between two opposing rotating rings 3, but three or more fixed rings 2 and rotating rings 3 may be disposed, and the snow removal blade 4 may be disposed between each rotating ring 3. In addition, the fixed ring 2 is composed of two separate split fixed rings 21, 22, but the split fixed rings 21, 22 may be connected at one end so as to be freely opened and closed, and configured as an integrated unit.

[0033] Furthermore, a stopper may be provided on the fixing ring 2 so that the entire overhead line snow accretion prevention device 1 can be moved over the overhead transmission line L with the stopper removed. This allows the overhead line snow accretion prevention device 1 to be assembled to the overhead transmission line L, for example, around a tower where the working environment is relatively good. Then, after the overhead line snow accretion prevention device 1 has been moved to a desired position, the stopper is stopped to fix the overhead line snow accretion prevention device 1, making it possible to assemble and install the overhead transmission line L more stably and safely. Although the overhead line has been described as being the overhead transmission line L, it may be another overhead line, and for example, the overhead line snow accretion prevention device 1 can also be applied to a power distribution line, a communication line, and the like. [Explanation of symbols]

[0034] 1 Snow accumulation prevention device for overhead lines 2 Retaining ring 21 First split retaining ring 22 Second split retaining ring 3 Rotating Ring 3a Reverse recess 3b Flange part (arc end) 3c Locking pin 3d locked hole 31, 32, 33 split rotating ring 4 Snow removal blade 4a end 4b Twisted part 4c Pin insertion hole L Overhead power transmission line (overhead line)

Claims

1. a plurality of fixing rings fixed to the overhead line; a rotating ring attached to the outer periphery of each of the fixed rings so as to be rotatable in a circumferential direction; a snow removal blade that is strip-shaped and disposed between the opposing rotating rings, and that rotates when exposed to wind and snow to remove snow that has adhered to the overhead wire; The fixing ring is composed of a plurality of split fixing rings divided into an arc shape, and the fixing ring can be fixed to the overhead wire by connecting the split fixing rings so as to surround the overhead wire, the rotating ring is composed of a plurality of divided rotating rings divided into arc shapes, and the rotating ring can be attached to the fixed ring by clamping the longitudinal end of the snow removal blade between the arc ends of adjacent divided rotating rings and connecting the arc ends to each other; The arc end portion extends radially outward from the overhead line. A snow accretion prevention device for overhead wires.

2. A plurality of said snow removal blades are provided.

2. The snow accretion prevention device for an overhead wire according to claim 1.

3. The snow removal blade is arranged so as to be spirally wound around the overhead wire.

3. The snow accretion prevention device for an overhead wire according to claim 1 or 2.

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