JP6402463B2 - Lightning strike conduction structure on telescopic mast - Google Patents

Description

  The present invention relates to a lightning strike conduction structure in a telescopic mast. More particularly, the present invention relates to a lightning strike conduction structure in a telescopic mast that can secure a current-carrying path during a lightning strike in a ship using a telescopic hard sail, a mast of wind power generation, a crane boom, or the like.

  In order to achieve significant CO2 reduction in shipping, a new type of wind-driven propulsion ship with a sail craft has been developed that aims to halve the amount of fuel oil used compared to a conventional aircraft with the same performance. This new type of wind-powered propulsion ship uses a telescopic hard sail having a large area and high lift (see Patent Documents 1 and 2).

  The telescopic hard sails disclosed in Patent Documents 1 and 2, etc. are those in which a multi-stage unit mast is configured so that it can be expanded and contracted by a hydraulic cylinder or the like, and a mast of the same number of stages is attached to each unit mast. is there. According to the mast having this structure, a plurality of hard sails can be expanded and contracted up and down to receive a large wind force or to avoid a storm.

On the other hand, a ship navigating at sea needs a safety measure to escape a large current during a lightning strike.
However, each mast stage is supported by a non-electrically conductive but low-friction sliding member such as a synthetic resin in order to reduce sliding friction during expansion and contraction.
For this reason, when lightning strikes a lightning rod attached to the top of the uppermost hard sail, the sliding member cuts off the power supply, which may damage the hydraulic equipment and electronic equipment inside the mast.

  Patent Document 3 has a structure in which a lightning rod is attached to an expansion / contraction pole having a structure similar to that of an expansion / contraction hard sail. In this prior art, energization is ensured by contacting the members only at the time of maximum extension, and it is not possible to ensure energization in a state other than at the time of maximum extension. Therefore, it is extremely insufficient for preventing damage during lightning strikes.

Japanese Patent No. 5137628 Japanese Patent No. 5318008 Utility Model Registration No. 2604356

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lightning strike conduction structure in an expansion / contraction mast that can ensure energization regardless of the expansion / contraction length of the mast.

The lightning strike conduction structure in the telescopic mast of the first invention comprises a telescopic mast in which a plurality of unit masts are telescopically attached, and a lightning rod attached to the upper end of the telescopic mast. The upper-stage unit mast is held by a slide plate made of non-conducting material attached to the inner peripheral wall of the lower-stage unit mast, and there is a conduction device that contacts the current-carrying member between the outer peripheral surfaces of the unit mast of each stage. The conductive device is attached to a conductive slider inserted into a recess formed in the slide plate of the lower unit mast, and the outer periphery of the upper unit mast body. It consists of a spring that presses and urges the member .
A lightning strike conduction structure in a telescopic mast according to a second aspect of the present invention is the first invention, wherein each unit mast has a quadrangular cross section, and the conduction device is attached to at least two opposing faces of the four outer faces. It is characterized by that.
Lightning when conductive structures in telescoping mast of the third invention, was first or the second invention, the telescoping mast, marine telescoping hard consisting hard sail plurality of stages of expanding and contracting in the vertical direction above the space on the ship It is a mast that supports the sail.

According to the first invention, the following effects are obtained.
a) By securing an energization path with an energizer during a lightning strike, damage to hydraulic equipment and electronic equipment inside the mast can be avoided. In addition to lightning strikes, current generated by radio waves can flow to the ground on the ground plane, so that no current flows to various electronic devices and the like, so that malfunctions of various electronic devices can be avoided, and an energization path can be secured reliably.
b) Since the slider is pressed by the spring, even when the gap between the unit masts changes, the contact can be maintained and the energization path can be ensured reliably.
According to the second invention, even if the mast body is deflected by an external force such as wind and the gap between the unit masts becomes large, it can be energized by any one of the two opposing conductive bodies. An energization path can be secured.
According to the third aspect of the present invention, even if a ship equipped with a telescopic hard sail is under lightning while sailing on the sea, damage to hydraulic equipment and electronic equipment inside the mast is ensured by securing a current-carrying path with the current-carrying body during lightning. Can be avoided.

It is sectional drawing of the conduction structure at the time of a lightning strike in the expansion-contraction mast which concerns on one Embodiment of this invention. It is explanatory drawing of the conduction | electrical_connection apparatus 10 which concerns on one Embodiment. It is explanatory drawing of the conduction | electrical_connection apparatus 20 which concerns on other embodiment. (A) is a side view of a hard sailing ship, (B) is a top view. (A) is a perspective view of an expansion-contraction mast, (B) is a perspective view of an expansion-contraction hard sail.

Next, an embodiment of the present invention will be described with reference to the drawings.
First, an embodiment in which the present invention is applied to a stretchable hard sail for ships will be described.
FIG. 4 shows a wind-powered propulsion ship S using the telescopic hard sail ES. The wind-powered propulsion ship S is a ship of a type in which a telescopic hard sail ES having a large area and high lift is erected on the ship. The number of expansion / contraction hard sails ES is arbitrary, and may be one or more.
In the illustrated example, four units are used, but there are also about ten units.

The basic structure of the telescopic hard sail ES will be described with reference to FIG.
(A) The telescopic mast M shown in the figure is a five-stage mast using unit masts 1, 2, 3, 4 and 5, which can be expanded and contracted by a built-in hydraulic cylinder or the like and can be swung freely by a hydraulic motor or the like provided at the base. It has become.
(B) As shown in the drawing, the hard sail Sa is composed of five-stage unit sails 11, 12, 13, 14, and 15, which are attached to the unit masts 1, 2, 3, 4, and 5, respectively. Each unit sail 11 to 15 is a rigid sail using light weight and high rigidity aluminum, GFRP (glass fiber reinforced plastic), CFRP (carbon fiber reinforced plastic) and the like. The cross-sectional shape is typically a crescent shape or a wing shape similar to an airplane wing, but there is no particular limitation.

As shown in FIG. 4, the telescopic hard sail ES having the structure as described above can be changed in height by extending and contracting in the vertical direction, and the direction of the wing can also be changed by turning.
A lightning rod 7 is attached to the upper end of the telescopic hard sail ES to cope with a lightning strike during voyage or anchorage.
The lightning rod 7 may be attached to the upper end of the telescopic mast M, or may be attached to the upper end of the hard sail Sa. When the lightning rod 7 is attached to the hard sail Sa, a conducting wire may be disposed between the lightning rod 7 and the telescopic mast M.

A lightning strike conduction device according to an embodiment of the present invention will be described with reference to FIGS.
The extendable mast M in FIG. 1 is composed of unit masts 1 to 3 in three stages, and a lightning rod 7 is attached to the upper end of the extendable mast M.
A synthetic resin slide plate 6 is mounted between adjacent unit masts, that is, between the lower unit mast 1 (or 2) and the upper unit mast 2 (or 3).
More specifically, the slide plate 6 is attached to the inner periphery of the upper end of the unit mast 1 on the lower stage side, and the slide plate 6 is also attached to the outer periphery of the lower end part of the unit mast 2 on the upper stage side. For the uppermost unit mast 3, a slide plate 6 is attached to the inner periphery of the upper end of the lower unit mast 2, and the slide plate 6 is also attached to the outer periphery of the lower end of the upper unit mast 3. ing.

As shown in FIG. 1, the conduction device 10 is attached between adjacent unit masts.
Specifically, the conduction device 10 attached to the upper end of the lower unit mast 1 secures conduction between the upper unit mast 2 and the lower unit mast 2 is connected to the upper unit mast 3. The conduction device 10 attached to the upper end ensures electrical conductivity for the upper unit mast 3.

The details of the conduction device 10 will be described with reference to FIG.
In the figure, reference numeral 6 denotes the slide plate described above, which is attached to the inner periphery of the upper end of the lower unit masts 1 and 2 (which are the lower units for the upper unit masts 2 and 3 respectively). Each unit mast 1, 2, 3 is made of a conductive material such as a steel material, and an arbitrary shape such as a polygonal shape, a circular shape, or a round shape is used for the cross-sectional shape in addition to a square shape.
The conduction device 10 is attached to the upper ends of the lower unit masts 1 and 2.

  The conduction device 10 includes a leaf spring 11, a slider 12, and a mounting bracket 13. The leaf spring 11 includes a base portion 11a and an inverted J-shaped curved portion 11b. The leaf spring 11 is a conductive spring material having elasticity, and corresponds to a current-carrying body referred to in the claims.

The leaf spring 11 has a conductive slider 12 attached to the distal end portion thereof, and a base end portion is fixed to the upper end portions of the lower masts 1 and 2 by bolting or the like via an attachment fitting 13. Yes.
In such an attached state, the leaf spring 11 presses the slider 12 against the outer surfaces of the upper masts 2 and 3 by its elasticity. In other words, the leaf spring 11 is bent so as to press and bias the slider 12. Therefore, even if the gap between the unit masts changes, the energization path can be secured by the urging force of the leaf spring 11.

  The conduction | electrical_connection apparatus 10 shown in FIG. 2 is attached to the outer surface which consists of four surfaces of the square cross section in the unit mast 1-3. For this reason, even if the gap between unit masts changes so as to be different between the four surfaces, it is possible to secure an energization path using any one of the four conduction devices 10. In addition, it is not necessary to attach the conduction | electrical_connection apparatus 10 to all four surfaces, The thing attached to only one surface or two surfaces is also contained in this invention.

  According to the present embodiment, by securing the energization path by the leaf spring 11 of the conduction device 10, it is possible to avoid damage to hydraulic equipment and electronic equipment inside the mast due to lightning strikes. In addition to lightning strikes, current generated by radio waves can flow to the ground of the ground plane, so that no current flows to various electronic devices and the like, and malfunctions of various electronic devices can be avoided.

(Other embodiments)
3 includes a conductive slider 22 inserted into a recess 21 formed in the slide plate 6 of the lower unit mast, and the upper unit mast body of the slider 22. And a spring 23 that presses and urges the outer peripheral member.
According to the present embodiment, since the slider 22 is pressed by the spring 23, even if the gap between the unit masts changes, the contact can be maintained and conducted.

  The conduction device 10 shown in FIG. 2 and the conduction device 20 shown in FIG. 3 were attached to the upper end of the lower unit mast, but this was attached to the lower end of the upper unit mast and the outer member of the lower mast. It is also possible to take a configuration that contacts the inside from the inside, and such an embodiment is also included in the present invention.

  The lightning strike conduction structure of the present invention can be applied to any structure as long as it has a telescopic mast and is provided with a lightning rod at its upper end, as well as a telescopic hard sail for ships. Examples of such a structure include a mast for wind power generation and a crane boom.

1, 2, 3 Unit mast 6 Slide plate 7 Lightning rod 10 Conducting device 11 Leaf spring 12 Slider 13 Mounting bracket 20 Conducting device M Telescopic mast

Claims (3)

A telescopic mast in which a plurality of unit masts are telescopically attached, and a lightning rod attached to the upper end of the telescopic mast,
The unit mast of each stage is held by a slide plate made of non-conducting material attached to the inner peripheral wall of the lower unit mast,
Between the outer peripheral surfaces of the unit mast of each stage, a conduction device that contacts the current-carrying body is attached ,
The conduction device includes a conductive slider inserted in a recess formed in the slide plate of the lower unit mast,
A lightning strike conduction structure in a telescopic mast characterized by comprising a spring that presses and urges the slider against the outer peripheral member of the upper unit mast body . Each of the unit mast is a cross-sectional square, lightning when conductive structures in telescoping mast of claim 1, wherein said conducting device to the at least two opposite surfaces of the outer surfaces of the four sides are attached. The telescoping mast, telescoping mast of claim 1 or 2, wherein it is a mast to support the marine telescoping hard sail consisting of hard sail plurality of stages of expanding and contracting in the vertical direction above the space on the ship Lightning strike conduction structure in