JPH0471993A - Water suction introducing device for jet propulsion type gliding boat - Google Patents

Abstract

PURPOSE:To improve clearance effect for floating obstacle and prevention effect for side slip of a boat body by forming a scope-gate for removing of floating obstacle provided at a water suction port of the bottom of boat, into a slender lattice like one body provided with a pair of front and rear fitting parts and a pair of right and left flow regulating standing walls, out of synthetic resin. CONSTITUTION:This scope-gate C fitted to the suction port 18 opened on the center part of the bottom of the body A of a jet propulsion small sized gliding boat, is injection-molded in one body which is formed into a slender lattice-like form and out of transparent synthetic material having high bending elastic modulus. Further, the scope-gate C is constituted out of a pair of front and rear fitting seats 21, 22 having a decided width (w) narrower than the opening width (s) of the suction port 18 and a pair of right and left parallel regulating flow standing walls 27, 28 bridged mutual fitting seats 21, 22. At turning of the body A, relatively acting pressing force of water is received with the standing side faces of the walls 27, 28, by bendingly deforming of them in the right and left direction, water is not dammed up and smoothly sucked in.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a water absorption guiding device for a jet propulsion watercraft.

<Prior art> Generally, in a small jet-propelled personal watercraft on which one person stands or several people sit, water is sucked in through a water intake port opened at the bottom of the boat body, and the water is installed in a water intake duct. It is accelerated by the impeller that is attached to the boat, and is strongly pumped towards the rear of the boat.
The water jet is used to generate a jet, and the reaction force is used to propel the boat, but not only water but also garbage, seaweed, fishing lines, and other floating obstacles are sucked in from the water intake. For this reason, a special grid called a scope gate or grate is attached to the water intake in order to eliminate obstacles.

<Problems to be Solved by the Invention> The conventional scope gate of this type consists of a pair of front and rear mounting seats (1) (2) and a pair of left and right side bars (3) (4), as shown in Figure 1O111. It has an elongated lattice shape in the front and back direction, and inside it there are one or several partition rods (
5) are interposed in parallel with both side bars (3) and (4), but in any case, they are usually cast from an aluminum alloy or other metal material.

The cross-sectional shapes of the side rods (3) (4) and the partition rod (5) are circular in both figures, but there are also elliptical and rectangular shapes elongated in the vertical direction.

Then, the above-mentioned both side bars (3) (4) and partition # (
5) extends parallel to the center line of the boat, and has high rigidity as a metal product, so it has excellent straight-line stability of the boat, and if the number of partition rods (5) is increased, The larger the number, the more effectively the floating obstacles can be eliminated.

However, this advantage does not apply when the boat turns.
It will be exposed as a defect.

In other words, the so-called edge effect (anti-skid effect) of the boat body due to the side bars (3) (4) and the partition bar (5) becomes too strong due to the high rigidity of the metal products, and the boat This creates a large amount of resistance to the turning action of the boat, making it difficult to steer it smoothly, and on top of that, the amount of water absorbed from the water intake port of the boat to the water intake duct decreases, and the water flow becomes turbulent, like foaming. As a result, cavitation occurs within the water absorption duct, leading to loss of propulsion energy and corrosion of the impeller. This problem becomes more pronounced as the number of partition rods (5) increases.

Further, since the conventional scope gate is entirely made of metal, it becomes an obstacle when looking through the inside of the water intake duct from the water intake port. In other words, if, for example, a floating obstacle enters the water absorption duct and becomes entangled with the impeller or its propulsion shaft, the bottom of the boat must be tipped upwards.
It is not possible to easily inspect the inside of the water absorption duct.

And it is clear that this also becomes more powerful as the number of partition rods (5) increases.

<Means for Solving the Problems> The present invention is intended to solve such problems, and for this purpose, a scope gate for eliminating floating obstacles is attached to the water intake opening at the bottom of the boat body, and , A jet propulsion type watercraft that uses an impeller inside the water intake duct to accelerate the water sucked in through the water intake duct and jets it toward the rear of the boat. and a pair of left and right straightening standing walls, which are integrally molded into a long and narrow lattice shape in the front and rear direction, and the straightening standing walls are set so that they can naturally flex and deform in the left and right direction like a leaf spring when the boat turns. The main feature is that

<Operation> According to the above configuration of the present invention, since both rectifying uprights of the scope gate extend parallel to the center line of the boat,
Not only does it provide the same straight-line stability of the boat as with conventional products, but when the boat turns, both rectifying uprights automatically flex and deform along the left and right directions like leaf springs, preventing the boat from skidding. While achieving the prevention effect, it does not disturb the water flow from the water intake port to the water intake duct, and it does not reduce the water gate, making it possible to achieve an extremely smooth suction action. If you become the pilot of one, you can experience it for yourself.

In addition, since the scope gate as a whole is made of a transparent or semi-transparent synthetic resin material, even if the inside of the grid is subdivided by separate partitions and straightening walls, thereby improving the effect of removing floating obstacles, the The inside of the water suction duct can be inspected very easily from the water intake port of the boat body to which the scope gate is attached, and there is no need to turn the boat body upside down on the bottom surface.

<Example> Hereinafter, the specific structure of the present invention will be described in detail based on the illustrated example. In FIG. It is a general term for a boat body made of materials such as FRP (FRP) with an overall hollow and sealed float structure, and the front part is divided into an engine room (10).
Similarly, the top surface at the rear is formed as a floor deck (11) for the operator to stand on. However, a seat for the operator to sit on may be provided in the center of the floor deck (11).

(12) is an engine built in the engine room (lO), which drives the jet propulsion device (water jet pump) (B) via the propulsion shaft (13), and propels the boat (A). Propulsive force is now provided.

In other words, the propulsion shaft (13) extends below the floor deck (11) along the center line of the boat (A), and its front end is connected to the clutch (14). It is connected and integrated with the crankshaft (not shown) of the engine (12), while an impeller (15) and a guide vane (16) are also attached to the rear end of the propulsion shaft (13) so that they can rotate together. It is being

(17) is a water suction duct which serves as a pump case for receiving the impeller (15) and guide vane (16), and is recessed below the floor deck (11) and has a water suction port on the front side. (18) is opened at the center of the bottom of the boat (A).

When the propulsion shaft (13) is rotationally driven, the impeller (15) automatically sucks water from the water intake port (18), and the water is transferred to the water intake duct (17).
Inside, the steering nozzle (19) is accelerated and forced rearward by an impeller (15), rectified by a guide vane (16), and opens at the rear of the boat (A).
The reaction force of the ejection action causes the boat (A) to move forward.

Place the steering nozzle (19) on the floor deck (1
1) Needless to say, the boat (A) can be steered by manually controlling it remotely from above and swinging it left and right.It should be noted that (20) is attached to the center of the bottom of the boat (A). Showing the pump case cover.

Since there is a risk that garbage, seaweed, fishing line, and various other floating obstacles may be sucked in from the water intake port (18) along with water, a scope gate (C) for removing them is installed as shown in Figure 2.3. As if to partition the water intake (18), the hull (A
), but in the present invention, the scope gate (C) is made of polycarbonate resin (preferably manufactured by Idemitsu Petrochemical Co., Ltd.) having a particularly high bending modulus (preferably about 23,000 kg/- or more). It is integrally injection-molded from Taflon (trade name), polyacetal resin, and other engineering plastic materials into a lattice shape elongated in the front and back direction as shown in Figures 4 to 6, and the entire body also has transparency. ing.

In other words, the fourth image that extracts and shows the scope gate (C)
In Figures 6 to 6, (21) and (22) are the water inlets (1
8) A pair of front and rear mounting seats with a constant width (W) narrower than the opening width (S) of 8), and a pair of bolt holders are provided with holes (23) at both left and right ends of the front mounting seat (21). On the other hand, in the center of the rear mounting seat (22), a bolt receiving hole (24) is also formed, preferably in the form of an elongated opening in the front-rear direction. There is. However, the bolt receiver is a hole (23) (24
) can be freely changed depending on the relationship with the hull (A).

Each of the front and rear pairs of the mounting seats (21) and (22) is connected to the bottom surface of the hull (A) on its horizontal mounting surface, and a plurality of The scope gate (C) itself is fixedly attached via the stud bolts (25) and (26) so that it can be detached and replaced.

Scope gate on both mounting seats (21) C22)
The opening edges facing into the lattice in (C) are each formed as a rising slope surface (21a) (22a) at a certain angle, thus forming the water intake port (18) of the hull (A). (17) The water can be sucked smoothly into the water absorption duct (17) without disturbing the water.

(27) and (28) are a pair of parallel straightening walls on the left and right that bridge between the mounting seats (21) and (22), and partition the water intake port (18) of the hull (A). It extends long along the front-back direction of the boat body (A), and its side surfaces are all erected in a relationship substantially perpendicular to the mounting surfaces of the mounting seats (21) and (22).

Therefore, in conjunction with the fact that the scope gate (C) itself is made of the above-mentioned synthetic resin material, when the boat body (A) turns, the pressure force of the water that acts relative to it is reduced by the rectifying vertical wall (27
>(28), which bends and deforms in the left-right direction as shown in FIG. 7, as if it were a plate spring. Due to the bending and deformation of the straightening walls (27-) (28), the water is allowed to escape without being blocked or disturbed, and the water is smoothly sucked from the water intake port (18) of the hull (A). This means that it is becoming more and more important.

In addition, when the boat (A) is moving straight without applying pressure force of water from the lateral direction to the upright side surface, the rectifying vertical wall (2
7) It goes without saying that (28) is in a restored state by itself.

Moreover, the cross-sectional shape of the straightening vertical walls (27) (28) is a pair of bilaterally symmetrical walls, and the top surface is gradually thinner than the bottom surface, as shown in FIGS. 6(1) to (I[I). It is formed into a basic triangle or trapezoid. In other words, the upright side surfaces of the straightening walls (27) (28) are tapered upwardly at a certain angle (27a) (27b) (28a).
(28b).

Therefore, the water can be drawn into the water inlet (18) very smoothly so as to be guided onto the center line of the boat (A), and the attitude of the boat (A) is not tilted when turning. In addition, the rectifying walls (27) and (28) of the scope gate (C) are also tilted, and the standing side faces thereof are perpendicular to the water surface. damming and disturbances are suppressed, and the hull (A)
Substantially the same amount of water as when traveling straight can be smoothly sucked into the water suction duct (17) from the water suction port (18).

In this sense, the cross-sectional shape of the rectifying chamber g (27) (28) is determined to be an isosceles trapezoid as shown in Figure 6 (1) (n), or a chicken egg shape or a water drop shape corresponding to its deformation. is the most effective, but as mentioned above, both rectifying and standing xl (
27) As long as the cross-sectional shape shown in (28) is symmetrical, it may be formed into a non-isosceles trapezoid or a right triangle as shown in (III) of the same figure.

Furthermore, when the rectification chambers q (27) and (28) are viewed from the lateral direction of the hull (A), as is clear from Figures 3 to 5, the top surface thereof forms a uniform horizontal surface as a whole. Contrary to this, the bottom surface is formed into a 7-shaped shape that gradually protrudes downward toward approximately the middle in the front-rear direction.

In other words, almost the front half of the straightening wall (27) (28) is continuous with the bottom of the front mounting seat (21) as the front curved inclined slope surface (27c) (28c) of the bottom surface, and the remaining half The bottom of the section is reversed and the slope slopes upward from the rear (27
d) As (28d), it is also continuous with the bottom surface of the rear mounting seat (22) in a flush state, so both inclined slope surfaces (27c) (28c) (27d) (28d)
The part where the two intersect, roughly in the middle, protrudes downward the most. (θ) indicates the intersection angle.

Therefore, the scope gate (C) itself is synthesized with the above ma#
The rectifying chamber M (27) (28) is made by integrally molding the material.
The middle part of the rectifying wall (27) (28) that is farthest from both mounting seats (21) (22) is designed so that it can cause a bending deformation effect when turning. It will be possible to strengthen it. In addition, the rectifier room q (
27) As mentioned above, the front half of (28) is set as the front curved slope surface (27c) (28c) of the bottom surface, so the water acting here causes the hull (A
) can also provide lift.

Figure 8.9 is a scope game corresponding to Figures 4 to 6) (C
), in which both straightening walls (2
7) Another partition rectifying standing wall (29) is arranged in parallel between the left and right sides of (28), which further improves the effect of removing floating obstacles. Regarding the cross-sectional shape, the above-mentioned both straightening walls (2
7) Due to the positional relationship between the left and right sides of (28), it is determined to be an isosceles trapezoid or an isosceles triangle as shown in FIG. 9, or a water drop shape that corresponds to a modification thereof. In addition, partition rectifying standing wall (
The number of straightening walls (27) and (28) may be increased to two or more as long as they extend parallel to both straightening walls (27) and (28).

In any case, when attaching the scope gate (C) to the bottom of the boat (A), the entire scope gate (C) should be attached to the boat as long as the water intake port (18) is partitioned off. It may be installed so that it does not protrude downward from the bottom of the body (A), but as shown in Figure 3, the rear position from the middle of the straightening walls (27) (28) should be It is effective to mount it so that it extends downward and exposed by a certain amount (h) from the bottom surface of (A).

By doing so, the water intake port (18
) A rectifying standing wall (27) that projects downward from the bottom of the hull (A), where floating obstacles attempting to attach to the rear end of the opening of the hull (A)
(28) will be used to guide the flow to the rear, and when the boat (A) turns, the straightening vertical wall (28) will be guided to the rear.
7) This is because the rear half of (28) also functions to prevent skidding of the boat (A). However, since the rectifying walls (27) and (28) themselves are deflected and deformed in the left-right direction as described above, there is no risk that the sideslip prevention effect will be too strong.

As mentioned above, the scope gate (C) as a whole is molded from a transparent or semi-transparent synthetic resin material, but in addition to its transparency, it may also be coated with an appropriate fluorescent color. It is possible.

<Effects of the Invention> As described above, in the present invention, the scope gate (C) for removing floating obstacles is attached to the water intake port (18) which opens on the bottom of the boat (A), and the water intake port ( The water sucked in from the impeller (15) in the water absorption duct (17)
) in a jet-propelled personal watercraft that is accelerated by a jet propeller (A) and jets water to the rear of the hull (A), a pair of front and rear mounting seats (21) and (22) are made of a synthetic resin material that allows the scope gate (C) to be seen through. Left and right - paired rectifier chambers! ! ! (27) and (28) are integrally molded into an elongated lattice shape in the front and rear direction, and the straightening vertical walls (27) and (28) are made to move in the left and right direction like a leaf spring when the boat body (A) turns. Since it is set so that it can be bent and deformed, it has the effect of reliably improving the problem of the prior art mentioned at the beginning.

That is, the scope gate (C) of the present invention is integrally molded in a lattice shape from a synthetic resin material, and is connected to the water intake port (A) of the boat body (A).
A pair of left and right straightening standing walls (27) (28) extending along the front and back direction as if partitioning the I8) are capable of bending and deforming in the left and right direction when the boat body (A) turns. Therefore, from the water intake port (18) to the water intake duct (1
7), without blocking or disturbing the water flow, or even reducing the amount of water, the suction action can be carried out extremely smoothly, and there is no risk of cavitation phenomenon occurring within the water absorption duct (17). do not have.

In addition, since the entire scope gate (C) is provided with see-through performance, the water intake port (]8) does not need to be turned over to the bottom of the boat (A) to which it is attached.
It is possible to see through the inside of the water absorption duct (17) at a glance.
Due to the insertion of item 9), even if the inside of the grid is subdivided, there is no risk of it being lost, and the workability of the above-mentioned inspection is excellent.

In particular, if the configuration of claim 2 is adopted, when the boat (A) is moving straight, from above the center line of the boat (A) to the inside of the water intake port (18),
Water can be sucked in very smoothly and correctly, and when the boat body (A) tilts when turning, the rectifying wall (2
7) (28) Tapered slope surface (27a) (27
b) Since (28a) and (28b) change to a state in which they are perpendicular to the water surface, this, combined with the bending and deformation described above, causes substantially the same amount of water as when traveling straight,
The rectifying wall (27) (28) can be used to dam the water,
Alternatively, there is an effect that the water can be sucked into the water intake port (18) while rectifying the water even more smoothly without fear of disturbance.

If the configuration according to claim 3 is adopted, the scope gate (
C) As a synthetic resin product, its rectification chamber q (27
) (28) is designed to be able to bend and deform, but approximately the middle part of the straightening wall (27) (28) that is farthest from the pair of front and rear mounting seats (21) (22) is physically fixed without fear of breakage. This means that it can be strengthened and its durability can also be improved.

Also, l! of claim 4! If a structure is adopted, while the above-mentioned flexural deformation effect when the boat body (A) turns, the scope gate (C
) can be subdivided, which has the effect of reliably preventing floating harmful substances from entering the water inlet (18).

If the configuration according to claim 5 is adopted, both mounting seats (2
1) (22) Rear rising fIJi slope surface (2] a)
(22a) LThus, water can be smoothly introduced into the water intake port (18) with even less resistance. Furthermore, if the configuration of claim 6 is adopted, the scope gate (C) has a hull (
A) A palanquin M on the appearance that blends in with A)! It can be said to be of great practical benefit in the sense that it can make a difference, and it will make it easier to search for an accident that makes it impossible to ski if an accident occurs off the coast of Mankai.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view schematically showing the entire jet-propelled personal watercraft according to the present invention, FIG. 2 is a bottom view showing an enlarged rear part thereof, and FIG. 3 is a sectional view taken along the line 3-3 in FIG. 2. Figure 4 is a slope view showing the extracted scope gate, and Figure 5 is the 5th section of Figure 4.
-5 line sectional view, Figure 6 (1) is also an enlarged sectional view along line 6-6 in Figure 4, gA6 figure (II) (m) shows various modifications corresponding to the same figure (1). 7 is an explanatory diagram showing the deformation effect of the straightening wall in the scope gate, FIG. 8 is a perspective view showing a modified example of the scope gate corresponding to FIG. 4, and FIG. 10 is a perspective view showing a conventional scope gate, and FIG. 11 is an enlarged sectional view taken along line 11-11 of FIG. 10. (12) ・ ・ ・ (13) ・ ・ ・ (15) ・ ・ ・ (]7) ・ ・ ・ (18) ・ ・ ・ (21) (22) ・ (A) ・ ・ ・ ・ (B) ・ ・・ ・ (C”) ・ ・ ・ ・ Engine propulsion shaft Impeller Water intake duct Water intake port Mounting seat Rectifier standing wall Hull Jet propulsion device Scope gate Figure 6 (I) Figure 6 (H) ?T ~ 9 To\1

Claims (1)

[Claims] 1. A scope gate (C) for removing floating obstacles is attached to the water intake port (18) opened at the bottom of the boat (A), and the water taken in from the water intake port (18) is Water absorption duct (17
) is accelerated by the impeller (15) in the hull (A).
A pair of front and rear mounting seats (21) (22) and a pair of right and left straightening walls (27) (28) are made of a synthetic resin material that allows the scope gate (C) to be seen through. The straightening walls (27) and (28) are integrally molded into a lattice shape elongated in the front and rear direction with A water absorption guidance device for a jet propulsion type planing boat, characterized in that it is set to. 2. A claim characterized in that the cross-sectional shape of the straightening vertical walls (27) and (28) is formed into a basic triangular or trapezoidal shape that is symmetrical and whose top surface is gradually thinner than its bottom surface. Item 1. Water absorption guidance device for a jet-propelled personal watercraft according to item 1. 3. When viewed from the lateral direction of the hull (A), the bottom surfaces of the straightening walls (27) and (28) are formed into a V-shape that gradually expands downward toward approximately the middle part in the fore-and-aft direction. A water absorption guiding device for a jet propulsion watercraft according to claim 1. 4. The water absorption guiding device for a jet propulsion personal watercraft according to claim 1, characterized in that another partitioning straightening standing wall (29) is arranged in parallel between the left and right sides of the straightening standing walls (27) and (28). 5. The opening edges of the mounting seats (21) and (22) that face the inside of the lattice are both sloped surfaces (21a) and (22a) that rise at the rear.
2. The water absorption guiding device for a jet propulsion type personal watercraft according to claim 1, wherein the water absorption guiding device is formed as: ). 6. The water absorption guiding device for a jet-propelled personal watercraft according to claim 1, wherein the scope gate (C) is entirely coated with a fluorescent color.