JP3059164B1 - Vertical water jet thruster - Google Patents

Abstract

[Problem] It is difficult to remove marine products attached to the inside of a casing. SOLUTION: In a vertical water jet propulsion device W which sucks water from a water intake 9 at a central portion of a casing 3 and discharges a jet from a discharge port 16 through a diffuser 11 and a pressure chamber 13 inside the casing 3 to generate a thrust. A bell mouth 10 which forms a water intake 9 in a central portion below the casing 3 and is connected to a diffuser 11 at an upper end, and a donut-shaped region formed between the lower peripheral portion of the casing 3 and the lower peripheral portion of the bell mouth 10; This is a vertical water jet propulsion device that is configured separately from the casing 3 and the bell mouth 10, and further includes a donut-shaped bottom plate 14 having a discharge port, which is detachably attached to the casing 3 and the bell mouth 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical water jet propulsion device having a detachable bottom plate separate from a casing for forming an intake port and a discharge port at a lower portion of the casing.

[0002]

2. Description of the Related Art A vertical water jet propulsion device is configured so that an intake port and a discharge port are flush with the bottom of a ship, and does not protrude from the bottom of the ship. Due to its shallow depth, it is often used for hull-shaped vessels that cannot secure sufficient propeller depth and cannot be equipped with ordinary tunnel-type thrusters. In addition, the body is 360 °
, The thrust can be generated in any direction, and the maneuverability of the ship at the time of leaving and approaching the shore can be improved.

[0003] Prior art disclosing this type of vertical water jet propulsion is disclosed in Japanese Patent Application Laid-Open No. 6-278,692.
JP-A-6-286693, JP-A-7-52882
And JP-A-8-58688.

FIG. 5 is an overall front view of a vertical water jet propulsion device disclosed in Japanese Patent Application Laid-Open No. 8-58688, in which a casing portion is shown in cross section. FIG.
In the vertical water jet propulsion device 50, the casing 5
1 is divided into an upper casing 52 and a lower casing 53 in the vicinity of the central position in the vertical direction, and is directly attached to the upper casing 52 with bolts 60a and 60b. A diffuser 54 is formed in the upper casing 52, and a bell mouth 56 forming a suction port 55 is connected to the lower casing 53 by a bolt 57.

[0005]

Since the vertical water jet propulsion device 50 is equipped to improve the maneuvering at the time of leaving and approaching the shore, the water jet propulsion device 50 stops during navigation, and the inside of the casing 51 (the pressure chamber 58) in FIG. Seawater becomes stationary and stagnates. For this reason, marine products (Fujitsubo, mussels, etc.)
59 propagates in large quantities, adheres tightly to the inner surface of the casing 51 and the bell mouth 56, and the resistance of the flow path, that is, the fluid resistance increases, so that the efficiency gradually decreases with the service time. Therefore, unless the shellfish are removed on a regular basis, the intended performance of the machine will not be sufficiently exhibited.

Therefore, it is usually necessary to dock the ship every 1 to 1.5 years for disassembly and cleaning. However, removing the entire vertical water jet propulsion device 50 from the hull and disassembling it requires a large amount of work and requires a long time. Dock construction. On the other hand, shipyards and shipowners have requested that disassembly and assembly can be easily performed so that the dock period is shortened.

In the vertical water jet propulsion device shown in FIG. 5, it can be disassembled at the intermediate portion of the casing 51, but a long spanner wrench is required, and workability is poor due to upward work from the dog bottom.

The bolts are provided not only on the bolt 60a on the outer periphery of the casing 51 but also on the inner peripheral side 60b, and the casing 51 having a two-part structure is integrated. Further, the bell mouth 56 is attached to the lower casing 53. Therefore, to disassemble and clean the casing,
The bolt 60a is removed with a long spanner wrench 61, then the bolt 57 is removed with a spanner, and the bell mouth 56 is disassembled and removed downward. Next, the impeller 62 is disassembled downward and removed. After that, it is necessary to remove the bolt 60b on the inner peripheral side with a similarly long spanner wrench, and it is a construction type that can be finally disassembled in some work steps. For this reason, the number of working days is required to be long, and considerable labor is required.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention draws water from a water intake at a central portion of a casing and discharges a jet from a discharge port through a diffuser and a pressure chamber inside the casing. A vertical water jet propulsion device that generates thrust, with a water intake formed at the center of the lower part of the casing, a bell mouth connected to the diffuser at the upper end, and formed between the lower peripheral part of the casing and the lower peripheral part of the bell mouth. And a donut-shaped bottom plate having a discharge port, which is formed separately from the casing and the bell mouth and is detachably attached to the casing and the bell mouth.

Thus, even if marine products such as shellfish adhere to the inside of the casing, the donut-shaped bottom plate separate from the casing and the like can be easily removed. Therefore, the working time can be shortened.

If a step is formed on the outer periphery of the bottom plate to engage with the periphery of the lower end of the casing, the positioning at the time of mounting the bottom plate becomes easy, which leads to a reduction in the operation time.

When only the outer peripheral portion of the bottom plate is attached to the peripheral portion of the lower end of the casing with bolts, the work time can be shortened because the bottom plate can be attached to and detached from the casing simply by attaching and detaching the bolts. Normally, the bottom plate and the casing are attached and fixed only with bolts, and the bell mouth is fixed to the bottom plate with bolts, but the upper end of the bell mouth and the inner periphery of the diffuser are only fitted and inserted and the bolt is It is not integrated by such as.

Further, when the upper end portion of the bell mouth and the inner peripheral portion of the diffuser are fitted to each other, more specifically, the inner peripheral portion of the diffuser is extended in a cylindrical shape, and the extended portion has a bell mouth. Preferably, the upper end is fitted. This allows
Since the upper end of the bellmouth is not fixed and only the bellmouth needs to be removed from the bottom plate, the time required to remove the bellmouth when cleaning the inside of the casing is greatly reduced.

In this case, if a labyrinth seal is provided at the upper end of the bell mouth fitted to the diffuser, it is possible to prevent water flow from leaking from a gap between the diffuser and the bell mouth. Further, if a stepped portion is provided on the inner peripheral portion of the bottom plate and the lower end portion of the bell mouth to form and fit each other, positioning and centering of the bell mouth are facilitated.

In the center of the bottom plate, there is provided an opening for a water intake, side discharge ports on both sides of the opening, and a donut-shaped bottom plate having a center discharge port formed between both side discharge ports. It is preferable that the part having the center discharge port and the side discharge ports is a cast product. Then, the bottom plate can be easily manufactured with high accuracy. In other words, the structure of the complicated discharge port,
That is, the shape, inclination, and mounting interval of the guide vanes formed in the discharge ports are made uniform, and the accuracy can be ensured.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing a part of a water jet propulsion apparatus according to the present invention in a cross-sectional view, and FIG. 2 is a view showing a vertical water jet propulsion apparatus viewed from the bottom.

The water jet propulsion machine W has a hull bottom 1
A gear box 5 having a built-in power transmission mechanism is provided upright at the center of a base 4 in a state in which a cylindrical casing 3 is housed in an opening 2 of the base. The casing 3 includes a swing motor 6 provided on the side of the gear box 5.
It is constituted so that it can turn freely.

An impeller shaft (not shown) hangs at the center of the casing 3 and has a boss 7 at its lower end. The boss 7 has an impeller 8 provided radially. A bell mouth 10 having a circular water intake 9 at a lower end is provided below the impeller 8, and a tip of the impeller 8 is close to an upper part of the bell mouth 10. A diffuser 11 is provided so as to be continuous with the upper end of the bell mouth 10. The diffuser 11 is provided with a passage for the water flow pushed upward by the impeller 8, and is provided with a vane 12 for deflecting the swirling flow of the water flow into a radial flow.

The diffuser 11 is formed separately from the casing 3, and the inner peripheral end of the lower wall 11a is formed to extend downward in a cylindrical shape. The upper end of the bell mouth 10 is inserted into the cylindrical extending portion 11b. 10b are closely fitted (fitted). The extension portion 11b and the upper end portion 10b of the bell mouth are made as close as possible to prevent leakage of water flow. Therefore, FIG.
As shown in FIG. 5, a labyrinth seal S may be formed in this close portion.

A pressure chamber 13 is formed between the diffuser 11, the bell mouth 10 and the casing 3. As will be described in detail later, a donut-shaped bottom plate 14 is provided in a donut-shaped region formed between the lower end of the casing 3 and the lower end of the bell mouth 10 so as to be assembled and disassembled (detachable). . The water flowing out of the diffuser 11 enters a pressure chamber 13 communicating with the diffuser 11, and water in the pressure chamber 13 is ejected from a discharge port 16 having a guide vane 15 formed in a bottom plate 14 to generate a thrust. .
By rotating the casing 3, the discharge port 16
Can be freely changed by 360 °.
The lower end of the bell mouth 10 has a flared shape and forms an intake port 9, and a lattice 17 is provided so that dust, driftwood and the like are not sucked through the intake port 9 (FIG. 2).

FIG. 4 is a plan view showing only the bottom plate 14.

The bottom plate 14 has a donut shape in a plan view, and has an opening 18 for a water intake at the center thereof.
Side discharge ports 16a and 16b are formed on both sides with the center discharge port 16c formed between both side discharge ports 16a and 16b. Center outlet 16c and side outlet 1
The portions other than the portions where 6a and 16b are present are flat plates, and reinforcing ribs 19 are protruded radially therefrom. The portion where the center discharge port 16c and the side discharge ports 16a and 16b are present and the flat plate portion 20 are formed separately (the former is a cast product and the latter is made of a steel plate), and are joined together by welding at the X-ray position to be integrated. I have. By casting, a complicated discharge port structure having the guide vanes 15 can be easily manufactured. That is, the shape, inclination, and mounting interval of the guide vanes formed in the discharge ports are made uniform, and the accuracy can be ensured.

As shown in FIG. 1, the inner peripheral portion of the bottom plate 14 is fixed to the lower end of the bell mouth 10 with bolts 22, and the outer peripheral portion is fixed to the lower end of the casing 3 with bolts 21.

Further, the connection structure will be described in detail. As shown in FIG. 1, a thick portion 3 a having a rectangular cross section is formed at the lower end of the casing 3.
At the lower end of the circumference. The lower end of the bell mouth 10 is spread in a trumpet shape, and the outer peripheral portion thereof is
a is formed. The outer peripheral portion of the bottom plate 14 has a step portion 1 on the upper surface.
A thick portion 3a at the lower end of the casing 3 is fitted into the step portion 14a so that the positioning of the bottom plate 14 is ensured. At this time, the side surfaces are flush with each other, and the bolt 21 is screwed upward from the bottom so as to be embedded in the bottom plate 14. Also,
Submerged step 14b (inverted L-shaped section) on the inner periphery of bottom plate 14
And the upper step part 1 of the bell mouth 10
The bell mouth 10 is reliably positioned by being fitted with the reference numeral 0a. The bottom surface is flush, and the bolt 22 is screwed upward from the bottom so as to be embedded in the bell mouth 10 side.

According to the above configuration, the bell mouth 10 can be easily removed downward simply by removing the bolt 22 on the bell mouth 10 side from the inner peripheral portion of the bottom plate 14. Next, if the bolt 21 on the outer peripheral portion of the bottom plate 14 is removed, the bottom plate 14 can be easily removed downward. Bell mouth 10 and bottom plate 14
Is removed, the inside of the casing 3 is opened to the outside, so that the work of removing marine products such as shells that have landed on the inner surface of the casing 3 can be easily and quickly performed.

Further, the cylindrical extension 11b of the diffuser 11 and the upper end 10b of the bell mouth 10 are only fitted (fitted), and are not integrated by bolts or the like. The bottom plate 14 can be easily removed downward together with the bell mouth 10 simply by removing it. Therefore, it is possible to work in a very short time as compared with a structure type which can be finally disassembled in several work steps like a conventional vertical water jet propulsion machine.

[0028]

The present invention is embodied in the form described above and has the following effects.

Even if marine products such as shells adhere to the inside of the casing, the bottom plate separate from the casing can be easily removed, so that the shells and the like inside the casing can be easily removed and cleaned. Can also be shortened.

[Brief description of the drawings]

FIG. 1 shows a water jet propulsion device W according to the present invention,
It is the front view which showed the one part in cross section.

FIG. 2 is a bottom view of the water jet propulsion device of the present invention.

FIG. 3 is an enlarged view of a case where a labyrinth seal is formed at an upper end of a bell mouth fitted to a diffuser.

FIG. 4 is a plan view showing only a bottom plate.

FIG. 5 is a front view showing a part of a conventional vertical water jet propulsion device in cross section.

[Explanation of symbols]

 W ... Vertical water jet propulsion machine 3 ... Casing 3a ... Thick part 8 ... Impeller 9 ... Intake port 10 ... Bell mouth 10a ... Step part 11 ... Diffuser 13 ... Pressure chamber 14 ... Bottom plate 14a, 14b ... Step part 15 ... Guide Vane 16 ... Discharge port 17 ... Lattice 18 ... Opening 21,22 ... Bolt S ... Labyrinth seal

Claims (8)

(57) [Claims] 1. A vertical water jet propulsion device that generates thrust by sucking water from a water intake at a central portion of a casing and discharging a jet from a discharge port through a diffuser and a pressure chamber inside the casing to generate a thrust. A bell mouth that forms a water intake in the center and connects to the diffuser at the upper end, and a donut-shaped region formed between the lower peripheral edge of the casing and the lower peripheral edge of the bell mouth are separately provided from the casing and the bell mouth. A vertical water jet propulsion device having a donut-shaped bottom plate having a discharge port, which is configured and detachably attached to these. 2. The vertical water jet propulsion device according to claim 1, wherein a stepped portion is formed on an outer peripheral portion of the bottom plate to engage with a peripheral portion of a lower end of the casing. 3. The vertical water jet propulsion device according to claim 1, wherein only an outer peripheral portion of the bottom plate is attached to a peripheral portion of a lower end of the casing with bolts. 4. The vertical water jet propulsion device according to claim 1, wherein an upper end portion of the bell mouth and an inner peripheral portion of the diffuser are fitted to each other. 5. An inner peripheral portion of the diffuser is extended in a cylindrical shape,
5. The vertical water jet propulsion device according to claim 4, wherein an upper end of a bell mouth is fitted into the extension portion. 6. The vertical water jet propulsion device according to claim 4, wherein a labyrinth seal is provided at an upper end of the bell mouth fitted to the diffuser. 7. The vertical water jet propulsion device according to claim 4, wherein a stepped portion is provided on each of an inner peripheral portion of the bottom plate and a lower end portion of the bell mouth and fitted. 8. An opening for a water intake in a central portion of the bottom plate,
2. A doughnut-shaped bottom plate having side discharge ports on both sides of the opening and a center discharge port formed between the side discharge ports on both sides, a portion having the center discharge port and the side discharge ports is a cast product. The vertical water jet propulsion device as described.