JP3331590B2 - Inlet dust crusher for water jet propulsion ship - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for crushing dust sucked into a water intake duct in a water jet propulsion ship.

[0002]

2. Description of the Related Art Conventionally, a water jet propulsion boat which jets water sucked from a ship bottom as jet water and travels by a reaction force thereof is well known. When such a water jet propulsion ship travels in a place with a lot of floating dust, such as in a harbor, there is a problem that the pump sucks these floating matters and the pump is blocked or cavitation occurs.

[0003] For this reason, various means have been proposed to prevent dust from floating in the casing of the pump. That is, the simplest one is one in which a grid-shaped fixed screen is provided at the water inlet, and one in which the screen is movable to wash away dust to be attached. 6-18196
The publication is an example of a movable screen.

[0004]

However, in the above-mentioned fixed type screen, clogging occurs in a short time on a water surface with a lot of dust and becomes impossible to sail, and even a movable type screen can be moved. It is difficult to completely remove and remove the attached dust. In particular, the string-like dust goes under the screen of the water suction port and enters the water suction duct, where it gets entangled with the blades of the pump and closes it.

[0005] When the screen is clogged or the pump is blocked in this way, there is no other means than stopping the boat and manually removing these dusts, and the pump is underwater, which requires complicated labor. are doing.

[0006]

SUMMARY OF THE INVENTION The present invention is to provide a device capable of automatically crushing dust sucked into the above-mentioned water suction duct and discharging the dust together with the jet. The gist of the invention is as follows. In the water jet propulsion ship, the outlet edge of the water flow is located close to the inlet edge of the water flow of the pump blade in the suction casing on the inlet side of the pump blade, and A rectifying plate that partitions the upper part of the cavity from side to side is provided .
Divide the upper half of the lumen of the water intake duct into right and left, and
Proximity to the drive shaft of the pump running through the suction casing
So that the drawn water flow is along the axis of the casing
At the same time, prevent it from winding around the drive shaft,
Since the blade portion is formed at the outlet edge of the water flow of the current plate,
This blade part and the blade of the pump constitute a pair of cutting blades.
It is.

The blade formed on the current plate has a fixed blade inside the casing, and the blade of the rotating pump serves as an operating blade. Therefore, it is desirable that the dust is not caught and escaped, and is desirably shaped like a saw blade. It is formed to hold garbage.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is constructed as described above, and the water flow sucked from the suction port by the blade of the pump is sucked into the pump by the flow straightening plate without generating a vortex at the inlet of the blade. It is ejected from an ejection nozzle as a jet.

At this time, the dust mixed in the suction water is
It is cut by the blades and blades of the pump, sucked into the pump, and discharged with the jet. That is, the string-like dust contained in the suction water flow is swung in the circumferential direction by the suction flow caused by the rotation of the blades of the pump at the portion that has exited the current plate. Close to the inlet edge of the pump blade, and the blade part is formed on the current plate, so that it becomes the receiving blade, the pump blade becomes the working blade, cuts and crushes string-like dust, and sucks it by the pump. In addition, since the lower edge of the current plate is located close to the drive shaft, it is possible to prevent dust from winding around the drive shaft.

Further , in the present invention, the blade of the pump and the blade portion of the current plate constitute a pair of cutting blades, and the blade portion of the current plate serving as a fixed blade is formed in a saw blade shape to catch dust. It is effective to hold it. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0011]

FIG. 1 is a schematic side view of a water jet propulsion ship embodying the present invention, in which a water intake port 2 is provided at a rear bottom of a hull 1 and illustration is omitted at a rear part of a water intake duct 3. A pump 7 is provided. The stern is provided with a nozzle 4 for jetting the sucked water as a jet. Reference numeral 5 indicates an engine for driving the pump 7.

[0012] Next, a description will be given of a configuration of the above-described water jet device in FIGS. Pump 7 described above
2 is provided in a casing 6 as shown in FIG. 2, and the water sucked into the water suction duct 3 from the suction port 2 is jetted from the stern nozzle 4.

In front of the blades 7a of the pump 7 (based on the traveling direction of the hull), a straightening plate 8 is hung to partition the upper portion of the water intake duct 3 into right and left. That is, the rectifying plate 8 is fixedly provided in the water absorption duct 3, and the lower edge 8 a thereof is brought close to the drive shaft 5 a of the pump 7 so that the upper part of the water absorption duct 3 provided at the inlet of the pump 7 is moved right and left. It is a partition.

Further, the outlet edge of the water flow of the current plate 8 is brought close to the inlet edge 7b of the water flow of the blade 7a of the pump 7, and the outlet edge thereof has a saw blade 8b as shown in the figure. It is formed. In addition, the code | symbol 9 in a figure is the screen provided in the water inlet 2. FIG.

The apparatus according to the present invention is configured as described above, and the water sucked from the water inlet 2 is pressurized by the pump 7 and jetted from the nozzle 4 as a jet to propel the hull 1. At this time, in the present invention, since the flow straightening plate 8 is provided in the water suction duct 3 on the suction side of the pump 7,
It is possible to divide the main flow of water from the water inlet 2 into two parts, straighten the flow, guide it smoothly to the pump 7, and prevent dust contained in the water flow from winding around the drive shaft 5a to efficiently generate a jet. it can.

In the present invention, the outlet edge of the current plate 8 and the inlet edge 7b of the pump 7 are close to each other.
Even if dust is mixed in the water flow, a pair of cutting devices are formed by the current plate 8 and the rotating blades 7a, and these are cut and crushed.
Can be discharged with the jet. In other words, the pump 7 is not blocked even when traveling on the surface of suspended matter such as dust. Further, in cutting and crushing the dust mixed in the suction water, the blade 8b provided on the current plate 8 is formed in a saw blade shape as shown in the figure, so that the dust to be rotated is hooked to the current plate 8. Not only can it serve as a receiving blade, but can also hold dust, and in particular, can efficiently cut and crush string-shaped dust.

[0017]

As described above, according to the apparatus according to the present invention, even when the vehicle travels on the surface of a harbor or the like where there is a lot of suspended matter, the pump is blocked by dust or cavitation occurs in the pump. And can sail with maximum efficiency. In particular, it can automatically treat refuse invading the water intake duct while traveling, and can completely solve the biggest problem of the conventional water jet propulsion ship of this kind.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a water jet propulsion ship according to the present invention.

FIG. 2 is a vertical sectional side view of a water jet propulsion part.

FIG. 3 is a cross-sectional view taken along line XX of FIG. 2;

[Explanation of symbols]

 3 Water absorption duct 5a Drive shaft 7 Pump 7a Blade 8 Rectifier plate 8a Lower edge 8b Blade

Claims (2)

(57) [Claims] In a water jet propulsion ship, the outlet edge of the water flow is located in the water intake duct 3 on the inlet side of the blade 7a of the pump 7 close to the inlet edge of the water flow of the blade 7a of the pump 7, and a rectifying plate 8 which divides the upper part of the inner lumen of the water duct 3 to the left and right is provided, this rectifying plate 8 whose lower edge 8a
Close to the drive shaft 5a of the pump 7,
The upper half of the lumen is divided into left and right,
A blade 8b is formed at the outlet edge of the pump, and the blade 8b and the pump
A pair of cutting blades with the blade 7a
Device for crushing suction dust on a water jet propulsion ship. 2. A blade portion 8b provided on the current plate 8 has a saw blade shape.
The water jet propellant according to claim 1, wherein
A device for crushing suction garbage on the ship.