JPH11115891A - Screen device for water suction port of water jet propulsion ship - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically clean a screen of a jet water suction port in a water jet propulsion ship. SOLUTION: A front edge of a screen 7 which can cover the whole surface of a jet water suction port 6 on the bottom of a water jet propulsion ship is pivoted to the suction port 6. A rear end of the screen 7 is connected to a hydraulic piston of a hydraulic cylinder which can be vertically moved. A control device of the hydraulic piston is connected to a timer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a screen device for an intake port of a water jet propulsion ship.

[0002]

2. Description of the Related Art Conventionally, in a water jet propulsion ship,
A grid is provided at the jet water inlet to prevent dust from entering. JP-B-54-18475 and JP-B-56-40078 are examples.

[0003]

However, in a conventional device for preventing intrusion of dust or the like, a fixed grid is generally provided at a suction port of jet water. In such a conventional device, dust is attached. It takes time to remove. When a scraper or the like for removing is installed, this becomes a running resistance. For this reason, there is also known a device provided with a removing device as described in the above-mentioned publication, but even with these, it is not possible to remove dust from the entire suction port.

[0004]

SUMMARY OF THE INVENTION The present invention can solve the above-mentioned problems, and the gist of the invention is that water sucked from underwater is jetted rearward and a hull is formed by the reaction force. In a water jet propulsion ship designed to propel water, a screen capable of covering the entire surface of the water intake port is provided at the water intake port opened into the water, and the front end of the screen is pivotally attached to the front part of the water intake port. At the same time, the lower end of a hydraulic piston inserted and suspended in a hydraulic cylinder provided on the water surface is connected to the rear end of the screen.

[0005] That is, the entire screen is rotated up and down around the front portion by the hydraulic piston. The operation of the hydraulic piston is controlled by a timer connected to the hydraulic control device even by manual operation. The operation may be automatically performed by the hydraulic control device at a time interval.

The present invention is applicable not only to the water inlet provided at the bottom of the boat but also to the water inlet of an outboard motor which is detachably mounted on a small boat. is there. Hereinafter, the present invention will be specifically described with reference to the drawings.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic side view of a water jet propulsion ship according to the present invention, in which reference numeral 1 denotes a hull, 2 denotes a water jet injection nozzle provided on the stern, and 3 denotes jet water. , 4 is a water absorption duct, 5 is a driving engine of the impeller 3, 6 is a jet water suction port, and 7 is a screen provided at the water suction port.

Next, a specific configuration of the screen 7 will be described with reference to FIGS. The screen 7 is shown in FIG.
As shown in the figure, the front end of the screen rod 7b is fixed to the front end pivot tube 7a and formed into a fork shape, and is attached to the front end of the water inlet 6 at the bottom of the ship by a pivot shaft 7c so as to be rotatable up and down. The lower end of a piston 8b inserted into a hydraulic cylinder 8a of a hydraulic device 8 provided on the sea surface is connected to the rear end of the screen rod 7b on one side (based on the forward direction of the hull). The hydraulic device 8 is linked to a control device provided in the cabin and can be operated manually or automatically via a timer or the like.

Next, FIGS. 5 to 8 show examples in which the present invention is applied to an outboard motor. Even in the case of an outboard motor, screen bars 7b are arranged in a fork shape as shown in FIG. The screen 7 is attached to the front end of the water inlet 6 as shown in FIG. 5, and the screen bar 7b on one side is configured to be long.
An operation rod 9 is connected to an operation lever (not shown) on the ship at the end. (See FIGS. 7 and 8)

In the case of an outboard motor, when mounted on a hull,
There is a gap between the tail of the hull and the water intake port of the outboard motor, and there is a possibility that dust is clogged in the gap. It prevents garbage from clogging. (See FIGS. 5 and 6)

The apparatus according to the present invention is configured as described above. When dust floating on the water surface is caught on the screen 7 and clogged,
Is pushed down by the hydraulic piston 8b, the dust caught by the water flow on the bottom of the hull based on the cruising on the hull 1 can be washed backward, and the screen 7 can be regenerated.

That is, the pressed screen 7
However, the water flowing below the hull is washed out while it is projected, and the water flow below the hull at this time is stronger than the suction water flow into the duct. It is what is done. According to the present invention, since the screen 7 can be washed in this manner, water absorption into the water absorption duct 4 is ensured, so that efficient sailing can be performed without generating cavitation in the impeller 3. .

The above-described cleaning operation of the screen 7 can be manually performed when a poor running is detected. However, in a sea area where there are many floating substances on the water surface, the screen 7 is operated by the hydraulic device 8 at regular time intervals using a timer. Is pushed down, the ship is easily maneuvered, and the hydraulic device 8 allows the large screen 7 to be easily moved. In addition, in the case of the large screen 7, if it is supported at the front end and the rear end, it is possible to maintain strength against a strong water flow at the bottom of the ship.

As shown in FIGS. 5 to 7, even when the present invention is applied to an outboard motor, the cleaning operation of the screen 7 is the same as that described above, but the outboard motor is generally small in size. The hydraulic pressure may be used for the operation of pressing down the screen 7, but it may be a manual operation. In the case of an outboard motor, a gap is formed between the hull and the outboard motor. Therefore, as shown in FIGS. 5 and 6, if the prevention plate 10 is provided, dust can be prevented from being clogged in the gap. In particular, the water flow generated below the bottom of the ship is not disturbed, so that the ship is effective for navigating and for cleaning the screen.

[0015]

As is apparent from the above description, the apparatus according to the present invention is a water jet propulsion ship capable of completely cleaning the screen of the jet water suction port using the water flow based on the ship speed. Therefore, the members added for the construction of the cleaning device do not hinder the hull's voyage at all, and the screen itself is supported at two points in front and rear, and is strong. In particular, cavitation occurs in the pump even during the cleaning operation. Therefore, the water jet propulsion ship of this type can be operated without any problem in the contaminated sea area.

[Brief description of the drawings]

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

FIG. 2 is a vertical sectional side view of a water intake port provided in a ship bottom.

FIG. 3 is a front view similarly viewed along the line AA of FIG. 2;

FIG. 4 is a bottom view of a screen provided at a water inlet in FIG. 2;

FIG. 5 is a longitudinal sectional side view of an outboard motor portion when the present invention is applied to an outboard motor.

FIG. 6 is a bottom view of the water inlet shown in FIG. 5;

FIG. 7 is a side view of a screen provided at a water inlet of FIG. 5;

FIG. 8 is a plan view of the screen shown in FIG. 7;

[Explanation of symbols]

 6 suction port 7 screen 8a hydraulic cylinder 8b hydraulic piston 10 prevention plate

Claims (4)

[Claims] 1. A water jet propulsion boat in which water sucked from underwater is jetted rearward to propel the hull by its reaction force, the water suction port 6 opened into the water, the entire surface of the water suction port 6 is provided. Provide a screen 7 that can be covered,
The front end of the screen 7 is pivotally connected to the front of the water inlet 6, and the rear end of the screen 7 has a hydraulic piston 8b inserted and suspended in a hydraulic cylinder 8a provided on the water surface.
Of a water jet propulsion ship with the lower end connected. 2. The water inlet screen device for a water jet propulsion ship according to claim 1, wherein an operating device of said hydraulic piston 8b is connected to a timer and is operated at every elapse of a fixed time. 3. The water jet screen device for a water jet propulsion ship according to claim 1, wherein said water suction port is provided on an outboard propulsion device which is formed separately from the hull and is detachable from the hull. 4. The water inlet screen device for a water jet propulsion ship according to claim 1, wherein a prevention plate is provided in front of a pivotal portion of the screen provided in the water inlet.