JPH07215293A - Starter device of water jet propelling device - Google Patents

Abstract

PURPOSE:To start rapidly by a labor saving and power saving method, by providing a suction pipe in which the lower end opening is connected to the upper end and the rear end of an impeller member, a switch valve is inserted at the intermediate part, and the upper end opening is connected to a vacuum tank. CONSTITUTION:While a shutter type valve 13 is installed to a discharge port 4 at the rear end of a duct 11, a vacuum tank 9 and the like to give a negative pressure to an impeller chamber 12 are provided. Prior to the starting, the pressure of the vacuum tank 9 is reduced by a vacuum pump 10. In this case, a switch valve 8 inserted to a suction pipe 14 is closed. And the shutter valve 13 is closed and the discharge port 4 is fully closed. By opening the switch valve 8, the sea water is sucked to the impeller chamber 12 from the water intake by the negative pressure of the vacuum tank 9 so as to fill the impeller chamber 12 with the sea water, and then an impeller 5 is rotated to start a water jet. When a water jet propelling device is started, the switch valve 8 is closed, while the shutter type valve 13 is fully opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter for a water jet propulsion device applied to a super high speed ship.

[0002]

2. Description of the Related Art It is known that a high-speed ship is equipped with a propulsion device that takes in seawater from the outside by using a water jet and discharges the seawater from the stern rearward using a pump principle to obtain thrust. There is. As shown in the vertical sectional view of FIG. 2, this type of propulsion device has an impeller 5 built-in in the middle part thereof, and seawater is introduced from a water intake port 3 at the bottom of the stern to a duct 1
1, and this seawater is discharged from the discharge port 4 which is the rear end opening of the duct 11 to the rear of the ship.

[0003]

When the duct 11 is located below the water line, seawater is filled in the duct when the water jet is activated. Therefore, when the impeller 5 is rotated to discharge the seawater to the outside of the ship. Since the seawater can be taken in from the intake port 3 by the amount of the released seawater, it is possible to continuously take in and release the seawater. However, as shown in the figure, when there is a water jet propulsion device above the water line, it is difficult to take in seawater even if the impeller is rotated because there is air in the duct. Therefore, special measures must be taken to fill the interior of the duct with water, and thus the activation of the water jet takes some time.

The present invention has been proposed in view of the above circumstances, and has a simple structure and a low-priced starter for a water jet propulsion device that can start the water jet propulsion device quickly and labor-savingly. The purpose is to provide.

[0005]

To this end, the present invention introduces external seawater into a rearwardly inclined duct from an intake opening at the bottom of a stern and introduces the seawater into an impeller portion at the rear of the duct, and a built-in impeller. In a water jet propulsion device that pressurizes by means of this and discharges it rearward from the discharge port at the rear end of the duct to obtain thrust, a lower end opening is connected to the upper end to the rear end of the impeller section, and an opening / closing valve is inserted in the middle. A suction pipe having an upper end opening connected to a vacuum tank, a vacuum pump having a suction opening connected to the upper end opening of the vacuum tank, and a shutter-type valve inserted into the discharge opening. .

[0006]

With this structure, the following actions can be performed. That is, before starting, the vacuum tank 9 is depressurized by the vacuum pump 10 in FIG.
Keep 3 closed. At this time, the vacuum tank 9 and the duct 11
The on-off valve 8 between the two is also closed. At the time of start-up, the open / close valve 8 between the vacuum tank 9 and the duct 11 is opened, so that seawater is taken up from the outside of the ship to the water level where the impeller 5 is located via the water inlet. While absorbing the seawater, the impeller 5 is rotated and the seawater is discharged. Therefore, according to the device of the present invention, by using the vacuum tank 9, the seawater is introduced into the duct instantaneously by the action of sucking the seawater at the time of startup, so that the water jet propulsion device can be quickly started. It will be possible.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, one embodiment of the present invention is shown in FIG.

In the above drawing, the same reference numerals as those in FIG. 2 indicate the same devices and members as those in the same drawing, and the major difference of the device of the present invention from the structure of FIG. 2 is that a shutter is provided at the discharge port 4 at the rear end of the duct 11. The mold valve 13 is additionally provided, and the vacuum tank 9 and the like for making the impeller portion 12 a negative pressure are provided. That is, 9 is a vacuum tank attached to the stern part, the lower end of the suction pipe 14 into which the opening / closing valve 8 is inserted opens at the rear end part of the impeller part, and the front end of the vacuum tank 9 lies at the stern part. It is connected to the suction port of the attached vacuum pump 10. Reference numeral 13 is a shutter-type valve attached to the duct 11 immediately in front of the discharge port 4.

In such a structure, the vacuum tank 9 is depressurized by the vacuum pump 10 before starting. At that time, the opening / closing valve 8 inserted in the suction pipe 4 is closed. In this way, at the time of startup, first, the shutter valve 13
And the discharge port 4 is fully closed. Since the water intake 3 is below the water line, it need not be closed. Next, by opening the opening / closing valve 8, the negative pressure of the vacuum tank 9 sucks the seawater from the water intake 3 into the impeller chamber 12, and the impeller part 12
After being filled with seawater, the impeller 5 is rotated to start the water jet. When the water jet propulsion device is activated, the shutter type valve 13 is fully opened and the opening / closing valve 8 is closed.

According to such a device, the shutter type valve is closed at the time of start-up to shut off the outside of the vessel from the inside of the duct 11 and rotate the impeller 5 to fill the inside of the duct with seawater to propel the water jet. The device can be started up quickly. The vacuum tank 9 is decompressed by the vacuum pump 10 before starting, and the opening / closing valve 8 is started at the time of starting.
By opening the, you can also start by sucking seawater up to the impeller section.

[0011]

According to such an apparatus, the following effects can be obtained. (1) It becomes possible to start up without overloading the duct on the water line at the time of starting up. (2) By providing the vacuum tank, seawater does not directly enter the vacuum pump and the vacuum pump is prevented from malfunctioning. (3) If the vacuum is applied for a long time, the capacity of the vacuum pump can be reduced.

[0012] In short, according to the present invention, external seawater is taken into the backward tilt duct from the water intake opening at the bottom of the stern, introduced into the impeller section at the rear of the duct, and pressurized by the built-in impeller. In a water jet propulsion device that discharges this rearward from the discharge port at the rear end of the duct to obtain thrust, a lower end opening is connected to the upper end to the rear end of the impeller section, an opening / closing valve is inserted in the middle, and the upper end opening is a vacuum. A suction pipe connected to the tank,
A vacuum pump having a suction port connected to the upper end opening of the vacuum tank and a shutter-type valve inserted in the discharge port are provided to start the water jet propulsion device quickly and labor-savingly. The present invention is extremely useful industrially because it provides a starter for a water jet propulsion device that has a simple structure and is inexpensive.

[Brief description of drawings]

FIG. 1 is an overall side view of a dual water jet propulsion device showing an embodiment of the present invention.

FIG. 2 is an overall side view of a conventional water jet propulsion device.

[Explanation of symbols]

 1 Hull 2 Water Line 3 Intake Port 4 Discharge Port 5 Impeller 6 Drive Shaft 7 Motor 8 Opening / Closing Valve 9 Vacuum Tank 10 Vacuum Pump 11 Duct 12 Impeller 13 Shutter Valve 14 Suction Pipe

Claims (1)

[Claims] 1. An external seawater is taken into a rearwardly inclined duct from a water intake opening at the bottom of the stern, introduced into an impeller section at the rear of the duct, and pressurized by an internal impeller, and then this is discharged from the duct. In a water jet propulsion device that discharges rearward from a discharge port at the rear end to obtain thrust, a lower end opening is connected to the upper end to the rear end of the impeller portion, an opening / closing valve is inserted in the middle, and an upper end opening is connected to a vacuum tank. A starting device for a water jet propulsion device, comprising: a suction pipe, a vacuum pump having a suction port connected to an upper end opening of the vacuum tank, and a shutter-type valve inserted in the discharge port.