JPH0516594U - Simplified side thruster for small ships - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a simplified side thruster suitable for small ships. [Structure] In a small boat equipped with a marine diesel engine of about 100 PS cooled by a fresh water cooling device, sea water from a sea water pump 9 used in this fresh water cooling device is passed through a switching valve SOL0. To branch. By opening this branch pipe on both the left and right sides and jetting seawater, a side thrust force is generated. Therefore, it is not necessary to separately provide a power source for the side thrust force.

Description

[Detailed description of the device]

The present invention relates to a simplified side thruster for a small boat.

[0002]

[Prior art and its problems]

 In general, a side thruster installed on a ship refers to one in which a cylindrical penetrating portion is provided in the lateral direction below the waterline of the hull at the bow or stern, and a lateral thrust generating device is provided here. This side thruster is often equipped in a large ship, for example, in a ship such as a ferry with a large number of departures and arrivals from a shore, in order to change the direction independently (see, for example, Japanese Utility Model Publication No. 56-36719). However, since small boats have relatively good maneuverability and can be moved with labor saving, side thrusters are not particularly required for operation by rope pulling from the opposite shore.

However, the demand for the side thruster function has been increasing in the face of a shortage of manpower and aquaculture and fisheries in recent years even for small ships. Therefore, various proposals have been made for side thrusters of small ships. For example, a seawater pump equipped on a small boat is connected to a multistage switching valve installed below the waterline outside the hull, and a waterjet pipe is projected in multiple directions from this switching valve to operate this switching valve. A simple side thruster for small boats has been proposed in which a water jet pipe is selected for communication with each other and the jet direction of seawater is changed to make a small movement of the small boat in any direction. 56-55119).

However, the proposed side thruster particularly needs a seawater pump for the side thruster, which increases the equipment cost and is not suitable for a small ship, and the switching valve is located outside the hull and is below the water line. Since it is mounted so as to protrude, it is difficult to operate it, and there is also the problem of hindering berthing.

[0005]

[Means for Solving the Problems]

 Therefore, the present invention has been devised to solve the problems of the conventional example, and the gist of the invention is to cool it with a fresh water cooling device including a fresh water cooler, a sea water pump, and a fresh water pump. In a small boat equipped with a marine diesel engine, a water jet line is connected between the fresh water cooler and the sea water pump via a main switching valve, and the water jet is connected to the water jet line. By branching the pipelines to the port and starboard sides of the hull and opening below the water line of the hull to form jet ports, the branch pipes corresponding to the jet ports intervene in these branch pipelines, so that the It is a simplified side thruster for small ships, which is characterized by generating thrust.

[0006]

【Example】

The structure of the present invention, together with its operation, will be described in detail by the embodiments shown in the accompanying drawings. 1 is a schematic diagram of an embodiment of the present invention, FIG. 2 is a piping diagram, and FIG. 3 is a development view of an operation cam switch for controlling a solenoid valve. The small vessel referred to in the embodiments of the present invention means a vessel equipped with a marine diesel engine of 200 PS or less, which is applied to a leisure or fishing boat, and the engine is cooled by a fresh water cooling system. Pointing to something. Therefore, the seawater for cooling is sucked up by the seawater pump from the Kingston cock (check valve) on the bottom of the ship, and the seawater discharged from the seawater pump is a fresh water cooler (also called a heat exchanger for engine cooling water). It is designed to be discharged to the outside of the ship through the. The amount of seawater for cooling is 60 to 80 liters / PSh-water pressure of 1.5 kgf / cm ² G (however, this water pressure is at the pump discharge port) for a marine diesel engine of 100 PS or less. Therefore, the discharged seawater for cooling is sufficiently equipped with the thruster function of the ship.

A FRP hull 1 is equipped with a propeller-type propulsion device 2 at its stern, and the propulsion device 2 is driven by a marine diesel engine 3 installed in the hull 1. It has become. An engine cooling water pump (also called a fresh water pump) 4 is attached to the engine 3, and an engine cooling water inlet pipe line 5 attached to the engine cooling water pump 4 and an engine cooling water attached to the engine 3 are attached. The outlet pipe 6 is connected in a closed loop shape, and a thermostat (not shown), an engine cooling water pump 4, a clutch oil cooler, an engine are connected to the closed loop-shaped pipe line. An oil cooler, a cylinder block jacket, a cylinder head jacket, an exhaust manifold holder jacket, a head tank (all not shown), and a fresh water cooler 7 are interposed. On the other hand, the seawater for cooling is sucked up by a seawater pump 9 driven by the engine 3 from a check valve (Kingston cock) 8 provided on the bottom side of the ship, and the seawater for cooling discharged from the seawater pump 9 is It is discharged to the outside of the ship through the fresh water cooler 7.

The above structure is a normal fresh water cooling device for a small boat, but in this embodiment, the following side thruster is attached to this device. That is, in the supply pipe 10 connected between the fresh water cooler 7 and the seawater pump 9, the main electromagnetic switching valve SOL0 and the fine flow orifice 12 bypassing the main electromagnetic switching valve SOL0 are interposed. . Even if the main electromagnetic switching valve SOL0 is closed, a slight amount of seawater flows into the fresh water cooler 7 for cooling, and the fine flow orifice 12 cools the engine cooling water. A water jet conduit 13 is connected to the main electromagnetic switching valve SOL0. The water jet conduit 13 is branched and opened on the starboard side and the stern side of the hull 1 on the starboard side and the port side, respectively. Therefore, these openings form the first, second, third and fourth jet ports 14a, 14b, 14c and 14d below the waterline of the hull 1. A first solenoid valve SOL1, a second solenoid valve SOL2, a third solenoid valve SOL3 and a fourth SOL4 are interposed on the upstream side of the branch pipes corresponding to these jet ports 14, respectively. The operations of the first to fourth electromagnetic valves SOL1 to SOL4 and the main electromagnetic switching valve SOL0 are set at one place and controlled by the cam switch 15 as shown in FIG. In addition, these solenoid valves have a butterfly valve that is electrically operated to provide corrosion resistance.

In FIG. 3, 16 is a pilot lamp symbol when the thruster is operating, 17 is a pilot lamp symbol when the hull 1 is traveling, and in the development view of the cam switch 15, a is left of the bow, that is, A switch that opens the first solenoid valve SOL1 in order to eject the cooling seawater to the first jet port 14a and closes the others. Similarly to this, b is the stern left, c is the right bow, d is the stern right, e is the left parallel movement, and f is the switch operated for right horizontal movement, and R _{0 to} R ₄ are the respective switches. The relay of the solenoid valve is shown. In addition, in FIG. 1, 18 shows the discharge pipe of the cooling seawater. Although not shown, each of the first to fourth jet ports 14a to 14d forms a slight throttle to form a nozzle, and the jet pressure thereof is increased with respect to thruster operation. Furthermore, these jet outlets 14a to 14d are closed by dynamic pressure during normal traveling or by an electromagnetic knob block device to reduce traveling resistance and prevent adhesion of oysters and entry of dirt. .

Next, the operation of the present embodiment will be described. During normal cruising, the main electromagnetic switching valve SO L0 is operated to remove all of the cooling seawater discharged from the seawater pump 9 by the fresh water cooler 7. And perform normal cooling with fresh water. Next, when operating the side thruster by berthing or the like, for example, when berthing the hull 1 to the right shore, the engine 3 is switched to a low speed and the propulsion device 2 is stopped. Next, the main electromagnetic switching valve SOL0 is switched to introduce the entire amount (however, a small amount of it flows from the orifice 12 to the fresh water cooler 7) of the cooling seawater into the water jet pipe line 13. At the same time, when the switches for the bow left a and the stern left b, that is, the switch e are turned on, the first and second solenoid valves SOL1 and SOL2 are opened, and the first and second jet ports 14a on the port side are opened. , 14b are opened by the water pressure, and the seawater for cooling jets. The thrust causes the hull 1 to berth on the right bank. At this time, since the engine 3 drives only the seawater pump 9 at a low speed, the engine cooling water is not required.

In this embodiment, the solenoid valves are used to switch to the first to fourth jet ports 14a to 14d, but the present invention is not limited to this, and a mechanical manual switching valve is used. May be used. In addition, for a single fishing boat or a small boat that removes seaweed, jet ports may be opened at two locations, the stern right and the bow left. Further, the flow rate control to the first to fourth jet ports 14a to 14d may be performed by the main electromagnetic switching valve SOL0 to obtain a special low speed.

[0012]

[Effect of the device]

 According to the present invention, a small boat equipped with an engine having a fresh water cooling device is propelled to the side by the sea water pump of the fresh water cooling device, so that no special propulsion pump is required and the ship is stopped. Since it is sometimes used, there is no problem in cooling the engine, and it can be made simple and inexpensive. In addition, since the spouts are only opened on both sides, there is no problem with berthing, etc., and it is not necessary to change the hull significantly at the time of shipbuilding. Good.

[Brief description of drawings]

FIG. 1 is a schematic view of an embodiment of the present invention.

FIG. 2 is a piping diagram.

FIG. 3 is a development view of an operation cam switch of a solenoid valve.

[Explanation of symbols]

1 ... Hull, 3 ... Marine diesel engine, 7 ... Fresh water cooler,
9 ... Seawater pump, 14 ... Jet port, SOL0 ... Main solenoid switching valve

Claims (1)

[Scope of utility model registration request] 1. A small boat equipped with a marine diesel engine cooled by a fresh water cooling device including a fresh water cooler, a pump for sea water, and a pump for fresh water, wherein between the fresh water cooler and the pump for sea water, A water jet line is connected through the main switching valve, and the water jet line is branched to the port and starboard sides of the hull to open below the water line of the hull to form a jet port, and these branch pipes are formed. A simplified side thruster for a small boat, characterized in that a side thrust is generated when the ship is stopped by interposing an opening / closing valve corresponding to the jet port in the road.