JPH05332138A - Water jet propulsion device - Google Patents

Abstract

PURPOSE:To prevent getting rusty by discharging the water remaining in an engine and mufflers, in a water jet propulsion device. CONSTITUTION:The first pipe 10 connected to an engine 2 and the second pipe 12 connected to mufflers 15 and 16 are connected to a pump 19. This pump 19 is constituted so as to be given the control signals from a controller, and when the pump is operated corresponding to the signal from the controller, the cooling water in the engine 2, mufflers 15 and 16 are discharged out of a ship through the pipes 10 and 12 and the pump 19.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water jet propulsion device, and more particularly to a water jet propulsion device suitable for preventing rust in an engine and a muffler.

[0002]

2. Description of the Related Art Conventionally, in a water jet propulsion apparatus which obtains a predetermined propulsive force by a pump operation of a jet pump, after the pressure water of the jet pump is made to flow as cooling water into a cylinder block of an engine, this The method of passing through the muffler and exhausting with exhaust gas is adopted. According to this, water having a constant temperature can be used as the cooling water.

As shown in FIGS. 9 and 10, the cooling water that has flowed through the engine, as shown in FIGS. 9 and 10, has a hole 33 for discharging the cooling water near the mating surface 32 between the exhaust pipe 30 and the muffler 31. Is formed, and one end of the pipe 35 is connected to this hole, while the other end is connected to the union pipe 36 side provided near the exhaust port 31A of the muffler 31.

[0004]

However, when the cooling water in the water jet propulsion device is seawater, the seawater remains inside the engine when the hull is raised. However, it is extremely disadvantageous for rusting. Therefore, in order to prevent rust, it is necessary to raise the hull to the land and flush it with water, or drive the engine on land for a predetermined time without cooling water, and use engine heat and exhaust pressure to remove the engine and muffler inside. Although a method of evaporating the water of the above is adopted, such a method has a disadvantage that the cooling water cannot be actively discharged. Therefore, seawater remaining in the cylinder block of the engine causes rust,
As a result, the non-negligible problem of corrosion occurs.

Further, in the structure shown in FIGS. 9 and 10, there is a possibility that the cooling water may get into the cylinder because of the structure that the formation position of the hole 33 for discharging the cooling water is close to the exhaust port. However, by directly discharging the cooling water in the direction perpendicular to the exhaust direction, the exhaust resistance is increased and the exhaust efficiency is reduced. In addition, the cooling water is likely to be atomized 37 in the exhaust gas, which causes a problem that the muffling effect is also reduced.

[0006]

It is an object of the present invention to improve the inconvenience of the prior art example, and in particular, when seawater is used as cooling water, the seawater is surely discharged from the engine and the muffler to easily perform the rust prevention treatment. In addition, it is also possible to provide a water jet propulsion device which is expected to maintain a constant silencing effect while performing a predetermined cooling by flowing cooling water from the engine to the muffler without increasing exhaust resistance. That is the purpose.

[0007]

According to a first aspect of the present invention, an engine, a jet pump that obtains a predetermined propulsive force by a driving force of the engine, and a cooling water are supplied to the engine by communicating between the water and the engine. And a second pipe for communicating the muffler located on the exhaust side of the engine with the outboard of the engine, and a pump for sucking and discharging the cooling water in the engine and the muffler through the first and second pipes. A method of providing the pump with a control device that outputs a control signal under a predetermined condition is adopted. As a result, the cooling water can be positively discharged to facilitate the rust prevention treatment, and thus the inside of the engine can be effectively protected from corrosion.

A third pipe is provided between the engine and the muffler to supply the cooling water flowing through the cylinder block of the engine into the muffler, and the discharge port of the third pipe is connected to the inside of the muffler. The configuration is such that it is arranged between the cylinder and the outer cylinder. As a result, the exhaust resistance is reduced as much as possible, and a certain cooling and silencing effect is obtained.

[0009]

The cooling water such as seawater remaining in the engine and the muffler is sucked from the first and second pipes by the pump operating in response to the output signal of the control device, and then forced outboard. Will be discharged to. The cooling water flowing from the engine to the muffler is discharged between the inner and outer cylinders. At this time, the cooling water can be discharged along the inner surface of the exhaust pipe, the contact with the exhaust gas at a right angle can be avoided, and the exhaust resistance can be suppressed as much as possible.

[0010]

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

FIG. 1 shows a block diagram of a water jet propulsion apparatus according to this embodiment, and FIG. 2 shows an external plan view of the apparatus. In these figures,
The engine 2 is mounted at a position slightly rearward of the center of the hull 1. The output of the engine 2 is transmitted to the jet pump 4 via the coupling 3. The jet pump 4 sucks water from the bottom side of the hull 1 by the rotation of an impeller shaft 6 extending in the housing 5 and an impeller 7 fixed to the impeller shaft 6, and a rear discharge port 8
A predetermined propulsive force can be obtained by discharging more.

In the vicinity of the impeller 7 of the jet pump 4, one end of a first pipe 10 is connected, and the other end is connected to the engine 2, and the cooling water is supplied to the engine 2 by the pump pressure of the jet pump 4. Can be supplied to. In the middle of the first pipe 10, a first valve 11 capable of appropriately blocking the flow of cooling water to the engine 2 is provided.
And a second valve 12 for circulating cooling water sucked from the inside of the engine 2 to a pump side described later.

Exhaust pipe 2A of the engine 2
Is provided with a first muffler 15 forming a muffler and a second muffler 16 connected to a rear stage side of the first muffler 15 via a tube 17,
The one end of the second pipe 18 is connected to the muffler 16 and the other end is connected to the third valve 20 and the pump 19
The cooling water remaining in the engine 2 and the mufflers 15 and 16 can be discharged to the outside by connecting the engine 2 and the muffler 15 and 16 to the outside.

A third pipe 21 is provided between the engine 2 and the first muffler 15, and the third pipe 21 exhausts the cooling water flowing through the cylinder block of the engine 2 to the muffler. It is made to flow to 15 and discharged to the outside together with the exhaust gas.

The first to third valves 11, 12, 20
1 is provided so as to be opened and closed by the control device 23 as shown in FIG. 1, and the control device 23 has a main switch 25 and a main switch 25 of the operation section 23 provided on the cockpit side as shown in FIG. ON-OF of pump switch 26
The F information and the position information of the control lever 27 are provided so that they can be input. Further, the control device 23 is connected to a timer 28 that operates under the conditions described later.

As shown in FIG. 4, the control device 23 outputs a timing operation signal to the timer 28 on condition that the control lever 27 is in the neutral position N when the main switch 25 is turned off. While operating the timer 28 and controlling the engine 2 to be continuously driven, while operating the pump 26,
The first valve 11 is shut off to stop the supply of cooling water. Also, at the same time, the second and third valves 1
Open engine 2 and 20 to open engine 2 and muffler 15, 1
The cooling water in 6 is sucked by the operation of the pump 26 and discharged to the outside of the ship. The driving time of the engine 2 at this time is a preset time within a range in which the seizure of the engine 2 does not occur, and the time is stored in the control device 23 in advance and all functions are performed after driving the engine for a predetermined time. It is supposed to stop.

The discharge side of the third pipe 21 is, as shown in FIGS. 5 and 6, the inner cylinder 15 of the first muffler 15.
It is connected to a substantially L-shaped union pipe 29 arranged between A and the outer cylinder 15B. The discharge port 29A of the union pipe 29 is oriented in a direction parallel to the direction of exhaust gas flow, and the outer cylinder 15B has a small diameter portion 15D formed through a step 15C to form a gap D between the inner and outer cylinders.
1 is set to be smaller than D2. As a result, the cooling water flowing from the second pipe 21 is made to flow along the inner wall surface of the tube 15 to the muffler 16 in the subsequent stage according to the flow of the exhaust gas.

According to the present embodiment as described above, when the cooling water is discharged, the control device detects whether or not the position information of the control lever 27 when the main switch 25 is turned off is the neutral position. Since the cooling water in the engine 2 and the mufflers 15 and 16 can be automatically sucked and discharged to the outside of the ship by a predetermined valve operation and pump operation, complete discharge of the cooling water is achieved and rust etc. It is possible to effectively prevent the occurrence of the occurrence, and thus it is possible to obtain the effect that it can be expected to prevent corrosion.

Moreover, the controller 2 discharges the cooling water.
Since 3 automatically controls when the predetermined condition is detected, there is no fear that the operator forgets to perform the cooling water discharge process, and it can be expected that the conventional inconvenience will be solved.

Further, since the time for discharging the cooling water is set in advance by the time measured by the timer 28, the operator can effectively prevent the seizure of the engine 2 without being restricted by the discharging work. Can be prevented.

Since the cooling water flowing from the third pipe 21 flows along the exhaust gas flow flowing in the muffler 15, cooling of the mufflers 15 and 16 is effective while avoiding exhaust resistance as much as possible. There is an effect that can be done. At this time, since the cooling water is not atomized due to the discharge of the cooling water into the exhaust gas, the silencing effect can be maintained constant.

The second pipe 21 is connected to the first muffler 15
However, the present invention is not limited to this, and may be configured to be connected to the second muffler 16 as shown in FIG. 7.

The shape of the outer cylinder 15B is not limited to that shown in FIG. 5. For example, as shown in FIG. 8, the outer cylinder 15B is partially bulged so that the cooling water is contained therein to some extent. It may be configured such that a space that can be used is provided. In short, various design changes are possible as long as the step portion 15C is provided and the small diameter portion 15D is provided on the downstream side of the opening 29A of the union pipe 29.

[0024]

The present invention is constructed as described above, and
According to this, according to this, when seawater is used as cooling water, the seawater can be reliably discharged from the engine and the muffler to easily perform rust prevention treatment, and the engine can be operated without increasing exhaust resistance. It is possible to provide a water jet propulsion device that has an unprecedented excellent effect that cooling water can be caused to flow through the muffler and a predetermined sound deadening effect can be expected.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a plan view showing the overall configuration of the water jet propulsion device in the embodiment.

FIG. 3 is an explanatory diagram of an operation unit in the above embodiment.

FIG. 4 is a flow chart for explaining the operation of the embodiment.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a plan view showing a modified example of the embodiment.

FIG. 8 is a sectional view taken along line CC of FIG.

FIG. 9 is an explanatory view showing a conventional structure.

FIG. 10 is an explanatory diagram showing a conventional structure.

[Explanation of symbols]

 1 Hull 2 Engine 4 Jet Pump 10 First Pipe 12 Second Pipe 15 First Muffler 15A Inner Cylinder 15B Outer Cylinder 16 Second Muffler 19 Pump 21 Third Pipe 23 Control Device

Claims (2)

[Claims] 1. An engine, a jet pump that obtains a predetermined propulsive force by the driving force of the engine, a first pipe that communicates between water and the engine to supply cooling water to the engine, and exhaust gas of the engine. A second pipe that connects the muffler located on the side to the outside of the boat, a pump that sucks and discharges the cooling water in the engine and the muffler through the first and second pipes, and a control signal to the pump A water jet propulsion device, comprising: 2. Between the engine and the muffler,
A third pipe for supplying the cooling water that has flowed through the engine block into the muffler is provided, and the third pipe is also provided.
The water jet propulsion device according to claim 1, wherein the discharge port of the pipe is disposed between the inner cylinder and the outer cylinder of the muffler.