JPH0811789A - Water jet propulsion device with astern means - Google Patents

Abstract

PURPOSE:To simplify structure and attain light weight by forming such structure that an inner flap and an outer flap are overlapped with each other into the horizontal state so as to close the bottom part opening of a discharge duct when an operating lever is operated forward, and as a result flow from a water jet pump is jetted backward to generate ahead action. CONSTITUTION:When the upper end of an operating lever 3 is operated forward, an inner flap 5 and an outer flap 7 are overlapped with each other into the horizontal state so as to close the bottom part opening 2b of a discharge duct 2. Flow 11 led into the discharge duct 2 from a water jet pump 1 is thereby jetted as water jet from the rear opening 2a of the discharge duct 2 to go ahead. At the time of maneuvering a ship into the astern state, the operating lever 3 is operated backward. The inner flap 5 is thereby erected obliquely upward, and the outer flap 7 is turned obliquely downward to open the bottom part opening 2b. The flow 11 therefore changes to the backward direction to generate astern action.

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 apparatus used for ships, and more particularly to a water jet propulsion apparatus provided with a reverse means.

[0002]

2. Description of the Related Art As a conventional water jet propulsion apparatus with a reverse drive unit, there is one shown in FIG. 7 (longitudinal cross-sectional view), which receives a flow from a water jet pump (not shown) and moves backward from a rear opening 2a. A discharge duct 2 capable of ejecting is provided as a main body. A bottom opening 2b is formed on the bottom wall of the discharge duct 2.

An intermediate portion of an operating lever 3 is pivotally attached to a rear end portion of the discharge duct 2 by a horizontal horizontal shaft 4, and an inner flap 5 capable of closing the bottom opening 2b is attached to a lower end portion of the operating lever 3. , Is fixed in a state of intersecting with the operation lever 3.
Further, an outer flap 7 whose rear end is pivotally attached by a horizontal horizontal shaft 6 is provided in the vicinity of a connecting portion of the inner flap 5 to the operation lever 3, and one end of the outer flap 7 is attached to a rib 7a of the outer flap 7 by a pin 8. The other end of the pivotally connected connection link 9 is pivotally attached to the lower portion of the discharge duct 2 by a pin 10.

In such a conventional water jet propulsion device with reverse means, when the upper end of the operating lever 3 is operated backward by an operation cylinder (not shown) as shown in FIG. 7, the inner flap 5 moves diagonally upward. Standing up, the outer flap 7 is swung downward, the flow 11 of the water jet introduced into the discharge duct 2 is turned downward by the inner flap 5, and further forward by the outer flap 7. It is converted into a stream 11 '.

Then, in order to return the apparatus to the forward traveling state again, the upper end of the operating lever 3 may be operated forward, and at that time, the horizontal horizontal shaft 6 is moved to a position 6'in FIG. At the same time, the flaps 5 and 7 are in a horizontal state in which they overlap each other and close the bottom opening 2b. In this state, since the ribs 5a and 7a exist between the flaps 5 and 7, the front of the bottom opening 2b of the discharge duct 2 is prevented so that the water flow does not flow from the front between the flaps 5 and 7. A rectifying wall 2c protruding downward is attached to the edge.

[0006]

By the way, in the conventional water jet propulsion apparatus with the reverse means as described above, the inner flap 5 is directly pivoted to the discharge duct 2 by the horizontal lateral shaft 4, but the outer flap 7 is provided. Since it is pivotally attached to the inner flap 5 by a horizontal horizontal axis 6 and is pivotally attached to the connecting link 9 by a pin 8, it is not directly pivotally attached to the discharge duct 2. Therefore, there is a problem in that the weight is increased.

Further, since the inner flap 5 is provided above the rib 5a, a large gap is created between the inner flap 5 and the outer flap 7, and a rectifying wall 2c for closing the gap is required.
There is also a problem that the shape is complicated. The present invention is intended to solve the above-described problems, and improves a link mechanism for mounting an inner flap and an outer flap provided in a bottom opening of a discharge duct to simplify a structure and reduce a weight. It is an object of the present invention to provide a water jet propulsion device with a reverse drive means.

[0008]

In order to achieve the above object, a water jet propulsion device with reverse traveling means of the present invention receives a flow from a water jet pump and injects a water jet rearward from a rear opening in a ship. The discharge duct, and a bottom opening on the bottom wall of the discharge duct.
A lower end portion is provided at a rear end portion of the discharge duct at a lower side of a rib integrally formed so as to intersect with an operation lever pivotally attached to a first horizontal horizontal axis and a lower end extension portion of the operation lever. And an inner flap capable of closing the bottom opening in a horizontal state when the upper end of the operation lever is operated forward, and one end pivotally connected to a joint between the lower extension of the operation lever and the rib or in the vicinity thereof. A connecting link is provided, and an outer flap having a rear end pivotally attached to the other end of the connecting link is superposed on the lower side of the inner flap in a horizontal state of the inner flap and obliquely upward of the inner flap. It is characterized in that the middle portion of the outer flap is pivotally attached to the lower side of the discharge duct by a second horizontal axis so that the outer flap can be swung downward when standing upright.

Further, in the water jet propulsion device with the reverse means of the present invention, a fixed louver is provided at the bottom opening of the discharge duct to guide the flow from the inner flap forward when the inner flap is erected. It is characterized in that the outer flap is formed by being bent upward so as to cover the fixed louver from below when the bottom opening of the discharge duct is closed by each flap.

[0010]

In the above-described water jet propulsion device with the reverse means of the present invention, when the operation lever is operated forward, the inner flap and the outer flap are in a horizontal state where the inner flap and the outer flap overlap each other so as to close the bottom opening of the discharge duct. The flow from the water jet pump is injected rearward from the rear opening of the discharge duct to advance the vessel.

Further, when the operating lever is operated rearward, the inner flap rises obliquely upward and the outer flap pivots obliquely downward so that the flow introduced into the discharge duct from the water jet pump is changed to the inner flap. At the outer flap, the flow is converted downward into a flow with a forward component, so that the ship can be moved backward. At that time, the inner flap is pivotally connected to the discharge duct directly on the first horizontal horizontal axis, and the outer flap is also pivotally connected to the discharge duct directly on the second horizontal horizontal axis. The sex will be maintained.

Further, when the fixed louver is provided in the bottom opening of the discharge duct, the downward flow of the fixed louver and the lower flap is caused by the upper flap standing obliquely upward in the discharge duct when the operating lever is moved backward. Is efficiently converted into a flow having a forward component. When the operation lever is moved forward, the fixed louver is covered by the lower flap that is curved upward, so that the fixed louver does not increase the resistance.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing a water jet propulsion apparatus with reverse means as a first embodiment of the present invention, and FIG. 2 is an operation of the apparatus of FIG. FIG. 3 is a vertical sectional view showing a state, FIG. 3 is a vertical sectional view showing another working state of the apparatus of FIG. 1, and FIG. 4 is a vertical sectional view showing a water jet propulsion apparatus with reverse means as a second embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing a working state of the apparatus of FIG.
FIG. 6 is a vertical sectional view showing another operating state of the apparatus of FIG.

First, the first embodiment of the present invention will be described. As shown in FIGS. 1 to 3, a water jet from a water jet pump 1 mounted on the stern of a ship receives a water jet rearward from a rear opening 2a. Discharge duct 2 capable of injecting
However, it is provided so as to be steerable by a turning means (not shown). Then, the bottom wall of the discharge duct 2 is formed with a bottom opening 2b that serves as a passage for a water jet when the boat is moving backward.

At the rear end of the discharge duct 2, the lower end of the operating lever 3 is erected on a horizontal horizontal shaft 4, and is integrally formed so as to intersect with the lower end extension 3a of the operating lever 3. The inner flap 5 is provided below the rib 5a formed. The positional relationship between the inner flap 5 and the operating lever 3 is such that when the upper end of the operating lever 3 is operated forward with a hydraulic cylinder or the like not shown, the bottom opening 2b of the discharge duct 2 is closed by the inner flap 5. It is set to be possible. When the upper end of the operating lever 3 is operated rearward, the inner flap 5 can be sequentially raised obliquely upward as shown in FIGS. 2 and 3.

Further, a connecting link 13 having one end pivotally attached by a pin 12 is provided at or near the joint between the lower end extension 3a of the operating lever 3 and the rib 5a, and the other end of the connecting link 13 is an outer side. The rear end of the flap 7 is pivotally attached via a pin 14. The outer flap 7 is superposed on the lower side of the inner flap 5 in the horizontal state of the inner flap 5 (see FIG. 1).
In addition, when the inner flap 5 stands up obliquely upward, as shown in FIGS.
As shown in FIG. 5, the middle portion of the outer flap 7 is pivotally attached to a lower mounting bracket 2d of the discharge duct 2 by a second horizontal axis 15 so that the outer flap 7 can be swung downward.

The upper portion of the operating lever 3 can be moved along a slit formed on the upper side of the discharge duct 2, and the front edge of the operating lever 3 has an edge 3 for reducing resistance.
b is formed.

Since the water jet propulsion apparatus with the reverse traveling means of the first embodiment is constructed as described above, the upper end of the operating lever 3 is operated forward as shown in FIG. , Upper flap 5 and outer flap 7
Are the bottom openings 2 of the discharge duct 2 in a horizontal state in which they overlap each other.
b is closed. Therefore, the flow 11 introduced from the water jet pump 1 into the discharge duct 2 is directly ejected as a water jet from the rear opening 2a of the discharge duct 2.

When maneuvering the ship to the reverse state,
As shown in FIGS. 2 and 3, the operating lever 3 is sequentially operated rearward, whereby the inner flap 5 stands obliquely upward and the outer flap 7 pivots obliquely downward, so that the water jet pump 1 discharges the duct. The stream 11 introduced into 2 is deflected downwards by the inner flap 5 and is further transformed by the outer flap 7 into a stream 11 'having a forward component.

In this way, the reverse action of the ship takes place, with the inner flap 5 being pivotally attached directly to the discharge duct 2 by means of the first horizontal transverse shaft 4 and the outer flap 7 also being provided with the second flap. Since the horizontal horizontal axis 15 directly pivots to the discharge duct 2, the outer flap has a sufficient reliability in strength as compared with the conventional case in which the outer flap is pivotally supported by a floating fulcrum. It can also contribute to weight reduction.

Further, the inner flap 5 and the outer flap 7 directly overlap each other in a horizontal state in which the bottom opening 2b of the discharge duct 2 is closed, and no gap is formed between them, so that a straightening wall as in the conventional case (see FIG. 7). 2c)), which leads to a simplification of the structure.

Next, a second embodiment of the present invention will be described. As shown in FIGS. 4 to 6, in the case of the present embodiment as well, as in the first embodiment, the water jet pump mounted on the stern. A discharge duct 2 capable of receiving a water flow from 1 and injecting a water jet rearward from a rear opening 2a is provided so as to be steerable by a turning means (not shown). Then, the bottom wall of the discharge duct 2 is formed with a bottom opening 2b that serves as a passage for a water jet when the boat is moving backward.

At the rear end of the discharge duct 2, the lower end of the operating lever 3 is erected on a horizontal horizontal shaft 4, and is integrally formed so as to intersect with the lower end extension 3a of the operating lever 3. The inner flap 5 is provided below the rib 5a formed. The positional relationship between the inner flap 5 and the operating lever 3 is such that when the upper end of the operating lever 3 is operated forward with a hydraulic cylinder or the like not shown, the bottom opening 2b of the discharge duct 2 is closed by the inner flap 5. It is set to be possible. When the upper end of the operating lever 3 is operated rearward, the inner flap 5 can be sequentially raised obliquely upward as shown in FIGS. 2 and 3.

Further, a connecting link 13 whose one end is pivotally attached by a pin 12 is provided at or near the joint between the lower end extension 3a of the operating lever 3 and the rib 5a, and the other end of the connecting link 13 is outside. The rear end of the flap 7 is pivotally attached via a pin 14. The outer flap 7 is superposed on the lower side of the inner flap 5 in the horizontal state of the inner flap 5 (see FIG. 4).
Moreover, when the inner flap 5 stands up obliquely upward, as shown in FIGS.
As shown in FIG. 5, the middle portion of the outer flap 7 is pivotally attached to a lower mounting bracket 2d of the discharge duct 2 by a second horizontal axis 15 so that the outer flap 7 can be swung downward.

The upper portion of the operating lever 3 can move along a slit formed on the upper side of the discharge duct 2, and the front edge of the operating lever 3 has an edge 3 for reducing resistance.
b is formed.

Further, in the second embodiment, the discharge duct 2
A fixed louver 16 is attached to the bottom opening 2b of the above, and the fixed louver 16 guides the flow from the raised inner flap 5 forward. Further, the outer flap 7 is curved upwards 7b so as to cover the fixed louver 16 from below when the bottom opening 2b of the discharge duct 2 is closed by the inner flap 5 and the outer flap 7.
Is formed. With the above-described structure, in the case of the second embodiment as well, the same operational effects as those of the first embodiment described above are obtained, and since the fixed louver 16 is provided in the bottom opening 2b of the discharge duct 2, the backward movement operation of the operation lever is performed. At times, the downward flow due to the upper flaps 5 standing obliquely upward in the discharge duct becomes a flow 11 'having a forward component efficiently due to the cooperative action of the fixed louver 16 and the lower flaps 7. It will be converted.

When the operation lever 3 is moved forward,
Since the fixed louver 16 is covered by the lower flap 7 that is curved upward, the fixed louver 16 does not increase the resistance.

[0028]

As described in detail above, according to the water jet propulsion device with the reverse means of the present invention, the following effects can be obtained. (1) The inner flap is pivotally attached to the discharge duct directly on the first horizontal horizontal axis, and the outer flap is also pivotally attached to the discharge duct directly on the second horizontal horizontal axis. The property is maintained, and the weight of the entire device is reduced. (2) Since the inner flap and the outer flap can directly overlap each other in a horizontal state in which the bottom opening of the discharge duct is closed, it is not necessary to provide a conventional flow straightening wall at the front edge of the bottom opening. Will result in a simplification of the structure. (3) A fixed louver can be provided at the bottom opening of the discharge duct, in which case the downward flow of the downward flow due to the upper flap that rises diagonally upward in the discharge duct during backward movement of the operating lever Due to the cooperation with the side flaps, the flow is efficiently converted into a flow having a forward component. (4) When the operation lever is moved forward, the fixed louver is covered by the downwardly curved lower flap, so that the fixed louver does not increase the resistance.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a water jet propulsion device with a reverse drive unit according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing a working state of the device of FIG.

3 is a longitudinal sectional view showing another operation state of the device of FIG.

FIG. 4 is a vertical cross-sectional view showing a water jet propulsion device with a reverse device according to a second embodiment of the present invention.

5 is a vertical cross-sectional view showing an operating state of the apparatus of FIG.

6 is a longitudinal sectional view showing another operation state of the apparatus of FIG.

FIG. 7 is a vertical cross-sectional view showing an example of a conventional water jet propulsion device with a reverse drive unit.

[Explanation of symbols]

 1 Water Jet Pump 2 Discharge Duct 2a Rear End Opening 2b Bottom Opening 2d Mounting Bracket 3 Operating Lever 3a Lower End Extension 3b Edge 4 First Horizontal Horizontal Axis 5 Inner Flap 5a Rib 6,6 'Horizontal Horizontal Axis 7 Outer Flap 7b Concave curved shape 11, 11 'flow 12 pin 13 connection link 14 pin 15 2nd horizontal horizontal axis 16 fixed louver

Claims (2)

[Claims] 1. A ship is provided with a discharge duct capable of receiving a flow from a water jet pump and injecting a water jet rearward from a rear opening, and the bottom wall of the discharge duct is provided with a bottom opening. The lower end of the operation lever is pivotally attached to the rear end by the first horizontal axis, and the operation lever is provided below the rib integrally formed so as to intersect with the lower end extension of the operation lever. An inner flap capable of closing the bottom opening in a horizontal state when the lever upper end is operated forward, and a connecting link having one end pivotally attached to the joint between the lower end extension of the operation lever and the rib or in the vicinity thereof. An outer flap, which is provided and pivotally attached at the rear end to the other end of the connecting link, overlaps with the lower side of the inner flap in a horizontal state of the inner flap and raises the inner flap obliquely upward. A water jet propulsion device with a reverse drive means, wherein an intermediate portion of the outer flap is pivotally attached to a lower side of the discharge duct by a second horizontal axis so that the outer flap can be turned downward at times. 2. The water jet propulsion apparatus with reverse means according to claim 1, wherein a fixed louver is provided at a bottom opening of the discharge duct to guide the flow from the inner flap forward when the inner flap is erected. At the same time, the outer flap is formed by being bent upward so as to cover the fixed louver from below when the bottom opening of the discharge duct is closed by each of the flaps. Propulsion device.