JP2965051B2 - Water jet propulsion device - Google Patents

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 in which a water inlet is provided at the bottom of a ship.

[0002]

2. Description of the Related Art A water jet propulsion boat equipped with a conventional jet propulsion device is schematically shown in FIG. FIG.
The jet propulsion device mounted on the jet propulsion boat main body 60 includes a housing 54 mounted on the rear end of the jet propulsion boat main body, an impeller shaft 50 for rotation transmission disposed in the housing 54, and an impeller shaft 50. An impeller 51 is provided on the outer periphery of the boat 50, and a suction port 52 and an ejection port 57 provided on the bottom side of the stern by rotation of the impeller 51.
, The water is constantly sucked in and jetted out, whereby the propulsion force is applied to the jet propulsion boat main body 10.

[0003] For this reason, seawater or the like is sucked into the suction port 52 from around the suction port 52 in a vigorous manner. When traveling in a prosperous place, foreign objects such as stones and seaweed are sucked together with seawater which is inhaled vigorously, and the foreign objects come into contact with or become entangled with the rotating impeller 51, thereby damaging the impeller 51 or housing. There is a possibility that other abnormalities may occur inside and cause the entire water jet propulsion device to stop. Therefore, in order to prevent foreign substances from entering, the entire opening of the suction port 52 is covered with the lattice fitting 55.

FIG. 11 shows this lattice fitting 55. FIG.
In the grid metal fitting 55, an oval through hole 56 is formed at a predetermined interval along a traveling direction of the water jet propulsion boat in a rectangular plate-like member formed in accordance with an opening of a suction port (not shown). By sucking seawater through the through holes 56, foreign matters such as stones and seaweeds are prevented from entering the water jet propulsion device.

[0005]

However, in the above-described conventional water jet propulsion device, if a seaweed or the like adheres to the lattice fittings of the propulsion device during operation of the water jet propulsion boat equipped with the propulsion device, the water jet As the resistance increases, this will overload the propulsion system and affect the driving performance.Because this lattice fitting is located on the bottom of the ship where it is difficult to clean, prevent clogging at an early stage. Because the through hole of the lattice fitting is set to have a certain width, when the water jet propulsion boat travels in shallow water such as a sandy beach or a place where seaweeds etc. thrive near the sea surface, the diameter is about 40 [ mm] of stone or the like may be sucked, which may cause damage to the impeller and other parts, and may cause the entire waterjet propulsion device to stop operating.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a water jet propulsion device which can solve the disadvantages of the prior art and, in particular, can maintain stable running performance for a long period of time.

[0007]

According to the present invention, there is provided an impeller shaft for transmitting a rotational force, which is disposed toward a spout in a housing having a water inlet and a spout, and an outer end of the impeller shaft. And an impeller mounted on the section. Then, a frame is provided around the above-described suction port, thin rod-shaped members are arranged at predetermined intervals in the frame portion in parallel with the impeller axis, and one end of each of the rod-shaped members is moved in the traveling direction side. The rod is fixed to the frame, and the other end of the rod-shaped member is installed obliquely outward from the frame. This aims to achieve the above-mentioned object.

[0008]

[Function] When a water jet propulsion boat equipped with a water jet propulsion device travels in a shallow water or a place where seaweeds etc. thrive near the sea surface, relatively small stones on the seabed are sucked together with seawater toward the suction port. In this case, thin rod-shaped members are arranged at predetermined intervals in parallel with the emperor axis on the frame portion provided around the suction port, and one end of each of the rod-shaped members is defined as a frame in the traveling direction. With the rod-shaped member fixed and obliquely provided with the other end of the rod-shaped member facing outward from the frame, foreign substances such as stones and seaweed sucked together with water are eliminated, and intrusion into the housing is prevented. You.
Also, the seaweed and the like sucked together with the seawater once adhere to the rod-shaped member, and then are separated into the sea from the other end of the rod-shaped member by the water pressure generated by the propulsive force.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Here, the same components as those of the above-described conventional example will be described using the same reference numerals. FIG. 1 shows a propulsion device portion of a water jet propulsion boat equipped with the water jet propulsion device according to the present embodiment. In FIG. 1, this water jet propulsion device
Water inlet 5 provided at the bottom of the water jet propulsion boat
2 and an impeller shaft 50 for rotation transmission disposed in the housing 54 having the ejection port 57 toward the ejection port 57.
And an impeller 51 on the outer periphery of the end of the impeller shaft 50. The frame 1 is provided in the above-described suction port 52, and a plurality of grids 2 are formed in the frame 1 at predetermined intervals along the propulsion direction. The end portions of the plurality of comb-shaped bar members 3 are fixed, and the comb-shaped bar members 3 are provided at a predetermined angle.

More specifically, FIG. 2 shows a front portion of the frame 1. In FIG. 2, the frame 1 is made of rectangular aluminum and extends along the longitudinal direction of the frame 1 by 1 [m
m] to 300 [mm] are formed at intervals of aluminum. Then, a stainless steel wire 3 having a predetermined length is changed from 3 [mm] to 40 [m] from the longitudinal side surface of the lattice portion 2 toward the downstream side in the traveling direction when the frame is mounted.
m] at intervals.

FIG. 3 shows a cross section of the frame 1 in FIG. In FIG. 3, the lattice portion 2 formed along the longitudinal direction of the frame 1 is set at an angle slightly inclined in the water flow direction when the frame is mounted. The angle of attachment to the wire 3 fixed to the side surface is almost a right angle. However, the relationship between the set angle of the grid portion 2 to the frame 1 and the mounting angle between the grid portion 2 and the wire 3 is arbitrary as far as possible in design. The wire 3 is disposed such that one end is fixed to the lattice portion 2 at a predetermined acute angle with respect to the frame 1 and the other end is slightly protruded from the bottom 1A of the frame 1 to be released. Have been.

FIG. 4 shows a portion where the grid portion 2 and the wire 3 in FIG. 3 are attached. In FIG. 4, the grid portion 2 is provided with a prepared hole portion 2A which is formed at a predetermined angle so that the wire 3 can be set at a predetermined acute angle with respect to the frame body 1. One end of the wire 3 is inserted into the portion 2A, and the inserted portion is welded and fixed from both side surfaces of the frame 1 by brazing or the like.

Next, the operation of the frame 1 in the above embodiment will be described with reference to FIG. FIG. 5 shows a partial bottom view of the water jet propulsion boat. FIG.
In this case, when the water jet propulsion boat travels in a place where seaweeds and the like prosper to the shallow water and near the sea surface, relatively small stones and seaweeds on the seabed are sucked toward the inlet 52 together with the seawater. Then, in FIG.
The relatively small stone 41 described above is fixed by a plurality of wires 3 having ends fixed to the respective lattice portions of the frame 1 attached to the frame 1 and arranged along a direction in which water is jetted at a predetermined angle.
And the like are prevented from entering the housing. On the other hand, the seaweed 42 inhaled together with the seawater adheres to the wire 3 and is then moved downstream of the wire by the force of the water flow F generated when the water jet propulsion boat travels, and leaves the sea again from the downstream end 3A of the wire. It will be. Also,
Even when the seaweed 42 does not move smoothly to the downstream side of the wire and accumulates on the wire 3, the water flow pressure applied to the seaweed 42 increases in proportion to the amount of the seaweed 42 deposited. From the ocean.

Next, another embodiment will be described with reference to FIGS.
It will be described based on. FIG. 7 shows a sled-shaped auxiliary member 8 which is additionally provided to the above-described embodiment.
8 and 9, the auxiliary member 8 is provided on both sides of the frame 1 along the traveling direction of the water jet propulsion boat 60, and protects the frame 1 from the side and also has a rectifying effect. Thus, it contributes to improving the running performance of the water jet propulsion boat. Other configurations are similar to those of the above-described embodiment. In FIG. 6, the method of fixing the wire 3 and the grid portion 2 is as follows. In addition to the brazing described above, a screw portion is formed at one end of the wire 3, and the screw portion is provided on the grid portion 2. It penetrates the hole 2A and is fixed by the bolt 11. This facilitates replacement when the wire 3 is broken.

Here, in the above embodiment, the rod-shaped member fixed to the lattice portion has been described as a wire-shaped member. However, the present invention is not limited to this, and similar effects can be obtained by using a rod-shaped or thin-plate-shaped member. There is.

[0016]

Since the present invention is constructed and functions as described above, according to the present invention, a frame is provided around the suction port, and the interval between the rod-shaped members is determined by the rod-shaped members mounted on the frame. By setting the width, even when foreign substances such as relatively small stones on the sea floor are sucked toward the suction port together with seawater when traveling on shallows such as a sandy beach, penetration of these foreign substances into the housing is effective. Is regulated. Further, even when seaweed or the like adheres and accumulates on the rod-shaped member, the seaweed or the like is moved downstream of the rod-shaped member by the water flow pressure around the boat generated by the propulsion force and the action of the rod-shaped member, and the open end of the rod-shaped member is released. Has the effect of effectively preventing clogging of the suction port by being released into seawater. by this,
Provided is an unprecedented superior water jet propulsion device that can maintain stable running performance for a long period of time because the suction resistance of water to the water jet propulsion device is reduced and the entry of foreign matter is effectively restricted. be able to.

[Brief description of the drawings]

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

FIG. 2 is a front view showing a frame body in FIG. 1;

FIG. 3 is a sectional view of the frame body taken along line XX in FIG. 2;

FIG. 4 is a partial view showing a wire fixing portion in FIG. 3;

FIG. 5 is an explanatory diagram showing the operation in FIG. 1;

FIG. 6 is a partial view showing a wire fixing portion according to another embodiment.

7 to 9 are explanatory views showing another embodiment.

FIG. 10 is an explanatory view showing an outline of a main body of a water jet propulsion boat equipped with a conventional jet propulsion device.

FIG. 11 is an explanatory view showing a lattice fitting in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 Grid part 3 Wire as a rod-shaped member 50 Impeller shaft 51 Impeller 52 Suction port 54 Housing 57 Spout

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B63H 11/01 B63H 11/08 B63H 11/103 B63B 35/73 F04D 29/70

Claims (3)

(57) [Claims] 1. An impeller shaft for transmitting a rotational force, which is disposed toward a jet port in a housing having a water suction port and a jet port, and an impeller mounted on an outer end portion of the impeller shaft. A water jet propulsion device that obtains propulsion by sucking and ejecting water from the suction port and the ejection port by rotation of the impeller, and providing a frame around the suction port; Thin rod-shaped members are arranged at predetermined intervals in parallel to the axis, and the traveling direction side, which is one end of each rod-shaped member, is fixed to the frame, and the other end of the rod-shaped member is moved outward from the frame. A water jet propulsion device characterized by being installed diagonally toward. 2. An impeller shaft for transmitting a rotational force, which is disposed toward a jet port in a housing having a water intake port and a jet port, and an impeller mounted on an outer end of the impeller shaft. A water jet propulsion device that obtains propulsion by sucking and ejecting water from the suction port and the ejection port by rotation of the impeller, and providing a frame around the suction port; Thin rod-shaped members are arranged at predetermined intervals in parallel to the axis, and the traveling direction side, which is one end of each rod-shaped member, is fixed to the frame, and the other end of the rod-shaped member is moved outward from the frame. A water jet propulsion device, wherein the water jet propulsion device is provided with an auxiliary member that is set obliquely toward the vehicle and protrudes perpendicularly to the suction port from both sides of the frame body along the traveling direction. 3. The water jet propulsion device according to claim 1, wherein the rod-shaped member is formed of a hard wire.