JPH08127392A - Intake bar structure in water jet - Google Patents

Abstract

PURPOSE: To provide an intake bar structure in a water jet capable of preventing as far as possible decreasing jet driving force and infiltrating foreign matter of causing various troubles. CONSTITUTION: In a stern part of a hull 22 mounting a jet main unit 11 of a water jet 10, a mounting hole 24 for receiving the jet main unit 11 is formed, also to set up, in a lower part of this mounting hole 24, the second intake bar 17 formed of a plurality of guide plates 27 with a narrow space as compared with the first intake bar 16 formed of a plurality of guide plates 21 mounted in a lower part of the jet main unit 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake bar structure for a water jet.

[0002]

2. Description of the Related Art In recent years, as the demand for high-speed boats has increased, a water jet 1 using a mixed flow / axial flow pump as shown in FIG. 4 has been actively used for water traffic and the like.

The water jet 1 is attached to the rearmost part of the hull 2 with approximately half of the main body protruding, and an intake 4 is formed on the lower surface of the jet main body 3. In this intake 4, as schematically shown in FIG. 5, elongated water absorption holes 5 elongated in one direction are continuously formed, and the water absorption holes 5 and 5 adjacent to each other are formed. In between, guide plates 6 and 6 are provided upright at predetermined intervals.

Further, the jet main body 3 is provided with a reverse bucket 8 which moves up and down by the expansion and contraction of the hydraulic cylinder 7. The reverse bucket 8 is moved to the upper position as shown by the solid line in the figure to make the hull hull. 2 moves forward, and the hull 2 moves backward by taking the lower position as shown by the broken line in the figure.

In such a water jet 1 as described above, the lower water is sucked from the water suction hole 5 of the intake 4, and
The water flow is supplied to an impeller (not shown) called an impeller built in the jet main body 3, and the water flow accelerated by this impeller is further vigorously discharged from the jet port 9 at the rear to efficiently and maximize the maximum jet. We are able to generate propulsion.

[0006]

By the way, in such a water jet 1, since water is vigorously sucked in through the water intake holes 5 of the intake 4, for example, when approaching a coastal area where seagrass or the like is flourishing, twigs, plastics, When traveling in the scattered water region, there is a possibility that these foreign substances will be sucked together with the water and the water absorption hole 5 will be blocked.

If the water absorption holes 5 are blocked by these foreign matters, the jet propulsion force will be reduced. In view of the above circumstances, the present invention aims to provide an intake bar structure in a water jet capable of reducing jet propulsion force and preventing foreign matter from entering as much as possible causing various troubles. There is.

[0008]

In the intake bar structure for a water jet according to the present invention to achieve the above object, a jet body is housed in the stern of a hull in which the jet body of the water jet is mounted. A mounting hole is formed and at the bottom of this mounting hole,
It is characterized in that a second intake bar composed of a plurality of guide plates is installed at a narrower interval than the first intake bar composed of a plurality of guide plates attached to the lower part of the jet body.

[0009]

According to the present invention having the above-described structure, before the water is sucked into the first intake bar installed in the jet main body, the second guide plates are arranged at a narrower interval than the first intake bar.
Since water is sucked in through the intake bar, even if there is dust floating near the jet body, the invasion of the dust can be blocked in advance by the second intake bar.

Moreover, even if dust or the like intrudes over the second intake bar, the dust can be blocked by the first intake bar. further,
Even if dust or the like stays near the first intake bar beyond the second intake bar, the dust is guided by the guide plate of the second intake bar when the drive of the jet main body is stopped, and the hull is hulled. Can be naturally discharged to the rear side of.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An intake bar structure in a water jet according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a mounting structure of a water jet adopting an intake bar structure according to an embodiment of the present invention. The jet main body 11 of the water jet 10 is composed of an intake block 13 having a long hole-shaped water absorption hole 12 formed on the lower surface, and an impeller race block 15 to which a vertically moving reverse bucket 14 is attached.

The lower surface of the intake block 13 is formed so that the edge of the opening extends slightly outward, and the opening plate portion 19 formed here has a plurality of guide plates as shown in an enlarged view in FIG. 21 are fixed at predetermined intervals. These guide plates 21 are made of stainless steel, aluminum, iron or the like, and have chamfered tips, and the opening plate 1 is welded.
It is fixed to 9. The guide plates 21 arranged at the predetermined intervals form the first intake bar 16. In addition, the above-described elongated water absorption holes 12 are formed at predetermined intervals between the guide plates 21, 21 forming the first intake bar 16.

On the other hand, a flat box body 23 is provided at the stern part of the hull 22 on which such a water jet 10 is mounted.
Is installed. The box body 23 serves as a mounting base for the water jet 10, and a rear portion of the box body 23 gently projects to ensure a predetermined depth. Further, an opening 24 is formed in the projecting portion, and this opening 24 constitutes a mounting hole for housing the lower portion of the jet body 11. Further, around the opening edge of the opening 24,
A large number of bolt insertion holes are formed.

As shown in FIG. 3, a plurality of guide plates 27 are fixed to the bottom surface 23a of the box body 23 at predetermined intervals narrower than the guide plates 21 installed on the lower surface of the jet body 11. These guide plates 21 are made of stainless steel, aluminum,
It is made of iron or the like, and its tip is chamfered, and is fixed to the bottom surface 23a by welding. The guide plates 27 arranged at these predetermined intervals form the second intake bar 17.

Further, elongated water absorption holes 28 are formed at predetermined intervals between the guide plates 27, 27 constituting the second intake bar 17. The water absorption hole 28 communicates with the water absorption hole 12.

As shown in FIG. 1, the water jet 10 is attached to the hull 22 by accommodating the water jet 10 in the opening 24 from above the opening 24 of the box body 23 arranged at the stern of the hull 22. . Then, the jet body 11 positioned in the box body 23 and the box body 23 are detachably fixed with a large number of bolts. When mounted in this way, the lower part of the intake block 13 is immersed below the water surface.

In some cases, one water jet 10 according to the present embodiment is mounted at the center of the hull, or two water jets 10 are mounted on each side of the hull. Then, in the hull 22 in which one or two water jets 10 are mounted, the water sucked from the water suction holes 28 of the box body 23 is introduced into the water suction holes 12 of the jet body 10, and is further called an impeller. Supplied to the impeller. Then, the sucked water is accelerated by the impeller, and is further expelled vigorously from the rear ejection port 29, whereby jet propulsion force is obtained.

Here, for example, even if a foreign matter such as seaweed floats below the surface of the water and this foreign matter is caught in the flow of water sucked from the water suction holes 28, the foreign matter will firstly come to the second position.
It is excluded by the intake bar 17 of. Therefore,
Most of the dust is blocked by the second intake bar 17.

However, even if a foreign matter smaller than the interval between the second intake bars 17 passes through the second intake bar 17, and the foreign matter further approaches the vicinity of the first intake bar 16, The first intake bar 16 can prevent intrusion. As described above, in this embodiment, the second intake bar 17 can prevent the invasion of dust preliminarily.

Moreover, even if foreign matter approaches the first intake bar 16 after passing through the second intake bar 17, the foreign matter stops driving the water jet 10 to stop the flow of suction. At times, it is guided by the second intake bar 17, is actively guided to the rear side of the hull, and is naturally discharged to the outside.

In particular, when the two water jets 10 and 10 are mounted on the hull 22, when the driving of one water jet 10 is stopped or the clutch is disengaged, the other water jet 10 is Dust and the like around the jet 10 can be removed in a natural flow.

Therefore, even when the hull runs on the surface of water where seagrass and the like are growing, a large jet propulsion force can be maintained at all times. Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and various modifications can be made.

For example, in the above embodiment, the flat box body 23 is attached to the stern part of the ship body 22, but the shape of the box body 23 is not limited to the above embodiment. In short, when the water jet 10 is mounted on the hull, the jet body 11
It suffices that the second intake bar 17, which is narrower than the first intake bar 16, is arranged below the first intake bar 16 in a state where the periphery thereof is substantially closed.

[0025]

As described above, according to the intake bar structure for the water jet according to the present invention, the second intake bar is provided below the first intake bar provided in the lower portion of the jet body. Since it is installed, when water is taken in as a power source, it is possible to prevent double intrusion of dust and the like. Therefore, it is possible to prevent the water absorption hole from being blocked by dust or the like, and thus a stable jet propulsion force can be maintained.

[Brief description of drawings]

FIG. 1 is a side view of a water jet attached to a hull by an intake bar structure according to an embodiment of the present invention.

FIG. 2 is a front view of a first intake bar installed on a jet body.

FIG. 3 is a front view of a second intake bar installed on the hull.

FIG. 4 is a side view of a water jet having a conventional intake bar structure.

FIG. 5 is a bottom view of the conventional water jet.

[Explanation of symbols]

 10 Water Jet 11 Jet Body 12 Water Absorption Hole 16 First Intake Bar 17 Second Intake Bar 21, 27 Guide Plate 24 Opening (Mounting Hole)

Claims (1)

[Claims] 1. A mounting hole for accommodating a jet main body is formed in a stern part of a hull in which a jet main body of a water jet is mounted, and a lower part of the mounting hole is provided.
An intake bar in a water jet, characterized in that a second intake bar composed of a plurality of guide plates is installed at a narrower interval than a first intake bar composed of a plurality of guide plates attached to the lower part of the jet body. Construction.