JP3228330B2 - Vertical water jet thruster - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The invention according to the present application is directed to a vertical die having a discharge port structure capable of increasing the generated thrust and preferably reducing the torque required when rotating the main body. It relates to a water jet propulsion device.

[0002]

2. Description of the Related Art A vertical water jet propulsion device is configured such that an intake port and a discharge port are flush with a ship bottom and does not protrude from the ship bottom. Since the draft is shallow, a sufficient depth of the propeller cannot be secured, so that it is often used for hull-shaped vessels that cannot be equipped with a normal tunnel-type thruster.
Further, since the main body can be turned in any direction of 360 °, thrust can be generated in any direction, and the marine vessel maneuverability can be improved.

A prior art of this kind is disclosed in Japanese Patent Application Laid-Open No. 6-278.
692 and JP-A-7-52882.
In these prior arts, three outlets are provided on the bottom surface of the casing, but the end face of the central outlet on the water inlet side is provided with an arcuate shape that is considered to be concentric with the water inlet. Further, the guide vane as described in the present application is not provided inside the discharge port, and no consideration is given to the horizontal direction of the discharged water stream efficiently. For this reason, a part of the water flow is expected to escape almost directly below the bottom surface of the casing.

On the other hand, the torque required to turn the casing assembly may be a turning force against the kinetic energy of the discharge fluid, a turning force due to the inertia force of the casing assembly, and the like. Furthermore, if the amount and direction of the water discharged from the two side discharge ports sandwiching the center discharge port become unbalanced, the resulting turning force occupies a large weight, and the size becomes a dominant factor of the turning torque.

In the latter prior art, it is described that the size and position of the discharge port are set so as not to generate this turning moment. A turning moment in any direction may remain. If the remaining turning moment increases, the capacity of the turning motor increases, and the hydraulic power source or power consumption increases.

[0006]

In order to solve the above-mentioned problems, a vertical water jet propulsion device according to the present invention is provided with a casing capable of turning in a horizontal plane, and a water intake provided at the center of the bottom of the casing. A mouth, an impeller provided above the water intake, a diffuser communicating with the water intake, a pressure chamber communicating with the diffuser, and a discharge port provided on a bottom surface of the casing communicating with the pressure chamber. In a vertical water jet propulsion machine,
A center discharge port and side discharge ports are provided on the left and right of the diameter line passing through the center of the water intake port.
Forming an end face of the intake side of the rectangular shape formed and center discharge port lines in the direction perpendicular to said diameter line, a plurality of discharge guide vanes in each outlet, substantially small bow the discharge guide vanes The angle of inclination is such that the jet from the outlet is parallel to the bottom of the casing as much as possible, and the jet from the outlet is discharged to the outside of the casing in the opposite direction to the water intake. It is characterized by being arranged with a corner.

[0007] This makes it possible to increase the efficiency of thrust generation by directing the jet flow from the discharge port to the horizontal direction as much as possible without escaping straight downward, and to make the jet flow from the discharge port immediately from the intake port. Efficiency of thrust generation can be improved by preventing suction.

In this case, if the suction guide vane is provided at the water intake port and the suction guide vane is disposed at an inclination angle such that water is sucked from the direction opposite to the direction of the jet flow discharged from the discharge port, The jet can be prevented from being sucked, and the thrust generation efficiency can be improved.

Further, if the inclination angle of the discharge guide vane of the side discharge port can be changed and adjusted, the magnitude of the left and right thrusts is unbalanced, thereby canceling the turning moment caused by the turning flow due to the rotation of the impeller. A moment can be generated. As a result, the capacity of the swing motor for swinging the casing can be reduced.

If the inclination angle of the guide vane at the center discharge port can be changed and adjusted, the load on the impeller can be adjusted. That is, if the opening area of the discharge port is increased, the load is reduced, and if the opening area is reduced, the load is increased.
The fine adjustment of the inclination angle facilitates the matching adjustment between the driving motor and the impeller having a constant rotation speed.

[0011]

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

FIG. 1 is a vertical sectional structural view of a vertical water jet propulsion machine, and FIG. 2 is a bottom view of a casing.

The vertical water jet propulsion unit J has a bottom 1
It is provided in. A cylindrical casing 3 of the propulsion device is fitted concentrically into a circular opening 2 formed in the bottom 1 of the hull.
Is held in. That is, the rolling bearing 20 is provided between the upper part of the shaft bearing member 14 and the annular engagement gear 19 provided at the inner end position of the upper wall 3c of the casing 3, and the entire casing 3 is rotatable toward the hull. Supported. As a result, the casing 3 is pivotably held on the base 4 fixed to the hull. A gearbox 8 is provided upright at the center of the base 4, and an input shaft 9 is supported by a bearing 10 from the lateral direction and inserted therethrough, and a pinion 11 is provided at the tip. A bevel wheel 13 provided at the upper end of the output shaft 12 meshes with the pinion gear 11 to form a bevel gear.
The output shaft 12 extends downward and extends downward by being inserted into a hollow shaft support member 14 extending below the gear box 8, and has a boss 15 formed at a lower end thereof. An impeller (impeller) 16 is provided at 15. The output shaft 12 is rotatably supported by a bearing 17 provided between the output shaft 12 and a shaft support member 14.

The casing 3 has a central wall 3a, which is conical and has a central wall 3a which falls down so as to surround the outer periphery of the shaft bearing member 14. The lower end of the central wall 3a extends to the upper end of the boss 15. Further, the central portion of the bottom surface 3e of the casing 3 rises upward from a position having a small gap with the tip of the impeller 16 to form the inner wall 3b. The inner wall 3b extends upward from the same position as the lower end of the conical center wall 3a in a trumpet shape while maintaining a certain interval between the center wall 3a and the diffuser 17. In this part of the diffuser 17, namely, the central wall 3a
A rectifying plate 18 is radially provided between the rectifying plate 18 and the upper part of the inner wall 3b.

A pinion 21a at the lower end of the shaft of a turning motor 21 provided on the base 4 is engaged with the engagement gear 19. Therefore, if the turning motor 21 is operated to rotate the pinion 21 a in a predetermined direction, the casing 3 integrated with the engaging gear 19 meshing with the pinion 21 a turns around the center of the output shaft 12. It has become. Thereby, the position of the discharge port 22 described later can be freely changed by 360 °. Further, an annular projection 5 is provided upright on the upper part of the cylindrical casing 3, and the base 4 is concentrically arranged on the outer periphery of the projection 5.
A guide ring 6 projecting downward from is engaged via a seal 7.

The circular opening surrounded by the inner wall 3b at the lower portion of the impeller 16 serves as a water intake 23.
Is connected to a diffuser 17, and the diffuser 17 communicates with a pressure chamber 24 formed between an outer wall 3d and an inner wall 3b of the casing 3. A discharge port 22 from which a jet from the pressure chamber 24 discharges to a part of the bottom wall (FIG.
Are formed). A plurality of arc-shaped discharge guide vanes 22a are formed at the discharge port 22 so that the discharge flow is ejected outward from the casing 3 in a horizontal direction as much as possible, that is, in a direction as parallel as possible to the bottom surface 3e of the casing 3. It is arranged with an inclination angle. This is because the greater the horizontal component of the discharge flow, the more efficiently a large thrust can be obtained. Since both the water intake port 23 and the discharge port 22 are located on the bottom surface 3 e of the casing 3, the suction with the inclination angle opposite to that of the discharge guide vane 22 a is prevented so that the water flow discharged from the discharge port 22 is not immediately sucked into the water intake port 23. Guide vanes 23 a are provided at the plurality of water intake ports 23. Therefore, in the configuration of the vertical water jet propulsion device J, water is drawn in from the water intake 23 by the rotation of the impeller 16 as shown by the arrow in FIG. 1, the pressure is increased by the impeller 16, and the water is discharged from the diffuser 17 to the pressure chamber 24. The pressure energy of the water in the pressure chamber 24 is converted into kinetic energy and is ejected from the discharge port 22 to obtain a desired thrust.

As shown in FIG. 2, the discharge ports 22 include a center discharge port 25 and side discharge ports 26 formed on both sides of the center discharge port 25. The center discharge port 25 is formed in a rectangular shape beyond the diameter in the tangential direction of the circular water intake port 23. The end face 25 a of the center discharge port 25 on the water intake 23 side is formed in a direction orthogonal to the diameter line O passing through the center of the circular water intake 23 . Because part of the water flow does not escape straight down, the water flow can be efficiently used as a propulsion force. When the end face is formed concentrically with the water outlet 23 as shown by the dotted virtual line 25B, a part of the water flow is straightened.
Efficiency worsens because it escapes just below . Side discharge port 26
Are formed in the same size symmetrically with respect to the diameter line O. Discharge guide vanes 22a are provided not only in the center discharge port 25 but also in the side discharge ports 26. A longitudinal section of this part is shown in FIG. This side discharge port 26
As described above, the discharge guide vane 22a provided at the bottom has an inclination angle opposite to that of the suction guide vane 23a.

As shown in FIG. 3B, this central discharge port 2
In some cases, the discharge guide vanes provided at the fifth and side discharge ports 26 are configured as variable guide vanes 22b so that the inclination angles thereof are variable. That is, the center of each variable guide vane 22b is pivotally supported so as to be rotatable, and the rod 28 of the drive cylinder 27 is attached to the upper end of each guide vane 22b.
Is connected via a connecting member 30;
By operating the drive cylinder 27 to extend and shorten the rod 28, each of the variable guide vanes 22b may have a desired inclination angle at a time.

This is because if the guide vane of the center discharge port 25 is made variable, the drive motor connected to the input shaft normally has a constant rotation speed, so that the discharge port is opened so as to match the impeller. It can also be used to adjust the degree. If the guide vanes of the side discharge ports 26 are made variable, it is possible to change the balance of the discharge flow rates from the left and right discharge ports, thereby changing the fluid force and canceling out the unbalanced turning moment. Thereby, the capacity of the swing motor can be reduced.

[0020]

According to the vertical water jet propulsion device of the present invention, the efficiency of thrust generation can be improved by directing the jet from the discharge port in a substantially horizontal direction without escaping straight downward. And thrust generation efficiency can be improved by preventing the jet from the discharge port from being immediately sucked from the water intake port.

Also, a suction guide vane is provided at the water intake,
By arranging the suction guide vane at an inclination angle such that water is sucked from a direction opposite to a jet direction discharged from the discharge port, it is possible to prevent the jet flow from the discharge port from being sucked,
Further, the thrust generation efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional structural view of a vertical water jet propulsion device.

FIG. 2 is a bottom view of a casing of the vertical water jet propulsion device.

3A is a longitudinal sectional view of a discharge port portion (fixed discharge guide vane), and FIG. 3B is a configuration diagram of a variable discharge guide vane.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 3 ... Casing 3b ... (Casing) inner wall 3e ... (Casing) bottom surface 16 ... Impeller 17 ... Diffuser 18 ... Rectifier plate 21 ... Rotating motor 22 ... Discharge port 22a ... Discharge guide vane 23 ... Water intake port 23a ... Suction guide vane 24 ... Pressure Room 25: Center outlet 26 ... Side outlet

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-7-52882 (JP, A) JP-A-8-58688 (JP, A) JP-A-5-270486 (JP, A) 138497 (JP, A) European publication 24443 (EP, A1) West German patent 423687 (DE, B)

Claims (4)

(57) [Claims] 1. A casing which can be turned in a horizontal plane, a water intake provided at the center of the bottom of the casing, an impeller provided above the water intake, a diffuser communicating with the water intake, and a diffuser. In a vertical water jet propulsion device having a pressure chamber communicating with the pressure chamber and a discharge port provided on a bottom surface of the casing communicating with the pressure chamber, a center discharge port is provided on each side of a diameter line passing through the center of the water intake port as a discharge port. And side discharge ports, and center discharge
The outlet is formed in a rectangular shape in the tangential direction of the water inlet, and the end face of the center outlet on the water inlet side is formed in a direction orthogonal to the diameter line, and a plurality of discharge guide vanes are provided for each outlet, The vane is formed in a substantially semi-arcuate shape and the jet from the discharge port has an inclination angle that is as parallel as possible to the bottom of the casing, and the jet from the discharge port faces the outside of the casing in the direction opposite to the intake port. A vertical water jet propulsion device characterized in that it is arranged with an inclination angle for discharging. 2. The vertical die according to claim 1, wherein a suction guide vane is provided in the water intake port, and the suction guide vane is disposed at an inclination angle such that water is sucked from a direction opposite to a jet flow direction discharged from the discharge port. Water jet propulsion. 3. The vertical water jet propulsion device according to claim 1, wherein the inclination angle of the discharge guide vane of the side discharge port can be changed and adjusted. 4. The vertical water jet propulsion device according to claim 3, wherein the inclination angle of the guide vane at the center discharge port can be changed and adjusted.