JPH1134982A - Reverser for water jet propulsion unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reverser for a water jet propulsion unit generating no turbulence for the reversion of an injection stream with the same handle operation for forward rotation and reverse rotation. SOLUTION: The upper wall face 14b and the rear wall face 14c of a reverser 14 reversing the advance direction of a ship are formed into a curved surface, and the lower face section 14d is expanded. The angle of the side wall face 14e of the reverser 14 against the center line of a discharge casing 7 is made larger than the maximum rudder angle of a deflector, and the cross sectional shape of the reverser 14 is made a fan shape. The collision of the injected stream from the deflector with the side wall face 14e is resolved, the injected stream is reversed in the right and left opposite directions, and the operation performance at the time of reverse rotation is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversing device for a water jet propulsion device, and more particularly to a reversing device capable of easily operating a steering wheel during forward turning and backward turning.

[0002]

2. Description of the Related Art A reverser of a water jet propulsion device reverses the flow of water jetted by a deflector to make a ship retreat backward. With respect to the direction of reversal in the same direction (for example, JP-A-57-186598) and the direction of jet of water flow from the deflector,
One that reverses left and right directions (for example, Japanese Patent Application Laid-Open
1982 gazette).

[0003]

The above-mentioned conventional reverser in which the handle is turned in the same direction as the turning direction of the boat when the vehicle turns forward when turning in the same direction as the jetting direction from the deflector. However, when making a reverse turn, it is necessary to turn the steering wheel in the direction opposite to the turning direction of the boat, making it difficult to maneuver the boat and possibly turning the steering wheel incorrectly if danger avoidance is required. was there. In addition, with respect to the jet direction of the water flow in the subsequent stage,
When the deflector has a square cross-section and the steering angle of the deflector is maximum, a part of the water flow collides with the side surface of the reverser and the rest collides with the rear wall surface. The component which is disturbed and is reversed in the direction opposite to the left and right with respect to the ejection direction becomes small, and there is a possibility that the reverse turning performance may be hindered. SUMMARY OF THE INVENTION An object of the present invention is to provide a device in which the steering operation of forward turning and reverse turning is the same, and turbulence does not occur in reversal of the jet flow.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is that water is sucked into a pump casing from a suction port opened at the bottom of a ship, water is pressurized by an impeller of the pump casing, and a discharge casing provided at a stern is provided. At the rear end of the discharge port of the discharge casing, a deflector that is rotatable left and right is provided, and a reverser that selectively opens and closes the rear of the rear end opening of the deflector is disposed. In a water jet propulsion device for reversing the direction of travel of a boat, the upper wall surface and the rear wall surface of the reverser are configured to be elliptical, and the lower surface thereof is expanded,
The angle of the side wall surface of the reverser with respect to the center line of the discharge casing is made larger than the maximum steering angle of the deflector, and the cross section of the reverser has a fan shape.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is constructed as described above, and pressurized water jetted from a discharge casing allows a deflector to rotate in the direction of rotation of a handle so that a boat can turn forward. When reversing the boat, if the reverser is turned to close the front of the rear end opening of the deflector, the pressurized water jetted from the deflector is reversed along the elliptical inner peripheral surface and jetted forward below the stern. And the boat can move backward. When the deflector is turned to the right or left, the pressurized water jetted from the deflector is reversely jetted in the reverse direction by the reverser, and the boat can turn backward in the direction in which the steering wheel is turned. Also,
Both side walls of the reverser have an inclination angle in the direction away from the pressurized water jetted from the deflector with the maximum rudder angle. It is turned along and injected in the forward direction below the stern, and has good turning performance and operability.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, in FIG. 1, reference numeral 1 denotes a water jet propulsion device, which sucks water into a pump casing 4 from a suction port 3 opened to a ship bottom 2. Water is pressurized by an impeller 5 provided inside the pump casing 4, and pressurized water is jetted from a jet port 8 of a discharge casing 7 provided on a stern 6 as shown by an arrow. Reference numeral 9 is a drive shaft of the impeller 5, and reference numeral 10 is a guide blade for converting the swirling flow pressurized by the impeller 5 into a linear flow. Pins 11.11 are erected on the upper and lower outer peripheral portions of the ejection port 8 of the discharge casing 7, and as shown in FIGS.
A deflector 12 having a reduced end opening is pivotally connected to the outlet 11, and pressurizes a water flow which is jetted rearward from a discharge port 8 of the discharge casing 7 so as to be jetted rearward so that the water flow can be turned right and left. It is. Reference numeral 13 denotes the deflector 1
An operation rod connected to the upper portion of the second member 2, wherein the operation rod 13 is rotated so that the deflector 12 can be rotated left and right. Reference numeral 14 denotes a reverser provided so as to surround the deflector 12, and as shown in FIGS. 2 and 4,
The base end 14a is pivotally mounted on pins 15.15 provided on the lower side walls of the discharge casing 7, and the reverser 14a
By expanding and contracting a push-pull cable 16 connected to the deflector 12, the reverser 14 is discharged so that it can be rotated above the casing 7 and the rear end opening 12 b of the deflector 12. Reference numeral 17 denotes the discharge casing 7,
This is a support spring that is rotatably connected to the reverser 14.

The structure of the reverser 14 will be described in detail with reference to FIG. 5. The upper wall surface 14b and the rear wall surface 14c of the reverser 14 are formed in a curved shape, and the lower surface portion 14d is expanded.
When the reverser 14 is rotated to the rear of the deflector 12, the water flow jetted from the deflector 12
The stern 6 is turned upside down along the inner peripheral surface of the stern 4 and jetted obliquely downward and forward of the stern 6 to make the boat move backward. The side wall surface 14e of the reverser 14 is formed vertically and is larger than the maximum rudder angle for rotating the deflector 12 to the left and right with respect to the center line of the discharge casing 7, and as shown in FIG. The cross section has a fan shape, so that the water flow injected from the deflector 12 does not collide with the side wall surface 14e of the reverser 14 as shown by the arrow, so that the water flow is not disturbed. Then, the jet water switched to the left or right by the deflector 12 is reversed along the rear wall surface 14c of the reverser 14, and the water flow is reversed and jetted in the direction opposite to the jet direction of the deflector 12. Therefore, it is possible to perform the backward turning in the direction in which the steering wheel is turned, as in the case of the forward turning.

[0008]

According to the present invention, the upper wall and the rear wall of the reverser are curved as described above, and the angle of the fan-shaped side wall of the reverser is made larger than the maximum steering angle of the deflector. Even at the maximum time, the water flow does not collide with the side wall surface and disturb the water flow, the reverse turning performance can be maintained, and since the vehicle turns in the direction in which the steering wheel is turned, quick judgment such as danger avoidance is required Even in this case, the operability becomes easy.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional side view of a water jet propulsion device having a reverser according to the present invention.

FIG. 2 is a main part side view of a water jet propulsion device using the reverser according to the present invention.

FIG. 3 is a vertical sectional side view of a main part of the water jet propulsion device.

FIG. 4 is a cross-sectional plan view of a main part of the water jet propulsion device.

FIG. 5 is a perspective view of a reverser of the water jet propulsion device according to the present invention.

[Explanation of symbols]

 2 Ship bottom 3 Suction port 4 Pump casing 5 Impeller 6 Stern 7 Discharge casing 8 Spout 12 Deflector 14 Reverser 14b Upper wall surface 14c Rear wall surface 14d Lower surface portion 14e Side wall surface

Claims (1)

[Claims] 1. Water is sucked into a pump casing 4 from a suction port 3 opened in a ship bottom 2, pressurized by an impeller 5 of the pump casing 4, and pressurized water is discharged from a discharge port 8 of a discharge casing 7 provided on a stern 6. At the rear end of the discharge port 8 of the discharge casing 7, a deflector 12 rotatable left and right is provided, and a reverser 14 for selectively opening and closing the rear end of the rear end opening of the deflector 12 is provided. In the water jet propulsion device for reversing the traveling direction of a boat, the upper wall surface 14b and the rear wall surface 14c of the reverser 14 are formed in a curved shape, the lower surface portion 14d is expanded, and the discharge casing 7 The feature is that the angle of the side wall surface 14e of the reverser 14 with respect to the center line is larger than the maximum steering angle of the deflector 12, and the cross-sectional shape of the reverser 14 is a sector shape. Water jet propulsion device reverser.