JP3468037B2 - Water jet propulsion device reverser - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a reverser for a water jet propulsion device, and more particularly, to a reverser which can easily operate a handle during forward turning and backward turning. 2. Description of the Related Art A reverser of a water jet propulsion device reverses a water flow jetted by a deflector to make a boat retreat, and a conventional reverser has a water jet propulsion device in a direction in which the water flow is jetted from the deflector. On the other hand, there is one in which the right and left are reversed in the same direction (for example, Japanese Patent Application Laid-Open No. 57-186598),
One that reverses left and right directions (for example, Japanese Patent Application Laid-Open
1982 gazette). [0003] In the above-mentioned conventional reversing device, in the case of reversing in the same direction as the jetting direction from the deflector, when turning forward, the handle is turned in the same direction as the turning direction of the boat. When turning backwards, it is necessary to turn the steering wheel in the direction opposite to the turning direction of the boat, so turning the steering wheel is difficult if maneuvering operation is difficult and immediate decisions such as danger avoidance are required. There was a possibility of making a mistake. In addition, with respect to the jet direction of the water flow in the subsequent stage,
When the deflector has a rectangular 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. 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, and the water is pressurized by an impeller of the pump casing and provided at the stern. A pressurized water is jetted from the discharge port of the discharge casing, and a deflector that is rotatable left and right is provided at the rear end of the discharge port of the discharge casing, and a reverser that selectively opens and closes a rear end opening of the rear end of the deflector is provided. Arranged, in a water jet propulsion device for reversing the traveling direction of a boat, the upper wall surface and the rear wall surface of the reverser are configured in an elliptical shape, and the lower surface portion 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- sectional shape of the central portion of the reverser has a fan shape. 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 turn in the direction of rotation of a handle to make a boat turn. . When the boat retreats, 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 inner peripheral surface of the elliptical shape 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,
Since both side walls of the reverser have an inclination angle in a direction away from the pressurized water jetted from the deflector with the maximum rudder angle, the water flow whose jetting direction can be switched by the rotation of the deflector does not hit the side wall of the reverser but on the rear wall. It is turned along and injected in the forward direction below the stern, and has good turning performance and operability. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. First, in FIG. 1, reference numeral 1 denotes a water jet propulsion device, and water is supplied from a suction port 3 opened to a ship bottom 2 to a pump casing 4. And pressurized water by an impeller 5 provided in a pump casing 4, and pressurized water is injected from an outlet 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 the push-pull cable 16 connected to the casing 7, the reverser 14 is discharged so as to be rotatable above the casing 7 and to the rear end opening 12b 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, and 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. According to the present invention, the upper wall surface and the rear wall surface of the reverser are curved as described above, and the angle of the fan-shaped side wall surface of the reverser is larger than the maximum steering angle of the deflector. Even when the steering angle is at the maximum, the water flow does not collide with the side wall surface and disturbs the water flow. Operability becomes easy even in the case of

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic vertical 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. [Description of Signs] 2 Ship bottom 3 Suction port 4 Pump casing 5 Impeller 6 Stern 7 Discharge casing 8 Spout port 12 Deflector 14 Reverser 14b Upper wall surface 14c Rear wall surface 14d Lower surface portion 14e Side wall surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B63H 11/11

Claims (1)

(57) [Claims 1] Water is sucked into a pump casing 4 from a suction port 3 opened to a ship bottom 2, and water is pressurized by an impeller 5 of the pump casing 4 and discharged to a stern 6 A pressurized water is jetted from the jet port 8 of the casing 7 and a deflector 12 is provided at the rear end of the jet port 8 of the discharge casing 7 so as to be rotatable left and right. In a water jet propulsion device in which a reverser 14 that opens and closes is disposed, and the traveling direction of a boat is reversed, an upper wall surface 14b and a rear wall surface 14c of the reverser 14 are formed in a curved surface, and a lower surface portion 14d is expanded. and, further, ejecting angle of the side wall surface 14e of the reverser 14 with respect to the center line of the casing 7 and greater than the maximum steering angle of the deflector 12, fan the cross-sectional shape of the reverser 14 Reverser of the water jet propulsion system that features that it has and Jo.