JPH0321587A - Water jet type propulsive machine - Google Patents

Abstract

PURPOSE:To enhance the steering efficiency by providing a duct at the outlet from a nozzle of a water jet propulsive machine in such a way as capable of swinging the head to the left and right, furnishing a main jet at the tail of this duct, furnishing aux. jets in the left and right side walls of the duct, and installing a rotatable guide plate at each aux. jet. CONSTITUTION:In a water jet propulsive machine, the water taken in from a water intake 22 furnished at the bottom of a vessel 21 through rotation of a pump impeller 25 in a pump casing 23 caused by an engine is baffled by a diffuser 26 and jetted out of a nozzle 27, and a duct 32 capable of swinging its head to the left and right with a pin 31 as fulcrum is provided at the tail of this nozzle 27. A main jet 33 is provided at the tail of this duct 32 while aux. jets 34, 35 are provided in the left and right side walls. At these aux. jets 34, 35, guide plated 38, 39 rotatable round vertical rotary shafts, 36, 37 are installed in their positions on the inner side wall of the duct 32, respectively, and rotated through pins 42, 43 interlocked with the head swinging motion of the duct 32.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a waterjet propulsion device installed in a high-speed watercraft, etc., and particularly relates to a waterjet propulsion device with an improved steering mechanism.

(Prior Art) As shown in FIG. 9, a water jet propulsion device generally includes a water guide duct 4 that guides water taken in from a water intake 2 provided at the bottom of a watercraft 1 into a pump casing 3, and a pump casing. a pump impeller 5 rotatably driven by a drive shaft 5a inside the pump casing 3; a differential user 6 provided on the outlet side of the pump casing 3; and the injection nozzle 9 provided on the secondary side of the differential user 6 are shown on the right.

Then, the water flow a introduced from the water intake 2 is introduced into the water guiding duct]・
4 and is guided to the pump casing 3. The guided water stream a is pressurized by a pump vane Tti5, and after being rectified by a guide vane 8 of a diffuser 6, the pressurized water is injected as a high-velocity water stream b from an injection nozzle 9 provided at the stern. The watercraft 1 gains thrust from the reaction of this water jet.

Incidentally, the water jet propulsion device is provided with a steering mechanism at the outlet of the nozzle 9 for changing the direction of movement of the watercraft. No. 10 shows a conventional example of this steering mechanism.
A duct 11 is provided at the outlet of the nozzle 9 via @10 so as to be swingable left and right, and the ducts 1 and 11 can be swing-operated by a lever 12 for manual or automatic operation. Then, due to the left and right swing of the duct 11,
The water flow jetted from the nozzle 9 is deflected to the left and right, giving a moment of 1.0 cm around the center of gravity of the boat, thereby changing the direction of travel of the boat.

Further, FIG. 11 shows another conventional example of the steering mechanism, in which a guide valve 13 for switching the jetting direction of the water stream to the left and right is provided in the flow path 9a at the outlet of the nozzle 9, and the angle of the guide valve 13 is adjusted. It is changed by the operation lever 14, thereby deflecting the jet water flow to the left and right.

(Problems to be Solved by the Invention) In the conventional steering mechanism of the water jet propulsion machine shown in FIG.
Since it deflects the entire water stream jetted from the nozzle 9, it is essential for ships. ! ! ! In order to obtain the total rudder angle, it is necessary to tilt the duct 11 with respect to the nozzle so that the deflection angle of the jetted water flow is equal to or greater than the total rudder angle. Therefore, when it is desired to increase the deflection angle of the jet water stream, there is a problem in that the rotation mechanism such as the attachment portion between the nozzle 9 and the ducts 1 to 11, and the M4 structure such as the water leakage prevention mechanism are complicated.

Further, as shown in FIG. 11, a nozzle 9 is used as a steering mechanism.
The configuration in which the guide valve 13 is provided in the flow path 9a at the outlet part is relatively simple, but since the guide valve 13 is always present in the flow path 13, the hydraulic power loss is large, especially when traveling straight. A decrease in propulsion efficiency is unavoidable.

The present invention has been made in view of the above circumstances, and it is possible to greatly change the traveling angle of a watercraft even with a small operation angle, has good propulsion efficiency, and has a relatively simple configuration of the steering mechanism. The purpose is to provide water jet propulsion machines.

[Structure of the invention]

(Means for Solving the Problems) The present invention introduces water into a pump casing from a water intake provided at the bottom of the ship, pressurizes the introduced water with a pump impeller inside the pump casing, and installs it at the stern of the ship. A water jet propulsion device that controls jet air from a nozzle, which is provided with a duct as a steering mechanism at the outlet of the nozzle, which communicates with the nozzle and can swing from side to side. A main injection port is provided, and an auxiliary injection port is provided on the left and right side walls, and part or all of the water jet is deflected to the side at an angle different from the jet split direction from the main injection port to each of the auxiliary injection ports. It is characterized by being provided with a guide plate that can be rotated and can be used for spraying.

(Function) According to the present invention, it is possible to steer the boat by rotating the entire duct to the left and right and changing the direction of water jet from the main jet port of the duct rear pant. It is also possible to eject part or all of the water stream from the auxiliary water spout provided at the main injection port at an angle greater than or equal to the water ejection angle from the main injection port. Therefore, the water flow is at the swing angle of the duct T! Since the jet can be directed at a deflection angle of one or more, that is, the angle between the nozzle center axis and the guide plate, the jetted water flow has a deflection angle that is greater than the swing angle of the duct, and the steering efficiency can be improved.

In addition, the configuration is relatively simple, and the loss of water flow is small and the propulsion efficiency is good.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 8.

FIG. 1 is an overall sectional view of the water jet propulsion device, FIG. 2 is a plan view of essential parts, FIG. 3 is a front view, and FIGS. 4 to 8 are sectional views showing operating states.

As shown in FIG. 1, the water jet propulsion device of this embodiment has water guide ducts 1 and 2 that guide water taken in from a water intake 22 provided at the bottom of a watercraft 21 into a pump casing 23.
4, a pump impeller 25 disposed inside the pump casing 23, and a diffuser 1a 26 connected to the secondary side of the pump casing 23. Diff user 26
A guide vane 28 and a twenty-one dollar 29 are provided for rectifying the pressurized water flow and guiding it to the injection nozzle 27.

In addition, as shown in FIGS. 2 and 3, a pair of upper and lower support arms 30 are provided rearwardly projecting from the rear end of the nozzle 27, and vertical bins 31 provided on each support arm 30 are provided. As a fulcrum, the duct 3 communicates with the rear end of the nozzle 27.
2 is supported so that it can swing left and right. A drive rod of an actuator 32a is connected to the left and right sides of the duct 32, and the actuator 32a applies a swing driving force in the left and right direction to the duct 32, and the bin 31
The duct 32 is rotated, that is, oscillated from side to side, using the point as a fulcrum.

By the way, a main injection port 33 is provided at the rear end of the duct 32, and auxiliary injection ports 34 and 35 are provided on the left and right side walls, respectively. Then, located at the auxiliary injection ports 34 and 35, guide plates 38 and 39 are installed inside the side wall of the duct 32 via vertical rotation @ 36 and 37, and guide plates 38 and 39 are installed on the left and right sides of the rotating wheels 36 and 37, respectively. It is rotatably provided. Each of these guide plates 38 and 39 is connected to each auxiliary injection port 3.
4 and 35 are opened and closed, part or all of the water flow in the ducts 1 and 32 is cut off and diverted, and the biased flow can be ejected from each of the auxiliary injection ports 34 and 35. That is, each rotating shaft 36, 3 protrudes upward and downward from the duct 32.
Movable arms 40 and 41 are each integrally provided on the pant portion of 7. Slit grooves 40a and 41a that are inclined left and right in plan view are formed in each of the movable arms 40 and 41, respectively. Bins 42 and 43 attached to the rear end are slidably engaged with each other.

Next, the action will be explained.

Water Rc introduced from the water intake port 22 passes through the water guide duct 24 and is guided to the pump casing 23.

The guided water flow C is pressurized by the pump impeller 25. After the pressurized water is rectified by the guide vanes 28 of the diffuser 26, it is injected from a nozzle 27 provided at the stern. The watercraft 21 moves forward due to the reaction of this water jet.

In order to change the direction of travel of the boat, it is necessary to deflect the direction of jet 1 and water flow d emitted from the nozzle 27.

4 to 8 show in detail the steering action by the deflection of the jet water stream d.

When traveling straight, the duct 32 may be arranged along the axial direction of the hull, as shown in FIG.

When making left and right turns, the actuator 32a can be used to swing the ducts 1 and 32 left and right as in the conventional case, but in this embodiment, the action of the guide plates 38 and 39 allows the ducts j to It is possible to obtain a steering force greater than 32 degrees.

That is, when the watercraft 21 turns left, as shown in FIG.
The duct 32 swings clockwise around the bottle 31 as a fulcrum. At this time, the bottle 42 provided on the support arm 30 which is integrated with the end of the nozzle 27 is immovable, but the slit 1-j of the arm 40 that engages with this bottle 42 is not moved.
The arm 40 moves together with the duct 32 to relatively change the engagement position. That is, the bottle 42, which is displaced relative to the slit 40a, is in a state of sliding movement, and as a result, the arm 40I uses the point of contact with the pin 42 as the point of force application, and rotates in the chronological direction around rotation @36. Rotate. Therefore, arm 40 and rotation axis 36
The guide plate 38 integrated with the duct has an internal angle greater than the deflection angle of the duct 32, and turns in the direction to cut off the jet water flow e, and opens the auxiliary jet nozzle 34. As a result, the cut water stream f is ejected from the auxiliary nozzle 34 at a deflection angle greater than the angle formed by the center of the nozzle 27 and the guide plate 38, that is, the swing angle d of the ducts 1 and 32.

In addition, regarding the other guide plate No. 39 in the duct 1/32, the slit 4 of the arm 41 connected to this guide plate 39
Since the 1a groove is separated from the bottle 43, it does not receive any force and remains stationary with respect to the ducts 1 and 32. Therefore,
The remaining water flow q is injected from the main injection port 33.

Furthermore, when the hull turns to the right, as shown in FIG. 6, the duct 32 and the guide plates 38, 39 are deflected in the opposite direction to that when turning to the left. Since they are similar, their explanation will be omitted.

Note that the water field distribution of the jet water stream changes depending on the rotation angle of the duct 32. Figures 7 and 8 show the duct 3
2 is shown in a state where it is deflected to the left and right to the maximum extent. When the deflection angle of the duct 32 is set to the set maximum angle (θ, 〉), the jet water flow h is all directed to the guide plates 38, 39
The central axis of the nozzle 27 and the guide plate 38
It continues to be injected from the auxiliary injection port 34 in the direction of the angle (02) formed by the auxiliary injection port 34.

Here, the angle θ of the duct 32 with respect to the central axis of the nozzle 27 is
1 and the angle θ2 of each guide plate 38, 39 with respect to the central axis of the nozzle 27.
, is determined by a link mechanism consisting of the pins 42, 43 of the support arm 30 and the rotating shaft 36 force 1. FIG. 7 schematically shows the structure of the link mechanism in which the maximum angle θ, , = 60” when the maximum angle θ1 = 15°.

According to this embodiment, even if the rotation angle of the duct operated by the actuator 44 about the pin 31, that is, the swing angle is small, it is possible to largely deflect the jet water flow from the central axis direction of the nozzle 27. Therefore, the steering efficiency can be improved compared to the conventional one.

Moreover, the structure is relatively simple, and the loss of water flow is small and the propulsion efficiency is high.

(Effects of the Invention) As described above, according to the water jet propulsion device according to the present invention, even from the auxiliary injection port installed in the wall on the duct side,
Since we have made it possible to eject part or all of the water stream at an angle that is greater than the water jet angle from the main injection port, the water stream can be ejected at a deflection angle that is greater than the swing angle of the duct! This makes it easier to shoot the target and improves steering efficiency. In addition, the configuration is relatively simple, and the loss of water flow is small and the propulsion efficiency is good.

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view showing an embodiment of a water jet propulsion device according to the present invention, FIG. 2 is a plan view of the main parts, and FIG.
Front view, Figure 4 is a cross-sectional view showing the operation when going straight, Figure 5 is a cross-sectional view showing the operating state when turning left, and Figure 6 is a cross-sectional view showing the operating state when turning right. Figure 7 is a cross-sectional view showing the operating state at maximum left turn, Figure 8 is a cross-sectional view showing the operating state at maximum right turn, and Figure 9 is an overall view of a conventional water jet propulsion machine. 10 is a cross-sectional view showing a conventional steering mechanism, and FIG. 11 is a different conventional steering mechanism.
! FIG. 3 is a sectional view showing the structure. 22... Water intake, 23... Pump casing, 25
Pump impeller, 27 Nozzle, 32 Duct, 33 Main injection port, 34.35 Auxiliary injection port, 38.39 Guide plate. １１ fig.

Claims (1)

[Claims] A water jet propulsion machine that introduces water into a pump casing from a water intake port provided at the bottom of the ship, pressurizes the introduced water using a pump impeller within the pump casing, and injects the water from a nozzle provided at the stern, A duct is provided at the outlet of the nozzle as a steering mechanism, communicating with the nozzle and capable of swinging from side to side, with a main injection port at the rear end of the duct and an auxiliary injection port on the left and right side walls, respectively. In addition, a rotatable guide plate is provided at each of the auxiliary injection ports to deflect and spray part or all of the water jet to the side at an angle different from the injection direction from the main injection port. Characteristic water jet propulsion machine.