JPS60213599A - Simple type jet propelling device - Google Patents

Abstract

PURPOSE:To simplify the structure of a jet propelling device, by incorporating guide vanes, a main nozzle, a retro jet port, and a relief port in an impeller duct. CONSTITUTION:A shaft 3 is laid through a stern tube 1 which is extended through a tunnel-like section below the ship bottom, and an impeller 5 is secured to the shaft 3 through the intermediary of struts 19. The end shaft 22 of the impeller is fitted in a cock-board bearing 6 for guide vanes 7 incorporated in an impeller duct 4, and the impeller 5 is fitted in the duct 4. A rubber chamber 20 in the rear of a main nozzle 9 is disposed therein with an L-like rudder plate 12, so that due to the opening and closing operation of the L-like rudder plate 12 and the equilibrium between jet streams from a retro jet port 16 and a relief port 17, the forward and backward movements, neutral stop and turn of the ship may be effected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a simple water jet propulsion device for a small boat that is installed under the bottom of a ship.

The purpose is to provide a structure that has a simple structure, simplifies the operating mechanism, and facilitates maintenance. Conventional water jet propulsion devices generally drive an impeller installed in a duct with an engine inside the ship, suck seawater through a suction port opened at the bottom of the ship, accelerate it with the impeller, and jet it backwards. This device is designed to obtain propulsion force, and the device is constructed by passing a casing bearing through the impeller duct, passing a shaft driven by the engine, fixing the impeller to the shaft, and supporting it by the casing bearing and the fixed guide vane bearing. Ru. It has a structure in which a men's nozzle is installed at the rear of the guide vane, and a steering nozzle is installed at the rear of a part of the venturi.The steering nozzle is attached so as to be rotatable in the horizontal direction, and the water jetted from the impeller duct is passed through the steering nozzle. A forward thrust is obtained by jetting the water backward from the rear end of the steering nozzle.9 By operating the steering nozzle, the direction of the ship can be controlled. During reverse operation, the steering mechanism and another operating mechanism are used to shield the jet stream by a butterfly valve or a shielding plate that blocks the jet stream at the rear part of the venturi. The reverse nozzle installed at the rear of the venturi is used to send a reverse jet to move backward, or the rear end of the steering nozzle can be freely opened and closed by a forward/reverse switching packet. By blocking the rear end of the steering nozzle, the forward/reverse switching packet causes the jet to flow in the opposite direction, producing a reverse action.

Therefore, the structure and operation mechanism are complicated and maintenance is difficult. The present invention includes a drive shaft (3) and an impeller (5).
is installed under the tunnel-shaped bottom of the ship, and inside the integrated impeller duct (4), the guide vanes (kamen nozzle (9) and the front chamber (
20) Install the front chamber (2111K L-type rudder plate (12)
,! : Reverse injection n H) Relief port (17) is opened, and the impeller (5) and duct (A) can be easily removed for easy maintenance.
(0 and neutral relief (~El (+7)) and by installing the L-shaped rudder plate (12), it is possible to switch forward and backward and control the direction just by operating the non-driver. Since a neutral stop is possible depending on the orientation of the 121, the operation mechanism is simplified, the structure is extremely simple, and a simple water jet propulsion device is provided that is inexpensive and easy to operate. , pass the stun tube (1) under the bottom of the ship, pass the shirt l-(31) through the stun tube (1), and attach the strut l- to the shaft (3).
The impeller (5) is fixed via the impeller (1!l), and the impeller end shaft (2) is fitted into the cockboard bearing (6) of the guide vane (7) installed inside the impeller duct (4). In a simple water jet propulsion device in which an impeller (5) is attached to a duct (4), a men nozzle (9), a rear front chamber (2)
Attach an L-shaped rudder plate circle to the L-shaped rudder plate (121) and adjust the balance between the opening and closing operation of the L-shaped rudder plate (121) and the jet flow from the reverse injection port (16) and the relief port OD. It is characterized by being able to turn.

Embodiments of the present invention will be described below with reference to the drawings. In FIG.
The rear end shaft (22) of the fixed impeller (5) is fixed to the shaft (3) through the stun tube (1).
1 is supported on the cockboard bearing (6) of the guide vane (7). The impeller duct (4) of the main body has a guide vane (camen nozzle (9)) reverse injection port 00 relief port aη, and the front chamber (A) is equipped with an L-shaped rudder plate (121).
Cut the shaped rudder plate (12) (the upper side is the rudder shaft) (11) into the rudder plate and secure it with an insertion pin. The lower shaft α-shaft is welded to the rudder plate (1) or made integrally with the rudder plate (1). The L-shaped rudder plate Q3 is supported and rotatably mounted using zero lower rudder shaft support brackets. The operation of the rudder plate zero is in the rudder quadrant (
10) Operate with a rope using the bow handle (not shown).

The impeller (5) is supported via the shaft by the cockboard bearing (6) and the stern tube (1) bearing in the impeller duct (4).
5) - In order to keep the gap constant and prevent vibration, the duct retaining bracket) (81, (18) is fixed to the bottom of the ship with bolts. Figure 2 is a plan view of the main part of the device according to the present invention. The impeller (5) in the impeller duct (4), the guide vane (force bearing (6), the bottom bracket I- (+81) and the transom mounting bracket (8) are shown, the reverse injection port (10) and the men nozzle (9) are shown. ) and the opening/closing operation position of the steering plate θ.The rear end venturi part (2I) of the men nozzle (9) is
The reason for providing a round opposing wall (24) along the rotation line of 121 is the rudder plate (if 121 is in the C1t position, it will receive the jet stream as it is on one side and act as a deflector, so it is not suitable for the C and t positions. When the jet stream rotates further toward the duct, the jet flow reaches the rudder plate (12
1 to the rear of the operating surface to reduce the effectiveness of the rudder operation.

The present invention is provided to prevent the intrusion of the jet flow, and is designed to receive the jet flow on the operating surface and perform the forward action effectively no matter where the steering plate is located. This is one of the features of the present invention. Figure 6 shows the rudder plate (121 and rudder shaft) (Ill, (+41), and the lower part of the rudder plate (13 is bent in an R shape to form an L-shaped shielding plate (13). The operation is shown in Fig. 4.The jet stream A, which is fixed in the duct (4), passes through the inner blade (force), passes through the men nozzle (9), and is throttled by the venturi part (21). , L-type rudder plate (1
When 21 is in a shielding state, it hits the rudder plate (12), reverses, and flows out from the reverse injection port (16) to become jet stream A.
Go backwards. ■ When the "" type shielding plate (13) is bent outward, the jet stream B passes through the escape port (+7) and the jet stream B
becomes.

When the thrusts of jet streams A and B are balanced, a neutral stop occurs. FIG. 5 is a longitudinal sectional view of the second embodiment of the device according to the present invention. In the first embodiment, the strut opening is not taken out, but in the second embodiment, the strut a wing is installed in the tunnel-shaped bottom of the ship. will be established. When the strut supporting the drive shaft (3) of the impeller (5) (1,!Jl) is installed, the bearing (6) in the duct (4) and the impeller end shirt I-(
Even if 23 is not provided, the bearing of the stan tube (1) and
The impeller (5) is supported by a bearing on the strut (+9).
does not shake even when rotated by the engine. When the bearing (6) in the duct (4) is provided and fitted with the shaft (3), the duct (4) can be kept attached even if the duct mounting bracket (8) is removed. FIG. 6 is a diagram showing the main body of the impeller duct (4) and the driving portion of the shaft (3) in the second embodiment shown in FIG. 5 in a separated state. FIG. 7 is a rear schematic view of the device according to the present invention, in which the impeller duct (4) is cylindrical and the front chamber (2
tl) is a rectangular cylindrical tube. These are not separate pieces, but have an integrated structure, with an L-shaped steering plate (one piece) mounted inside a rectangular cylindrical tube, which performs steering action, reverse movement, and neutral stopping action.The operating mechanism of the present invention The operation will be explained according to FIG.

When the impeller (5) rotates, the force passes through the guide vane (9) and is throttled by the rear venturi part (21) of the men nozzle (9) to become a jet stream (9), which enters the front chamber (20) and enters the L-shaped rudder plate ( 1
When 21 is in position a, the jet stream is blocked by an L-shaped shielding plate (1
The jet stream is blocked by □□□, and the jet stream flows to the reverse injection port (1 (i) and has a backward action. When it reaches position b, the 1-shaped rudder plate (12) is slightly opened and the jet stream is directed to the left side. The bow is deflected to the left, making a small turn.When the boat reaches position C, it swings the bow to the left and turns while moving forward.When it reaches position d, it immediately goes straight.When it reaches position t, it moves forward. While moving forward, swing the bow to the right and make 9 turns.When you reach position f, the right side will be slightly opened, so the jet stream will be deflected to the right, so swing the bow to the right and make a small turn.At position g. The right side and the jet flow are the reverse injection port (16) and the escape port (17).
It jets out on both days, balances the thrust and comes to a neutral stop. When stopped in neutral, the engine is used at low speed.

As described in detail above, the present invention provides a strut (1! Fix the end of the impeller (5) (
221 and the cockboard bearing in the impeller duct (4) (
6), or remove the end shaft (221) of the impeller (5) and the bearing (6) in the duct (4) and install it in the impeller duct (4). It also makes it easier to replace bearings and clean the inside of the casing.

Since the guide vane (7), the men nozzle (9), the reverse injection port (16), and the relief port aη are provided inside the integrated impeller duct (4), the structure is simple, inexpensive, and easy to manufacture. By installing an L-shaped rudder plate (121) in the front chamber (20), and opening a reverse injection port (16) and a relief port 07 at the rear of the lower part of the venturi part 00, it is possible to use only the operating handle on the bow. L
The operating mechanism is simplified because the rotation of the type rudder plate (1219-) allows forward and backward movement, neutral stopping, turning, etc.IJ type rudder plate (+21
By providing an opposing wall (24) along the rotation line,
The effect of the rudder action is increased because it prevents the jet flow acting on one rudder plate from invading the back surface.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of the device according to the invention. FIG. 2 is a plan view of the main parts of the device according to the present invention and an explanatory diagram of the operation of the rudder plate. FIG. 3 is a perspective view of essential parts of the device according to the present invention. FIG. 4 is a longitudinal sectional view of the main part of the device according to the present invention and an explanatory diagram of the action of the jet flow. 5 and 6 are longitudinal sectional views showing a second embodiment of the device according to the present invention. FIG. 7 is a rear view of the device according to the invention, and is a schematic installation diagram. (1) Stun tube (4) Impeller duct (5) Impeller (6) Guide vane bearing (9) Men nozzle (10)
Rudder quadrant (121IJ type rudder plate (lω Rudder lower bearing bracket 10- (1G) Reverse injection port 0η Relief port (19) Strut (20) Front chamber (square tubular) (2]) Venturi (22
1 Impeller end shaft (24) Opposing wall Patent applicant
Hikaru Kobayashi

Claims (1)

[Claims] A fixed guide vane (7) and a men nozzle (9) are provided in the integrated impeller duct (4), and a part of the venturi (2
1) At the bottom, a reverse injection port (16) for reverse and a relief port αD for neutral are opened, and the venturi part Cυ rear wheelhouse (A) is installed.
Inside the L-shaped rudder plate (121), the upper and lower front shafts (11), α
It is a rotatable device with a as a pivot, and a strut (L
Fasten the two and pass the impeller shaft (3) through the bottom of the ship (
2), and the impeller (5) is fixed to the shaft (3). The end shaft (22) of the fixed impeller (5) is fitted into the cockboard bearing (1e) of the guide vane (7) fixed in the impeller duct (4), and the impeller duct (4) is attached to the bottom of the ship.
In a simple water jet propulsion system that is fixed with bolts, the rudder plate (lower mounting bracket) (18)
12) is bent to form an L-shaped shielding plate α3), and the outlet of the jet stream of the venturi part (2I) is bent to form a T-shaped rudder plate (12).
Along the + rotation line, a round opposing wall (24) is installed (partially called a venturi), the rear front chamber is made into a square tube shape, and an L-shaped rudder plate (12) is installed.
1. A simple water jet propulsion device characterized by having: