JPH04134905U - Jet flow direction change device in a waterjet propulsion device - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention relates to a jet flow direction changing device in a water jet propulsion device. [Structure] In a water jet propulsion device, a shaft 2 is attached to the rear end of a nozzle 1 so that a pair of left and right direction deflection plates 2 and 3 can be rotated in left and right directions using hydraulic cylinders 4 and 5, respectively.
Reverse buckets 6, 7, which can change the direction of the jet flow in the direction opposite to the flow direction, are attached to each direction deflection plate 2, 3 via hydraulic cylinders 8, 9 and rotated vertically, respectively. When movably attached via the shafts 6a, 7a to generate a jet flow in the opposite direction to the main flow, the direction deflection plates 2, 3
The interference between the main flow and the jet flow in the opposite direction to the main flow is reduced by opening the back buckets 6 and 7 to the left and right so that they do not interfere with the jet flow, and then lowering the backward buckets 6 and 7, and then closing the direction deflection plate. In addition to being able to move forward, it is also characterized by a reduction in resistance when moving forward.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a jet flow direction changing device in a water jet propulsion device. do.

0002

[Conventional technology]

Generally speaking, for ships equipped with water jet propulsion, the direction of travel of the ship is The change is made by changing the direction of the jet flow of the water jet propeller. There is.

0003 A conventional jet flow direction changing device will be explained with reference to FIGS. 4 to 6. - At the rear end of nozzle 1 of the jet propulsion device, to change the direction of the jet flow from side to side. A duct 11 is rotatably mounted via a shaft 11a, and a jet stream flows through the duct 11. A nozzle 12 having a forward opening for redirection in the opposite direction is inserted into the duct. A movable direction is provided below the nozzle 11, and a movable direction is provided to guide the jet stream to the nozzle 12. A deflection plate 13 is rotatably attached above the duct 11 via a shaft 13a to direct the jet. It constitutes a flow direction changing device.

0004

[Problem that the idea aims to solve]

In general, the jet flow direction changing device in a water jet propulsion device is As a function of changing the direction of the jet flow from side to side and in the opposite direction to the flow direction, In addition, changing direction in the opposite direction to the flow direction while changing direction left and right, and and the main jet flow (thrust) and the jet flow (due to) in the opposite direction of the flow direction. It is required to maintain a balance between the

[0005] By the way, the conventional type mentioned above has a function that balances each jet stream mentioned above. , due to its structure (direction deflection plate 13 that directs the jet stream in the opposite direction to the flow direction) is installed above duct 11), the main jet flow and flow direction are However, there is a problem that the jet flow in the opposite direction interferes with the flow, making the flow unstable. Ru.

[0006] In addition, the nozzle 12 installed at the bottom of the duct 11 protrudes downward, and the hull There is also the problem that it collides with the passing flow and creates resistance.

[0007] The present invention attempts to solve these problems.

[0008]

[Means to solve the problem]

Therefore, it is necessary to change the direction of the jet flow in the water jet propulsion device of this invention. The device includes a nozzle in a water jet propulsion device, and a rear end of the nozzle. A pair of left and right directional deflection plates are attached to the upper and lower parts of the Reverse buckets are attached to each direction deflection plate so that they can rotate up and down separately. It is characterized by being

[0009]

[Effect]

Jet flow direction changing device in the water jet propulsion device of the present invention described above Now, the jet flow in the opposite direction to the main flow is generated by moving the backward bucket from left and right. Because of this, interference between each jet stream is small and water draining is stable.

0010 Also, are backward buckets installed on each of the left and right direction deflection plates? By opening the left and right direction deflection plates and raising the reverse bucket upward, the direction deflection plates This eliminates the downward protrusion and reduces resistance.

[0011]

【Example】

The following is a diagram showing a water jet propulsion device as an embodiment of the present invention. To explain the jet flow direction changing device, Figure 1 shows the schematic side when traveling straight. 2 is a schematic side view at the time of balance, and FIG. 3 is a rear front view of FIG. 2.

0012 The jet flow direction changing device in the water jet propulsion device of this example is also Attached to the water jet propeller of a water jet ship to determine the ship's navigation direction. It has the function of changing the rear end of nozzle 1 of the water jet propulsion device. A pair of left and right direction deflection plates 2 and 3 are rotatable in the left and right directions via shafts 2a and 3a, respectively. It is attached to Noh. Reference numerals 4 and 5 each rotate the direction deflection plates 2 and 3 in the left and right directions respectively. It shows the hydraulic cylinder that moves the image.

[0013] Further, behind the nozzle 1, the deflection plates 2 and 3 are connected to the vertical direction through the shafts 6a and 7a. Reverse buckets 6 and 7 are rotatably attached. In addition, the backward bucket The jets 6 and 7 are arranged behind the nozzle 1 and are used to handle the jet discharged from the nozzle 1. It has a function to change the direction of the flow forward, and uses separate hydraulic cylinders 8 and 9 to create the shape shown in Figure 1. It is configured so that it can be rotated from the state shown in FIG. 2 to the state shown in FIG.

[0014] With the above-mentioned configuration, the jet stream is deflected left and right by rotating the direction deflection plates 2 and 3 in the left and right directions. It can be turned in any direction. Also, the mainstream jet flow and the direction opposite to the mainstream The balance state with the jet flow can be adjusted by opening the deflection plates 2 and 3 to the left and right and allowing the jet flow to dry out. After making sure that they are not intersecting, lower the reverse buckets 6 and 7, and then move the The deflection plate creates a state in which the mainstream and the jet flow in the opposite direction are balanced. can be created by closing up to I can write it.

[0015] In addition, the projections below the direction deflection plate when the jet stream is sprayed backwards Regarding the resistance point, open the direction deflection plates 2 and 3 to the left and right and move the reverse buckets 6 and 7 upward. By raising it toward the side, it is possible to reduce the resistance.

[0016]

[Effect of the idea]

As detailed above, the jet flow in the water jet propulsion device of the present invention According to the direction changing device, the following effects or advantages can be obtained. (1) Changing the direction of the jet flow from side to side by rotating the direction deflection plate left and right. be able to. (2) Directing the jet flow in the opposite direction to the mainstream jet flow to the backward bucket from the left and right directions. Because it is generated by movement, there is little interference between each jet flow, and water drains easily. Set. (3) Since reverse buckets are installed on each of the left and right direction deflection plates, By opening the deflection plate and raising the reverse bucket upwards, the There is no protrusion in the direction, and the resistance can be reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of a jet flow direction changing device in a water jet propulsion device as an embodiment of the present invention when the jet flow is moving straight;

FIG. 2 is a schematic side view at the same time of balance.

FIG. 3 is a rear front view of FIG. 2;

FIG. 4 is a schematic side view of a jet flow direction changing device in a conventional water jet propulsion device.

FIG. 5 is a longitudinal sectional view of the same.

FIG. 6 is a plan view of the same.

[Explanation of symbols]

1 nozzle 2,3 direction deflection plate 2a, 3a, 6a, 7a axis 4,5,8,9 Hydraulic cylinder 6,7 Reverse bucket

Claims (1)

[Scope of utility model registration request] Claim 1: A water jet propulsion device, comprising a nozzle, a pair of left and right direction deflection plates attached to the rear end of the nozzle so as to be rotatable in the left and right directions, and a backward bucket attached to each direction deflection plate. are each individually rotatable in the vertical direction,
A device for changing the direction of jet flow in a water jet propulsion device.