JPH0525359Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention forms a duct through which water flows inside the main body, rotates an impeller in the duct, and controls the direction of the jet flow to perform speed change and steering operations. This invention relates to a guard grid structure that prevents foreign matter such as dust from entering the duct in a waterjet propulsion device.

[Conventional technology]

Waterjet propulsion systems do not have as much external resistance as propeller propulsion systems, so they can achieve high speeds, can navigate in shallow waters or areas with many reefs, and have low noise and vibration. It is starting to become popular mainly for recreational boats.

By the way, the structure of this waterjet propulsion device is that a duct for water circulation is formed in the main body of the device, and water is taken in at the water intake port at the beginning of the duct, and an impeller is installed in the center. This generates a high-speed water flow inside the duct, which is ejected from the nozzle at the rear end to obtain propulsive force. Therefore, it is undesirable if dust or the like is sucked into the duct, so to prevent this, a grid-shaped filter called a guard grid has been provided at the water intake of the duct.

[The problem that the idea aims to solve]

However, these guard grids are often clogged, and each time they become clogged, a cumbersome removal operation is required. For this reason, Jikko 55-
In the 1998 issue, a sliding piece was inserted into the guard grid,
A device that moves a sliding piece to forcibly remove foreign matter is shown. However, this method has the drawbacks that there is a risk that the sliding piece may be twisted, and that the movement of the sliding piece is heavy since the foreign matter is directly removed by the sliding piece.

This invention is intended to correct these shortcomings, and the essence is to make it possible to reliably remove foreign objects with a light force.

[Means for solving the problem] In view of the above problems, this invention forms a duct through which water flows inside the main body, forcibly rotates an impeller within this duct, and controls the direction of the jet flow. In a waterjet propulsion device that performs speed change and steering operations, a guard grid that can be rotated downward around a horizontal support shaft is provided at the water intake port at the beginning of the duct, and adjacent guard grids are separated by rotating the support shaft at a certain angle. This invention provides a guard grid structure for a waterjet propulsion device that is characterized by being able to rotate at an angle.

[Effect]

By taking the above measures, since the guard grid also rotates downward when the support shaft is rotated, it is possible to separate and remove the dirt and the like that are dammed up here. At this time, since the rotation angles of adjacent guard grids are different, the effect of exclusion is further enhanced.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings. Fig. 1 is a sectional view showing the mission and duct of the waterjet propulsion device, Fig. 2 is a bottom view of the duct, and Fig. 3 shows the operation of the grid in the duct. 4 and 5 are side views and plan views of the propulsion device, FIG. 6 is a longitudinal sectional view of the propulsion device, FIG. 7 is a side sectional view of the transmission section, and FIG. 8 is the steering section. FIG.

First, an outline of the waterjet propulsion device will be explained with reference to FIGS. Each of them is equipped with an operating section 5.

The main body 1 constitutes a substantially cylindrical central component, and this part is attached to the stern of a ship 6 to which this device is to be installed. As shown in FIG. 6, a duct 7 through which water can flow is formed inside the main body 1. That is, the front lower part of the main body 1 is opened to serve as the water intake port 7a of the duct 7, and it is gradually continued to the rear and upwardly curved central part 7b, and is steered from the nozzle opening 7c at the rear end. Connect to section 4. Note that a guard grid 8 is provided at the water intake port 7a to prevent the inflow of foreign matter such as dust, but one end of this guard grid 8 is attached to a horizontal support shaft 9, and the support shaft 9 is rotated manually or automatically. The guard grid 8 is rotated downward to remove any clogged dirt.

FIG. 3 is a sectional view showing the rotating state of the guard grid 8, and the rotating angles of adjacent guard grids 8 are changed. That is, the glues in one of the adjacent groups (hereinafter referred to as group A) are fitted with the support shaft 9 with play in the direction of rotation, and the ones in the other group (hereinafter referred to as group B) are Make sure that the fit with the support shaft 9 is tight (see Figure 3 a and a). When the support shaft 9 is rotated by a certain rotation angle α in this state, the stopper piece 8a at the end of the guard grid 8 on the support shaft 9 side hits the restriction portion 1a of the main body 1, and it does not rotate any further. , the stopper piece 8b of group B is still in the regulating part 1.
It is set so that it does not hit point a (see b, b). Furthermore, when the rotation angle β is rotated (only the support shaft 9 rotates due to the backlash between the A group and the support shaft 9), the stopper piece 8b of the B group hits the restriction part 1a, Because it doesn't rotate any further (same part,
c), after all, the rotation angles of the A group and the B group can be made different.

As described above, when the support shaft 9 is rotated (swinged), the guard grid 8 is rotated downward, so that it is possible to remove dirt and the like that are clogged there. That is, since the waterjet propulsion device is moving forward, when the guard grid 8 is rotated to move the debris away from it, it will naturally separate and be removed. In this sense, changing the rotation angle of adjacent guard grids 8 will have a greater effect of separating them, and will increase the ability to remove them.

FIG. 1 is a cross-sectional view showing the inside of the mission 2. The mission 2 receives power from the main engine of the ship 6 (intermediate shaft 10) to drive an impeller 11 provided approximately at the center 7b of the duct 7. It is a transmission element. In this invention, the mission 2
is built into the main body 1, and therein a transmission mechanism 12,
In some cases, a clutch mechanism 13 is provided to transmit rotation at an appropriate number of rotations from the transmission 2 to the impeller shaft 14, which extends from the central portion 7b of the duct 7 to the impeller shaft 14 to which the impeller 11 is fixed. . Furthermore, if the transmission mechanism 12 and the clutch mechanism 13 are installed in the transmission 2 in this way, the input shaft 15 etc. can be directly connected to the intermediate shaft 10 etc. of the ship, and the deceleration or increase in speed can be transmitted to the ship 6 side. It is easy to install and has high versatility because there is no need to provide a speed change means. By the way, the transmission mechanism 12
Although this is a specific structure, a pair of gears 16 and 17 that mesh with each other may be set between the input shaft 15 and the impeller shaft 14 which is the output shaft. Note that the number of teeth of these gears 16 and 17 is changed as appropriate, so that the speed change ratio of the speed change mechanism 12 can be easily changed. Next, regarding the clutch mechanism 13, for example, a dog piece is attached to one side of the gear 17 that is fitted to the impeller shaft 14 described above.
7a, and the gear 17 and the impeller shaft 14 are loosely fitted. on the other hand,
A clutch body 18 formed with a dog piece 18a that engages with and disengages from the dog piece 17a may be spline-fitted to the impeller shaft 14 so as to be slidable on the dog piece 17a side. As a result, when the clutch body 18 is slid by the fork 19 or the like and the dog pieces 18a are fitted together, they are dynamically connected, and when they are separated, they are disconnected.

The transmission section 3 includes a steering section 4 called a bucket 20.
Changing the vertical position of the lid body, which has a half-moon cross section, for changing the direction of the high-speed water flow jetted from the spout 21 provided at the final end of the water jet, thereby changing the jetting direction (back and forth direction) of the water flow, This is where the speed adjustment is performed (see Figure 7).

The steering section rotates the two direction control plates 22 around the vertical support shaft 23 behind the nozzle section 7c, and this allows the jetting direction of the water flow in the left and right directions to be different, allowing for steering (No. 8 (see figure).

The vertical position of the bucket belt 20 of the transmission section 3 and the rotation angle of the direction control plate 22 of the steering section 4 are adjusted by the operation section 5. That is, the control rod 24 is extended upward from the front upper part of the main body 1, and the control rod 24 and the bucket 20 are connected by a bucket control rod 25, and an arm 26 connected to the direction control plate 22.
a is connected to each other by a steering control rod 27. As a result, when the control rod 25 is tilted back and forth, the vertical position of the bucket belt 20 changes, and the forward and backward movement and speed change accordingly. Further, when the control rod 27 is tilted left and right, the rotation angle of the direction control plate 22 changes, and the direction of movement to the left and right changes.
Note that arms 26b are connected to both direction control plates 22, and these arms 26b are formed by connecting rods 28, so by rotating only the arm 26a with the steering control rod 27, it is possible to move in both directions. The control plate 22 rotates by the same angle.

By the way, during the above explanation, the vertical position of the bucket 20 and the rotational position of the direction control plate 22 are
FIGS. 7 and 8 show the relationship in which the forward and backward movement, gear change, and steering are changed.

In addition, in this example, when the guard grid 8 is clogged with dirt, etc., the main body 1 is
The center part of the opening opens in a folded manner. That is, the main body part 1 is divided at a suitable location (preferably in the vicinity immediately after the impeller 11 is provided), and both the main body parts 1 on one side of the divided part are pivotally connected by a hinge pin 29. A set screw 30 (on which a set nut 31 is screwed) is rotatably installed around a pin 32 on one side of the main body 1 on the other side, and A latch 33 is provided on the first side, and by attaching and detaching the setscrew 30 and the latch 33, it can be bent in the middle to form an integral structure.

[Effect of idea]

As described above, according to this invention, by rotating the guard grid 8 downward, it is possible to separate and remove the debris and the like that are clogged there. At this time, by changing the rotation angle between the adjacent ones, the separation effect is large and the exclusion property is high.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the mission and duct of the waterjet propulsion device, Figure 2 is a bottom view of the duct, Figure 3 is a sectional view showing the operating state of the grid in the duct, and Figures 4 and 5 are the propulsion device. Fig. 6 is a longitudinal sectional view of the propulsion device;
FIG. 7 is a side sectional view of the transmission section, and FIG. 8 is a plan sectional view of the steering section. Code, 1...Main body, 7...Duct, 7a...Duct water intake, 8...Grid, 9...Support shaft,
11... Impeller.

Claims (1)

[Scope of utility model registration request] In a water jet propulsion device that forms a duct 7 through which water flows in the main body 1, forcibly rotates an impeller 11 within the duct 7, and controls the direction of the jet flow to perform speed change and steering operations, the starting end of the duct 7 A guard grid 8 that can be rotated downward around a horizontal support shaft 9 is provided at the water intake port 7a of the water intake port 7a, and by rotating the support shaft 9 at a certain angle, adjacent guard grids 8 can be rotated at different angles. Guard grid structure of waterjet propulsion device.