JPH0339358Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an icebreaker having a double-headed bow.

Traditionally, icebreakers with monohull bows have been the mainstream type of ships that navigate through ice.

However, the above-mentioned conventional icebreakers are unsuitable for commercial ships because the bottom space cannot be enlarged, resulting in low loading capacity, and the loss of displacement is large, making it impossible to make them into bulky vessels. It had drawbacks such as low propulsion performance during normal voyages.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to provide an icebreaker suitable for commercial ships and with good propulsion performance.

The present invention has a double-headed bow in which the front ridgeline of the bow slopes downward in the forward direction and its tip is located below the water surface, and the hull has a front opening provided between the two bows. A hollow passage is formed that communicates with a rear opening provided at the rear of the ship, and a nozzle that emits a jet toward the rear is provided on the inner wall of the hollow passage. The ice is crushed from below, and the crushed ice pieces flow out through a hollow channel into the wake of the ship.

Hereinafter, embodiments of the present invention shown in the accompanying drawings will be described.

FIG. 1 shows an embodiment of the present invention.

In the figure, the bow section of the enlarged hull has a double-headed bow 1, 1. The front ridgelines 11, 11 of the double bows 1, 1 are in the forward direction F of the hull.
It has a downward slope (angle θ), and its tip 12 is located below the water surface. Since the tip portion 12 is located at the bottom of the front ridge lines 11, 11,
It is also possible for the tip to be a bulb.

A front opening 20 is provided between the double-headed bows 1 and 1 at the front of the bow, and the front opening 20 connects to the rear position on both sides of the ship via hollow passages 2 and 2 in the hull that branch and extend rearward. Rear openings 22, 22 provided in
is connected to. The positions of the front opening 20 and the rear openings 22, 22 are set so as to be convenient for carrying out floating ice pieces 6 crushed from below by the front ridge lines 11, 11 of the double bows 1, 1 to the rear side of the hull. The front opening 20 is in the upper position and the rear opening 2
2 and 22 are provided at lower positions. The hollow passages 2, 2 that branch toward the rear are connected to the above-mentioned double openings 20.
A curve with low fluid resistance is formed between 22 and 22.

Furthermore, in order to improve the effect of carrying out the ice pieces, nozzles 5 are provided at appropriate positions on the inner walls of the hollow passages 2, 2 to eject fluid such as water toward the rear.

When an icebreaker like the one described above sails through icy seas,
The ice is lifted up from below by the front ridge lines 11, 11 of the double-headed bows 1, 1 and crushed, and the crushed ice pieces flow into the hollow passages 2, 2 through the front opening 20 along with seawater. It flows out of the ship through the openings 22, 22. At this time, the jet from the nozzle 5 makes the flow within the cavity passages 2, 2 smooth along the inner walls, and the ice pieces flow out effectively with low resistance.

As described above, the present invention breaks ice from below by scooping it up from below with the double-headed bow as the ship moves forward, and the ice pieces flow out to the rear of the ship through a hollow passage inside the ship. , has the following effects.

Since the bow is double-headed and the bottom of the ship is protruding, it is possible to build a large ship, allowing for a large loading space.

Ice chips are flowed overboard through a hollow channel,
The flow does not collide with the ice outside the ship, resulting in low resistance and, as a result, the ship's propulsion efficiency increases. In particular, since the nozzle is provided on the inner wall of the cavity, the effect is further improved.

It is also possible to install a valve at the tip of the bow, which reduces wave-making resistance in normal sea areas and improves propulsion efficiency in ballast conditions.

The presence of nozzles in the hollow channel is effective in pushing the crushed ice outward towards the ship's side, resulting in lower resistance during navigation.

[Brief explanation of the drawing]

Figure 1 shows the bow part of an icebreaker according to an embodiment of the present invention; Figure 1 is a side view, Figure 2 is a front view, and Figure 3 is a front view.
The figure is a plan view, and the fourth figure is a schematic perspective view. 1,1...double bow, 11,11...front ridgeline,
2...Cavity path, 20...Front opening, 22, 22...
... Rear opening, 5... Nozzle.

Claims (1)

[Scope of utility model registration request] It has a double-headed bow, with the front ridgeline of the bow pointing downward in the forward direction, and the tip of the bow being below the water surface.
Inside the hull, a cavity is formed that communicates the front opening provided between the two bows with the rear opening provided at the rear of the ship, and a nozzle that emits a jet toward the rear is provided on the inner wall of the cavity. A double-headed icebreaker with a bow.