JPS6080982A - Ship - Google Patents

Abstract

PURPOSE:To reduce resistance value and improve propulsion performance by separating a stem valve into the upper and lower parts, protruding the lower part integratedly with the main hull, moving up and down the upper part for the lower part, and setting the optimum stem valve according to the loading status. CONSTITUTION:A stem valve that is protruded ahead from the stem perpendicular is separated into the upper part 8 and the lower part 9 and the lower part is protruded integratedly with the main hull. The upper part 8 can be moved up and down for the lower part 9 by a hydraulic type driving unit 11. When this ship is navigated at fully loading draft marks 4, the upper part 8 is raised and when it is done at lightweight loading draft marks 5, the upper part 8 is made to descend and the optimum stem valve is set according to the loading status. As a result, the wave making resistance at the stem section can be reduced at both full loading and lightweight loading and the propulsion performance can be improved.

Description

[Detailed description of the invention] The present invention relates to ships.

The bow valve 2 of a conventional ship is shown in Fig. 1, a side view, and Fig. 2, ■.
-■ Cross-sectional view in the direction of arrows, Figure 3 ■-■ Cross-sectional view in the direction of arrows, Figure 4 EV
As shown in the cross-sectional view of - IV arrows and the cross-sectional view of Figure 5 It is designed to have the best propulsion performance when running.

31″! This is a bow valve with a different height from bow valve 2,
Like the bow valve 2, it protrudes forward from the bow perpendicular 6 below the load waterline 4 and is fixed to the main hull l, and is designed to have the best propulsion performance when sailing at the light load waterline 5. 7 is the hull centerline.

In such a bow valve, when the ship is sailing,
Waves are generated by the ship's hull, and these waves can be broadly divided into bow waves, side waves, and stern waves, and waveforms are formed by the mutual interference of these waves, but waves generated at the bow have a particularly large influence. Waves generated from the bow are closely related to the shape of the bow, and the waveforms formed in this way vary depending on the shape of the hull and speed, but the larger the waves, the greater the hull resistance. This causes a decrease in propulsion performance.

Therefore, for the purpose of reducing hull resistance, the shape of the bow valve is determined to reduce the waves induced by the hull, taking into account the voyage speed, the loaded draft, etc.

However, since the loading condition when a ship is sailing is not always constant, the design of the bow valve, which has a large effect on bow waves, is generally determined in accordance with the draft of the loading condition most frequently used in voyages. ing.

For example, the bow valve 2 shown in Figures 1 to 5 is designed for a fully loaded condition, and the bow valve 3 is designed for a lightly loaded condition. Therefore, as shown in the 6th speed-horsepower diagram, In the case of bow valve 2 (solid line), the propulsion performance is good in a fully loaded state, but it is poor in a lightly loaded state, while in the case of bow valve 3 (broken line), the propulsive performance is poor in a lightly loaded state. However, it shows poor results when fully loaded.As shown above, conventional bow valves are designed with emphasis on a predetermined draft for the loaded state that will be used for many voyages, Therefore, even if a bow valve that focuses on fully loaded conditions improves performance in fully loaded conditions, its performance will be lower in light loaded conditions than a bow valve designed with emphasis on light loaded conditions. There are advantages and disadvantages that cannot be avoided.

The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a ship equipped with a bow valve that minimizes hull resistance depending on the draft of the loaded state during navigation.

To this end, the present invention provides a ship equipped with an fb bow valve that protrudes forward from the bow perpendicular below the water surface at the bow, in which the bow valve is separated into an upper part and a lower part, and the lower part is integrally provided on the main hull, The above-mentioned upper part is configured to be movable in the vertical direction.

One example of the invention will be explained with reference to the drawings.
The side view showing the state in which the upper part of the bow valve has moved to the upper limit position, Figures 8 and 9 are vm-vm in Figure 7, respectively.
and sectional view along IX-IXK, Figure 1O is a side view showing the state in which the upper part of the bow valve has moved to the lower limit position, Figure 11
This figure and FIG. 12 are sectional views taken along lines XI-XI and -■ in FIG. 1O, respectively.

In the above diagram, the same symbols as in Figures 1 to 5 are number 1.
- Figure 5 shows the same members, 8 is the upper part of the bow valve that is separated from the main hull l and movable up and down, 8al 8b, 8c are the main members that make up the upper part of the bow valve 8, 8a is the upper part of the bow valve 8 that is movable up and down When the bow pulp lower 9 out of 9
A wrap member 8b that slides on part a is a vertical support fixed to the bow valve upper part 8, and a partition that is fixed to the rod '10 connected to the hydraulic drive device 11 to keep the bow valve upper part 8 watertight. It also acts as a plate. 8C is a rail 1a installed on the main hull l when the bow valve upper part 8 moves up and down.
This is a guide member that is inserted into the guide member and guides the bow valve upper part 8 along this guide member.

9 is integrally provided with the main hull l and protrudes forward (5) Bow pulp lower part, 9a, 91), 9C, 9d are main members constituting the bow pulp lower part 9, 9a is the bow pulp part 8 and The sliding wrap member 9b is a cylinder that is connected to a hydraulic drive device 11 and through which a rod 10 that moves up and down is inserted. It is fixed. 9d is a stand on which the hydraulic drive device 11 is installed, and is fixed to the bow pulp lower part 9.

In a ship equipped with such a bow valve, when sailing at the load waterline 4, the bow valve is set to the states shown in FIGS. 7 to 9.

At this time, the bow valve upper part 8 is pushed up to the upper limit via the rod 10 by a drive device 11 installed on the bow pulp lower part 9 and is set to correspond to the load water line 4.

Next, when sailing at light waterline 5, the bow valve should be
It is set (6) to the states shown in Figures 0 to 12.

At that time, the upper part of the bow pulp 8 is replaced with the lower part of the bow pulp 9 as above.
It is set at a height corresponding to the light load waterline 5 via the rod 10 by a drive device 11 installed at.

With such a bow valve, the disadvantage of conventional fixed bow valves is that the propulsion performance in the bow valve shape is reduced due to the emphasis on the fully loaded state, or when the bow valve shape is focused on the light loaded state, the propulsive performance is reduced in the fully loaded state. Propulsion performance in each loading state can be improved by overcoming the performance degradation and setting the optimal bow valve with the smallest hull resistance in both states.

In short, according to the present invention, in a ship equipped with a bow valve that protrudes forward from the bow perpendicular below the water surface at the bow, the bow valve is separated into an upper part and a lower part, and the lower part is integrally provided on the main hull. By configuring the upper part to be movable in the vertical direction, the present invention is industrially extremely useful, since a ship that is economical to operate can be obtained.

[Brief explanation of drawings]

Figure 1 shows the side port side of a known ship's bow valve, Figures 2, 3, 4, and 5 show it.
-H1■-■, IV-IV, VV K A clear cross-sectional view, Figure 6 is a diagram showing the relationship between the speed and horsepower of the ship in Figure 1,
FIG. 7 is a side view showing one embodiment of the present invention, showing a state in which the upper part of the bow pulp is at the upper limit position. Figures 8 and 9 are cross-sectional views taken along ■-■1 and ■-■ in Figure 7, respectively;
Figure 1O is a side view showing the state where the upper part of the bow pulp has moved to the lower limit position, and Figures 11 and 12 are respectively the 1O
It is a sectional view taken along XI-■ and ■-■ in the figure. l... Main hull, 1a... Rail, 4... Load water line, 5... Light load water line, 6... Bow water line, 7 Hull center line, 8... Upper part of bow pulp, 8a ... Wrap member, 8b... Vertical support, 8c... Guide member, 9...
- Bow valve lower part, 9a... Wrap member, 9b... Cylinder, 9c... Partition plate, 9d... Stand, 10...
Rod, 11...hydraulic drive device. Sub-Agent Patent Attorney Masafumi Tsukamoto (9) JP-A-Sho GO-80982 (6)

Claims (1)

[Claims] In a ship equipped with a bow valve that protrudes forward from the bow perpendicular below the water surface in the bow section, the bow valve is separated into an upper part and a lower part, and the lower part is integrally provided on the main hull,
A ship characterized in that the upper part is configured to be movable in the vertical direction.