JP3451028B2 - Oil recovery vessel strainer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil strainer mounted on an oil recovery ship and used, and more particularly to an oil recovery ship strainer for backwashing a screen.

[0002]

2. Description of the Related Art Oil spilled into the sea due to an oil tanker accident or the like must be immediately collected to prevent the occurrence of marine pollution. An oil recovery ship is used as a means of recovering the spilled oil. When collecting oil spills on an oil recovery ship, along with the spilled oil, debris floating on the sea (wood,
Bottles, seaweed, etc.) are also sucked together by the collection pump, so a device with a screen to remove suspended debris is equipped in front of the collection pump.

The strainer, depending on the amount and size of the floating dust, causes the screen to become clogged and block as time passes. If the degree of blockage increases, a large negative pressure is generated on the suction side of the recovery pump, and eventually recovery becomes impossible. Therefore, if the strainer is blocked,
You have to remove the debris from the screen.

Conventionally, as a work for removing dust clogging the screen, a strainer is opened and the screen is manually washed, or backwash water is added to wash the screen. However, the floating dust covered with oil is washed, and the manual work imposes labor-intensive dirt, unsanitary work, and unsafe work on the worker.

Even in the case of washing with backwash water, it is difficult to sufficiently wash away the floating dust clogging the screen. In particular, if the high-viscosity oil is entangled in the screen, it is impossible to completely wash it. For this reason, even if it is backwashed and reused, there is a disadvantage that the time until the next closed state is gradually shortened and the recovery efficiency is reduced.

[0006]

DISCLOSURE OF THE INVENTION The present invention, when backwashing a strainer, mechanically removes the floating dust clogging the screen to perform sufficient washing and shorten the backwashing time.
As a result, the purpose is to improve the recovery efficiency of the spilled oil.

[0007]

[MEANS FOR SOLVING THE PROBLEMS] A strainer for an oil recovery ship, which has an inlet and an outlet of recovered oil water, an inlet and an outlet of backwash water, and is provided with a screen having a cylindrical shape and a side surface of a lattice pattern. In the oil recovery strainer, a scraper plate having claws sandwiched between the grids of the screen is fixed to the scraper rods that are vertically movable in the strainer in multiple stages, and the claws move vertically between the grids. Equipped with a scraper that was enabled, the scraper was activated during backwashing to scrape off the dust clogging between the lattices for backwashing.

A plurality of scraper rods for moving the scraper up and down are arranged at equal intervals, and the scraper rods are guided by a rod guide and connected to cylinders arranged at equal intervals through an integral scraper link. did. Further, the claws are inclined downward toward the inside of the screen, the cross section of the lattice is trapezoidal, and the lattice spacing is widened toward the inside of the screen. Further, the scraper plate is vertically elongated so that the top of the scraper reaches the height of the upper end of the lattice when the scraper is moved upward.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view showing the structure of a strainer according to the present invention. 2 is a partially enlarged view of FIG. 1, FIG. 3 is a plan view taken along line X in FIG. 2, and FIG. 4 is a plan view taken along line Y of FIG. Note that FIG. 5 is a diagram showing a line configuration of a ship-mounted oil spill recovery device and showing an example of use of a strainer.

In FIG. 1, reference numeral 1 denotes a strainer main body, which is partitioned by a screen mounting flange described later to form an upper chamber A and a lower chamber B. The upper chamber A is provided with an inlet 2 of recovered oil water and an outlet 3 of backwash water, and the lower chamber B is provided with an outlet 4 of recovered oil water and an inlet 5 of backwash water. Reference numeral 6 denotes a drain discharge opening provided at the bottom of the lower chamber B.

Reference numeral 7 denotes a cylindrical screen, the side surfaces of which are formed in a lattice shape and which is placed in the center of the lower chamber B.
This screen 7 has a bottom plate 8 having a large number of holes perforated therein, and a plurality of grids 9 arranged on the bottom plate 8 in a cylindrical shape at equal intervals.
And the bundles 10 and 1 for bundling the lattice 9 at the upper and middle portions.
1 and a circular donut-shaped screen mounting flange 12 fixed to the outer periphery of the upper bundle 10.

As shown in FIG. 1, the screen 7 has a screen mounting flange 12 mounted on a body flange 13 which forms a stepped portion between the upper chamber A and the lower chamber B of the strainer body 1 and is closely attached thereto. It is fixed and supported in the center of the lower chamber B. The interval between the grids 9 is such that dust that does not hinder suction even if sucked by the recovery pump in the subsequent stage is passed through.

As shown in FIGS. 3 and 4, the cross section of the lattice 9 is trapezoidal and the lattice spacing is widened toward the inside of the screen 7. In this way, the grid spacing is set to screen 7.
By widening the inside of the grid, dust scraped between the grids is dropped into the screen 7.
The bundle 11 for bundling the middle portion of the lattice 9 is a ring having a slightly smaller diameter, and the projections 9'fixed to the lattices 9 are fixed by welding.

Reference numeral 14 denotes a scraper which can move up and down in the strainer 1, and is fixed to the scraper rods 15 and 16 and the middle and lower end portions of the scraper rods 15 and 16 and is arranged along the outer periphery of the screen 7. Scraper plates 17, 18 provided with claws 19, 20 sandwiched between the lattices 9
And cylinders 21 and 22 for vertically moving the scraper rods 15 and 16.

The cylinders 21 and 22 are attached to the strainer main body flange 13, and the cylinder rod thereof penetrates the main body flange 13 and projects into the upper chamber A. And
Scraper links 23 are attached to the front ends of both cylinder rods, and the scraper rods 15 and 16 are fixedly connected to the scraper links 23. Therefore, by operating the cylinders 21 and 22, the scraper link 23
The scraper rods 15 and 16 are moved up and down via.

Two scraper rods 15 and 16 are arranged on the left and right sides in the drawing, but it is also possible to arrange three or four scraper rods at intervals of 120 degrees or 90 degrees. Also, a plurality of cylinders 21 and 22 may be similarly arranged. However, in any case, the scraper link 23 is 1
The body. With this configuration, the ring-shaped scraper plates 17 and 18 can be vertically moved without tilting, and the scraper claws 19 and 20 can be vertically moved between the lattices 9 each having a narrow width and a long length.

The claws 19 of the scraper are vertically elongated so as to project upward from the scraper plate 17. When the scraper is moved upward, the tops of the claws 19 reach the height of the upper end of the lattice 9. With this structure, dust trapped between the lattices 9 can be scraped up to the upper end thereof. The claw 20 does not need to project upward and is formed as a convex portion on the scraper plate 18. The claws 19 and 20 are inclined downward toward the inside of the screen 7. By making such an inclination, the dust scraped between the grids is dropped into the screen 7.

Although the two stages of the scraper plates 17 and 18 are provided in the above embodiment, the scraper plates may have three stages. By providing a plurality of stages, the scraping is shared by each stage in the vertical direction, so that the strokes of the cylinders 21 and 22 can be shortened. In the figure, 24 and 25 are axial water sealing devices for the cylinder rods of the cylinders 21 and 22, and 26 and 27 are scraper rods 15,
16 rod guides.

FIG. 5 is a diagram showing the line configuration of a ship-mounted type oil spill recovery system, in which the oil recovery device 2 submerged in the sea surface.
8, the two strainers 1, two recovery pumps 29, and a recovery tank 30 are connected by a recovery pipe. Further, the seawater suction box 31 submerged in the sea, the backwash pump 32, the two strainers 1, and the garbage collection box 33 are connected by backwash piping. Switching valve (not shown) before and after each device in piping
Is provided.

Two strainers 1 are provided for switching operation. When the recovery pump 29 is driven, the spilled oil floating on the sea surface is recovered from the oil recovery device 28 through the recovery pump 29 with the diameter of the one strainer 1 and recovered in the recovery tank 30. At this time, in order to backwash the other strainer 1, the backwash pump 32
To drive the backwash water into the other strainer 1. Thus, the dust clogging the other strainer 1 is collected in the dust collecting box 33 together with the backwash water.

The configuration of the present invention is as described above, and its operation will be described below. When backwashing the strainer, first add backwash water to the strainer. Then, the scraper is operated while passing the backwash water through the strainer. As a result, dust clogged between the grids of the screen is scraped by the claws of the scraper, and the scraped dust is dropped inside the screen. Therefore, this dust, together with the dust accumulated on the screen, is discharged along with the backwash water to the outside of the strainer, and the screen is washed.

[0022]

The present invention provides a strainer for an oil recovery ship,
A scraper with claws sandwiched between the grids of the screen was provided, and the scraper was moved up and down during backwashing so that the backwashing was performed while scraping off the dust clogging between the grids, so the screen can be thoroughly washed. .

Further, since the claw is moved straight up and down and the scraped dust is dropped inside the screen, the cleaning degree can be further increased. As a result, the screen was sufficiently washed, the washing time was shortened, and the spilled oil recovery efficiency was improved.

[Brief description of drawings]

FIG. 1 is a front sectional view of a strainer according to the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a plan view taken along line X of FIG.

FIG. 4 is a plan view taken along line Y of FIG.

FIG. 5 is a diagram showing a line configuration of a ship-mounted type oil spill recovery device.

[Explanation of symbols]

1 Strainer Main Body 2 Oil Water Inlet 3 Backwash Water Outlet 4 Oil Water Outlet 5 Backwash Water Inlet 6 Drain Outlet 7 Screen 8 Bottom Plate 9 Lattice 10, 11 Bundle 12 Screen Mounting Flange 13 Body Flange 14 Scraper 15, 16 Scraper Rod 17, 18 Scraper plate 19, 20 Claw 21, 22 Cylinder 23 Scraper link 24, 25 Shaft water sealing device 26, 27 Rod guide 28 Oil collector 29 Oil recovery pump 30 Oil recovery tank 31 Seawater suction box 32 Backwash pump 33 Waste collection box A strainer upper chamber B strainer lower chamber

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B01D 29/66 B01D 35/02 B01D 35/16 B63B 35/32

Claims (4)

(57) [Claims] 1. An oil recovery strainer having a screen having a cylindrical shape and a lattice-shaped side surface, which has an inlet and an outlet of recovered oil water and an inlet and an outlet of backwash water, and is provided between each lattice of the screen. The scraper plate with the claws to be clamped is fixed to the scraper rods that can be moved up and down in the strainer in multiple stages, and the claws can be moved up and down between the lattices. The oil recovery ship strainer is characterized in that it backwashes while scraping off the dust that has become clogged between the grids. 2. The scraper rods arranged at equal intervals are guided by a rod guide, and are connected to the cylinders arranged at equal intervals via an integral scraper link. A strainer for an oil recovery ship according to Item 1. 3. The claw is inclined downward toward the inside of the screen, the cross section of the lattice is trapezoidal, and the lattice spacing is widened toward the inside of the screen. The strainer for an oil recovery ship according to Item 2. 4. A claw which is vertically long and projects upward from the scraper plate, and when the scraper is moved upward, a claw whose top reaches the height of the upper end of the lattice is used.
Alternatively, the strainer for an oil recovery ship according to claim 2 or claim 3.