JPH0639767Y2 - Cylindrical water strainer for ships - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a tubular water strainer for ships. More specifically, it relates to a cylindrical strainer used in a water pipe system of a ship. The water pipe system of the ship referred to here includes a bilge suction pipe line, a ballast suction pipe line, etc. in addition to a seawater intake pipe line installed in the engine room of the ship.

[Prior Art] Japanese Industrial Standard F7121
There is one described in.

The water strainer 50 will be described with reference to FIG.

Reference numeral 1 is a casing, which has a bottomed cylindrical strained tube housing chamber 2,
An inflow port 3 and a discharge port 4 are formed on both sides thereof.
A strain tube 20 is mounted in the storage chamber 2, and the upper surface of the storage chamber 2 is sealed with a lid 5.

The strainer tube 20 is a bottomed cylindrical container made of metal, and has an opening 21 formed on one side surface at the top. The inner diameter of the opening 21 is almost the same as the inner diameter of the inlet 3 of the casing 1. Also,
A large number of strain holes 22 are formed in the wall surface of the strain cylinder 20.
The inner diameter of the strain hole 22 is usually around 8 mm.

[Problems to be solved by the invention] With the conventional water strainer 50, relatively large dust and the like could be removed, but relatively small dust and microorganisms that easily pass through the strain hole 22 with an inner diameter of 8 mm can be removed. I couldn't. Therefore, there is a problem that the protection of the pump and the like installed in the water pipe system is not sufficient.

It should be possible to remove small dust and microorganisms by reducing the inner diameter of the strain hole, but this will increase the conduit resistance extremely, so it is necessary to increase the passage area for the fluid strainer. Therefore, a large-capacity strainer is often installed, and the clogging of the strainer holes frequently occurs, resulting in the problem that frequent cleaning is required.

Therefore, both the propositions of removing small debris and microorganisms and avoiding an increase in the conduit resistance of the water pipe system are antinomy and have never been achieved in any kind of water strainer.

Therefore, an object of the present invention is to provide a cylindrical water strainer for a ship, which is capable of avoiding an increase in pipeline resistance while effectively removing small dust and microorganisms.

[Means for Solving the Problems] A cylindrical water strainer for a ship according to the present invention includes a casing having a strainer cylinder storage chamber formed between a fluid inlet and a discharge port, and a casing installed in the casing. It consists of a cylindrical outer strainer cylinder with a number of strain holes formed in the wall surface and an inner strainer cylinder mounted inside the outer strainer cylinder, the strainer cylinder being the front of the inner strainer cylinder and the casing flow. A large-diameter inflow hole is drilled in the area facing the inlet, and a small-diameter strain hole is drilled in the rear and bottom of the strainer cylinder, even if all the fluid flows between the outer strainer and the inner strainer. It is characterized in that a sufficient gap is formed so that pipe resistance does not become a problem.

Further, according to the present invention, it is preferable to form an inflow hole in a portion of the front surface of the inner straining tube that faces the inlet of the casing.

[Operation] In the present invention, the water (including seawater) entering from the inlet of the casing first flows into the outer strainer cylinder, and a part of the water further flows from the inflow hole of the inner strainer cylinder. Since it is filtered through a small diameter strain hole in the inner strainer, it passes through the outer strainer with small dust and microbes removed, and then exits from the outlet of the casing. Then, the water flowing through the gap between the outer strainer and the inner strainer is filtered by the outer strainer and discharged.

As described above, since all the inflowing water passes through the outer strainer, large dust is removed as in the conventional example, and some of the water passes through the inner strainer, which is small enough to be practically acceptable. And microorganisms are also removed. Therefore, there is almost no possibility of damaging the water pipe system pump or the like, or clogging or accumulating in the tube of the heat exchanger. And
Part of the amount of flowing water does not enter the inner straining cylinder but goes out only through the outer straining cylinder, so that it is possible to avoid an abnormal increase in the conduit resistance.

In addition, since the inflow hole of the inner strainer is drilled in the part facing the inflow port of the casing, small dust and microorganisms can flow into the water and enter the inflow hole as it is without changing the direction. The ratio of the amount of microorganisms and the like that can be captured by the inner strainer among the microorganisms and the like therein is large.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 4 shows a water pipe system L equipped with a strainer A according to an embodiment of the present invention. That is, in this figure, B
Is an outer plate of a ship, and a seawater box C is provided in a part thereof. The seawater box C and a pump P mounted in the engine room are connected by a water pipe L, and a stop valve V and a water strainer A of this embodiment are provided in the middle of the water pipe L.

Next, the details of the strainer A will be described with reference to FIGS. In the figure, the same parts as those of the conventional example shown in FIG. 5 are designated by the same reference numerals.

The casing 1 is provided with a bottomed cylindrical strain tube housing chamber 2, and an inflow port 3 and a discharge port 4 are formed on both sides of the upper portion thereof. Further, flanges 6 and 7 for interposing the water pipe L are formed at the inlet 3 and the outlet 4. The upper surface of the storage chamber 2 is open and the lid 5 is attached. This lid 5
Is held in the storage chamber 2 by a holding bolt 9 screwed into the lid holding 8
Is pressed against the upper surface of the via a gasket 11. Further, a plug 12 is screwed into an appropriate place of the lid 5.

An outer strainer cylinder 20 is mounted in the accommodation chamber 2. That is, the ring 23 is fixed to the outer circumference of the upper end of the outer strainer 20, and the ring 23 is fixed by being fitted to the stepped collar 13 formed on the inner circumference of the upper portion of the casing 1. This outside strainer cylinder 20 is the conventional strainer cylinder 20 shown in FIG.
It is the same part as. Therefore, a circular opening 21 is formed in the upper part of the front surface, and a large number of strain holes 22 are formed on the entire surface of the cylinder wall. The inner diameter of the strain hole 22 is, for example, the nominal diameter (the inner diameter of the discharge port 4 expressed in mm) 40 to 100.
In the case of the water strainer, it is usually 8 mm, and the total area of the strainer holes 22 is about 4 to 4.5 times the cross-sectional area of the discharge port. Between the opening 21 and the inlet 3 of the casing 1, a steel pad
24 is installed.

An inner strainer cylinder 30 is mounted inside the outer strainer cylinder 20. The inner strainer cylinder 30 is a cylinder-shaped strainer cylinder, and a top plate 35 having a circular opening is provided at the upper end thereof. Then, the top plate 35 and the holding plate 36 that also serves as a handle are fastened to the ring 23 of the outer strainer tube 20 with bolts 37, so that the inner strainer tube 30 is attached. The outer diameter of the inner strain tube 30 is the outer strain tube 20
The inner diameter is smaller than the inner diameter, and a gap 25 through which all the fluid flows is formed between the inner straining cylinder 30 and the outer straining cylinder 20.

The size of the gap 25 is a factor that determines the conduit resistance, because it determines the amount of water that does not pass through the inner straining cylinder 30 but only through the outer straining cylinder 20, and the diameter of the inner straining cylinder 30 is The inner strainer is a factor that determines the amount of water to be filtered. These numerical values may be set based on the desired filtration performance.

The front side of the inner strainer cylinder 30 and the inlet 3 of the casing 1.
An inflow hole 31 is bored in a portion facing to. Since the inflow hole 31 faces the water entering from the inflow port 3 at a right angle, small dust, microorganisms and the like can easily enter. The diameter and number of the inflow holes 31 are one of the factors that determine the amount of water filtered by the inner strainer 30.
The larger the total area is, the more the filtered water amount can be increased. At the same time, the total area of the inflow holes 31 is also a factor that determines the amount of water filtered only by the outer strainer 20, and its numerical value may be determined to be an optimum value from the amount of microorganisms to be filtered and the numerical value of the conduit resistance. In this embodiment, 20 to 25 inflow holes having a hole diameter of 20 mm are bored.

A small diameter strain hole 32 is formed in the rear surface of the inner strainer cylinder 30, that is, in the region from the both sides of the strainer cylinder to the back surface, which is denoted by Z in FIG. The hole diameter of the strain hole 32 must be such that small dust and microorganisms can be captured without passing through it, and in this embodiment, the hole diameter is set to 1 mm. The pore diameter and the number of perforations of the strain holes 32, that is, the total area of the strain holes 32 is also a factor that determines the amount of microorganisms or the like to be filtered and the line resistance, and the optimum value may be determined from the desired filtration performance.

Inside the inner strain tube 30, the following two types of baffles 33, 34 are provided.
Is provided. The baffle plate 33 is a rectangular plate and has an inflow hole.
It is provided on the back side of 31 and is directed obliquely to the direction of water flow (arrow a in FIG. 2). Therefore, the inflow hole 31
The water entering from the inside is spirally swirled inside the inner strainer tube 30 and uniformly applied to the strainer holes 32 as shown by an arrow c in FIG.

The baffle plate 34 is a substantially semicircular plate, and is horizontally attached below the baffle plate 33. The tip edge of the baffle plate 34 is bent slightly downward. This baffle
34 is provided in order to prevent the small dust and microorganisms that have settled up from coming out of the inflow hole 31.

Next, the filtering action of this embodiment will be described with reference to FIGS. 1 and 3.

When seawater is taken in as indicated by the arrow a, it first enters the outer strainer cylinder 20, part of which enters the inside through the inflow hole 31 of the inner strainer cylinder 30, and the rest of the gap 25 around the inner strainer cylinder 30. Pass through and filter through the outer strainer tube 20 only.

The water that has entered the inner strainer tube 30 is swirled in a spiral shape by the baffle plate 3 (arrow c), while small dust and microorganisms are strained through the strainer hole.
Since it cannot pass through 32, it is deposited at the bottom of the inner strainer tube 30. Since the microorganisms and the like that have once settled are prevented from floating by the baffle plate 34, it is possible to avoid clogging of the strain hole 32 in the inner strainer tube 30 as much as possible. Then, the water filtered out through the straining hole 32 of the inner straining tube 30 flows through the gap 25, flows through the outer straining tube 20, and is sent from the discharge port 4 to the pump P.

On the other hand, as indicated by the arrow e, the gap 25 around the inner strainer tube 30
The water passing through is filtered only by the outer strainer 20 and discharged as indicated by arrow b. As described above, since there is the gap 25 through which water flows without passing through the inner straining tube 30, it is possible to suppress the increase in the pipeline resistance to a practically allowable level.

[Advantage of Invention] According to the present invention, it is possible to effectively remove small dust, microorganisms and the like, which have been impossible in the past, and to solve the contradictory proposition that the increase in duct resistance is suppressed as much as possible. it can.

[Brief description of drawings]

FIG. 1 is a cylindrical water strainer A for a ship according to an embodiment of the present invention.
2 is a partially cutaway perspective view showing the inner strainer cylinder 30 shown in FIG. 1 with the top plate 33 omitted, and FIG. 3 shows the filtering action of the strainer A of the same embodiment. Explanatory drawing, FIG. 4 is explanatory drawing of the water pipe system which attached the strainer A of the same Example, and FIG. 5 is sectional drawing of the conventional cylindrical water strainer for ships. (Main symbols in the drawing) 1: Casing 3: Inlet 4: Outlet 20: Outer strain cylinder 21: Opening 22: Strain hole 30: Inner strain cylinder 31: Inflow hole 32: Strain hole 33: Baffle plate 34: Baffle plate

Claims (3)

[Scope of utility model registration request] 1. A casing having a strain-cylinder accommodating chamber formed between a fluid inlet and a discharge port, and a cylindrical outer strainer mounted in the accommodating chamber of the casing and having a number of strain holes formed in its wall surface. A cylinder and an inner strainer mounted inside the outer strainer, wherein the inner strainer has a large-diameter inflow hole drilled in a portion of the front face of the strainer that faces the inlet of the casing. Is
There are small holes in the rear and bottom of the strainer cylinder, and there is a sufficient gap between the outer strainer cylinder and the inner strainer cylinder so that pipe resistance does not become a problem even if all the fluid flows. A cylindrical water strainer for ships. 2. The baffle plate for swirling the inflowing fluid in the inside cylinder is provided inside the wall surface where the inflow hole is bored, in the inside cylinder. A cylindrical strainer for ships. 3. The baffle plate is provided inside the strainer cylinder and below the inflow port, the baffle plate for preventing the substance settled in the strainer cylinder from floating. 1. A cylindrical water strainer for ships according to 1.