JPS644416Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a strainer used to remove solid foreign matter such as dirt and sand from liquids (undiluted solutions) that require filtration, such as industrial water, industrial wastewater, sewage, seawater, and crude oil.

It is an object of the present invention to provide a strainer that has excellent ability to remove foreign matter adhering to the screen and whose filtration performance is always maintained in a good condition.

The present invention will be specifically described below based on embodiments shown in the drawings. Reference numeral 1 denotes a cylindrical filtration tank, to which a stock solution inflow pipe 3 is connected near the upper end of a side peripheral wall 2, and a foreign matter discharge pipe 4 is connected near the lower end. The stock solution inflow pipe 3 is arranged so as to face the circumferential connection direction of the side peripheral wall 2, and the stock solution a in the stock solution inflow pipe 3 flows into the filtration tank 1.
After flowing into the interior, it flows diagonally downward as a swirling flow. Further, the foreign matter discharge pipe 4 is also arranged so as to face the circumferential tangential direction of the side peripheral wall 2, so that foreign matter c flowing along the side peripheral wall 2 can be easily discharged to the outside.

A cover 5 of the filtration tank 1 is removably attached to the side peripheral wall 2, and has a shaft support (not shown) formed in the center thereof. A filtrate outflow pipe 8 is passed through the bottom plate 7 of the filtration tank 1.

A cylindrical screen 9 concentric with the filtration tank 1 is fixedly disposed within the filtration tank 1. In the illustrated example, the screen 9 is erected and fixed on the upper end flange portion 10 of the filtrate outflow pipe 8. As shown in the figure, this screen 9 includes, for example, a cylinder 12 made of a stainless steel plate having pores 11, 11, . Although it is possible to adopt a structure mainly consisting of a reinforcing tube 14, it is also possible to adopt a structure formed by wrapping this outer wedge wire, a structure formed of a wire mesh, or the like. In addition, 15 is screen 9
A top plate that closes the upper opening of the top plate 1.
A gap is provided between the cover 5 and the cover 5.

The filtrate outflow pipe 8 is connected to the bottom plate 7 as described above.
After passing through the filter, it exits the filtration tank 1, where it is bent and extends in a desired direction. Through this filtrate outflow pipe 8, the filtrate b filtered through the screen 9 flows out.

A motor 16 is disposed on the cover 5, and a rotating shaft 17 of the motor 16 is guided into the filtration tank 1 through the shaft support. Two brush support rods 19, 19 are attached to the rotating shaft 17 via a horizontal rod portion 18 in a bifurcated manner.

These brush support rods 19, 19 are arranged parallel to the screen 9, and each brush support rod 19 has two brush scraping members 20a, 2.
0b are mounted parallel to each other. Both brush scraping members 20a and 20b are arranged close to each other and are always in elastic contact with the surface of the screen 9. The brush scraping members 20a, 20b may be made of metal wire, nylon wire, or the like. The pair of brush scraping members 20a and 20b attached to the brush support rod 19 can be made of brush materials having similar elasticity and rigidity, but it is preferable to use different materials in consideration of the effects described below. be.

The rotating direction of the brush scraping members 20a, 20b may be set in the same direction as the flow of the stock solution a, as shown in the figure, or may be set in the opposite direction, or may be rotatable in forward and reverse directions.

Next, the operation of this embodiment will be explained. Stock solution inflow pipe 3
The stock solution a flowing into the filtration tank 1 moves diagonally downward while rotating, and passes through the screen 9 while separating a part of the foreign matter c contained in the stock solution a due to centrifugal force during the rotation. It flows into the screen 9. When passing through this screen 9, the foreign matter c contained in the stock solution a cannot pass through the pores 11, 11, . . . and is separated. The filtered liquid (filtrate) b in the screen 9 (of course, microscopic foreign matter having a smaller diameter than the pores 11, 11, . . . is contained therein) is taken out from the filtrate outflow pipe 8.

Foreign matter c separated by the screen 9
is due to the pressure difference between the inside and outside of the screen 9.
It is attached to the outer periphery of the screen 9 so as to cover the holes 1, 11, . . . . The foreign matter c attached to the outer periphery of the screen 9 is removed by the scraping members 20a, 20b, 2.
It is scraped off by 0a and 20b. The scraped foreign matter c is transferred to the foreign matter discharge pipe 4 by the swirling flow.
guided by. The foreign matter discharge pipe 4 is opened at predetermined time intervals to discharge the foreign matter c to the outside.

The screen 9 was cut into pores 11, 11, . . . as shown in FIG. The biting foreign matter A and the laminated foreign matter B stacked on the biting foreign matter A are attached, and floating foreign matter D is present on the laminated foreign matter B around the screen 9. In this embodiment, a pair of scraping members 20a, 20
b, that is, the foreign substances A, B, and D are removed by the first scraping member 20a and the second scraping member 20b.

At that time, the first scraping member 20a bites into the foreign matter A.
A part of the foreign matter A is pulled out and removed from the pores 11, 11..., and at the same time, the foreign matter A that has firmly bitten into the pores 11, 11... is scraped up in the direction of being pulled out, making it easy to remove from the screen 9. . At the same time, the first scraping member 20a removes most of the laminated foreign matter B and floating foreign matter D from above the screen 9.

The screen 9 is first brushed by the first scraping member 20a, and after a short period of time, is second brushed by the second scraping member 20b. At this time, the bitten foreign matter A scraped up by the first scraping member 20a
is easily pulled out and removed from the screen 9 by the second scraping member 20b. Also, the second scraping member 20b removes the laminated foreign matter B and the floating foreign matter D.
The remaining portion is removed from the screen 9.

By one scraping operation of the pair of scraping members 20a and 20b, about 60% of the foreign matter A, B, and D on and around the screen 9 can be removed by first brushing and by second brushing. About 25% is removed by sing, and about 85% is removed overall.

In order to increase the foreign matter removal rate, as shown in FIG. It can be configured according to the following. At this time, approximately 10% of the foreign matter can be further removed by third brushing, and approximately 95% of the foreign matter can be removed overall. However, in this case, the structure becomes complicated and the cost increases. Note that the scraping members 20a, 20b...
It is also possible to increase the number of strips more than three, thereby further increasing the removal rate.

The present invention can be configured in various ways other than those shown in the above embodiments. For example, in the above embodiment, the screen 9 is fixed, and the scraping members 20a, 20b,
Although the configuration is such that 20a and 20b are rotated,
On the contrary, the scraping members 20a, 20b, 20a, 20b
It is possible to have a configuration in which the screen 9 is fixed and the screen 9 is rotated. Also, the screen 9 and the scraping member 20
If relative rotation with a, 20b, 20a, and 20b is configured to be rotatable in forward and reverse directions, the removal rate of foreign matter on the screen 9 can be further improved. Further, in the above embodiment, the scraping members 20a, 20b, 20a, 2
Although 0b is always brought into elastic contact with the outer peripheral surface of the screen 9, it may be brought into constant elastic contact with the inner peripheral surface of the screen 9. Further, in the above embodiment, a plurality of scraping members 20 are provided on each of the two brush support rods 19, 19.
a, 20b, one brush support rod 19 or three or more brush support rods 1
9, 19... a plurality of scraping members 20a,
20b may also be provided. Furthermore, in the above embodiment, the scraping members 20a, 20b
Although a material made of a brush is used as the material, the material is not limited thereto, and, for example, a synthetic resin elastic member formed in the shape of a knife edge may be used.

Since the present invention has the above-mentioned configuration, it is possible to provide a strainer that has excellent ability to remove foreign matter adhering to the screen and maintains good filtration performance at all times, as detailed in the explanation of the operation above.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of an embodiment of the present invention, Fig. 2 is a schematic cross-sectional plan view thereof, Fig. 3 is a cross-sectional plan view of the main part explaining its operation, and Fig. 4 is a cross-sectional view of the embodiment of the present invention. FIG. 2 is a cross-sectional plan view of a main part of the embodiment. 1... Filter tank, 9... Cylindrical screen, 20
a, 20b, 20c... scraping member.

Claims (1)

[Scope of utility model registration request] A member that is in constant elastic contact with the cylindrical screen placed in the filtration tank and rotates relative to the cylindrical screen to scrape off foreign matter adhering to the cylindrical screen is formed by a plurality of scraping members placed close to each other. A strainer comprising: