JPH031045Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a type of filtration device in which a cylindrical screen is subjected to filtration with a scraping member in elastic sliding contact with industrial water, industrial wastewater, and sewage. It is used to remove certain solid substances such as garbage, earth and sand from liquids such as seawater and other raw solutions.

(Prior Art) This type of filtration device is known from Japanese Patent Application Laid-Open No. 59-55324. As shown in FIGS. 7 and 8, in this device, a scraping member b that elastically slides on the cylindrical screen a is attached to the cylindrical screen a.
It has a length spanning the entire axial length of.

(Problems to be Solved by the Invention) If the scraping member b has a length that spans the entire length of the cylindrical screen a as in the prior art, as shown in FIG. If a foreign object c gets caught between the scraping member b and the scraping member b, most of the scraping member b will be lifted off the cylindrical screen a, and the scraping effect will be lost. Further, the cylindrical screen a has undulations and local irregularities in the axial direction as shown in Fig. 8 due to various reasons such as the roundness being not constant in the axial direction, but even in this case, the scraping member b has a cylindrical The screen a does not fit into the recessed part d and floats, which makes it impossible to scrape that part at all, leading to early clogging.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention divides the scraping member that elastically slides into contact with the cylindrical screen in the axial direction of the cylindrical screen. They are characterized in that they slide into contact independently of each other.

The scraping member is a brush, scraper, etc.
Either it is pivoted about the axis of the cylindrical screen or it is brought into sliding contact with the cylindrical screen by rotation of the cylindrical screen. This sliding contact may be made on the outer peripheral surface or the inner peripheral surface of the cylindrical screen.

(Function) Since each of the scraping members divided in the axial direction of the cylindrical screen is individually and independently slidably contacted with the cylindrical screen, foreign matter is not caught between the cylindrical screen and the scraping member. Even if the foreign object is caught in the scraping member, the scraping member in the part where the foreign object is caught will simply float away from the cylindrical screen, and the other parts of the scraping member other than the part where the foreign object is caught will continue to come into sliding contact with the cylindrical screen without being affected by the foreign object. It is possible to take action. In addition, even if the cylindrical screen has undulations or local recesses in the axial direction due to mismatch in roundness in the axial direction, each divided scraping member can individually slide into each part of the cylindrical screen in the axial direction. ,
It easily conforms to the undulations and local recesses, and can prevent floating between the screen and the cylindrical screen.

〔Example〕

To explain the first embodiment of the present invention shown in FIGS. 1 to 4, a filtration tank 1 having a cylindrical shape has a undiluted solution inlet pipe 3 at the upper end of a side wall 2, and a foreign substance at the lower end of the side wall 2. Discharge pipes 4 are connected to each. The stock solution inflow pipe 3 is provided so as to face the circumferential tangential direction of the side peripheral wall 2, and the stock solution inflow pipe 3 is provided to face the filtration tank 1 through the stock solution inflow pipe 3.
The stock solution A flowing into the filter tank 1 is configured to flow obliquely downward as a swirling flow along the side peripheral wall 2 within the filter tank 1. Further, the foreign matter discharge pipe 4 is also provided in the circumferential tangential direction of the side circumferential wall 2, which is also in the forward direction with respect to the swirling flow of the stock solution in the filtration tank 1, to remove foreign matter c flowing along the side circumferential wall 2.
This makes it easier to extract external information.

A removable cover 5 is provided at the upper end of the filtration tank 1, and a bottom plate 6 is provided at the lower end with a filtrate outflow pipe 7 passing through the center. A cylindrical screen 8 concentric with the filtration tank 1 is provided within the filtration tank 1,
Upper end flange 7 in the filtration tank 1 of the filtrate outflow pipe 7
It is erected and fixed on top a and connected to the filtrate outflow pipe 7. As shown in FIG. 1, the screen 8 includes a cylinder 10 made of stainless steel plate having pores 9 formed by punching, and a reinforcing cylinder 12 having relatively large holes 11 attached to the inner circumference of the cylinder 10. It is possible to adopt a filter mainly composed of the above, but it is preferable to use a variety of filters, such as one wrapped with wedge wire or a wire mesh, as appropriate depending on the type of stock solution and the purpose of filtration.

The upper end of the cylindrical screen 8 is closed by a top plate 13. The filtrate outflow pipe 7 is bent at a portion protruding downward from the bottom plate 6 of the filtration tank 1 and extends in a desired direction, so that the filtrate B that has passed through the cylindrical screen 8 is bent.
to flow out.

A motor 14 is attached to the upper surface of the cover 5 of the filtration tank 1, and its output shaft 15 faces the gap between the cover 5 and the top plate 13 below. Two scraping member support rods 1 are connected to the protruding end of this output shaft 15 via a horizontal rod 16.
7 is attached in a bifurcated manner, each scraping member support rod 17 is located on both sides of the cylindrical screen 8 in parallel with the axis of the cylindrical screen 8, and the motor 14
It is designed to be rotated around the outside of the cylindrical screen 8 by the rotation of the screen.

Each scraping member support rod 17 having the same length corresponding to the entire axial length of the cylindrical screen 8 is provided with a brush 18 that elastically slides into contact with the cylindrical screen 8 as a scraping member.
It is divided into many parts in the axial direction, and each part is mounted so as to be able to rotate independently. Each brush 18 attached to one scraping member support rod 17 is individually biased by a spring 20 acting between the scraping member support rod 17 and an auxiliary rod 19 disposed integrally with the scraping member support rod 17. They are adapted to individually elastically slide into contact with the cylindrical screen 8. The brush 18 may be made of metal wire, nylon wire, or any other suitable material.

The stock solution A that has flowed into the filtration tank 1 through the stock solution inflow pipe 3 moves downward while swirling inside the filtration tank 1.
Due to the centrifugal force during the swirling, a part of the foreign matter C contained in the stock solution A is pressed against the inner surface of the side peripheral wall 2 of the filtration tank 1 and separated, while passing through the cylindrical screen 8 inside the swirling flow and flowing into the cylindrical screen 8. do. At this time, foreign substances in the stock solution A cannot pass through the pores 9 and are left behind, and are separated from the filtrate B flowing into the screen 8. Filtrate B is taken out from filtrate outflow tube 7.

Foreign matter C separated by the screen 8
The pores 9 are closed due to the pressure difference between the inside and outside of the screen 8.
It adheres to the outer periphery of the screen 8 so as to block it. Foreign matter C attached to the outer periphery of this screen 8
is scraped off by the sliding contact of the brush 18 with the screen 8. The scraped foreign matter C and the centrifuged foreign matter C are transferred to the inner lower end of the side circumferential wall 2 of the filtration tank 1 by the swirling flow within the filtration tank 1 and guided to the foreign matter discharge pipe 4. The foreign matter discharge pipe 4 is opened at predetermined time intervals to discharge accumulated foreign matter C.

When the brush 18 slides against the screen 8 to scrape off the foreign matter C, the foreign matter C is sometimes caught between the brush 18 and the screen 8 as shown in FIG. At this time,
The brush 18 that has bitten the foreign substance C floats off the screen 8, but the other brushes 18 remain in sliding contact with the screen 8 without being affected by the biting with the foreign substance C, as can be seen in the figure. continues to perform the action of scraping off foreign matter C.

Furthermore, even if the cylindrical screen 8 is wavy in the axial direction or has local recesses as shown in FIG. They are brought into sliding contact with the screen 8 individually, and blend well with the entire screen 8 without causing any floating, and no foreign matter C is left behind after being scraped off.

The brush 18 is brought into sliding contact with the inner circumference of the cylindrical screen 8 as shown in FIG.
It is also possible to remove foreign matter adhering to the inside from the inside. Further, a scraper 21 as shown in FIG. 6 may be used instead. In this case, since there is no ability to enter the pores, the stock solution receiving side of the screen 8, that is, in the case of the above embodiment, the screen 8 as shown in the figure.
It is appropriate to make sliding contact with the outer periphery.

(Effect of the invention) According to the invention, since it has the above-mentioned structure and function, even if a scraping member such as a brush or scraper catches a foreign object between it and the cylindrical screen, the lifting caused by the foreign object will only occur at the part where the foreign object is caught. Even if there are undulations or local depressions in the axial direction of the cylindrical screen, each divided unit is well integrated and does not cause floating, so the screen can be prevented from clogging as much as possible and can be used for a long time. Stable filtration function can be guaranteed over time.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view showing an embodiment of the present invention with main parts cut away, Fig. 2 is a schematic cross-sectional view of Fig. 1, and Fig. 3 is a cylindrical shape showing a state in which a foreign object is caught. FIG. 4 is a partial side view showing the state of sliding contact between the brush and a cylindrical screen with undulations in the axial direction. FIGS. FIGS. 7 and 8 are partial side views of the conventional example in which a foreign object is caught and the screen is wavy, respectively. It is. 8... Cylindrical screen, 14... Motor, 1
7...Scraping member support rod, {18...Brush (scraping member), 21...Scraper} (scraping member),
20... Spring.

Claims (1)

[Claims for Utility Model Registration] (1) A scraping member that elastically slides on the cylindrical screen is divided in the axial direction of the cylindrical screen so that they slide on each other independently. Filtration device. (2) The filtration device according to claim 1, wherein the scraping member is driven to rotate around the axis of the cylindrical screen. (3) The filtration device according to claim 1, wherein the cylindrical screen is rotationally driven. (4) The scraping member is in sliding contact with the outer peripheral surface of the cylindrical screen.
Filtration device as described in section. (5) The scraping member is in sliding contact with the inner peripheral surface of the cylindrical screen.
Filtration device as described in section. (6) The filtration device according to claim 1, wherein the scraping member is a brush or a scraper.