JPH0230017Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention is a multi-layer system using a wedge-shaped wire that filters and cleans cutting fluids, polishing fluids, etc., and at the same time removes solid matter that has adhered during filtration through back cleaning. This invention relates to a chamber type drum filter.

Conventional technology Similar to the present invention, a large number of axial ducts are provided on the circumferential surface of a vertical rotating drum, and wedge-shaped wires are wound and fixed around the outer periphery of the ducts with small gaps between them to provide communication to each duct. The filtered fluid is sequentially pressurized into the rotating duct from a slide fitting that slides into contact with the drum head having holes to remove filtered solids that have clogged the small gap, while the filtered fluid is removed from the suction chamber with which other ducts communicate. Drum filters for sucking fluid are known in the art.

Figures 4 and 5 show the state in which wedge-shaped wires are wound and fixed in a conventional drum filter of this kind. 1 is a vertical rotating drum, and short fences long in the axial direction are fixed to the outer circumference of the drum at equal intervals. A large number of ducts 3 are formed by the partition plates 2, and the pointed portions 5 of wires 4 having a wedge-shaped cross section are fixed to the outer periphery of the partition plates 2 by welding, and small gaps 7 are created between the flat surfaces 6 of the wires 4. It is preserved. When the duct 3 is immersed in the liquid to be filtered and the liquid is sucked up from the duct 3, the solid matter a in the liquid to be filtered is separated and adhered to the outside of the small gap 7, and only the fluid is sucked out through the duct 3. Ru. In this case, since the adhering solid matter a adheres to the flat surface 6 of the wire 4, it is easy to scrape it off with a scraper, but the wedge-shaped wire 4 are connected in a short-circuit manner by the space 9 between them, so the injection pressure decreases and the ability to remove the adhering solid matter a decreases, while at the same time the suction negative pressure of other ducts decreases and the filtration efficiency decreases. There is a problem with doing so.

Problems to be Solved by the Invention The purpose of the present invention is to solve the above-mentioned problems in the conventional multi-chamber drum filter using wedge-shaped wires.

Means for Solving the Problems The present invention provides flat surfaces of wedge-shaped wires on the outer edges of a large number of axial ducts with open outer circumferences formed along the circumferential surface of a vertical rotating drum immersed in the liquid to be filtered. It is wrapped and fixed with a small gap in the axial direction, and slides into contact with a drum head that has communication holes to each duct fixed to the upper end of the drum, and as the drum rotates, the filtered liquid is forced into the ducts through the matching communication holes. The present invention is characterized in that a slide fitting is provided, and a filtered liquid suction chamber is provided in which all other ducts that do not match the slide fitting communicate through communication holes.

Action When the filtered liquid is sucked out from the filtered liquid suction chamber, the liquid to be filtered is sucked into the duct through the small gap of the wedge-shaped wire due to the negative suction pressure, and at this time, solid matter in the liquid, such as chips, is filtered out. and is attached to the outer surface of the wedge-shaped wire so as to close the small gap and prevent fluid flow between adjacent ducts. Therefore, in the duct into which the filtrate is press-fitted from the slide fitting, adhering solids can be effectively removed without reducing the press-in pressure, and in other ducts, suction negative pressure can be well maintained. It drips and exhibits sufficient filtration ability.

Embodiment FIGS. 1 to 3 show an embodiment of the present invention. The drum filter 10 of the present invention includes a large number of axially short fence-shaped partition plates 13 fixed radially at equal intervals on the outer periphery of a vertical rotating drum 12 inserted into a liquid tank 11 to be filtered.
The duct 14 has an annular mounting plate 15 and a bottom plate 16 fixed to its upper and lower ends, respectively. As shown in FIG. 3, a flat surface 18 of a wedge-shaped wire 17 is wound and welded around the outer edge of the partition plate 13 with a predetermined small gap 19 in the axial direction, and the drum 12 is attached to the drum head 20 using the mounting plate 15. Fix it.

An inverted dish-shaped head housing 2 is placed on the tank 11 to be filtered.
1 is fixed with a flange 21a, and the housing 2
Inner part 2 protruding from one side of the inside of 1 to the center
A center hole 23 is provided in 2, a bearing 24 that can withstand thrust loads is fitted into the center hole 23, and a rotating shaft 25 is supported thereon, and the center of the drum head 20 is fixed to the lower end thereof with a key 26 and a nut 27. It is brought into contact with the lower surface of the inner portion 22 and the upper surface 28 of the stepped portion formed on the lower inner surface of the head housing 21.
29 and 30 are oil seals, and 31 is an O-link.

Each duct 7 is attached to the mounting plate 15 and the drum head 20.
A communication hole 32 communicating with each of the inner portions 22 is bored.
The sealed space inside the head housing 21 except for the suction chamber 33 is connected to each duct 7, and a suction port 34 is provided in the suction chamber 33.

A stepped hole 35 facing the movement path of the communication hole 32 and a backwash port 36 communicating with the upper end of the hole 35 are bored in the inner part 22, and a slide cylinder 37 fitted into the hole 35 is moved by a spring 38 to the drum head 20.
A passage 39 communicating with the communication hole 32 is bored in the slide cylinder 37 .

The output shaft of a deceleration motor 40 mounted on the head housing 21 is fitted into a hole formed in the upper part of the rotary shaft 25 and connected with a key 41.

The rotating drum 12 is surrounded by an airtight cover 42 that is airtightly connected to the head housing 21 and penetrates into the liquid 8 to be filtered.

When the suction port 34 and the backflow port 36 are respectively connected to the suction port and discharge port of a pump (not shown) and the motor 40 is rotated, the level of the liquid to be filtered in the airtight cover 42 rises due to negative pressure, and the small gap 19 The solid matter a in the liquid is filtered through the small gap 19 and attached to the wire 17. The filtered liquid sucked into the duct 14 is transferred to the suction chamber 33.
is collected and discharged from port 34. At the same time, the filtered liquid injected from the port 36 passes through the flow path 39 and the communication hole 32 and flows into one duct 14.
The solid matter a that was press-fitted into the duct and attached to the wire 17 outside the duct is blown away to remove the clogging. When the filtered liquid is forced into the hole 32 from the flow path 39, the slide cylinder 37 is brought into close contact with the drum head 20 by the spring pressure, so that the filtered liquid does not leak into the suction chamber 33 from the joint surface between the two. do not have.

During the above operation, the solid matter a attached between the wedge-shaped wires 17 obstructs the flow of liquid between the adjacent ducts 14, so that the filtered liquid press-fitted into the duct 14 flows into the adjacent duct having negative pressure. The negative pressure does not decrease, and the liquid pressure inside the duct 14 communicating with the flow path 39 does not decrease, so that the filtration ability and the clogging removal ability are simultaneously exhibited satisfactorily.

Effects of the invention The present invention has the above-mentioned configuration, and can simultaneously improve the filtration ability and the clogging removal ability of a drum filter that performs filtration and clogging removal simultaneously, and
The solid matter itself attached to the wedge-shaped wire also acts as a filter by covering the duct, which has the effect of making the filtration effect even better.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of the embodiment of the present invention, Fig. 2 is a cross-sectional plan view showing a section taken along line B-B as part of the section taken along line A-A in Fig. 1, and Fig. 3 is a partial longitudinal section of the duct. side view,
FIG. 4 is a view similar to FIG. 3 of a conventional drum filter, and FIG. 5 is a partially sectional plan view of the rotating drum. 12... Vertical rotating drum, 14... Duct, 1
7... Wedge-shaped wire, 18... Flat surface, 19
...Small gap, 20...Drum head, 32...Communication hole, 33...Suction chamber, 37...Slide metal fitting.

Claims (1)

[Scope of utility model registration request] A flat surface of a wedge-shaped wire is wound axially with a small gap around the outer edge of a large number of axial ducts with an open outer periphery formed along the circumferential surface of a vertical rotating drum that is immersed in the liquid to be filtered. A slide fitting is provided that slides into the drum head having communication holes fixed to the upper end of the drum and presses the filtrate into the duct through the communication holes that match each other as the drum rotates. A multi-chamber drum filter using a wedge-shaped wire, which has a sealed filtered liquid suction chamber in which all ducts communicate through connecting holes.