JP3824085B2 - Center valveless suction filter - Google Patents

Description

In the present invention, a suspension tank, especially a pulp suspension for fiber suspension and a rotary filtration drum are immersed in the suspension more than half a half, and the outer surface is covered with a wire cloth and a punching plate , The chambers have axially extended chambers, each of which is arranged in a spiral shape as a tapered suction pipe on a center drum that rotates together with each discharge, and is ejected to the center drum. The collected filtrate is sealed with a doctor with a synthetic resin cutting edge at the tip held by the center pipe that is fixed through the center drum, and the filtrate flowing through the center drum is from one or both. the structure was also fiber mat attached to the rotary drum filter, such as to flow out through the gate provided the sealing box where drained Each chamber taking the shortest distance through the suction pipe air rapidly pushed out by filtrate entering the wire cloth and as rotary filtration drum chamber is guided to the doctor attached to the center pipe, which is fixed by being compressed from Part It has been improved so that it can be dispersed and lifted from the inside so that it can be easily peeled off. By increasing the number of rotations of the cylinder and processing it and collecting the filtrate at the center, the driving horsepower is minimized and the structure is simple. Sealing both sides of the cylinder creates buoyancy that is nearly twice that of its own weight, reducing the operating weight and eliminating the need for a suction leg.
Since the structure is simple, the material cost is low, and it is easy to respond to changes in the inlet concentration from pulp fibers with high drainage to low ones. Assembly can be made cheaper by installing jigs and tools at the floor, and the suction pipe is vertical at the highest position so that the outlet concentration is high and the inlet concentration is high, and the processing capacity is also increased. Also, even drum extracts that do not require so much outlet concentration can be used at low cost because the drainage concentration is reduced by sheet formation and the structure is simple.
Next, a preferred embodiment of the present invention will be described as an example. The drawing shows a center valveless suction filter A according to the present invention, in which 1 shows a turbid tank made of SS for holding a pulp suspension, and this turbid tank 1 passes through a guiding wall 2 and has a substantially semi-cylindrical bottom 3. And a semi-cylindrical wall 6 perpendicular to the side walls 4 and 5 and an end wall 7 which is generally parallel to the side walls 4 and 5 . Rotary filtration drum 9 is provided by dipping or half此of Nigoso 1 on the rotary drum filter 9 to form a fiber mat 12, the fiber mat draw roller 13 or similar device, oblique rotary filtration drum 9 In the upper part, the fiber mat 12 is peeled off along the chute 14 with the help of compressed air of the infiltrated drainage liquid led from the doctor 26 in the center drum 20 through the suction pipe 19 from the inside of the rotary filter drum 9. Will be carried away.
Next, the wire cloth 16 from which the fiber mat 12 has been peeled off is cleaned by the eyewash shower 15. Then the rotary drum filter 9 begins to penetrate rapidly to a suspension of Nigoso 1, each outer circumference of the rotating filtering surface of the filtrate wire cloth 16 begin to form a fiber mat 12 is rotated filtration drum 9 of the drum 9 The outlet formed by each one of the apertures 18a provided in a large number of small chambers 18 that are partitioned in parallel with the shaft passes through the suction pipe 19 with a rectangular chute to taper in the suction pipe 19 one after another. And jetted to the center drum 20. Air expelled by the filtrate which enters through the reverse course center drum 20 inside provided with the used in the balloon by a doctor 26 also penetrates the filtrate rotary filtration drum 9 surface begins to flow into the center drum 20 at the lowest portion As the fiber mat 12 increases in thickness, the filtrate that has entered the center drum 20 as it rotates rotates from the window 21 at the end of the center drum 20 on one or both sides to the seal box 23 through the drain tank 22 and is filtered by the gate 24. To the seal box 23 . Further, a fiber mat 12 is attached to the surface of the rotary filtration drum 9 , but only one opening 18a of each chamber 18 provided in the chamber 18 of the rotary filtration drum 9 is sequentially arranged in a spiral shape. the rotary drum filter 9 fiber mat 12 flows into the highest filtrate rapidly cause vacuum stagnation without center drum 20 directly above the tip rotating filtration drum 9 from the suction pipe 19 of the tapered increasing the degree of vacuum in accordance with the rotation of the Maximize the concentration.
Next window filtrate flowing out to the center drum 20 is provided on one or both sides of the center drum 20 through the remaining portion excluding the compressed air portion divided into a doctor 26 which is attached to the center pipe 25 fixed at both ends 21 It is discharged to the seal box 23 through the drainage tub 22 , stopped and discharged by a pipe. The center pipe 25 with the doctor 26 in the center drum 20 is fixed at both ends 27 and 28. The center drum 20 is supported by plane metals 29 and 30 provided at both ends, and is driven by a driving device 31. The center drum 20 which rotates together with the rotary drum filter 9 is water-sealed by the gland packing 32 and 33 of each two-piece on either side of the side frame, and is water-sealed with the seal box 23 in a gland packing 34. Further, the rotary filter drum 9 is sealed with rubber packing 35 and a SUS decorative plate in a state where it is reinforced with unequal side mountain steel that intersects at right angles with the center drum 20 at both ends so as to generate buoyancy.
Then center pipe suction device, the filtrate by holes or windows 37 between the partition 36 attached to the lower horizontal portion of the doctor 26 fitted with a filtrate entering the suction pipe 19 as the center drum 20 to the center pipe 25 to the center pipe 25 By flowing out and limiting the amount of filtrate flowing out to one or both sides of the center pipe 25, it is possible to respond to changes in the freeness, inlet concentration and flow rate.
[Brief description of the drawings]
FIG. 1 is a partially cutaway front view of an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line BB of FIG.
3 is a schematic plan view of the rotary filtration drum of FIG . 1. FIG.
4A is a front view of a suction pipe, and FIG. 4B is a plan view of the suction pipe.
5 is a longitudinal sectional view of a center drum and a center pipe in FIG . 1. FIG.
6 is a cross-sectional view of a window, a gate, and a seal box at the end of the center drum in FIG . 1;
7 is a front view of the center pipe and doctor of FIG . 1. FIG.
8 is a schematic cross-sectional view of the center drum in a state where the suction pipe of FIG . 1 is attached.
[Explanation of symbols]
1, Turbid tank
2, guide wall
3, almost semi-cylindrical bottom
4,5, sidewall
6, semi-cylindrical wall
7. End wall
9. Rotary filtration drum
12. Fiber mat
13. Fiber mat drawing roller
14. Shoot
15. Eye wash shower
16, wire cloth
18, small chamber 19, suction pipe 20, center drum 21, center drum end window 23, seal box 24, gate 25, center pipe 26, doctors 29 and 30, plain metal 31, drive device
32, 33, 34, gland packing
35. Rubber packing and decorative plate
36, bulkhead
37, hole or window

Claims (2)

A rotary filtration drum is provided so as to be immersed more than half in the suspension of the turbid tank, and the rotary filtration drum extends in the axial direction on the outer surface and is covered with a wire cloth and a punching plate, each having a single discharge. And a center drum that rotates together with the rotary filtration drum. The center drum is sequentially arranged in a spiral shape, and suction pipes are provided so that the filtrate that has passed through each of the chambers is contained in the suction chamber. A pipe is ejected to the center drum, and a fixed center pipe is disposed through the center drum. A doctor is attached to the center pipe, and the filtrate collected in the center drum is supplied to the doctor. Sealed and separated from the compressed air part, the filtrate of one or both of the center drums A seal box is provided where the water filtrate is sealed, air pushed out by the filtrate from entering the each suction pipe with rotation is used in the balloon is guided to the doctor said via said suction pipe A center valveless suction filter, wherein a fiber mat dispersed in each small chamber and attached to the outer surface of the rotary filtration drum is lifted from the inside and peeled off. And a hole or window filtrate entering the suction pipe as a center drum between the lower and horizontally with a bar of the doctor attached to the center pipe, the filtrate is to flow out to the center pipe, from single side or both sides of the center pipe The center valveless suction filter according to claim 1, further comprising a center pipe suction device configured to be able to control the flow rate of the filtrate in a controllable state .

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