DE6610766U - CANDLE FILTER. - Google Patents

Description

R. Putsch & Co., Maschinenfabrik Hagen / Westf.

Candle filter

The present invention relates to a candle filter its filter candles on an intermediate plate that divides the filter vessel into a sludge chamber and a Filtratraura arranged hanging and with longitudinally running pipes, are provided and arranged one ara bottom of the filter vessel Has discharge opening for the filter residue.

Candle filters of this type are known. They are used for the filtration of liquids with solid suspensions, the so-called turbidity, whereby special emphasis is placed on obtaining as dry a filter residue as possible. The candle filter eggs known l \ rt are arranged so that after completion of filtration, for example, because he "creation of the residue capacity äugelassen still ira filter vessel remaining Besttrübe. and the mostly ssit-

- 2 6610766 11.03.76

a quick release hinged lid of the discharge opening can be opened. The residue that has accumulated on the surface of the filter candle is then removed from the filtrate thrown here by a blast of compressed air and falls through the discharge opening into a transport container or on a conveyor belt. So that this arrears not prematurely from falls off the filter candles, it is known during the emptying of the residual sludge in the sludge space opposite the filtrate space to maintain an overpressure. This is, for example, by creating a negative pressure on the Filtrata outlet possible, whereby the pulp space of the filter vessel can be connected to the outside atmosphere. Another possibility between the pulp space and the filtrate space A pressure difference can be established by introducing compressed gas or compressed air into the pulp space when it is free Given the filtrate outlet. In this way, the residue can optionally also be washed before it is thrown and / or subjected to a drying process without a premature drop in the residue is to be feared.

However, the known candle filters with hanging filter candles have the disadvantage that when the filter vessel is emptied a large amount of residual turbidity corresponding to the content of the pulp space accumulates, which is stored in the pulp storage vessel must be returned. Another major disadvantage is that the filtrate still present inside the filter candles when emptying the pulp space from the filter candle into the

6610766 03/11/76

Turbidity space flows back, with the back standing! chi ent again moistened and in some cases even prematurely detached from the filter candle surface ..

The object of the present invention is to provide a candle filter to create a completely dry filter residue and the residue that accumulates during emptying The residual amount of cloudiness is extremely small.

This is achieved according to the invention in that the tubes running through the filter candle are designed as riser tubes are as well as at their bottom end at least have a backflow in the sludge chamber blocking check valve and that the filter candles in their on the Intermediate plate attached head part with at least one the Filtratraura with the ventilation valve connecting the candle interior are equipped.

It is also advantageous if the check valve

is arranged so that - its inlet opening in the filter interior
Kerzerjraum below the forming the filter candle wall

permeable filter medium lies.

It is also useful if the check valve and the ventilation valve are spring-loaded ball valves are formed and the contact pressure of the valve balls is adjustable.

8610768 03/11/76

—— ι

The following is for further explanation and i For better understanding, an exemplary embodiment of the invention is described and explained in more detail in the drawings.

Fig. 1 shows a section through the entire filter vessel arrangement and

Flg. 2 shows a section through a single filter candle .

As shown in FIG. 1, the filter vessel arrangement consists of a vertical filter vessel 1 which is closed on its upper side with a cover 2. An intermediate plate 3 is inserted between the filter vessel 1 and the cover 2 in such a way that it divides the entire interior space into two mutually closed spaces, a small iron filtrate space 5 and a larger pulp space k . The lower end of the filter vessel 1 is formed by a hinged cover 7 provided with a cord 11 closure and seal, which can be swiveled down and in the open state 8 releases a discharge opening 9 for the filter residue Io. One or more filter candles are suspended from the intermediate plate 3 in such a way that their filter medium side protrudes into the pulp space 4-.

The pulp is fed in through / with a valve 11 provided nozzle 12 which is welded to the wall of the filter vessel 1. The before the start of the filtration at

8610766 03/11/76

ϊ. Filling the filter vessel 1 displaced air escapes through

I a nozzle arranged just below the intermediate plate 3

f 13, the outside of the boiler with a valve 14 and a

t valve 21 is in communication.

? During the filtration, the liquid phase occurs

• r pressurized turbidity as a filtrate diareh the filter

'■ medium 15 of the filter candle 6 hindursh, while the fixed

J parts of the sludge on the surface of the filter medium 15

«Be retained and accumulated there as residue Io.

j The filtrate flows in the candle interior 16 of the filter candle 6

J 'down to then through an opening 22 one

i Check valve 17 in a located in the cement of the candle 6

• Ordered riser pipe 18 to arrive. The riser pipe 18 runs

1 through one for attaching the filter cartridge 6 to the intermediate

^! plate 3 provided head part 25 and thus represents a

{■ Connection between the candle interior 16 and the filtrate

ι ~ "room 5. The filtrate then leaves the filtrate chamber 5

f. a connector 19 welded to the cover 2 with a valve

\ tii 2o.

Should the piltration process be interrupted because The removal of the residue Io on the filter candles 6 has become necessary, the first step is the inflow of pulp blocked by closing the valve 11. At the same time, by opening the valve 21 via the nozzle 13, pressurized gas or compressed air is passed into the pulp space 4. This print

8610766 1103.78

gas presses on the mirror of the residual turbidity and drives it

AQ> liquid phase as ¹ filtrate into the interior / the filter candle

The same effect can be achieved when on your neck and

of the filtrate space 5 a negative pressure is applied / by

the open valve Ik of the nozzle 13 protruding into the pulp space can flow in air. Since the check valve in the interior 16 of the filter candle 6 is arranged so that an inlet opening 22 of the check valve is below the permeable filter medium 15 forming the filter candle wall, the filtrate of pressurized gas located in the candle interior 16 is practically completely into the riser pipe 18 and thus into the filtrate space 5 pressed. In this way it is possible to largely filter off the residual sludge and to keep the return flow very small when the boiler is subsequently emptied. Also, the residue Io deposited on the outside wall of the candle is not re-moistened or even detached by the filtrate flowing back.

For jettisoning, the residue Io of the filter candles then opened state 8 of the hinged lid 7 is passed through a pipe 24 intermittently by a slide 23 compressed air into ^ij · the filtrate. 5 The compressed air then passes through

the ventilation valve arranged in the head part 25 of the filter candle 6 26, which inevitably occurs during the filling process is closed, into the candle interior 16 and flow through it Filter medium 15 from the inside to the outside. Through this

6610766 1103.76

/ 10

■ is deposited on the outside of the filter medium 15 Residue Io is thrown off and falls through the discharge opening in a transport container provided or on a conveyor belt.

The contact pressure of the valve balls of the return valve j tisji. 17 and the ventilation valve 26 can be through the Feöerpjsannunn; ^ Plug changing threads or adjust them by inserting washers »

66107B6 03/11/76

Claims (2)

1. Candle filter * whose filter candle on one of the filter bowl in '. an intermediate plate which divides a filtrate space and is provided with longitudinally running pipes ,,, and which has a discharge opening for the filter residue located at the bottom of the filter vessel, characterized in that the pipes running through the filter candle (6) act as riser pipes (18) are formed.sewie have at their bottom edge at least one non-return valve (1?) Blocking the return flow in the sludge space the filtrate chamber C) are equipped with the ventilation valve (26) connecting the inner chamber (16) » 2. candle filter according to claim 1, characterized in that that the check valve (17) is arranged so that its inlet opening (22) in the filter candle interior (l6) below of the permeable which forms the filter candle wall Filter means (15) lies. 3 »candle filter according to claim 1 and 2, characterized in that that the check valve (1?) and the ventilation valve (26) are designed as spring-loaded ball valves. - 2 - 6610766 03/11/76