DE8008616U1 - SELF-EMPTY SPIN DRUM - Google Patents

Description

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Self-emptying centrifugal drum

for the purpose of solids ejection

for purposes

of the solids ejection is at full speed of the

Drum from the compartments of the locking chamber via liquid-controlled Centrifugal valve closing liquid drained and thus the bottom pressure below the piston valve is reduced. The piston slide then moves under the pressure of the drum filling into the opening position exposing the ejection openings lung.

Depending on the type and consistency of the solids to be separated, it can be advantageous to carry out so-called partial emptying at shorter intervals or to carry out total emptying at longer intervals. When performing partial evacuations

The innovation relates to a self-draining centrifugal; drum with a piston valve delimiting the separation and solids space on one side to control the ejection openings in the drum

jacket, which can be used to carry out partial or total |

emptying permitted, with the closing chamber in several radial,]

one behind the other, connected by canals departments un- \

is divided and can be filled with sealing liquid, \

and wherein at least in the discharge channel of the outer closing chamber division arranged a liquid-controlled centrifugal valve

is that opens under hydration. _;

A centrifugal drum of this type is known from DE-OS f 27 Ok 903 and has two one behind the other, over |; closable channels connected closing chamber compartments, which are arranged between the piston slide and the adjacent drum part and are filled with a closing liquid before the start of the centrifugal operation. The closing chamber, which consists of the two closing chamber sections, has a greater radial extent than the interior of the drum, so that when the chamber is completely filled, the closing pressure acting on the piston valve from this side is greater than the pressure of the drum filling acting in the opening sense from the other side.

the drum opened only slightly and for a short time, whereby
preferably from the outer locking chamber department via one.
liquid-controlled centrifugal valve closing liquid
is drained. With partial emptying, only part of the
Solids collected in the solids chamber are ejected, while the remaining solids content remains in the drum as a safety ring. This prevents that with the solids
a large amount of centrifugal fluid, which is often a useful fluid, is ejected and lost.

Since only the outer compartment of the closing chamber is emptied of closing liquid during partial emptying, the opening time and opening width of the self-emptying drum are limited, since the closing liquid remains in the other compartment of the closing chamber. As soon as the free liquid level in the separation space has receded so far after the onset of the solids ejection that the opening pressure is less than
the closing pressure of the closing liquid remaining in the closing chamber, the piston slide immediately moves back into
Closed position. The greater the closing pressure of the closing liquid retained in the closing chamber, the faster the drum closes again and the fewer solids
are ejected with every opening process.

In the case of total emptying, not only is the known design the outer, but also the inner locking chamber department is emptied, including one in which the two locking chamber departments are located fluid-controlled <3 Centrifugal valve acting on the collar of the centrifugal valve lying liquid pressure opens and also the drainage channel for emptying the inner closing chamber compartment | releases as soon as the outer locking chamber department is emptied.

In the case of partial emptying, the outer locking chamber section is used in this design and in the case of total emptying, both the outer and inner closing chamber compartments are emptied. During these emptying processes as long as there is residual pressure in the locking chamber compartments on the piston valve, like locking fluid

is available in the respective locking chamber departments. The emptying process of the two departments is with the total emptying particularly sluggish, since the closing liquid from the inner closing chamber compartment also initially flows through channels must be passed into the outer chamber before it is discharged from the drum. This creates the outer chamber over a long period of time under high fluid pressure. A quick emptying of the locking chambers is necessary in order to to achieve a quick and wide opening of the discharge gap for the solids, so that first of all the gap in the solids space Solid and only then the remaining useful liquid is discharged.

With a sluggish opening of the drum there is a risk that the Useful liquid due to the breaking during the emptying process Solids ring in the solids space is first discharged and then residual proportions of solids remain in the drum, which too can lead to a dangerous imbalance of the drum. To avoid this risk, the opening process must be a fraction one second, which is not possible with the design of the known centrifugal drum.

The innovation is based on the task of designing a self-draining centrifugal drum of the type mentioned so that both Faster partial as well as total emptying carried out can be.

The object is achieved in that for total emptying the periphery of the centrifugal drum one or more drain valves are provided, each starting with drain channels from the radially outer end of the inner and outer locking chambers division, connected, and for performing partial evacuations one or more drain valves are arranged on the periphery of the drum, the drain channel with one of the inlet the outer closing chamber division outgoing channel and one extending from the radially outer end of the inner closing chamber division Channel is connected and this “the inner one with the

outer closing chamber division connecting channel, a throttle point having.

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I By arranging separate drain valves for the to-

I oil and partial evacuations are the

I inner and outer locking chamber department by the shortest route

f emptied of closing liquid very quickly, whereby the closing

H pressure below the piston valve reduced just as quickly; will. When performing partial evacuations, the

■ f Throttle point, in which the two locking chamber compartments ver ~

< ^! binding channel, the fluid connection between the two

I demolished lock chamber compartments as soon as the drain valve opened

i has emptied the associated drainage channel, causing a strong pressure

waste occurs in the outer locking chamber department and the! Brings the piston valve into the open position very quickly. Since, on the other hand, below the piston valve in the outer closing '·. chamber department a residual closing pressure through the below the

Piston valve present in this chamber liquid; remains, the piston valve goes back into the very quickly

} Return to starting position. Very little is used in this process

i Closing liquid discharged from the closing chamber. Depending on

I position of the throttle point, the closing pressure can be

I ent leerungs before transition to more / o be mined as 50 °.

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; An exemplary embodiment of the innovation is given in the following

? hand of the drawing described in more detail.

In the drawing, 1 is the one equipped with a plate insert Separation space and 2 denotes the solids space, which is on the top of a drum cover 3 and on the lower

; ' side are limited by a piston valve k, the

The piston valve with its axial movements the outlet opening

: gene 5 opens in the drum part 6 for the outlet of the solids and

closes. Drum part 6 and drum cover 3 are through a Lock ring 7 held together.

Between the piston valve 4 and the adjacent drum part 6 is the locking chamber, which in the embodiment

¹ in two radially one behind the other and facing each other

I sealed compartments, the inner lock chamber compartment 8 and

the outer locking chamber department 9 »is divided into which

₄ the piston valve k except for the usual guides at 10

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and 10 * additionally at 11 on the adjacent drum part 6

a sealing ring 12 is sealed and guided. |

To carry out total evacuations, drainage channels 13 and 1 ^ which are opened and closed by a drain valve 15 go from the radially outer end of the inner closing chamber division 8 and the outer closing chamber division 9. These drain valves block the drain channels during operation under the action of centrifugal force. The function of such valves has become known, for example, from US Pat. No. k 0 $ k 2kk.

To open the drain valve is a supply line 16 and Annular channel 17 control fluid through a channel 18 to the valve forwarded.

To carry out partial evacuations, discharge channels 19, designed as annular channels, extend from the entrance of the outer closing chamber compartment 9 and open into an annular channel 20 which is assigned to a discharge channel 22 connected to the discharge valve 21. One or more outlet channels 23 with a throttle point 2k arranged in this channel and which open into the annular channel 20 extend from the radially outer end of the inner closing chamber compartment 8.

The discharge channels with the throttle point can be arranged in the piston valve k or also in the drum part 6, where they are denoted by 23 'and 2k ^n. For the control of the drain valve 21, which also acts under centrifugal force, control fluid is fed to it via feed line 25, annular channel 26 and channel 27. The closing chamber is filled with closing liquid via supply line 28, annular channel 29 and channel 30.

The function of the self-cleaning centrifugal drum is as follows:

In the event of total emptying, control fluid is fed to the centrifugal drum via feed line 16 via annular rail 17, with the Liquid flows through the channel 18 and, under the action of the liquid pressure prevailing in this channel, the drain valve 15 opens. Through drainage channels 13 and 1 ^, percussive empties

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like the iiraere and outer shooting chamber department 8 and 9 »so that the piston valve k moves the piston valve axially into the lower open position under the action of the overpressure prevailing in the separating and solids chamber 1 and 2 and the drum filling is ejected through the discharge gap 5. For total emptying, one or more drain valves 15 with the corresponding drain channels 13 and Ik can be arranged. For the closing process, closing liquid is fed into the annular channel 29 via the feed line 28 and the closing chamber compartments 8 and 9 are refilled.

In order to carry out partial evacuations, control fluid is fed to the channel 27 via the feed 25 »annular channel 26, the fluid pressure prevailing in this channel opening the drain valve 21. Under the action of centrifugal force, the drainage channel 22 and the annular channel 20 are suddenly emptied, the fluid connection through the throttle point 2k between the inner and outer closing chamber compartments 8 and 9 being broken, since less closing fluid flows in from the throttle point 2k than is drained through the drainage channel 22 and drain valve. As a result, the liquid pressure in the outer closing chamber compartment 9 is reduced very quickly, so that the piston valve k moves axially downwards under the effect of the pressure prevailing in the separation and solids space 1 and 2 and a certain filling of the drum is discharged through the outlet openings 5. However, since the liquid ring and thus a certain liquid pressure is maintained in the outer closing chamber compartment 9, the piston slide k is brought back very quickly into the upper closed position. The opening path of the piston valve is less than with total emptying.

The liquid discharge during partial emptying from the closing chamber is very low, since essentially only the closing liquid from the channel 22 and the annular channel 23 from the drum is carried out. During the downward movement of the piston valve, only part of the area below the piston valve in the liquid present in the outer closing chamber compartment is displaced into the annular channel 20 previously emptied below. Depending on

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Position of the throttle point 2k and the separation zone 11 between the inner and outer closing chamber compartments 8 and 9 , the pressure drop in the outer closing chamber compartment can be more than 50 % .

For the closing process, therefore, only very little closing liquid is required after partial emptying, via the supply line 28, ring channel 29 and channel 30 of the closing chamber is fed, for the implementation of partial evacuations can also be a or a plurality of drain valves 21 with corresponding drain channels 22 are provided.

It is also conceivable to provide more than two locking chamber compartments. The total and partial emptying processes can be carried out via a control device (not shown). The total emptying process can also be combined with a partial emptying process, whereby the emptying process is even faster can be carried out.

Claims (8)

PROTECTION CLAIMS 1) Self-emptying centrifugal drum with a piston valve delimiting the separation and solids space on one side to control the ejection openings ißi drum shell, which allows the implementation of partial or total emptying, whereby the closing chamber is divided into several radially one behind the other, connected via channels and charged with closing liquid can be, and at least in the discharge channel of the outer closing chamber compartment a liquid- controlled centrifugal valve is arranged, which opens when liquid is supplied , characterized in that one or more discharge valves (15) are provided on the periphery of the centrifugal drum, which are provided with discharge channels (13 » 1 * 0> each starting from the radially outer end of the inner and outer closing chamber compartments (8, 9), and one or more drain valves (21) are arranged on the periphery of the drum for carrying out partial evacuations nal (22) is connected to a channel (19) emanating from the entrance of the outer closing chamber division and a channel (23, 23 ') emanating from the radially outer end of the inner closing chamber division, and this channel connecting the inner and outer closing chamber division has a throttle point ( 24, Zk *) . 2) Self-emptying centrifugal drum according to claim 1, characterized in that that the discharge channel (22) is assigned an annular channel (20). 3) Self-emptying centrifugal drum according to claim 1 and 2, characterized characterized in that the drainage channel (I9) of the outer Closing chamber department (9) is designed as an annular channel. k) Self-emptying centrifugal drum according to claims 1 to 3 »characterized in that the annular channel (19) opens into the annular channel (20). 5) Self-emptying centrifugal drum according to claim 1 to k, characterized in that the discharge channel (23) opens into the annular channel (20). 6) Self-emptying centrifugal drum according to claim 1 to 5, characterized in that the discharge channel (23) with a throttle point (2k) extending from the inner closing chamber section (8) is arranged in the piston slide (k) . 7) Self-emptying centrifugal drum according to claim 1 to 5, characterized in that the discharge channel (23 ¹ ) with a throttle point (2h ') extending from the inner closing chamber division (8) is arranged in the adjacent drum part (6). 8) Self-emptying centrifugal drum according to claim 1 to 7, characterized in that the inner closing chamber compartment (8) is sealed off from the adjacent drum part (6) by a sealing ring (12) arranged in the piston slide (k).