EP3720611A1

EP3720611A1 - Separator drum

Info

Publication number: EP3720611A1
Application number: EP18819007.8A
Authority: EP
Inventors: Thomas König
Original assignee: Flottweg SE
Current assignee: Flottweg SE
Priority date: 2017-12-05
Filing date: 2018-12-03
Publication date: 2020-10-14
Anticipated expiration: 2038-12-03
Also published as: US20200391226A1; US11541402B2; WO2019110465A1; DE102018104700A1; EP3720611B1

Abstract

The invention relates to a separator drum (10) with a hydraulically actuated, axially movable piston slide valve (20) which can seal off a solids space (14) from at least one solids outlet (18), wherein the piston slide valve (20) can be held in its closed position via a closing chamber (30) that can be filled with closing liquid, in particular closing water, wherein the closing chamber (30) is formed between an underside (21) of the piston slide valve (20) and a top side (35) of a drum lower part (15). According to the invention, the closing chamber (30) has a first closing chamber portion (31) near the rotation axis (R) and a second closing chamber portion (32) remote from the rotation axis (R), wherein the first closing chamber portion (31) is formed by two mutually parallel portions (22, 36) of the underside (21) of the piston slide valve (20) and of the top side (35) of the drum lower part (15), and the second closing chamber portion (32) has at least in part a conical cross section.

Description

separator

description

The invention relates to a separator drum with a hydraulically actuated, axially movable piston slide which can seal a solids space against at least one solids outlet, wherein the piston valve can be held in its closed position via a closing chamber which can be filled with closing fluid, in particular closing water, the closing chamber being located between an underside of the closing chamber Piston slide and a top of a Trommeluntertei ls is formed, according to claim 1.

Separator drums or centrifugal drums for centrifuges are well known from the prior art. Furthermore, it is known to carry out partial emptying or full emptying in connection with such separator drums. There are a variety of embodiments of this

Separator drums known to have control systems with chambers that receive the entire closing liquid at a full emptying and at

Partial discharges are prefilled.

In general, the opening and closing of a separator drum is based on moving a piston valve up and down. The spool is part of a hydraulically controlled system. The up and down movement of the piston valve is achieved by different pressure conditions, the different pressure conditions from different levels of the mirror liquid in the closing chamber of the drum during the

Emptying process result. If closing fluid from the

Closing chamber is lowered, the spool falls down so that the separator drum is opened. A solids outlet of the solids space is released by movement of the piston slide down. In connection with such opening systems exists a so-called virtual diameter (Dl), at which - purely mathematically - in normal operation, a balance between the opening force resulting from the drum filling, and the closing force, due to the located in the lock chamber

Closing liquid results prevails. If the closing fluid level is smaller than D1, the drum is closed. If the closing fluid level is greater than D1, the drum is open. This relationship applies to all hydraulic opening systems of separator drums.

In order to achieve a quick emptying or partial emptying of the separator drum, the piston valve must then be quickly moved back up after release of the solids outlet. The movement of the piston valve depends, among other things, on how fast so-called

Drum valves can be closed again. To open drum valves, a certain opening liquid level is necessary. This

Liquid level is within holes or channels of a

Opening liquid trap chamber formed to the drum valves of the separator drum.

The diameter at which there is equilibrium between an open drum valve and a closed drum valve in normal operation is also approximately in the range of the diameter Dl. In general, here applies that with an opening liquid level is less than Dl, the valve is open. With an opening fluid level greater than Dl, the valve is closed.

Previously known constructions with regard to the opening of separator drums have the disadvantage that, on the one hand, no influence can be exerted on the running closing liquid and, on the other hand, the amount of

necessary closing liquid is relatively large, so that it takes a relatively long time until the closing liquid level exceeds the diameter Dl and there is an open separator drum.

Based on the described prior art, the object of the present invention is to provide a separator drum with an opening system, wherein the partial emptying of the separator drum in a shorter time to be carried out. Furthermore, it should be possible with the same separator drum and a full emptying.

This object is achieved by the subject matter of claim 1, wherein the dependent claims comprise at least expedient refinements and developments.

It is therefore assumed that a separator drum with a hydraulically actuated, axially movable piston slide, which can seal a solids space against at least one solids outlet, the piston valve via a closing liquid, in particular closing water, fillable lock chamber is preserved in its closed position, wherein the closing chamber between a Bottom of the piston valve and an upper side of a drum base is formed.

According to the invention, the closing chamber has a first closing chamber section close to the rotation axis and a second closing chamber section remote from the rotation axis, wherein the first closing chamber section is formed by two mutually parallel sections of the lower side of the piston slide and the upper side of the drum lower part, and the second

Closing chamber section at least partially has a conical cross-section.

The axis of rotation relates to the axis of rotation of the separator drum. In other words, the first closing chamber portion is a closing chamber portion located further inward in relation to the second closing chamber portion. The second closing chamber portion is a closing chamber portion located farther outward in relation to the first closing chamber portion.

In other words, the lock chamber has at least two

Closing chamber sections on. These closing chamber sections are to be understood only as partial areas of the closing chamber. These are not fluidly separated sections. The first

Closing chamber portion is the portion of the closing chamber, which is arranged closer to the rotational axis of the separator drum. The second

Closing chamber portion is the portion of the closing chamber, which of the Rotary axis of the separator drum is arranged more remote. The first closing chamber section preferably adjoins the second closing chamber section.

The first closing chamber section is parallel to each other by two

arranged portions of the underside of the spool and the top of the drum base formed. Due to the mutually parallel sections, the first closing chamber section in cross section at a constant distance. The distance, when closed

Separator drum, d. H. is present at a closed position of the piston valve, it is relatively low. The distance is preferably 0.5 mm to 5.0 mm. The first closing chamber section is formed, in particular, in that the corresponding section of the underside of the piston slide is designed to be complementary to the corresponding section of the upper side of the drum lower part.

The second closing chamber section has, at least in sections, a conical cross section. As a conical cross section is such

Cross-section to understand that is at least partially conical. A corresponding cross-section is at a section through the

Separator drum from top to bottom in front.

Due to a conically shaped cross-section, a second closing chamber section can be formed with an increased chamber volume compared to a cross-section, which is formed due to a constant distance between the underside of the piston valve and the upper side of the drum base.

Preferably, the second closing chamber portion is formed by two angularly arranged to each other portion of the underside of the piston valve and the top of the drum base.

The two angularly arranged sections of the bottom of the

Piston slide and the top of the drum base preferably close an angle of 10 ° - 45 °, in particular from 15 ° - 40 °, in particular from 17 ° - 35 °, in particular from 18 ° - 30 °, in particular from 19 ° - 25 °, in particular from 20 °, a. The conical cross section is preferably formed such that the portion with a smaller cross section points in the direction of the first closing chamber section. The section of the second closing chamber section with the smallest

Cross section preferably adjoins the first closing chamber section. In order to form a second closing chamber section with a conical cross section, the underside of the piston slide and the top of the

Drum lower parts in this area not parallel to each other, but at an angle to each other.

The ratio of the closing liquid volume in the first closing chamber section to the closing liquid volume in the second closing chamber section is preferably from 1: 5 to 1:15, in particular 1:10.

The separator drum, in particular the closing chamber, is designed in such a way that the closing fluid portion, which is smaller than the virtual diameter D 1, is relatively small. A small amount of closing fluid in the range of the virtual diameter Dl has a positive effect on the speed of the

Opening process during emptying of the separator. It is thus possible that the inner Schließflüssig keitsspiegel, d. H. the

Closing liquid level in the first closing chamber portion, very quickly exceed the virtual diameter Dl to the outside.

The first closing chamber section is preferably formed in the region of the virtual diameter D 1. The virtual diameter Dl is, as already mentioned, the virtual diameter at which a mathematically equilibrium exists between the opening force through the drum filling and the closing force through the closing fluid in the closing chamber. Alternatively, it is possible that the transition region from the first

Closing chamber portion is formed to the second closing chamber portion in the region of the virtual diameter Dl.

In a particularly preferred embodiment of the invention, the virtual diameter Dl is formed approximately in the center of the first closing chamber section. The closing fluid portion which is larger than the diameter Dl is relatively large. This is due to the conical cross section of the second

Lock chamber section allows.

The separator drum has at least one drum valve. Preferably, the separator drum comprises at least two drum valves. The number of drum valves can be both even and odd.

A drum valve is used to drain closing fluid. Between the first closing chamber section and the at least one drum valve, a first outflow channel is formed. Between the second closing chamber portion and the at least one drum valve, a second outflow channel is formed.

Preferably, the inner diameter of the first outflow channel is greater than the inner diameter of the second outflow channel.

The closing fluid contained in the closing chamber can be passed to a drum valve due to the two outflow channels. In other words, the closing fluid can be formed separately due to two

Outflow channels are drained in the direction of the drum valve.

In the second outflow channel, a nozzle is preferably formed. This second outflow channel is the channel with less

Inner diameter. The second outflow channel may have an inner diameter of 0.5 mm - 5.0 mm.

The inventive design of the separator drum with the two

Outflow channels has the advantage that the relatively low

Closing fluid amount of the first closing chamber portion via the first outflow with a relatively large inner diameter, can be forwarded directly to at least one drum valve and then extremely fast on the at least one drum valve from the rotating

Separator drum can be drained. Because of this, the spool can be moved extremely quickly to the bottom. The relatively large amount of closing fluid, which in the second

Closing chamber section is, at the same time on the second

Outflow channel having a relatively small inner diameter, passed to the at least one drum valve.

Due to the relatively small inner diameter of the second outflow channel and the preferred formation of a nozzle, the outflow of the closing liquid is delayed such that the at least one opened drum valve is already closed again before the complete discharge or outflow of the closing liquid.

One during a partial emptying permanently refilled from the outside

Closing fluid fills the outflowing or drained closing water or the closing fluid, at the same time again.

As a result, the spool valve which is in the lowest position during the emptying process is pressed upward again after a relatively short time, so that the separator drum is closed again. In other words, the solids outlet of the solids space can be re-sealed due to the piston slide pushed upwards. In particular, a complete or too long drainage of the closing liquid is prevented due to the formation of two closing chamber sections and the associated formation of two outflow.

The ratio of the inner diameter of the first outflow channel to

Inner diameter of the second outflow channel is preferably 1: 3 to 1:15.

An opening of the second outflow channel is preferably formed in the region or in the vicinity of the largest diameter of the closing chamber. This makes it possible that the largest proportion of the closing liquid located in the first closing chamber section flows out through the first outflow channel and the closing liquid located in the second closing chamber section likewise flows out, in particular simultaneously. For example, the second outflow channel is formed perpendicular to the first outflow channel. In other words, the two outflow channels are arranged at right angles to each other. Preferably, the second outflow channel is formed in the vertical direction. The first outflow channel is preferably formed in the horizontal direction. The second closing chamber portion preferably ends in an outer portion having a horizontal end surface.

Preferably, the second outflow channel is formed perpendicular to this horizontal end surface. The opening of the second outflow channel is preferably formed in the horizontal end surface.

In a further embodiment of the invention, it is possible that the

Outflow channels are formed obliquely to each other.

The outflow diameter of the first closing chamber section may be greater than or equal to the virtual diameter. In other words, the measure of the outflow diameter of the first closing chamber section can be greater than the measure of the virtual diameter. In addition, the degree of the

Abströmdurchmesser have approximately the same dimension as the virtual diameter.

Due to the formation of the separator drum according to the invention, a separator drum is provided whose opening times of the

Spool valve is shortened compared to the prior art. Furthermore, the switching times of the drum valve of the separator drum can be shortened.

The invention is explained in more detail below on the basis of exemplary embodiments with reference to the accompanying schematic drawings.

Show:

1 shows a cross section through a separator drum according to the invention;

FIG. 2 is an enlarged view of the area around the closing chamber according to a first embodiment of the invention; FIG. and Fig. 3 is an enlarged view of the area around the closing chamber according to a second embodiment of the invention.

The following will be the same for the same and equivalent parts

Reference numerals used.

It is a separator drum 10 is shown. This has a central inlet 11 for a solid-liquid mixture to be separated, via which the solid-liquid mixture passes into a centrifugal chamber 12. The

Centrifugal space 12 is composed of a separation space 13 and a solids space

14 together. The solids space 14 is formed as a double cone au and limited in its lower part by a piston valve 20.

The separator drum 10 is closed in its upper region with a drum cover 16, which by a closure ring 17 with a drum base

15 is connected. The piston slide 20 can close or release an outlet 18 provided in the drum base 15. In Fig. 1 is the

Piston slide 20 shown in the open position. The outlet 18 is

Approved. If the piston valve 20 is pushed axially upward within the centrifugal space 12, the outlet 18 can be closed.

The piston valve 20 is hydraulically actuated. For this purpose, a closing chamber 30 is formed, which can be filled with a closing liquid, in particular with closed water. Due to the level formed in the closing chamber 30, the spool valve 20 can be actuated. The closing chamber 30 is between the bottom 21 of the spool 20 and the top 35 of the

Drum lower parts 15 formed.

Since the piston slide 20 rests on the upper side 35 of the lower drum part 15 in FIG. 1, the complete closing chamber 30 can not be seen.

The closing chamber 30 has a first close to the rotation axis R first

Lock chamber portion 31 and a remote from the rotation axis R second closing chamber portion 32. The first closing chamber section 31 is formed by two mutually parallel sections (22, 36) of the underside 21 of the piston slide 20 and the upper side 35 of the drum base 15. With In other words, the portion 22 of the spool 20 and the portion 22 of the bottom 21 of the spool 20 parallel to the portion 36 of the drum base 15 and the portion 36 of the top 35 of the

Drum lower parts 15 formed. The distance between the sections 22 and 36 thus remains the same when the piston slide 20 is pushed upwards. Between sections 22 and 36, therefore, a substantially

hollow circular cylindrical first closing chamber portion 31 formed.

The second closing chamber section 32 has, at least in sections, a conical cross section. This conical cross section can be seen in Fig. 1, in which the spool 20 is in an open position. Even with a closed position of the spool 20, this conical cross section is maintained. The conical cross section is formed such that the dimension of the cross section decreases in the direction of the first closing chamber section 31. The second closing chamber portion 32 adjoins the first closing chamber portion 31.

The second closing chamber section 32 further has an outer section 33 with a horizontal end surface 34.

The second closing chamber portion 32 is formed by two angularly arranged portions. In particular, the second

Closing chamber portion 32 through the portion 23 of the bottom 21 of the

Piston slide 20 and the portion 37 of the top 35 of the drum base 15 is formed.

The two angularly disposed portions 23 and 37 of the bottom 21 of the spool 20 and the top 35 of the drum base 15 include an angle a of in particular 20 ° (see Fig. 2).

In Fig. 2, the closing chamber 30 and an associated drum valve 40 is shown enlarged according to a first embodiment. In Fig. 2, the spool 20 is shown in a slightly raised position. It can be seen that the closing chamber 30 in particular from the two

Closed chamber sections 31 and 32 is formed. Between an im

Substantial vertical portion 24 of the spool 20 and a vertical portion 38 of the drum base 15, a gap-shaped portion 39 of the lock chamber 30 is formed.

In Fig. 2, the so-called virtual diameter Dl is located. At this virtual diameter Dl prevails arithmetically in normal operation

Balance between the opening force generated by the drum filling and the closing force generated by the closing liquid in the lock chamber 30. It can be seen that the

Separator drum 10, in particular the closing chamber 30, is formed such that the virtual diameter Dl in the region of the first

Closing chamber portion 31 is formed. In particular, the virtual diameter Dl is formed approximately in the center of the first closing chamber section 31.

In general, the separator drum 10 is closed if the closing liquid level is smaller than D1. If the liquid level is greater than Dl, the separator drum 10 is opened. The

Closing liquid content, which is smaller than the diameter Dl, is thus relatively low. Because of the conical cross-section of the second

Closing chamber portion 32 has a relatively large volume is the

Closing liquid content that is greater than the diameter Dl, relatively large.

In Fig. 2, a drum valve 40 of the separator drum 10 can be seen. Between the first closing chamber section 31 and the drum valve 40, a first outflow channel 41 is formed. Between the second

Closing chamber section 32 and the drum valve 40, however, a second outflow channel 42 is formed. The second outflow channel 42 is formed substantially perpendicular to the first outflow channel 41.

It can be seen that the inner diameter D3 of the first outflow channel 41 is greater than the inner diameter D2 of the second outflow channel 42. The second outflow channel 42 has in particular an inner diameter D2 of 1.5 mm. The opening 43 of the second outflow channel 42 is formed in the region of the largest diameter of the closing chamber 30. In particular, the opening 43 is formed in the horizontal end surface 34. In addition, it can be seen that the diameter D4, ie the

Outflow diameter of the first closing chamber portion 31, greater than the virtual diameter Dl is.

Due to the inventive design of the separator drum 10, in particular the piston slide 20 and the closing chamber 30, the following advantages result:

The relatively small amount of closing fluid in the first closing chamber section

31 can via the first outflow 41, which has a relatively large

Inner diameter D3, are passed directly to the drum valve 40. This proportion of the closing fluid can be discharged from the rotating separator drum 10 very quickly via this drum valve 40. Due to this, the spool 20 is moved down very quickly.

The relatively large amount of closing fluid in the second closing chamber section

32 is passed over the second outflow channel 42 at the same time. By contrast, this second outflow channel 42 has a relatively small inner diameter D 2. Due to this, the outflow of the downstream flows is delayed

Closing water such that the opened drum valve 40 before the

complete draining the closing fluid can be closed again.

To delay the drainage of the closing liquid portion from the second closing chamber section 32, a nozzle 44 is also formed in the second outflow channel 42.

The permanently refilled during a partial emptying from the outside

Closing fluid fills the drained closing fluid at the same time again.

The spool valve 20 which is located in the lowest position during the emptying process can thus be pushed upwards again after a relatively short time, in order subsequently to close the separator drum 10 or the outlet 18 again.

Due to this, the switching times of the drum valve 40 are massively shortened. As indicated in FIG. 2, the drum valve 40 is operatively connected to an orifice fluid system in a known manner. For this purpose, an opening liquid channel 45 is formed.

In Fig. 3, the closing chamber 30 and an associated drum valve 40 is shown enlarged according to a second embodiment. In Fig. 3, the spool valve 20 is shown in a slightly raised position. It can be seen that the closing chamber 30 in particular from the two

Closed chamber sections 31 and 32 is formed.

The embodiment of Fig. 3 differs from the embodiment of Fig. 2 initially in that the diameter D4, i. the

Outflow diameter of the first closing chamber portion 31 is (approximately) equal to the virtual diameter Dl.

The first outflow channel 41 in this context has two sections, namely a first vertical section and a second inclined section. The first vertical section begins in an opening of the upper side 35 of the drum base 15 and opens into the second oblique section. The second inclined section in turn opens in the drum valve 40.

In addition, it is shown in FIG. 3 that the first outflow channel 41 and the second outflow channel 42 are inclined relative to one another, i. not perpendicular to each other, run.

LIST OF REFERENCE NUMBERS

10 separator drum

11 centric inlet

12 centrifugal space

13 separation space

14 solid space

15 drum base

16 drum lid 17 lock ring

18 (solid) outlet

20 piston valve

21 Bottom piston spool

22 section spool valve

23 section spool valve

24 vertical section

30 closing chamber

31 first closing chamber section

32 second closing chamber section

33 outer section

34 horizontal endface

35 top drum base

36 Section drum base

37 Section drum base

38 vertical section

39 slit-shaped section

40 drum valve

41 first outflow channel

42 second outflow channel

43 Opening second outflow channel

44 nozzle

45 opening fluid channel

DI virtual diameter

D2 inner diameter second outflow channel

D3 inner diameter first outflow channel

D4 outflow diameter first closing chamber section a angle second closing chamber section

Claims

claims

Separator drum (10) with a hydraulically operated, axially

movable piston slide (20), which can seal a solids space (14) against at least one solids outlet (18), wherein the piston valve (20) via a closing liquid, in particular closing water, fillable closing chamber (30) is stable in its closed position, wherein the closing chamber (30) between a bottom (21) of the spool (20) and a top (35) of a

Drum base (15) is formed,

dad u rch g eken nzeich net that

the closing chamber (30) has a first closing chamber section (31) close to the rotation axis (R) and a second closing chamber section (32) remote from the rotation axis (R),

wherein the first closing chamber section (31) is formed by two mutually parallel sections (22, 36) of the underside (21) of the piston slide (20) and the upper side (35) of the drum base (15),

and

the second closing chamber section (32) has a conical cross section at least in sections.

2. Separator drum (10) according to claim 1,

dad u rch g eken nzeich net that

the second closing chamber section (32) is formed by two sections (23, 37) of the underside (21) of the piston slide (20) which are at an angle to one another and the upper side (35) of the drum lower part (15).

3. Separator drum (10) according to claim 2,

dad u rch gke nze i net that

the two angularly arranged sections (23, 37) of the lower side (21) of the piston slide (20) and the upper side (35) of the lower drum part (15) have an angle (a) of 10 ° -45 °, in particular 15 ° -40 ° °, in particular from 17 ° to 35 °, in particular from 18 ° to 30 °, in particular from 19 ° to 25 °, in particular from 20 °.

4. separator drum (10) according to one of the preceding claims, dad u rch g eken nzeich net that

the ratio of the closing fluid volume in the first

Closing chamber portion (31) to the closing fluid volume in the second closing chamber portion (32) 1: 5 to 1:15, in particular 1:10, is.

5. separator drum (10) according to one of the preceding claims, dad u rch g eken nzeich net that

in the first closing chamber portion (31) has a virtual diameter (Dl) at which a balance between the opening force by the

Drum filling and the closing force by the in the closing chamber (30) located closing fluid prevails, is formed.

6. Separator drum (10) according to one of the preceding claims, geken nzeich net d u rch

at least one drum valve (40) for discharging closing fluid, wherein between the first closing chamber section (31) and the at least one drum valve (40) a first outflow channel (41) and between the second closing chamber section (32) and the at least one drum valve (40) second outflow channel (42) is formed.

7. Separator drum (10) according to claim 6,

dad u rch g eken nzeich net that

the inner diameter (D3) of the first outflow channel (41) is greater than the inner diameter (D2) of the second outflow channel (42).

8. Separator drum (10) according to claim 6 or 7,

dad u rch g eken nzeich net that

in the second outflow channel (42) has a nozzle (44) is formed.

9. Separator drum (10) according to one of claims 6 to 8,

dad u rch g eken nzeich net that

the second outflow channel (42) has an inner diameter (D2) of 0.5 mm

- 5.0 mm, in particular from 1.0 mm - 2.5 mm, in particular of 1.2 mm

- 2.0 mm, in particular of 1.5 mm.

10. Separator drum (10) according to one of claims 6 to 9,

dad u rch g eken nzeich net that

the first outflow channel (41) has an inner diameter (D3) of 2.0 mm - 20.0 mm.

11. Separator drum (10) according to one of claims 6 to 10,

dad u rch g eken nzeich net that

the ratio of the inner diameter (D3) of the first outflow channel (41) to the inner diameter (D2) of the second outflow channel (42) is 1: 3 to 1:15.

12. Separator drum (10) according to one of claims 5 to 11,

dad u rch g eken nzeich net that

the discharge diameter (D4) of the first closing chamber section (31) is greater than or equal to the virtual diameter (D1).

13. Separator drum (10) according to one of claims 6 to 12,

This means that

an opening (43) of the second outflow channel (42) is formed in the region or in the vicinity of the largest diameter of the closing chamber (30).