EP0706829A1 - Tambour centrifuge - Google Patents

Tambour centrifuge Download PDF

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Publication number
EP0706829A1
EP0706829A1 EP95115891A EP95115891A EP0706829A1 EP 0706829 A1 EP0706829 A1 EP 0706829A1 EP 95115891 A EP95115891 A EP 95115891A EP 95115891 A EP95115891 A EP 95115891A EP 0706829 A1 EP0706829 A1 EP 0706829A1
Authority
EP
European Patent Office
Prior art keywords
chamber
closing
piston valve
outlet
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95115891A
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German (de)
English (en)
Other versions
EP0706829B1 (fr
Inventor
Siegfried Dr.-Ing König
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Flottweg GmbH
Original Assignee
Flottweg GmbH
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Publication date
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Application filed by Flottweg GmbH filed Critical Flottweg GmbH
Publication of EP0706829A1 publication Critical patent/EP0706829A1/fr
Application granted granted Critical
Publication of EP0706829B1 publication Critical patent/EP0706829B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/10—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl
    • B04B1/14—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge

Definitions

  • the invention relates to a centrifugal drum of a self-emptying centrifuge with a hydraulically operated, axially movable piston valve which seals a solid space against at least one solids outlet, the piston valve being held in its closed position by a closing chamber which can be filled with a closing medium, preferably closing water, a preferably hydraulically movable piston valve , which is arranged in an outlet chamber and seals the closing chamber against an outlet, the piston valve being supported on a force accumulator arranged in the outlet chamber, preferably one or more compression springs, and having a passage opening through which the closing chamber and outlet chamber can be connected, and a control line, via which control fluid can be supplied to the effective surface of the piston valve opposite the energy accumulator.
  • a closing medium preferably closing water
  • a preferably hydraulically movable piston valve which is arranged in an outlet chamber and seals the closing chamber against an outlet
  • the piston valve being supported on a force accumulator arranged in the outlet chamber, preferably one or more compression spring
  • DE-PS 19 09 996 discloses a centrifugal drum of a clarifier with a rotor body, in which a separation space and a set of plate inserts are arranged.
  • the wall of the rotor body has outlet openings which are closed by a piston valve, the movement of the piston valve being carried out with a control liquid, for example water.
  • the control liquid is supplied to a space on the underside of the piston valve via a fixed line.
  • the room has an outlet opening, which can be closed by means of a ring valve supported on springs is.
  • This ring valve is arranged in a chamber and can be supplied with control liquid via a second control line in such a way that the ring valve opens the outlet opening of the space arranged below the piston valve.
  • both partial and complete emptying of the separation space can be carried out via the outlet openings in the rotor wall.
  • the ring valve is acted upon with control liquid in such a way that it is pressed into the chamber arranged below the ring valve against the force of the springs, as a result of which the control liquid flows out below the piston valve due to the pressure of the centrifugal chamber which presses on the piston valve.
  • the control fluid passes through a bore arranged in the ring valve into the space arranged below the ring valve, from where it can escape via an outlet. This outlet is designed as a throttle. If the control liquid striking above the ring valve is discharged via outlets, the spring pressure exceeds the liquid pressure, so that the ring valve is returned to its starting position and seals the control chamber arranged below the piston valve.
  • this known centrifugal drum has a further control line which is connected to the space arranged below the ring valve.
  • this space is previously partially filled with control fluid via the control line, so that when control fluid flows in further through the bore arranged in the ring valve, the pressure in this space rises and the ring valve presses back into the starting position after a short opening time.
  • centrifugal drums which use control systems with chambers which absorb the entire closing water liquid when fully emptied and are pre-filled when partially emptied. These chambers are opened via throttled outlets, so that the operation of such centrifugal drums requires precisely metered control water supplies, which is often complicated in practice and requires complex control water treatment.
  • it is structurally complex to master the corresponding paths and closing speeds of the spool in such centrifugal drums, so that, among other things, complex control valves must be used, which create an additional opening of the chamber to the outside to minimize the inertia of these designs.
  • control valves are, however, very limited, since only limited throttling of the control fluids is possible due to the limited bore cross sections.
  • several control valves can be provided on the circumference of such a centrifugal drum, which should also prevent the valve spool from tilting.
  • Such a centrifugal drum is known for example from DE-PS 32 40 093, which is provided with a valve piston which is constantly pressed into its closed position via a pressure medium, namely a closing liquid, in the case of the frequently occurring partial emptying.
  • a pressure medium namely a closing liquid
  • the invention has for its object to design a centrifugal drum of the type mentioned in such a way that partial emptying with accelerated closing and a large stroke height of the spool are possible and, optionally, full emptying of the drum, which can be controlled from the outside, without the negative influence of a collecting chamber on the outflow of the closing liquid and, in particular, without being able to pre-fill it during partial emptying.
  • a centrifugal drum according to the invention that the outlet chamber is sealed by means of a preferably hydraulically controllable control slide against at least one outlet opening into which the flowing medium flowing into the outlet chamber flows freely when the solids space is completely emptied, the control slide mechanically over at least an energy store is held in its closed position.
  • This embodiment has the particular advantage that the outlet chamber is closed by a hydraulically controllable control slide, the opening of which requires a fluid pressure, the closing of which, however, takes place mechanically via a force accumulator, preferably a plurality of compression springs, after the fluid pressure has been reduced.
  • a force accumulator preferably a plurality of compression springs
  • the controllable control slide is actuated by means of a control liquid during the above-mentioned process without closing medium supply in such a way that it opens the outlet opening through which the closing medium arranged in the outlet chamber can flow off.
  • the drum now remains open until the control liquid supply via the piston valve is stopped and the closing chamber is then filled with closing liquid again. If the pressure in the control line disengaging the spool is reduced, the energy accumulator presses, namely the Pressure springs return the control slide to its initial position, so that the outlet opening of the outlet chamber is sealed and the increasing fluid pressure in the outlet chamber pushes the piston valve sealingly against the outlet. The closing water remaining in the outlet chamber can then flow out through a throttled outlet.
  • control slide is essentially U-shaped in cross section and forms part of the housing with its legs.
  • control slide has an essentially pot-shaped configuration and, with its legs, engages around the region of the housing in which the outlet chamber is arranged.
  • control slide and the piston valve can be controlled by means of a coordinated calibration of supply channels for the opening of the control slide on the one hand and the movement of the piston valve on the other hand, in connection with the dimensioning of the radius R via a common control water supply line.
  • the radius R is the dimension of the supply chamber for the control liquid.
  • This feed chamber can be designed in the form of an overflow weir that separates the two feed channels to the control slide on the one hand and to the piston valve on the other.
  • control slide and the piston valve can be controlled via separate control water supply lines.
  • corresponding amounts of control water can be set in different sizes to control the piston valve or the control slide.
  • FIG. 1 shows a schematic representation of the main part of a half of a centrifugal drum in axial section.
  • a centrifugal drum shown in the drawing has a central inlet 1 for a solid-liquid mixture to be separated, via which the solid-liquid mixture enters a centrifugal space 2, which is composed of a separating space 4 and a solid space 6.
  • the solids chamber 6 is designed as a double cone and is delimited in its lower region by a piston slide 8, which closes or releases a solid outlet for the solids provided in the drum casing 9 when the piston slide 8 is displaced axially within the centrifugal chamber 2 from the closed position shown in the drawing is.
  • the centrifugal drum is closed in its upper region with a drum cover 3 which is connected to the drum casing 9 by a locking ring 5.
  • a closing chamber can be acted upon with a closing liquid, namely closing water via a fixed control water supply line 30 and a channel 28, in the outer circumferential region of which outlet channels 11 are arranged which connect the closing chamber 10 to an outlet chamber 12.
  • the piston valve 16 is thus mounted in the outlet chamber 12 so as to be displaceable parallel to the piston slide 8 in the axial direction of the centrifugal drum.
  • the springs 21 supporting the piston valve 16 are supported on a ring part 19 which is screwed to the drum casing 9.
  • Sealing bodies 23 are arranged on the piston valve 16 and seal the outlet channels from the closing chamber 10 with respect to the outlet chamber 12.
  • the piston valve 16 is pressed by means of the springs 21 against the inner surface of the drum shell 9, in which the outlet channels 11 are arranged.
  • the centrifugal drum also has a control water supply line 32, which Via channels 24 and 27 control water between the piston valve 16 and the drum jacket 9 promotes, so that a hydraulic pressure is built up in this area, which is greater than the pressure applied by the springs to the underside of the piston valve 16, so that the piston valve 16 through Treatment with control water via the control water supply line 32 and the channels 24 and 27 is moved in the axial direction of the centrifugal drum into the outlet chamber.
  • the control water present in the locking chamber 10, which holds the piston slide 8 in its closed position, can thus suddenly flow in via the outlet channel 11 into the outlet chamber 12 and via passages 22 in the piston valve 16 into a chamber 17 arranged below the piston valve 16.
  • the control water is displaced from the closing chamber 10 by the pressure built up in the separating space 2, which acts on the piston slide 8 and moves it downward. This movement of the piston slide 8 releases the discharge openings 7 so that solids can escape from the centrifugal drum via the discharge opening 7.
  • the chamber 17 arranged below the piston valve 16 has a smaller volume than the closing chamber 10, so that the chamber 17 can only absorb part of the closing water escaping from the closing chamber 10.
  • the closing water flowing under the piston valve 16 thus builds up on the underside of the piston valve 16 a pressure which supports the spring 21 and which returns the piston valve 16 to its closed position.
  • the pressure in the closing chamber 10 increases, so that the closing water likewise transfers the piston slide 8 into its closed position and closes the ejection opening 7.
  • the closing water flowing into the outlet chamber 12 during the partial emptying flows out via throttled outlets 13 after the opening process has ended.
  • the centrifugal drum also has an axially movable control slide 20, which is pressed via springs 25 against a sealing ring 14, for example made of polyamide.
  • the springs 25 are supported in a ring having a U-shaped cross-section which is firmly screwed to the drum jacket 9.
  • the control slide 20 closes the chamber 17 between the piston valve 16 and a ring part 19 which is fixedly connected to the drum casing 9 and on which the springs 21 of the piston valve 16 are supported.
  • control slide 20 is essentially U-shaped in cross section, its legs being part of the outer surface of the centrifugal drum and having throttled outlets 15 and 18 which allow the control liquid to flow out.
  • a channel 26 for supplying control water is arranged between the drum jacket 9 and the control slide 20, the channel 26 being connected to a control water supply line 31.
  • control water remaining between the control slide 20 and the drum jacket 9 flows off via the throttled outlet 18 and the springs 25 move the control slide 20 back into the closed position, so that the control slide 20 also its leg end rests sealingly on the sealing ring 14.
  • the closing chamber 10 is filled with closing water via the fixed closing water feed line 30 and the channel 28 in order to move the piston slide 8 into its closed position.
  • control liquid is supplied to the outlet chamber 12 via the control water supply line 32 and the channels 24 and 27.
  • a hydraulic pressure is generated in the outlet chamber 12, which pushes the piston valve 16 downwards, i.e. moves against the force of the springs 21 and the outlet channels 11 opens.
  • the pressure in the closing chamber 10 drops and the pressure on the piston slide in the centrifugal chamber 2 displaces the piston slide 8, displacing the closing water arranged in the closing chamber in the axial direction such that the ejection openings 7 are released.
  • the closing water emerging from the outlet channel 11 passes through the passages 22 in the piston valve 16 into the chamber 17 arranged under the piston valve 16 , so that on the piston valve 16 a spring force of the spring 21 supporting pressure acts through the closing water flowing into the chamber 17, which causes an accelerated closing of the outlet channel by moving the piston valve 16 into its closed position. Since closing water is constantly supplied to the closing chamber 10 via the channels 29 and 28 from the fixed closing water supply line, the ejection opening 7 is closed again in a fraction of a second by the piston slide 8. As a result, partial discharge of the centrifugal drum can be carried out in this way.
  • control and / or closing water is passed into the channel 26 via the control and / or closing water supply line 31, so that a pressure is built up between the control slide 20 and the ring part 19 screwed to the drum jacket 9, which pressure is overcome the force from the springs 25 moves the control slide 20 in such a way that the annular gap in the region of the sealing ring 14 is opened, so that existing or inflowing closing water in the chamber 17 can flow out via this annular gap. If one now carries out the procedure of the above-mentioned partial emptying, it can be seen that the chamber 17 is ineffective, so that closing water flowing into this chamber does not result in the piston valve being transferred from its open position into its closed position in fractions of a second.
  • the illustrated embodiment of the centrifugal drum according to the invention provides separate control or closing water supply lines 30 and 31 for the control slide 20 and the piston valve 16.
  • the control slide 20 and the piston valve 16 by coordinated calibration of supply channels 24, 26 and 27 for opening the control slide 20 on the one hand and the movement of the piston valve 16 on the other hand in connection with the dimensioning of the radius R over a common Control water supply are controllable.
  • a so-called overflow weir can be arranged in the area of the control water supply lines, which is formed by a separating plate between the two supply channels 26 and 27 and which controls the inflow of the control water into one or the other supply channel.

Landscapes

  • Centrifugal Separators (AREA)
EP95115891A 1994-10-12 1995-10-09 Tambour centrifuge Expired - Lifetime EP0706829B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4436459 1994-10-12
DE4436459A DE4436459C2 (de) 1994-10-12 1994-10-12 Schleudertrommel

Publications (2)

Publication Number Publication Date
EP0706829A1 true EP0706829A1 (fr) 1996-04-17
EP0706829B1 EP0706829B1 (fr) 2001-06-06

Family

ID=6530589

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95115891A Expired - Lifetime EP0706829B1 (fr) 1994-10-12 1995-10-09 Tambour centrifuge

Country Status (2)

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EP (1) EP0706829B1 (fr)
DE (2) DE4436459C2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6827680B2 (en) * 2001-01-19 2004-12-07 Westfalia Separator Ag Centrifuge
WO2010034751A1 (fr) * 2008-09-25 2010-04-01 Gea Westfalia Separator Gmbh Centrifugeuse comportant un panier centrifuge à vidange automatique
US9387491B2 (en) * 2013-03-06 2016-07-12 Alfa Laval Corporate Ab Centrifugal separator having a valve body provided in an outlet channel
CN116507421A (zh) * 2020-11-02 2023-07-28 Gea韦斯伐里亚分离机集团有限公司 分离机

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004051264A1 (de) * 2004-10-21 2006-04-27 Westfalia Separator Ag Separator mit einer Schleudertrommel und einem Kolbenschieber

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1909996A1 (de) 1968-02-29 1970-01-08 Alfa Laval Ab Schlammzentrifuge
US3494546A (en) * 1967-03-29 1970-02-10 Alfa Laval Ab Centrifuge with variable discharge
DE3240093A1 (de) 1982-10-29 1984-05-03 Westfalia Separator Ag, 4740 Oelde Zentrifuge mit einer selbstentleerenden schleudertrommel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3494546A (en) * 1967-03-29 1970-02-10 Alfa Laval Ab Centrifuge with variable discharge
DE1909996A1 (de) 1968-02-29 1970-01-08 Alfa Laval Ab Schlammzentrifuge
DE3240093A1 (de) 1982-10-29 1984-05-03 Westfalia Separator Ag, 4740 Oelde Zentrifuge mit einer selbstentleerenden schleudertrommel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Operating means to control the discharge of the contents of a separating chamber of a centrifugal separator", RESEARCH DISCLOSURE, vol. 171, pages 24 - 25 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6827680B2 (en) * 2001-01-19 2004-12-07 Westfalia Separator Ag Centrifuge
WO2010034751A1 (fr) * 2008-09-25 2010-04-01 Gea Westfalia Separator Gmbh Centrifugeuse comportant un panier centrifuge à vidange automatique
CN102164679A (zh) * 2008-09-25 2011-08-24 Gea机械设备有限公司 具有自排空的离心式转鼓的离心分离机
CN102164679B (zh) * 2008-09-25 2016-03-30 Gea机械设备有限公司 具有自排空的离心式转鼓的离心分离机
US9387491B2 (en) * 2013-03-06 2016-07-12 Alfa Laval Corporate Ab Centrifugal separator having a valve body provided in an outlet channel
CN116507421A (zh) * 2020-11-02 2023-07-28 Gea韦斯伐里亚分离机集团有限公司 分离机

Also Published As

Publication number Publication date
DE4436459C2 (de) 1997-04-24
EP0706829B1 (fr) 2001-06-06
DE4436459A1 (de) 1996-04-18
DE59509317D1 (de) 2001-07-12

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