EP1808234A1 - Staubabscheidevorrichtung für Staubsammelbehälter - Google Patents

Staubabscheidevorrichtung für Staubsammelbehälter Download PDF

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Publication number
EP1808234A1
EP1808234A1 EP06100366A EP06100366A EP1808234A1 EP 1808234 A1 EP1808234 A1 EP 1808234A1 EP 06100366 A EP06100366 A EP 06100366A EP 06100366 A EP06100366 A EP 06100366A EP 1808234 A1 EP1808234 A1 EP 1808234A1
Authority
EP
European Patent Office
Prior art keywords
preseparator
separation unit
separation
separation units
means according
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
EP06100366A
Other languages
English (en)
French (fr)
Other versions
EP1808234B1 (de
Inventor
Karl Thysell
Johan Sunesson
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.)
HTC Sweden AB
Original Assignee
HTC Sweden AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HTC Sweden AB filed Critical HTC Sweden AB
Priority to AT06100366T priority Critical patent/ATE422392T1/de
Priority to DE602006005133T priority patent/DE602006005133D1/de
Priority to EP06100366A priority patent/EP1808234B1/de
Priority to PCT/EP2007/050296 priority patent/WO2007080185A1/en
Publication of EP1808234A1 publication Critical patent/EP1808234A1/de
Application granted granted Critical
Publication of EP1808234B1 publication Critical patent/EP1808234B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C5/00—Apparatus in which the axial direction of the vortex is reversed
    • B04C5/14—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations
    • B04C5/15—Construction of the underflow ducting; Apex constructions; Discharge arrangements ; discharge through sidewall provided with a few slits or perforations with swinging flaps or revolving sluices; Sluices; Check-valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C11/00—Accessories, e.g. safety or control devices, not otherwise provided for, e.g. regulators, valves in inlet or overflow ducting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/06—Dust extraction equipment on grinding or polishing machines
    • B24B55/10—Dust extraction equipment on grinding or polishing machines specially designed for portable grinding machines, e.g. hand-guided
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/10—Single-purpose machines or devices
    • B24B7/18—Single-purpose machines or devices for grinding floorings, walls, ceilings or the like

Definitions

  • the present invention relates to a preseparator means for a dust collector and more particularly preseparator means having two separation units operating intermittently to enable continuous operation of the preseparator means.
  • Dust collectors are previously known devices employed to separate dust particles from a gas flow. For example they may be used when grinding and polishing floors, as described in EP 1 580 801 .
  • a dust collector incorporates or is connected to a preseparator collecting a greater part of the particles and a filter unit collecting the remainder of the particles when functioning properly.
  • Filters are disposable units and need maintenance, such as cleaning, for prolonged life. However, the filter maintenance should be kept at a minimum since it is time consuming, and changing filters involves a cost.
  • the preseparator is often a cyclone, which only needs emptying from time to time. When the cyclone unit begins to fill up, the efficiency decreases. When the cyclone is contains a small amount of dust, it can typically remove 95 % of the particles, but it is usually not emptied until efficiency has decreased to 70 %. This is because the gas flow has to be shut off in order to empty the cyclone resulting in an undesired down period.
  • a preseparator means capable of continuous operation, such that the dust collection and the associated grinding or polishing operation need not be interrupted. Also, a preseparator capable of 95 % efficiency would mean savings relative to filter maintenance and exchange.
  • the invention provides a preseparator means for a dust collector, comprising: at least two dust separation units, each adapted to receive a gas flow carrying dust particles at an inlet, separating and collecting at least a part of the dust particles from the gas, and emitting the gas thus treated at an outlet;
  • the switching means comprises a rotary valve assembly connecting a main inlet of the preseparator means to inlets of respective separation units, and connecting outlets of respective separation units to a main outlet of the preseparator means.
  • Each separation unit may comprise a cyclone.
  • the preseparator means of the present invention is intended to be connected to a further dust collection unit, typically a filter unit.
  • a further dust collection unit typically a filter unit.
  • the invention has been developed in connection with grinding floors and similar operations, but the invention is also applicable in other contexts.
  • the invention is not restricted to any particular form of dust, neither with respect to material nor particles size.
  • Fig. 1 shows one embodiment of a preseparator means according to the invention.
  • it comprises separation units 2A and 2B with respective inlets 3A (on the rear side) and 3B, respectively, and outlets 4A and 4B, respectively.
  • a main inlet 5 is connected to a gas intake, typically a casing of a finishing machine having a tool producing dust released into the gas (air).
  • a main outlet 6 of the preseparation devices connected through an interposed filter unit to a suction source, typically an industrial vacuum cleaner.
  • a cycle of the operation of the preseparator means involves operation of one separation unit 2A, while the other separation unit 2B is shut off and emptied, and vice versa, and preferably also a period when both separation units 2A and 2B are operating.
  • Fig. 2 shows the underside of the separation units 2A and 2B.
  • Each separation unit comprises a shutter 7A, 7B, adapted to close an opening at the bottom of the separation unit where dust will settle by force of gravity.
  • the shutter When gas is flowing through a separation unit, the shutter is sucked upwards closing the opening in the bottom.
  • the gas flow through a separation unit is shut off, the shutter is pulled down by gravity, allowing the collected dust to fall out.
  • a wide tube, or sack is connected at the lower end of the cycle for removing the dust.
  • each separation unit comprises a cyclone.
  • the cyclone comprises an outer cylinder wall with an inlet at the top, such as inlet 3B, where gas carrying dust particles enters.
  • Inside the cyclone is an inner cylinder, extending down from the top of the cyclone approximately one third of its height.
  • the gas flow enters the inlet in a peripheral direction and spirals down between the outer cylinder and inner cylinder. Dust particles collide with the wall reducing their speed, and fall down to settle on the bottom of the cyclone.
  • the gas turns at the bottom and rises upwards through the inner cylinder and through an outlet at the top, such as outlet 4B.
  • An example of a cyclone may also be seen from US Patent No. 6,195,835 .
  • the operation cycle is controlled by switching means 8.
  • the switching means comprises a rotary valve assembly, comprising stationary plates 9 with holes 10A, 10B, 10C, 10D, connected to the main inlet 5, the inlets and outlets 4A, 4B of the separation units 2A, 2B and the main outlet 6.
  • the connections are made by means of tubes and manifolds which are not shown.
  • a rotary valve control plate 11 is interposed between the stationary plates 9 to open and close the holes 10A, 10B, 10C, 10D, in a predetermined cycle.
  • the main inlet 5 is connected to the lower holes 10C and 10D by means of a manifold, part of which is seen in fig. 2, to the left side of the valve assembly 8.
  • the main outlet 6 is similarly connected to the top holes 10A and 10B at the right side by means of another manifold.
  • the inlet 3A of the separation unit 2A is connected to the right side of the hole 10C, while the outlet 4A of the separation unit 2A is connected to the left side of the hole 10B.
  • the inlet 3B of the separation unit 2B is connected to the right side of the hole 10D, while the outlet 4B of the separation unit 2B is connected to the left side of the hole 10A.
  • Fig. 3 shows the valve assembly 8 with the rotary plate 11 (Fig. 6) in a middle position.
  • the position of the rotary plate is controlled by a motor 13 connected by means of a rod 15 to crank 14 in turn connected to the rotary plate.
  • the motor is rotating, the rotary valve plate 11 is reciprocating between the end positions of figs. 4 and 5, while fig. 3 shows the middle position.
  • FIG. 6 An embodiment of the rotary valve plate 11 is shown in fig. 6. It is provided with four holes 12A, 12B, 12C, 12D, which are elongated in the peripheral direction. There are two vent holes 19A and 19B. A center hole 17 is connected by means of a shaft to the crank 14.
  • the rotary plate has been rotated counterclockwise to a first end position.
  • the hole 12A coincides with the hole 10C
  • the hole 12D coincides with the hole 10B
  • solid areas of the rotary plate block the holes 10A and 10D.
  • all the gas flow is drawn through the separation unit 2A, while the separation unit 2B is shut off.
  • the shutter 7B is opened and collected dust is emptied from the unit 2B.
  • the vent hole 19B is connected by means of a separate tube (not shown) to the separation unit 2B admitting air under atmospheric pressure to the unit. The vent hole facilitates the opening of the shutter and emptying of dust.
  • both separation units are in operation one half of the cycle, while only one or the other of the separation units 2A and 2B are shut off during the other half of the cycle.
  • the time of the shut off period is not very critical and is dependent on the type of dust and particle size etc.
  • a separation unit should never be allowed to be too full, as the separation efficiency will decrease when the separation unit starts to fill up.
  • frequent release of dust is no disadvantage.
  • the shut off period is greater than 20 seconds, preferably in the range of 30 - 90 seconds.
  • a whole cycle is two minutes, i.e. 30 seconds with both units operating, 30 seconds with separation unit A operating, 30 seconds with both units operating and finally 30 seconds with separation unit B operating.
  • the relative time period of overlap, when both units are operating, relative to the time period when only one unit is operating is dependent on the peripheral extension of the elongated holes 12A through 12D. Also, this extension controls the time period when there is full flow through the respective separation units.
  • the switching between the separation units may be performed by other alternative means, such as sliding shutters or individual valves. With individual valves, the switching of operation between the separation units may be dependent of the amount of dust collected in each unit.
  • the described embodiment comprises two separation units, while it is possible to add even further separation units working in unison to allow at least one separation unit to be shut off intermittently. Also, the separation units need not be the type of cyclone specifically described here.
  • the invention enables continuous operation as the individual separation units are emptied alternatively. Thus, the down period of the prior art has been eliminated. Since dust is not allowed to accumulate, each separation unit will also retain its high efficiency during operation. As mentioned in the introduction, as much as 95 % of the dust may be collected in the preseparator means relieving the subsequent filter units. This results in less filter maintenance and exchange costs.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)
EP06100366A 2006-01-16 2006-01-16 Staubabscheidevorrichtung für Staubsammelbehälter Active EP1808234B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT06100366T ATE422392T1 (de) 2006-01-16 2006-01-16 Staubabscheidevorrichtung für staubsammelbehälter
DE602006005133T DE602006005133D1 (de) 2006-01-16 2006-01-16 Staubabscheidevorrichtung für Staubsammelbehälter
EP06100366A EP1808234B1 (de) 2006-01-16 2006-01-16 Staubabscheidevorrichtung für Staubsammelbehälter
PCT/EP2007/050296 WO2007080185A1 (en) 2006-01-16 2007-01-12 Separator means for dust collector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06100366A EP1808234B1 (de) 2006-01-16 2006-01-16 Staubabscheidevorrichtung für Staubsammelbehälter

Publications (2)

Publication Number Publication Date
EP1808234A1 true EP1808234A1 (de) 2007-07-18
EP1808234B1 EP1808234B1 (de) 2009-02-11

Family

ID=36513962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06100366A Active EP1808234B1 (de) 2006-01-16 2006-01-16 Staubabscheidevorrichtung für Staubsammelbehälter

Country Status (3)

Country Link
EP (1) EP1808234B1 (de)
AT (1) ATE422392T1 (de)
DE (1) DE602006005133D1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009041888A1 (en) * 2007-09-28 2009-04-02 Htc Sweden Ab Method and device for creating a stream of air for removing residue particles formed in connection with cutting, grinding and/or polishing of a stone or stone-like material

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3539483A1 (de) * 1985-11-07 1987-05-21 Steinmueller Gmbh L & C Verfahren und anlage zur beschickung von hydrozyklonen mit einer feststoff beladenen fluessigkeit
JPH0549973A (ja) * 1991-08-22 1993-03-02 Mitsubishi Heavy Ind Ltd 機械式集塵装置
US20040237484A1 (en) 2002-11-08 2004-12-02 Bernd Altvater Device for separating liquid from a gas current
WO2004105955A1 (de) * 2003-06-02 2004-12-09 Mann+Hummel Gmbh Einrichtung zum schalten von zyklonen
EP1580801A1 (de) 2004-03-26 2005-09-28 HTC Sweden AB Verfahren und Vorrichtung zum Schleifen von Bodenflächen aus Beton
EP1614871A2 (de) * 2004-07-06 2006-01-11 Hengst GmbH & Co. KG Einrichtung für die Regelung des Drucks im Kurbelgehäuse einer Brennkraftmaschine und für die Ölnebelabscheidung aus dem Kurbelgehäuseentlüftungsgas

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3539483A1 (de) * 1985-11-07 1987-05-21 Steinmueller Gmbh L & C Verfahren und anlage zur beschickung von hydrozyklonen mit einer feststoff beladenen fluessigkeit
JPH0549973A (ja) * 1991-08-22 1993-03-02 Mitsubishi Heavy Ind Ltd 機械式集塵装置
US20040237484A1 (en) 2002-11-08 2004-12-02 Bernd Altvater Device for separating liquid from a gas current
WO2004105955A1 (de) * 2003-06-02 2004-12-09 Mann+Hummel Gmbh Einrichtung zum schalten von zyklonen
EP1580801A1 (de) 2004-03-26 2005-09-28 HTC Sweden AB Verfahren und Vorrichtung zum Schleifen von Bodenflächen aus Beton
EP1614871A2 (de) * 2004-07-06 2006-01-11 Hengst GmbH & Co. KG Einrichtung für die Regelung des Drucks im Kurbelgehäuse einer Brennkraftmaschine und für die Ölnebelabscheidung aus dem Kurbelgehäuseentlüftungsgas

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 355 (C - 1079) 6 July 1993 (1993-07-06) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009041888A1 (en) * 2007-09-28 2009-04-02 Htc Sweden Ab Method and device for creating a stream of air for removing residue particles formed in connection with cutting, grinding and/or polishing of a stone or stone-like material

Also Published As

Publication number Publication date
EP1808234B1 (de) 2009-02-11
ATE422392T1 (de) 2009-02-15
DE602006005133D1 (de) 2009-03-26

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