WO1991015282A1 - Filter - Google Patents

Filter Download PDF

Info

Publication number
WO1991015282A1
WO1991015282A1 PCT/SE1990/000224 SE9000224W WO9115282A1 WO 1991015282 A1 WO1991015282 A1 WO 1991015282A1 SE 9000224 W SE9000224 W SE 9000224W WO 9115282 A1 WO9115282 A1 WO 9115282A1
Authority
WO
WIPO (PCT)
Prior art keywords
helically
filter
channel
casing
shaped channel
Prior art date
Application number
PCT/SE1990/000224
Other languages
French (fr)
Inventor
Bo Ritzler
Kjell Klangeryd
Original Assignee
Filtrator 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 Filtrator Ab filed Critical Filtrator Ab
Publication of WO1991015282A1 publication Critical patent/WO1991015282A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/04—Combinations of filters with settling tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/117—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B01D29/902—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding containing fixed liquid displacement elements or cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B01D29/908—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding provoking a tangential stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/92—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging filtrate
    • B01D29/925—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging filtrate containing liquid displacement elements or cores

Definitions

  • the present invention relates to a disposable filter intended for the separation of heavier particles from a liquid suspension.
  • Swedish Patent Specification No. 8305717-4 teaches a segregating or separating device in the form of a funnel-shaped throughflow device, the outlet orifice or mouth of which is contained by an outwardly directed collar and through which the liquid containing said heavier particles flows with a rotational component. before reaching a collecting vessel positioned beneath the throughflow device.
  • the motive energy is transformed into kinetic energy and the heavier parti- cles fall essentially straight down under the influence of gravity, whereas the lighter particles are guided by the collar for movement in a lateral direction before leaving the throughflow device. In this way, a coarse separation is achieved with the intention that the lighter particles will subsequently settle on the bottom of the collecting vessel.
  • the efficiency of this known device is insufficient to meet present-day demands concerning non-toxic emissions.
  • the present invention achieves in a simple and optimally functional manner practically complete sepa ⁇ ration of heavier particles from a liquid suspension.
  • the reference numeral 1 identifies the lower part of a separation chamber 1 of the kind illus ⁇ trated and described in the aforesaid Swedish Patent Specification No. 8305717-4.
  • the separation chamber 1 is connected to a vacuum source and is provided with an inlet opening for tangential supply of the contaminated liquid to be filtered.
  • the lower part of the separation chamber 1 has a funnel-shape and opens into a conically tapered opening 2 which merges with an orifice defined by an outwardly folded collar 3.
  • the separation chamber 1 with the opening 2 and the collar 3 do not constitute any part of the present invention and reference is made to the aforementioned Swedish Patent Specification in respect of these members.
  • the separation chamber 1 has a rotationally symmetrical shape.
  • the inventive filter comprises a cylindrical casing 4 which is closed at the bottom thereof by means of a base 5, but which has an open top.
  • a tubular part 6 mounted in the casing is a tubular part 6, the length of which is equal to the length of the casing and which is provided with heli ⁇ cally shaped fins or beads along part of its length.
  • the tubular part 6 connects with the base 5 of the casing 4 via a filter device 8.
  • the outermost peripheral parts of the fins 7 adjoin the inner surface of the casing wall.
  • a cylindrical channel 9 Mounted within the tubular part 6 and also within the axial extension of the fins 7 is a cylindrical channel 9, the envelope surface of which adjoins or is contiguous on the inner peripheral edges of the fins 7.
  • the length of the cylindrical channel is such that its upper end commences at a point beneath the uppermost fin and terminates at a point above the lowermost fin.
  • the filter is dimensioned in such a way that the collar 3 of the separation chamber 1 will be located immediately above the upper end of the channel 9.
  • the casing 4 is also provided at the top thereof will a spillway 10 which has the form of a tube-orifice and which is con- nected to a suction pump P by means of a pipe or like conduit.
  • the top of the casing 4 is detachably connected by means, e.g. of a bayonet fitting, indicated at 11, in a recess provided in the lower part of the separation chamber 1.
  • the motive energy will decrease and therewith cause the particles, as the liquid flows downwards in the helical-shaped channel 13, to deposit to a large extent on the walls of said channel.
  • the liquid then flows through the filter device 8 and rises outwards through the helically-shaped channel 14 formed between the exterior surfaces of the fins 7 and the inside surface of the casing 4.
  • the filter When considered necessary or appropriate, depending on the type of liquid and particles involved, the filter can be removed by releasing the bayonet fitting 11, after which the filter can be deposited in a suitable manner for the eventual recovery of the particles col ⁇ lected in said filter.
  • the filter has been referred to as a disposable filter, it will be under ⁇ stood that it lies within the scope of the present invention to clean the filter for re-use, when necessary.
  • Sedementation and collection of the particles suspended in the liquid is, in accordance with the invention, extremely effective due to the fact that light particles are separated from the heavier particles and that sede ⁇ mentation can take place under extremely gentle condi- tions and on relatively large surfaces.
  • the casing 4, the channel 9 and the tube-part 6 can be made slightly conical in order to simplify manufacture and assembly.
  • the various parts can be mounted in a manner such that the casing 4 and the channel 9 connect sealingly with the respective outer and inner edge surfaces of the fins.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Centrifugal Separators (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
  • Filtering Materials (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

A disposable filter for the separation of heavier particles from a liquid suspension. The filter is distinguished by a vertical helically-shaped channel (13) which encloses a central cylindrical channel (9) and which is surrounded by a casing (4) which has a base (5) and which adjoins the outer periphery of the helically-shaped channel. The lower end of the cylindrical channel is connected with the base by means of a filter device (8). The filter is detachably connected by means of a fastening device (11) to the lower part of a separator (1), which functions to separate the suspension into a coarse fraction and a fine fraction, the latter fraction being led into the top of the helically-shaped channel (13) and the coarse fraction being led into the cylindrical channel (9), whereas the cleansed liquid is discharged at the top of the casing (4).

Description

FILTER
The present invention relates to a disposable filter intended for the separation of heavier particles from a liquid suspension.
Nowadays, great demands are placed on the prevention of the emission of environmentally harmful substances. In industry and in public health and dental care facili- ties, for example, cooling, flushing and rinsing liquids are used which are ultimately discharged into lakes and rivers via the sewage systems. These liquids very often contain substances which represent a threat to both plants and wildlife, for instance metal substances, such as lead, aluminium and mercury. Metals present in car¬ rier liquids, such as water, must of necessity be sepa¬ rated from the liquid before it reaches the environment, while at the same time it is desirable to reclaim such particles in those cases where they constitute a valu- able content. Many different proposals and solutions exist for the purpose of separating heavy particles from liquid/particle suspension in some way or another. Examples of such methods range from pure sedimentation to centrifugation. The separation plants involved, however, are slow and/or expensive and yet still fail to provide acceptable cleansing of the carrier liquid, e.g. cleansing to almost 100%. Furthermore, it is necessary to clean such plants at regular intervals and conse¬ quently each plant itself represents a problem.
Swedish Patent Specification No. 8305717-4 teaches a segregating or separating device in the form of a funnel-shaped throughflow device, the outlet orifice or mouth of which is contained by an outwardly directed collar and through which the liquid containing said heavier particles flows with a rotational component. before reaching a collecting vessel positioned beneath the throughflow device. When the suspension leaves the funnel-shaped throughflow device, the motive energy is transformed into kinetic energy and the heavier parti- cles fall essentially straight down under the influence of gravity, whereas the lighter particles are guided by the collar for movement in a lateral direction before leaving the throughflow device. In this way, a coarse separation is achieved with the intention that the lighter particles will subsequently settle on the bottom of the collecting vessel. The efficiency of this known device, however, is insufficient to meet present-day demands concerning non-toxic emissions.
The present invention, as defined in the characterizing clauses of respective Claims, achieves in a simple and optimally functional manner practically complete sepa¬ ration of heavier particles from a liquid suspension.
A more detailed description of the invention will now be made with reference to an exemplifying embodiment there¬ of and also with reference to the accompanying drawing, which illustrates the invention schematically and in section from one side.
In Figure 1, the reference numeral 1 identifies the lower part of a separation chamber 1 of the kind illus¬ trated and described in the aforesaid Swedish Patent Specification No. 8305717-4. The separation chamber 1 is connected to a vacuum source and is provided with an inlet opening for tangential supply of the contaminated liquid to be filtered. The lower part of the separation chamber 1 has a funnel-shape and opens into a conically tapered opening 2 which merges with an orifice defined by an outwardly folded collar 3. The separation chamber 1 with the opening 2 and the collar 3 do not constitute any part of the present invention and reference is made to the aforementioned Swedish Patent Specification in respect of these members.
The separation chamber 1 has a rotationally symmetrical shape.
The inventive filter comprises a cylindrical casing 4 which is closed at the bottom thereof by means of a base 5, but which has an open top. Mounted in the casing is a tubular part 6, the length of which is equal to the length of the casing and which is provided with heli¬ cally shaped fins or beads along part of its length. At the bottom, the tubular part 6 connects with the base 5 of the casing 4 via a filter device 8. The outermost peripheral parts of the fins 7 adjoin the inner surface of the casing wall. Mounted within the tubular part 6 and also within the axial extension of the fins 7 is a cylindrical channel 9, the envelope surface of which adjoins or is contiguous on the inner peripheral edges of the fins 7. As will be seen from the drawing, the length of the cylindrical channel is such that its upper end commences at a point beneath the uppermost fin and terminates at a point above the lowermost fin. The filter is dimensioned in such a way that the collar 3 of the separation chamber 1 will be located immediately above the upper end of the channel 9. The casing 4 is also provided at the top thereof will a spillway 10 which has the form of a tube-orifice and which is con- nected to a suction pump P by means of a pipe or like conduit. The top of the casing 4 is detachably connected by means, e.g. of a bayonet fitting, indicated at 11, in a recess provided in the lower part of the separation chamber 1. The upper edges of the casing 4 and tube-part 6 are sealed against the separation chamber 1 by means of seals 12. Because the particle/liquid suspension supplied to the filter device is guided in a helically-shaped path along the walls of the separation chamber 1, the liquid/ particle suspension will be imparted rotational kinetic energy and will follow the walls of the conically- tapered opening 2 and out along the outwardly-folded collar 3. The liquid, together with light particles, will therewith be spread in a fan-like manner around the entire periphery of the collar and will leave said collar in a more or less horizontal direction. In this way, light particles will be moved in a lateral direc¬ tion and will land in the helically-shaped channel 13 formed by the fins 7 on the tube-section 6 and the cylindrical channel 9. As a result of stagnation of liquid flow, heavy particles which leave through the opening 2 will fall straight down through the channel 9 and collect at the base 5 of the casing 4 inwardly of the filter device 8.
When the liquid carrying the small particles leaves the collar 3, the motive energy will decrease and therewith cause the particles, as the liquid flows downwards in the helical-shaped channel 13, to deposit to a large extent on the walls of said channel. The liquid then flows through the filter device 8 and rises outwards through the helically-shaped channel 14 formed between the exterior surfaces of the fins 7 and the inside surface of the casing 4.
As the liquid now moves calmly upwards, the remaining particles will settle on the exterior surfaces of the fins 7 and consequently the liquid will be totally free from heavier particles when it leaves the spillway 10.
When considered necessary or appropriate, depending on the type of liquid and particles involved, the filter can be removed by releasing the bayonet fitting 11, after which the filter can be deposited in a suitable manner for the eventual recovery of the particles col¬ lected in said filter. Although the filter has been referred to as a disposable filter, it will be under¬ stood that it lies within the scope of the present invention to clean the filter for re-use, when necessary.
Sedementation and collection of the particles suspended in the liquid is, in accordance with the invention, extremely effective due to the fact that light particles are separated from the heavier particles and that sede¬ mentation can take place under extremely gentle condi- tions and on relatively large surfaces.
Although not explicitly stated, it will be understood that it lies within the scope of the invention to pro¬ vide the spillway 10 with a quick coupling for connec- tion to the outlet pipe so as to facilitate filter changes. Neither is a suction pump P essential to the functioning of the filter device. Furthermore, the casing 4, the channel 9 and the tube-part 6 can be made slightly conical in order to simplify manufacture and assembly. Although not essential, the various parts can be mounted in a manner such that the casing 4 and the channel 9 connect sealingly with the respective outer and inner edge surfaces of the fins.

Claims

Claims
1. A disposable filter for the separation of heavier particles from a liquid suspension, c h a r a c - t e r i z e d by a vertical helically-shaped channel (13) which encloses a central cylindrical channel (9) and which is surrounded by a casing (4) having a base (5), said casing connecting with the outer periphery of the helically-shaped channel and the lower end of the cylindrical channel being connected to the base by means of a filter device (8); and further characterized in that the filter is detachably connected by means of a fastening device (11) to the lower part of a separator (1) operative to separate the suspension into a coarse fraction and a fine fraction, the latter fraction being lead into the top of the helically-shaped channel (13) and the coarse fraction being lead into the cylindrical channel (9), and said cleansed liquid being discharged from the top of the casing (4).
2. A filter according to Claim 1, c h a r a c ¬ t e r i z e d by a tubular-part (6) which is corrugated or likewise undulated along part of its length such as to form helically-shaped, continuous fins (9); and further characterized in that a length of tube (9) is mounted inside the tubular-part (6) within the region of the fins (7), such as to form the helically-shaped channel (13).
3. A filter according to Claim 1 or 2, c h a r a c ¬ t e r i z e d a conically tapering opening. (2) con¬ tained by an outwardly folded collar (3) is located co- axially with the cylindrical channel (9), with said collar (3) on a level with the uppermost part of the helically-shaped channel (13).
PCT/SE1990/000224 1988-10-04 1990-04-04 Filter WO1991015282A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8803515A SE462201B (en) 1988-10-04 1988-10-04 FILTER FOR SINGLE USE

Publications (1)

Publication Number Publication Date
WO1991015282A1 true WO1991015282A1 (en) 1991-10-17

Family

ID=20373520

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000224 WO1991015282A1 (en) 1988-10-04 1990-04-04 Filter

Country Status (2)

Country Link
SE (1) SE462201B (en)
WO (1) WO1991015282A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT513063A3 (en) * 2012-06-23 2014-03-15 DüRR DENTAL AG Separator cartridge for a medical suction system
AT517647A3 (en) * 2015-08-28 2017-05-15 Pregenzer Lukas Dental separator with removable sedimentation tank

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE462201B (en) * 1988-10-04 1990-05-21 Filtrator Ab FILTER FOR SINGLE USE
US5055116A (en) * 1989-05-22 1991-10-08 Hoechst Celanese Corp. Gas separation membranes comprising miscible blends of polyimide polymers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3754658A (en) * 1970-10-19 1973-08-28 H Messing Pulp thickener having two vertical perforated screens with nonmoving spirally wrapped blades therebetween
SE439436B (en) * 1983-04-08 1985-06-17 Filtrator Ab Separator with single use receptacle for separation of suspended particles from a fluid
SE462201B (en) * 1988-10-04 1990-05-21 Filtrator Ab FILTER FOR SINGLE USE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3754658A (en) * 1970-10-19 1973-08-28 H Messing Pulp thickener having two vertical perforated screens with nonmoving spirally wrapped blades therebetween
SE439436B (en) * 1983-04-08 1985-06-17 Filtrator Ab Separator with single use receptacle for separation of suspended particles from a fluid
SE462201B (en) * 1988-10-04 1990-05-21 Filtrator Ab FILTER FOR SINGLE USE

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT513063A3 (en) * 2012-06-23 2014-03-15 DüRR DENTAL AG Separator cartridge for a medical suction system
AT517647A3 (en) * 2015-08-28 2017-05-15 Pregenzer Lukas Dental separator with removable sedimentation tank
AT517647B1 (en) * 2015-08-28 2018-08-15 Pregenzer Lukas Dental separator with removable sedimentation tank

Also Published As

Publication number Publication date
SE8803515D0 (en) 1988-10-04
SE8803515L (en) 1990-04-05
SE462201B (en) 1990-05-21

Similar Documents

Publication Publication Date Title
US3529724A (en) Hydrocyclone filter
US5017135A (en) Trap and separator for denial vacuum systems
US4447322A (en) Apparatus for the cyclone separation of liquids having different densities
JP4359975B2 (en) Solid separation device
CN1148349A (en) Filtration device for removing leukocytes
CA2815648C (en) Cyclonic debris filter
GB2036606A (en) Vortex separators
US5866018A (en) Vortex aquarium filter
WO1991015282A1 (en) Filter
JPS5990606A (en) Separation apparatus
JPH09509360A (en) Separation of suspension into individual components
JP4724894B2 (en) Solid separation device
WO1981001526A1 (en) Apparatus for separating excrement and feed remains in a pisciculture cistern
WO2003012217A1 (en) Centripetal separator
CN117042886A (en) Compact disc stacking cyclone separator
US6276936B1 (en) Dental separator for solids from a solids/liquid mixture
CN220969514U (en) Cyclone separator
JPH0725231Y2 (en) Mist separator
JPH06319921A (en) Solid-liquid separator
JP5732630B2 (en) Solid-liquid separator using liquid cyclone
CN208327569U (en) A kind of new type sewage purifier
JPS6327064B2 (en)
CA1181700A (en) Two-stage liquid separator
JP2010274251A (en) Coolant tank with filtering and oil-water separating function
GB2317351A (en) A tangential flow separator with inner settlement chamber

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IT LU NL SE

WR Later publication of a revised version of an international search report
NENP Non-entry into the national phase

Ref country code: CA