GB2106003A - Flow powered rotary screen - Google Patents

Flow powered rotary screen Download PDF

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Publication number
GB2106003A
GB2106003A GB08226595A GB8226595A GB2106003A GB 2106003 A GB2106003 A GB 2106003A GB 08226595 A GB08226595 A GB 08226595A GB 8226595 A GB8226595 A GB 8226595A GB 2106003 A GB2106003 A GB 2106003A
Authority
GB
United Kingdom
Prior art keywords
screen
doctor blade
water
rotate
chambers
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
GB08226595A
Other versions
GB2106003B (en
Inventor
William Henry Taylor Griffin
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB08226595A priority Critical patent/GB2106003B/en
Publication of GB2106003A publication Critical patent/GB2106003A/en
Application granted granted Critical
Publication of GB2106003B publication Critical patent/GB2106003B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
    • B01D33/09—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration with surface cells independently connected to pressure distributors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/44—Regenerating the filter material in the filter
    • B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
    • B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/80—Accessories
    • B01D33/804—Accessories integrally combined with devices for controlling the filtration
    • B01D33/807—Accessories integrally combined with devices for controlling the filtration by level measuring

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

A perforated cylindrical screen (1) is caused to rotate about a horizontal axis by the flow of sewage or water from (9) to (10) along a flow channel, the liquid entering and leaving internal chambers (2) generally below the horizontal axis. Solids are removed from the screen by doctor blade (6) which is fixed to counterbalance arms (8). Floats (11) relieve the pressure between the doctor blade (6) and the screen if blockages cause abnormally high water levels. <IMAGE>

Description

SPECIFICATION Flow powered rotary screen This cylindrical screen which is caused to rotate by the passage through it of the water to be screened has been designed to intercept and remove suspended items from flowing water. It has been designed primarily for the removal of floating matter from sewage but could be used in industrial or chemical processes for the extraction of solids from afluid/solid mixture.
Sewage screens are normally employed at sewage treatment works for the removal of floating objects prior to further treatment and in sewers or at sewage pumping stations for improving the quality of the permitted overflow water in excess of the maximum duty capacity, or as an emergency overflow in the event of failure of the system or of the power supply.
The invention refers to a perforated cylindrical screen enclosing sealed peripheral chambers. The screen is free to rotate about a horizontal axis and is mounted at such a level that the water to be screened can enter through the perforations into the chambers on one side near the bottom of the cylinder. Screenings, i.e. the intercepted debris are retained on the external face of the screen and due to the hydraulic static and kinetic forces the screen is induced to rotate so that the full chambers empty on the other side of the vertical axis and more chambers to fill on the first side, thus to continue the operation.
The screenings are removed from the screen face by a counterbalanced doctor blade and are retained in the chamber into which the screen is installed.
To describe the invention more fully I refer to the accompanying drawings: Figure 1 Sectional Elevation Figure2 End Elevation Figure 3 Front Elevation The perforated drum (1) encloses the sealed chambers (2) and is free to revolve on bearings (3) mounted in sidesheets (4). The flow of water is constrained to the perforated drum surface by seals (5) fixed to the sidesheets (4), by the doctor blade (6) which fits closely to the sidesheets (4) and by the under seal (7). The doctor blade (6) is free to rotate about the fulcrum of the counter balance arm (8).
Water flows from inlet (9) to outlet (10) causing the screen (1) to rotate. Screenings intercepted at its face are removed by the doctor blade (6) and are retained within the chamber into which the screen is installed. In the event of blockage due to excessive quantities of debris which could otherwise cause problems of greater consequence, provision is made by floats (11) connected to the counterbalance arms (8) so that the rising water level will utilise the buoyancy of the floats (11) to relieve pressure between the doctor blade (6) and the screen (1). This enables the clearance of the blockage, the subsidence of the water level and the resumption of normal operation. An adjustment lever (12) at each sidesheet (4) facilitates the setting of the doctor blade (6) to within a minimum clearance of the screen (1).
1. A cylindrical screen mounted in free running bearings with its axis horizontal and containing internal peripheral sealed chambers which is caused to rotate by the entry and exit by gravitational force of the screened water into and from the sealed chambers in a vertical arc generally below the horixontal axis, the screenings being removed from the screen face by a self re-setting doctor blade.
2. The apparatus as claimed in claim 1 including the buoyancy method for relieving the operating pressure of the doctor blade.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (2)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Flow powered rotary screen This cylindrical screen which is caused to rotate by the passage through it of the water to be screened has been designed to intercept and remove suspended items from flowing water. It has been designed primarily for the removal of floating matter from sewage but could be used in industrial or chemical processes for the extraction of solids from afluid/solid mixture. Sewage screens are normally employed at sewage treatment works for the removal of floating objects prior to further treatment and in sewers or at sewage pumping stations for improving the quality of the permitted overflow water in excess of the maximum duty capacity, or as an emergency overflow in the event of failure of the system or of the power supply. The invention refers to a perforated cylindrical screen enclosing sealed peripheral chambers. The screen is free to rotate about a horizontal axis and is mounted at such a level that the water to be screened can enter through the perforations into the chambers on one side near the bottom of the cylinder. Screenings, i.e. the intercepted debris are retained on the external face of the screen and due to the hydraulic static and kinetic forces the screen is induced to rotate so that the full chambers empty on the other side of the vertical axis and more chambers to fill on the first side, thus to continue the operation. The screenings are removed from the screen face by a counterbalanced doctor blade and are retained in the chamber into which the screen is installed. To describe the invention more fully I refer to the accompanying drawings: Figure 1 Sectional Elevation Figure2 End Elevation Figure 3 Front Elevation The perforated drum (1) encloses the sealed chambers (2) and is free to revolve on bearings (3) mounted in sidesheets (4). The flow of water is constrained to the perforated drum surface by seals (5) fixed to the sidesheets (4), by the doctor blade (6) which fits closely to the sidesheets (4) and by the under seal (7). The doctor blade (6) is free to rotate about the fulcrum of the counter balance arm (8). Water flows from inlet (9) to outlet (10) causing the screen (1) to rotate. Screenings intercepted at its face are removed by the doctor blade (6) and are retained within the chamber into which the screen is installed. In the event of blockage due to excessive quantities of debris which could otherwise cause problems of greater consequence, provision is made by floats (11) connected to the counterbalance arms (8) so that the rising water level will utilise the buoyancy of the floats (11) to relieve pressure between the doctor blade (6) and the screen (1). This enables the clearance of the blockage, the subsidence of the water level and the resumption of normal operation. An adjustment lever (12) at each sidesheet (4) facilitates the setting of the doctor blade (6) to within a minimum clearance of the screen (1). CLAIMS
1. A cylindrical screen mounted in free running bearings with its axis horizontal and containing internal peripheral sealed chambers which is caused to rotate by the entry and exit by gravitational force of the screened water into and from the sealed chambers in a vertical arc generally below the horixontal axis, the screenings being removed from the screen face by a self re-setting doctor blade.
2. The apparatus as claimed in claim 1 including the buoyancy method for relieving the operating pressure of the doctor blade.
GB08226595A 1981-09-17 1982-09-17 Flow powered rotary screen Expired GB2106003B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08226595A GB2106003B (en) 1981-09-17 1982-09-17 Flow powered rotary screen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8128120 1981-09-17
GB08226595A GB2106003B (en) 1981-09-17 1982-09-17 Flow powered rotary screen

Publications (2)

Publication Number Publication Date
GB2106003A true GB2106003A (en) 1983-04-07
GB2106003B GB2106003B (en) 1985-10-16

Family

ID=26280731

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08226595A Expired GB2106003B (en) 1981-09-17 1982-09-17 Flow powered rotary screen

Country Status (1)

Country Link
GB (1) GB2106003B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5264138A (en) * 1989-07-06 1993-11-23 A. Ahlstrom Corporation Method and apparatus for treating a fiber suspension
GB2309398A (en) * 1996-01-23 1997-07-30 Thames Water Utilities Self-cleaning flow-powered rotary drum
GB2314033B (en) * 1995-03-04 1998-06-24 United Utilities Plc Rotating Screen and Drive Unit
AU2005222550B2 (en) * 2004-10-14 2011-08-11 Bullamon Plains Past Co. Device for removing debris from a water course
WO2018177575A1 (en) * 2017-03-31 2018-10-04 Krones Ag Bottle-processing machine and method for cleaning the pump/nozzle protector of the bottle-processing machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5264138A (en) * 1989-07-06 1993-11-23 A. Ahlstrom Corporation Method and apparatus for treating a fiber suspension
USRE36297E (en) * 1989-07-06 1999-09-14 A. Ahlstrom Corporation Method and apparatus for treating a fiber suspension
GB2314033B (en) * 1995-03-04 1998-06-24 United Utilities Plc Rotating Screen and Drive Unit
GB2309398A (en) * 1996-01-23 1997-07-30 Thames Water Utilities Self-cleaning flow-powered rotary drum
AU2005222550B2 (en) * 2004-10-14 2011-08-11 Bullamon Plains Past Co. Device for removing debris from a water course
WO2018177575A1 (en) * 2017-03-31 2018-10-04 Krones Ag Bottle-processing machine and method for cleaning the pump/nozzle protector of the bottle-processing machine
US11358077B2 (en) 2017-03-31 2022-06-14 Krones Ag Bottle-processing machine and method for cleaning the pump/nozzle protector of the bottle-processing machine

Also Published As

Publication number Publication date
GB2106003B (en) 1985-10-16

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee