CA2033210A1 - Dewatering system with vortex valve - Google Patents
Dewatering system with vortex valveInfo
- Publication number
- CA2033210A1 CA2033210A1 CA 2033210 CA2033210A CA2033210A1 CA 2033210 A1 CA2033210 A1 CA 2033210A1 CA 2033210 CA2033210 CA 2033210 CA 2033210 A CA2033210 A CA 2033210A CA 2033210 A1 CA2033210 A1 CA 2033210A1
- Authority
- CA
- Canada
- Prior art keywords
- valve
- control
- vacuum
- separator
- vortex
- 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.)
- Abandoned
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
Abstract
ABSTRACT OF THE INVENTION
A dewatering system is disclosed in a papermaking machine for removing water from a web such as a paper sheet made of pulp. The drainage system includes a vacuum or suction box, a separator for separating solids and/or liquids from the drainage, and a vortex valve connecting the separator to vacuum. Advantageously, the vortex valve operates to maintain a substantially constant pressure at the separator outlet independently of the gas flow through the valve.
A dewatering system is disclosed in a papermaking machine for removing water from a web such as a paper sheet made of pulp. The drainage system includes a vacuum or suction box, a separator for separating solids and/or liquids from the drainage, and a vortex valve connecting the separator to vacuum. Advantageously, the vortex valve operates to maintain a substantially constant pressure at the separator outlet independently of the gas flow through the valve.
Description
2 ~ 3 3 2 ~
I~PRO~IED DXWATERING SY~3TEM WITH YO~,TEX VALVE ;
BACKGROUND OF THE INVENTION
Field Q f Invention This invention pertains to an improved web dewatering system for the papermaking industry, and more particularly to a dewatering system for a web or the like by applying vacuum thereto through a vortex valve.
Description of the Prior Art - ~
In conventional suction pipe systems in the ~ ~-papermaking industry a vacuum applying means such as a SUGtion pipe or box with one or more slots is positioned ;
in alignment with a web. The suction pipe is positioned so that the web passes over the slot and when the ;
appropriate pressure differential is produced the web `
will be dewatered, the water being drawn into the suction pipe and directed to an appropriate collection location. A separator is used to separate wat~-r and solids from air in the system and the air is exhausted through a mechanical valve which may be operated either - -2 ~ 3 3 2 1 0 remotely or manually. one such system is disclosed in commonly assigned U.S. Patent No. 4,308,077.
One common problem with the prior art systems has been that the mechanical valve had moving parts which were subject to excessive wear and tear and this would break down. A further problem with mechanical valves has been that the suction pipe removed solid, semi-solid and liquid matter from the web and if the separator failed to remove all these impurities from the -~
air in the system, these impurities tended to clog the valve and render it inoperable. Yet another disadvantage of the prior art system was that the mechanical valve could not be controlled precisely and could not be adapted to sophisticated, precise control schemes.
OBJ~CTIVES AND SUMMARY OF THE INVENTION
In view of the above-mentioned disadvantages of the prior art, an objective of the present invention is to , ~ . .
provide a dewatering system using a vortex valve whereby ;~ - the need for the mechanical valve with its moving parts is eliminated.
A further objective of the invention is to provide a dewatering system with a vortex valve which is . '~ ~'''; `''':'' "''`"'~';; .; ,' ':
20332la responsive and easily controlled to permit the use of sophisticated control schemes.
Other objectives and advantages of the invention shall become apparent from the following description of the invention. Briefly, a dewatering system constructed in accordance with the invention includes a suction pipe, a vacuum box, or other vacuum application means of removing water from a web by applying vacuum thereto. The term web is used generically to cover either the pulp from which a paper sheet is formed, or a felt used for drying a paper sheet. The vacuum ;;~
necessary for this operation is applied to the vacuum ;
application means through a control valve and separator means for separating solids and liquids from the gas suctioned through the web. Advantageously, the control valve comprises a vortex valve.
A vortex valve, known also as a vortex amplifier, ~ ~ .-~ , . - .
is a fluidic device which does not have moving parts and seals prone to wear and corrosion during use, and it ;~
comprises a vortex chamber through which a main flow passes radially to emerge at an axial outlet. The main flow can be regulated and controlled by a control flow introduced tangentially into the vortex chamber, as disclosed for example in European Patent Specification :.
20332 ~ 0 ; ~
No 0089186 (corresponding to U S Patent No 4,422, 476) Importantly, the vortex valve provides a uniform pressure at the separator gas outlet substantially ~-~
independent]y of the gas flow exiting from said separator BRIEF DESCRIPTION OF THE FIGURES
The invention will be described further, by way of example, with reference to the accompanying drawing, in which Fiaure 1 is a schematic arrangement of a dewatering system for papermaking constructed in accordance with the invention;
. ~ , ...... .....
Fiaure 2 discloses a first alternate embodiment of - -`
the inventlon;
Figure 3 discloses a second alternate embodiment of the invention and Piaure 4 disclose- a third alternate embodiment of ~ ;-;th-~inventioA
Referring now to the drawings, in Figure 1, a vacuum box or suction pipe 1 in a paperma~ing machine is ~ ~`
u8ed~to dewater a web P trave}ing ov-r the box The box ,~..... ;
'' '~ ' ., :
. - .
2~3321'0 :`
communicates through conduit 2 with a separator 3. One end of the separator 3 drains into a vessel 4 and the opposite end of the separator 3 is connected to a vacuum header 5 by way of a vortex valve or vortex amplifier 6. ;
The vortex valve or amplifier is basically a chamber ;
having supply, outlet and control ports. One such ~ -vortex valve or amplifier is disclosed in European Patent Specification No. 0089186. In the present ~ ~;
arrangement the outlet from the vortex valve 6 is connected to the vacuum header 5. The separator 3 is ;
connected to the inlet of the vortex valve 6. The control port is connected to conduit 8 which in the embodiment of Figure 1 is open to the atmosphere. A `~
vacuum gauge 9 can be included in the flow path from the separator 3 to the inlet of the vortex valve 6.
In use, web P passes over the vacuum box 1 during papermaking. Water drains into the box 1 and the water will contain some other drainage such as pulp which can ~;
clog and block conventional valves hitherto used to control the level of vacuum in the box 1. In the present invention, the water containing drainage is drawn along conduit ~ into the separator 3 to drain into the vessel 4. A fraction of the solid pulp particles can be drawn by the suct1on of the h-ader 5 into the :
6 ~ 3 3 2 1 O ~ ~
vortex valve 6. However, unlike a conventional valve, the vortex valve has relatively large orifices with no moving parts and hence the possibility of blockage by the solid particles and consequent performance degradation is reduced considerably. Valve 6 is designed to maintain a non-adjustable, relatively constant pressure at the outlet of separator 3.
If desired, the pressure set by valve 6 can be adjusted by including an adjustable valve lO in conduit 8 as shown in Figure 2. This valve 10 can be adjusted manually by an operator to set the operating point of valve 6.
Alternatively, as shown in Figure 3 the valve 10 can be a motorized valve which adjusts air flow to the control port of the vortex valve 6 in response to .
signals from a remote location. For example, a pressure ~ :~
transducer 11 may be provided to measure the pressure ..
upstream of valve 6. I'his pressure is then supplied to `.~;`;~ ;
a control unit 12 to control the motorized valve 10. :
Lastly, it may be desirable to apply positive pressure to valve 6, for example, by coupling an air source such as a fan 7 to conduit 8, as shown in Figure 4.
.. : ., :, ~ - -~ ~, ` ~ . ,.''`;~ ; ""'"`, ' . '~' ;' -: ~;
' 2a3~2~
It should be understood that while the drainage system was described as operating in the forming section of the papermaking machine, it will be equally as .
effective in the pressing section, for example, for dewatering a felt.
Obviously, other modifications may be made to the invention without departing from its scope as defined in the appended claims. ~ -.
,~
,~,.;.. ~ .. .. ... .
I~PRO~IED DXWATERING SY~3TEM WITH YO~,TEX VALVE ;
BACKGROUND OF THE INVENTION
Field Q f Invention This invention pertains to an improved web dewatering system for the papermaking industry, and more particularly to a dewatering system for a web or the like by applying vacuum thereto through a vortex valve.
Description of the Prior Art - ~
In conventional suction pipe systems in the ~ ~-papermaking industry a vacuum applying means such as a SUGtion pipe or box with one or more slots is positioned ;
in alignment with a web. The suction pipe is positioned so that the web passes over the slot and when the ;
appropriate pressure differential is produced the web `
will be dewatered, the water being drawn into the suction pipe and directed to an appropriate collection location. A separator is used to separate wat~-r and solids from air in the system and the air is exhausted through a mechanical valve which may be operated either - -2 ~ 3 3 2 1 0 remotely or manually. one such system is disclosed in commonly assigned U.S. Patent No. 4,308,077.
One common problem with the prior art systems has been that the mechanical valve had moving parts which were subject to excessive wear and tear and this would break down. A further problem with mechanical valves has been that the suction pipe removed solid, semi-solid and liquid matter from the web and if the separator failed to remove all these impurities from the -~
air in the system, these impurities tended to clog the valve and render it inoperable. Yet another disadvantage of the prior art system was that the mechanical valve could not be controlled precisely and could not be adapted to sophisticated, precise control schemes.
OBJ~CTIVES AND SUMMARY OF THE INVENTION
In view of the above-mentioned disadvantages of the prior art, an objective of the present invention is to , ~ . .
provide a dewatering system using a vortex valve whereby ;~ - the need for the mechanical valve with its moving parts is eliminated.
A further objective of the invention is to provide a dewatering system with a vortex valve which is . '~ ~'''; `''':'' "''`"'~';; .; ,' ':
20332la responsive and easily controlled to permit the use of sophisticated control schemes.
Other objectives and advantages of the invention shall become apparent from the following description of the invention. Briefly, a dewatering system constructed in accordance with the invention includes a suction pipe, a vacuum box, or other vacuum application means of removing water from a web by applying vacuum thereto. The term web is used generically to cover either the pulp from which a paper sheet is formed, or a felt used for drying a paper sheet. The vacuum ;;~
necessary for this operation is applied to the vacuum ;
application means through a control valve and separator means for separating solids and liquids from the gas suctioned through the web. Advantageously, the control valve comprises a vortex valve.
A vortex valve, known also as a vortex amplifier, ~ ~ .-~ , . - .
is a fluidic device which does not have moving parts and seals prone to wear and corrosion during use, and it ;~
comprises a vortex chamber through which a main flow passes radially to emerge at an axial outlet. The main flow can be regulated and controlled by a control flow introduced tangentially into the vortex chamber, as disclosed for example in European Patent Specification :.
20332 ~ 0 ; ~
No 0089186 (corresponding to U S Patent No 4,422, 476) Importantly, the vortex valve provides a uniform pressure at the separator gas outlet substantially ~-~
independent]y of the gas flow exiting from said separator BRIEF DESCRIPTION OF THE FIGURES
The invention will be described further, by way of example, with reference to the accompanying drawing, in which Fiaure 1 is a schematic arrangement of a dewatering system for papermaking constructed in accordance with the invention;
. ~ , ...... .....
Fiaure 2 discloses a first alternate embodiment of - -`
the inventlon;
Figure 3 discloses a second alternate embodiment of the invention and Piaure 4 disclose- a third alternate embodiment of ~ ;-;th-~inventioA
Referring now to the drawings, in Figure 1, a vacuum box or suction pipe 1 in a paperma~ing machine is ~ ~`
u8ed~to dewater a web P trave}ing ov-r the box The box ,~..... ;
'' '~ ' ., :
. - .
2~3321'0 :`
communicates through conduit 2 with a separator 3. One end of the separator 3 drains into a vessel 4 and the opposite end of the separator 3 is connected to a vacuum header 5 by way of a vortex valve or vortex amplifier 6. ;
The vortex valve or amplifier is basically a chamber ;
having supply, outlet and control ports. One such ~ -vortex valve or amplifier is disclosed in European Patent Specification No. 0089186. In the present ~ ~;
arrangement the outlet from the vortex valve 6 is connected to the vacuum header 5. The separator 3 is ;
connected to the inlet of the vortex valve 6. The control port is connected to conduit 8 which in the embodiment of Figure 1 is open to the atmosphere. A `~
vacuum gauge 9 can be included in the flow path from the separator 3 to the inlet of the vortex valve 6.
In use, web P passes over the vacuum box 1 during papermaking. Water drains into the box 1 and the water will contain some other drainage such as pulp which can ~;
clog and block conventional valves hitherto used to control the level of vacuum in the box 1. In the present invention, the water containing drainage is drawn along conduit ~ into the separator 3 to drain into the vessel 4. A fraction of the solid pulp particles can be drawn by the suct1on of the h-ader 5 into the :
6 ~ 3 3 2 1 O ~ ~
vortex valve 6. However, unlike a conventional valve, the vortex valve has relatively large orifices with no moving parts and hence the possibility of blockage by the solid particles and consequent performance degradation is reduced considerably. Valve 6 is designed to maintain a non-adjustable, relatively constant pressure at the outlet of separator 3.
If desired, the pressure set by valve 6 can be adjusted by including an adjustable valve lO in conduit 8 as shown in Figure 2. This valve 10 can be adjusted manually by an operator to set the operating point of valve 6.
Alternatively, as shown in Figure 3 the valve 10 can be a motorized valve which adjusts air flow to the control port of the vortex valve 6 in response to .
signals from a remote location. For example, a pressure ~ :~
transducer 11 may be provided to measure the pressure ..
upstream of valve 6. I'his pressure is then supplied to `.~;`;~ ;
a control unit 12 to control the motorized valve 10. :
Lastly, it may be desirable to apply positive pressure to valve 6, for example, by coupling an air source such as a fan 7 to conduit 8, as shown in Figure 4.
.. : ., :, ~ - -~ ~, ` ~ . ,.''`;~ ; ""'"`, ' . '~' ;' -: ~;
' 2a3~2~
It should be understood that while the drainage system was described as operating in the forming section of the papermaking machine, it will be equally as .
effective in the pressing section, for example, for dewatering a felt.
Obviously, other modifications may be made to the invention without departing from its scope as defined in the appended claims. ~ -.
,~
,~,.;.. ~ .. .. ... .
Claims (10)
1. In a papermaking machine, a dewatering system comprising:
vacuum applying means for removing water from a web;
separator means for removing drainage from said vacuum applying means and for substantially separating liquids and solids from said drainage;
a source of vacuum for applying vacuum to said separator means; and vortex valve means connecting said source of vacuum to said separator means, said vortex valve means being constructed and arranged to provide a uniform pressure to said separator means independently of the gas flowing therethrough.
vacuum applying means for removing water from a web;
separator means for removing drainage from said vacuum applying means and for substantially separating liquids and solids from said drainage;
a source of vacuum for applying vacuum to said separator means; and vortex valve means connecting said source of vacuum to said separator means, said vortex valve means being constructed and arranged to provide a uniform pressure to said separator means independently of the gas flowing therethrough.
2. The system of claim 2 wherein said vortex valve means includes an control port.
3. The system of claim 2 wherein said control port is open to atmosphere.
4. The system of claim 2 wherein said control port is connected to a control valve, said control valve being constructed and arranged to adjust the pressure at said separator means.
5. The system of claim 4 wherein said control valve is open to atmosphere.
6. The system of claim 4 further comprising control means for adjusting said control valve.
7. The system of claim 6 wherein said control means includes a pressure sensing means for sensing pressure upstream of said vortex valve, and control apparatus for controlling said control valve in accordance with said sensed pressure.
8. The system of claim 2 further comprising a source of air for applying positive pressure to said control port.
9. The system of claim 8 further comprising a control valve connected between said source of air and said control port for adjusting said positive pressure.
10. The system of claim 8 wherein said source of air comprises a fan.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB898914438A GB8914438D0 (en) | 1989-06-23 | 1989-06-23 | An improved fluidic control system |
| GB8914438.0 | 1989-06-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2033210A1 true CA2033210A1 (en) | 1990-12-24 |
Family
ID=10658938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2033210 Abandoned CA2033210A1 (en) | 1989-06-23 | 1990-06-21 | Dewatering system with vortex valve |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0433434A4 (en) |
| JP (1) | JPH04500395A (en) |
| AU (1) | AU6030890A (en) |
| BR (1) | BR9006817A (en) |
| CA (1) | CA2033210A1 (en) |
| FI (1) | FI905016A0 (en) |
| GB (2) | GB8914438D0 (en) |
| WO (1) | WO1991000388A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2714675C (en) | 2010-07-16 | 2017-05-09 | Ipex Technologies Inc. | Connector assemblies for flow restricting apparatuses |
| US8757667B2 (en) | 2010-07-16 | 2014-06-24 | Ipex Technologies Inc. | Adapters and connector assemblies for flow managing apparatuses |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3024839A (en) * | 1959-05-18 | 1962-03-13 | Beloit Iron Works | Suction regulating means |
| US3447383A (en) * | 1966-01-04 | 1969-06-03 | United Aircraft Corp | Twin vortex angular rate sensor |
| US3461908A (en) * | 1967-04-06 | 1969-08-19 | Broughton Corp | Vacuum relief valve |
| GB1192965A (en) * | 1967-08-15 | 1970-05-28 | Rolls Royce | Improvements in Fluidics |
| GB1257916A (en) * | 1968-08-09 | 1971-12-22 | ||
| US3563260A (en) * | 1968-11-08 | 1971-02-16 | Sperry Rand Corp | Power transmission |
| GB1300406A (en) * | 1969-06-25 | 1972-12-20 | Atomic Energy Authority Uk | Improvements in fluid flow control devices |
| GB1469405A (en) * | 1974-03-18 | 1977-04-06 | Atomic Energy Authority Uk | Fluidic devices |
| US4308077A (en) * | 1979-12-06 | 1981-12-29 | Albany International Corp. | Constant flow felt dewatering system |
| US4329201A (en) * | 1979-12-06 | 1982-05-11 | Albany International Corp. | Constant vacuum felt dewatering system |
| US4447924A (en) * | 1982-02-18 | 1984-05-15 | Albany International Corp. | Moisture control system for controlling the amount of chemical added to a fabric |
| EP0089186B1 (en) * | 1982-03-16 | 1985-10-30 | United Kingdom Atomic Energy Authority | Fluidic control device |
| US4810264A (en) * | 1984-02-23 | 1989-03-07 | Shell Oil Company | Process for cleaning and splitting particle-containing fluid with an adjustable cyclone separator |
| US4774974A (en) * | 1985-04-10 | 1988-10-04 | Teter Bruce W | System for removing asbestos from structures |
| NO171576C (en) * | 1987-08-28 | 1993-03-31 | Atomic Energy Authority Uk | PROCEDURE FOR AA REGULATING THE FLOW IN A FLUID PIPE |
| US4817863A (en) * | 1987-09-10 | 1989-04-04 | Honeywell Limited-Honeywell Limitee | Vortex valve flow controller in VAV systems |
-
1989
- 1989-06-23 GB GB898914438A patent/GB8914438D0/en active Pending
-
1990
- 1990-06-21 BR BR909006817A patent/BR9006817A/en unknown
- 1990-06-21 JP JP51012590A patent/JPH04500395A/en active Pending
- 1990-06-21 GB GB9013894A patent/GB2233473A/en not_active Withdrawn
- 1990-06-21 AU AU60308/90A patent/AU6030890A/en not_active Abandoned
- 1990-06-21 WO PCT/US1990/003546 patent/WO1991000388A1/en not_active Application Discontinuation
- 1990-06-21 CA CA 2033210 patent/CA2033210A1/en not_active Abandoned
- 1990-06-21 EP EP19900911100 patent/EP0433434A4/en not_active Withdrawn
- 1990-10-12 FI FI905016A patent/FI905016A0/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| GB2233473A (en) | 1991-01-09 |
| BR9006817A (en) | 1991-08-06 |
| JPH04500395A (en) | 1992-01-23 |
| GB8914438D0 (en) | 1989-08-09 |
| EP0433434A4 (en) | 1991-10-23 |
| EP0433434A1 (en) | 1991-06-26 |
| AU6030890A (en) | 1991-01-17 |
| FI905016A0 (en) | 1990-10-12 |
| GB9013894D0 (en) | 1990-08-15 |
| WO1991000388A1 (en) | 1991-01-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |