CA1134187A - Piston valve steam distributor - Google Patents
Piston valve steam distributorInfo
- Publication number
- CA1134187A CA1134187A CA383,265A CA383265A CA1134187A CA 1134187 A CA1134187 A CA 1134187A CA 383265 A CA383265 A CA 383265A CA 1134187 A CA1134187 A CA 1134187A
- Authority
- CA
- Canada
- Prior art keywords
- steam
- header
- piston
- pipe
- chamber
- 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.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/008—Steam showers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0272—Wet presses in combination with suction or blowing devices
Landscapes
- Paper (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An apparatus to permit a gas to be fed from a header to a chamber adjacent the header. The apparatus has a pipe extending through the header. There is an inlet for the pipe in the header and an outlet for the pipe in the chamber. A piston is positioned within the pipe and is reciprocable between a first position where it closes the inlet and a second position where the inlet is unobstructed.
The apparatus includes a device to move the piston between the first and second positions. The apparatus gives good transfer of steam and effective control of the steam along the apparatus.
An apparatus to permit a gas to be fed from a header to a chamber adjacent the header. The apparatus has a pipe extending through the header. There is an inlet for the pipe in the header and an outlet for the pipe in the chamber. A piston is positioned within the pipe and is reciprocable between a first position where it closes the inlet and a second position where the inlet is unobstructed.
The apparatus includes a device to move the piston between the first and second positions. The apparatus gives good transfer of steam and effective control of the steam along the apparatus.
Description
This invention relates to an apparatus to permit a gas to be fed from a header to a chamber. The invention finds particular application in paper making for the appli-cation of steam to a paper sheet.
The steam heating of a paper sheet is widely practised in paper making. The increase in sheet tempera-ture that results provides increased drainage rates for the ~ -~
water thus reducing the amount of water to be evaporated in the drier section. Water drainage is improved by the application of steam principally because the heating of the sheet reduces the viscosity of the water, thus increasing the ability of the water to flow. Most of the heat transfer takes place when the steam condenses in the sheet. The condensation of the steam transforms the latent heat of the steam to sensible heat in the water contained by the sheet.
A particular advantage of the steam heating of the paper sheet is that the amount of steam applied may be varied across the width of the sheet, in the cross machine direction, so that the cross machine moisture profile of the sheet may be modified. This is usually carried out to ensùre that the moisture profile at the reel is uniform.
Apparatus are well known in the paper making art that can sense the moisture profile of a sheet of paper. If such an apparatus is positioned over the paper sheet, downstream of a steam distributor able to control the moisture profile, then after measuring the water profile in the sheet, steam can be applied in varying amounts on a selective basis across the sheet, thus achieving the required uniform mois-ture profile at the reel.
.
It is known to divide a steam distributor into compartments and to control the supply of steam to each compartment, thus controlling the moisture profile of the sheet.
The present invention provides a simple apparatus having an efficient transfer of steam from a source of steam to a chamber. The steam is passed from the chamber to the paper sheet. In a preferred aspect, the invention provides an apparatus in which effecting control of the moisture profile of the sheet can be achieved.
Accordingly, the present invention provides an apparatus to permit gas to be fed from a header to a chamber adjacent the header, the apparatus comprising: a pipe extending through the header; an inlet for the pipe in the header; an outlet for the pipe in the chamber; a piston within the pipe and reciprocable between a first position where it closes the inlet and a second position where the inlet is unobstructed; and means to move the piston between the first and second positions.
In a preferred embodiment the chamber is divided into a plurality of compartments with a pipe extending through the header to each compartment of the chamber.
Aspects of the invention are illustrated, merely by way of example, in the accompanying drawings in which:
Figure 1 is a section to an apparatus according to the present invention;
Figure 2 illustrates the principal components of the present invention;
~ ~3~ Y
Figure 3 illustrates a further apparatus according to the present invention; and Figure 4 is a section along the line 4-4 in Figure 3.
Referring to the drawings, Figure 1 illustrates a sophisticated apparatus particularly useful in the press section of a paper making machine. The apparatus is an embodiment of the apparatus described and claimed in my Canadian Patent Application Serial No. 371,823, filed 10 February 26th, 1981. The apparatus comprises a header into which steam is introduced. On the exterior of the header is formed a first chamber 4 and a second chamber 6. Steam passes from the header 2 to the first chamber 4 through outlets 8. From the first chamber 4 steam passes through further outlets 10 to act as a steam curtain to prevent the drawing in of air by the fast moving paper sheet 12. This ;
feature of the illustrated apparatus does not form part of the preser.t invention and will not be discussed further.
The resistance to the drawing in of the air is facilitated by a doctor edge 14, also not a feature of the present invention. ;
Steam passes from the header 2 to the second chamber 6 and the second chamber 6 is divided into a plurality of compartments by partitions 16. Steam passes from the second chamber 6 outwardly through openings 18 where the main heating of the sheet takes place. The provision of compartments permits profiling of the moisture content in the paper sheet in a manner that will be described later.
The supply of steam between the header 2 and the ~l~3~
second chamber 6 is through a pipe 20 extending from outside the apparatus through the header 2 to the second chamber 6.
The pipe 20 has an inlet 22 for steam in the header 2 and an outlet 24 for steam in the second chamber 6. The inlet is regulated by a piston 26 provided with sealing rings 28. A
connecting rod 30 extends from the piston 26 to a regulator 32. The regulator 32 is mounted by the provision of a flange 34 on the end of pipe 20 and a corresponding flange 36 on the regulator 32. The two flanges may be bolted together. The regulator is pneumatically operated by a supply of compressed air available in any paper mill. As -shown more particularly in Figure 2 the structure connecting rod 30 extends through a gland structure comprising an externally threaded member 38 engaged by internally threaded member 40. There are packing rings 42 and sealing members 44 located by an externally threaded member 46 engaging within internally threaded member 40. The actuator is located by the base of its bracket 48 (see Figure 1) being located between flange 36 and the internally threaded member In operation a predetermined amount of steam,controlled by the position of the piston 26, enters inlet 22 and passes through pipe 20 to the second chamber 16. The second chamber being divided into compartments the amount of steam fed across the apparatus can be controlled. The amount of steam fed to each compartment is, of course, controlled by the position of the piston 26 in each pipe 20.
In a typical arrangement the actuators 32 will be attached to a supply of compressed air. Control of the air supply ,. , ' ., ',.... ,, . "'~ ' . ' ' ~3~87 will be at a control station. Information from a moisture profile sensor positioned downstream of the distributor of the invention is fed to the same control station. Profile sensors are well known in the art. An operator at the station will vary the supply of air to individual actuators depending on the moisture profile. By this means a desired moisture profile can be achieved.
Heat loss is reduced by insulation 50.
Figures 3 and 4 illustrate a simpler adaptation of the device for use particularly on a flat paper sheet 52 moving in machine direction A. Steam is supplied to a header 54 through a steam supply pipe 56. A surrounding chamber 58 is defined by housing 60 and there are end plates ~-~
62 provided with holes 64 whereby the apparatus may be located in position. Partition 66 divide chamber 58 into a plurality of compartments 67.
A pipe 68 passes through header 54 into chamber 58. Pipe 68 has an inlet 70 in header 54 and an outlet 72 in chamber 58. A piston 74 is movable within pipe 68 to ~ ;
open or close inlet 70. Piston 74 is mounted on a rod 76 extending through a gland structure 78 to hand wheel 80.
Gland structure 78 resembles the gland structure shown in Figure 2 but there is a threaded collar 82 to engage a threaded portion 84 on rod 76. Thus rotation of wheel 80 moves the rod 76 and then the piston 74 up and down. That is control of the piston 74 is by hand. Thus the informa-tion fed by the sensing device is read by the skilled man who then varies the valve settings as required to obtain the necessary moisture profile. The steam leaves the chamber 58 ~3~
through openings 79 in a bottom plate 81 of the chamber 58.
The present invention thus provides a simple yet effective means of controlling the supply of steam from a header to a chamber.
. ~
,
The steam heating of a paper sheet is widely practised in paper making. The increase in sheet tempera-ture that results provides increased drainage rates for the ~ -~
water thus reducing the amount of water to be evaporated in the drier section. Water drainage is improved by the application of steam principally because the heating of the sheet reduces the viscosity of the water, thus increasing the ability of the water to flow. Most of the heat transfer takes place when the steam condenses in the sheet. The condensation of the steam transforms the latent heat of the steam to sensible heat in the water contained by the sheet.
A particular advantage of the steam heating of the paper sheet is that the amount of steam applied may be varied across the width of the sheet, in the cross machine direction, so that the cross machine moisture profile of the sheet may be modified. This is usually carried out to ensùre that the moisture profile at the reel is uniform.
Apparatus are well known in the paper making art that can sense the moisture profile of a sheet of paper. If such an apparatus is positioned over the paper sheet, downstream of a steam distributor able to control the moisture profile, then after measuring the water profile in the sheet, steam can be applied in varying amounts on a selective basis across the sheet, thus achieving the required uniform mois-ture profile at the reel.
.
It is known to divide a steam distributor into compartments and to control the supply of steam to each compartment, thus controlling the moisture profile of the sheet.
The present invention provides a simple apparatus having an efficient transfer of steam from a source of steam to a chamber. The steam is passed from the chamber to the paper sheet. In a preferred aspect, the invention provides an apparatus in which effecting control of the moisture profile of the sheet can be achieved.
Accordingly, the present invention provides an apparatus to permit gas to be fed from a header to a chamber adjacent the header, the apparatus comprising: a pipe extending through the header; an inlet for the pipe in the header; an outlet for the pipe in the chamber; a piston within the pipe and reciprocable between a first position where it closes the inlet and a second position where the inlet is unobstructed; and means to move the piston between the first and second positions.
In a preferred embodiment the chamber is divided into a plurality of compartments with a pipe extending through the header to each compartment of the chamber.
Aspects of the invention are illustrated, merely by way of example, in the accompanying drawings in which:
Figure 1 is a section to an apparatus according to the present invention;
Figure 2 illustrates the principal components of the present invention;
~ ~3~ Y
Figure 3 illustrates a further apparatus according to the present invention; and Figure 4 is a section along the line 4-4 in Figure 3.
Referring to the drawings, Figure 1 illustrates a sophisticated apparatus particularly useful in the press section of a paper making machine. The apparatus is an embodiment of the apparatus described and claimed in my Canadian Patent Application Serial No. 371,823, filed 10 February 26th, 1981. The apparatus comprises a header into which steam is introduced. On the exterior of the header is formed a first chamber 4 and a second chamber 6. Steam passes from the header 2 to the first chamber 4 through outlets 8. From the first chamber 4 steam passes through further outlets 10 to act as a steam curtain to prevent the drawing in of air by the fast moving paper sheet 12. This ;
feature of the illustrated apparatus does not form part of the preser.t invention and will not be discussed further.
The resistance to the drawing in of the air is facilitated by a doctor edge 14, also not a feature of the present invention. ;
Steam passes from the header 2 to the second chamber 6 and the second chamber 6 is divided into a plurality of compartments by partitions 16. Steam passes from the second chamber 6 outwardly through openings 18 where the main heating of the sheet takes place. The provision of compartments permits profiling of the moisture content in the paper sheet in a manner that will be described later.
The supply of steam between the header 2 and the ~l~3~
second chamber 6 is through a pipe 20 extending from outside the apparatus through the header 2 to the second chamber 6.
The pipe 20 has an inlet 22 for steam in the header 2 and an outlet 24 for steam in the second chamber 6. The inlet is regulated by a piston 26 provided with sealing rings 28. A
connecting rod 30 extends from the piston 26 to a regulator 32. The regulator 32 is mounted by the provision of a flange 34 on the end of pipe 20 and a corresponding flange 36 on the regulator 32. The two flanges may be bolted together. The regulator is pneumatically operated by a supply of compressed air available in any paper mill. As -shown more particularly in Figure 2 the structure connecting rod 30 extends through a gland structure comprising an externally threaded member 38 engaged by internally threaded member 40. There are packing rings 42 and sealing members 44 located by an externally threaded member 46 engaging within internally threaded member 40. The actuator is located by the base of its bracket 48 (see Figure 1) being located between flange 36 and the internally threaded member In operation a predetermined amount of steam,controlled by the position of the piston 26, enters inlet 22 and passes through pipe 20 to the second chamber 16. The second chamber being divided into compartments the amount of steam fed across the apparatus can be controlled. The amount of steam fed to each compartment is, of course, controlled by the position of the piston 26 in each pipe 20.
In a typical arrangement the actuators 32 will be attached to a supply of compressed air. Control of the air supply ,. , ' ., ',.... ,, . "'~ ' . ' ' ~3~87 will be at a control station. Information from a moisture profile sensor positioned downstream of the distributor of the invention is fed to the same control station. Profile sensors are well known in the art. An operator at the station will vary the supply of air to individual actuators depending on the moisture profile. By this means a desired moisture profile can be achieved.
Heat loss is reduced by insulation 50.
Figures 3 and 4 illustrate a simpler adaptation of the device for use particularly on a flat paper sheet 52 moving in machine direction A. Steam is supplied to a header 54 through a steam supply pipe 56. A surrounding chamber 58 is defined by housing 60 and there are end plates ~-~
62 provided with holes 64 whereby the apparatus may be located in position. Partition 66 divide chamber 58 into a plurality of compartments 67.
A pipe 68 passes through header 54 into chamber 58. Pipe 68 has an inlet 70 in header 54 and an outlet 72 in chamber 58. A piston 74 is movable within pipe 68 to ~ ;
open or close inlet 70. Piston 74 is mounted on a rod 76 extending through a gland structure 78 to hand wheel 80.
Gland structure 78 resembles the gland structure shown in Figure 2 but there is a threaded collar 82 to engage a threaded portion 84 on rod 76. Thus rotation of wheel 80 moves the rod 76 and then the piston 74 up and down. That is control of the piston 74 is by hand. Thus the informa-tion fed by the sensing device is read by the skilled man who then varies the valve settings as required to obtain the necessary moisture profile. The steam leaves the chamber 58 ~3~
through openings 79 in a bottom plate 81 of the chamber 58.
The present invention thus provides a simple yet effective means of controlling the supply of steam from a header to a chamber.
. ~
,
Claims (4)
1. A steam distribution apparatus comprising:
a steam supply header;
a chamber adjacent the header to receive steam from the header;
partitions dividing the chamber into a plurality of compartments;
outlets in the compartments whereby the steam may be fed from the compartments;
means to control the amount of steam fed to each compartment so as to enable variation of the amount of steam fed from each compartment, said means comprising:
a pipe extending through the header into each compartment;
an inlet for each pipe in the header;
an outlet for each pipe in a compartment;
a piston within each pipe reciprocal between a first position, where it closes the inlet, and a second position, where the inlet is unobstructed; and means to move the piston between the first and second positions.
a steam supply header;
a chamber adjacent the header to receive steam from the header;
partitions dividing the chamber into a plurality of compartments;
outlets in the compartments whereby the steam may be fed from the compartments;
means to control the amount of steam fed to each compartment so as to enable variation of the amount of steam fed from each compartment, said means comprising:
a pipe extending through the header into each compartment;
an inlet for each pipe in the header;
an outlet for each pipe in a compartment;
a piston within each pipe reciprocal between a first position, where it closes the inlet, and a second position, where the inlet is unobstructed; and means to move the piston between the first and second positions.
2. Apparatus as claimed in claim 1 in which the means to move the piston comprises a rod extending from the piston;
a sealer around the rod to prevent escape of gas;
and an actuator attached to the end of the rod remote from the piston.
a sealer around the rod to prevent escape of gas;
and an actuator attached to the end of the rod remote from the piston.
3. Apparatus as claimed in claim 2 in which the actuator is a hand wheel external of the apparatus and engaged on a threaded shaft whereby rotation of the wheel moves the piston.
4. Apparatus as claimed in claim 2 in which the actuator is operated by compressed air acting on a dia-phragm, the rod being attached to the diaphragm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA383,265A CA1134187A (en) | 1981-08-05 | 1981-08-05 | Piston valve steam distributor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA383,265A CA1134187A (en) | 1981-08-05 | 1981-08-05 | Piston valve steam distributor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1134187A true CA1134187A (en) | 1982-10-26 |
Family
ID=4120615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA383,265A Expired CA1134187A (en) | 1981-08-05 | 1981-08-05 | Piston valve steam distributor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1134187A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0708203A3 (en) * | 1994-10-19 | 1997-01-15 | Vib Apparatebau Gmbh | Device and method for humidifying a moving web material |
| CN103939668A (en) * | 2014-05-09 | 2014-07-23 | 浙江汉普新材料技术有限公司 | Regulating valve on steam pipeline in paper humidifying box |
-
1981
- 1981-08-05 CA CA383,265A patent/CA1134187A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0708203A3 (en) * | 1994-10-19 | 1997-01-15 | Vib Apparatebau Gmbh | Device and method for humidifying a moving web material |
| US5778559A (en) * | 1994-10-19 | 1998-07-14 | V.I.B. Apparatebau Gmbh | Device and process for moistening a running material web |
| CN103939668A (en) * | 2014-05-09 | 2014-07-23 | 浙江汉普新材料技术有限公司 | Regulating valve on steam pipeline in paper humidifying box |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |