FEEDER CHANNEL FOR DILUTING FLUID
Feeder channel for diluting a fluid, in connection with a headbox of a paper machine includes one or more reservoir-type spaces for receiving diluting fluid. An aperture is formed in the reservoir-type space, wherein the diluting fluid can be conducted into the stock flow space of the headbox. One or more shut-off/adjustment members, for adjusting the flow of diluting fluid, is fitted into the feeder channel. The shut-off/adjustment member is a shut-off/adjustment device that can be moved in the longitudinal direction in the aperture formed in the wall of the reservoir-type space. The shut-off/adjustment member that is partly or wholly inside the aperture with one or more cavities and/or recesses, via which the flow of diluting fluid from the reservoir-type space either directly or via an intermediate piece into the stock flow space can be adjusted by moving the shut-off/adjustment member in the aperture.
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The object of the invention is a feeder channel for diluting fluid, such as for diluting water, as defined in the preamble of claim 1, which feeder channel is fitted in connection with the headbox of a paper machine for feeding diluting water into the stock flow.
Some solutions are known in the art for feeder channels for diluting fluid, such as for diluting water, which feeder channels are in connection with the headbox of a paper machine and have the purpose of supplying diluting water to the stock flow. One such solution is described in publication FI 112260 B, which publication presents a proportioning device for the headbox of a paper machine, which proportioning device is used, inter alia, to feed fluids into the stock flow (to the input point of the stock) of the paper machine. The solution presented in the publication comprises at least one chamber, which functions as a receiving space for flowing medium, and in connection with the chamber are proportioning apertures in connection with which are throttling devices with which the passage of a flowing substance, i.e. the diluting water of a paper machine, into that space of the headbox in which the stock suspension flows can be adjusted. In the solution according to the publication a throttling device comprises a conical seating means, which is in connection with the proportioning aperture such that the flow can be adjusted (or, if desired, the flow can be prevented completely) by moving the seating means in the proportioning aperture.
Solutions according to prior art have certain drawbacks. A problem in solutions according to prior art is that by means of them a precisely and reliably adjusted passage of diluting fluid into the stock flow space is not obtained, because the throttling device in them is usually conical and impurities that are in the diluting water can remain between the conical throttling means and the proportioning aperture. Especially if retention is used, i.e. a fluid that can contain particles is used as the diluting water, this might cause a gap to remain between the throttling means and the edges of the proportioning aperture, in which case the passage of diluting fluid into the stock flow cannot be prevented or adjusted accurately.
Another drawback of prior art is the sensitivity to vibration of the seating of the proportioning device (or in other words of the shut-off/adjustment means) for diluting fluid as presented in the aforementioned publication, and of its arm (at the end of which arm the seating is). The seating presented in the publication is a conical seating that is at the end of a long protrusion, i.e. an arm. The seating does not receive support from its proportioning aperture (from the edges of the proportioning aperture) in the lateral medium flow produced as a result of the flow passing via the aperture (the flow produces excitations), and the seating is then, owing to that, extremely sensitive in relation to lateral vibration. For eliminating vibration the arm of the seating should be thick in cross-section and the arm should be short and/or the support of the arm should be rigid, and this is very undesirable.
In addition, in prior-art solutions the diluting fluid is conducted from the storage space for diluting fluid into the stock flow space containing stock suspension via some intermediate piece, and owing to this additional parts, such as piping et cetera are needed in it.
The aim of the present invention is to achieve a new type of solution for a feeder channel for diluting water, with which the problems occurring in prior-art solutions can be avoided.
BRIEF DESCRIPTION OF THE INVENTIONThe solution according to the invention is characterized by what is disclosed in the characterization part of the independent claim 1. Additionally, the solution according to the invention is characterized by what is disclosed in the dependent claims 2-18.
The solution according to the invention now being presented has some significant advantages when it is compared to solutions that are known and used.
With the solution now presented such a solution for a feeder channel for diluting fluid, such as for diluting water, is achieved that with it diluting fluid can be precisely, reliably and in a simple manner fed directly into the stock flow by means of the feeder channel.
In the solution according to the invention the shut-off/adjustment means fitted into the feeder channel for diluting fluid, with which means the flow of diluting fluid into the stock flow space is adjusted, is shaped such that with it the flow of diluting fluid can be rather accurately and effectively adjusted.
In the solution according to the invention the shut-off/adjustment means fitted into the feeder channel, with which means the flow of diluting fluid into the stock flow space is adjusted, is also insensitive in relation to vibration, i.e. it is possible in it to effectively prevent very detrimental and undesirable vibration of the shut-off/adjustment means.
In the solution according to the invention the shut-off/adjustment means receives support from the inside surface/inside surfaces of the aperture that is in the wall of the feeder channel and lateral and detrimental movement of the arm of the shut-off/adjustment means, and at the same time of the shut-off/adjustment means, is prevented and detrimental vibration of the adjustment means is not able to initiate. In the solution according to the invention support on the inside surfaces of the aperture occurs at least always during operation of the shut-off/adjustment means, i.e. when the diluting fluid flows from the diluting fluid space into the stock flow space. In addition, the diluting fluid in the gap that is between the adjustment means and the side surface/side surfaces of the aperture brings about hydrodynamic damping, i.e. this also prevents vibration of the shut-off/adjustment means and of the arm of same.
Another advantage of the invention is that it is durable, operationally reliable, and wholly or at least partly service-free. Another advantage of the invention is that it is easy to implement.
In the following, the invention will be described in more detail by the aid of some examples of its embodiment with reference to the drawings 1-9b, wherein,
The feeder channel 1 according to the invention for diluting fluid, such as for diluting water, presented by
One or more shut-off/adjustment means 5, with which the flow of diluting fluid via the aforementioned aperture 13 can be adjusted and/or the flow can be prevented, is fitted into the feeder channel 1, as is presented in the situation of
The shut-off/adjustment means 5 is a movable (shut-off/adjustment means being partly or wholly inside the aperture) shut-off/adjustment means 5 that is in connection with the aperture 13 formed in the wall 4 (preferably the base of same) of the reservoir-type space, which shut-off/adjustment means comprises one or more cavities and/or recesses 6, 14 (
According to
In the solution according to the invention, according to
With the actuator means 3, which is fitted directly or indirectly to the wall 4, a linear movement of the shut-off/adjustment means 5 is achieved, i.e. a movement in the longitudinal direction of the aperture, as presented in
The shut-off/adjustment means 5 can be such that it is possible to detach it from the connector part 16, it can contain e.g. threads (not shown in figure), with which it is screwed into/onto the end of the connector part 16. The shut-off/adjustment means 5 can, however, also be fastened in a fixed manner to the connector part 16. In
According to what is presented by
The necks 5″ remaining between the cavities and/or recesses 6 in the shut-off/adjustment means 5 comprise support surfaces 6″ (the side surface/side surfaces of the shut-off/adjustment means) that can rest on the inside surface 13′ of the aperture 13 and prevent vibration of the adjustment means 5 (and of the connector part 16), which vibration is caused by the flow of diluting fluid (lateral forces and displacements, i.e. bending, in the adjustment means 5 and in the connector part 16 are caused by the transverse fluid flow, and this in turn produces vibration).
The support surface or support surfaces 6″ thus function as countersurfaces to the inside surface/surfaces 13′ (of the aperture 13).
However, in order for the shut-off/adjustment means to be able to move in the longitudinal direction of the aperture 13, such as is described with an arrow in
According to the perspective figure presented by
The cavities and/or recesses 6, 14 in the shut-off/adjustment means 5 can be formed in the shut-off/adjustment means such that they expand in the direction of the stock flow space 9, i.e. in other words their cross-sectional area increases in the direction of the stock flow space, and from
From what is presented by
From
Without being limited to the shapes presented by
-
FIG. 3 a presents a bottom view of an elliptical shut-off/adjustment means, in which the elliptical shape of the shut-off/adjustment means is seen, andFIG. 3 b presents a perspective sketch of the shut-off/adjustment means at the end of a connector part 16, which shut-off/adjustment means comprises necks 5′ which comprise support surfaces 6″.FIG. 4 a presents a bottom view of a second elliptical shut-off/adjustment means 5, in which the elliptical shape of the shut-off/adjustment means is seen, and which shut-off/adjustment means comprises cavities/recesses 6, 14 of a semicircular type, and inFIG. 4 b a perspective sketch is seen of the shut-off/adjustment means at the end of a connector part 16, which shut-off/adjustment means comprises support surfaces 6″.FIG. 5 a presents a bottom view of a quadratic shut-off/adjustment means comprising rounded corners, which shut-off/adjustment means comprises triangular cavities/recesses 14, and inFIG. 5 b a perspective sketch is seen of the shut-off/adjustment means at the end of a connector part 16, which shut-off/adjustment means comprises support surfaces 6″.FIG. 6 a presents a bottom view of a second quadratic shut-off/adjustment means comprising rounded corners, which shut-off/adjustment means comprises triangular cavities/recesses 14, and inFIG. 6 b a perspective sketch is seen of the shut-off/adjustment means at the end of a connector part 16, which shut-off/adjustment means comprises support surfaces 6″.FIG. 7 a presents a bottom view of a third quadratic shut-off/adjustment means comprising triangular cavities/recesses 14, and inFIG. 7 b a perspective sketch is seen of the shut-off/adjustment means at the end of a connector part 16, which shut-off/adjustment means comprises support surfaces 6″.FIG. 8 a presents a bottom view of a fourth quadratic shut-off/adjustment means having rounded corners, which shut-off/adjustment means comprises triangular cavities/recesses, support surfaces 6″ and inFIG. 8 b a perspective sketch is seen of the shut-off/adjustment means at the end of a connector part 16, which shut-off/adjustment means comprises support surfaces 6″.FIG. 9 a presents a bottom view of a second circular shut-off/adjustment means comprising cavities/recesses 14 of a semi-circular type and inFIG. 9 b a perspective sketch is seen of the shut-off/adjustment means at the end of a connector part 16, which shut-off/adjustment means has necks 5′ remaining between the cavities/recesses, which necks comprise support surfaces 6″,
It is obvious to the person skilled in the art that the different embodiments of the invention are not limited solely to the examples described above, and that they may therefore be varied within the scope of the claims presented below.
The characteristic features possibly presented in the description in conjunction with other characteristic features can also, if necessary, be used separately to each other.
The solution according to the invention can possibly be implemented also such that one or more cavities and/or recesses are formed in the edge or edges of the diluting aperture, instead of in the shut-off/adjustment means, and in this case there do not necessarily need to be any apertures or recesses at all in the shut-off/adjustment means.
In the solution according to the invention the shut-off/adjustment means can comprise various sealings.
In the solution according to the invention the shut-off/adjustment means can be of metal material, plastic material, composite material, or also of some other material suited for a shut-off/adjustment means.
In the solution according to the invention there can be one or more feeder channels in a headbox, when viewing the headbox as seen over its lateral direction, or correspondingly from the whole (effective) width of the headbox. The feeder channel can also be divided into zones, in which case one or more shut-off/adjustment means of the diluting fluid flow can be fitted into each zone. In the solution according to the invention there can be the desired number of feeder apertures for diluting water, their number or position is not in any way limited, but instead this is determined by each target of application.
Claims
1. Feeder channel (1) for diluting fluid, such as for diluting water, which feeder channel is in connection with the headbox (10) of a paper machine and comprises one or more reservoir-type spaces (7), such as a chamber, for receiving diluting fluid, which space comprises one or more walls (4), and that an aperture (13) is formed in the reservoir-type space (7), via which aperture the diluting fluid can be conducted into the stock flow space (9) of the headbox, and that one or more shut-off/adjustment means (5), with which the flow of diluting fluid via the aforementioned aperture (13) can be adjusted, is fitted into the feeder channel (1), and that the shut-off/adjustment means (5) is a shut-off/adjustment means that can be moved in the longitudinal direction of an aperture that is in connection with the aperture (13) formed in the wall (4) of the reservoir-type space, characterized in that in the shut-off/adjustment means (5) that is partly or wholly inside the aperture there are one or more cavities and/or recesses (6, 14)) via which the flow of diluting fluid from the reservoir-type space (7) either directly or via an intermediate piece (11) into the stock flow space (9) can be adjusted by moving the shut-off/adjustment means (5) in the aperture (13), and in that the shut-off/adjustment means (5) comprises a support surface or support surfaces (6″), which can rest on the inside surface (13′) of the aperture (13) for preventing vibration of the adjustment means (5) caused by the flow of the diluting fluid at least during operation of the shut-off/adjustment means.
2. Feeder channel for diluting fluid according to claim 1, characterized in that the support surface/support surfaces (6″) of the shut-off/adjustment means (5) are the side surface/side surfaces of the shut-off/adjustment means (5).
3. Feeder channel for diluting fluid according to claim 1, characterized in that the necks (5′) remaining between the cavities and/or recesses (6) comprise support surfaces (6″) that can rest on the inside surface (13′) of the aperture (3) for preventing vibration.
4. Feeder channel for diluting fluid according to claim 1, characterized in that the part comprising the support surface/support surfaces (6″) of the shut-off/adjustment means (5), which part can rest on the inside surface (13′) of the aperture (13), or alternatively the whole shut-off/adjustment means (5), is smaller in diameter than the diameter of the aperture (13).
5. Feeder channel for diluting fluid according to claim 1, characterized in that by moving the shut-off/adjustment means the cross-sectional area of flow forming between the aperture (13) in the wall (4) and the shut-off/adjustment means (5) can be reduced or increased.
6. Feeder channel for diluting fluid according to claim 1, characterized in that the shut-off/adjustment means (5) is sleeve-shaped.
7. Feeder channel for diluting fluid according to claim 1, characterized in that the shut-off/adjustment means (5) is cylindrical, elliptical, polygonal or circular.
8. Feeder channel for diluting fluid according to claim 1, characterized in that the cavities and/or recesses (6, 14) in the shut-off/adjustment means (5) are formed in the shut-off/adjustment means such that they expand in the direction of the stock flow space (9), i.e. the cross-sectional area of them increases in the direction of the stock flow space.
9. Feeder channel for diluting fluid according to claim 1, characterized in that the cavities and/or recesses (6, 14) in the shut-off/adjustment means (5) comprise one or more straight and/or curved surfaces (6′, 14′).
10. Feeder channel for diluting fluid according to claim 1, characterized in that the cavities and/or recesses (6, 14) are concave in shape.
11. Feeder channel for diluting fluid according to claim 1, characterized in that the cavities and/or recesses (6, 14) are triangular or rectangular in shape.
12. Feeder channel for diluting fluid according to claim 1, characterized in that one or more cavity or recess (6, 14) are in connection with each other.
13. Feeder channel for diluting fluid according to claim 1, characterized in that the cavities or recesses (6, 14) are formed symmetrically in the shut-off/adjustment means (5).
14. Feeder channel for diluting fluid according to claim 1, characterized in that an intermediate piece (11), such as e.g. a hose, a line or a pipe, is fitted into the aperture (13), in the wall, for conducting the diluting fluid from the reservoir-type space into the stock flow space.
15. Feeder channel for diluting fluid according to claim 1, characterized in that an actuator (3) is connected to the shut-off/adjustment means with a connector part (16), for moving the shut-off/adjustment means (5).
16. Feeder channel for diluting fluid according to claim 15, characterized in that the connector part (16) is wholly or partially fitted inside the reservoir-type space (7).
17. Feeder channel for diluting fluid according to claim 1, characterized in that between the support surface and/or support surfaces (6″) of the shut-off/adjustment means and the inside surface (13′) of the aperture (13) in the wall (4) is a gap (18), which is preferably 0.05 mm-1 mm.
18. Feeder channel for diluting fluid according to claim 15, characterized in that with the actuator (3) a linear movement of the shut-off/adjustment means (5) in the longitudinal direction of the aperture (13) is achieved.
Type: Application
Filed: Mar 30, 2012
Publication Date: Oct 4, 2012
Applicant: VAAHTO OY (Hollola)
Inventors: Erkka NIEMINEN (Tampere), Harri KRONHOLM (Tampere)
Application Number: 13/434,987
International Classification: D21F 1/00 (20060101);