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.
The 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,
a and 1b present a side view of a feeder channel for diluting fluid according to the invention.
c presents a side view of a feeder channel for diluting fluid according to the invention when fitted to a headbox.
d presents an embodiment of a feeder channel for diluting fluid according to the invention, fitted to a headbox.
a-2d present an embodiment of a shut-off/adjustment means, with which the passage of diluting fluid is adjusted, in a feeder channel for diluting fluid according to the invention, and the figures also present the support of the shut-off/adjustment means on the edges of the aperture that is in the feeder channel.
a-9b present from different perspectives some possible shapes of a shut-off/adjustment means fitted into a feeder channel.
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
c presents a side view of a feeder channel for diluting fluid according to the invention when fitted to a headbox 10 and in the figure it is seen how the feeder channel 1 is connected to the headbox 10 such that it is placed on top of the stock flow space 9 of the headbox, wherein the flowing stock suspension is described with the reference number 15. In the situation presented by
d presents one embodiment of the invention, in which an intermediate piece 11, such as e.g. a hose, a line or a pipe, along which diluting fluid 12 is able to flow into the stock flow space, is fitted to the aperture 13 in the wall 4, for conducting the diluting fluid from the reservoir-type space 7 into the stock flow space 9. The intermediate piece 11 can be fixed to the aperture 13 and to the stock flow space 9 directly or indirectly, either in a fixed manner or detachably.
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
b presents only one shape of the shut-off/adjustment means, but it is not in any way limiting, but instead the shape of it can be of another type such as e.g. a cylinder, ellipse, polygon, et cetera. The shut-off/adjustment means can thus also be of uniform cross-section, i.e. it then has a uniform cross-sectional shape, i.e. its diameter/diameters remain(s) the same all the time, and at the same time in can rest on the sides of the aperture, the aperture having a similar uniform cross-sectional shape (e.g. a circle).
c presents a side view of a shut-off/adjustment means 5, and
From
Without being limited to the shapes presented by
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.
Number | Date | Country | Kind |
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20115312 | Mar 2011 | FI | national |