CA2614874C - Seal construction for a suction box in a suction roll in a paper/board machine - Google Patents
Seal construction for a suction box in a suction roll in a paper/board machine Download PDFInfo
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- CA2614874C CA2614874C CA002614874A CA2614874A CA2614874C CA 2614874 C CA2614874 C CA 2614874C CA 002614874 A CA002614874 A CA 002614874A CA 2614874 A CA2614874 A CA 2614874A CA 2614874 C CA2614874 C CA 2614874C
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Abstract
A seal for a suction box in a suction roll in a paper/board machine, comprising a wear fame (10b) structured and arranged to be affixed atop a base frame (10a), the base frame having a first cavity (D1) being structured and arranged to receive a locking means for said seal (10) therein. At least one groove (D2a, D2b) is formed in a second side of the base frame (10a) and is structured and arranged to receive at least one seal band therein, the second side being opposite to the first side of the base frame. A second cavity (D2) is formed on the second side of the base frame (10) having a top and a bottom face (e'l, e'2). A rib (16) is structured and arranged to cooperate with and abut against at least one of the seal bands on the second side of the base frame, wherein the top and bottom faces (e'1, e'2) are inclined in relation to a central axis (Y) of the seal (10). In this arrangement, all elements for locking the seal rib are planar in the seal rib itself.
Description
Seal construction for a suction box in a suction roll in a paper/board machine This application is a division of co-pending Canadian Patent Application no.
2,306,700, filed October 22, 1998.
The invention concerns a seal construction for a suction box in a suction roll in a paper machine.
Wear of seals in suction rolls has become a problem in an attempt to achieve longer servicing intervals. In a prior-art solution, in view of providing an efficient and tight suction roll, the seals are pressed by means of compressed air against the inner face of the roll mantle. In such a case, the compression force is maintained constantly, and the seal wears rapidly. In the present patent application, an efficient solution is suggested in order to avoid wear of the seal. According to the present invention, the seal rib is provided with a locking device. The seal is first pressed against the roll mantle. After generation of a vacuum in the suction box, the pressure is eliminated from the seal loading means, and the seal is locked in its holder. With the arrangement in accordance with the invention, even the water lubrication can be omitted.
Further, the seals can be provided with inclined faces, which permit gradual equalization of the pressures in the perforations in the suction roll as the perforations in the roll depart from the area of vacuum along with the rotation of the roll.
The prior art related to the present invention is represented by the applicant's earlier FI Patent Application No. 934909, in which the main principle of the invention on the whole is protected, i.e. carrying out a locking of the seal rib.
In the present new patent application, a precise, optimal solution is described for providing a locking construction. In the present invention, a locking construction is employed in which all the constructions for carrying out the locking are placed in the seal rib itself. Thus, no separate alterations have to be made in the seat.
In accordance with the present invention, as the device for locking of the seal, a separate loading device is employed, favourably a hose operating by means of air pressure. The hose has been fitted between the seal and the holder on the bottom of a groove provided in the seal. According to the invention, said hose is placed in connection with a separate piston part. At the opposite side of the seal, there is a separate rib, which is pressed against the wall of the holder. In connection with said rib, there are seal bands. The piston part and said separate rib are favourably made of reinforced plastic, such as fibreglass epoxy resin or fibreglass phenol resin or PE
plastics.
The seal 10 itself consists of two component frames: a base frame 10a and a wear frame lOb. On the top of the base frame 10a, there is a separate wear framelOb as the contact frame, which wear frame can be made of rubber graphite, carbon graphite, or plastics, such as PE, PC, PPF, PEEK, or PFTE plastic or phenol resin. The construction may further include fibre reinforcements, such as carbon fibres, glass fibres, aramide fibres, and it may also contain graphite powder. Said separate wear frame has been fixed to the base frame by gluing. The wear frame has also been attached to the base frame by means of a dovetail joint.
Accordingly, in one aspect of the present invention, there is provided a seal for a suction box in a suction roll in a paper/board machine, wherein the seal is a rib which comprises a wear frame which has been fixed to a base frame of the seal, and the base frame of the seal comprises at one side thereof a first cavity for a locking means of the seal.
The invention will be described in the following with reference to some preferred embodiments of the invention illustrated in the figures in the drawings, the invention being, however, not supposed to be confined to said embodiments alone.
Figure lA illustrates a suction roll in a paper machine by whose means water is removed out of the web.
Figure 1B shows a seal holder for prior-art operation of a seal together with a loading hose placed on the bottom of the seal holder.
The invention concerns a seal construction for a suction box in a suction roll in a paper machine.
Wear of seals in suction rolls has become a problem in an attempt to achieve longer servicing intervals. In a prior-art solution, in view of providing an efficient and tight suction roll, the seals are pressed by means of compressed air against the inner face of the roll mantle. In such a case, the compression force is maintained constantly, and the seal wears rapidly. In the present patent application, an efficient solution is suggested in order to avoid wear of the seal. According to the present invention, the seal rib is provided with a locking device. The seal is first pressed against the roll mantle. After generation of a vacuum in the suction box, the pressure is eliminated from the seal loading means, and the seal is locked in its holder. With the arrangement in accordance with the invention, even the water lubrication can be omitted.
Further, the seals can be provided with inclined faces, which permit gradual equalization of the pressures in the perforations in the suction roll as the perforations in the roll depart from the area of vacuum along with the rotation of the roll.
The prior art related to the present invention is represented by the applicant's earlier FI Patent Application No. 934909, in which the main principle of the invention on the whole is protected, i.e. carrying out a locking of the seal rib.
In the present new patent application, a precise, optimal solution is described for providing a locking construction. In the present invention, a locking construction is employed in which all the constructions for carrying out the locking are placed in the seal rib itself. Thus, no separate alterations have to be made in the seat.
In accordance with the present invention, as the device for locking of the seal, a separate loading device is employed, favourably a hose operating by means of air pressure. The hose has been fitted between the seal and the holder on the bottom of a groove provided in the seal. According to the invention, said hose is placed in connection with a separate piston part. At the opposite side of the seal, there is a separate rib, which is pressed against the wall of the holder. In connection with said rib, there are seal bands. The piston part and said separate rib are favourably made of reinforced plastic, such as fibreglass epoxy resin or fibreglass phenol resin or PE
plastics.
The seal 10 itself consists of two component frames: a base frame 10a and a wear frame lOb. On the top of the base frame 10a, there is a separate wear framelOb as the contact frame, which wear frame can be made of rubber graphite, carbon graphite, or plastics, such as PE, PC, PPF, PEEK, or PFTE plastic or phenol resin. The construction may further include fibre reinforcements, such as carbon fibres, glass fibres, aramide fibres, and it may also contain graphite powder. Said separate wear frame has been fixed to the base frame by gluing. The wear frame has also been attached to the base frame by means of a dovetail joint.
Accordingly, in one aspect of the present invention, there is provided a seal for a suction box in a suction roll in a paper/board machine, wherein the seal is a rib which comprises a wear frame which has been fixed to a base frame of the seal, and the base frame of the seal comprises at one side thereof a first cavity for a locking means of the seal.
The invention will be described in the following with reference to some preferred embodiments of the invention illustrated in the figures in the drawings, the invention being, however, not supposed to be confined to said embodiments alone.
Figure lA illustrates a suction roll in a paper machine by whose means water is removed out of the web.
Figure 1B shows a seal holder for prior-art operation of a seal together with a loading hose placed on the bottom of the seal holder.
Figure 1C is a sectional view taken along the line I-I in Fig. 1B.
Figure 2A shows a locking construction between a seal in accordance with the invention and the seal holder as a sectional view of the seal rib. In the embodiment shown in Fig. 2A, the seal has been pressed against the inner face of the roll.
Figure 2B shows a stage of locking in which the locking has been accomplished, in which case the top face 10' of the sea110 is preferably placed slightly apart from the roll mantle. The gap is, however, so little that no significant leakage occurs. In such a case, the wear of the seal has been minimized, while the sealing effect of the seal has, however, been maximized.
Figure 3 shows an embodiment of the invention in which there are two loading hoses between the bottom of the holder and the seal.
Figure 4A shows an embodiment of the seal constniction in accordance with the invention in which there is a loading hose at each side of the seal.
Figure 4B shows the operation of the seal construction as shown in Fig. 4A in the stage in which the gap J has been formed between the seal and the inner face of the roll mantle after locking of the seal carried out by means of the loading hoses placed at both sides of the seal.
Fig. 1A shows a prior-art operation of a suction roll in a paper machine. The web R is passed through the nip Nl between the rolls Tl and T2 along the face of the roll T2 into the nip N2 between the rolls T2 and T3. In the interior of the roll T2, there are a vacuum chamber Al and a vacuum chamber A2. The vacuum chamber Al is placed between the seals C 1 and C2, and the vacuum chamber A2 between the seals C2 and C3. Thus, water is sucked out of the web R into the vacuum chambers Al, A2 by a suction box B. In said prior-art operation, the seals Cl; CZ and C3 are pressed constantly against the inside face T2' of the roll T2 mantle with a force produced by loading hoses.
Figure 2A shows a locking construction between a seal in accordance with the invention and the seal holder as a sectional view of the seal rib. In the embodiment shown in Fig. 2A, the seal has been pressed against the inner face of the roll.
Figure 2B shows a stage of locking in which the locking has been accomplished, in which case the top face 10' of the sea110 is preferably placed slightly apart from the roll mantle. The gap is, however, so little that no significant leakage occurs. In such a case, the wear of the seal has been minimized, while the sealing effect of the seal has, however, been maximized.
Figure 3 shows an embodiment of the invention in which there are two loading hoses between the bottom of the holder and the seal.
Figure 4A shows an embodiment of the seal constniction in accordance with the invention in which there is a loading hose at each side of the seal.
Figure 4B shows the operation of the seal construction as shown in Fig. 4A in the stage in which the gap J has been formed between the seal and the inner face of the roll mantle after locking of the seal carried out by means of the loading hoses placed at both sides of the seal.
Fig. 1A shows a prior-art operation of a suction roll in a paper machine. The web R is passed through the nip Nl between the rolls Tl and T2 along the face of the roll T2 into the nip N2 between the rolls T2 and T3. In the interior of the roll T2, there are a vacuum chamber Al and a vacuum chamber A2. The vacuum chamber Al is placed between the seals C 1 and C2, and the vacuum chamber A2 between the seals C2 and C3. Thus, water is sucked out of the web R into the vacuum chambers Al, A2 by a suction box B. In said prior-art operation, the seals Cl; CZ and C3 are pressed constantly against the inside face T2' of the roll T2 mantle with a force produced by loading hoses.
Fig. 1B illustrates the prior-art holder construction 11 for the seals C1, C2, shown in Fig. 1A.. The seal (not shown in the figure) is pressed with a force, by means of the air pressure produced in the loading hose 12, against the inner face T2' of the roll mantle of the roll T,.
Fig. IC is a sectional view taken along the line I-I in Fig. 1B.
In the prior-art solutions illustraied in Figs. 1A...1C, the seals C1, C2 and C3 are pressed constantly with a force against the inner face of the roll mantle of the revolving roll. The seals Ci, C,) and C3 wear rapidly even if they were lubricated with water during the operation of the roll.
Fig. 2A shows the seal construction in accordance with the invention in a stage in which the pressing and locking of the seal 10 against the inner face 11' of the holder 11 has not yet been carried out bv means of the locking devices. Based on Fib.
2A, the seal construction in accordance with the invention will be described. As is shown in Fig. 2A, the seal construction comprises a seal 10 in the seal groove U in a holder 11. In the embodiment shown in Fig. 2A, the seal 10.comprises a base f=rame l0a and a wear frame lOb. As is shown in the figure, the wear frame lOb has been fixed to the base frame l0a by gluing and by means of a dovetail joint f. The seal 10 is an oblong rib-like part, which extends substantially over the entire length of the roll. The base frame l0a comprises oblong cavities or spaces D 1 and D2 in both of its side faces. In the figure, into the right-side cavity or space D1, a loading member 13, preferably a loading hose, has been fitted, which can be loaded by means of air pressure, which pressure can be passed into the loading hose. The loading hose has been fitted in connection with the space D 1 so that the loading hose 13 rests against the end wall D 1' of the space D 1, on one hand, and against a displaceable piston part 14, on the other hand. During loading of the hose, the piston part 14 can be pressed against the wall 11' of the holder 11. The piston 14 has been fitted in the space D, with glide fitting, i.e. it can be made to glide in relation to the side walls, i.e. the top and bottom face el,e,), of the space. When the seal 10 is locked in relation to the seat 11. the holder 11 is first pressed with the force, produced by the loading hose 12 placed between the seal 10 and the bottom 11" of the' holder 11, against the inner face T' of the roll mantle. When the desired vacuum level has been reached, the loading pressure is removed from the hose 12. After this, locking is performed by means of the loading device 13, preferably a loading hose, by shifting the seal 101aterally against the wall 11' of the holder 11. Said shifting is carried out by the loading hose 13 so that it shifts the piston part 14 against one vertical wall 11' of the holder 11. Thus, the seal 10 is locked between two vertical walls of the holder 11 while the piston part is pressed aaainst one wall of the holder 11 and while the side seal placed at the other side is pressed with the force produced by the loading hose 13 against the other vertical wall 11' of the holder 11.
As is shown in the figure, at the other side of the base frame 11a of the seal 11 there is a cavity D,, which consists of two parts and comprises the spaces D,?a,DZb.
In each of said cavity portions D,a and D2b there is a resilient element, which is preferably an oblong seal band 15a1,15ai. Against each of said seal bands 15at,15a2, a separate rib 16 is supported, which is placed in the area of the cavities D2a and D2b and one of whose sides rests against the seal bands 15a1,15aj, whereas the other plane side rests against the inner face 11' of the vertical wall of the holder 11. Thus, the rib 16 can be shifted by means of a glide fitting inrelation to the side walls, i.e. the top and bottom face el' and e2', of the cavity D2.
On the bottom of the cavity U 1, there is a loading device 12, favourably a loading hose, which can be loaded by means of pressure produced in its interior, preferably air pressure. In such a case, the shape of the loading hose 12 can be varied, and the face lOb' of the wear frame lOb of the seal 10 can be displaced with force against the. inner face T' of the roll T mantle:
As is shown in Fig. 2A, the top and bottom faces el,e2,e1',e2' of both of the cavities D, and D2 are inclined in the same direction in relation to the central and vertical axis Y of the seal 10. When the locking is carried out, the seal 10 is shifted in the lateral direction. When the seal 10 is locked, first the seal 10 is pressed by means of the loading hose 12 placed on the bottom of the =roove U 1 in the holder 11 against the inner face T' of the roll mantle. When the desired vacuttm level has been reached, the pressure is removed from the loading hose 12 / loading hoses 12a1,12a2. After this, the loading device 13, preferably a loading hose, is employed, and by its means the piston part 14 is pressed into contact with the wall 11' of the holder 11, and the seal 10 is locked in relation to the holder 11, in which connection the seal 10 is kept in its place in relation to the holder 11 by means of the pressure produced in the loading hose 13. Thus, the seal 10 remains precisely locked in a certain position. The top and bottom faces el,e2;e1',e2' of the cavities D1 and D2 are in such a way inclined in relation to the central axis Y that in the cavity D 1 the top and bottom faces e l and e2 rise towards the roll T when moving from the end of the cavity D1 to the mouth of the cavity, and in the cavity D2 the top and bottom faces el',e2' are lowered in relation to the roll T when moving from the bottom of the cavity D, to its mouth. Thus, when the piston part 14 is displaced, the seal 10 is guided by means of said top and bottom faces el,e2;el',e2' so that its front face lOb' is guided apart from the inner face T' of the roll mantle.
Thus, when a loading hose 13 is used for locking, the gap J shown in Fig. 2B
can be produced between the front face lOb' of the wear frame lOb of the seal 10 and the inner face T' of the roll T mantle.
In the following, the optimal materials will be stated for a seal 10 in accordance with the present invention:
The material of the wear frame lOb of the seal 10 can be favourably as follows:
rubber graphite, carbon graphite, or, for example, the following plastics: PE
or PU
or PPS or PEEK or PTFE or phenol resin. It is also possible to use fibre reinforce-ments, such as carbon fibre or glass fibre or aramide fibre, and, as an additive, lubricating graphite powder or PTFE or molybdenum sulphide.
The material of the base frame part l0a of the side seal 10 and of the piston 14 is favourably:
- reinforced plastics: fibreglass epoxy resin or fibreglass phenol resin or PE
plastics.
Fig. 3 shows a second embodiment of the invention, which differs from the embodi-ment shown in Figs. 2A and 2B in the respect only that there are two loading hoses 12 that press the seal 10 towards the roll, i.e. 12a1 and 12a2. Further, the base frame l0a of the seal 10 comprises an oblong lower groove U), in which case the central shoulder 0 of the holder 11. which extends upwards, operates as a guide shoulder in order to guide the seal 10 towards the roll mantle T when the loading hoses 12a1,12a,) are operated.
Figs. 4A and 4B show an embodiment of the invention in which the seal bands 15a1 and 15a2 have been substituted for by a resilient loading hose 130. Fig. 4A
shows an embodiment in which the seal has been pressed against the inner face of the perforated roll mantle, and Fig. 4B shows a stage in which the gap J has been formed between the seal 10 and the inner face T' of the roll mantle T. The loading hose 130 is placed in a cavity D-, in one side face of the seal, and the loading hose 13 is placed in a cavity D 1 in the other side face of the seal. In the cavity D2 there is a rib 16. The rib can be displaced with a glide fitting in relation to the wall of the cavity D2. Similarly, the rib 14 can be displaced with a glide fitting in relation to the wall of the cavity D1. In the embodiment shown in Figs. 4A and 4B, the function of the loading hoses 13,130 is to operate, besides as loading elements, also as springs which permit relative movements between the rib 16 and the seal 10 and between the rib 14 and the seal 10 during locking. The top and bottom faces e l,e2;e 1',e2' of the cavities D 1 and D2 are inclined in the same way as, for example, in the embodiment shown in Fig. 2A. By means of the resilient elements, i.e. the hoses 13,130 in the embodiment shown in Figs. 4A and 4B, the locking force produced by means of said elements is transferred to the ribs 16 and 14. Thus, a friction force arises between the ribs 16 and 14 and the holder 11. When a gap J is supposed to be formed between the seal 10 and the inner face T' of the roll mantle T, the friction force between said lockina means and the holder must be higher than the vacuum force at the top face of the seal. Formation of said gap J, however, requires that the seal 10 moves, when pushed by the locking member 13, in relation to the rib 16 and 14 also after a sufficient friction force has been reached between the lockinQ means and the holder 11. Said movement is permitted by the elastic compression of the seal elements, for example the seal bands 15a,,15a2 or the loading hose 130, which compression has been produced by the locking force. If there were no such elastic elements 15a 1,15a2,130, a locking force would not be produced until when the ribs 16 contact the bottom of the related cavity, after which no more relative movement would take place between the seal and the locking means, in which case no gap J
would be produced either between the seal 10 and the inner face T' of the roll mantle T. Preferably, the cross-sectional area of the loading hose 13 is larger than that of the loading hose 130. The force is applied to the seal 10 so that it is pressed towards one side 11' of the holder, i.e. to the left as shown in Fig. 4B.
Fig. IC is a sectional view taken along the line I-I in Fig. 1B.
In the prior-art solutions illustraied in Figs. 1A...1C, the seals C1, C2 and C3 are pressed constantly with a force against the inner face of the roll mantle of the revolving roll. The seals Ci, C,) and C3 wear rapidly even if they were lubricated with water during the operation of the roll.
Fig. 2A shows the seal construction in accordance with the invention in a stage in which the pressing and locking of the seal 10 against the inner face 11' of the holder 11 has not yet been carried out bv means of the locking devices. Based on Fib.
2A, the seal construction in accordance with the invention will be described. As is shown in Fig. 2A, the seal construction comprises a seal 10 in the seal groove U in a holder 11. In the embodiment shown in Fig. 2A, the seal 10.comprises a base f=rame l0a and a wear frame lOb. As is shown in the figure, the wear frame lOb has been fixed to the base frame l0a by gluing and by means of a dovetail joint f. The seal 10 is an oblong rib-like part, which extends substantially over the entire length of the roll. The base frame l0a comprises oblong cavities or spaces D 1 and D2 in both of its side faces. In the figure, into the right-side cavity or space D1, a loading member 13, preferably a loading hose, has been fitted, which can be loaded by means of air pressure, which pressure can be passed into the loading hose. The loading hose has been fitted in connection with the space D 1 so that the loading hose 13 rests against the end wall D 1' of the space D 1, on one hand, and against a displaceable piston part 14, on the other hand. During loading of the hose, the piston part 14 can be pressed against the wall 11' of the holder 11. The piston 14 has been fitted in the space D, with glide fitting, i.e. it can be made to glide in relation to the side walls, i.e. the top and bottom face el,e,), of the space. When the seal 10 is locked in relation to the seat 11. the holder 11 is first pressed with the force, produced by the loading hose 12 placed between the seal 10 and the bottom 11" of the' holder 11, against the inner face T' of the roll mantle. When the desired vacuum level has been reached, the loading pressure is removed from the hose 12. After this, locking is performed by means of the loading device 13, preferably a loading hose, by shifting the seal 101aterally against the wall 11' of the holder 11. Said shifting is carried out by the loading hose 13 so that it shifts the piston part 14 against one vertical wall 11' of the holder 11. Thus, the seal 10 is locked between two vertical walls of the holder 11 while the piston part is pressed aaainst one wall of the holder 11 and while the side seal placed at the other side is pressed with the force produced by the loading hose 13 against the other vertical wall 11' of the holder 11.
As is shown in the figure, at the other side of the base frame 11a of the seal 11 there is a cavity D,, which consists of two parts and comprises the spaces D,?a,DZb.
In each of said cavity portions D,a and D2b there is a resilient element, which is preferably an oblong seal band 15a1,15ai. Against each of said seal bands 15at,15a2, a separate rib 16 is supported, which is placed in the area of the cavities D2a and D2b and one of whose sides rests against the seal bands 15a1,15aj, whereas the other plane side rests against the inner face 11' of the vertical wall of the holder 11. Thus, the rib 16 can be shifted by means of a glide fitting inrelation to the side walls, i.e. the top and bottom face el' and e2', of the cavity D2.
On the bottom of the cavity U 1, there is a loading device 12, favourably a loading hose, which can be loaded by means of pressure produced in its interior, preferably air pressure. In such a case, the shape of the loading hose 12 can be varied, and the face lOb' of the wear frame lOb of the seal 10 can be displaced with force against the. inner face T' of the roll T mantle:
As is shown in Fig. 2A, the top and bottom faces el,e2,e1',e2' of both of the cavities D, and D2 are inclined in the same direction in relation to the central and vertical axis Y of the seal 10. When the locking is carried out, the seal 10 is shifted in the lateral direction. When the seal 10 is locked, first the seal 10 is pressed by means of the loading hose 12 placed on the bottom of the =roove U 1 in the holder 11 against the inner face T' of the roll mantle. When the desired vacuttm level has been reached, the pressure is removed from the loading hose 12 / loading hoses 12a1,12a2. After this, the loading device 13, preferably a loading hose, is employed, and by its means the piston part 14 is pressed into contact with the wall 11' of the holder 11, and the seal 10 is locked in relation to the holder 11, in which connection the seal 10 is kept in its place in relation to the holder 11 by means of the pressure produced in the loading hose 13. Thus, the seal 10 remains precisely locked in a certain position. The top and bottom faces el,e2;e1',e2' of the cavities D1 and D2 are in such a way inclined in relation to the central axis Y that in the cavity D 1 the top and bottom faces e l and e2 rise towards the roll T when moving from the end of the cavity D1 to the mouth of the cavity, and in the cavity D2 the top and bottom faces el',e2' are lowered in relation to the roll T when moving from the bottom of the cavity D, to its mouth. Thus, when the piston part 14 is displaced, the seal 10 is guided by means of said top and bottom faces el,e2;el',e2' so that its front face lOb' is guided apart from the inner face T' of the roll mantle.
Thus, when a loading hose 13 is used for locking, the gap J shown in Fig. 2B
can be produced between the front face lOb' of the wear frame lOb of the seal 10 and the inner face T' of the roll T mantle.
In the following, the optimal materials will be stated for a seal 10 in accordance with the present invention:
The material of the wear frame lOb of the seal 10 can be favourably as follows:
rubber graphite, carbon graphite, or, for example, the following plastics: PE
or PU
or PPS or PEEK or PTFE or phenol resin. It is also possible to use fibre reinforce-ments, such as carbon fibre or glass fibre or aramide fibre, and, as an additive, lubricating graphite powder or PTFE or molybdenum sulphide.
The material of the base frame part l0a of the side seal 10 and of the piston 14 is favourably:
- reinforced plastics: fibreglass epoxy resin or fibreglass phenol resin or PE
plastics.
Fig. 3 shows a second embodiment of the invention, which differs from the embodi-ment shown in Figs. 2A and 2B in the respect only that there are two loading hoses 12 that press the seal 10 towards the roll, i.e. 12a1 and 12a2. Further, the base frame l0a of the seal 10 comprises an oblong lower groove U), in which case the central shoulder 0 of the holder 11. which extends upwards, operates as a guide shoulder in order to guide the seal 10 towards the roll mantle T when the loading hoses 12a1,12a,) are operated.
Figs. 4A and 4B show an embodiment of the invention in which the seal bands 15a1 and 15a2 have been substituted for by a resilient loading hose 130. Fig. 4A
shows an embodiment in which the seal has been pressed against the inner face of the perforated roll mantle, and Fig. 4B shows a stage in which the gap J has been formed between the seal 10 and the inner face T' of the roll mantle T. The loading hose 130 is placed in a cavity D-, in one side face of the seal, and the loading hose 13 is placed in a cavity D 1 in the other side face of the seal. In the cavity D2 there is a rib 16. The rib can be displaced with a glide fitting in relation to the wall of the cavity D2. Similarly, the rib 14 can be displaced with a glide fitting in relation to the wall of the cavity D1. In the embodiment shown in Figs. 4A and 4B, the function of the loading hoses 13,130 is to operate, besides as loading elements, also as springs which permit relative movements between the rib 16 and the seal 10 and between the rib 14 and the seal 10 during locking. The top and bottom faces e l,e2;e 1',e2' of the cavities D 1 and D2 are inclined in the same way as, for example, in the embodiment shown in Fig. 2A. By means of the resilient elements, i.e. the hoses 13,130 in the embodiment shown in Figs. 4A and 4B, the locking force produced by means of said elements is transferred to the ribs 16 and 14. Thus, a friction force arises between the ribs 16 and 14 and the holder 11. When a gap J is supposed to be formed between the seal 10 and the inner face T' of the roll mantle T, the friction force between said lockina means and the holder must be higher than the vacuum force at the top face of the seal. Formation of said gap J, however, requires that the seal 10 moves, when pushed by the locking member 13, in relation to the rib 16 and 14 also after a sufficient friction force has been reached between the lockinQ means and the holder 11. Said movement is permitted by the elastic compression of the seal elements, for example the seal bands 15a,,15a2 or the loading hose 130, which compression has been produced by the locking force. If there were no such elastic elements 15a 1,15a2,130, a locking force would not be produced until when the ribs 16 contact the bottom of the related cavity, after which no more relative movement would take place between the seal and the locking means, in which case no gap J
would be produced either between the seal 10 and the inner face T' of the roll mantle T. Preferably, the cross-sectional area of the loading hose 13 is larger than that of the loading hose 130. The force is applied to the seal 10 so that it is pressed towards one side 11' of the holder, i.e. to the left as shown in Fig. 4B.
Claims (3)
1. A seal for a suction box in a suction roll in a paper/board machine, comprising:
a wear fame structured and arranged to be affixed to a base frame, said base frame having a first cavity formed in a first side thereof, said first cavity being structured and arranged to receive a locking means for said seal therein;
at least one groove being formed in a second side of said base frame, said at least one groove being structured and arranged to receive at least one seal band therein, wherein said second side being opposite said first side of said base frame;
a second cavity formed on said second side of said base frame having a top and a bottom face;
a rib structured and arranged to cooperate with and abut against at least one of said seal bands on said second side of said base frame and to be guided between said top and bottom faces, wherein said top and bottom faces are inclined in relation to a central axis of said seal.
a wear fame structured and arranged to be affixed to a base frame, said base frame having a first cavity formed in a first side thereof, said first cavity being structured and arranged to receive a locking means for said seal therein;
at least one groove being formed in a second side of said base frame, said at least one groove being structured and arranged to receive at least one seal band therein, wherein said second side being opposite said first side of said base frame;
a second cavity formed on said second side of said base frame having a top and a bottom face;
a rib structured and arranged to cooperate with and abut against at least one of said seal bands on said second side of said base frame and to be guided between said top and bottom faces, wherein said top and bottom faces are inclined in relation to a central axis of said seal.
2. A seal as claimed in claim 1, wherein said wear frame of said seal is affixed to said base frame of said seal by means of at least one of a dove tail joint and/or by means of an adhesive.
3. A seal as claimed in claim 1 or 2, further comprising:
a groove formed in a bottom surface of said base frame of said seal.
a groove formed in a bottom surface of said base frame of said seal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI974023A FI107171B (en) | 1997-10-22 | 1997-10-22 | Paper machine / board machine suction roll suction box sealing structure |
| FI974023 | 1997-10-22 | ||
| CA002306700A CA2306700C (en) | 1997-10-22 | 1998-10-22 | Seal construction for a suction box in a suction roll in a paper/board machine |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002306700A Division CA2306700C (en) | 1997-10-22 | 1998-10-22 | Seal construction for a suction box in a suction roll in a paper/board machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2614874A1 CA2614874A1 (en) | 1999-04-29 |
| CA2614874C true CA2614874C (en) | 2009-12-15 |
Family
ID=39315310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002614874A Expired - Lifetime CA2614874C (en) | 1997-10-22 | 1998-10-22 | Seal construction for a suction box in a suction roll in a paper/board machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2614874C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108442164A (en) * | 2018-05-23 | 2018-08-24 | 无锡鸿华造纸机械有限公司 | A kind of paper grade (stock) suction press roll |
-
1998
- 1998-10-22 CA CA002614874A patent/CA2614874C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2614874A1 (en) | 1999-04-29 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20181022 |