• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A device (10) is provided for preventing rewetting in a pulp washer (100), with two press rolls (2), arranged to rotate in opposite directions and having permeable outer surfaces (4), inside of which filtrate channels (6) are arranged. The device (10) comprises an anti-rewet beam (12), the cross-section of which forms a closed shape. The anti-rewet beam in turn comprises a filtrate barrier (12a) positioned towards the outer wall (6a) of the filtrate channel to prevent flow of liquid from the trailing part of the filtrate channel to the outer surface of the press roll, a support member (12b) positioned towards the rear side wall (6d) of the filtrate channel, and at least one intermediate beam portion (12c, 12c'), interconnecting the filtrate barrier and the support member, to form the closed beam shape.
    公开号:SE1150946A1
    申请号:SE1150946
    申请日:2011-10-12
    公开日:2013-04-13
    发明作者:Joergen Lundberg；Hans Loevgren
    申请人:Metso Paper Sweden Ab；
    IPC主号:
    专利说明:

    WO 2010/101 518 A1 shows an anti-wetting insert with an filtrate barrier which is clamped against the outer wall of the filtrate channel with clamping screws. Several springs are pivotally connected to the filtrate banner to support it. WO 2010/138059 proposes a mechanism which uses a biasing member to obtain a compressed state and an extended state, respectively, which facilitates the removal of the anti-rewetting insert from the atltrate channel for e.g. cleaning.
    WO 2010/138056 discloses a mechanism of the latter type provided with a locking means for preventing axial displacement.
    Previous anti-return devices have rather complex designs, which include a number of different mechanical components that act together. This makes them comparatively difficult to manufacture and handle. For example, spring-dependent devices for holding a plate against the perforated roller require a large number of springs to function properly, and springs are difficult components because they need to be able to withstand the harsh environment of the filtrate channel. and still show good spring properties.
    The anti-wetting unit often becomes a little loose or unstable.
    Consequently, there is a need for an improved anti-wetting device.
    SUMMARY An object of the invention is to provide an improved unit for preventing rewetting in a cellulose pulp roller press. This object is achieved according to the appended claims.
    The invention provides a new anti-wetting unit comprising an anti-wetting beam, the filtrate banner forming a closed shape together with a support part, which slopes against one of the side walls of the filtrate channel, and one or two intermediate beam pieces connecting the filtrate barrier and the supporting part. (The term "beam" here refers to an axially extending structure or part). The anti-wetting unit of the invention has a design that is comparatively simple and straightforward, which facilitates the manufacture, installation and handling of the unit when the unit is installed in a roller press. The closed shape makes it possible to attach the anti-rewetting beam only to the ends, which is a significant advantage. The anti-wetting beam is preferably substantially self-supporting, in that the filtrate barrier is supported in its position against the outer wall of the filtrate channel by the support part and the intermediate beam piece (s).
    More specifically, a unit is provided for preventing rewetting of pulp in an apparatus for washing and / or dewatering cellulosic pulp, which apparatus comprises two press rolls, arranged to rotate in opposite directions during operation, at least one of the press rolls having a permeable outer surface , inside which permeable outer surface a number of axially extending filtrate channels are arranged, each filtrate channel having an outer wall, an inner wall, a front wall and a back wall, whereby mass which is fed into the apparatus during operation is transported on the permeable outer surface in the direction of rotation and pressed in a nip. between the press rollers. The rewetting prevention unit is adapted to be installed in one of the filtrate channels and comprises an axially extending anti-wetting beam, the cross-section of which at least at portions of the anti-wetting beam forms a closed shape. The anti-wetting beam in turn includes an axially extending filtrate barrier adapted to be located against the outer wall of the filtrate channel to prevent liquid from flowing from the rear of the filtrate channel to the outer surface of the press roll, an axially extending support side adapted to be tr The filtrate barrier with the support part, to form the closed beam shape.
    According to an advantageous embodiment, the anti-rehydration beam is made so that fl uid (trltrate) can fl desolate inside it, Lex. provided with openings. This means that a relatively high filtrate flow out of the filtrate channel can be maintained, thereby reducing the risk of re-wetting of the filtrate above the anti-rehydration beam.
    According to another aspect of the invention, there is provided a roller press for washing and / or dewatering cellulosic pulp, which comprises the unit for preventing recovery. BRIEF DESCRIPTION OF THE DRAWINGS The invention, together with its further objects and advantages, can best be understood by reference to the following description and accompanying drawings, in which: Fig. 1 is a schematic cross-sectional view showing a washing / dewatering apparatus with a unit for preventing rewetting according to an exemplary embodiment of the invention; Fig. 2 is a schematic cross-sectional view showing a unit for preventing rewetting according to an exemplary embodiment of the invention, the unit being in a first radial position P1; Fig. 3 is a schematic cross-sectional view showing a unit for preventing dehydration according to an example of the embodiment of the invention, where the unit is in a second radial position P2; Figs. 4A and 4B are schematic longitudinal views showing an anti-rewetting beam with openings according to examples of embodiments of the invention; F ig. 5 is a schematic cross-sectional view showing a unit for preventing rewetting according to other examples of desiccants of the invention; and Figs. 6A and 6B are schematic longitudinal views showing a level sinker beam with apertures according to exemplary embodiments of the invention.
    DETAILED DESCRIPTION In the ur gures, identical or corresponding elements are marked with the same reference number.
    Fig. 1 shows an example of an apparatus 100 for washing and / or dewatering cellulose pulp with an example of a unit 10 for preventing rewetting according to 100 press rolls / drums. The press rollers 2 are arranged to rotate in opposite directions R, the invention. A twin roll press which comprises two cooperating R 'during operation and each has a permeable outer surface 4, such as a perforated metal plate.
    The press rollers 2 are partially enclosed by a trough 5 formed by guide surfaces, arranged at a distance from the permeable outer surfaces 4 to partially enclose the press rollers 2 in the circumferential direction.
    During operation, the pulp is fed into a pulp distribution unit 1 of the respective press roll 2.
    The inlet consistency of the pulp is typically in the range of 243%. A pulp web is formed on the permeable roll surface 4. The pulp web is transported, guided by the trough 5, in the direction of rotation R, R ”to be pressed in a nip 3, where the distance between the press rolls 2 is least.
    The press rollers 2 comprise axial filtrate channels 6, which receive the filtrate passing through the permeable roll surface 4, and typically transport it towards the ends 2 of the press roll, where it is discharged. Washing liquid can be supplied to the pulp web in the trough 5. The pulp is discharged by means of a drain screw 7.
    In Fig. 1, two press rollers 2, each provided with a re-wetting unit 10, are arranged next to each other, with their centers of rotation in the same horizontal plane.
    The invention is also suitable for washing / dewatering appliances where e.g. the rollers are arranged differently or only a perforated roller is used.
    In the simplified view in Fig. 1, there is only one unit 10 for preventing rewetting for each press roll 2. Typically, there will be units 10 for preventing rewetting installed in each filtrate channel 6 of the respective press roll 2, or at least in a large subgroup of the atltrate channels 6.
    The rewetting prevention unit 10 can be used as an upgrade of an existing press roll 2, or, alternatively, it can be built into the press roll 2 already during manufacture. The example of rewetting prevention unit 10 will now be described with reference to Figs. 2, which shows the unit 10 installed in a filtrate channel 6 in three modes (Mode P1). An annular space inside the permeable roll surface 4 is divided into axially extending (i.e. longitudinal) filtrate channels 6 with side walls 6c, 6d. Each filtrate channel has an outer wall 6a, an inner wall 6b, a front wall 6c and a back wall 6d. The outer wall 6a is permeable, typically it is part of the permeable outer surface 4 of the press roll 2. It should be noted that the terms "front and back walls" here refer to a specific filtrate channel. Thus, one and the same side wall is the back wall 6d of the filtrate channel 6 above it and the front wall 6c of the filtrate channel 6 below it, when the filtrate channel rotates upwards as in Fig. 2.
    The rewetting prevention unit 10 comprises an axially extending anti-rewetting beam 12, which consists of a filtrate barrier 12a, placed against the outer wall 6a of the filtrate channel 6 to prevent liquid from the rear portion 2 of the filtrate channel intermediate beam pieces 120, 12c °, which connect the filtrate barrier 12a to the support part 12b.
    In other words, the filtrate barrier 12a is adapted to support or lean against the outer wall 6a of the filtrate channel 6 when the rewetting prevention unit 10 is in operation (position P1 in Fig. 2) to prevent liquid leakage from the rear of the filtrate channel 6 to the outside of the press roll 2. . The support part 12b is adapted to support or lean against the back wall 6d of the kanltrate channel 6.
    The intermediate beam pieces l2c, 12c ° connect the atltrate barrier l2a with the support part l2b to form a substantially closed shape in cross section. "Closed shape" means that the cross-section of the anti-wetting beam is hollow, not solid. It defines a substantially closed area as seen in the cross-sectional view of Fig. 2. "Cross section" here refers to the section formed by a plane which intersects the anti-wetting beam 12 at an angle to its longitudinal axis.
    It is to be understood that the anti-wetting beam 12 need not form a closed shape around its circumference along its entire length. For example, it may be holes, slits or the like that interrupt the closed mold. However, the anti-rewetting beam should always form a closed shape, at least at portions of the length of the anti-rewetting beam 12. Advantageously, the cross section of the anti-rewetting beam 12 forms a closed shape along most of the length of the anti-rewetting beam 12, i.e. the total length of the portions of the anti-rewetting beam 12 forming a closed shape is more than half the length of the anti-rewetting beam 12.
    I F ig. 2, it is an intermediate beam piece l2c which connects the front end of the atltrate barrier l2a and the inner end of the support part 12b, and an intermediate beam piece l2c ”which connects the rear end of the atlatrate barrier l2a and the outer end of the support part 12b. (The terms "front" and "rear" here refer to the direction of rotation R. "Inner" and "outer" refer to a cross-sectional view of the press roll 2, where "inner" is closer to the axis of rotation of the press roll 2.) Still referring to Fig. 2, the anti-dewatering beam 12 is advantageously substantially self-supporting, and the filtrate barrier is supported in its position against the outer wall 6a of the filtrate channel 6 by the support part 12b and the intermediate beam pieces 12c, 12c '.
    The anti-wetting beam 12 may advantageously consist of a sheet metal frame. The metal plate should be chosen so that a comparatively rigid and rigid beam structure is obtained.
    According to an advantageous desiccation form, the filtrate barrier 12a of the anti-wetting beam 12 extends to at least one third of the height of the outer wall 6a of the filtrate channel 6.
    According to another advantageous embodiment, the cross-section of the anti-wetting beam 12 encloses an area which covers at least one-fifth of the inner cross-sectional area of the filtrate channel 6.
    As shown in Figs. 2 and 3, the dehydration prevention unit 10 preferably comprises means 14 for attaching the end portions of the support member 12b to the back wall 6d of the filtrate channel 6. The term "end portions" refers to the support member portions 12b at or near the respective ends of the press roll 2 seen in the longitudinal (axial) direction. The structure of the anti-wetting beam 12 of the invention with its closed shape makes it possible to attach it only to the ends, which is a significant advantage when it comes to installation and handling of the anti-wetting unit 10. For very long press rolls 2, it can be 10 15 20 25 30 it is appropriate to arrange a support also between the end portions, e.g. at the center of the support member l2b to prevent deflection.
    The fastener 14 may be adapted for radial movement of the anti-wetting beam 12 between a first position P1, where the filtrate barrier 12a abuts the outer wall 6a (Fig. 2) of the filtrate channel 6, and a second position P2, where the filtrate barrier 12a is at a distance from the outer wall 6a (Figs. 3) to enable cleaning of the permeable outer surface 4 of the press roll 2 with the unit 10 for preventing rewetting still in the filtrate channel 6. E.g. For example, a bolt (or screw) and nut fastening can be used, which locks the support part 12b in positions P1 and P2 through holes or slots in the back wall 6d. In an advantageous embodiment, the fastening means 14 are arranged so that the anti-wetting beam 12 can slide radially to and from the outer side wall 6a by loosening the bolt and nut fastening. It is a significant advantage that cleaning of the press roll 2 can be performed without removing the anti-wetting unit 10 from the filtrate channel 6.
    The cleaning requires relatively few and simple steps and is faster than with conventional anti-rewetting solutions.
    F conductive anti-rehydration beam.
    A common problem with inserting an anti-rehydration unit into the filtrate channel is that the filtrate flow out of the filtrate channel is reduced. If the filtrate level is above the anti-rehydration beam, it can still re-wet the pulp outside the filtrate channel to some extent. Therefore, the anti-rewetting beam 12 is preferably made so that fl uid (filtrate) can fl blister inside it and it typically has open ends, for discharging filtrate. It can advantageously be provided with openings, e.g. as shown in Fig. 4A and 4B (views corresponding to A- A in Fig. 2). In these examples, the intermediate beam piece 12c connecting the front portion of the intrinsic barrier 12a and the inner portion of the support member 12b are provided with openings 16, 16 "so that the filtrate can be blown inside the anti-wetting beam 12. The openings 16, 16" are Lex. be openings, holes, orifices, cracks and / or perforations. The openings 16, 16 ”result in an improved filtrate flow out of the filtrate channel 6. Only a small part of the cross-sectional area in the filtrate channel 6 from which re-wetting is not a problem is lost, i.e. occupied by the anti-rewetting beam 12.
    See also the anti-wetting beam 12 with dots in Fig. 5, which shows fl uid (filrated) inside the beam. According to some advantageous embodiments, the openings 16, 16 "are concentrated in one or more of the areas of the intermediate beam piece 12c, in order to control the fate through the intermediate beam piece 12c and to achieve a desired pattern of fate through the anti-rewetting beam 12. This means that there are openings. 16, 16 ”in this area and that the openings are unevenly distributed over the anti-rewetting beam 12.
    It has been noted that, in the filtrate channel 6, the filtrate level drops significantly faster closer to the ends than in the middle (seen in the longitudinal, i.e. axial direction). The filtrate level in the middle of the filtrate channel 6 drops slowly and there is a risk of re-wetting due to tr filtrate rising above the anti-rewetting beam 12. To reduce or minimize this problem, the openings 16 may be mainly centered in the central portion of the intermediate beam piece 12c, see Fig. 4A. The area exposed to dry mass is thus reduced faster.
    In another example of form of dehydration, a subgroup with openings 16 ”is arranged at a higher level than the other openings 16, so that the filtrate level of the filtrate channel 6 is equalized seen in the longitudinal direction. By placing the openings 16 ”relatively high, the filtrate flow is controlled so that the filtrate will flow into the anti-recovery beam 12 where only when the filtrate level is above a certain level. Possibly, kommer ltrat t.o.m. to da out from the anti-rewetting beam 12 where the atlrate level is low. The anti-rehydration beam 12 then acts as a filtrate distributor, which distributes the filtrate within the anti-rehydration beam 12 so that the filtrate level will be below the upper edge of the anti-rehydration beam in the entire filtrate channel 6 as soon as possible. See Fig. 4B, where the openings 16 "are located higher than the openings 16 in the middle portion.
    Additional beam - level safer As described above, sometimes the filtrate level in the filtrate channel 6 does not fall as fast as desired and sometimes the filtrate level drops at different speeds in different parts of the filtrate channel 6. According to an advantageous form of drying of the invention, which will now be described with reference to Figs. 5, it is proposed to provide an additional beam, herein referred to as level sink beam 20, together with the anti-wetting beam 12 of the filtrate channel 6. This embodiment requires that there be a connection between adjacent filtrate channels 6 through openings 8 in the side walls of the lateral walls. 6c, 6d. The level lowering beam 20 is an axially extending beam arranged at least in part in front of the anti-rewetting beam 12 and adapted for communication, through the front wall 6c, with an adjacent ("upper") channel channel 6. This means that, in the area around the nip, a liter can descend from the island. 6, via one or more of the openings 8 in the back wall 6d and into the level lower beam 20 of the filtrate channel 6 below it.
    By means of the level lowering beam 20, a considerable amount of the filtrate is transferred from a filtrate channel 6 to the filtrate channel 6 below it. In other words, an filtrate channel 6 can utilize a space belonging to the filtrate channel 6 below it. This is shown by dots in Fig. 5.
    The area of the filtrate channel 6 above the anti-rehydration beam 12 is significantly reduced and the filtrate level in the filtrate channel 6 will drop much faster below the upper edge of the anti-rehydration beam 12.
    As shown in Fig. 5, the external communication between the filtrate channel 6 in which the level lowering beam 20 is arranged and the adjacent filtrate channel 6 can be provided with at least one opening 22 in a beam piece 20a of the level lowering beam 20 adjacent the front wall 6c. The opening (s) 22 corresponds to or is smaller than the opening (s) in the front wall 6c. As shown in Fig. 6A (view corresponding to A '- A' in Fig. 5), the openings 22 may advantageously be concentrated in one or more areas of the beam piece 20a, to control the fate and achieve a desired fate pattern through the level lowering beam 20. The example shown has openings 22 which are more closely arranged in the middle of the level sinker beam to lower the filtrate level faster there.
    An alternative (not shown) to the beam piece 20a with openings 22, is that the communication between the filtrate channel 6 in which the level lowering beam 20 is arranged and the adjacent filtrate channel 6 is provided with opening (s) 8 in the front wall 6c, and that the level lowering beam 20 is arranged with and protrude from the front wall 6c. In this embodiment, the upper wall of the level lowering beam 20, i.e. the beam piece 20a, or at least a larger part of it is omitted. The cross section of the level sink beam 20 preferably forms itself in a closed form (when there is a beam piece 20a adjacent to the front wall 6c) or together with the front wall 6c (when the level sink beam 20 is arranged to protrude directly from the front wall 6c), except for the openings 22 or the openings 8, which allow fl uid to enter from the adjacent atltrate channel 6. In other words, there should be no interruptions in the axially extending beam pieces protruding from the front wall 6c. This means that the filtrate is not allowed to enter the level plywood beam 20 "from below", but only from the filtrate channel 6 which precedes the filtrate channel 6 in which the level lowering beam 20 is arranged.
    If there are openings distributed longitudinally along the level lowering beam 20, then the altered tr the width of the level lowering beam 20 will increase considerably towards its ends. Therefore, according to a tedious embodiment shown schematically in Fig. 6B, the level lowering beam 20 has a cross section increasing towards its end / s where the fl fate is discharged. Still referring to Fig. 6B, it may also be preferable to design the level lowering beam 20 with a downward slope toward its end (s). This is to increase the flow out of the level lowering beam 20 and thereby lower the filtrate level in the filtrate channel 6 faster.
    According to an advantageous embodiment, the level lowering beam 20 is adapted to be installed in front of the anti-wetting beam 12, so that radial movement of the anti-wetting beam 12 is possible.
    (The term "front" refers to the direction of rotation.) The lower edge of the level sinker beam 20 is then arranged above the top edge of the anti-rewetting beam 12, so that the anti-rewetting beam 12 can be moved radially without being obstructed by the level anchor beam 20. This simplifies cleaning of the permeable outer surface 4.
    According to an advantageous embodiment, the shape of the leveling beam carb 20 20 partly corresponds to the shape of the anti-rewetting beam 12, so that there is a substantially parallel ass fate passage 26 between the anti-rewetting beam 12 and the level lowering beam 20. In other words, the cross-sectional area is substantially constant. Fig. 5, the piece of the level lowering beam 20 which abuts the intermediate beam piece 12c of the anti-rewetting beam 12 has a corresponding shape and there is no restriction of the altered beam between the two beams 12, 20.
    According to an advantageous embodiment (not shown), the level lowering beam 20 is connected to the anti-wetting beam 12 to form an integrated structure. The level lowering beam 20 can then function to further support the anti-wetting beam 12, which contributes to the advantageous self-supporting feature of the anti-wetting beam 10. Although the invention has been described with reference to particularly shown embodiments, it is emphasized that it also covers equivalents of the shown features. modifications and variations which are obvious to those skilled in the art, and the scope of the invention is limited only by the appended claims.
    In particular, it should be understood that the shape of the anti-rehydration beam 12 may be varied within the scope of the invention. It can e.g. have only an intermediate beam piece 12c arranged to connect the front portion of the filtrate barrier 12a to the inner portion of the support member 12b, the rear portion of the filtrate barrier 12a being directly connected to the outer portion of the support member 12b. It is similarly possible for the anti-wetting beam to comprise two or two intermediate beam pieces 12c which together connect the front portion of the lattice barrier 12a to the arm portion of the support member 122, and / or two or two intermediate beam pieces 12c which connect the rear portion 1 of the lattice barrier 12a to the outer portion 12a.
    The shape of the level lowering beam 20 can also be varied within the scope of the invention. In the example of Fig. 5, the level lowering beam 20 has a substantially pentagonal shape. In another embodiment (not shown), the level lowering beam resembles a square. Those skilled in the art will recognize that various modifications are possible.
    权利要求:
    Claims (19)
    [1]
    A unit (10) for preventing rewetting of pulp in an apparatus (100) for washing and / or dewatering of cellulosic pulp, which apparatus comprises two press rollers (2), arranged to, during operation, rotate in opposite directions (R, R '), of which at least one of the press rollers has a permeable outer surface (4), inside which permeable outer surface a number of axially extending filtrate channels (6) are arranged, each filtrate channel having an outer wall (6a), an inner wall (6b) , a front wall (6c) and a back wall (6d), whereby pulp fed into the apparatus during operation is transported on the permeable outer surface in the direction of rotation and pressed into a nip (3) between the press rollers, which unit (10) for preventing rewetting is adapted to be installed in one of the filtrate channels and comprises - an axially extending anti-re-moisture beam (12), the cross-section of which at least at portions of the length of the anti-re-moisture beam forms a closed shape, where anti-re-wet bale the shaft in turn comprises - an axially extending atltrate barrier (12a) adapted to be placed against the outer wall of the atlrate channel to prevent liquid fl from the rear part of the atltrate channel to the outer surface of the press roll, - an axially extending support) (l2b) adapted to be located at least one axially extending intermediate beam piece (12c, 12c °), which connects the atltrate barrier to the support member, to form the closed shape of the anti-rewetting beam.
    [2]
    The rewetting prevention unit (10) according to claim 1, wherein the anti-rewetting beam (12) is substantially self-supporting, the atltrate barrier (12a) being supported in its position against the outer wall (6a) of the atltrate channel (6) of the support member (12b) and the middle beam piece / and (12c, 12c °).
    [3]
    The rewetting prevention unit (10) according to claim 1 or 2, wherein at least one intermediate beam piece (12c) of said at least one intermediate beam piece (12c, 12c ') is arranged to connect the front portion of the filtrate barrier (12a) to the support member (12b). inner part. 10 15 20 25 30 14
    [4]
    The rewetting prevention unit (10) according to claim 3, wherein at least one intermediate beam piece (12c °) of said at least one intermediate beam piece (12c, 12c °) is arranged to connect the rear portion of the filtrate barrier (12a) to the outer portion of the support member (12b).
    [5]
    The rewetting prevention unit (10) according to any one of the preceding claims, wherein the rewetting prevention unit (10) further comprises means (14) for attaching the end portions of the support member (12b), seen in the axial direction, to the atltrate channel (6). ) back wall (6d).
    [6]
    The rewetting prevention unit (10) according to claim 5, wherein the fastening means (14) are adapted for radial movement of the anti-rewetting beam (12) between a first position (P1), the atlrate barrier (12a) supporting against the outer wall of the atltrate channel (6) and a second position (P2) where the atltrate channel is at a distance from the outer wall of the trltrate channel to enable cleaning of the permeable outer surface (4) of the press roll (2) with the unit (10) to prevent rewetting still in the atlrate channel.
    [7]
    The rewetting prevention unit (10) according to claim 3 or 4, wherein at least one of the intermediate beam piece (s) (12c) connecting the fringe portion of the trlate barrier (12a) to the inner portion of the support member (12b) is provided with openings (16, 16 °). ) so that atltrate can da spoil within the anti-rewetting beam (l. 2).
    [8]
    The rewetting prevention unit (10) according to claim 7, wherein the openings (16, 16 ") are concentrated in one or more areas of the intermediate beam piece (12c), to control the flow and achieve a desired pattern of fate through the intermediate beam piece through the anti-rewetting beam (12). ).
    [9]
    The rewetting prevention unit (10) of claim 8, wherein the openings (16) are centered substantially in the central portion of the intermediate beam piece (12c) as seen in the axial direction. 10 15 20 25 30 15
    [10]
    The rewetting prevention unit (10) according to claim 8, wherein a subset of openings (16 °) are arranged at a higher level than the other openings (16), so that the filrate level in the atltrate cartilage is equalized, seen in the longitudinal direction.
    [11]
    11. ll. The rewetting prevention unit (10) according to any one of the preceding claims, wherein the rewetting prevention unit (10) is adapted to be installed in one of the filtrate channels (6) in an apparatus (100) for washing and / or dewatering cellulose pulp with mellan connection between adjacent atltrate channels by means of opening (s) (8) in the side walls (6c, 6d) of the atltrate channels, wherein the unit (10) for preventing rewetting further comprises an axially extending level sinker beam (20) adapted to be arranged at least partially in front of the anti-moisture beam 12) and adapted for external communication, through the front wall (6c), with an adjacent atltrate channel (6).
    [12]
    The rewetting prevention unit (10) according to claim 11, wherein the communication between the filtrate channel (6) in which the level lowering beam (20) is arranged and the adjacent secondary channel is provided by at least one opening (22) in one of the beam pieces of the level lowering beam (20). (20a) adjacent to the front wall (6c), which opening (22) corresponds to or is smaller than the opening (s) (8) of the front wall (6c).
    [13]
    The rewetting prevention unit (10) of claim 12, wherein the apertures (22) are concentrated in one or more areas of the beam piece (20a) to guide the flow through the level lowering beam and provide a desired fate pattern through the level lowering beam (20).
    [14]
    The rewetting prevention unit (10) according to claim 11, wherein the communication between the filtrate channel (6) in which the level lowering beam (20) is arranged and the adjacent filtrate channel is provided with opening (s) (8) in the front wall (6c), and the level lowering beam (20) is arranged to be connected to and project from the front wall (6c).
    [15]
    The rewetting prevention unit (10) according to any one of claims 11-14, wherein the level lowering beam (20) has a cross section which increases towards its end (s), where fl the fate is discharged. 10 15 20 16
    [16]
    The rewetting prevention unit (10) according to any one of claims 11-15, wherein the level lowering beam (20) is arranged to be installed in front of the anti-rewetting beam (12), so that radial movement of the anti-rewetting beam (12) is possible.
    [17]
    The rewetting prevention unit (10) according to any one of claims 11-16, wherein the shape of the level sink beam (20) partially corresponds to the shape of the anti-wet beam (12), so that there is a substantially parallel flow passage (26) between the anti-wet beam and the level sink beam.
    [18]
    The rewetting prevention unit (10) according to any one of claims 11-17, wherein the level locking beam (20) is connected to the anti-wetting beam (12) to form an integrated structure.
    [19]
    A press roll (100) for washing and / or dewatering cellulosic pulp, which press roll comprises the unit (10) for preventing rewetting of pulp according to any one of the preceding claims.
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    同族专利:
    公开号 | 公开日
    CN103987892A|2014-08-13|
    EP2766523A1|2014-08-20|
    WO2013055284A1|2013-04-18|
    CA2851609A1|2013-04-18|
    SE536171C2|2013-06-11|
    EP2766523A4|2015-07-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4370231A|1981-09-04|1983-01-25|Lavalley Industrial Plastics, Inc.|Rotary drum filter|
    US4581139A|1983-10-06|1986-04-08|Dorr-Oliver Incorporated|Filtrate run-back baffle for rotary drum vacuum filter|
    US4663040A|1985-11-22|1987-05-05|Elizondo H J|Rotary drum filter grid extension and method|
    US4906364A|1988-12-29|1990-03-06|Ingersoll-Rand Company|Filter deck assembly sliding seal|
    US5244572A|1991-12-06|1993-09-14|Lavalley Industries, Inc.|Rotary drum filter with improved deck structure|
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    SE528867C2|2005-07-04|2007-03-06|Metso Paper Inc|Roll body for press roll and roll press comprising two press rolls|
    SE531236C2|2007-05-15|2009-01-27|Metso Paper Inc|Mass washing device and method|
    WO2008147310A1|2007-05-25|2008-12-04|Metso Paper, Inc.|Arrangement for washing and dewatering cellulose pulp|
    SE533558C2|2009-03-04|2010-10-26|Metso Paper Inc|Device in washing press to prevent rewetting|
    SE534655C2|2009-12-15|2011-11-08|Metso Paper Inc|Drum for processing cellulose pulp, apparatus comprising the drum and method of making the drum|SE537853C2|2013-05-07|2015-11-03|Valmet Oy|Apparatus for washing and / or dewatering pulp with an insert for preventing pulp rewetting|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1150946A|SE536171C2|2011-10-12|2011-10-12|Unit for preventing rewetting of cellulose pulp during washing and / or dewatering|SE1150946A| SE536171C2|2011-10-12|2011-10-12|Unit for preventing rewetting of cellulose pulp during washing and / or dewatering|
    PCT/SE2012/051089| WO2013055284A1|2011-10-12|2012-10-11|Device for preventing rewetting of cellulose pulp|
    CN201280050223.8A| CN103987892A|2011-10-12|2012-10-11|Device for preventing rewetting of cellulose pulp|
    EP12839805.4A| EP2766523A4|2011-10-12|2012-10-11|Device for preventing rewetting of cellulose pulp|
    CA 2851609| CA2851609A1|2011-10-12|2012-10-11|Device for preventing rewetting of cellulose pulp|
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