• 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:

    公开号:SE0950906A1
    申请号:SE0950906
    申请日:2009-11-27
    公开日:2011-05-28
    发明作者:Fredrik Naeslund
    申请人:Andritz Oy；
    IPC主号:
    专利说明:

    This object is achieved by means of a sealing device according to the preamble, which sealing device is characterized in that it comprises a first sealing ring, in which a replaceable first sealing strip is attached, which first sealing strip is arranged to slide against the drainage drum when it rotates, and one on an axial spaced from the first sealing ring is arranged a second sealing ring, in which a replaceable second sealing strip is attached, which second sealing strip is arranged to slide against the drainage drum as it rotates, both the first and the second sealing ring being fixed in a common holding device, which is located at the first sealing ring, the second sealing ring being secured in the retaining device by means of at least one spacer, and wherein at least a portion of the first sealing ring is releasable from the retaining device for sliding along said at least one spacer to allow replacement of the first sealing strip.
    An advantage of this sealing device is that the first sealing strip can be replaced without the need for the second sealing ring to be dismantled. This facilitates the maintenance of the sealing device since only a minimum of disassembly work is required.
    According to one embodiment, said at least one spacer extends through at least a part of the first sealing ring. An advantage of this embodiment is that the spacer means will function as a guide for the at least a part of the first sealing ring, so that it can be moved back and forth in a simple and controlled manner, between a mounted and a disassembled position.
    According to one embodiment, the first sealing ring and the second sealing ring are arranged on either side of a drainage device which comprises at least one opening formed in the periphery of the dewatering drum axially outside the liquid-permeable layer for draining liquid from the dewatering drum. An advantage of this embodiment is that the sealing device prevents splashing and splashing of liquid drained from the drum.
    Preferably, a filtrate cover extends between the first sealing ring and the second sealing ring at a radial distance from the dewatering drum, a filtrate space being formed between the sealing rings, the filtrate cover 10 and a portion of the outer periphery of the dewatering drum. An advantage of this embodiment is that a very efficient collection of drained liquid can be achieved.
    According to a preferred embodiment, the first sealing ring is provided with a first flange which extends in axial direction towards the second sealing ring, the second sealing ring being provided with a second flange which extends in axial direction towards the first sealing ring, wherein the filtrate cover rests on said first and second flanges. An advantage of this embodiment is that the filtrate cane is supported in an efficient and robust manner at a suitable distance from the dewatering drum.
    According to one embodiment, the first sealing ring is located next to the liquid-permeable layer, wherein in addition to said first sealing strip a third sealing strip is also attached to the first sealing ring, one of said first and third sealing strips being a radial sealing strip arranged to slide against drainage space and drainage space. wherein the second of said first and third sealing strips is an axial sealing strip, which is arranged to slide against a wear ring arranged on the liquid-permeable layer. An advantage of this embodiment is that the combination of a radial sealing strip and an axial sealing strip in the first sealing ring results in a very effective sealing of the pressing device, so that liquid suspension does not leak from the pressing device and mix with filtrate. According to a preferred embodiment, pressurized fresh water can be supplied to the space delimited by the radial sealing strip, the axial sealing strip, the periphery of the drum and the first sealing ring. This fresh water helps to lubricate and cool the contact surfaces between the respective sealing strip and the drum, respectively the wear ring. In addition, the fresh water washes away the material, such as fibers, that may enter between the axial sealing strip and the radial sealing strip.
    According to a preferred embodiment, the first sealing ring comprises a first sealing holder and a first sealing holder cover which hold the first sealing strip between them, the first sealing holder and the first sealing holder cover being arranged to be disassembled when replacing the first sealing strip. An advantage of this embodiment is that the first sealing strip is held in an effective manner in the first sealing ring, but is still easy to replace. For example, the first seal holder cover can be detached during such replacement, while the first seal holder is allowed to remain in the mounted position.
    According to one embodiment, the second sealing ring comprises a second sealing holder and a second sealing holder lid which between them hold the second sealing strip, the second sealing holder being attached to said at least one spacer. An advantage of this embodiment is that the second sealing strip can be held in an efficient manner, at the same time as the second sealing holder is attached to the spacer and does not need to be dismantled when the second sealing strip is to be replaced.
    According to a preferred embodiment, the second seal holder cover is releasable from the second seal holder independently of said at least one spacer. An advantage of this embodiment is that the second seal holder cover can be easily removed for replacement of the second sealing strip, without the spacer having to be completely or partially disassembled.
    Suitably, said spacer is a rod which is attached to the holding device at one end, and which is attached to the other sealing ring at its other end. An advantage of this embodiment is that a rod is an efficient and yet inexpensive device for holding the second sealing ring.
    Furthermore, one or more parts of the first sealing ring can easily be arranged to slide along a rod, for example by making openings in one or more parts of the first sealing ring, so that these parts can run along the rod during disassembly.
    Additional objects and features of the present invention will become apparent from the description and claims.
    Brief Description of the Drawings The invention will now be described in more detail with reference to the accompanying drawings.
    Fig. 1 is a schematic cross-sectional view illustrating an apparatus for dewatering cellulose pulp.
    Fig. 2 is a perspective view in cross section and shows a drainage drum.
    Fig. 3 is an enlargement of the area III shown in Fig. 2.
    Fig. 4a is an enlarged perspective view in cross section and shows a sealing device.
    Fig. 4b shows the sealing device shown in Fig. 4a seen in a two-dimensional cross-section.
    Fig. 5a is an enlarged perspective view in cross section and illustrates the replacement of an outer radial sealing strip.
    Fig. 5b is an enlarged perspective view in cross section and illustrates replacement of an inner radial sealing strip. Fig. 5c is an enlarged perspective view in cross section and illustrates replacement of an axial sealing strip.
    DESCRIPTION OF PREFERRED EMBODIMENTS Fig. 1 illustrates, seen from the side and in cross section, a dewatering device in the form of a press 1 for dewatering a liquid suspension of a solid biological material, such as cellulose pulp. The press 1 has a first dewatering drum 2 and a second dewatering drum 4. The dewatering drum 2 is arranged to rotate counterclockwise, as indicated by an arrow R in Fig. 1. The dewatering drum 4 is arranged to rotate in the opposite direction, i.e. clockwise, but has in otherwise similar parts and function as the first dewatering drum 2, although the second dewatering drum 4 is mirrored in relation to the first dewatering drum 2, so the second dewatering drum 4 is not described in more detail.
    The press 1 further comprises a pressing device in the form of a trough 6 inside which the first dewatering drum 2 is arranged to rotate. At its one side, the trough 6 has an inlet 8 for a liquid suspension of cellulose pulp, i.e. a liquid suspension which contains cellulose pulp and which has a dry content of typically 3-15% by weight of TS. The trough 6 is provided with a number of liquid inlets 10 through which washing liquid can be supplied to the mass.
    When dewatering a liquid suspension, the suspension is fed to the trough 6 via the inlet 8, as shown by an arrow M, and then pressed into the gap 12 formed between the trough 6 and the drum 2. The liquid containing the suspension will be pressed in through the periphery of the drum 2 and into the inside of the drum 2, as shown by an arrow Wi Fig. 1. Supplied washing liquid will also be pressed into the inside of the drum 2, as indicated by an arrow C.
    The compressed liquid will collect at the bottom of the drum 2 and will flow out therefrom, in a manner to be described in more detail below with reference to Fig. 2.
    When the mass has been sufficiently dewatered, it leaves the trough 6 at the point 14 shown in Fig. 1 and will then be pressed against the mass which has been dewatered in a corresponding manner on the second dewatering drum 4. A scraper 16 is arranged to scrape off the dewatered the cellulose pulp, which may typically have a dry content of 25-40% by weight TS, from the drum 2, the dewatered pulp being pressed up into a collecting channel 18 and leaving the device 1, as illustrated by an arrow P. Fig. 2 is a cross section and shows the first drainage drum 2 seen in the section shown in Fig. 1 | - |. The drum 2 has two end plates 20, 22 which are arranged at each end of the drum 2 and each have a shaft pin 24, 26 for storing the drum 2 in the press 1.
    The drainage drum 2 has a support tube 28 which has the shape of a cylindrical sleeve which is fixed in the two end plates 20, 22. The support tube 28 is provided with a number of openings 30, which are substantially evenly distributed over the support tube 28, as also shown in Fig. 1. Through these openings 30 liquid can pass into the interior of the drum 2, when liquid is forced out of the mass of the trough 6.
    The support tube 28 has a length LS which is significantly greater than the length LT of the portion of the support tube 28 enclosed by the trough 6. Thus, the trough 6 will only enclose the support tube 28 along a partial length LT of the entire length LS of the support tube 28. A drainage device in the form of a group 32 of drainage openings 33 are arranged in the support tube 28 outside the area enclosed by the trough 6. The group 32 of openings 33 is thus arranged in the outermost portion of the support tube 28, seen in the axial direction. The liquid pressed into the drum 2 in the portion enclosed by the trough 6 will flow in the axial direction towards this group 32 of openings 33, and will leave the drum 2 via the openings 33 in the group 32 as a liquid flow R, the drum 2 drained of liquid. The liquid flow R leaves the drum 2 via an outlet funnel 34.
    A sealing device 36 is arranged adjacent the group 32 of openings 33 in order to prevent liquid from the trough 6 from leaking into the environment, and also in order to collect the liquid passing out of the drum 2 through the openings 33 included in the group 32. The sealing device 36 will be described in more detail below with reference to Figs. 4a and 4b. At the opposite end of the trough 6, a sealing device 37 is arranged to prevent liquid from the trough 6 from leaking into the environment also from that end of the trough 6.
    On the outside of the support tube 28, in the portion of the support tube 28 enclosed by the trough 6, a liquid transport layer 38 is arranged, which is arranged to catch dewatered mass on its outside, and to let liquid through, so that the liquid can pass into the openings 30 into the drum 2. Fig. 3 shows in more detail the area III in Fig. 2 for the purpose of describing in more detail the liquid transport layer 38. On the outside of the support tube 28, which is typically made of a metal material with a material thickness T of 15-70 mm, spacers are provided in the form of lamella rings 40, which run around the periphery 42 of the support tube 28. The lamella rings 40 suitably have a height, measured from the periphery 42 of the support tube 28, of about 20-70 mm. A number of stiffening tubes 44 extending through the lamella rings 40 in the axial direction along the support tube 28, as also indicated in Fig. 1, keep the lamella rings 40 at a desired distance from each other.
    A liquid-permeable layer in the form of a screen plate 46 has been arranged on the outside of the lamella rings. Between the lamella rings 40, each having a wall thickness of about 3-7 mm, open channels 48 are formed which extend substantially around the periphery 42 of the support tube 28. such channel 48 is about 10-30 mm.
    The liquid transport layer 38 has at its outer end a wear ring 50, which is made of an abrasion-resistant material, such as steel, and is intended to form a sliding surface for the sealing device in the manner to be described below.
    When the drum 2 is used for dewatering a liquid suspension of cellulose pulp, liquid which is forced out of the pulp in the gap 12 shown in Fig. 1 will pass through the sieve plate 46, further through the gaps 48 between the lamella rings 40 and into the interior of the drum 2. via the openings 30 formed in the support tube 28, as shown by an arrow W in Fig. 3. The support tube 28 is free of internal structures which tend to carry this liquid during the rotation of the drum 2, so that the liquid will quickly flow to the bottom of the drum. 2, as shown in Fig. 1. The liquid collected at the bottom of the drum 2 will rapidly flow in the axial direction along the drum 2, as shown in Fig. 2, in the direction of the openings 33 included in the group 32 and to leave the drum 2 via these openings 33 included in the group 32, as shown by the arrow R in Fig. 2.
    The sealing device 36 will now be described in more detail with reference to Fig. 4a and Fig. 4b.
    Fig. 4a is an enlarged perspective view, in cross section, showing the sealing device 36 in more detail, and Fig. 4b is a two-dimensional cross-sectional view of the sealing device 36. The sealing device 36 comprises a first sealing ring, in the form of a inner sealing ring 52, and a second sealing ring, in the form of an outer sealing ring 54. Between the sealing rings 52, 54 extends a filtrate cover 56, which is arranged to collect the filtrate leaving the dewatering drum 2 via the openings 33 included in the group 32 described above. The filtrate cover 56 also extends around the periphery of the drum 2 and connects to the outlet funnel 34 shown in Fig. 2. A filtrate space 57 is formed, as best seen in Fig. 4b, between the drum 2 and the filtrate cover 56. In the filtrate space 57, the liquid leaving the openings 33 included in the group 32 are led to the outlet funnel 34 shown in Fig. 2.
    The sealing device 36 is fixed in a holding device in the form of a frame end 58, which also carries the trough 6 shown in Fig. 1 and Fig. 2, as best shown in Fig. 2. As can be seen from Figs. 4a and 4b, the inner sealing ring 52 a first seal holder in the form of an inner seal holder 60, and a first seal holder lid in the form of an inner seal holder lid 62. The inner seal holder lid 62 is, as best seen in Fig. 4b, provided with a first flange in the form of a horizontal end 64, on which the filtrate cover 56 rests. A sealing strip 66 runs in a groove 68 which has been formed in the side of the horizontal flange 64 facing away from the drum 2. The sealing strip 66 is arranged to seal the space between the filtrate cover 56 and the flange 64, so that liquid leaving the openings 33 included in the group 32 should not leak out.
    The inner sealing holder 60 has a horizontal groove 70, which groove has its opening facing the wear ring 50 of the liquid transport layer 38 shown in Fig. 2.
    A replaceable axial sealing strip 72 is provided in the groove 70 and abuts the wear ring 50. The axial sealing strip 72 thus seals the sealing device 36 against the liquid transport layer 38, so that neither the liquid suspension to be dewatered by pressing against the filter plate 46 included in the liquid transport layer 38 6 to the filtrate compartment 57.
    The inner seal holder 60 also has a radial groove 74, which groove has its opening facing the drum 2. A replaceable first radial sealing strip 76 is, as shown in Fig. 4b, arranged in the groove 74 in a position, seen in axial direction, which is located between the liquid transport layer 38 and the group 32 of openings 33. On the periphery of the drum 2 a wear sleeve 78 of an abrasion resistant material, such as steel, is arranged, against which the first radial sealing strip 76 abuts. The seal holder cover 62 keeps the radial seal strip 76 enclosed in the groove 74.
    According to one embodiment, pressurized fresh water can be supplied to the space best seen in Fig. 4b, which is delimited by the axial sealing strip 72, the radial sealing strip 76, the inner sealing holder 60 and the periphery of the drum 2.
    This fresh water will partially seep out between the axial sealing strip 72 and the wear ring 50, as well as between the radial sealing strip 76 and the wear sleeve 78 and helps to lubricate and cool the abutment surface between the axial sealing strip 72 and the wear ring 50, and the contact surface between the radial sealing strip 76 and the wear sleeve 78. materials, such as fibers, which may enter between the axial sealing strip 72 and the radial sealing strip 76.
    The outer sealing ring 54 comprises a second sealing holder in the form of an outer sealing holder 80, and a second sealing holder lid in the form of an outer sealing holder lid 82. The outer sealing holder 80 is, as best seen in Fig. 4b, provided with a second flange in the form of a horizontal flange 84, on which the filtrate cover 56 rests. A sealing strip 86 runs in a groove 88 which has been formed in the side of the horizontal flange 84 facing away from the drum 2. The sealing strip 86 is arranged to seal the space between the filtrate cover 56 and the flange 84, so that liquid leaving the openings 33 included in the group 32 should not leak out.
    The outer seal holder 80 has a radial groove 90, which groove has its opening facing the drum 2. A replaceable second radial sealing strip 92 is arranged in the groove 90 in a position, seen in axial direction, which is located outside the group 32 of openings 33. On a wear sleeve 94 of an abrasion-resistant material, such as steel, against which the second radial sealing strip 92 abuts is arranged. The seal holder cover 82 keeps the second radial seal strip 92 enclosed in the groove 90.
    The inner sealing ring 52 and the outer sealing ring 54 are attached to the frame end 58 in such a way that the axial sealing strip 72 and the first radial sealing strip 76 can be replaced without the outer sealing ring 54 having to be dismantled. Furthermore, the second radial sealing strip 92 can be replaced without the need to disassemble the inner sealing ring 52. This is accomplished in the following manner. Bolts of a first bolt type 96 are, as best seen in Fig. 4a, arranged to extend through the inner sealing heel cover 62 and secure it to the inner sealing holder 60. The bolts of the first bolt type 96 are threaded into the sealing holder 60 and are arranged to press the seal. the holder cover 62 against the inner sealing holder 60.
    Bolts of a second bolt type 98 are arranged to extend through the outer sealing heel cover 82 and into the outer sealing holder 80. The bolts of the second bolt type 98 are threaded into the outer sealing holder 80 and are arranged to hold together the outer sealing heel cover 82 and the outer the seal holder 80. The bolts of the second bolt type 98 will thus hold together the outer sealing ring 54.
    Bolts of a third bolt type 100 are used together with spacers in the form of spacer rods, a spacer rod 102 of which is shown in Figs. 4a and 4b.
    The bolts of the third bolt type 100 are arranged to each extend into a drilled end of a respective spacer rod 102. Each spacer rod 102 extends through a respective opening 104 in the inner sealing holder cover 62, which opening 104 has the shape of a recess provided in the outer portion of the seal holder cover 62, and a respective opening 106 in the inner seal holder 60, which opening 106 has, as best seen in Fig. 4b, the shape of a heel drilled through the seal holder 60. Each spacer rod 102 has, at the end of the spacer rod 102 located closest to the liquid transport layer 38, a threaded end. This threaded end is screwed into the frame end 58 and attaches the spacer bar 102 to the frame end 58. At its other end, i.e. the end located closest to the outer sealing ring 54, the spacer rod 102 rests against the outer sealing bracket 80.
    The bolts of the third bolt type 100 abut the outer seal bracket 80, extend through the outer seal bracket 80, and further into the drilled end of the solid spacer bar 102. As the bolts of the third bolt type 100 are tightened, they will press it. outer sealing bracket 80 against the spacer rod 102, which in turn is attached to the frame end 58.
    The bolts of the third bolt type 100 will thus, via the spacer rod 102, fasten the outer sealing ring 54 against the frame end 58. The spacer rod 10 will, as it carries off against the outer seal holder 80 and the frame end 58, maintain a constant distance between the outer sealing ring 54 and the inner sealing ring 52, since both sealing rings 52, 54 are attached to the frame end 58, and the outer sealing ring 54 is kept at a constant distance from the inner sealing ring 52 by means of the spacer bar 102.
    Fourth bolt type bolts 108 are used to secure the inner seal holder 60 to the frame end 58. The bolts of the fourth bolt type 108 are disposed between the inner seal holder cover 62 and the inner seal holder 60, and become accessible only when the inner seal holder cover 62 has been disassembled. . According to an alternative embodiment, openings may be formed in the inner seal holder cover 62 opposite the bolts of the fourth bolt type 108, so that the bolts of the fourth bolt type 108 may be accessed even when the inner seal holder cover 62 is mounted on the inner seal holder 60.
    The sealing strips 72, 76 and 92 can be of different suitable types, such as homogeneous rubber strips, hose-shaped and expandable strips, fl eaten strips, etc.
    The sealing device 37 shown in Fig. 2 may have a similar design as the sealing device 36, but mirrored. Since liquid in the embodiment shown in Fig. 2 is only drained through the group 32 of holes 33 in one end of the drainage drum 2, the sealing device 37 can advantageously be formed with only an inner sealing ring 52, i.e. without an outer sealing ring 54 and without spacer 102.
    Figs. 5a-5c illustrate how the sealing strips 72, 76, 94 attached to the sealing rings 52, 54 can be replaced independently of each other.
    Fig. 5a illustrates how a worn or damaged second radial sealing strip 92 can be replaced. The bolts of the second bolt type 98 are unscrewed from the outer seal holder cover 82 and the outer seal holder 80. Thus, the outer seal holder cover 82 is released and can be moved away in a leftward direction, as illustrated by an arrow in Fig. 5a. The radial sealing strip 92 can now be removed from the radial groove 90 and discarded, or repaired. Thereafter, a new, or repaired, radial sealing strip 92 is inserted into the groove 90. The new radial sealing strip 92 may be in the form of an entire circular ring, which wraps around the drainage drum 2. However, it is often preferred, for mounting reasons, that the sealing strip 10 15 20 25 92 has a pitch along its length so that it can be more easily threaded into the groove 90 around the drainage drum. For example, the new radial sealing strip 92 may be provided by the meter, of which a piece of suitable length is cut, which piece is placed in the groove 90, and whose ends are then, for example, bolted and / or vulcanized together so that the radial sealing strip 92 will form an unbroken circular sealing strip. It is also possible, in order to facilitate assembly, to divide the sealing strip 92 into a number of segments along its length. When a new radial sealing strip 92 has first entered the groove 90, the seal holder cover 82 is returned and mounted on the seal holder 80 to hold the radial sealing strip 92 in the groove 90. Thus, replacement of the second radial sealing strip 92 can be performed without disassembling the inner sealing ring 52 or filtrate cover 56. the outer seal holder 80 is attached to the spacer bar 102 throughout the replacement process by means of the bolts of the third bolt type 100.
    Fig. 5b illustrates how a worn or damaged first radial sealing strip 76 can be replaced. In a first step, the filtrate cover 56 shown in Figs. 4a-b is disassembled.
    The filtrate cover 56 is suitably formed as a sweep with a split, or as a number of segments, which facilitates removal of the filtrate cover 56. With the filtrate cover removed, the bolts of the first bolt type 96 are unscrewed from the inner seal holder cover 62 and the inner seal holder 60. inner seal holder cover 62 and can be moved away in a leftward direction, and along the spacer bar 102, as illustrated by an arrow in Fig. 5b. The radial sealing strip 76 can now be removed from the radial groove 74, as shown by an arrow in Fig. 5b, and discarded, or repaired. Thereafter, a new, or repaired, radial sealing strip 76 is inserted into the groove 74. The new radial sealing strip 76 may, like the above-mentioned radial sealing strip 92, be in the form of an entire circular ring, which wraps around the drainage drum, having a pitch along its length, can be more easily threaded into the groove 74, or be divided into a plurality of segments along its length. When a new radial sealing strip 76 has first entered the groove 74, the seal holder cover 62 is returned and mounted on the seal holder 60 by means of the bolts of the first type 96, to hold the radial sealing strip 76 in the groove 74. Thereafter, the filtrate cover 56 is reassembled. The first radial sealing strip 76 is made without removing the inner sealing holder 60 or the outer sealing ring 54.
    Fig. 5c illustrates how a worn or damaged axial sealing strip 72 can be replaced. In a first step, the filtrate cover 56 shown in Figs. 4a-b and the inner seal holder cover 62 are disassembled in accordance with what has been described above with reference to Fig. 5b. Thereby, the inner sealing holder cover 62 is released and can be moved away in the direction to the left. As the seal holder cover 62 is moved to the left, the bolts of the fourth bolt type 108 will become available. The bolts of the fourth bolt type 108 are loosened, releasing the inner seal holder 60 from the frame end 58. The inner seal holder 60 is then moved to the left, as shown in Fig. 5c, and slides along the spacer bar 102 thanks to the opening 106. The axial sealing strip 72 can now be removed. out of the axial groove 70 and discarded, or repaired. Thereafter, a new, or repaired, axial sealing strip 72 is inserted into the groove 70. The new axial sealing strip 72 may, like the above-mentioned radial sealing strips 76, 92, be in the form of an entire circular ring which wraps around the drainage drum, having a pitch along its length, so that it can more easily be threaded into the groove 70, or be divided into a plurality of segments along its length. When a new axial sealing strip 72 has been inserted into the groove 70, the sealing bracket 60 is moved to the right and along the spacer bar 102, towards the frame end 58 and is mounted on the frame end 58 by means of the bolts of the fourth bolt type 108. Thus, the axial sealing strip 72 is secured to the ring 50.
    Thereafter, the seal holder cover 62 is moved to the right towards the seal holder 60 and mounted on the seal holder 60 by means of the bolts of the first bolt type 96. Thus, replacement of the axial seal strip 72 can be performed without disassembling the outer seal ring 54. According to an alternative embodiment described above, openings can be provided in the seal holder cover 62 so that the bolts of the fourth bolt type 108 become accessible even without disassembly of the seal holder cover 62. According to this alternative embodiment, the axial seal strip 72 can be replaced without removing the bolts of the first bolt type 96. and the sealing cap 62 as a cohesive unit is moved to the left when the bolts of the fourth bolt type 108 have been disassembled. It will be appreciated that many variants of the embodiments described above are possible within the scope of the appended claims.
    Above, with reference to Fig. 2, a drainage drum has been described which has a drainage device in the form of a group 32 of openings 33 at its one end, through which group of openings compressed liquid can flow out.
    It will be appreciated that the drainage drum may also be provided with an additional drainage device, of the same type which comprises a group of openings, at its opposite end. The latter is suitable when the drum is very long, for example over 4 meters, because with such long drums it can be difficult to get all the liquid out in a single end of the drum. In such a case, with a very long drum, a sealing device 36 of the type described above is arranged at each end of the dewatering drum, i.e. the sealing device 37 shown in Fig. 2 has the same design as the sealing device 36, but mirrored.
    It is described above, with reference to Figs. 4a and 4b, how the inner seal holder cover 62 has openings 104, which have the shape of recesses arranged in the outer portion of the seal holder cover 62, and that the inner seal holder 60 has openings 106 in the form of through the seal holder 60 drilled holes. These apertures 104, 106 allow the inner seal holder cover 62 and the inner seal holder 60 to slide off along the spacer bar 102. It will be appreciated that such a slide offset may be provided in other ways.
    For example, the seal holder cover 62 may instead be provided with drilled holes through which the spacer bar 102 runs. A further possibility is that the seal holder cover 62 and / or the seal holder 60 are located in their entirety between the spacer rod 102 and the drainage drum 2, whereby the seal holder cap 62 and / or the seal holder 60 can easily be slid along and under the spacer rod 102, even in the absence of openings.
    The seal holder caps 62 and 82 described above may be circular caps, which run around the entire drum 2. It is also possible, and sometimes preferred for both maintenance and manufacturing reasons, for one or both of the seal holder caps 62, 82 to be formed with several segments. , for example as two semicircles which together enclose the drum 2. The seal holders 60, 80 can also be formed in the form of circular parts, which run around the entire drum 2, or in the form of two or more segments.
    A spacer in the form of cylindrical spacer rods 102 is described above. It will be appreciated that the spacer means may have other shapes, such as square rods, oval rods, and also more complicated shapes, which allow the outer sealing ring 54 to be attached to the same retaining device. , such as the frame end 58, as the inner sealing ring 52, wherein at least a part of the inner sealing ring 52 can still be slidably slid along the spacer.
    It has been described above how the holding device, in the form of the frame end 58, is arranged next to the inner sealing ring 52. It is understood that a holding device can instead, as an alternative, be arranged next to the outer sealing ring 54, the inner sealing ring 52 being attached to such a holding device. of spacers of a similar type as described above with reference to Figs. 4a-b.
    The press 1 described above is provided with a liquid inlet 10 for washing liquid. Such a press can be called a washing press. The sealing device described above can of course also be used for other types of presses, including such presses which are not provided with any devices for washing the material being dewatered. Such presses, which do not have washing devices, are sometimes called drainage presses.
    It has been described above how the sealing device 36 is used in dewatering a liquid suspension containing cellulose fibers. It will be appreciated that the sealing device 36 may also be used in dewatering other types of suspensions of solid biological materials. Examples of such materials are different types of biomasses which must be dewatered, and possibly washed, before use for the production of fuel, for example by an ethanol production process, a biogas production process, or a fuel pellet production process, or before combustion of the biomass. Examples of biomasses that can be dewatered in the press described above include straw, bagasse, other annuals, grass, tops, leaves, conifers, seaweed, moss, etc.
    The liquid in the suspension may be water, but also other liquids, for example various organic or inorganic solvents, may be present in the suspension to be dewatered.
    权利要求:
    Claims (10)
    [1]
    A sealing device for a press (1) for dewatering a liquid suspension of a solid biological material, which press (1) comprises a rotatable dewatering drum (2) provided with a liquid-permeable layer (46), and a press device (6) which is arranged to press the liquid suspension against the liquid-permeable layer (46) in such a way that liquid is pressed into the dewatering drum (2), the sealing device sealing the pressing device (6) against the dewatering drum (2), characterized in that the sealing device (36) first sealing ring (52), in which a replaceable first sealing strip (76) is attached, which first sealing strip (76) is arranged to slide against the drainage drum (2) as it rotates, and one at an axial distance from the first sealing ring (76). 52) arranged second sealing ring (54), in which a replaceable second sealing strip (92) is attached, which second sealing strip (92) is arranged to slide against the drainage drum (2) as it rotates, wherein both the first and the second sealing ring (52, 54) are fixed in a common holding device (58) located at the first sealing ring (52), the second sealing ring (54) being fixed in the holding device (58) by at least one spacer means (102), and wherein at least a portion (60, 62) of the first sealing ring (52) is releasable from the retaining device (58) for sliding along said at least one spacer member (102) to allow replacement of the first sealing strip (76). ).
    [2]
    The sealing device of claim 1, wherein said at least one spacer (102) extends through at least a portion (60) of the first sealing ring (52).
    [3]
    Sealing device according to any one of claims 1-2, wherein the first sealing ring (52) and the second sealing ring (54) are arranged on either side of a drainage device (32) which comprises at least one opening (33) formed in the drainage drum. (2) peripheral axially outside the liquid permeable layer (46) for draining liquid from the dewatering drum (2).
    [4]
    Sealing device according to claim 3, wherein a filtrate cover (56) extends between the first sealing ring (52) and the second sealing ring (54) at a radial distance from the dewatering drum (2), a filtrate space (57) being formed between the sealing rings (52, 54), the filtrate cover (56) and a portion of the outer periphery of the drainage drum (2).
    [5]
    A sealing device according to claim 4, wherein the first sealing ring (52) is provided with a first flange (64) extending in the axial direction towards the second sealing ring (54), the second sealing ring (54) being provided with a second flange (84) extending in the axial direction towards the first sealing ring (52), the filtrate cover (56) resting on said first and second flanges (64, 84).
    [6]
    A sealing device according to any one of the preceding claims, wherein the first sealing ring (52) is located adjacent to the liquid-permeable layer (46), wherein in addition to said first sealing strip (76) also a third sealing strip (72) is attached to the first sealing ring (52). ), one of said first and third sealing strips being a radial sealing strip (76) arranged to slide towards the periphery of the drainage drum (2), and the second of said first and third sealing strips being an axial sealing strip (72) arranged to slide against a wear ring (50) arranged next to the liquid-permeable layer (46).
    [7]
    A sealing device according to any one of the preceding claims, wherein the first sealing ring (52) comprises a first sealing holder (60) and a first sealing holder lid (62) which hold the first sealing strip (76) therebetween, the first sealing holder (60 ) and the first seal holder cover (62) are arranged to be disassembled when replacing the first seal strip (76).
    [8]
    A sealing device according to any one of the preceding claims, wherein the second sealing ring (54) comprises a second sealing holder (80) and a second sealing holder lid (82) which hold the second sealing strip (92) therebetween, the second sealing holder (80) ) is attached to said at least one spacer (102). 18
    [9]
    The sealing device of claim 8, wherein the second seal holder cover (82) is releasable from the second seal holder (80) independently of said at least one spacer (102).
    [10]
    Sealing device according to any one of the preceding claims, wherein said spacer means is a rod (102) attached at one end to the holding device (58), and attached at its other end to the second sealing ring (54).
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    同族专利:
    公开号 | 公开日
    CN102665852B|2014-10-22|
    EP2504075B1|2015-05-20|
    SE534239C2|2011-06-14|
    BR112012012764A2|2020-09-15|
    BR112012012764B1|2021-03-16|
    WO2011064443A1|2011-06-03|
    EP2504075A1|2012-10-03|
    CN102665852A|2012-09-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FR1071408A|1953-02-23|1954-08-31|Brassert & Company|Filtration installation intended, in particular, for the mechanical purification of waste water|
    US2894635A|1956-07-23|1959-07-14|Dorr Oliver Inc|Sealing means for rotary drum filters|
    US4821536A|1988-06-22|1989-04-18|Ingersoll-Rand Company|Rotating drum end seal|
    DE3837956A1|1988-11-09|1990-05-10|Fan Engineering Gmbh|Apparatus for lateral sealing of press rolls|
    SE524513C2|2002-12-20|2004-08-17|Metso Paper Inc|Sealing device for sealing between a shaft and a bearing housing as well as a device for dewatering and / or washing of material suspensions|
    SE532437C2|2007-09-19|2010-01-19|Andritz Oy|Drainage drum for dewatering cellulose pulp|CN104096404B|2014-07-29|2016-02-10|津伦（天津）精密机械股份有限公司|The filter element of the two-sided clamping filter screen of rotary drum filter|
    ES2666591B1|2016-11-02|2018-11-30|Rotecna, S.A.|PERFECTION IN THE MACHINES FOR PURINE TREATMENT|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE0950906A|SE534239C2|2009-11-27|2009-11-27|Device for sealing a press|SE0950906A| SE534239C2|2009-11-27|2009-11-27|Device for sealing a press|
    CN201080053466.8A| CN102665852B|2009-11-27|2010-11-15|Arrangement for sealing a press|
    EP20100788100| EP2504075B1|2009-11-27|2010-11-15|Arrangement for sealing a press|
    BR112012012764-0A| BR112012012764B1|2009-11-27|2010-11-15|sealing arrangement connectable to a press|
    PCT/FI2010/050915| WO2011064443A1|2009-11-27|2010-11-15|Arrangement for sealing a press|
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