• 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:
    The invention relates to a pressure sorter for sorting a pulp suspension (1) with a sieve element (11) which is rotationally symmetrical about a Siebachse (10) and divides the pressure sorter into an inlet space (12) and an accepts space (13), wherein the inlet space (12) with a suspension feed (14) and a Rejektauslauf (15) and the Acceptance space (13) with a Gutstoffablauf (16) is in communication and in Zulaufraum (12) is a drum-like rotor (2) with rotor blades (3, whose axis of rotation (17 ) of the Siebachse (10) and which rotates relative to the sieve element (11), whereby the rotor vanes (3) are distributed over a plurality of circumferential planes (18) of the rotor (2) perpendicular to the rotation axis (17) the sorting efficiency can be reduced by the fact that in the direction of rotation (7) extending cross section of the rotor blades (3) has a rounded, in the direction of rotation (7) facing Fl gel tip (4), an opposite to the direction of rotation (7) subsequent wing center part (5) parallel to each other and the Roatationsrichtung (7) extending wing side surfaces (9) and a Flügelendteil (6), wherein the height of the wing tip (4) and the Wing center part (5) in the outer edge region (8) of the rotor blade (3) is the largest and decreases towards the center.
    公开号:AT15802U1
    申请号:TGM9007/2016U
    申请日:2016-06-02
    公开日:2018-07-15
    发明作者:
    申请人:Voith Patent Gmbh；
    IPC主号:
    专利说明:

    description
    PRESSURE GRADER
    The invention relates to a pressure sorter for sorting a pulp suspension with a Siebachse rotationally symmetrical trained sieve element which divides the pressure sorter into a Zulaufraum and a Gutstoffraum, wherein the Zulaufraum with a suspension inlet and a Rejektauslauf and Acceptance space with a Gutstoffablauf is in communication and in the Zulaufraum a drum-like rotor with rotor blades, whose axis of rotation of the Siebachse corresponds and which rotates relative to the screen element, wherein the rotor blades are arranged distributed over a plurality of perpendicular to the axis of rotation circumferential planes of the rotor.
    Pressure sorters are used in the preparation of paper pulp suspensions, to process the pulp suspension in a wet sieving. For this purpose, such a pressure sorter includes a sieve element which is provided with a plurality of openings. The fibers contained in the suspension are to pass through the openings as accept, while the unwanted solid constituents are rejected thereon and discharged as a reject again from the sorter.
    It is also conceivable use for the separation of different fiber components, so the shorter of the longer fibers.
    As sorting holes round holes or slots are used in the rule. In most cases, pressure sorters of the type considered here are provided with screen scrapers having reaming surfaces moved past the screen. As a result, clogging of the screen openings is prevented in a manner known per se.
    From WO 98/53135 a Siebräumer has become known, which is provided with wing elements for the clearance of the screen These wing elements have a hydrodynamic profile, which extends over the entire length of the screen element, a screen basket. Due to the relative movement to the surrounding suspension, the wing element releases a pressure at the front and a suction pulse behind it onto the sieve to be cleared. Thereby, a part of the suspension, which was rejected on the screen or has already passed through the screen as accepts, sucked back, whereby the screen openings are kept free or cleared.
    In contrast, the rotor blades are formed for example in DE-OS 3701669 of surveys.
    A disadvantage of the known pressure graders emanating from the pressure and suction pulses, relatively strong pulsations.
    The object of the invention is therefore to minimize the strength of the pulsations with the highest possible sorting efficiency.
    According to the invention the object has been achieved in that the running in the direction of rotation cross-section, i. the radially oriented cross-sectional area of the rotor blades comprises a rounded blade tip pointing in the direction of rotation, a blade center portion parallel to and parallel to the direction of rotation, and a blade end portion, wherein the height of the blade tip and the blade center portion in the outer edge region of the rotor blade relative to the cylindrical rotor surface area is greatest and decreases from the edge region towards the center of the rotor blade.
    The high altitude in the outer edge region leads to an increased flow of the pulp suspension and favors the expression of the differential pressure between wing tip and wing end.
    In conjunction with the decreasing height of the center of the rotor blade as a slow degradation of the pressure pulse is possible.
    A particularly streamlined shape results when the running in the direction of rotation cross-sectional area of the wing tip is formed parabolic.
    For the gentle assembly and disassembly of the pressure pulse, it is advantageous if the height of the outer edge region at the wing tip and preferably also the middle wing part is equal and / or the height of the wing tip and the wing center part to the outer edge region towards the center decreases continuously in a transition region.
    In order for the rotor blades to have the greatest possible effect, in particular suction, the distance between the edge region and the sieve element should be as small as possible. However, there is a risk of jamming if the distance is too short.
    By extensive experiments, it has been found to be optimal when the minimum distance between the edge region of the rotor blades and the screen element is between 3 and 15 mm.
    With regard to the use of the pressure sorting one generally distinguishes between the fine sorting / fine cleaning and the coarse sorting / rough cleaning and the thick matter or the reject sorting.
    When fine sorting is concerned with the removal of fine impurities and stickies at a consistency of the pulp suspension between 0.8 and 2.5%, the screen openings of the screen element are usually formed as slots.
    In contrast, the removal of impurities and stickies at a consistency of the pulp suspension between 2.0 and 5% is sought in the coarse sorting and the thick matter or the Committee sorting. The screen openings can be formed both as holes, as well as designed with slots.
    Because of the relatively low consistency, it is in the fine sorting of Faserstoffsus-pension in order to intensify the rotor effect advantageous if the minimum distance between the edge region of the rotor blades and the sieve between 3 and 7 mm and / or the rotational speed of the rotor between 13 and 20 m / s.
    In order to achieve an optimal suction effect starting from the rotor blades at the relatively high consistency of the pulp suspension during the coarse sorting or the sludge sorting or reject sorting, the minimum distance between the edge region of the rotor blades and the sieve element should be between 7 and 15 mm and / or the rotational speed of the rotor between 16 and 25 m / s are.
    When used in the wood pulp and pulp area for making paper, the sorters have a fabric density range between 1 and 5% and a minimum gap between the edge area of the rotor blades and the screen between 3-15 mm. The small gap widths of 3 to 7 mm are preferably used at low substance densities between 1 and 2.5% and the larger gap widths of 7 to 15 mm at higher substance densities between 2.0 and 5%.
    With regard to the effect on the formation of the differential pressure, it is advantageous that the width of the outer edge region preferably decreases continuously from the wing tip to the wing end part.
    In the interest of a gradual reduction of the pressure pulse, the height of the wing tip should preferably decrease continuously, contrary to the direction of rotation. It is also advantageous if the wing side surfaces of the Flügelendteils parallel to each other and parallel to the direction of rotation.
    In sum, the rotor blades can thus be designed to be much shorter than usual in the direction of rotation, which extends the possibilities of their arrangement on the rotor.
    To avoid turbulence, the wing side surfaces of the wing end should be rounded. In addition, the Flügelendteil should have a perpendicular to the direction of rotation end side.
    In order to even out the effect of the rotor blades and in particular the turbulence emanating from them, it is advantageous if the rotor blades of adjacent circumferential planes are arranged offset from one another in the direction of rotation.
    In order to achieve a transverse flow in the axial direction over the screen element, the axis of rotation should be inclined or perpendicular to the machine plane.
    Advantages in terms of design and function of the pressure sorter arise further when the rotor is within the screen element, the screen element is cylindrical and the rotor are formed as a cylindrical drum.
    The invention will be explained in more detail with reference to an exemplary embodiment. In the attached drawing: FIG. 1 shows a schematic cross-section through a pressure sorter parallel to FIG
    Rotation axis 17; Figure 2: a plan view of a rotor blade 3; Figure 3: a perspective view of the rotor blade 3 and Figure 4: a perpendicular to the axis of rotation 17 extending cross-section through the
    Rotor blades 3.
    In Figure 1 can be seen a pressure sorter according to the invention with a sieve 11, here in the form of a cylindrical screen basket with vertical Siebachse 10, which divides the interior of the pressure sorter in an inlet space 12 and an accepts space 13.
    In the inlet chamber 12, the pulp suspension 1 is fed via a suspension feed 14.
    In the pressure sorter used here, the pulp suspension 1 receives an angular momentum which causes it to move circumferentially. In addition to this, a transport flow is generated as a result of the applied pressure gradient between the above drawn suspension inlet 14 and the underlying Rejektauslauf 15 of the feed chamber 12.
    On the way of this transport flow, a large part of the pulp suspension 1 is intended derived by the sieve 11 as Acceptance 20 in the Acceptance space 13 and discharged from there via the Gutstoffablauf 16. At the same time, at least a large part of the fibers contained in the pulp suspension 1 also passes into the accept chamber 13.
    The rejected from the screen element 11 part of the pulp suspension 1 is conveyed as a reject 21 via the Rejektauslauf 15 from the feed chamber 12.
    In order to prevent the openings of the screen element 11 are clogged, a known Siebräumer is used, which moves relative to the screen element 11.
    According to the invention this Siebräumer is formed by a rotating in the screen element 11 rotor 2 with rotor blades 3 attached thereto. In this case, the rotor 2 has the shape of a cylindrical drum, wherein the axis of rotation 17 coincides with the Siebachse 10.
    All rotor blades 3 in this case according to Figures 2 to 4 have the same shape, which leads to a uniform effect on the pulp suspension 1 and the filter element 11.
    In addition, the rotor blades 3 are arranged distributed over a plurality of perpendicular to the rotation axis 17 extending circumferential planes 18 of the rotor 2. However, it is essential that a plurality of rotor blades 3 are arranged in a circumferential plane 18 and the rotor blades 3 completely cover one another in a circumferential plane 18 in the direction of rotation 7.
    In order to equalize their effect, the rotor blades 3 adjacent circumferential planes 18 are arranged offset in the direction of rotation 7 to each other.
    In addition, the rotor blades 3 in this case not only the same shape but also the same dimensions, which reduces the manufacturing cost.
    In order to reduce flow losses and promote differential pressure formation, the cross-section of the rotor blades 3 running in the direction of rotation 7 has a rounded, parabolic blade tip 4 facing in the direction of rotation 7, a blade center member 5 adjoining the rotation direction 7 with parallel to each other and parallel to the direction of rotation 7 extending wing side surfaces 9 and a Flügelendteil 6, wherein the height of the wing tip 4 and the wing center part 5 in the outer edge region 8 of the rotor blade 3 is greatest and decreases from the edge region 8 toward the center.
    The wing tip 4 clears the pulp suspension 1 aside, on the parallel wing side surfaces 9, the flow velocity and the differential pressure is increased and in the subsequent area with reduced height, the return flow through the sieve 11 favors.
    Here, the height of the outer edge region 8 at wing tip 4 and wing middle part 5 is the same size, which supports the formation of the differential pressure and the use of much shorter rotor blades 3 than usual allowed.
    When designing the pressure sorter for fine sorting of the pulp suspension 1, the minimum distance 23 between the edge region 8 of the rotor blades 3 and the screen element 11 is between 3 and 7 mm and / or the rotational speed of the rotor 2 between 13 and 20 m / s.
    If the pressure sorters are used for coarse sorting or sludge sorting or reject sorting of the pulp suspension 1, then the minimum distance 23 between the edge region 8 of the rotor blades 3 and the screen element 11 is between 7 and 15 mm and / or the rotational speed of the rotor 2 between 16 and 25 m / s.
    In order to reduce the pressure slowly again and thus to minimize pulsations, the height of the wing tip 4 and of the wing center part 5 decreases continuously towards the middle in a transition region towards the outer edge region 8.
    For the same reason, the width of the outer edge region 8 from the wing tip 4 to the Flügelendteil 6 out and the height of the Flügelendteils 6 against the direction of rotation 7 continuously decrease.
    The extending between the edge region 8 and the transition region edge 22 is curved, thus supporting the gentle introduction of the return flow.
    Figures 2 and 3 indicate that the course of this edge 22 may be adapted to the specific conditions of use and, for example, extends only in the wing center part 5.
    To minimize turbulence, the wing side surfaces 9 of the wing end 6 are rounded in the direction perpendicular to the direction of rotation 7 extending cross-section.
    Furthermore, the wing side surfaces 9 of the wing end 6 extend parallel to each other and parallel to the direction of rotation 7. Here, the wing end 6 has a perpendicular to the direction of rotation 7 extending end side 19. This also supports the slow degradation of the pressure pulse.
    权利要求:
    Claims (15)
    [1]
    claims
    1. pressure sorter for sorting a pulp suspension (1) with a sieve (10) rotationally symmetrical trained sieve element (11) which divides the pressure sorter into an inlet space (12) and an accepts space (13), wherein the inlet space (12) with a Suspension inlet (14) and a Rejektauslauf (15) and the Acceptance space (13) with a Gutstoffablauf (16) is in communication and in Zulaufraum (12) is a drum-like rotor (2) with rotor blades (3), the axis of rotation (17) the Siebachse (10) corresponds and which rotates relative to the screen element (11), wherein the rotor blades (3) over a plurality of perpendicular to the rotation axis (17) extending peripheral planes (18) of the rotor (2) are arranged distributed, characterized in that in Direction of rotation (7) extending cross-section of the rotor blades (3) a rounded, in the direction of rotation (7) pointing blade tip (4), a counter to the rotation direction (7) subsequent wing center part (5) with wing side surfaces (9) extending parallel to one another and parallel to the direction of rotation (7) and a wing end part (6), wherein the height of the wing tip (4) and the wing center part (5) in the outer edge region (8) of the rotor blade (3) greatest is and decreases from the edge region (8) towards the center.
    [2]
    2. pressure sorter according to claim 1, characterized in that the wing tip (4) is formed parabolic.
    [3]
    3. pressure sorter according to claim 1 or 2, characterized in that the height of the outer edge region (8) at the wing tip (4) and preferably also the wing center part (5) is the same.
    [4]
    4. Pressure sorter according to one of the preceding claims, characterized in that the minimum distance (23) between the edge region (8) of the rotor blade (3) and the sieve element (11) is between 3 and 15 mm.
    [5]
    5. pressure sorter according to claim 4, characterized in that for fine sorting of the pulp suspension (1) the minimum distance (23) between the edge region (8) of the rotor blades (3) and the sieve element (11) is between 3 and 7 mm.
    [6]
    6. pressure sorter according to one of the preceding claims, characterized in that for the fine sorting of the pulp suspension (1), the rotational speed of the rotor (2) is between 13 and 20 m / s.
    [7]
    7. pressure sorter according to claim 4, characterized in that for coarse sorting or for thick matter or for reject sorting of the pulp suspension (1) the minimum distance (23) between the edge region (8) of the rotor blades (3) and the sieve element (11) between and 15 mm.
    [8]
    8. pressure sorter according to one of the preceding claims, characterized in that for the coarse sorting or for thick matter or for reject sorting of the pulp suspension (1), the rotational speed of the rotor (2) between 16 and 25 m / s.
    [9]
    9. pressure sorter according to any one of the preceding claims, characterized in that the height of the wing tip (4) and the wing center part (5) after the outer edge region (8) toward the center decreases continuously in a transition region.
    [10]
    10. Pressure sorter according to one of the preceding claims, characterized in that the width of the outer edge region (8) preferably decreases continuously from the wing tip (4) to the wing end part (6).
    [11]
    11. Pressure sorter according to one of the preceding claims, characterized in that the fleas of the wing end portion (6) against the direction of rotation (7) preferably decreases continuously.
    [12]
    12. pressure sorter according to one of the preceding claims, characterized in that the wing side surfaces (9) of the Flügelendteils (6) parallel to each other and parallel to the rotational direction (7).
    [13]
    13. pressure sorter according to claim 12, characterized in that the wing side surfaces (9) of the wing end part (6) are rounded.
    [14]
    14. Pressure sorter according to one of the preceding claims, characterized in that the wing end part (6) has a perpendicular to the direction of rotation (7) extending end side (19).
    [15]
    15. Pressure sorter according to one of the preceding claims, characterized in that the rotor blades (3) adjacent circumferential planes (18) in the rotational direction (7) are arranged offset from one another. For this 1 sheet drawings
    类似技术:
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    同族专利:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    FI92227C|1992-04-23|1994-10-10|Ahlstroem Oy|Apparatus for processing the fiber suspension|
    US5497886A|1992-07-13|1996-03-12|Ingersoll-Rand Company|Screening apparatus for papermaking pulp|
    US5307939A|1992-07-13|1994-05-03|Ingersoll-Rand Company|Screening apparatus for papermaking pulp|JP2021038490A|2019-09-04|2021-03-11|フォイト パテント ゲゼルシャフト ミット ベシュレンクテル ハフツングＶＯＩＴＨ ＰＡＴＥＮＴ ＧｍｂＨ|Screen device and rotor for screen device|
    CN111364274A|2020-04-30|2020-07-03|郑州磊展科技造纸机械有限公司|Novel pressure screen|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102015210252|2015-06-03|
    PCT/EP2016/062480|WO2016193364A1|2015-06-03|2016-06-02|Pressure screen|
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