Conical refiner filler, refiner and method of use
By introducing recirculation flow and conical stator grinding filler into the conical finish mill, the problem of high pressure control difficulty and increased cost and energy consumption in the conical finish mill is solved, and the improvement of pressure control and the reduction of production costs are achieved.
Patent Information
- Application Number
- CN202411714462.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-11-27
- Filing Date
- 2024-11-27
- Publication Date
- 2025-05-27
AI Technical Summary
In the prior art, when the conical fine mill is refined, the pressure control is difficult to control when polishing fiber materials, resulting in an increase in pressure, and the recirculation system increases production cost and energy consumption.
At least one recirculation flow is introduced in the conical finish mill, recirculating the fiber material from the finish mill chamber back to the finish mill gap, reducing pressure accumulation, and by design of the conical stator recirculation flow to adjust the pressure.
It effectively reduces the pressure increase in the finishing mill, reduces the demand for additional pipes and control devices, reduces production costs and energy consumption, and improves the controllability of the finishing mill system.
Smart Images
Figure CN120042085A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a conical refiner for refining fibrous materials, and more particularly to a conical refining filling for a conical refiner for refining fibrous materials. Background Art
[0002] A conical refiner for refining fibrous materials, where the fibrous material, i.e., the pulp suspension or pulp, is a mixture containing at least water and virgin fibrous material and / or recycled fibrous material. The conical refiner typically includes two conical refining elements arranged opposite to each other, so that there is a refining gap between them and they can rotate relative to each other, i.e., one or both are rotating. The refining elements include refining surfaces, and refining bars and refining grooves are provided between the refining surfaces. The refining bars are used for defibring and refining the fibrous material to be refined, and the refining grooves are used for conveying the material to be refined forward along the refining surfaces.
[0003] The efficient manufacture of paper and cardboard has led to a trend of increasing production line output. From the perspective of refining, this generally means an increase in the size and / or number of refiners applied. Figure 1 There is schematically disclosed a prior art refining system having three conical refiners 1, 2, 3 connected in series with each other.
[0004] Figure 1 The problem of the prior art refining system is the controllability of the refining system, such as the pressure control of the refining system. During the operation of the refining system, each individual refiner 1, 2, 3 will cause an increase in pressure in the refining system. For smaller refiners, the pressure increase per refiner is about 1 to 1.5 bar, but for larger refiners (e.g., having a diameter of about 1 meter at the larger end of the refiner), it is even up to 2 to 2.5 bar per refiner. Since, in view of the durability of the refiner structure, the maximum pressure typically allowed in the refining system is about 6 to 7 bar, additional measures may be required to control the pressure in the refining system.
[0005] A possible additional measure for refining system pressure control is a recirculation system, such as the recirculation line 4 in Figure 1 for recirculating at least part of the already refined material back to the refiners connected in series for re-refining. However, a problem with the recirculation system is that the cost of the refining system increases due to the additional pipes, flow control devices, and instruments required for controlling the recirculation. Another problem with the recirculation system is that the energy used per ton of the refined fibrous material produced also increases, and the higher the proportion of the recirculated fibrous material in the total amount of fibrous material to be refined, the higher the energy used for refining. Summary of the Invention
[0006] One object of the present invention is to provide a novel conical refining filling member for a conical refiner for refining fibrous materials, and a new method for refining fibrous materials.
[0007] The present invention has the features disclosed below.
[0008] The present invention is based on the idea of arranging at least one recirculation flow inside the conical refiner, which is used to recirculate at least one fibrous material flow from the refiner chamber of the refiner back to the refining gap of the refiner.
[0009] One advantage of the present invention is that it reduces the pressure increase in the refiner, because the recirculation flow of the fibrous material from the refiner chamber back to the refining gap reduces the pressure accumulation in the refiner, that is, limits the pressure generated by the refiner, thereby eliminating the excessive pressure at the outlet of the refiner. The reduction of pressure accumulation in a single refiner provides the possibility of arranging more refiners in series without exceeding the maximum allowable pressure in the refining system, that is, allowing multiple refiners to operate without generating excessive pressure.
[0010] Some embodiments of the present invention are disclosed below. Description of the Drawings
[0011] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings through preferred embodiments, in which
[0012] Figure 1 a refining system of the prior art is schematically shown;
[0013] Figure 2 is a schematic side view of a partial cross-section of a conical refiner;
[0014] Figure 3 is a schematic cross-sectional side view of a conical stator refining filling member, which is intended to form at least a part of the conical refiner stator;
[0015] Figure 4 is a schematic front view of a conical stator refining filling member, which is intended to form at least a part of the conical refiner stator; and
[0016] Figure 5a and 5b schematically shows the hydraulic capacity of the refiner during commissioning; and
[0017] Figure 6 schematically shows another conical stator refining filling member, which is intended to form at least a part of the conical refiner stator.
[0018] For clarity, the drawings illustrate some embodiments of the present invention in a simplified manner. The same reference numerals denote the same elements in the figures. Detailed Description
[0019] Figure 2 A side view schematically shows a partial cross-section of a conical refiner 10. The refiner 10 can be used to refine fibrous materials, such as wood materials containing lignocellulose or other fibrous materials suitable for manufacturing paper or cardboard. The fibrous material is fed into the refiner 10 in the form of a pulp suspension (i.e., pulp), which is a mixture containing at least water and virgin fibrous material and / or recycled fibrous material and possibly some additives. The consistency of the fibrous material to be refined is typically between 2 - 6%.
[0020] Figure 2 The refiner 10 in includes a main frame 20, a refiner chamber 30 supported on the main frame 20, a feed end frame 40 supported on the refiner chamber 30, a fixed refiner element 50 (i.e., stator 50), a rotatable refiner element 60 (i.e., rotor 60), and a shaft 70 connected to the rotor 60 for rotating the rotor 60. The shaft 70 is supported on the main frame 20 by at least suitable bearings (not shown). The stator 50 and the rotor 60 are arranged at least partially opposite to each other such that the rotor 60 is at least partially located inside the stator 50, i.e., the stator 50 at least partially surrounds the rotor 60. Thus, in Figure 2 the refiner 10, the stator 50 forms an external refining element, and the rotor 60 forms an internal refining element arranged inside the stator 50. There is a small free distance between the stator 50 and the rotor 60, i.e., a refining gap 12 or a refining zone 12. The fibrous material is refined in the refining gap 12, i.e., when the refiner 10 is operating and the rotor 60 rotates relative to the stator 50, the fibrous material is subjected to a refining action in the refining gap 12.
[0021] The stator 50 includes a conical refining insert 80. The conical stator refining insert 80, i.e., the conical fixed refining insert 80, is a solid one-piece element configured to form at least a part of the stator 50 and is intended to exert a refining action on the fibrous material to be refined by itself. Figure 2 and Figure 3 shows a schematic cross-sectional side view of the conical stator refining insert 80 according to the disclosed solution. Figure 4 is a schematic front view of the conical stator refining insert 80, which is intended to form at least a part of the conical stator refiner element in a conical refiner.
[0022] The tapered stator finishing insert 80 according to the disclosed solution is discussed in more detail below. Generally, the stator finishing insert 80 has a longitudinal direction LD and a circumferential direction CD, and has a first end 80a with a smaller diameter and a second end 80b with a larger diameter in the longitudinal direction LD. The stator finishing insert 80 has an inner circumference 80IC facing the rotor 60. The inner circumference 80IC of the stator finishing insert 80 includes a finishing surface 82, and the finishing surface 82 is provided with finishing bars 84 and finishing grooves 86 between the finishing bars 84. The finishing bars 84 are used to dissociate and finish the fiber material to be finished, and the finishing grooves 86 are used to convey the material to be finished forward along the finishing surface 82. In addition, the stator finishing insert 80 has an outer circumference 80OC, which is facing away from the rotor 60, that is, towards the feed end frame 40. The stator finishing insert 80 can be supported, for example, in the finishing machine chamber 30 and / or the feed end frame 40.
[0023] The rotor 60 includes a frame 62 (also referred to as a hub 62) and a tapered rotor finishing insert 90 supported on the hub 62 of the rotor 60, that is, a tapered rotatable finishing insert 90. The tapered rotor finishing insert 90 is also a solid one-piece element, which is configured to form a part of the rotor 60 and is intended to cause itself to have a finishing effect on the fiber material to be finished.
[0024] The rotor finishing insert 90 also has a longitudinal direction and a circumferential direction similar to the structure of the stator finishing insert 80, and has a first end 90a with a smaller diameter and a second end 90b with a larger diameter in the longitudinal direction. The rotor finishing insert 90 has an inner circumference 90IC facing the hub 62 of the rotor 60 and an outer circumference 90OC facing the stator 50. The outer circumference 90OC of the rotor finishing insert 90 includes a finishing surface 92, which has finishing bars and finishing grooves between the finishing bars.
[0025] The rotor 60 is connected to a drive motor (not shown) by a shaft 70, so that the rotor 60 can rotate relative to the stator 50 in a desired rotational direction. The finishing machine 10 typically also includes a loading device (not shown), and the loading device can be used to move the rotor 60 attached to the shaft 70 back and forth in the longitudinal direction of the rotor 60 to adjust the size of the finishing gap 12 between the stator 50 and the rotor 60.
[0026] The fibrous material is fed into the refiner 10 through the inlet 14 in the manner schematically shown by the arrow IF, i.e., into the refining gap 12 therein. The inlet 14 and the volume between the inlet 14 and the refining gap 12 form the feed point or feed section of the refiner 10 for supplying the fibrous material to be refined into the refining gap 12. The fibrous material flows through the refining gap 12, as schematically shown by the arrow F. When the rotor 60 rotates relative to the stator 50, the refining action is affected by the fibrous material in the refining gap 12. The refined fibrous material flows out of the refiner 10 through the outlet 16 in the manner schematically shown by the arrow OF. The general construction and operation of a conical refiner are generally well-known to those skilled in the art and will not be discussed in detail here.
[0027] As described in the background art section of the above text, during the operation of a conical refiner, the pressure in the refining system increases. This pressure increase is caused by each or multiple refiners that form at least part of the refining system. In a conical refiner, one reason for the pressure increase is the geometry of the conical refiner, i.e., the increase in the diameters of the stator and the rotor. When the diameters of the stator and the rotor increase from their first ends to their second ends, the centrifugal force guiding the material to be refined in the refining gap increases towards the second ends of the stator and the rotor, resulting in an increase in pressure towards the second ends of the stator and the rotor. The amount of this pressure increase depends on, for example, the steepness of the conical geometry of the stator and the rotor. The second reason for the pressure increase is the rotational speed of the rotor, i.e., the higher the rotational speed of the rotor, the greater the pressure increase in the refiner. The third reason for the pressure increase is the geometry of the refining surfaces in the stator and the rotor, i.e., the geometry of the refining bars and refining grooves in the stator and the rotor. In a typical refiner configuration, the geometry of the refining bars and refining grooves is designed such that the refining bars and refining grooves promote the flow of the fibrous material to be refined towards the second ends of the stator and the rotor, that is, the refining bars and refining grooves are designed to pump the fibrous material to be refined to the second ends of the stator and the rotor. This further increases the pressure increase towards the second ends of the stator and the rotor. At least these reasons result in a pressure increase in the conical refiner from the refiner inlet to the refiner outlet. In smaller refiners, the pressure increase for each refiner may be about 1 to 1.5 bar, but for larger refiners, such as refiners with a larger end diameter of the stator / rotor of about 1 meter, the pressure increase for each refiner may even be as high as 2 to 2.5 bar. Since the maximum allowable pressure in the refining system is about 6 to 7 bar, additional measures may be required to control the pressure of the refining system, especially in the case of two or more refiners connected in series.
[0028] Figure 2 An embodiment is further disclosed to solve the problem of pressure increase in a single refiner, thus solving the problem of pressure rise in a refining system composed of two or more refiners connected in series with each other. According to the embodiment, Figure 2The refiner 10 is arranged to provide at least one recirculation flow of the fibrous material to be refined between the refiner chamber 30 and the first end 12a of the refiner gap 12, so as to recirculate at least one fibrous material flow from the refiner chamber 30 back into the refiner gap 12. This means that a part of the fibrous material flow that passes through the refining gap 12 and enters the refiner chamber 30 (i.e., has been refined at least once when flowing through the refining gap 12) will flow back to the first end 12a of the refining gap 12, where it mixes with the new fibrous material flow flowing into the refiner 10 through the inlet 14 before entering the refining gap 12 again. Figure 2 The recirculation flow of the fibrous material flowing back from the refiner chamber 30 to the refiner gap 12 is schematically shown by the arrow RF in FIG.
[0029] Figure 2 Further in conjunction with Figure 3 and Figure 4 and the related description below discloses an embodiment for arranging at least one recirculation flow RF between the refiner chamber 30 and the first end 12a of the refining gap 12 in the refiner 10. According to the embodiment, the conical stator refining filling member 80 includes at least one flange 110 on its outer periphery 80OC, and the flange 110 projects from the outer periphery 80OC of the refining filling member 80 and extends on the outer periphery 80OC of the refining filling member 80 in the circumferential direction CD of the refining filling member 80. The flange 110 includes a first side surface 110a that at least partially faces the first end 80a of the refining filling member 80, a second side surface 110b that at least partially faces the second end 80b of the refining filling material 80, and an opening portion. In Figures 2 to 4 the embodiment of FIG., the hole 120 extends through the flange 110 between the first side surface 110a and the second side surface 110b of the flange 110.
[0030] In cooperation with introducing at least one opening portion (such as the hole 120) through the flange 110, the refiner 10 is arranged to form at least one recirculation flow RF flowing from the refiner chamber 30 to the first end 12a of the refining gap 12, or in other words, flowing from the refiner chamber 30 to the feed inlet of the refiner, for recirculating at least one recirculation flow RF of the fibrous material from the refiner chamber 30 back to the refining gap 12 along the outer periphery of the conical stator refining filling member 80.
[0031] One effect of the disclosed solution is to reduce the pressure increase in the refiner, because the recirculation flow of the fibrous material flowing back from the refiner chamber to the refining gap reduces the pressure accumulation in the refiner, thereby eliminating the excessive pressure at the outlet of the refiner. The reduction of pressure accumulation in a single refiner makes it possible to arrange a larger number of refiners in series without exceeding the maximum allowable pressure of the refining system.
[0032] The disclosed solution provides a self - balancing or self - regulating solution for pressure control and fiber material recirculation in a refiner, such that the higher the accumulation of the flow pressure in the refiner, the higher the proportion of the fiber material recirculation flow in the total flow of the fiber material to be refined in the refiner, thereby effectively reducing the pressure increase in the refiner. The size and number of the opening parts, such as the size and number of holes 120, can be changed to adjust the pressure accumulation level in the refiner and the recirculation flow of the fiber material to be refined. According to an example of the conical refining filling piece 80 for the stator 50, the diameter of the larger end of the refining filling piece 80 can be, for example, 460 mm to 1 m, the outer diameter of the flange 110 can be, for example, 500 mm to 1100 mm, and the diameter of the hole 120 can be, for example, 30 mm of any shape. The larger the refiner, the larger the holes.
[0033] The disclosed solution eliminates the need for additional piping for recirculating the fiber material to be refined, as well as the need for flow control devices and instruments required for controlling the recirculation. This has a significant cost - reducing effect on refining systems that tandem two or more refiners, even reducing costs by tens of thousands of euros.
[0034] The disclosed solution also has the potential to provide a more heterogeneous refining, since a portion of the fiber material to be refined may be recirculated several times through one or more of at least two refiners in tandem. This may have a positive impact on certain properties of the refined fiber material, such as providing a higher tear index, as is typically expected for heterogeneous refined materials, but still has no significant impact on some other properties of the refined fiber, such as the drainage or tensile index of the refined fiber. This provides the possibility of designing different refining applications for various paper grades.
[0035] One effect is that the energy consumption per ton of the produced refined fiber material is also reduced, because recirculating the fiber material through an external piping system is avoided.
[0036] Figure 5a and 5b Some test results of the commissioning are schematically shown, in which the operation of the disclosed solution is compared with the operation of the prior - art solution in a refining system of a single refiner. The fiber material to be refined in the commissioning is bleached long - fiber kraft pulp. The cutting edge length of the refining filling piece in the refiner is 3.7 km per revolution, and the flange of the stator refining filling piece consists of 18 holes with a diameter of 20 mm.
[0037] Figure 5a The increase in pressure in the refiner is shown, which is a function of the forward flow of the fiber material to be refined in the refiner. Figure 5aThe lower diagram therein shows the pressure increase when the holes in the stator refining filling piece are open, that is, the recirculation flow of the fiber material from the refining machine chamber back to the refining machine feed has been enabled. Figure 5a The upper diagram therein shows the pressure increase when the holes in the stator refining filling piece are blocked, that is, the recirculation flow of the fiber material from the refining machine chamber back to the refining machine feed has been disabled. Therefore, Figure 5a The upper diagram shows the pressure increase that occurs in the prior art refiner under operating conditions. Figure 5a It shows that when the disclosed solution is applied, the pressure increase of a single refiner is significantly reduced.
[0038] Figure 5b It shows the relationship between the forward flow, recirculation flow and total flow of the fiber material to be refined in a single refiner and the forward flow. Figure 5b Together with Figure 5a It shows that the smaller the forward flow rate of the refiner, the higher the recirculation flow rate in the refiner, and the more significant the reduction in the refiner pressure increase.
[0039] Figure 5a And 5b It shows that the disclosed solution very effectively reduces the pressure accumulation that occurs in the refiner, which in turn provides a possibility, for example, to arrange a larger number of refiners in series without exceeding the maximum allowable pressure in the refiner system, that is, the solution allows multiple refiners to operate without generating excessive pressure, or the structure of the refiner can be optimized according to its service life. In addition, as a result of the disclosed solution, various different refining applications can be designed to produce various paper grades.
[0040] According to Figure 2 In the embodiment shown, the flange 110 protruding from the outer periphery 80OC of the refining filling piece 80 is arranged to extend from the outer periphery 80OC of the refining filling piece 80 to the refining machine chamber 30 and the feed end frame 40, so that the outer periphery of the flange 110 is arranged between the refining machine chamber 30 and the feed end frame 40. According to the embodiment, the flange 110 is arranged to form a support element to support the refining filling piece 80 in place at least in the longitudinal direction LD of the refining filling piece in the refiner 10, but in practice, the flange 110 can also form a support element to support the refining filling piece 80 in place in the diameter direction of the refining filling piece.
[0041] According to Figure 2 In the embodiment shown, there is only one flange 110, but if the convenience of supporting the stator refining filling piece 80 on the feed end frame 40 is considered, the number of flanges 110 can also be more than one.
[0042] In Figure 2In the illustrated embodiment, the flange 110 is arranged along the longitudinal direction LD of the lapped filling piece 80 and is closer to the second end 80b of the lapped filling piece 80 than to the first end 80a thereof. This has the effect that the extension of the flange 110 in the direction away from the outer periphery 80OC of the lapped filling piece 80 can be minimized, which increases the structural strength of the flange 110.
[0043] According to Figures 2 to 4 the illustrated embodiment, a hole 120, i.e., an orifice 120, which extends through the flange 110 between the first side 110a and the second side 110b of the flange 110, is arranged in the flange 110. The opening portion can be, for example, a groove extending from the outer periphery of the flange 110 towards the root of the flange 110 instead of the hole 120.
[0044] According to Figure 4 the illustrated embodiment, the holes 120 are arranged at the flange 110 at a standard distance from each other along the same circumferential line. This has the effect of providing substantially similar flow characteristics of the recirculation flow RF around the stator lapped filling piece 80. However, other placement manners of the holes 120 or other opening portions are also possible.
[0045] According to an embodiment, the hole 120 is arranged at the root of the flange 110, i.e., as close as possible to the bottom of the flange 110 without impairing the structural strength of the flange 110. This has the effect that the extension of the flange 110 in the direction perpendicular to the outer periphery 80OC of the lapped filling piece 80 can be minimized. This also has the effect that the recirculation flow RF of the fibrous material can be easily guided along the outer periphery 80OC of the lapped filling piece 80 without causing excessive turbulence when the recirculation flow RF flows through the opening portion in the flange 110, which may interfere with the effective flow of the recirculated fibrous material.
[0046] According to Figure 4 the illustrated embodiment, the cross-sectional shape of the hole 120 is circular, which is the most effective shape for a flow channel technically. However, other cross-sectional shapes of the hole 120 are also possible.
[0047] According to an embodiment, the flange 110 can be a component initially separated from the stator lapped filling piece 80, but is arranged at the outer periphery 80OC of the stator lapped filling piece 80, for example, by applying a shrink fit and / or welding between the flange 110 and the outer periphery 80OC of the stator lapped filling piece 80.
[0048] According to an embodiment, the stator lapped filling piece 80 having the flange 110 is a solid one-piece element, whereby the structure of the stator lapped filling piece 80 having the flange 110 is uniform, which may be advantageous considering the structural strength of the stator precision filling piece 80.
[0049] According to one embodiment, the stator lapping insert 80 with the flange 110 is a cast solid one-piece element, whereby the stator lapping insert 80 with the flange 110 and the holes 120 or other open portions therein is easy to manufacture. However, the stator lapping insert 80 can be manufactured in another way, such as by 3D printing, such that the stator lapping insert is a solid one-piece element.
[0050] In the embodiment disclosed above, the flange 110 forms a protruding portion on the outer periphery of the stator lapping insert 80, which protrudes from the outer periphery 80OC of the lapping insert 80 and extends at least partially on the outer periphery 80OC of the lapping insert 80 in at least a partial circumferential direction CD of the lapping insert 80, and the protruding portion includes a first side surface at least partially facing the first end 80a of the lapping insert 80, a second side surface at least partially facing the second end 80b of the lapping insert 80, and an opening portion (such as the hole 120) extending through the protruding portion between the first side surface and the second side surface of the protruding portion. Other types of protruding portions rather than the flange can also be applied on the outer periphery of the stator lapping insert 80 to provide the disclosed solution.
[0051] Figure 6 An embodiment of another conical stator lapping insert 80 is schematically shown in. Figure 6 The conical lapping insert 80 in is otherwise similar to Figure 3 and Figure 4 shown, but Figure 3 and 4 the flange 110 shown in is replaced by a plurality of wings 115 that protrude from the outer periphery 80OC of the lapping insert and have a first side surface 115a at least partially facing the first end 80a of the lapping insert 80 and a second side surface 115b at least partially facing the second end 80b of the lapping insert 80.
[0052] Each wing 115 has a limited length in the circumferential direction CD of the lapping insert 80. Therefore, each wing 115 only extends at least partially on the outer periphery 80OC of the lapping insert 80 in the circumferential direction CD of the lapping insert 80, such that there is an opening portion in the form of a free space 125 between adjacent wings 115, and the opening portion extends over the wings 115 on the outer periphery 80OC of the lapping insert 80. Therefore, the recirculation flow RF flowing from the lapping machine chamber 30 to the lapping machine feed can flow through the free space 125 and past the wings, so that at least one recirculation flow RF of the fibrous material is recirculated from the lapping machine chamber 30 back to the lapping gap 12 along the outer periphery of the conical stator lapping insert 80.
[0053] According to Figure 6In an embodiment not shown, the wing 115 may further include an opening portion having the form of a hole 120 or an orifice extending through the wing 115 between the first side surface 115a and the second side surface 115b of the wing 115. Such an embodiment provides the possibility of designing more different combinations of protrusions and opening portions in view of the implementation of the recirculation flow RF and the structural durability of the finishing insert 80.
[0054] Figure 2 , 3 , 4 and 6 disclose some embodiments of the tapered finishing insert 80 for implementing the disclosed solution. Generally, the tapered finishing insert 80 for implementing the disclosed solution includes a first end 80a with a smaller diameter and a second end 80b with a larger diameter, an inner circumference 80IC, an outer circumference 80OC, and at least one protrusion 110, 115. The inner circumference 80IC includes a finishing surface 82 provided with finishing strips 84 and finishing grooves 86. The protrusions 110, 115 protrude away from the outer circumference 80OC and extend at least partially on the outer circumference 80c in at least a partial circumferential direction CD of the finishing insert 80, and at least one opening portion extending through or passing through at least one protrusion 110, 115.
[0055] According to the disclosed solution, the protrusion 110 may thus also be a flange extending on the outer circumference 80OC of the tapered finishing insert 80, but includes at least one recess or groove that provides at least one opening portion extending from the outer circumference of the flange to the groove of the flange and possibly even to the outer circumference 80OC of the tapered finishing insert 80, such that at least one recirculation flow RF can flow through the flange.
[0056] Furthermore, in the above-disclosed solution, the stator finishing insert 80 has the disclosed protrusions and opening portions passing through or located therebetween, but a similar type of finishing filling structure can also be applied to the rotor to provide at least one recirculation flow RF in the finisher 10. Therefore, the features of the above stator finishing insert 80 can be applied to the finishing insert 90 applied to the rotor where applicable.
[0057] It will be obvious to those skilled in the art that, as technology progresses, the inventive concept can be implemented in various ways. The present invention and its embodiments are not limited to the above examples but can vary within the scope of the claims.
Claims
1. A conical refining filler (80) for a refiner (10) for refining fiber material, the refining filler (80) comprising: A first end (80a) with a smaller diameter and a second end (80b) with a larger diameter, an inner periphery (80IC) including a refining surface (82) provided with refining strips (84) and refining grooves (86), and an outer periphery (800C) and at least one protruding portion (110, 115) at the outer periphery (800C), the at least one protruding portion (110, 115) protruding away from the outer periphery (800C) and extending at least partially on the outer periphery (800C) in at least a portion of a circumferential direction (CD) of the fine grinding filler (80), and At least one opening portion extends through or past the at least one protruding portion (110, 115).
2. The conical fine grinding filler according to claim 1, characterized in that: The protruding portion is a flange (110), which protrudes from the outer periphery (800C) and extends on the outer periphery (800C) in at least a portion of the circumferential direction (CD) of the fine grinding filler (80), wherein the flange (110) includes a first side surface (110a) at least partially facing the first end (80a) of the fine grinding filler (80) and a second side surface (110b) partially facing the second end (80b) of the fine grinding filler (80), and there is at least one opening portion extending through the flange (110) between the first side surface (110a) and the second side surface (110b) of the flange (110).
3. The conical fine grinding filler according to claim 1, characterized in that: The protruding portion is a wing (115) protruding from the outer periphery (800C) and has a limited length extending partially on the outer periphery (80c) in at least a portion of the circumferential direction (CD) of the fine grinding filler (80), and there are at least two wings (115) on the outer periphery (80) of the fine grinding filler, and at least two opening portions extend through the wings (115) on the outer periphery (800C) of the fine grinding filler (80).
4. A conical fine grinding filler according to any one of the preceding claims, characterized in that The opening portion extending through the protruding portion (110, 115) is a hole (120) extending between a first side (110a, 115a) and a second side (110b, 115b) of the protruding portion (110, 115).
5. The conical fine grinding filler according to any one of claims 1, 3 or 4, characterized in that: The opening portion is a free space (125) in the protruding portions (110, 115) or between adjacent protruding portions (115).
6. The conical fine grinding filler according to claim 4 or 5, characterized in that: The hole (120) is provided at the root of the protruding portion.
7. The conical fine grinding filler according to any one of claims 4 to 6, characterized in that: The hole (120) is circular.
8. A conical fine grinding filler according to any one of the preceding claims, characterized in that The fine grinding filler (80) has a longitudinal direction (LD) extending between the first end (80a) and the second end (80b) of the fine grinding filler (80), and the at least one protrusion (110, 115) is arranged in the longitudinal direction (LD) of the fine grinding filler (80) at a position closer to the second end (80b) of the fine grinding filler (80) than to the first end (80a) of the fine grinding filler (80).
9. A conical fine grinding filler according to any one of the preceding claims, characterized in that The refining filler (80) with the protruding portions (110, 115) is a solid one-piece element.
10. A conical fine grinding filler according to any one of the preceding claims, characterized in that The refining filler (80) is configured to form a stator (50) of the conical refiner (10).
11. A conical fine grinding filler according to any one of the preceding claims, characterized in that The protruding portions (110, 115) are arranged to form support elements for supporting the refining filler (80) in position in a longitudinal direction (LD) of the refining filler (80).
12. A conical refiner (10) for refining fibrous material, the refiner (10) comprising: an inlet (14) for the fibrous material to be refined and an outlet (16) for the refined fibrous material, refiner chamber (30), Feed end frame (40), a conical stator (50) at least partially surrounded by the feed end frame (40), a conical rotor (60) at least partially surrounded by the conical stator (50) such that a refining gap (12) exists between the conical stator (50) and the conical rotor (60), the refining gap (12) having a first end (12a) at least partially facing the inlet (14) and a second end (12b) extending upwardly to the refiner chamber (30), and wherein the conical stator (50) comprises a conical refining filler (80) as claimed in any one of claims 1 to 11, allowing at least one flow (RF) of fiber material to circulate from the refiner chamber (30) back to the refining gap (12) through or past at least one protrusion (110, 115) in the conical refining filler (80).
13. A method of refining a fibrous material in a conical refiner (10), comprising: Using an inlet (14) for the fibrous material to be refined and an outlet (16) for the refined fibrous material, refiner chamber (30), Feed end frame (40), a conical stator (50) at least partially surrounded by the feed end frame (40), A conical rotor (60) is at least partially surrounded by a conical stator (50) such that a refining gap (12) is present between the conical stator (50) and the conical rotor (60), the refining gap (12) having a first end (12a) at least partially facing the inlet (14) and a second end (12b) extending upwardly to the refiner chamber (30), at least one flow (RF) of fibrous material in the refiner (10) circulates from the refiner chamber (30) back to the refining gap (12).
14. The method according to claim 13, characterized in that The conical stator (50) comprises a conical refining filler (80) according to any one of claims 1 to 11, and at least one flow (RF) of the fiber material is recirculated from the refiner chamber (30) back to the refining gap (12) through the at least one opening portion (120, 125), which extends through or through at least one protrusion (110, 115) in the conical refining filler (80).