Pressure screen and rotor thereof
By setting a flow guiding structure on the bottom side of the rotor blades of the pressure screen, the dilution water is discharged along the non-direction, which solves the problems of concentration effect and dilution water waste, and achieves efficient slurry screening and energy consumption optimization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-02-05
- Publication Date
- 2026-04-10
AI Technical Summary
Existing pressure screens suffer from uneven concentration and increased energy consumption due to the concentration effect during screening. Dilution water can easily penetrate the screening elements, resulting in waste and reduced efficiency.
A pressure screen rotor is designed. By setting a flow guiding structure on the bottom side of the rotor blades, the dilution water is discharged in an illegal direction, avoiding direct spraying onto the screening element. The flow guiding structure also extends the mixing time between the dilution water and the slurry, thereby improving the slurry screening efficiency.
It effectively dilutes the slurry, avoids wasting dilution water, reduces the risk of clogging, and improves slurry screening efficiency and energy efficiency.
Smart Images
Figure CN121827122A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to an apparatus for treating fiber suspensions in papermaking and pulping processes, and particularly to a pressure screen and its rotor. Background Technology
[0002] Pressure screens, which consist of a rotor and screening elements (such as screen baskets and screen plates), are commonly used to remove impurities from fiber suspensions. During this screening process, a certain concentration effect occurs on the screening surface (openings or slots) due to the filtration effect. The most common type is the basket-type pressure screen, which operates in an outflow manner. This means that a rotor is installed inside the perforated or slotted screen basket, and the rotor continuously cleans the screening surface at regular intervals.
[0003] Rotors of various shapes and profiles are available on the market. Despite these differences, all of these rotors function by generating pressure and suction pulses onto the screening surface. Concentration occurs across the entire height of the screening element, typically resulting in the highest concentration of slag and the lowest concentration of good pulp. This is actually an undesirable effect, limiting the working capacity of the pressure screen (at higher concentrations, fewer fibers pass through the screen basket) and increasing power consumption (higher rotor speeds reduce the concentration factor but increase energy consumption).
[0004] There are some measures to mitigate this concentration effect by adding dilution water to the screening zone. However, if a large amount of dilution water is added, some of it will "shoot through" the screen basket (through its apertures or slits) to the good pulp zone instead of actually helping to reduce the concentration in the screening zone.
[0005] Finnish Patent FI90792C discloses a pressure screen with its feed inlet located at the bottom and its good slurry outlet and slag outlet located near the top. Diluent water is injected obliquely upwards through pipes from turbulence generators (specifically, in this patent document, protrusions or vanes) on the rotor surface towards the screen to create a turbulent zone. The turbulence generators are arranged such that each position on the screen is swept by at least one turbulent zone as the rotor rotates once. In a preferred embodiment disclosed in this patent document, hollow arms are connected to the rotor, each arm equipped with individual vanes. Diluent water pipes pass through the arms and vanes to nozzles that can be arranged at different positions and directions on the blades and arms. These nozzles spray water from, for example, the leading edge of the blades shown in the accompanying drawings of this patent document, towards the slurry zone near the screen surface to create an induced turbulent zone in front of the blades. Summary of the Invention
[0006] To address the aforementioned technical problems, according to a first aspect of the present invention, a pressure screen for separating input slurry into good slurry and screening residue is provided. The pressure screen includes: a screening element and a rotor surrounded inside the screening element. The rotor includes a hollow cylindrical rotor body driven to rotate by a rotor shaft and a plurality of rotor blades disposed on the outer peripheral surface of the rotor body. A fixedly mounted bearing assembly housing rotatably supports the rotor shaft and is surrounded inside the rotor body. A rotor cavity is formed between the outer peripheral surface of the bearing assembly housing and the inner peripheral surface of the rotor body. A screening zone is formed between the screening element and the rotor, and the input slurry is supplied to this screening zone. The good slurry outlet of the pressure screen is arranged radially outward from the screening element. As the rotor rotates, the slurry in the screening zone passes through the screening element to become good slurry, while the screening residue remaining radially inward from the screening element is discharged from the pressure screen from a screening residue outlet arranged at the lower part of the pressure screen. The pressure screen also includes a dilution water supply system that supplies dilution water through the bearing assembly housing to the rotor cavity and into the slurry screening zone through openings penetrating the inner and outer circumferential surfaces of the rotor body. The openings on the outer circumferential surface of the rotor body are covered radially by rotor blades, and at least one rotor blade has a guide structure on its underside (facing the opening). This guide structure is designed to receive dilution water from the opening and to deflect the projection of the dilution water flow direction at the outlet of the guide structure in a plane perpendicular to the rotor's axis of rotation toward the rotor blade's rotational tangent direction or further toward the rotor than the rotor blade's rotational tangent direction. Here, the "underside" of the rotor blade refers to the side of the rotor blade covering the opening, i.e., the radially inner side facing the outer circumferential surface of the rotor body.
[0007] In this way, the dilution water, upon exiting the rotor blades, does not flow directly towards the screening element along the normal direction, thus preventing the dilution water from directly penetrating the screening element and allowing for effective dilution of the slurry within the screening zone. Simultaneously, the openings on the outer circumference of the rotor body that supply dilution water to the screening zone are covered by the underside of the rotor blades, and therefore are not directly exposed to screen residue and fibers, reducing the risk of clogging. This differs from existing technologies, including the Finnish patent cited above, by specifically addressing and deliberately avoiding the waste of dilution water caused by direct penetration through the screening element—a technical problem not addressed in those existing technologies.
[0008] The flow guiding structure can take the form of any flow guiding groove, flow guiding pipe, or a combination of both to guide the dilution water drawn from the opening in a direction different from the radial direction of the rotor. Preferably, the flow guiding structure is a flow guiding groove installed or formed under the bottom side of the rotor blades, one end of which receives the opening on the outer peripheral surface of the rotor body, and the other end forms an outlet communicating with the slurry screening zone. Here, the "receiving" of the opening by the flow guiding groove (and the flow guiding pipe hereinafter) should be understood as the flow guiding groove communicating with the opening in a way that allows it to receive dilution water from the opening. A completely closed fluid connection may be formed between the flow guiding groove and the opening, or they may simply be arranged in close proximity. Obviously, it is particularly preferred that the side and front ends of the rotor blades are completely abutted against the outer peripheral surface of the rotor body, which makes the periphery of the end of the flow guiding groove receiving the opening completely closed, allowing the dilution water to be completely guided along the flow guiding groove to its other end. In an alternative embodiment of the pressure screen according to the present invention, the flow guiding structure is a flow guiding pipe installed or formed under the bottom side of the rotor vanes, one end of the flow guiding pipe receiving the opening on the outer peripheral surface of the rotor body, and the other end forming an outlet communicating with the screening slurry zone. In another alternative embodiment of the pressure screen according to the present invention, the flow guiding structure comprises a flow guiding pipe installed or formed under the bottom side of the rotor vanes and a flow guiding groove installed or formed under the bottom side of the rotor vanes and communicating with the flow guiding pipe, the flow guiding pipe receiving the opening on the outer peripheral surface of the rotor body, and the flow guiding groove forming an outlet communicating with the screening slurry zone.
[0009] Within the scope of this invention, the direction in which the dilution water is discharged by the guide structure can be arbitrarily chosen, as long as it achieves the effect of preventing the dilution water from being directly sprayed radially towards the screening element along the rotor. Preferably, the guide structure is designed to guide the dilution water drawn from the opening along the rotational tangential direction of the rotor. In an alternative embodiment of the pressure screen according to the invention, the guide structure is designed to guide the dilution water drawn from the opening in a direction deflected more upward or more downward relative to the rotational tangential direction of the rotor. The tangential component of the dilution water prolongs its mixing time with the slurry, while an appropriate normal component creates turbulence in the screening zone, promoting thorough mixing of the dilution water and the slurry. It should be noted that although the addition of dilution water will cause turbulence to some extent, the present invention is primarily aimed at preventing the direct penetration of dilution water into the screening element, rather than creating or avoiding turbulence as its main objective.
[0010] Preferably, the flow guiding structure is designed to guide dilution water from the opening outwards from the tail end of the rotor blades. In this way, the dilution water enters the screening zone in the opposite direction of rotor rotation, increasing the velocity difference between the slurry suspension and the rotor, thereby improving screening efficiency. Alternatively, the flow guiding structure can also be designed to guide dilution water from the opening outwards from the side ends of the rotor blades. Here, the "tail end" of the rotor blades refers to the rearmost end of the blade along the direction of rotation, where the fluid leaves last, corresponding to the front end of the rotor blade's water-facing surface. The "side ends" of the rotor blades are the two side edges between their front and rear ends.
[0011] The pressure screen rotor has several rotor blades that correspond to several flow guiding structures. Preferably, each of the flow guiding structures of the pressure screen rotor is designed to guide the dilution water drawn from the opening in the same or different directions.
[0012] The profile height of the rotor blades gradually decreases towards their tail end. In an advantageous embodiment of the pressure screen according to the invention, the height of the flow guiding structure gradually decreases towards the tail end of the rotor blades, while the width gradually increases towards the tail end. In this way, the flow channel cross-section of the flow guiding structure remains substantially constant, allowing dilution water to flow smoothly within it. However, the invention is not limited to this; other combinations of height and width variations in the flow guiding structure are possible, and even if such variations prevent the flow channel cross-section from remaining substantially constant, it does not impede the overall functionality of the pressure screen of the invention.
[0013] According to a second aspect of the invention, a pressure screen rotor is provided, comprising a hollow cylindrical rotor body driven to rotate by a rotor shaft and a plurality of rotor blades disposed on the outer peripheral surface of the rotor body. A fixedly mounted bearing assembly housing rotatably supports the rotor shaft and is enclosed within the rotor body. A rotor cavity of the rotor is formed between the outer peripheral surface of the bearing assembly housing and the inner peripheral surface of the rotor body. A dilution water supply system supplies dilution water through the bearing assembly housing to the rotor cavity and discharges it to the outer peripheral surface of the rotor body through an opening penetrating the inner and outer peripheral surfaces of the rotor body. According to the invention, the opening is covered radially by the rotor blades, and a flow guide structure is provided under the bottom side of at least one rotor blade. The flow guide structure is designed to receive dilution water from the opening and to deflect the projection of the flow direction of the dilution water at the outlet of the flow guide structure in a plane perpendicular to the rotation axis of the rotor towards the rotation tangent direction of the rotor blade or more towards the rotor than the rotation tangent direction of the rotor blade.
[0014] In this way, the dilution water does not flow directly towards the screening element along the normal direction when leaving the rotor blades, thus preventing the dilution water flow from directly penetrating the screening element and allowing the slurry in the screening zone to be effectively diluted. At the same time, since the opening providing the dilution water is covered under the bottom side of the rotor blades, it is not directly exposed to the screen residue and fibers, thereby reducing the risk of clogging.
[0015] The flow guiding structure can take the form of any flow guiding groove, flow guiding pipe, or a combination of both to guide the dilution water drawn from the opening in a direction different from the radial direction of the rotor. Preferably, the flow guiding structure is a flow guiding groove installed or formed under the bottom side of the rotor vane, one end of which receives the opening on the outer peripheral surface of the rotor body, and the other end forms an outlet communicating with the slurry screening zone. In an alternative embodiment of the pressure screen rotor according to the present invention, the flow guiding structure is a flow guiding pipe installed or formed under the bottom side of the rotor vane, one end of which receives the opening on the outer peripheral surface of the rotor body, and the other end forms an outlet communicating with the slurry screening zone. In another alternative embodiment of the pressure screen according to the present invention, the flow guiding structure is composed of a flow guiding pipe installed or formed under the bottom side of the rotor vane and a flow guiding groove installed or formed under the bottom side of the rotor vane and communicating with the flow guiding pipe, the flow guiding pipe receiving the opening on the outer peripheral surface of the rotor body, and the flow guiding groove forming an outlet communicating with the slurry screening zone.
[0016] Within the scope of this invention, the direction in which the dilution water is discharged by the guide structure can be arbitrarily selected, as long as it achieves the effect of preventing the dilution water from being directly sprayed radially towards the screening element along the rotor. Preferably, the guide structure is designed to be adapted to discharge the dilution water drawn from the opening along the rotational tangential direction of the rotor. In an alternative embodiment of the pressure screen rotor according to the invention, the guide structure is designed to be adapted to discharge the dilution water drawn from the opening in a direction deflected more upward or more downward relative to the rotational tangential direction of the rotor, and / or to discharge the dilution water drawn from the opening in a direction deflected more toward or more away from the rotor relative to the rotational tangential direction of the rotor. The tangential component of the dilution water prolongs its mixing time with the slurry, while an appropriate normal component creates turbulence in the screening slurry zone, promoting thorough mixing of the dilution water and the slurry.
[0017] Preferably, the flow guiding structure is designed to guide dilution water from the opening outwards from the tail end of the rotor blades. In this way, the dilution water enters the screening zone in the opposite direction of rotor rotation, increasing the velocity difference between the slurry suspension and the rotor, thereby improving screening efficiency. However, as an alternative or supplement, the flow guiding structure may also be designed to guide dilution water from the opening outwards from the side end of the rotor blades.
[0018] The pressure screen rotor has several rotor blades that correspond to several flow guiding structures. Preferably, each of the flow guiding structures of the pressure screen rotor is designed to guide the dilution water drawn from the opening in the same or different directions.
[0019] The profile height of the rotor blades gradually decreases towards their tail end. In an advantageous embodiment of the pressure screen according to the invention, the height of the flow guiding structure gradually decreases towards the tail end of the rotor blades, while the width gradually increases towards the tail end. In this way, the flow channel cross-section of the flow guiding structure remains substantially constant, allowing dilution water to flow smoothly within it. However, the invention is not limited to this; other combinations of height and width variations in the flow guiding structure are possible, and even if such variations prevent the flow channel cross-section from remaining substantially constant, it does not impede the overall functionality of the pressure screen of the invention. Attached Figure Description
[0020] The exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and the principles of the present invention will be explained.
[0021] Figure 1 This is a schematic diagram of a pressure screen according to an embodiment of the present invention.
[0022] Figure 2a , Figure 2b This is a schematic diagram of the rotor blades of a pressure screen from different perspectives. Detailed Implementation
[0023] In the claims and description of this invention, the term "screening element" refers to a structural element having a screening surface, such as a screen cylinder, screen basket, or screen plate, and its shape includes, but is not limited to, cylindrical or conical shapes.
[0024] like Figure 1 As shown, the pressure screen 100 includes a rotor 10 and a screening element 20. The rotor 10 is surrounded internally by the screening element 20, and the gap between them forms a slurry screening zone 1. The rotor 10 includes a rotor body 11 and a plurality of rotor blades 12 disposed on the outer peripheral surface of the rotor body 11 facing the slurry screening zone 1. Exemplarily, slurry F is input at the upper part of the pressure screen 100, and then screened in the slurry screening zone 1 due to the rotation of the rotor 10 and the pulse action of the rotor blades 12. The good slurry outlet of the pressure screen is arranged radially outside the screening element. As the rotor 10 rotates, the slurry F in the slurry screening zone 1 passes through the screening element 20 and becomes good slurry A. The screen residue R remaining radially inside the screening element 20 is discharged from the pressure screen 100 from the screen residue outlet arranged at the lower part of the pressure screen.
[0025] The pressure screen 100 also includes a dilution water supply system 30, which includes, for example, a number of specially designed pipes. The rotor shaft 14 drives the cylindrical rotor body 11 to rotate, but the bearing assembly housing 15 is fixedly mounted, thus allowing the dilution water D to enter the rotor cavity 16, which is enclosed by the outer peripheral surface of the bearing assembly housing 15 and the inner peripheral surface of the rotor body 11, along these pipes of the dilution water supply system 30, for example, through the bearing assembly housing 15. The rotor body 11 has a number of openings 13 penetrating its inner and outer peripheral surfaces, allowing the rotor cavity 16 to be in fluid communication with the slurry screening zone 1. In this way, the dilution water supply system 30 can guide the dilution water through the openings 13 to the outside of the outer peripheral surface of the rotor body 11.
[0026] exist Figure 1 In this example, dilution water D passes through the bearing assembly housing 15 from bottom to top through the pipes of the dilution water supply system 30 and enters the rotor cavity 16, but this is merely an example. Since the bearing assembly housing 15 is fixedly installed and does not rotate with the rotor body 11, the actual location where the pipes exit the bearing assembly housing 15 may not be at the top of the bearing assembly housing 15, but rather on its periphery.
[0027] exist Figure 1 In addition to illustrating with a single arrow how the dilution water D flows out of the bearing assembly housing 15 and flows within the rotor cavity 16 to the opening 13 that penetrates the inner and outer circumferential surfaces of the rotor body 11, a portion of the dilution water D flowing out in the gap between the bottom surface of the cylindrical rotor body 11 and the corresponding flange of the bearing assembly housing 15 is also illustrated with a single arrow.
[0028] exist Figure 1 In the embodiment shown, the opening 13 is located below the rotor blade 12, and each opening 13 is covered by the rotor blade 12.
[0029] The structure of rotor blade 12 is in Figure 2a , Figure 2b It is presented more clearly in the text. For example... Figure 2b As shown, the rotor blade 12 has a flow-guiding groove 4 on the side (or inner side) facing the opening 13. When the rotor blade 12 is fixed to the rotor body 11, the flow-guiding groove 4 has at least a receiving portion 41 directly opposite the opening 13. The flow-guiding groove 4 extends from the receiving portion 41 to the edge of the rotor blade 12. During the operation of the pressure screen 100, dilution water is drawn out from the opening 13 and enters the flow-guiding groove 4. Due to the orientation of the flow-guiding groove 4, the dilution water is discharged in a direction different from the radial direction of the rotor. Figure 2a As shown, the end of the flow guide groove 4 forms a notch on the rotor blade 12, from which dilution water flows out.
[0030] Therefore, the dilution water can mix very well with the slurry in the screening zone, rather than being lost to the good slurry side after "piercing" the screening elements.
[0031] In some embodiments, such as Figure 1 , Figure 2a , Figure 2b As shown, the guide groove 4 extends to the tail end of the rotor blade 12. Therefore, the direction of the dilution water outflow is opposite to the rotation direction of the rotor 10, thereby increasing the screening efficiency by increasing the differential speed of the slurry suspension relative to the rotor.
[0032] In some embodiments, such as Figure 2b As shown, the width of the guide groove 4 gradually increases towards the tail end of the rotor blade 12, thereby making the dilution water flow more smoothly.
[0033] The embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the various embodiments, or to enable others skilled in the art to understand the disclosed embodiments.
[0034] List of reference numerals 100 pressure screen 1. Slurry Screening Zone 10 rotors 11 Rotor body 12 rotor blades 13 Opening 14 Rotor shaft 15 Bearing assembly housing 16 Rotor inner cavity 20 Screening Elements 30. Dilution water supply system 4. Flow guide groove 41. Contracting Department A good liquor R Screening residue D. Dilution water F slurry.
Claims
1. A pressure screen for separating an input slurry into a good slurry and screen residue, said pressure screen comprising: Screening elements; The rotor includes a hollow cylindrical rotor body driven to rotate by a rotor shaft and a plurality of rotor blades disposed on the outer peripheral surface of the rotor body. A fixedly mounted bearing assembly housing rotatably supports the rotor shaft and is surrounded inside the rotor body. A rotor cavity of the rotor is formed between the outer peripheral surface of the bearing assembly housing and the inner peripheral surface of the rotor body. The rotor is surrounded inside by the screening element. The gap between the screening element and the rotor forms a slurry screening zone. The input slurry is supplied to the slurry screening zone. The good slurry outlet of the pressure screen is arranged radially outside the screening element. As the rotor rotates, the slurry in the screening zone passes through the screening element and becomes good slurry. The screening residue remaining radially inside the screening element is discharged from the pressure screen through the screening residue outlet arranged at the lower part of the pressure screen. The pressure screen is characterized in that it further includes a dilution water supply system, which supplies dilution water through the bearing assembly housing to the rotor cavity and through an opening penetrating the inner and outer circumferential surfaces of the rotor body into the slurry screening zone. The opening is covered by the rotor blades in the radial direction of the rotor, and at least one rotor blade has a flow guide structure on its underside. The flow guide structure is designed to receive dilution water from the opening and to deflect the projection of the flow direction of the dilution water at the outlet of the flow guide structure onto the rotational tangent direction of the rotor blades or further toward the rotor than the rotational tangent direction of the rotor blades.
2. The pressure screen according to claim 1, characterized in that, The flow guiding structure is a flow guiding groove installed or formed under the bottom side of the rotor blades. One end of the flow guiding groove receives the opening on the outer peripheral surface of the rotor body, and the other end of the flow guiding groove forms an outlet that communicates with the slurry screening zone.
3. The pressure screen according to claim 1, characterized in that, The flow guiding structure is a flow guiding pipe installed or formed under the bottom side of the rotor blades. One end of the flow guiding pipe receives the opening on the outer peripheral surface of the rotor body, and the other end of the flow guiding groove forms an outlet that communicates with the slurry screening zone.
4. The pressure screen according to claim 1, characterized in that, The flow guiding structure consists of a flow guiding pipe installed or formed under the bottom side of the rotor blades and a flow guiding groove installed or formed under the bottom side of the rotor blades and communicating with the flow guiding pipe. The flow guiding pipe receives the opening on the outer peripheral surface of the rotor body, and the flow guiding groove forms an outlet communicating with the slurry screening zone.
5. The pressure screen according to any one of claims 1 to 4, characterized in that, The flow guiding structure is designed to guide the dilution water drawn from the opening in a direction that deflects upward or downward relative to the rotational tangential direction of the rotor.
6. The pressure screen according to claim 5, characterized in that, The flow guiding structure is designed to allow dilution water drawn from the opening to be discharged from the tail or side of the rotor blades.
7. The pressure screen according to claim 6, characterized in that, Each of the flow guiding structures of the pressure screen rotor is designed to guide the dilution water drawn from the opening in the same or different directions.
8. The pressure screen according to claim 7, characterized in that, The height of the flow guiding structure gradually decreases towards the tail end of the rotor blades, while the width gradually increases towards the tail end of the rotor blades.
9. A pressure screen rotor, the pressure screen rotor comprising a hollow cylindrical rotor body driven to rotate by a rotor shaft and a plurality of rotor blades disposed on the outer peripheral surface of the rotor body, characterized in that, A fixedly mounted bearing assembly housing rotatably supports the rotor shaft and is enclosed within the rotor body. A rotor cavity is formed between the outer peripheral surface of the bearing assembly housing and the inner peripheral surface of the rotor body. The dilution water supply system supplies dilution water through the bearing assembly housing to the rotor cavity and discharges it to the outer peripheral surface of the rotor body through an opening penetrating the inner and outer peripheral surfaces of the rotor body. The opening is covered by the rotor blades in the radial direction of the rotor, and at least one rotor blade has a flow guide structure on its underside. The flow guide structure is designed to receive dilution water from the opening and to deflect the projection of the flow direction of the dilution water at the outlet of the flow guide structure onto the rotational tangent direction of the rotor blades or further toward the rotor than the rotational tangent direction of the rotor blades.
10. The pressure screen rotor according to claim 9, characterized in that, The flow guiding structure is a flow guiding groove installed or formed under the bottom side of the rotor blades. One end of the flow guiding groove receives the opening on the outer peripheral surface of the rotor body, and the other end of the flow guiding groove forms an outlet that communicates with the slurry screening zone.
11. The pressure screen rotor according to claim 9, characterized in that, The flow guiding structure is a flow guiding pipe installed or formed under the bottom side of the rotor blades. One end of the flow guiding pipe receives the opening on the outer peripheral surface of the rotor body, and the other end of the flow guiding groove forms an outlet that communicates with the slurry screening zone.
12. The pressure screen rotor according to claim 9, characterized in that, The flow guiding structure consists of a flow guiding pipe installed or formed under the bottom side of the rotor blades and a flow guiding groove installed or formed under the bottom side of the rotor blades and communicating with the flow guiding pipe. The flow guiding pipe receives the opening on the outer peripheral surface of the rotor body, and the flow guiding groove forms an outlet communicating with the slurry screening zone.
13. The pressure screen rotor according to any one of claims 9 to 12, characterized in that, The flow guiding structure is designed to guide the dilution water drawn from the opening in a direction that deflects upward or downward relative to the rotational tangential direction of the rotor.
14. The pressure screen rotor according to claim 13, characterized in that, The flow guiding structure is designed to allow dilution water drawn from the opening to be discharged from the tail or side of the rotor blades.
15. The pressure screen rotor according to claim 14, characterized in that, Each of the flow guiding structures of the pressure screen rotor is designed to guide the dilution water drawn from the opening in the same or different directions.
16. The pressure screen rotor according to claim 15, characterized in that, The height of the flow guiding structure gradually decreases towards the tail end of the rotor blades, while the width gradually increases towards the tail end of the rotor blades.