Screening device

A technology of screening equipment and sieve cylinder, which is applied in the direction of fixed filter element filter, filtration separation, steam condensation, etc., can solve problems such as difficult control of input flow velocity, flow pattern turbulence and disturbance, velocity and acceleration changes, etc., to achieve flow pattern Stability and uniformity, effective screening, effect of reducing rotation speed

Active Publication Date: 2020-08-07
VALMET TECH OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In screening devices with inlet types known in the prior art, it is difficult to generate a steady input flow, because the fluid from the inlet fitting (terminating in the inlet opening) encounters the flow towards the rotor and The fluid in the foil region and the input flow will cause disturbance and instability of the flow pattern
This also makes it difficult to control the input flow and its velocity, as instabilities cause velocity and acceleration changes in the fluid and can also cause turbulence and disturbance to the flow pattern in the screening space of the screening device

Method used

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Examples

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Embodiment Construction

[0029] figure 1An example of a screening apparatus 10 according to the invention is shown, eg a machine screen 10, comprising a screen drum 12 and a rotor 13 located within the screen drum 12 and rotating therein. The rotor 13 includes a hub 16 connected to a motor or the like that powers the rotational movement of the rotor 13 . Screen cylinder 12 is cylindrical (cylindrical), and its surface comprises hole (for example circular or elongated hole), or comprises the slot that is provided in the surface of screen cylinder 12 parallel to each other, is used for the pulp suspension during screening. The accept stock of stock or the accept stock of stock pass through during stock preparation. A rotor 13 arranged inside the cylindrical screen drum 12 is used to rotate the slurry in the screening device 10 in the screening space between the inner surface of the screen drum and the outer surface of the rotor body 12 of the rotor 13 . The foil 14 is located in the screening space, i...

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Abstract

The invention relates to a screening device for screening pulp suspensions and / or for stock preparation, which screening device (10) comprises a screening cylinder (12) and an inside the screening cylinder (12) located rotor (13) with foils (14) connected to the rotor (13) by foil arms (17), which screening device (10) comprises an inlet fitting (20) and a feed chamber (11) above of the screeningcylinder (12) into which inlet flow of the pulp suspension is guided through the inlet fitting (20), which screening device (10) comprises a housing (25), which housing (25) has an inlet opening (28)for the inlet fitting (20). The screening device (10) comprises a flow guide (29, 30) extending from the inlet opening (28) in the housing (25) of the screening device (10) a distance inside the screening device (10) and that the flow guide (29, 30) inside the feed chamber (11) of the screening device (10) guides the inlet flow into the feed chamber of the screening device (10) and prevents the incoming inlet flow to meet the inlet flow already in the feed chamber (11) of the screening device (10).

Description

technical field [0001] The invention mainly relates to the production of fibrous webs. In particular, the invention relates to a screening device for screening pulp suspensions. Background technique [0002] As is known from the prior art, in fiber web machines, especially in paper and board machines, fiber webs are produced and processed in assemblies formed of several devices arranged in succession in a production line. A typical production and processing line comprises a forming section comprising a headbox and a forming unit, a press section followed by a drying section and a coiling section. The production and processing line may also comprise other devices and sections for finishing the fibrous web, eg size press, calender, coating section. The production and processing line usually also includes at least one winder for forming customer rolls and a roll packaging device. [0003] Prior to the headbox, a pulp suspension comprising recycled or virgin fibers is process...

Claims

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Application Information

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IPC IPC(8): D21D5/02D21D5/16
CPCD21D5/02D21D5/16D21D5/026B01D5/0024B01D29/11D21D5/06
Inventor图莫·阿霍J·赫克克拉
OwnerVALMET TECH OY