screening equipment
A technology of screening equipment and sieve cylinders, applied in separation methods, filtration separation, chemical instruments and methods, etc., can solve the problems of turbulence and disturbance of flow patterns, difficult to control input flow velocity, velocity and acceleration changes, etc., to achieve flow pattern and Uniform, uniform distribution, stable flow pattern effect
Active Publication Date: 2022-04-26
VALMET TECH OY
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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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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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The invention relates to a screening device for screening pulp suspensions and / or for stock preparation, comprising a screen drum and a rotor inside the screen drum, foils connected to the rotor by foil arms, the screening device comprising a supply chamber and An inlet fitting through which the input flow of the slurry suspension is led into the supply chamber, the screening device comprising a housing with an inlet opening. The screening device comprises a flow guide inside the screening device extending a distance from the inlet opening in the housing of the screening device, and the flow guide in the supply chamber of the screening device guides the incoming flow into the supply chamber of the screening device and prevents ingress The incoming flow of the filter meets the incoming flow already in the supply chamber of the screening device.
Description
technical field [0001] The present invention relates primarily to the production of fibrous webs. In particular, the present invention relates to a screening apparatus 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 by a plurality of devices arranged consecutively in a production line. A typical production and processing line includes a forming section including a headbox and a forming unit, followed by a drying and coiling section. The production and processing line may also include other devices and sections for finishing the fibrous web, such as a size press section, a calender, a coating section. The production and handling lines also typically include at least one winder for forming customer rolls and roll wrapping devices. [0003] Prior to the headbox, the pulp suspension comprising recycled or virgi...
Claims
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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