Blade element

Patent metadata

Field	Value
Publication number	US-11732587-B2
Application number	US-202217732103-A
Country	US
Kind code	B2
Filing date	Apr 28, 2022
Priority date	Apr 29, 2021
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

A blade element (4, 8) for a comminution device (1) to comminute fiber material has at least one comminution section (22) with comminution parts (20, 24, 25, 26) and free spaces (21) therebetween, and at least one feed section (23) extending at least partly in a longitudinal direction (X) of the blade element (4, 8), each feed section (23) intended to feed fiber material to the respective comminution section (22). The comminution parts have a first dimension (d20a, d20b, d20c, d24a, d24b, d24c) extending in a circumferential direction (C) of the blade element and a second dimension (e20a, e20b, e20c, e24a, e25a, e26a) extending in the longitudinal direction (X) of the blade element. At the same longitudinal (X) position in the blade element (4, 8) the first dimension of the comminution parts is arranged to increase in the circumferential direction (C) of the blade element toward the feed section.

First claim

We claim:

1. A blade element for a comminution device which comminutes fiber material, the comminution device having a rotor which rotates in a circumferential direction opposite at least one of a stator or a second rotor, wherein a longitudinal direction is defined perpendicular to the circumferential direction, the comminution device having a feed channel and a discharge chamber, the blade element comprising:
portions of the blade element defining an inner end edge over which fiber material to be processed enters, and an outer end edge over which processed fiber material leaves the blade element;
portions of the blade element defining a leading edge and a trailing edge so that fiber material passes from the leading edge toward the trailing edge;
wherein the blade element has at least one comminution section between the leading edge and the trailing edge and between the inner end edge and the outer end edge, the at least one comminution section having a plurality of protruding comminution parts wherein the blade element defines free spaces between the plurality of comminution parts for providing flow channels for the flow of fiber material to be processed;
wherein each comminution part has a first dimension extending in the circumferential direction of the blade element and a second dimension extending in the longitudinal direction of the blade element, and the blade element has at least one feed section extending in the longitudinal direction of the blade element, each feed section arranged to feed fiber material to the comminution section;
wherein at a selected longitudinal position on the blade element the first dimension of the comminution parts increase in the circumferential direction of the blade element toward the feed section;
at a selected circumferential position on the blade element the second dimension of the comminution parts increase in the longitudinal direction of the blade element toward the outer end edge such that the second dimension of at least one comminution part is larger than the corresponding second dimension of at least one other comminution part that is farther away from the outer end edge in the longitudinal direction of the blade element.

2. The blade element of claim 1 wherein the first dimension of the comminution parts is arranged to increase substantially continuously toward the feed section in such a way that the first dimension of the comminution part being closer to the feed section in the circumferential direction of the blade element is larger than the first dimension of the comminution part being located farther away from the feed section.

3. The blade element of claim 1 wherein the first dimension of the comminution parts increases stepwise toward the feed section in such a way that the first dimension of the comminution parts in a group of neighbouring comminution parts is equal but the first dimension of the comminution parts is larger in a group of neighbouring comminution parts being closer to the feed section in the circumferential direction of the blade element.

4. The blade element of claim 1 wherein the feed section extends along a side of the blade element from the inner end edge to the outer end edge, the feed section being wider at the inner end edge of the blade element than at the outer end edge of the blade element, and wherein the comminution parts are arranged at an acute angle to a radial line which extends from the inner end edge to the outer end edge and each comminution part has a center line and has a width perpendicular to its center line, such that the width of the comminution parts positioned closer to the outer end edge are wider than the comminution parts which are closer to the inner end edge.

5. The blade element of claim 1 wherein at the same longitudinal position in the blade element an increase in the first dimension of the comminution parts between the comminution part located to be the closest to the feed section and the comminution part located to be the farthest away from the feed section is 10-80%.

6. The blade element of claim 5 wherein at the same longitudinal position in the blade element an increase in the first dimension of the comminution parts between the comminution part located to be the closest to the feed section and the comminution part located to be the farthest away from the feed section is 10-50%.

7. The blade element of claim 1 wherein the second dimension of the comminution parts increases substantially continuously toward the outer end edge of the blade element in such a way that the second dimension of the comminution part being closer to the outer end edge in the longitudinal direction of the blade element is larger than the second dimension of the comminution part being located farther away from the outer end edge.

8. The blade element of claim 1 wherein the second dimension of the comminution parts increases stepwise toward the outer end edge in such a way that the second dimension of the comminution parts in a group of neighbouring comminution parts is equal but the second dimension of the comminution parts is larger in a group of neighbouring comminution parts being closer to the outer end edge.

9. The blade element of claim 1 wherein an increase in the second dimension of the comminution parts between the comminution part located to be the closest to the inner end edge and the comminution part located to be the farthest away from the inner end edge is 10-100%.

10. The blade element of claim 9 wherein an increase in the second dimension of the comminution parts between the comminution part located to be the closest to the inner end edge and the comminution part located to be the farthest away from the inner end edge is 10-50%.

11. The blade element of claim 1 further comprising:
a rotor to which the blade element is fixed; and
a frame on which the rotor is supported for rotatable motion with respect to a stator or a second rotor, to form a refiner for refining fiber material.

12. The blade element of claim 1 further comprising:
a rotor to which the blade element is fixed; and
a frame on which the rotor is supported for rotatable motion with respect to a stator or a second rotor, to form a disperser for dispersing fiber material.

13. A blade element for a refiner for refining fiber material or a disperser for dispersing fiber material, the refiner or disperser having a rotor which rotates in a circumferential direction opposite at least one of a stator or a second rotor, wherein a longitudinal direction is defined perpendicular to the circumferential direction, the refiner or disperser having a feed channel and a discharge chamber, the blade element comprising:
portions of the blade element defining an inner edge over which fiber material to be processed enters, and an outer edge over which processed fiber material leaves the blade element;
portions of the blade element defining a leading edge and a trailing edge so that fiber material passes from the leading edge toward the trailing edge;
wherein the blade element has a comminution section between the leading edge and the trailing edge and between the inner edge and the outer edge, the comminution section having a plurality of protruding bars with free spaces therebetween defining flow channels for the flow of the fiber material to be processed along a comminution surface defined by the plurality of bars within the comminution section;
wherein the blade element has a feed section extending in the longitudinal direction of the blade element, the feed section arranged to feed fiber material to the refining section and being without blade bars;
wherein the feed section extends along a side of the b

Assignees

• Valmet Technologies Oy

Inventors

• SJÖSTRÖM Håkan
• Himanka Tuomas

Classifications

• F01D5/14 Primary

  Form or construction (selecting particular materials, measures against erosion or corrosion F01D5/28) · CPC title

• D21D1/22 Primary

  Jordans · CPC title

• D21D1/306

  Discs · CPC title

• F01D5/02

  Blade-carrying members, e.g. rotors (rotors of non-bladed type F01D1/34; stators F01D9/00 {; selecting particular materials F01D5/28}) · CPC title

• F01D9/02

  Nozzles; Nozzle boxes; Stator blades; Guide conduits {, e.g. individual nozzles (nozzle boxes F01D9/047)} · CPC title