CN202730529U

CN202730529U - Pressure screen for papermaking pulp

Info

Publication number: CN202730529U
Application number: CN 201220345934
Authority: CN
Inventors: 李文斌
Original assignee: Guangdong Lee and Man Paper Manufacturing Co Ltd
Current assignee: Guangdong Lee and Man Paper Manufacturing Co Ltd
Priority date: 2012-07-17
Filing date: 2012-07-17
Publication date: 2013-02-13
Anticipated expiration: 2022-07-17

Abstract

The utility model relates to the technical field of papermaking pulp screening equipment, in particular to a pressure screen for papermaking pulp, which comprises a shell, wherein the outer wall of the shell is provided with a pulp inlet, an accepted pulp outlet and a tail pulp outlet which are arranged along the tangential direction of the shell, the shell is internally provided with a driving shaft, a rotary wing and a screen cylinder. The pressure screen for the papermaking pulp, adopting the technical scheme, has the advantages that the structure is simple, and the design is reasonable; and the special water drop shape section design of the rotary wing is adopted, so that the front of the rotation direction of the rotary wing can quickly push short fibers in the pulp to quickly pass through screen seams or screen holes to be flowed out; and by the special shape of the rotary wing, a complex flowing mode, i.e., turbulent flow, can be formed on the surface of the screen cylinder, so that the coarse and big fibers, pulp lumps, paper scraps and the like in the pulp can be effectively decomposed, the generation of tail pulp can be reduced, and the pulp yield of the accepted paper pulp can be improved; and the tail can produce negative pulses which can effectively avoid the condition that the screen holes or screen seams in the screen cylinder can be blocked by the tail pulp.

Description

A kind of paper making pulp pressurized screen

Technical field

The utility model relates to paper making pulp screening installation technical field, specifically, relates to a kind of paper making pulp pressurized screen.

Background technology

In paper industry slurrying link, pressurized screen is the important screening installation of slurrying.Rotor and screen cylinder are installed respectively in the cylindrical shell of pressurized screen, and it is to utilize the rotation of rotor that the slurry in the cylindrical shell is got rid of to screen cylinder, and the slurry by screen cylinder is good slurry, and the slurry by screen cylinder is not tail slurry or slag slurry, need to carry out further separation screening.

At present, the cylinder inboard wall of traditional pressurized screen is smooth upper guide ring and the lower guide ring of connecting surface respectively, space in the top of upper guide ring and the cylindrical shell between the top is upper screening area, and the space between the bottom is lower screening area in lower guide ring bottom and the cylindrical shell, upper guide ring and lower guide ring each other be spaced apart the tail slurry district, upper guide ring and lower guide ring respectively and gapped between the rotor, this gap is the main thoroughfare that enters respectively the tail slurry district for the tail slurry in the screening area up and down.Thus, there is following shortcoming in the tradition pressurized screen in the middle of reality is used: one, since upper guide ring and lower guide ring respectively and the gap between the rotor less, so that when the tail slurry in the screening area only enters the tail slurry district by this gap up and down, often choking phenomenon can appear, its consequence can cause that tail slurry too much is gathered on the screen cylinder and blocks its sieve aperture, badly influences the efficient of screening slurry; Two, because the surface of upper guide ring and lower guide ring is smooth smooth shape, can't turbulization when the slurry in upper screening area and the lower screening area rotates under the rotor effect, thereby cause thick fiber contained in the slurry, slurry group, the scraps of paper etc. to decompose, its consequence has not only increased the generation of tail slurry greatly, and badly influence the pulping rate of good paper pulp, wasted most valuable Papermaking Resource.

Therefore, demanding providing a kind of urgently effectively avoids the sieve aperture on the screen cylinder to be blocked by tail slurry, and can make slurry turbulization when rotating, effectively decompose thick fiber contained in the slurry, slurry group, the scraps of paper etc., to reduce the generation of tail slurry, improve the paper making pulp pressurized screen of the pulping rate of good paper pulp.

Summary of the invention

The utility model has overcome defective of the prior art, and a kind of paper making pulp pressurized screen is provided, and this apparatus structure is simple, and is reasonable in design, can effectively avoid the sieve aperture on the screen cylinder to be blocked by tail slurry, reduces the generation of tail slurry, improves the pulping rate of good paper pulp.

The technical solution adopted in the utility model is in order to achieve the above object:

A kind of paper making pulp pressurized screen, comprise housing, the housing outer wall is provided with stock inlet, good slurry outlet and the tail slurry outlet that arranges along the housing tangential direction, power transmission shaft, rotor and screen cylinder are set in the housing, power transmission shaft drives rotor and rotates, and rotor is positioned at screen cylinder, and good slurry outlet is positioned at the screen cylinder outside, the tail slurry outlet is positioned at the screen cylinder top, and the screen cylinder below arranges heavy slag capture tank.

Further, extend along the excircle of power transmission shaft to the screen cylinder direction and to be provided with some support arms, be connected with rotor between support arm and the screen cylinder inwall.

Further, support arm is provided with four groups, and every group of support arm be an affixed rotor all, and the every group of support arm that is oppositely arranged on the power transmission shaft excircle is on same straight line, and four groups of support arms are the setting of equidistantly arranging along the excircle of power transmission shaft.

Further, the cross section of rotor is drops.

Further, screen cylinder is slotted screen or hole sizer.

Further, the top of housing sets out gas port.

Further, the top of housing arranges the dilution water import.

Further, between screen cylinder and the heavy slag capture tank V-type capture tank is set.

Further, heavy slag capture tank arranges valve.

Further, stock inlet arranges the slurry-inlet valve door.

The beneficial effects of the utility model are:

Adopt a kind of paper making pulp pressurized screen of above technical scheme, this apparatus structure is simple, reasonable in design, the design of the water-drop-shaped cross section of rotor uniqueness: one, the front portion of the rotor wing rotation direction staple fibre that can promote fast in the slurry outflows by sieve seam or sieve aperture rapidly; Two, to make slurry stream form the complicated type of flow on the screen cylinder surface be flow-disturbing to the unique shape of rotor, effectively decomposed thick fiber contained in the slurry, slurry group, the scraps of paper etc., reduced the generation of tail slurry, improved the pulping rate of good paper pulp; And at its afterbody generation underbalance pulse, this underbalance pulse can effectively avoid sieve aperture or the sieve seam on the screen cylinder not stopped up by tail slurry.

Description of drawings

Accompanying drawing is used to provide further understanding of the present utility model, is used from explanation the utility model with embodiment one of the present utility model, does not consist of to restriction of the present utility model, in the accompanying drawings:

Fig. 1 is the structural representation of a kind of paper making pulp pressurized screen of the utility model.

Fig. 2 is the screen cylinder of a kind of paper making pulp pressurized screen of the utility model and the structural representation of rotor.

Fig. 3 is the structural representation of an embodiment of the top cover of a kind of paper making pulp pressurized screen of the utility model.

In Fig. 1 to Fig. 3, include:

1---housing;

2---stock inlet;

3---good slurry outlet;

4---the tail slurry outlet;

5---power transmission shaft;

6---screen cylinder;

7---support arm;

8---rotor;

9---the gas outlet;

10---heavy slag capture tank;

11---the dilution water import;

12---the V-type capture tank;

13---valve.

The specific embodiment

Below in conjunction with accompanying drawing preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the utility model, and be not used in restriction the utility model.

A kind of paper making pulp pressurized screen, as shown in Figure 1 to Figure 3, comprise housing 1, housing 1 outer wall is provided with stock inlet 2, good slurry outlet 3 and the tail slurry outlet 4 that arranges along housing 1 tangential direction, housing 1 interior power transmission shaft 5, rotor 8 and the screen cylinder 6 of arranging, and power transmission shaft 5 drives rotor 8 and rotates, rotor 8 is positioned at screen cylinder, good slurry outlet 3 is positioned at screen cylinder 6 outsides, and tail slurry outlet 4 is positioned at screen cylinder 6 tops, and screen cylinder 6 belows arrange heavy slag capture tank 10.

Concrete: screen cylinder 6 is fixed on shell the inside, in rotor 8 outsides, does not rotate, and forms a cavity between screen cylinder 6 and the shell, has crossed the slurry of sieve seam and has discharged by the good slurry outlet 3 on the shell after this concentrates.

Can be good slurry or short fiber, and can not can discharge from the tail slurry outlet 4 on pressurized screen top by the part of sieve seam or sieve aperture by sieve seam or sieve aperture from good slurry outlet 3 slurries that eject at pressurized screen middle part, be slag slurry or long fine.

As shown in Figure 2, rotor 8 is installed on the power transmission shaft 5, and the driven by motor High Rotation Speed is arranged.Excircle along power transmission shaft 5 is provided with some support arms 7 to the extension of screen cylinder 6 directions, is connected with rotor 8 between support arm 7 and screen cylinder 6 inwalls.Support arm 7 is provided with four groups, and every group of support arm 7 be an affixed rotor all, and the every group of support arm 7 that is oppositely arranged on power transmission shaft 5 excircles is on same straight line, and four groups of support arms 7 are the setting of equidistantly arranging along the excircle of power transmission shaft 5.

As shown in Figure 2, the cross section of the rotor of the end of rotor 8 is drops.

Screen cylinder 6 is slotted screen or hole sizer.Select different screen cylinders 6 according to different purposes.

As shown in Figure 1, the top of housing 1 sets out gas port 9.Be used for the gas in the discharge pressure sieve.

As shown in Figure 3, the top of housing 1 arranges dilution water import 11.

As shown in Figure 1, between screen cylinder 6 and the heavy slag capture tank 10 V-type capture tank 12 is set.Heavy slag capture tank 10 arranges valve 13.Stock inlet 2 arranges the slurry-inlet valve door.

Concrete: slurry stream enters pressurized screen inside with the tangent line of certain pressure 1 axial cross section from the pressurized screen bottom along housing by stock inlet 2 during pressurized screen work, and flow from bottom to top, because screen cylinder 6 Inner have certain pressure differential outward, the rotation of rotor 8 is again to the slurry important role in the screen cylinder 6 in addition, staple fibre is outflowed by sieve seam or sieve aperture rapidly, staple fibre and good slurry are discharged from the good slurry outlet 3 that is positioned at screen cylinder 6 outsides, the tail slurries such as bulk impurity and thick fiber can not be by sieve seam or sieve aperture, export 4 discharge pressures sieve from the tail slurry that is positioned at screen cylinder 6 tops, further screen, thereby finish primary screening.

Rotor 8 continues rotation, sieve seam or the sieve aperture place that short stock passes through crossed in the front portion of its traffic direction, form a gap between rotor 8 outsides and the screen cylinder 6 Inner surfaces this moment, the during this time poor increase of crack Inner flow rate of slurry, cross section is the fairshaped rotor structure of drops, this gap width is constantly changed, namely progressively narrowed by larger gap, then progressively enlarge again, in this course, the static pressure of slurry is converted into kinetic energy, and screen cylinder 6 Inner external differentials are close to zero at this moment, and slurry stops to flow, when slurry leaves rotor and screen cylinder 6 minimum clearance place, because the gap progressively enlarges, form negative pressuren zone at this position, namely screen cylinder 6 Inner pressure are lower than screen cylinder 6 external pressures, this moment, screen cylinder 6 outer good slurries were to 6 li punchings of screen cylinder, play a part to wash away the slurry that sticks on sieve seam or the sieve aperture, make screen cylinder 6 obtain flushing, avoid tail slurry fiber blocking screen seam or sieve aperture.

It should be noted that at last: above only is preferred embodiment of the present utility model, be not limited to the utility model, although with reference to embodiment the utility model is had been described in detail, for a person skilled in the art, it still can be stated scheme to the skill that aforementioned each embodiment puts down in writing and make amendment, and perhaps part technical characterictic wherein is equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the present utility model.

Claims

1. paper making pulp pressurized screen, comprise housing, it is characterized in that: described housing outer wall is provided with stock inlet, good slurry outlet and the tail slurry outlet that arranges along the housing tangential direction, power transmission shaft, rotor and screen cylinder are set in the described housing, described power transmission shaft drives rotor and rotates, and described rotor is positioned at described screen cylinder, and described good slurry outlet is positioned at the described screen cylinder outside, described tail slurry outlet is positioned at described screen cylinder top, and described screen cylinder below arranges heavy slag capture tank.

2. a kind of paper making pulp pressurized screen according to claim 1 is characterized in that: extend to described screen cylinder direction along the excircle of described power transmission shaft and be provided with some support arms, be connected with described rotor between described support arm and the described screen cylinder inwall.

3. a kind of paper making pulp pressurized screen according to claim 2, it is characterized in that: described support arm is provided with four groups, every group of support arm be an affixed described rotor all, the every group of described support arm that is oppositely arranged on the described power transmission shaft excircle is on same straight line, and described four groups of support arms are the setting of equidistantly arranging along the excircle of described power transmission shaft.

4. a kind of paper making pulp pressurized screen according to claim 1, it is characterized in that: the cross section of described rotor is drops.

5. a kind of paper making pulp pressurized screen according to claim 1, it is characterized in that: described screen cylinder is slotted screen or hole sizer.

6. a kind of paper making pulp pressurized screen according to claim 1, it is characterized in that: the top of described housing sets out gas port.

7. a kind of paper making pulp pressurized screen according to claim 1, it is characterized in that: the top of described housing arranges the dilution water import.

8. a kind of paper making pulp pressurized screen according to claim 1 is characterized in that: between described screen cylinder and the described heavy slag capture tank V-type capture tank is set.

9. a kind of paper making pulp pressurized screen according to claim 1, it is characterized in that: described heavy slag capture tank arranges valve.

10. according to claim 1 to the described a kind of paper making pulp pressurized screen of 9 any one, it is characterized in that: described stock inlet arranges the slurry-inlet valve door.