JPH059559B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application Centrifugal cleaners have been used in the paper industry for many years to remove small particles with a specific gravity greater than that of the paper fibers from slurries of papermaking fibers, particularly waste stock, and this book describes The invention relates to centrifugal cleaners.

Prior Art In centrifugal cleaners used for this purpose, hereinafter referred to as "prior art centrifugal cleaning technology", the outlet at the top of the conical container is relatively small compared to the inlet hole and the receiving outlet; For example, in a conventional centrifugal cleaner that is 3 inches in diameter, the other two ports are 1/8 inch in diameter compared to 5/8 inch in diameter. Accordingly, in such conventional cleaning operations, the reject flow through the top outlet is correspondingly small compared to the accept flow, for example 3% and 97% by volume, respectively.

PROBLEM SOLVED BY THE INVENTION Relatively recently, the separation of fine paper fibers from contaminants having a specific gravity very close to or lower than this and not easily separated by conventional centrifugation techniques has been developed. Therefore, the use of centrifugal cleaners is increasing.

Generally, these "reverse" centrifugal cleaners differ in structure and/or operation of conventional cleaners by allowing lightweight materials to pass through the proximal (apical) outlet, which is the acceptor outlet in conventional centrifugal cleaning, and to be ejected as rejects. The fibers were deformed so as to cause the quality fibers to be discharged as a stream of receiver material through the outlet at the top end. Reference may be made to US Pat. No. 4,155,839 for a detailed discussion of the development of conventional reverse centrifugal cleaning to date.

Means for Solving the Problems One principal object of the present invention is that the cleaner has two part outlet holes for separating the feed stream, both of which are located near the top of the cleaner, which is contrary to the prior art. An object of the present invention is to provide an improved centrifugal cleaner particularly suitable for performing reverse centrifugal cleaning without reversing the flow in cleaners as has been done heretofore for cleaning.

In order to achieve the above object, the present invention has a structure that includes a cylinder surrounding a truncated conical internal space and having an open top end with a predetermined diameter substantially smaller than the maximum diameter of the internal space. a main container shaped like;
Adjacent to the other end of the main container for introducing papermaking stock into the interior space is an inlet hole into the interior space, which produces an essentially circumferential flow component when the stock is introduced into the interior space. A stream for separating a paper stock by swirl separation into an external stream containing mostly paper fibers and an internal stream containing mostly light contaminants with a specific gravity similar to or smaller than the paper fibers. a housing including an inlet aperture, a chamber fixed to and in communication with the apical end of the main vessel, and an outlet aperture from the chamber; an outer diameter smaller than the open apex of the main vessel; a tube having an outlet;
support means for axially moving the tube within the housing substantially coaxially with the top end of the main container; the other end of the tube is of sufficient length to protrude through the support means into the exterior space of the housing to provide a handle for rotation and retraction; one end of the tube is inserted inside the top end of the main container; a fixing means for fixing the tube to the support means; and a fixing means for fixing the tube to the support means; and a predetermined outer diameter of one end of the tube that is sufficiently smaller than the inner diameter when inserted into the open top end of the main container; An annular outlet hole is formed capable of directing and receiving a flow of the outer part containing paper fibers into the chamber from a frusto-conical inner space having a flow area substantially larger than the flow area, and the flow from the tube is directed into the chamber. an outlet hole for causing the flow to flow as an internal stream containing less light contaminants than the outlet hole, thereby temporarily retracting one end of the tube axially from the top into the chamber; The fixing means is configured to release the fixing means from the support means so as to release the top end of the contaminants trapped in the annular outlet hole and expel the contaminants from the main container into the chamber without interfering with the operation of the cleaner. , which features a centrifugal cleaner for separating papermaking fibers from contaminants of similar or lesser specific gravity.

More specifically, in the cleaner or reverse centrifugal cleaner according to the present invention, the apical outlet used as an outlet for the "heavy parts", which is the reject in conventional cleaning or the acceptor in reverse centrifugal cleaning, is replaced by the lighter part, which is the reject. Use as a partial outlet. The cleaner of the invention is provided with a second outlet in its side wall, in particular at the downstream end of the internal conical section of the cleaner, which outlet constitutes the flow of the receptacle in this case in reverse centrifugal cleaning. This is the heavy part.

OPERATION Accordingly, in practicing the present invention, the feed is flowed from the proximal end of the cleaner to the top end, rather than flowing back into the central portion of the cleaner as in prior art reverse cleaning. This feature is particularly valuable when the invention is applied to cyclone assemblies or "canister" type cleaners, where several individual centrifugal cleaners are combined in parallel relationship within one common canister. and inside this common canister all the individual cleaner inlet and outlet holes and the feed chambers connected to these respectively,
It is divided into an acceptor chamber and an rejector chamber.

One unique feature of the invention lies in its combination with the structure of the outlet for the lighter components in the stock slurry, which outlet for the heavier components from the cleaner body is obstructed within the cleaner. A tube is provided that is releasably locked so that it can be temporarily retracted to release the blockage in the event of an accident.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical reverse centrifugal cleaner, generally designated 10, is housed in a casing 11. The interior of the casing 11 is separated by partitions 12 and 13 into a supply or feed chamber 15 at one end of the casing 11.
is divided into a reject chamber 16 at the other end of the casing and a receptor chamber 17 located between these chambers 15 and 16, each of which has a mouth hole 20 and 2.
1 and 22 are provided.

The cleaner 10 includes a tubular main container 25, the interior of which is cylindrical over a portion of its length and frustoconical over the remainder. An end housing 26 is threaded onto the small diameter end of the main container 25 and a tubular tip piece 27 is fitted with a retaining nut 28 as shown.
is fixed within the housing 26 by. A cylindrical interior space or lumen 29 within tip piece 27 forms an extension of housing 26 to outlet aperture 30 .

The housing 26 has one or more radially or tangentially arranged outlet holes 31.
, and a waste chamber 1 is provided across the outlet hole.
The total flow area is larger than the total flow area of the mouth hole 30 extending into the interior of the hole 6. housing 2
The lower end of 6 is closed by a screw cap 33,
This screw cap 33 is attached to the end wall 3 of the casing 11.
4 and is fastened to the casing wall near the end of the housing 26.
A plug 35 is provided at the proximal end of the main container 25 which screws into the proximal end of the main container 25 and clamps the partition 12 between itself and the main container 25.

A helical groove 40 provided on the outer surface of the plug 35 forms an inlet hole into the interior of the main container 25 of the cleaner, and the groove 40 has a helical shape so that the stock to be cleaned flows into the feed chamber 15. The main container 25 has a substantially circumferential component and is fed from the inside of the main container 25 to the inside of the main container 25. The plug 35 is otherwise solid but includes a cylindrical extension 41 at the inner end;
This extension serves in part as a eddy current detector and in particular as a stabilizing means for the air core that forms during operation of the cleaner. If desired, two grooves 40 can be provided on the outer periphery of the plug 35 to increase the effective size of the inlet hole.

In addition to the outlet holes 30 at the top end, the cleaner 10 is provided with one or more outlet holes 44 at the lower end of the frusto-conical portion of the main container 25. The outlet holes 44 are preferably arranged tangentially to the main container 25 and in the same direction as the circulation movement of the stock within the main container. The tip piece 27 preferably includes a cylindrical extension 45 that overlies the outlet hole 44 at least radially upstream from the tip piece into the interior of the main container 25;
Therefore, it protrudes to the extent that it acts as a baffle plate to prevent the paper stock from flowing directly into the tip piece 27 from the outlet hole, and the upper end of the extension part 45 prevents the paper stock from flowing directly into the top end of the main container 25. Forms an exit hole.

The structure of the inlet shown in Figure 1 prevents wear of the inner wall surface by swirling the heavy particle components at the inlet end of the cleaner, and most of the components flow in the length direction of the cleaner. It has a particular advantage in that it allows for continuity. However, the present invention can also be practiced with a modified inlet structure as shown in FIG.
It is almost the same as that shown in No. 4155839. Second
In the illustrated example, the inlet includes a plug 35' which differs from plug 35 only in that it does not have a groove 40 on its outer surface. Instead, a rectangular inlet hole 40'
The main container 25 as shown in U.S. Pat. No. 4,155,839.
extends tangentially to the wall. Therefore, main container 2
The position of the partition 12 relative to the inlet hole 4
0' must be moved so that it is open to the feed chamber 15, and the partition 13 is connected to a shoulder 46 of the main container 25' and a nut 47 facing this shoulder 46 and screwed around the main container. It is clamped in between.

When using the cleaner having the structure described with reference to FIGS. 1 and 2, the paper stock slurry to be cleaned is introduced into the feed chamber 15 at an appropriate pressure into the inlet hole 4.
0 or 40' at a desired flow rate and rate as described in U.S. Pat. and an innermost air core.
Said outer portion flows down the internal frusto-conical section of the main container 25 until it reaches the outlet hole 44 and is then discharged through the outlet hole 22 of the receiving chamber 17. The inner portion enters the lower end of the extension 45 and also passes through the interior of the tip piece 27 and the outlet hole 30 to the waste chamber 16 and its outlet hole 21.
and move to.

The separation of the heavy and light portions that form within the cleaner as it is discharged from the cleaner is achieved by directing the respective discharge streams from the reject material 16 and acceptor material 17 to conduits 52 extending from the outlet holes 21 and 22. ，
It can be easily controlled by adjusting means such as valves 50 and 51 provided at 53.

To confirm the proper separation of the flows from the two chambers, experiments are generally carried out which vary depending on the nature of the stock being fed, the feed flow rate and the feed pressure.
1 receptor chamber per approximately equal flow from both chambers
Satisfactory results were obtained by changing the separation conditions from 7 to about 90% and from reject chamber 16 to about 10%.

As a further specific example of practicing the present invention, tests were conducted using a cleaner of the construction shown in FIG. The minimum flow area of the outlet holes was 0.785 square inches, and the two outlet holes 40 each had a flow area of about 0.25 square inches. Satisfactory results were obtained with a feed flow rate of 50 gallons/minute at a pressure of 30 p.sig, with flows from reject chamber 16 and acceptor chamber 17 of approximately 26 gallons/minute and 24 gallons/minute. The delivery pressure was set to 40 p.sig, the delivery flow rate was set to 68 gallons/minute, and each chamber 1
6 and 17 respectively at 54.5 gallons/minute.
Even better results were obtained with a flow rate of 13.5 gallons/minute.

The present invention also uses a cleaner having the structure shown in FIG.
The minimum flow area of the top orifice is 0.306 square inches, and the receiving chamber orifice 44 is similar to the inlet hole 40' shown in FIG.
Tests were conducted using a 3/8 inch dimension with a flow area of 0.47 square inches. Delivery flow rate to 80 gallons/
Very satisfactory results were obtained with a delivery pressure of 45 p.sig and flows from chambers 16 and 17 of 8.5 gallons/minute and 71.9 gallons/minute, respectively.

As previously pointed out, the present invention is applicable to a canister type cleaner assembly having inner walls 61, 62 dividing the interior of the canister 60 into a central chamber 63 and end chambers 64, 65 as shown in FIG. Particularly suitable for Multiple cleaners 10 of the construction described in connection with FIG. It also has a partition function.

The operation of the canister type cleaner of the present invention shown in FIG. 3 is similar to that described in connection with FIG. Chamber 64 acts as a feed chamber and is provided with a suitably positioned inlet for receiving the incoming flow of feed stock, and chambers 63 and 65 each receive reject material as described in connection with FIG. It becomes a chamber and a receptor chamber. Further, a second set of partition wall and cleaner is provided by placing the canister-type cleaner shown in Fig. 3 facing the partition wall and cleaner set shown in Fig. 3, and then a second set of partition wall and cleaner is provided for both sets of cleaners. By using chamber 64 as a feeding chamber, the length of the canister can be reduced by 2
It is important to note that by doubling it, you can do it on both sides.

The variant cleaner 100 shown in FIG. (heavy part) chamber 117. Each of these chambers is provided with an inlet hole 120 and an outlet hole 121, but each cleaner 100 has its own inlet hole 120 and outlet hole 121 for rejects (light parts) from the casing 110 fed by a tube 123, which will be described in detail below. It has an outlet hole of.
Cleaner 100 has a tubular main container 125 that is generally similar in construction to container 25 except that it is somewhat elongated at the top and has no outlet hole in the side wall. An end housing 126 is threaded around the smaller end of the main container 125 in a tight relationship with the partition 113, which also serves as a mounting means for the tube 123, which also serves as an attachment means for the tube 123 to carry light from the cleaner. Equipped with a partial outlet hole. A guide member 131 within the housing 126 provides support for the tube 123 and has an axial bore 132 dimensioned to freely accommodate the tube 123 therein. The outer portion of the tube 123 passes through a central hole in a threaded cap 133 which connects the end of the housing 126 to the casing 11.
0 end head 111.

The axial hole 132 of the guide member 131 has an O-shaped hole sized to form a seal between the axial hole 132 and the tube 123.
A circumferential groove is provided to accommodate the ring 135. Furthermore, releasable locking means are provided between the tube 123 and the guide member 131. That is, it is used as a vennet type locking means for the tube 1.
23 and dimensioned to cooperate in a locking relationship with the slot and grooved portion at the outer end of the tube 123, comprising a radial protrusion 136 providing means for securing the tube 123. As shown, protrusion 13
6 is lined up with the slot 137 at the end of the guide member 131, and when the tube 123 is inserted into the member 131, the protrusion 1
36 are seated at the bottom of these slots and then tube 1
23 by a quarter turn to lockingly engage the protrusion 136 in the groove 138. The inlet hole into the interior of the main container 125 is formed by an inlet hole 140 consisting of one or more tangential slots in the rectangular shape of the wall of the main container near the proximal end closed by a threaded plug 142. has been done. An extension 141 of plug 142 serves both as a eddy current detection means and as a stabilizing means for the air core that forms during operation of the cleaner, and this extension may be solid as shown or as shown in FIGS. 1 and 3. A hollow cylindrical shape may also be used.

The protrusion 136 provided on the tube 123 is spaced at a predetermined distance from the inner end of the tube 123, so that the protrusion 136
6 is locked into the groove, the inner end of the tube is connected to the main container 1.
An annular outlet hole 14 is positioned from the top end of the tube 25 to an annular chamber 145 positioned therein and which surrounds the tube 123 from the interior of the main container on the upper side of the guide member 131.
form 4.

The cleaner assembly shown in FIG. 4 is substantially similar to that described in connection with FIG. It pivots apart into an inner part and an inner part which is discharged through pipe 123. A significant advantage provided by this cleaner is that if the annular outlet hole 144 is blocked by solids, the flow of stock from outside the casing 110 can continue through the tube 123 for a sufficient period of time to flow past the top of the main vessel. and then move the tube 123 through the protrusion 136-
This is done by returning it to the operating position by locking the groove 138.

Advantages of the invention In order to take advantage of this advantage of the invention, cleaner 1
00 into one casing 110, all the pipes 123 are made to protrude outside the canister,
Each tube is provided with a flexible tube 150 which directs waste from the tube to a common collection receptacle. To remove the blockage and enable use of the tube 123, each tube 123 has a tube 150 secured to it as a handle or by a clamp 151 which twists the corresponding tube 123 from the locked position to the unlocked position. All you have to do is move it back temporarily and then return it to the working position and lock it.

In the typical example of the cleaner shown in Figures 4 and 5, the cylindrical portion of the main container has an internal diameter of 3 inches;
The top end of the main container has an inside diameter of 1.4 inches, and the end housing has four 1 inch diameter ports 146. Tube 123 has an outside diameter of 0.625 inches.
The tube 123 preferably has an inner diameter of 0.500 inches and is chamfered on its upper side to minimize turbulence in the flow therethrough. Furthermore,
The space between the inner end of threaded cap 133 and the distal end of guide member 131 allows for at least one inch of axial movement of tube 123, and
The top end of the main container 125 can be completely opened when the main container 23 is retreated.

Although apparatus has been described which constitutes a preferred embodiment of the invention, it is to be understood that the invention is not limited to this precise form and may be modified in various ways without departing from the scope of the invention.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a cleaner according to the present invention, FIG. 2 is a partial vertical cross-sectional view showing a deformed inlet hole, and FIG. 3 is a partial vertical cross-sectional view showing an example in which the present invention is applied to a canister-type cyclone cleaner. 4 is a longitudinal sectional view showing a cleaner incorporating a modified tube for light parts; FIG. 5 shows details of the mechanism for releasably locking the cleaner tube shown in FIG. 4; FIG. FIG. 2 is a cut away isometric perspective view. 10,100...Cleaner, 11,110...Casing, 12,13,113...Partition, 16,1
45...chamber, 20,120...feeding means, 21,2
2,121...Discharge port hole, 25,125...Main container,
26,126...Housing, 31,144...Outlet hole, 123...Pipe, 40,140...Inlet hole, 1
31...Supporting means, 136...Fixing means, 151...Handle.

Claims (1)

[Scope of Claims] 1(a) A cylindrical main container surrounding a frustoconical interior space and having an open top end with a predetermined diameter substantially smaller than the maximum diameter of the interior space; (b) an inlet hole adjacent to the other end of the main container for introducing papermaking stock into the internal space, the inlet opening into the internal space being substantially circular when the stock is introduced into the internal space; A circumferential flow component is created by the swirl separation of the stock, resulting in an outer part of the flow containing mostly paper fibers and an inner part containing mostly light contaminants with a specific gravity similar to or lower than that of the paper fibers. (c) a chamber fixed to and open at the top end of the main container, the chamber being axially aligned with and communicating with the top end, and an outlet hole from the chamber; (d) a tube having an outlet having an outer diameter smaller than the open top end of the main vessel; and (e) a tube within the housing substantially coaxially with the top end of the main vessel. (f) support means for axial movement of the tube; (f) the tube is such that when one end of the tube is inserted into the open top end of the main container, the other end of the tube (g) having a length sufficient to extend through the support means into the external space of the housing to provide a handle for rotation and retraction; (h) a fixing means for inserting and fixing the tube to the support means; (h) an outer diameter of the one end of the tube is substantially larger than its inner diameter when inserted into the open top end of the main container; an annular shape having a small predetermined outer diameter and having a flow area substantially larger than the flow area through the tube for directing and receiving the flow of the outer portion containing the paper fibers from the frusto-conical inner space into the chamber; an outlet aperture forming an outlet aperture of the tube and causing flow from the tube to flow within the interior containing less of the light contaminants than the outlet aperture; (i) said contaminant being trapped in said annular outlet hole without temporarily retracting one end of said tube axially from said top end into said chamber thereby interfering with the operation of the cleaner; The fixing means is released from the supporting means in order to release the top end from the main container and expel the paper into the chamber. Centrifugal cleaner for separation from objects.