US2185567A - Emptying apparatus for diffusers, pulp bins, and the like for the manufacture of cellulose and paper - Google Patents

Description

Jan. 2, 1940. o QVILLER I 2,185,567

EMPTYING APPARATUS FOR DJ IFFUSERS, PULP BINS, AND THE LIKE FOR THE MANUFACTURE OF CELLULOSE AND PAPER Filid Oct. 27, 1937 2 Sheets-Sheet 1 1940- o. QVILLER 2.185.567

EMPTYING AIPARATUS FOR DIFFUSERS, PULP BINS, AND THE LIKE FOR THE MANUFACTURE OF CELLULOSE AND PAPER Filed Oct. 27, 1937 2 Sheets-Sheet 2 Patented Jan. 2, 1940 EMPTYING APPARATUS FOR omrusnns.

PULP ems, AND 'rna mm roa run MAN- UFAc'rUaE or CELLULOSE AND PAPER Olaf Qviller, Oslo, Norway Application October 21, 1937, Serial No. 171,396

8 Claims.

This invention relates to an emptying apparatus intended to be used in connection with diffusers, pulp bins and the like in the manufacture of cellulose and paper. It was formerly known 6 in such apparatus to use movable rinsing nozzles, some of which rinse-out pulp in the container in question at its bottom immediately above a bottom valve which serves to carry away the pulp diluted by water. According to the present inven'tion the rinsing water acts simultaneously to open the outlet for the pulp to be rinsed out, preferably in such manner that the rinsing water acts upon a piston which controls the pulp outlet. -Thls piston .can also be adapted to mainl5 tain the rinsing nozzles in a closed condition until the outletfor the pulp has been opened to a suitable degree. The outlet valve is shaped preferably as a bell which may surround a piston provided with one or more rinsing nozzles, the

m outlet openings of which are arranged in the periphery of the piston. The bell is connected with a piston in a'cylinder for water under pres* sure, so that this water in the cylinder has a v tendency to move the bell into closed position. 2 The cylinder has a constant connection with the water under pressure, for instance through a conduit in front of a stop cock which controls the supply of the water under pressure to the bell opening. The diameter of the piston cylinder is jg made (smaller than the interior diameter of the bell, whereby the opening movement of the bell is eifectedautomatically by the diiierence between the-forces on the bell and on the cylinder piston as soon as a cock in front of the appau'ratus is opened. The-arrangement may be so made that the piston for opening the pulp outlet isconnected with a stop device which preferably is in the form of a screw and may maintain the piston in the obtained adjustment even if the pis- 40 ton is leaking.

The invention is illustrated in the enclosed drawings, wherein,

Figure 1 shows avertical section of one embodiment and i I 45 Figure 2 shows a similar section of a second a. embodiment. A

In Figure 1 only one rinsing nozzle l is shown, but ,it will be understood that several nozzles may be used. These nozzles discharge at diflerent so points 01' the circumference of a piston 11 in the interior of a hell I which is movable downwards and co-operates with the piston and the loweredge 4 ol' which operates as a valve in connetion with a seat 5 in the bottom 8 of the dilfuser-or pulp so t'a'nkJromwhichthe pulpisto berinsedout and In Sweden December 7, 1936 and the side walls. of which extend upwards from the said bottom 8. Bell 3 may be opened or closed all according to requirements. In the bottom 6 of the tank as ordinary outlet 1 is arranged which, when the bell 3 has been lifted, lets out of water or diluted pulp into a side pipe 8, which conveys the pulp away.

The piston 2 is arranged at the upper end of a pipe 9 which is joumalled in a sleeve l0 arranged inside the outlet I and which pipe extends downwards as indicated'at -I I, in order to form a guide for a vertically movable bar l2a to the upper end of which the hell I is attached This bar extends downwards through the member II and intol a piston cylinder I2,' wherein it is attached to apiston l3 and is provided below the same with a somewhat thinner extension I4 projecting down into a lower small cylinder i5, and this lower reduced extension I4 is provided with a central bore It. The bore extends somewhat above the piston l3, and an open connection between the bore I6 and cylinder is established by a transverse bore in bar Ila, thus providing communia cation between cylinder l5 and I2. The pipe 9 is provided with side openings I! which are arranged in a housing It.

The housing It is connected with a conduit for water under pressure through opening I9.

Ill

The conduit is provided with a stop cock 2|. on

the outside of the stop cock the pipe 20 is, through a smaller pipe 22, in constant connection with the cylinder lb. The member H which forms the extension of the pipe 9, is fixedly connected with the wall 21 of the cylinder l2, said wall being provided at the outside with a worm wheel 23. The latter is keyed upon the outside of the cylinder wall 21 and can be put in rotation by means of a worm 24 driven by means of a suitable gearing from a Pelton motor 25. This motor obtains the water under pressure through a pipe 26 from the conduit 20 at the inside of the stop cock 2|. The operation is as follows:

When the cock 2i is closed, the water under pressure passes through the pipe 22 to the cylinder l5, and through the channel I it has an open access to the cylinder l2'and.the piston 13, so that the latter by the pressure is urged downwards and thereby maintains the bell 3 down upon the seat 8, so that the bottom outlet of the container in question is closed. Moreover the motor 25 is not rotating. But when the stop cock 2| is opened, the water under pressure obtains through 20, I9 and i1 access to the interior space of the pipe 9 and acts upon the hell 3 on a considerably larger area than the area of the piston l3. Consequently the bell 3 is lifted slowly' so that it opens the outlet I and after the lapse of some time also uncovers the nozzles I, so that the water under pressure passesthrough the latter out into the pulp enclosing the hell 3 and dilute the pulp by water, the outlet I having now also been opened. When the cock 2| is opened, also the motor 25 is started, so that the wheel 23 together with the cylinder 21 and pipe 9 with the piston 2 and the nozzles I are rotating slowly 'in order to eflect a uniform rinsing out of the Pulp.

As soon as the cock 2| is closed again, the upwardly directed pressure upon the bell 3 disappears, so that the pressure acting upon the piston i3 will again pull thebell 3 downwards a ainst the seat 5. In order to maintain the seat in a clean condition during the outlet of the pulp, the pipe 3 is provided at a point level with the seat with a small nozzle 28 which constantly passes rinsing water over the seat and thereby maintains it clean. The construction of the emptying apparatus described above is particularly adapted for emptying sulphate cellulose from difiusers.

Figure 2 shows a somewhat altered embodiment which is particularly adapted for use in connection with sulphite cellulose. In this embodiment the apparatus is mounted upon the upper cover 29 of a pulp bin, at the bottom ofwhich an outlet valve is arranged in similar 'manner as the valve 4, 5 in Figure 1. To raise and lower the valve body a central pipe 30 is used, which pipe extendsfrom the cover just down to the binbottom. This valve is not shown in the drawing since, per se, it is no part of thepresent invention. The pipe 33 is provided above the cover 23 with .a piston 3|. travelling in a cylinder 32. The water under pressure is passed as before to a conduit |9, it to the underside of the piston 3| and through openings I! also to the in-.

terlor of the pipe 30 in order to be spread out through nozzles immediately above the bottom valve in known manner.

The embodiment here shown does not close the bottom valve automatically, but may of course also be constructedior this purposein similar manner as shown in Figure 1. The cylinder 32 is provided at its upper part with an outlet 33 passing through a three-way cock 34 and may be connected through the latter with an empty- 8 P pe 35 and also with the conduit 36 for water under pressure.

on the upper. side of the piston 3| a bar 31 is attached which passes through the housing of the apparatus and through a sleeve 38. The bar 31 has at the top threads 39 for the threaded hub of a toothed wheel 40. The sleeve 38 is keyed to a worm wheel 23 which through the worm 24 is driven from the Pelton motor 25, so that the pipe 30 and thereby also the bottom valve body with rinsing nozzles are maintained in a slow rotation during the operation of the apparatus.

The pipe 30 is surrounded by a sleeve 4| and may rotate within same. Between the pipe 30 and the sleeve 4| is arranged an annular space 42 which at the upper part is in open connection with the housingl8 and at the lower part is connected through an inclined side pipe 43 with a rinsing nozzle 44 by means of a. flexible hose 45. The nozzle is turnable on a pivot 46 and provided with a side arm 4'! which through a link 43 is'connected with a sleeve 49 movable upon the pipe 4|. Through pivot and slot 50 the sleeve may be moved up and down by means of a? oscillating lever 5|. This lever is at'one end other end provided with a threaded sleeve I3,

wherein a screw works forming the lower end of a vertical bar 55 with an upper hand wheel 43..

When water under pressure is not supplied at I9, but only at 36 and when the three-way cock 34 is so adjusted as to connect 33 with 33, the water under pressure will act through 33, 34, 33 upon the upper side of the piston 3| and thereby press the pipe 30 with the bottom valve body downwards, so that the tank is closed. But when the water under pressure is supplied at I3, it acts upon the piston 3| and thereby raises the bottom ,valve and is simultaneously passed through the pipe 30 to the above-mentioned rinsing nozzles immediately at the bottom of the bin.

Simultaneously the water under pressure is passed through the space 42 to the nozzle 44 which by the hand wheelSG may be adjusted to the position most suitable for the purpose. so that a complete rinsing out of the pulp from the bin may be obtained. In order to enable the piston 3| to be pressed upwards without resistance, the cock 34 may be so adjusted that the top 'of the cylinder 32 is connected through 33 and 34 with an emptying pipe 35. However, nothing prevents the stop cock, which is presumed to be mounted before the inlet I3 in a similar manner as the cock 2| in Figure 1, from being'in mechanical connection with the threeway cock 34, so that it is moved into a position corresponding to the open and closed position of the stop cook. The pipe 36 may also be connected to the pipe for water under pressure for supplying such water in front 0! the stop cock in a similar manner as the pipe 22 in Figure 1. In such case the apparatus would operate quite automatically.

In the shown embodiment which is not intended to operate automatically, a hand wheel 43 is so used that, when the piston 3| has been pressed up into its upper position and has opened the bottom valve, whereby the wheel 43 has been raised correspondingly somewhat above the top of the sleeve 38, the hand wheel 40 is screwed down, so that the wheel hub engages the sleeve then is to be closed, it is only necessary to close the valve controlling the water under pressure at l9, and then by rotating the wheel 40 to lower the pipe 30 with the valve body.

I claim:

1. A discharge device for difiusers and the like in the manufacture of cellulose and paper, comprising a casing having an outlet, a bell forming a valve controlling the outlet,-means to supply water under pressure to the inside of the bell to actuate the bell for opening the outlet, a pivotal rinsing nozzle having an inlet connected with the water under pressure supplied to the bell and having an outlet controlled by the valve so as to be opened by the same during the valvelii'ting motion.

2. A discharge device for diffusers and the like in the manufacture of cellulose and paper, com- ..prising a casing having an outlet, a bell forming a valve controllling the outlet, means to supply water under pressure to the inside of the bell to actuate the bell for opening the outlet, a piston surrounded by the bell so as to close the interior I 9,185,567 of the bell top from the bell edges and operating as a valve body, a rinsing nozzle mounted in the piston and having an 'inlet connected with the water under pressure supplied to the interior of the bell and havng an outlet controlled by the bell so as to be opened by the same during the bell lifting motion. I

3. A discharge device for difiusers andthe like in the'manufacture of cellulose and paper, comprising a casing having an outlet, a bell forming a valve controllling the outlet, means to supply water under pressure to the inside of the'bell to actuate the bell for opening the outlet, a piston surrounded by the bell so as to close the interior of the bell top from the bell edges and operating as a valve body, a rinsing nozzle mounted in the piston and having an inlet connected with the water under pressure supplied to the interior of the bell and having an outlet at the periphery oi! the piston controlled by the bell so as to be opened by the bell during the bell lifting motion.

4. In a discharge device according to claim 3, means for moving the bell to closed position,

including a cylinder for water under pressure, a

piston in said cylinder connected with the bell so as to tend to move the bell to valve closing piston by the water under pressure acting on said piston.

5. In a discharge device according to claim 3,

' and means for moving said bell to closed posi tion, including a cylinder, means for constantly connecting said cylinder with water under pressure, a piston in said cylinder connected with the bell so as to tend to move the bell to valve closing piston by the water under pressure acting on said piston, said piston having a smaller diameter than the bell, and closeable means to put the bell top interior in connection with the said water supply. l

6. In a discharge device according to claim 2,

means for rotating the bell piston with the rinsing nozzle slowly about the piston axis.

7. In a discharge device according to claim 2, a motor operable by water .under pressure, a gear inserted between the motor shaft and the bell piston to rotate same with the rinsing nozzle slowly about the axis of the piston.

8. In a discharge device according to claim 1, a seat for the valve, and a rotating rinsing nozzle directed against said valve seat so that'the water jet from the nozzle outlet sweeps and thereby rinses said valve seat.

OLAF QVILLER.

Images