US3145936A - Pulping apparatus - Google Patents

Description

Aug. 25, 1964 w. w. MONKS PULPING APPARATUS Filed May 29, 1961 IN V EN TOR. VVzZZz'awz WWII/9 BY ,gzzw %4 H77 VJ United States Patent 3,145,936 PULPING APPARATUS William W. Monks, Pittsfield, Mass, assignor to E. D. Jones Corporation, Pittsfield, Mass, a corporation of Delaware Filed May 29, 1961, Ser. No. 113,303 Claims. (Cl. 241-46) This invention relates to defibering apparatus of the type described and claimed in Patent 2,756,646, granted July 31, 1956, to Dwight E. Jones, which has a rotor tapered toward its free end and circulating fins on its tapered periphery. It has been found that the aforesaid end becomes plastered with large pieces of pulp which not only decreases the circulation of material but results in the aforesaid pieces not being properly defibered. Thus when the plastered pulp is disengaged at a later stage of the pulping cycle it mixes with the defibered pulp and produces a mixture which is not uniformly defibered. Moreover the mass of plastered pulp sometimes falls off while emptying the tank and plugs the drain.

Objects of the present invention are to prevent the aforesaid plastering, to produce uniform defibering throughout each batch of material, to avoid the necessity of stopping the apparatus to remove plastered material, and to process pulp continuously without danger of plastering.

In one aspect of the present invention the free end of the rotor is provided with a protuberance and surrounding the protuberance is a spiral vane which progresses toward the outer end of the protuberance in the direction opposite to the direction of rotation. Preferably the axial protuberance is tapered toward its outer end and the vane gradually increases in width toward the outer end. Thus instead of the material being plastered on the face of the rotor it is maintained in circulation.

In another aspect of the invention the rotor is tapered toward its free end and the aforesaid fins are fast to its tapered periphery, and the aforesaid spiral vane extends axially from the free end of the rotor, the spiral progress ing in the direction opposite to the direction of rotation so as to pump material away from the free end of the rotor.

For the purpose of illustration a typical embodiment of the invention is shown in the accompanying drawings in which FIG. 1 is a plan view of a portion of a pulping tank;

FIG. 2 is an elevation of the aforesaid rotor viewed to a line 22 of FIG. 1; and

FIG. 3 is a section on line 3--3 of FIG. 2.

In the illustration 1 is the pulping tank and 2 is the aforesaid rotor, corresponding to the parts 2 and 8 of the aforesaid patent. The rotor is driven in the direction of the arrow 3 in FIG. 2 by means of a shaft 4 and belt 5.

According to this invention the outer periphery 6 of the ice end of the protuberance in a direction opposite to the direction of rotation, and the width of the vane gradually increases from its inner end 10 to its outer end 11. As shown in the drawings the fins 7 are wider and longer than the fins 7.

From the foregoing it will be understood that the vane 9 serves as a reverse screw which causes the pulp to flow away from the base of the rotor instead of being plastered thereon.

It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equivalents which fall within the scope of the appended claims.

I claim:

1. In a machine for pulping material, a rotor having a free end and outwardly projecting fins to produce circulation of material away from the axis of the rotor, and a spiral vane extending axially from said end, the spiral progressing in the direction opposite to the direction of rotation from the rotor toward the tip of the vane so as to tend to pump material away from said end along said axis.

2. In a machine for pulping material, a rotor to circulate the material, the rotor having peripheral fins and an axial protuberance, and a spiral vane around the protuberance, the spiral progressing toward the outer end of the protuberance in the direction opposite to the direction of rotation.

3. In a machine for pulping material, a rotor to circulate the material, the rotor having peripheral fins and an axial protuberance which is tapered toward its outer end, and a spiral vane around the tapered protuberance, the spiral progressing toward said end in the direction opposite to the direction of rotation.

4. In a machine for pulping material, a rotor to circulate the material, the rotor having peripheral fins and an axial protuberance which is tapered toward its outer end, and a spiral vane around the tapered protuberance, the spiral progressing toward said end in the direction opposite to the direction of rotation and the vane gradually increasing in width toward said end.

5. In a machine for pulping material, a rotor to circulate the material, the rotor being tapered toward one end and having outwardly projecting fins on its tapered periphery, and a spiral vane extending axially from said end, the spiral progressing in the direction opposite to the direction of rotation from the rotor toward the tip of the vane so as to tend to pump material away from said end along the axis of the rotor.

References Cited in the file of this patent UNITED STATES PATENTS 2,434,449 Wells Jan. 13, 1948 2,756,646 Jones July 31, 1956 3,035,781 Wallen May 22, 1962 FOREIGN PATENTS 190,786 Austria July 25, 1957 602,511 Canada July 26, 1960

Claims (1)

1. IN A MACHINE FOR PULPING MATERIAL, A ROTOR HAVING A FREE END AND OUTWARDLY PROJECTING FINS TO PRODUCE CIRCULATION OF MATERIAL AWAY FROM THE AXIS OF THE ROTOR, AND A SPIRAL VANE EXTENDING AXIALLY FROM SAID END, THE SPIRAL PROGRESSING IN THE DIRECTION OPPOSITE TO THE DIRECTION OF ROTATION FROM THE ROTOR TOWARD THE TIP OF THE VANE SO AS TO TEND TO PUMP MATERIAL AWAY FROM SAID END ALONG SAID AXIS.

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