US1731447A - Transporter - Google Patents

Description

Oct. 15, 1929. I w. H. VOGEL TRANSPORTER Filed June '16, 1927 Patented a. 15, 1929 UNITED STATES PATENT OFFICE.

wnnrm n. VOGEL, or -mermaND rm, minors, nssrenon To INTERNATIONAL comBUs'rIoN ENGINEERING CORPORATION, 01- NEw Yon'x, N. 1., A. coaromrron OF DELAWARE Application med June 16, 1921. Serial Io. 199,164.

i This invention relates to apparatus for transporting finely divided materials such, for example, as pulverized coal.

The invention has to do with that class of transport apparatus in which the material is transported through a lineby air under compression, the material being fed from a suitable source of supply to the sphere of action of the pneumatic pressure by means of a feed screw.

In this-class of apparatus blowing bac "of the air is to be prevented, and a number of difi'erent arrangements have been heretofore proposed for this purpose. In many instances, however, the desired result canonly be obtained with heavy power consumption, and it is one of the primary objects of my invention toprovide an effective transport device in which the power consumption is relatively small.

7 Another object of the invention'is to vide a feeder for a transport system which is. simple and economical to manufacture and which can be readily 2 operating condition.

How the foregoing, together with such maintained-in effective other objects and advantages as may hereinafter appear, or are incident to my invention, are realized is illustrated in the accompanying drawings, wherein- Fig. 1 is a side elevation in partial section through a transport feeder embodying my mvention;- 7

Figs. 2 and 3 are, respectively, a side and end elevation of one of the units from which the feed screw is built up, and

Fig. 4 is an end elevation of the means provided to prevent blow back of the air. I

Referringnow to the drawings, the reference character A denotes the feeder barrel having an inlet B to receive the material to be transported. The feed screw is indicated at C. Secured over the discharge end of the barrel is a connection D for delivering the material discharged from the screw into the conveyor line E, Powdered coal enters the inlet B from any suitable source of supply through the throat F, and it is'advanced through the barrel by the screw to the sphere of action of the compressed air. .The comscrew. The provision ,of the disk, however,

pressed air for transporting the coal is admitted to the air chamber 7 at the end of the barrel through the pilpe 8, and it discharges into the connection through a plurahty of ports or openings 9 arranged annularly of the dischar e end of the barrel.

The screw 5 is mounted on the shaft 10, and at the end of the screw and within the discharge end of the barrel I provide a seg-' mental disk 11 which rotates with the shaft and screw. In the preferred form of my invention this segmental disk is semi-circular, i. e., it is a half disk, and it is carried on a sleeve-like portion 12 fitting. the shaft and keyed thereto. The disk'extends' transverse-' ly of theaxis of the shaft preferably at right angles thereto, and the end of the thread terminates adjacent the edge of the disk; The screw preferably has a thread of constant pitch, but the disk has the eifect of decreasing the capacity of the last flight of the screw with respect to the other flights.

Under regular operating conditions the apparatus functions substantially as follows. The screw is rapidly revolved and advances the coal entering the inlet end of the barreL. Usually the lea flights of the screw do not run full, for e reason that a portion of the coal is rejected because of the centrifugal action of the rapidly revolving causes the last flight or so of the screw to become filled with coal particles sufliciently densely as to prevent the 'air from blowing back. The air admitted through the ports 9, therefore, operatesto tra rtthe coal discharged from the end of the arrel into the connection D through the line. I have found it very eifcctive to deliver the air around the coal discharging from the By making the and 1ts sleeve 'separately from the screw, I simplify manufacture and am also enabled to replace the disk if it should wear more rapidly than the screw. For substantially the same reasons, I

refer t6 make up the screw out of a numr of elements which are complementary and preferably counterparts of one another. These elements each comprise a sleeve-like portion 13 having a shoulder 14 at each end and carrying a half thread 15, the ends of which terminate at the shoulders. From an inspection of Fig. 1 it will be seen that. these elements can readily be assembled in the form of a screw, the elements being nonrotatably associated with the shaft by any preferred means,such as the locking bolts 16.

A screw of any desired length can be made up from these elements, and if any portions of the thread wear more rapidly-than others, the same can be readily replaced.

Reverting to the. power requirements of the transporter, I have found, by experience, that the provision of the disk enables me to effectively prevent blow back, while, at the same time, the power required for turning the screw is relatively small. This is probably attributable to the fact that only the vlast flight or so of the screw becomes completely filled. I have also found that the transporter is economical of air and is able to transport for long distances with relatively low air pressures. I also find that I am enabled to use a shorter screw than has heretofore been required.

As the form'of the disc 11 may vary according to the material being transported, it is to be understood that the term segmental disc is to be liberally construed, that is, it is intended to mean discs which are semicircular, less than or more than semicircular.

I claim 1. A pneumatic transport device for transporting pulverized coal or other finely divided material comprising a barrel having an inlet, a feed screw in said barrel, a segmental disc at the end of said screw, and means for admitting conveying air beyond said disc.

2. A pneumatic transport device for transporting pulverized coal or other finely divided material comprising a barrel having an inlet,-a feed screw in said barrel, a segmental disc at the end of said screw, a discharge connection from the barrel to a conveyor line, and means for supplying conveyinlg air to said connection.

3. pneumatic transport device for transportin pulverized coal or other finely divided material comprising a barrel havin an inlet, a feed screw in said barrel, a su stantially semi-circular disc at the end of said screw and extendin transversely of the axis of said screw, and means for admitting conveying air beyond said disc.

4. -A pneumatic transport device comprising a barrel having an inlet and discharge opening, a shaft extending through said barrel, a screw. on said shaft com osed of complementar interlocking mem ers each carrying hal a screw thread, said members heing assembled end to end on the shaft, a

segmental disc member at the end of said 05 screw' complementary to the end member of the screw, and means for admitting conveying air beyond said disc member.

5. A pneumatic transport device comprising a barrel having an inlet and. discharge opening, a shaft extending through said barrel, a screw on said shaft composed of complementary interlocking members each rel, a screw on said shaft composed of complementary interlocking members each being composed of a hollow body portion with a shoulder at each end andcarrying ahalf screw thread with its ends terminating at the shoulder, a segmental disc member at the end of said screw complementary to the end member of the screw, and meansfor admittinIg conveying air beyond said disc member. n testimony whereof I'havehereunto set In hand. V

y WILLIAM'H. VOGEL.

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