US1821665A

US1821665A - Dust collector mechanism

Info

Publication number: US1821665A
Application number: US73582A
Authority: US
Inventors: William B Prouty
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-12-07
Filing date: 1925-12-07
Publication date: 1931-09-01
Anticipated expiration: 1948-09-01

Description

Sept. l, 1931. w. B. PRouTY 1,821,665

DUST COLLECTOR MEcHANIsu Filed Dec. 7, 1925 2 Sheets-Sheet 1 Sept. l, 1931. w. B. PRouTY DUST COLLECTOR MECHANISM Filed Dec. 7. 1925 2 Sheets-Sheet 2 0 w s 0 r v/ @l h P m m I. I Il rJl Il Il .0. BM 4 r m ma w M M 7/ mo M a n, U u M ,w n 4 ...w n f Lil lili n m y -L m l. .Il i i. w l xk 2 y f Patented Sept. l, 1931 WILLIAM .'B. PROUTY, OF EVANSTON, ILLINOIS DUST COLLECTOR MECHANISM Application led December 7, 1925. Serial No. 73,582.

, This invention relates in general to a system for grinding or pulverizing and col.- lecting the properly ground material and more particularly to the dust collecting 3 mechanism thereof.

One of the objects of the invention is the provision of a new and improved dust collector with new and improved means for introducing the air thereto and removing the same therefrom. 3

Another Aobject ofthe invention is the provision of new and improved means for ventin the collector for relieving the pressure t erein with a minimum loss of 16 material.

A further object of the invention is the provision of a novel collector with new and improved means Yfor causing the air delivered to'the same to rotate about the vertical axis of -th'e collector during' the operation of the system. E

A still further object of the invention is the provision of a. new and improved collector ,that is. cheap to manufacture, easily assembled and installed, eicient in operation, exceedingly simple in construction, and that is not likely to become deranged or get out of order. l

Other and further objects and advanta es so of the invention will appear from the ollowing description taken in connection with the accompanying drawings, in which Fig. 1 is an elevation of aportion of a building showing the invention in osition x5 therein, with parts in section an broken away; l

F ig.` 2 is a side elevation ofthe collector on an enlarged scale, with parts broken away;

Fig. 3 is a plan view thereof;

Fig. 4 is a section on line 4 4- of Fig. 1, shown more orless diagrammatically and looking in the direction of the arrows; and

Fig. 5 is a side elevation of a separator .6 showing a modified -form of means for supplying air thereto. y On the drawings the reference character 10 designates a building comprising the lower floor 11, the roof 12,"and the iloors or supports 13 andl4.

parts The invention is shown as being employed in a system in which a single separator and a single collector are employed, but it is understood that this disclosure is by way of example only, as the arrangementl may beA otherwise.

As shown, the system comprises a mill 15 for grinding the material, an air conveyor 16, a dust separator 20 for separating the coarser material or rejects and returning them to the mill to be reground, a fan 17 for operating the system, a transfer conduit 19, a dust collector 21 for removing the ground material from the air, and a return pipe or air conduit 22 for delivering 65 the air from the collector into the air conveyor 16. The mill 15 for grinding or pulverizing the raw material delivered thereto may be of any approved construction. The same `is operated by any convenientv means as thev motor 23. The raw material is supplied to the mill by a conduit 24 from any suitable source of supply, as is usual in such constructions. The ground material is delivered into the lower portion of the pipe or conveyor 16 and is elevated to the separator 20 through said conduit by an air current induced by the suction of the fan 17.

The air conveyor 16 is provided at its so lower end with a gravity valve 25 normally held in closed position b a weight26 adjustable along an arm 2 rigidly mounted on the gravity valve 25. r1 he valve is adapted to be o ened by the wei ht of materlal that may, or any reason, coect in the ipe or conveyor 16 during the operation oy the system. The valve 25 is pivoted at its upper Y edge as at 28. The sides of the pipe are extended at each side of the valve as at 31 90 for preventing the entrance of air when the valve is opened fordischarging the material accumulated in the pipe 16.

The separator 20 1s provided with a ipe fitting 32 to which the pipe 16 is attac ed. 95 The fitting 32 is` so arranged that the air entering through the same 1s delivered tan gentally into the interior of the separator.

The'separator 20 is preferably of the t shown in`my copending application S.

73,581 filed December 7, 1925, and comprises an upper section 33 preferably though not necessarily circular in cross-section, and a lower conical Section 34. As shown, the upper section -is cylindrical. The cylindrical portion is provided with a closure 35 through which extends a pipe 36. The inner end of the pipe 36 extends axially of the separator 2O and terminates adjacent to the plane dividin the upper and lower sections, as indicate in dotted lines in Fig. 1. The pipe 36 is provided with a valve or blast gate 37 for controlling the flow of air through the pipe 36.

The stream of air carrying the ground material enters the separator tangentially and circulates or revolves about the pipe 36 whereby the ground material is, by centrifugal force, thrown outward against the interior of the separator, the air and finer material escaping from the center of the revolving mass through 4the pipe 36 into the fan 17. The coarser materlal gravitates to the bottom of the cone and `escapes through the opening 38.

The separator thus far described is similar, if not identical with the conventional dust collector except that it is not provided with a gravity valve at the discharge opening 38.

It has been found by experiment that if `air be admitted at the bottom of the conical section 34 the properly ground material may be carried over by the fan into the collector 21. Suitable means are provided for admitting air to the bottom of the separator. As shown, a casing 30 having the same general shape as the

members

33 and 34 is attached to the lower end of the conical member 34. This casing comprises a cylindrical portion 360 and a conical section 370. The parts are so arranged that the opening 38 is on the axis of the casing and is adjacent to the plane dividing the upper and lower sections of the casing 30.

One or more inlet fittings 39 are provided in the cylindrical portion 360. These fittings are so arranged that air will enter the casing 30 tangentially and will revolve about the lower end of the conical section 34 in the same manner and in the same direction as the air in the cylindrical section 33. The revolving air will pass upward through the opening 38'and will cooperate with the air in the separator proper to separate the properly ground from the coarser material. The properly ground material is removed through the pipe 36 and the coarser material is returned to the mill through a suitable valvc 40. The inlet fittings 39 are provided with valves or blast gates 41 for controlling the amount of air admitted. The more air admitted to the casing through the inlet fittings 39 the more material will be Carried over into the collector, so by regulating these valves the desired fineness of the ground material may be obtained. The coarser material gravitates to the bottom of the casing 30 and is discharged by gravity through the valve l into the mill 15 to be reground. If desired, a central conduit 42 may be provided for supplying air to the central lower portion of the conical section. The conduit 42 is provided with a valve or blast gate 43 for opening and closing said conduit.

From the separator the air and ground material -is drawn into the fan which forces the same through the conduit or pipe 19 into the collector 21. The fan is operated by any suitable means, as the motor 44.

In the form of the device selected to illustrate one embodiment of the invention, the collector 21 comprises a casing havin an upper section 45 which is preferably though .not necessarily cylindrical, and a lower'conical section 46.

The upper section 45 is provided with a partition 47 which is preferably in the form of a funnel, that is, it is conical with a depending cylindrical projection 48 which extends adjacent to the plane of the meeting portions of the two sections of the collector.

The upper section 45 has a closure 49 through Awhich extends a breather pipe 52. The pipe 52 extends axially into said cylindrical portion both above and below said closure 49 and is provided with a lower section or extension 53 telescopically mounted on the lower end of the same and held in adjusted position by any suitable means as the rods rigidly connected .to said extension and held in adjusted position by the nuts 54 threaded on said rods and engaging the upper suface of said closure.

If desired, a deflector 55 may be suspended beneath the lower end of the section 53. Preferably the deflect( is in the form of an inverted cone and i held in spaced relation to the section 53 by the straps 56. The apex of the cone is preferably removed whereby any material that may collect in the cone may escape through the opening formed therein.

The inlet fitting 57 for the pipe or conduit 19 is attached to the cylindrical section of the collector below the partition and delivers the air into said section tangentially thereof, whereby the air will revolve about the cylindrical portion of the partition, thereby separating the ground material by centrifugal force. The material will gravitate to the bottom of the cone section 46 and will be discharged through the gravity valve 58 into a suitable receptacle inthe usual manner. The gravity valve 58 is normally held in closed position by the weight 59 adjustably mounted on the arm 61 rigidly connected to the valve 58. The arrangement is substantially the same as the valve 25 at the lower end of the conduit 16.

The outlet fitting 62 for the pipe 22 is at tached above the partition and is so arranged that the air leaves the cylindrical portion tangentially thereof. The two littings are so arranged that the air above the partition is caused to revolve about the lower end of the breather pipe in the same direction as the air below the partition whereby the material escaping with the air into the upper section will be thrown outwardly. Since the breather pipe extends down into the axis or vortex of the revolving body of air, the air escaping through said pipe will be substantially free of dust. This is considered an important feature of the invention since it insures a minimum loss of material through the breather pipe and eliminates the objectionable pollution of the air in the vicinity of the buildin The material in the lower section of the co lector will gravitate to the bottom of the cone 46 and will be discharged through the gravity valve 58 into a suitable receptacle 63.

The upper end 52 of the breather pipe 5l may be provided with the usual Weather cap 64 and may, if desired, be provided with a valve 65 for controlling the size of the opening in said pipe. The valve 65 is adapted to be operated in any suitable manner by the arm 66.

The air escaping from the collector through the fitting 62 is conducted by the pipe 22 back to the air conduit 16. If desired a'valve 66 may be provided in the lower portion of the pipe 22. This valve may be held in closed position by a weight 71 adjustable along the arm 72 on the valve or by a light spring.

It is desirable that the parts be so constructed that the air in the pipe 22 will not be under compression at this point. If the a1r escapes through the valve 66 it will indicate that the air is under pressure at this point and the operator, being apprised of this condition may properly regulate one or more of the other valves of the system to correct the difficulty.

In the form of the device shown in Fig. 5, the air supplied to the casing 30 may be obtained from the pipe 22. The pipe 22 is provided with a fitting 67 to which the pipe 68 and the pipes 69 are connected. The pipe 68 is attached to the inlet or central conduit 42 and the two pipes 69- are attached to the inlet fittings 39.

It is thought from the foregoing taken in connection with the accompanying drawings that the construction and operation of my device will be apparent to those skilled in the art, and that various changes in size, shape, proportion and details ofgconstruction may be made without departing from the spirit and scope of the appended claims.

l claim as my invention:

1. In combination, a collector comprising an upper section, a lower cone-shaped section, an extensible breather pipe extending down into said upper section, an inlet and an outlet fitting'tangentially secured to said upper section, said fittings being arranged to cause the air to revolve about said breather pipe, a valve in said pipe, and means for varying the length of said pipe.

2. A dust collector comprising a casing having an upper section circular in cross-section, a lower conical section, a partition having a central opening in said upper section, an inlet fitting for directing air tangentially into said upper section below said partition, an outlet fitting for permitting the escape of dust from said lower section, a breather pipe extending down into said upper section along the axis thereof and having an adjustable lower section, and a valve in said breather pipe for controlling the size of the passage therethrough.

3. A dust collector comprising a casing having an upper section provided with a partition having a central depressed portion, said depressed portion being provided with a depending cylindrical member, a coneshaped lower section, a breather pipe extending axially into said casing and being provided with a telescopic extension, an inverted cone-shaped cap carried by said extension and extending into said depressed portion, and means for delivering air into said casing below said partition and means for conducting air from said casing from above said partition.

4. A dust collector, comprising a casing having an upper section and a lower conical section, a partition in said upper section, means associated with said casing for causing the air above and below said partition to revolve about the longitudinal axis of said casing in the same direction, and a breather pipe extending into the axis of the revolving mass of air, said breather pipe comprising upper and lower telescopic sections of substantially the same internal diameter, means for holding said sections in adjusted position, and a deflector member suspended from the lower section and movable therewith.

5. A dust collector comprising a casing having an upper cylindrical portion and a lower conical portion, means for conducting air into the upper portion of said casing and causingy the same to revolve about the axis thereof, means for conducting the air from the upper portion of said casing, an air discharge pipe having one end extending axially into said casing, said discharge pipe comprising an upper fixed section, a

lower movable section of substantially the same diameter telescoping said upper section, means for holding said lower section in adjusted position on said upper section, and a deilector member secured to said lower section and extending below the same.

6. .A dust collector, comprising a casing having an upper cylindrical section and a lower conical section, means for introducing air into said casing, means for conducting air from said casing, a breather pi e extending axially downwardly into said casing, said pipe comprising telescopic sections of substantially the same dlameter, and a valve in said pipe for controlling the escape of air therethrough.

7. A dust collector comprising a casing having an upper cylindrical section of uniform diameter throughout its length and a lower conical section attached thereto, a partition for said upper section, a breather pipe extending into said upper section, a conduit for delivering air and ground material tangentially to said casing below said partition for causing the air to rotate in one direction in said casing, and a conduit for permitting the escape of air tangentially from the casing above said partition in a direction to cause said air to continue to rotate in the same direction within said casing, said breather pipe comprising telescopic sections and means for holding said sections in adjusted positions.

8. A dust collector comprising a casing having a cylindrical upper portion of uniform diameter throughout its height and a cone-shaped lower portion, a funnel-shaped partition in said cylindrical portion, a breather pipe extending axially into the upper end of said casing and into the funnel formed by said partition, an air inlet below said partition, an air outlet above said partition, and an inverted cone-shaped defiector supported beneath said breather pipe.

9. A dust collector, comprising a casing having an upper cylindrical section and a lower conical section, a partition in said upper section, an`d means associated with said casing for causing the air above and below said partition to revolve in the same direction about the longitudinal axis of said casing, an extensible breather pipe extending downward into said casing, and a valve in said pipe.

10. A dust collector comprising an upper cylindrical section of uniform diameter throughout its height, a lower conical section, a partition in said upper section, said partition being provided with a depending apertured portion, a telescopic breather pipe extending down into said upper section, a tangentiall arranged air inlet below said partition or conducting air into said upper section and causing the same to revolve about the lower end of said breather pipe, and a tangential outlet fitting above said partition,

In testimony whereof I alix my signature.

WILLIAM B. PROUTY.