US1153751A

US1153751A - Apparatus for cleaning filters.

Info

Publication number: US1153751A
Application number: US66331311A
Authority: US
Inventors: Wilhelm Friedrich Ludwig Beth
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-12-01
Filing date: 1911-12-01
Publication date: 1915-09-14
Anticipated expiration: 1932-09-14

Description

vv. F. L. BETH.

APPARATUS FOR CLEANING FILTERS.

APPLICATION FILED DEC I, 1911.

PatentedSept. 14, 1915.

III I I l G II IIIIEI I IIII WILHELM FRIEDRICH LUDWIG BETH, LBECK, G-Erl w ,a

yAEIAIRA'ILU'S FOR CLEANING FILTERS.

Specification o f Letters Patent.

Patenten sept. it, reis..

Application led December 1,1911. Serial No. 663,313.

To aZZ 'whoin t may concern `Be it known that I, WILHELM FRIEDRICH LUDWIG BETH, manufacturer, subject of the German Emperor, residing at Lbeck, Germany, have lnvented certain new and useful Improvements in" Apparatus for Cleaning Filters, of which the following is a specification.

My invention relatesl to improvements in apparatus for cleaning filters by shaking the same, and the object of the improvements is to provide an apparatus in which the movable parts of the operating'fmechanism are not subjected to the shocks caused by the shaking operation, which shocks cause a rapid wear ofthe said movable parts.

With this object in view my invention consists in providing an apparatus for shaking the filters in which the shaking member is actuated from the operating gearing, through the intermediary of a force which is devoid of positive transmission connections with that member. This shaking member is preferably constituted by the reciprocating piston of a motor which is adapted to be operated by a suitable fluid under pressure or under a vacuum, and which is controlled by a rotating driving gear and transmits its reciprocating movement directly to the filters.

Filters for dust-laden air have been proposed, (see for example, applicants prior German Patents, Nos.- 52,812, 105,489, 164,001 and 169,361), in which the cleaning of the filters is effected through the agency of vibrating tapping fingers and similar devices that periodically strike the levers bearing the filters, whereby the latter are vehemently shaken. These cleaning devices, especially when applied to large or heavy filters, are open to serious defects, in that the aforesaid tapping fingers and levers are subjected to considerable wear and tear, and the former set up in the belts, gearing, or other driving mechanism recoils of comparatively reat ,intensity which are manifestly injurious thereto and which are transmitted in the form of intense shocks to the adjacent parts of the building; also, such devices, when in action, are extremely noisy. The objectionable features aforementioned are completely avoided by the improved construction hereinabove briefiy described, the piston member of the Huid-actuated motor comprehended in this construction having -no intermediate gear or other mechanical connections with the driving mechanism.

lin order that my invention may more clearly be understood, a structural embodi- -ment thereof is illustrated in the accompanying drawing which shows a vertical section of the filtering apparatus and the apparatus for shaking the lters.

Referring to the drawing, a suitable number of filters e of any known or preferred construction are suspended from a rod y within a filtering chamber m. At their lower ends the filters are secured to the bottom m1 of the filtering chamber, and through apertures m2 the filters open into a funnel ZJ through which the dust deposited on the inner surfaces of the filters can be removed. The said funnel is provided with an inlet stud g, through which the dust-laden air is admitted to the filters. At its top the filter chamber m communicates with valve-controlled suction means, preferably consisting of a valve chamber s1 which at one side is connected by a pipe g to an exhaust fan, (not shown), said chamber containing a hinged Hap valve s. At its opposite side the valve chamber has an opening through which pure air, preferably underpressure, can be admitted to the filter chamber when shaking the filters. The aforementioned flap valve c is adapted to be rocked into one of two positions indicated in full and dotted lines, whereby the filtering chamber is connected either to the passage g and to the eX- haust fan, or to the inlet o for pure air under pressure. As shown the rod 1/ is connected to a reciprocating member such for example as the reciprocatory pistoni of a motor whose casin or cylinder Z is secured on the top of the ltering chamber.- ln the present construction a solid connection is shown between the reciprocating piston and the filters z, but I wish it to be understood, that my invention is notlimited to such construction. A suitable motive fiuid, such as compressed air, is admitted to the cylinder Z through a conduit n, and the piston is reversed after each stroke by any known or preferred means. In the example shown a drag cylinder 7c is used for this purpose which slides within the cylinder Z and is taken along by the piston 7c during its stroke in` either direction. The cylinders Z and Za are provided with inlet and outlet ports Z1, cl and Z2, 7:2, and corresponding inlet and was outlet ports are adapted to be brought -in register by the reciprocation of the cylinder la. Thereby the motive fluid supply and the exhaust port Z2 are alternately connected to or disconnected from the cylinder Z and the piston z', so that reciprocating movement is imparted to the latter.

The supply of motive fluid to the motor is automatically controlled, and the' said controlling means is operatively connected With the hinged valve s in such a Way that the eX- haust fan is shut off from the filtering chamber and thereby the supply of impure air thereto is stopped When shaking takes place.

In the example shown, the controlling means consists of a spring actuated piston valve it Which is operatively connected with the hinged valve s by means of a rocking lever f and a connecting rod f1. In the position of the parts shown in full lines, the motive fluid supply to the motor is opened, and the valve s connects the filter chamber to the atmosphere or to a supply of pure air under pressure and closes it against the exhaust fan. Therefore the exhaust fan is cut out of operation and the filters are being shaken by means of the piston z'. If the valve h and the hinged valve s are shifted tothe right andA into theposition shown in dotted lines, the admission of the motive fiuid to the motor is closed, thus cutting the latter out of operation and the exhaust fan is connected to the filter chamber. Therefore, the shaking of the filters is stopped, and impure air flows again to the filter chamber.

In the preferred form, the operation of the valve s and the valve zy is automatically controlled at suitable periods. As shown, the operating means consist of a slowly rotating cam a; Which once for each rotation lifts a rod f2, connected to the lever f, into b position for engagement by a rather rapidly rotating cam d. The said cams are mounted on a suitable bracket t. The cam d is rotated by means of a pulley Z1 and a belt trained thereon, and the cam a is rotated by means of asv-crm gear a2, a1. -At its rear the rod f2 is forked and each of its branches .f is formed with a nose 1" and e'respectively.

XVhen the rodi;c2 is lifted by the cam a the lower nose cis in position for engagement by the cam d, so that the rod f1, the valve h and the flap s are shifted into the position shown in full lines in Which shaking takes place. As the cam a gradually proceeds the rod f2 drops downward, with its nose e out of engagement with the cam Z and with its nose 1 into position for engagement there- With, so that the valve h and the fiap s are shifted to the right and the cylinder l is shut ofiI from the pressure fluid supply.

Though in Adescribing the linvention reference has been made to a construction, in which the rocking valve s is directly operated by the gear of the valve lz., I Wish it to be understood, that my invention is not limited to the construction shown, and that other means may be provided to move the valve s, such for example as a special motor, an electromagnet, or the like.

I claim herein as my invention:

1. In filter cleaning apparatus of the character described, thercombination with a' filter supporting member, of a reciprocable motor having a free piston that is directly connected to the filter supporting member and operative to alternately distend and relieve such distension of the filters, and automatic controlling means for causing reciprocation of said motor at predetermined intervals.

2. In filter cleaning apparatus of the character described, the combination with a filter supporting member, and means for alternately submitting the filter chamber to the action of compressed air and a vacuum, of a Huid-actuated motor having a free piston that is connected to the filter' supporting member and operative to raise and lower the same to alternately tension and relieve such tension on the filters, and a controller operative to automatically time the operations of said motor and said compressed air and vacuum controlling means. y

3. In filter cleaning apparatus of the character described, the combination with a filter supporting member, and valve means for alternately submitting the filter chamber to the action of compressed air and vacuum, of a fluid-actuated motor having a free pis- 100 ton that is connected t0 said filter supporting member, and automatic controlling means common to said motor and valve, means for causing the motor at timed intervals to distend the filters While the filter 105 chamber is subjected to the action of compressed air and to cause the motor to relieve such distention of the filters While the filter chamber is subjected to vacuum action.

4. In filter cleaning apparatus of the 110 character described, the combination with a yfilter supporting member, and means for alternately subjecting the filter chamber to compressed air pressure and vacuum, of a reciprocable motor having a free piston that is directly connected to said filter supporting member, and an automatic controller operative to cause reciprocation of the motor in one direction While the filter chamber is subjected to the action of compressed air 120,

ing member arranged to engage said projections alternately to shift said rod endwise in opposite directions.

6,. ln an apparatus of the character specified, the'combination of a fluid-actuated element, means for supplying motive fluid thereto, and a controller for regulating the fluid supply comprising a valve, a rod connected with the valve and having a forked end the branches of Which are formed With a pair of opposed projections, and a rotary driving member disposed between said branches and arranged to engage said projections alternately to shift said rod endwise in opposite directions.

7. ln an apparatus of the character speci'- ed, the combination of a fluid-actuated element, means for supplying motive fluid thereto, and a controller for regulating the uid supply comprising a valve, a rod connected With the valve and having a pair of opposed projections, a rotary driving member, and means for periodically rocking said rod to bring said projections alternately into position for engagement by said driving member.

8. ln an apparatus of the character specified, the combination of a Huid-actuated element, means for supplying motive uid thereto, and a controller for regulating the fluid supply comprising a valve, a rod connected with the valve and having a pair of opposed projections, a rotary driving member, and a slowly-rotating cam operative upon said rod to rock the same periodically and bring Vsaid projections alternately into position for engagement by said driving member.

ln testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses.

WILHELM FRIEDRICH LDWIG BETH.

Witnesses g Joint WULF, HERMANN RHODE.