US2533644A - Filter cleaning apparatus - Google Patents

Description

Dec. 12, 1950 G. H. VOKES 2,533,644

FILTER CLEANING APPARATUS Filed Oct. 11, 1949 Patented Dec. 12, 1950 FILTER CLEANING APPARATUS Gordon Heatherton Vokes, Guildford, England, assignor to Vokes Limited, Guildford, England Application October 11, 1949, Serial No. 120,769 In Great Britain October 18, 1948 1 Claim.

There are well-known filtering installations in which bays or sections of filtering units are agitated and in some cases a reverse fiow simultaneously passed through the filterin material to remove accumulated material from the dirty side. For example, there is described in co-pending specification No. 57,270 such an arrangement in which air already cleaned by other sections is periodically passed in the reverse direction through a section undergoing cleaning and agi- 1 tators are simultaneously oscillated inside suitably mounted bags or pockets of filtering material.

The present invention is designed to provide more efficient agitation than will normally be obtained by a system of rigid or spring mounted rappers oscillated by means of a simple crank arrangement, by substituting a system in which rappers are spring actuated (e. g. upon movement over centre by an oscillating member). The rappers may be checked, so that the resilience of parts carrying what may be regarded as the heads of the rappers and the momentum of the latter produce a sharp blow and an instant recoil.

In the specification referred to slotted or equivalent bars are used to transmit the motion from an oscillating shaft to the several tiers of units in a bay or section undergoing cleaning.

As illustrated in a typical form by the accompanying drawings, oscillating (used for convenience hereinafter to include reciprocating) actuating members cause toggle members to pass their dead centre positions alternately from opposite sides, so that the rapping is effected by the sharp movement due to a toggle spring becoming operative on alternate sides of the dead centre position.

In the drawings- Fig. 1 is an elevation,

Fig. 2 is a fragmentary plan, and

Fig. 3 a plan of mechanism for producing oscillation of the actuatin members.

As illustrated, a vertical shaft A is caused to oscillate by a cam B mounted on a rotating shaft 0 suitably driven. The cam B engages a roller D pivotally mounted on a lever E firmly fixed to the vertical shaft A. The roller D is suitably maintained in contact with the cam B, as indicated by the spring loaded plunger F carrying a pin Fl working in a slotted hole in lever E, all as shown in Fig. 3. Obviously any other conventional means may be used to obtain the desired oscillatory or reciprocating movement.

To the oscillating shaft A there is firmly fixed a lever arm G carrying one end of a tension spring H, the other end of which is attached to the toggle lever J carried from a fixed pivot at Jl. As the lever arm G oscillates, the toggle lever J will be caused to move sharply alternately to one side and the other.

This movement is transmitted to the heaters by a cross-bar K provided with a pin Kl working in a slotted hole in the toggle lever J. The bar K is pivotally connected to cranks L carried by the beater rods M in the foraminated filter bag frame 0. Beater arms N are carried by the beater rods and are thus moved sharply in alternate directions by the action of the toggle spring J and strike the bag frames.

In order to accentuate the suddenness of the blow, the beater arm N is made of spring steel or other resilient medium, and is caused to arrest its motion by means of stops P secured firmly to the sdies of the foraminated bag frames, allowing the momentum of the head and its resilient mounting to produce the desired sharp blow and instant recoil.

The movements of rappers in alternate units (or small groups of units) may be balanced to avoid excessive vibration of the whole by causing simultaneous beater movement clockwise in one bag and anti-clockwise in the adjacent bags, for example by engaging alternate cranks respectively above and below the pivotal axis.

I claim:

In a filtering installation having a plurality of filter bags in side by side relationship and oscillatable rapping means within each of said bags, a single mechanism adapted to actuate the oscillatable rapping means within each bag and comprising a plurality of cranks one at the end of each bag operatively connected with the rapping means within the said bag, a single bar pivotally connected with each of said cranks, a toggle lever carriedfrom a fixed pivot and connected by a slotted connection with the said bar, a rotary shaft, an oscillating shaft driven from the said rotary shaft, an arm mounted on the said oscillating shaft, and a tension spring connecting the said arm to a point on the said toggle lever, whereby the spring action from the said spring is distributed over the said rapping means without other operative contact between them.

GORDON IEATHERTON VOKES.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 870,830 Lechtenberg Nov. 12, 1907 1,303,008 Anderson May 6, 1919 1,356,086 Plaisted Oct. 19, 1920 2,196,839 Seng Apr. 9, 1940

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