Bag Hanger

Abstract

A bag filter having a plurality of bags contained in a bag house. One end of the bags is secured to openings in the bag house floor and the other ends are suspended from an elongated hanger plate located in the upper part of the bag house. The plate is provided with slots at spaced intervals along its length, and each slot extends from the edge of the plate toward the center line thereof. Suspension rods attached to the top of the bags extend upwardly, pass through the slots in the hanger plate, and are selectively movable laterally into and out of the slots. Springs rest on the plate, urge the rods upwardly, and thus maintain tension on the bags. For initial installation or replacement of the bags, suspension rods can be inserted in or removed from the slots in the plate, with the springs in place, by firm lateral pressure on the rods.

Description

BACKGROUND OF THE INVENTION

Bag filter units for the removal of entrained solids from gases typically comprise a plurality of vertically suspended bags contained in a bag house, with open, bottom-ends of the bags being secured to collars which surround gas openings in the floor plate of the bag house, and with closed, upper-ends of the bags being hung from an elongated hanger which extends across the upper portion of the bag house. In one commonly employed type of construction, the hanger for the bags is a plate or strip having a series of holes drilled along the length thereof. Rods connected to the upper end of each bag extend through these holes in the plate and are suspended on a helical spring centered on the rod. The springs are under compression and thus urge the rods upward and pull the bags taught.

To mount the bags, the rods are placed in the holes, a spring is placed on each rod, followed by a washer and then by a nut which is threaded on the end of each rod. Each nut is then tightened against its washer until a proper tension is placed on the respective bag. This same procedure must be repeated each time the bags are replaced, and can in any case be a very cumbersome and time consuming operation, since it is necessary to place each rod in its respective hole in the hanger plate, follow with an individual spring, washer and nut, and then tension each and every bag. All of this must be done in the close upper confines of the bag house already crowded with bags, and the problem is better appreciated when it is realized that the bag house can contain scores or even hundreds of bags.

SUMMARY OF THE INVENTION

It is therefore an object of the present invention to provide a bag filter wherein the bags can be easily attached to and removed from a hanger plate.

Another object of this invention is to provide a bag filter having bags suspended from spring mounted rods, and whereby tensioning of the bags is obviated or simplified upon installing or replacing bags.

Still another object is to provide a bag filter of the type described wherein tensioning springs can be placed on the suspension rods for the bags prior to mounting said rods on a hanger plate, and whereupon dismounting the rods from the plate the springs do no have to be removed from the rods beforehand.

Other objects and advantages of the present invention will become apparent from the following description and the appended claims.

The present invention is an improvement in bag filters of the general type having a plurality of bags contained in a bag house and wherein one end of the bags is secured to openings in the bag house floor and the other end of the bags is suspended from the upper end of the bag house. In accordance with the present invention, a hanger plate having slots cut at spaced intervals along the length of the plate is securely fixed in the upper part of the bag house. The slots in the plate extend from the plate edge toward the center line of the plate. Rods are attached to the top of the bags and extend upwardly through the slots in the plate. Springs rest on the plate, urge the rods upwardly, and thus maintain tension on the bags and retain the rods in the slots. During operation of the bag filter the rods are free to move up and down in the slots, thus permitting the bags to flex, and although the rods are normally stationary with respect to lateral movement, they are nonetheless selectively movable laterally into and out of the slots for mounting and dismounting the bags from the hanger plate. To dismount the bags, the rods are merely pushed firmly to one side and out of the slots. The reverse procedure can be followed for mounting the bags. When initially installing or replacing bags the rods and their associated tensioning springs can first be attached to the bags outside of the bag house, and the approximate spring tension can be set prior to installation of the bags by adjustment of spring tightening means. By use of slots instead of ordinary holes in the hanger plate, rods and springs can be very quickly mounted and little or no adjustment of the bag tension is required after mounting.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a fragmentary side view in section of a bag filter having the bag hanging improvement of the present invention embodied therein.

FIG. 2 is a fragmentary side view taken through line 2--2 of FIG. 1.

FIG. 3 is a side view of the bag hanger and showing a bag hanging therefrom.

FIG. 4 is a front view of the bag hanger taken along line 4--4 of FIG. 3.

FIG. 5 is a top view of the bag hanger taken along line 5--5 of FIG. 4.

DETAILED DESCRIPTION OF THE INVENTION

In FIG. 1, filter bags 1 are suspended in a bag house generally depicted at 2 and having a top wall 3, side walls 4, a floor plate 5, a solids-discharge hopper 6, an inlet 7 for gases to be cleaned of entrained solids, an outlet 8 for removal of cleaned gases, and an outlet 9 for solid material removed from the gases by the bags.

The bags 1 are suspended from a channel iron having a web 10, an upper flange 11 and a lower flange 12. The lower flange 12 is provided with slots 13 along the length of the flange. Suspension rods 14 extend vertically through the slots from a bag cover and collars 15, and terminate above the lower web 12 of the angle iron at nuts 16 having recessed washers 17 and helical springs 18 underneath. The lower ends of the bags are clamped to collars 19 attached to the floor 5 and which surround the gas inlets 20 to the bags. The bags are kept taught by the upward push of springs 18 against the washer and nut on the suspension rods 14.

The hanger assembly is shown in enlarged detail in FIGS. 3, 4, and 5.

To hang the bags, the bottom of each is first clamped to the bottom collars 19 of the bag house. With the top cover and collar 15 fastened in place by means of clamp 15a, rod 14 is rotated outward in nut 21 until the rod can be pushed laterally into the corresponding slot 13 without first having to tightly compress the spring 18. Once the rod 14 and its corresponding spring are in place on flange 12, the rod is then turned, if necessary to tighten the bags, by means of a wrench and using flat 14a to obtain a grip. Accordingly, the bags are very easily hung in place and can be just as easily removed.

Advantageously, the lower flange 12 can be provided with recesses 22 to accommodate the springs 18 so that the bags do not fall loose from the channel iron.

In the embodiment of the invention shown in the drawings, the slotted hanger plate is the lower flange 12 of a channel iron, but it will be understood that other metal members of sufficient strength for the purpose can be employed as the hanger plate, e. g., a thick, flat plate, or the flange of an angle iron. It will also be appreciated that springs of a type other than helical can be used in the invention, e. g., eliptical springs having an opening at each end for mounting on the rods. Furthermore, it is preferred that the suspension rods be threadably movable along their axis for compressing the springs and thus tightening the bags, but this feature can be made optional, e. g., taughtness of the bags can be controlled by varying the extent to which they are slipped over the collars 19 and clamped in place thereon. Another optional feature not shown in the drawings is use of recessed washers which are placed underneath the springs 18 and fit into the recesses 22. Use of lower washers in this fashion makes the rods even more secure from side-to-side motion during operation but facilitates mounting and dismounting of the rods and springs from the hanger plate when installing or removing the bags.

A convenient manner of quickly hanging the bags, especially when a large number is involved, is made possible by the present invention. As previously indicated, with the bags outside of the bag house the rods 14 having springs 18 thereon can first be screwed into the bag covers and collars 15 to an extent that proper tension will be placed on the bags when they are hung and securely fastened to the bottom collars 19. Several rows of bags having the springs preadjusted can then be suspended from the hanger plate, followed by pulling the bags taught and fastening to the lower collars. This sequence can then be repeated for subsequent rows of bags, always working toward the bag house door in order to maintain free access into and out of the bag house until the last bags are in place.

The invention has been described with reference to particular material and apparatus, and also to particular arrangements and functions thereof, but it will be understood that even other embodiments will become apparent which are within the spirit and scope of the invention defined in the following claims.

Claims

Therefore, what is claimed is:

1. In a bag filter having a plurality of bags contained in a bag house, one end of the bags being secured to openings in the bag house floor and the other ends being suspended from the upper part of the bag house, the improvement which comprises:

a. an elongated bag hanger plate which extends across the upper part of the bag house, said plate having slots at spaced intervals along the length thereof, each slot extending from the edge toward the center line of the plate,

b. suspension rods attached to the top of said bags and which extend upwardly through said slots in the plate including rigid members, said rods being free to move up and down in said slots but being normally stationary with respect to lateral movement and yet selectively movable laterally into and out of said slots in said hanger plate,

c. helical springs which rest in recesses on the upper side of said plate and extend around the axes of the rods, urge said rods upwardly, and the top of the springs urge upwardly against the rigid members and thus maintain tension on said bags and retain said rods in said slots.

2. Apparatus as defined in claim 1 wherein the rods are threadably movable on their longitudinal axis, and said rigid members are washers mounted on said rods.

3. Apparatus as defined in claim 2 wherein said plate having slots is the flange of a channel iron.