DE2643777A1 - PROCESS AND DEVICE FOR MANUFACTURING TUBULAR FILTER BODIES - Google Patents

Description

Incom International, Inc., 415 Holiday Drive, Pittsburgh,

Pennsylvania 15222, USA

Method and apparatus for making tubular

Filter body

The invention relates to a manufacturing method tubular filter body made of filter material on a tubular drum with a hollow inside and cylindrical Outside, devices for carrying out this method and a filter made according to this method.

The invention is particularly important for filters that are provided on the blowout openings of air pumps finely distributed oil vapor or oil droplets from the air stream to be eliminated. This prevents environmental pollution and the separated oil can be used again if necessary be used.

There are already numerous embodiments of such filters as well as various methods for producing these filters known.

The invention has set itself the task of a novel manufacturing method and novel devices for Specify the manufacture of such newly constructed filters, with which it is possible to create filters that are particularly suitable for these purposes to manufacture high-quality filters in a simple and therefore cost-saving manner.

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This object is achieved in a method of the type mentioned in that first the cylindrical outer surface the drum is placed on a friction roller drive, then a strip of this filter material between the drum and the friction roller drive is introduced, then the filter material is wound onto the rotating drum, and that during of the winding process, the drum is pressed against the friction roller drive by force acting on its inside Purpose of a tight winding of the individual layers on the drum.

It is advisable to use a device to carry out the method which is characterized in that that on the outside of the cylindrical drum serving to wind up the filter material, two sets them in rotation Friction rollers are arranged that in the vicinity of these friction rollers on the inside of the drum ej.ne in the radial direction: movable pressure roller provided and the mutual distance between the friction rollers and the pressure roller is variable that Means are provided for feeding the filter material between the outside of the drum and the friction roller, and means are provided for changing the contact pressure of the pressure roller.

Further developments and refinements of the invention are described in the subclaims and are described below in Described in connection with the figures representing the exemplary embodiments. Some of these are schematically simplified drawn, and not all for understanding the invention necessary details have been omitted for the sake of clarity. Corresponding parts are designated in the same way in the figures.

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Ss shows:

Fig. 1 is a vertical section of a filter arrangement according to Invention,

2 shows a section through a filter element as a structural detail according to Fig. 1,

Fig. 3 is a schematic "representation of a device for Production of a filter element according to the invention.

As can be seen from FIG. 1, the filter device 10 has a filter housing 12 and a filter system 14 mounted therein. In the figure, an embodiment is shown as it is used, for example, on the blow-out opening of a vacuum pump will; however, other embodiments and other purposes of application can also be envisaged within the scope of the invention will. The filter housing 12 has a lower part 16 and an upper part 18. The lower part 16 has an inlet port 20, which the blown air (the air path is indicated by arrows) into the interior of the filter system 14 directs. The air flows outward through the filter system 14 and through the outflow channel 22 through the overlapping walls of the lower part 16 and the upper part 18 is limited. A drainage opening 24 in the lower part 16 enables the liquid separated from the air flow discharge, which collects at the bottom of the filter housing 12.

The filter system 14 consists of one that acts as an agglomerator tubular filter component 26 and a tubular component 28 which is arranged coaxially therewith and which acts as a collector; an intermediate space 30 is provided between the two. A screen 31 formed from sheet metal surrounds the tubular filter component 26 to protect it from damage caused by the air pressure of the vacuum pump.

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Each end 32 of the filter system 14 has a support and sealing element 34, which the tubular filter component 26, the screen 31 formed from sheet metal and the coaxially arranged therewith tubular component 28 holds in the intended spatial arrangement and ensures that the entire air flow through the filter system 14 is passed through.

Fig. 2 shows a typical, preferred embodiment of one Filter element 36. The typical embodiment of a filter element 36 according to the invention shown in FIG. 2 consists from a plurality of layers of the filter material. In this Fig. 2 only the tubular filter component 26 is without - that Sieve made of sheet metal, added later, shown. The filter element 36 consists of a first layer 38 formed from a 16 mesh screen which is made of a fiberglass screen covered with PVC and sealed at 40 by the action of heat, so that it keeps its tubular shape. The filter material 42 of the filter element 36 contains approximately five, for example Layers of 1/2 "Owens Corning FM 004 fiberglass weighing 12 grams per square foot. The outer surface of the Pilter element 36 is formed by a double layer 46 of a PVC-coated fiberglass screen of the type mentioned above covered.

Some details of the embodiment shown in Fig. 2 will be better understood if the manufacture of the Filter elements 36 in FIG. 2 is described. The filter material for the component 28 acting as a collector is expediently made made of four layers of 1/2 "Owens Coming FM 018 glass fiber weighing 22 grams per square foot.

A system 50 for producing the filter system or the filter components 26 and 28 is schematically greatly simplified in FIG. 3

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shown. The components shown here are for the experts known and can be arranged, controlled and regulated in various ways; they will not go into their particulars described.

The manufacture of the preferred embodiment of the filter components 26 and 28 are made by winding on a drum 52, which has a hollow inner side 54 and a cylindrical outer surface 56 has. The latter is expediently made with Teflon or wax covered to lighten the filter components after their manufacture to be able to remove from the drum 52. It can also be eii / preformed perforated tube can be used as a winding body, which then also serves as a protective body for the wound on it Component of the filter system is used.

In this case, the component produced is not τοη the as Drum serving perforated tube removed, because it serves as an essential part of the filter device.

The drum 52 serving as the winding body is placed on two friction rollers 58 serving as a drive. On the inside the drum 52 is provided with a pressure roller 60 which is releasably fastened on a pressure rod 62 of a pressure cylinder 64 is. The axis of the pressure roller 60 is parallel to the axes of the friction rollers 58, so that by the action of the pressure cylinder the outer surface 56 of the drum 52 is pressed onto the friction rollers 58 and is carried along by these by friction. By means of the pressure cylinder 64, the push rod 62 can be moved in the direction of the friction rollers 58 or in the opposite direction are, depending on the desired contact pressure and depending on the thickness of the filter material wound on the drum 52 j this is indicated by the arrow 4.

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An endless conveyor belt 66 is over the friction rollers 58 and the non-driven guide roller 68 out. This conveyor belt 66 is the first component of the device shown in FIG. 3, which contacts the drum 52 when it is installed in the plant 50. Although the conveyor belt 66 has a certain Forms support for the material to be wrapped around the drum, it is primarily intended to to support the fed strip of non-woven filter material 70, which is used for the formation of the filter system or its components 26 and 28 is important.

In the preferred apparatus shown in FIG. 3, the friction rollers 58 can be operated simultaneously with one another in any desired manner Rotate direction to thereby rotate the drum 52; in this case, pressure rollers 60 can be used in a corresponding manner contribute.

In the preferred embodiment of the filter element 36 shown in FIG. 2, the first is to be wound onto the drum 52 Filter material made of a PVC-coated fiberglass layer 38. From Fig. 3 it can be seen that the first layer of layer 38 is wrapped around outer surface 56. Furthermore, it is shown at the top left in Fig. 3 that the system 50 also includes an auxiliary device 72 which can be used for winding the first layer. A supply roll 74 is in a bearing 76 rotatably mounted. A heavy roller 78 is used to maintain a certain pre-tension on the supply roller 74, when a strip of layer 38 is peeled from supply roll 74 and fixed over a pair of Guide rollers 80 is guided. A tensioning roller 82 is arranged in the area of the two guide rollers 80 and protrudes into the path of the von The strip of layer 38 drawn towards the drum 52 of the supply roll 74. The tensioning roll 82 is rotatable on an arm 84 stored, which by the action of the pressure cylinder 86 either in the direction of the running strip of the layer 38 or

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AO

can be moved in the opposite direction, as indicated by arrow B.

The printing cylinder 86 can be controlled just like the above-mentioned printing cylinder 64 in such a way that a preselected tension is maintained in feeding the strip of first layer 38. It has been shown that one exerted on that strip during the feeding of the strip of layer 38 between drum 52 and friction rollers 58 additional tension causes the layer 38 to be wound onto the drum 52 more tightly than is the pressure rollers 60 could be effected alone. The application of this additional voltage is of great importance during the (in Fig. 3 not shown) final phase of. Filter manufacture with the nonwoven filter material 70 wound on the drum 52. These Tension also serves to ensure that the nonwoven filter material 70 is suitable for the desired filter manufacture is sufficiently compressed.

After the initial turns of layer 38 are wrapped around drum 52, a heat sealer 88 is attached to a brought longitudinally overlapped zone of the PVC-coated fiberglass layer 38 used. This heat sealer 88 causes the end of the strip of layer 38 to be firmly connected to this layer, as indicated at 40 is. Then the strip of the layer 38 which has not yet been wound onto the drum 52 can then be sealed along the Area 40 can be cut so that the nonwoven filter material 70 onto the layer 39 located on the drum 52 can be wound up.

The non-woven filter material 70 is peeled from a roll 90, from which it is guided to the conveyor belt 66.

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If the non-woven filter material 70 is ordered from polyester material (as mentioned above), then it is usually sufficient to feed this from the roll 90 directly to the conveyor belt 66. The nonwoven filter material 70 is placed between the drum and the friction rollers 58, the rotation of which causes it to be wound around the drum 52 with the desired number of turns is - as was already done with layer 38. If like it for a preferred embodiment of the filter element 36 is the case, the non-woven filter material consists of fiberglass, the system 50 also includes a humidifier 92 so that the fiberglass material for the Winding process is pretreated accordingly. However, as discussed above, the humidifier 92 would not are required if uncured fiberglass material is used, which is pliable due to good cooling Has retained state. However, if the uncured fiberglass material is not stored refrigerated, then it will be of an unsuitable consistency to be wound onto drum 52.

It has been shown that when the fiberglass layer 38 through a water tank 94 this soak in a. flexible State can be brought in which it is easy to process. It has also been shown that a hardened or Cured glass fiber layer is reactivated in a similar way, i.e. into one that is suitable for further processing State can be transferred. The humidifier 92 also includes a pair of nip rollers 96 through which the nonwoven Filter material 70 is passed to remove excess water. The distance between the nip rollers and the point at which the pressing force is applied to the Layer is exercised can be changed by shifting one of the two rollers 96 relative to the other roller accordingly as indicated by arrow C. Lets through trials

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the "best setting of the rollers" can easily be found. The distance the squeezing rollers 96 or the contact pressure can through remote control changed or automatically regulated by means known per se.

Four turns of the appropriately pretreated non-woven filter material are applied to the drum. Here, the pressure cylinder 64 is controlled in such a way that the desired compactness and density of the wound layers is achieved. In the path of the supplied strip of the layer 70 of non-woven filter material, a counter 98 is switched on, to determine the amount of material used.

Upon completion of the fourth layer, a strip of fiberglass layer 38 is placed between the filter layer 70 and inserted the last winding wound around the drum 52, so that a double layer 46 is formed. The beginning of the The introduction of the glass fiber layer 38 is denoted by 100 in FIG. 2. The strip of layer 70 and the strip of Glass fiber layers 38 are wound onto the drum 52 together during one revolution, and so - then the Strips of the nonwoven filter material 70 cut off. As the drive rollers 58 continue to rotate, the double layer becomes 46 wrapped only with the material of the glass fiber layer 38. The heat sealing device 88 is now used again to seal the outer layer of the fiberglass layer 38 set so that when the supplied strand of layer 38 is cut, the drum 52 is the completed filter element 36 is located. In order to precisely determine the position of the double layer 46 in relation to the filter layers, it has proven to be useful to reverse the direction of movement of the drive rollers 58, ao that the drum 52 rotates counterclockwise. To complete the filter, the filter element 36 produced is used

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in an oven to about 218 degrees Celsius (425 degrees Fahrenheit) heated. At this temperature the plastic becomes the glass fiber layer hardened and the overlapping PVC layers welded together so that the filter element 36 becomes a solid, rigid tube. The filter element 36 cut to fit, mounted with a second filter element produced in an analogous manner on the support and sealing elements 34 and thereby a finished filter system educated.

From the above it should be clear that the filter elements, which are used as agglomerators or collectors, can be produced with the same system, only the drum 52 must have different diameters. It is for example also possible, as mentioned above, to wind the filter layers 70 onto the drum 52 at the beginning, if this consists of a perforated metal sleeve or a metal mesh, which then forms part of the filter element 36 forms, or after the filter element 36 has hardened and the drum 52 has been removed to insert a metal screen which serves to form the filter body 14. if If fiberglass layers are used for the collector, then the humidifier 92 can be used, too when the action of the adjustable squeegee rollers 96 has made the fibers coarser and the material denser.

The component of the filter system that is first switched into the airway serves as a so-called agglomerator and contains fine particles Fiber material that retains most of the solid particles contained in the air stream and also causes the im Air flow contained levers and steam hits the fibers and grows together to form larger droplets. The airflow carries the droplets that have grown together, and in the space 30 between the two components 26 and 28 of the filter

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systems some open from within as a result of gravity sink the bottom. However, many of these coalesced droplets are transported to the outer component of the by the air flow Filter system, which acts as a collector, where the droplets now grow together to form larger droplets, as a result, they become too heavy for transport in the air stream and sink to the ground, where they can be removed. Consequently the air flow flowing through the collector is relatively clean.

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Claims (1)

Claims Method for manufacturing tubular filter bodies from filter material on a tubular drum with a hollow Inside and cylindrical outside, thereby characterized in that first the cylindrical outer surface (56) of the drum (52) on a friction roller drive (58) is set, then a strip of this filter material between the drum (52) and the friction roller drive (58) is introduced, then the filter material is wound onto the rotating drum (52), and that during the WiekelVorganges the drum (52) through its inside (54) acting force is pressed against the friction roller drive (58) for the purpose of a tight winding of the individual layers on the drum (52). 2. The method according to claim 1, characterized in that at least a part (38) of the filter material made of non-woven Material consists and at least a part (70) consists of hardened and unhardened glass fibers and this is first moistened and converted into a soft, malleable form and only then wound onto the drum (52) will. 3. The method according to claim 1 and 2, characterized in that after moistening, the excess water is removed and only then is this material wound onto the drum (52) will. 4. The method according to claim 1, characterized in that at least part of the filter material in the form of a Net or sieve is supplied and this is wound under pretension on the drum (52). 7098U / Q790 5. The method according to claim 1 and 4, characterized in that the material supplied in the form of a network with PVC coated fiberglass consists of a longitudinally extending overlapping zone of this fiberglass winding is heated to bond the outer fiberglass to the underlying fiberglass winding and then the fiberglass strip is cut along the heated zone. 6. Apparatus for performing the method according to claim 1, characterized in that on the outside of the for The cylindrical drum (52) used for the filter material is wound up and two friction rollers set in rotation (58) are arranged that in the vicinity of these friction rollers on the inside of the drum one in the radial direction movable pressure roller (60) is provided and the mutual spacing of the friction rollers (58) and the pressure roller (60) is variable is that means (66) for feeding the filter material (38, 70) between the outside of the drum and the friction roller are provided and means for changing the contact pressure of the pressure roller (60) are provided. 7. Apparatus according to claim 6, characterized in that it has a supply roll (90) for non-woven filter material (70) and a conveyor belt (66) is provided with the friction rollers (58), which is used to feed this filter material between the friction rollers (58) and drum (52). 8. Apparatus according to claim 6 and 7, characterized in that a supply roll (90) for a strip of hardened and uncured fiberglass is provided and one Humidification system (92) is provided between supply roll (90) and conveyor belt (66), during which the Glass fibers are converted into a soft, malleable form. 7098U / 0790 9. Apparatus according to claim 6 and 8, characterized in that that the moistening system (92) means for guiding the strip through a liquid container and means for Remove the excess water, preferably containing two rollers (96), between which the strip passes is guided to the conveyor belt (66). 10. Apparatus according to claim 6, characterized in that in addition, a supply roll (74) with a screen or a net-forming material is provided and means (82, 84, 86) are provided to generate a bias when winding this material on the drum. 11. A filter produced by a method according to claim 1 to 5, characterized in that it consists of two coaxially arranged, tubular, flow through from the inside to the outside, components acting as filter bodies ^ 26, 28), between which an intermediate space (30) is provided, and that, seen in the direction of flow, the first, as Agglomerator acting filter body finer fiber material (26) and the second filter body acting as a collector Contains coarser fiber material (28), the air flow after passing through the second filter element first in a Chamber is deflected upwards and then 180 downwards and the bottom of this chamber has an outflow opening (24) for the separated liquid. 7098.U / 0-790