GB2449846A - A coalescing filter - Google Patents
A coalescing filter Download PDFInfo
- Publication number
- GB2449846A GB2449846A GB0710151A GB0710151A GB2449846A GB 2449846 A GB2449846 A GB 2449846A GB 0710151 A GB0710151 A GB 0710151A GB 0710151 A GB0710151 A GB 0710151A GB 2449846 A GB2449846 A GB 2449846A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- oil
- coalescing
- drainage
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 claims abstract description 29
- 230000005484 gravity Effects 0.000 claims abstract description 5
- 229910010272 inorganic material Inorganic materials 0.000 claims abstract description 3
- 239000011147 inorganic material Substances 0.000 claims abstract description 3
- 239000000835 fiber Substances 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 3
- 241001133287 Artocarpus hirsutus Species 0.000 claims 1
- 238000003466 welding Methods 0.000 abstract description 11
- 239000011521 glass Substances 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 33
- 229920000728 polyester Polymers 0.000 description 10
- 239000011148 porous material Substances 0.000 description 8
- 150000002500 ions Chemical class 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 229920001410 Microfiber Polymers 0.000 description 4
- 239000003658 microfiber Substances 0.000 description 4
- 229920001778 nylon Polymers 0.000 description 4
- 238000004826 seaming Methods 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 239000000443 aerosol Substances 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000009958 sewing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000012815 thermoplastic material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 101150039167 Bex3 gene Proteins 0.000 description 1
- WFKSADNZWSKCRZ-UHFFFAOYSA-N Diethatyl-ethyl Chemical compound CCOC(=O)CN(C(=O)CCl)C1=C(CC)C=CC=C1CC WFKSADNZWSKCRZ-UHFFFAOYSA-N 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 229920005822 acrylic binder Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004887 air purification Methods 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000009999 singeing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2411—Filter cartridges
- B01D46/2414—End caps including additional functions or special forms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
- B01D46/003—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid
- B01D46/0031—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid with collecting, draining means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2265/00—Casings, housings or mounting for filters specially adapted for separating dispersed particles from gases or vapours
- B01D2265/04—Permanent measures for connecting different parts of the filter, e.g. welding, glueing or moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
- B29C66/114—Single butt joints
- B29C66/1142—Single butt to butt joints
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Filtering Materials (AREA)
Abstract
A tubular filter 10 for coalescing droplets of oil in a stream of gas, comprises an oil coalescing layer of a microfibrous material and a second layer of an oil drainage material located downstream of the first layer. The drainage layer is a butt-welded 30 tubular structure and is for receiving oil from the coalescing layer and for providing a path for oil to flow by gravity from the filter. Preferably the drainage layer is a non-woven felt or wadding thermally bonded by fusible bi-component fibres and the butt-weld defines a seal of given width formed using an ultrasonic welding machine. Preferably the coalescing layer is of glass micofibres or other inorganic material. The filter 10 may be used as an oil-coalescing filter in a rotary vane compressor or vacuum pump.
Description
IMPROVEMENTS IN COALESCING FILTERS
FIELD OF FIlE INVENTION
The present invention relates to an improbed coalescing filter and to its use 11w the remobal or oil droplets from an airstream, for example but not limited to an airstream from an oil-lubncated compressor or bacuum pump or in an air line. It also relates to a drainage layer for a filter as aforesaid.
BACKGROUND TO THE INVENTION
In air purification systems, pnmary separation filters (coalescing filters) are commonly provided downstream of an oil lubncated compressor (see US-A-423 1768, Pall Corporation). Coalescing filters are also commonly fitted to vacuum pumps for purifying the air stream from the exhaust side of the pump. In either case, the filter is likely to be challenged by a stream of air containing oil in the form of an aerosol of particle size 0.0 1-50 pm, though the filter may also be arranged for fluid flow in an out-to-in direction. The air stream is usually passed in an in-to out direction through a tubular filter having two working components, a layer within which the oil droplets coalesce and a drainage layer which collects the oil leaving the coalescing layer and retains it until it drips by gravity from the filter. The coalescing layer may be of borosilicate glass microfibers (see GR-A-1603519, the disclosure of which is incorporated herein by reference). The drainage layer may be provided by a porous sleeve of plastics foam or by a non-woven fabnc. Coalescing filters may be used with their axes vertical or horizontal.
Coalescing filters commonly spend their service lives wetted out with oil, and the problem of production of secondary aerosols from such filters is disclosed, for example, in GB-A-2 177019 (Pall Corporation). One avenue of researeh has been to try to reduce oil-carry-over from a coalescing filter by improving the drainage layer.
A known drainage layer matenal with low carry-over is an open-celled polyurethane foam having about 60 pores/inch and a PVC coating to provide resistance to chemical attack. The layer may also be colored with a dye or pigment to indicate the grade of filter. The material has Ihe advantage that its pore structure can he made very uni lhrm which assists drainage and reduces the tendency for oil blisters to form in the exterior of the drainage layer which can he expanded and burst by the stream of compressed air. However, in other respects the propeilies of the material are poor. Its S niaximum working temperature is 60 C whereas for many appi lent ions an ability to withstand I 20 C is necessai-y. It has poor resistance to contaminants in the oil and is attacked by some of the newer diesler synthetic oils. It is easily damaged throLigh handling and becomes brittle on exposure to IJV light.
Our W() 89/07484, the contents of which are incorporated herein by reference, discloses another solution of the oil carry-over problem based on the impregnation of the drainage layer with a fluorocarbon or other low surface energy material. As a result, the region of the drainage layer that is wetted out with oil becomes smaller. Treatment of both fbaiiis and flts is disclosed. A practical embodiment of that invention employs a drainage layer of an non-woen fabric which is a 50:50 blend of nylon (3.3 d.tex) and polyester (5.3 d.tex) with an acrylic hinder and fluorochemical finish. The weight of the drainage layer is 252 g/m2 arid thickness 3.2-3.Smm. However, we have found that this material has limitations arising from the way in which it is made. During the manufacturing process, the fibers are formed into a web which is subsequently heavily needled, afler which it is dipped into an acrylic binder and finally passed through a fluorochenucal dip in order to reduce the surfhce energy of the resulting structure. The heavy needling leaves visible holes in the fihnc. In use ofthe filter, oil emerges through the holes and forms droplets at the surlhce of the!hhric which become exploded by the Ibllowing stream of air, causing oil re-entrainment and poor separation performance.
A coalescing filter whose drainage layer is simple to make, in use gives air with low oil carryover, can he operated a temperatures above 60 C, and is resistant to light and to chemical attack is disclosed in our EP-B-0 177756, the contents of which are also incorporated herein by reference. That specification dsclose a filter fbi coalescing droplets of oil in a stream of gas, comprising an oil coalescing layer of a microfibrous material and a second layer of an oil drainage material located downstream of the first layer, said drainage layer being for receiving oil from the coalescing layer and providing a path lbr oil to flow by gravity from the filter, characterited in that the drainage layer is a non-woven flt or wadding thermally bonded by Ibsible hi-component fibers.
SUMMARY OF THE INVENTION
A problem with which the inention is concerned is to produce a further filter having a lurther advantageous conihinaiion of properties, in particular a drainage layer which is easy to nianuIictttre and has low oil carry-over.
[hat problem is solved, according to the invention, by!ro iding a tubular tiller kr coalescing droplets of oil in a stream ol gas, conlpnsing an oil coalescing layer of a iiiicrofihrous material and a second layer of an oil drainage material located downstream of the first layer, said drainage layer being for receiving oil from the coalescing layer and providing a path for oil to flow by gravity from the filter, characterized in that the drainage layer is a butt-welded tubular structure.
The invention also includes an oil-lubricated compressor or vacuum pump provided with an oil-coalescing filter as aforesaid. The invent ion further provides a process f'or puril'ing air from an oil lubricated compressor or vacuum pump which comprises passing the air through a coalescing filter as afoi-esaid. It yet further provides a drainage layer for the above filler, comprising lihric at least partially of heal-flisible material butt-welded to form a lube.
BRIEF DESCRIPTION OF THE DRAWINCS
1-low the invention may he put into efThct will now he further described, by way of example only, with refrence to the accompanying drawings in which: Fig. I is a view in isometric projection and obliquely fi'oni above of a filter according to the invention: Fig. 2 is a view of the liller of Fig. I in vertical section: and Fig. 3 is a flowchart showing the steps of' manufacturing a filter using a huLl-welded drainage sleeve ol thernioplastics material.
DESCRIPTION OF PREFERRED EMBODIMENTS
The filter 10 of the invention is of generally conventional structure and comprises first and second end Caps 12, 16 with an inlet 14 in the first cud cap. First and second Ioranii nous tubular members I 7, 1 8 e.g. of steel have between a coalescing layer of pleated horosilicate glass micro fiber (see (113-A-I 557821, the disclosure of which is incorporated herein by reference) and on the outer surface C) I the outer foraminous member I 8 a drainage layer 22. The filters pretrahly have end caps I 2, I 6 which have low aIiinily for contaniinants, and glass-li lied nylon which has an undesirably high affinity for water is advantageously not used, PJfl' or other polyester or metal being preferable end cap material. The foraminous tubular members, coalescing layer and drainage layer are attached to the end caps by adhesive 24, 26 and the upper end cap is formed with a groove for receiving an 0-ring 28 for sealing to a filter housing when the cartridge is screwed into position. l'he drainage layer comprises heat-fusible fibers butt- 1 5 welded as at 30.
Coalescing layer In general, the coalescing layer 20 may he of glass microfihers or other inorganic material, e.g. horosilicate glass niicroiibers and may he moulded, wrapped or pleated. It may also he of organic micro fibers e.g. polyester fibers. In the disclosed embodiment the coalescing layer is of pleated glass microliher, but in alternative embodiment it may be a molding in horosilicate glass microlihers as described in our GB-A-1603519, the disclosure of which is incorporated herein by reIrence.
Drainage layer Ihe drainage layer may have a weight of I OO-300g/m2, typically about 200g/m2, and a thickness o fahout 2-7mm, typically about 5mm. The fibers ofthe drainage layer advantageously have minimal intra-tiher and inter-fiber affinity for oil or other contaminants, and can he formed into a dimensionally stable flt or wadding of reproducible pore Si/C with little or no needling. For reduced affinity for contaminants, nylon fibers (which absorb water) are not used and the drainage layer comprises inert e.g. polyester fibers only.
l:or satisfactory dimensional stability it has been found in an embodiment of the inbent ion that typically about I 0-15 wt% of the fibers of the drainage layer should be fibers which are wholly or partly fusible, e.g. bi-component thermally bondable fibers.
If the proportion of bi-component or other fusible fibers is less than 5%, there is little bonding, whereas if then. are more than 25% the bonded fabnc becomes very still. We have found that with minimal needling and thermal bonding the resulting fabric has a generally uniform pore site which reduces or prevents preferential local oil through-flow.
the drainage layer material may on its intended outer face be subjected to a conventional treatment intended to reduce outwardly projecting fibers which provide retum paths for oil to the air stream. Such treatments include application of resin and surface heating or singeing, but obstruction of the exit pores of the drainage layer should be avoided. The material may also incorporate a dye or pigment for identification purposes. Embodiments of the drainage layer are resistant to the stress of pulses of air and are resistant to contact e.g. from the user's fingers, whereas a foam drainage layer exhibits poor resistance to such contact.
The majority fibers of the drainage layer may comprise polyester fibers of more than about 6 d.tex, and suitable fibers currently available are of sites 7, 17 and 24 d.tex, of which the 17 d.tex site has been found in some embodiments to give the best results, the 7 d.tex fiber size giving a smaller pore structure in which oil may be retained by capillary action. Polyester fibers have been been found to combine the properties of quick absorption of oil droplets into the material, ability to absorb a large mass of oil, quick oil drainage, and low final retention mass leading to a low final wet-band height when the resulting filter is in u.se.
The bicomponent fibers which are preferred for use in the drainage layer have a relatively high-melting core and a lower-melting sheath e.g. a core which melts at above about 2OWC and a sheath which melts at about 1 10-175 C. They may comprise about 10 wt % of the fibers of the drainage layer. The felt or wadding may be obtained by forming a loose web of the fibers, and passing the loose web between heated rollers so as to form a structure of an intended thickness and pore size, and it need not contain fluorocarbon. The minority hi-component fibers may he of the same chemical Composition as the majority fibers of the drainage layer, or they may he of di lThrent Coniposfi ion. They may he of the same diameter as the majority fibers, or they may he larger or smaller, the elThcl of the relatively low proportion of thermally bondable fibers S on the ovei-al I pore structure of' the drainage layer being signi licant ly less than that of the majority fibers. ror example the hi-component thermally bondable fibers may he polyester fibers of the same diameter as the reiiai iii ng libei s. A suitable drainage layer may he made from a 200 g/m2 thermally bonded I 7 d.tex polyester needlell I (available from Lantor (UK) Limited) crushed to a thickness of 5mm and formed into a sleeve which fits over the coalescing layer. The following other heal-fusible fibers which are smaller than the majority fibers may he suitable: (a) PES/PROP 2.2d.tex x 40 mm fibers Rising at temperatures of 1 30-140 C and sold under the trade name Damaklon 1SC. Risible hi-component by Damakion Europe lid.
(b) PES 5.5 d.tex x 60 mm hi-component fibers Rising at 165-I 75 C available from EMS Criltex.
(c) PES 4.4 d.tex x 50mm bi-coniponeni T9 1 Terital fibers fusing at 110- 120 C and available from fBM.
Thus a Rthric for a drainage layer may he made from 85 Wi % of 17 d.tex polyester fibers and I 5 wt% of' any o f the fibers (a) to (c) above, the fiber mixture being carded, crossfblded, needled, sprayed by means of a spray line successively with nitrile rubber (Synthomer 5046), resin (BT 336, BIP Resins) and colourant (C.I. pigment Red 1 0 I), and passed through an oven to cure the resin. The Ribric may he formed into a tube for pulling over the interior portions of a filter using an ultrasonic welding machine e.g. a Plhf'f Seamsonic 83 10 (Trade Mark) machine.
Butt welding Ultrasonic seani welding of' thermoplastic materials has been known at least sunce the publication in 1966 of' US-A-3242029 (Deans). That specification discloses ultrasonic sealing means in the form of' a transducer element having a rotating tool operatively coupled thereto, the rotating tool heiung adapted to cooperate with an anvil which may he stationary or may rotate in synchronism with the rotating lool. The apparatus is disclosed as being suitable for use with films of plastics and also of synthetic lihrics e.g of nylon.
Application of ultrasonic seam welding in relation to wo en textile materials S made wholly or partly of thermoplastic fibers in the manner of' a sewing machine is further discussed in EJS-A-3666599 (Oheda). In an amhodiment there is provided an ultrasonic seaming apparatus comprising a seaming station including an anvil, an electro-acoustic transducer having a resonator disposed opposite the anvil and defining with the anvil a nip through which a workpiece to be seamed is led, means lbr leediiig 1 0 the workpiece through the seaming station at adjustable reed rates, and means couopl ing the leding means to a source ol' electrical energy for controlling the velocity of' the resonator in response to the Iced rate of' the workppiece.
IJS-A-3852 144 (Parry) discloses a seaming machine which ultrasonically fuses or bonds two or more layers of' thermoplastic material together in a manner similar to a sewing machine and includes means fOr cutting and f'using the material in a marginal portion adjacent the seam. In the apparatus, ultrasonic means are provided to efict a longitudinal seam and additional means are provided to simultaneously cut and fuse the material adjacent the seamed area. In this manner it is possible to fuhricatc completely finished articles wherein the fOlded seani or hem usually deemed necessary to provide 2() an acceptable finished appearance can be omitted.
The state of' the art with relrence to ultrasonic machines fOr Joining fabrics is further illustrated in US-A-65 1765 1 (Azulay) and 6099670 (Louks ci a!.).
Fo the best of' the applicant's knowledge, ultrasonic butt welding has not hitherto been applied to the nianul'aeture of drainage socks for filters.
One machine that may he used is a Piuut'!' t3 10-042 ultrasonic seam welding machine in which a workpiece is held between the sonotrode and the anvil wheel and welded continuously Llndcr prsure When welding contnuousIy by the ultrasonic niethod,The the material to be welded will he subjected to rapid changing pressure vibrations. The heat develops because of' molecular vibrations beneath the material surfhce, for thin materials within the immediate vicinity of'the actual weld. The machine further combines the physical procedures of' welding aiid cutting using a V-wheel, which seams and cuts in a single operation. The material itself' will he ftd from a roll via a ihider' (a metal, teardrop shaped device which takes the flat material, and doubles ii over to present it to the welding machine with the two edges together ready for welding).
An embodiment of the invent ion will now he described in the following
Example.
Example
A tubular micro fiber coalescing element is nade based on glass microlihers of 1 0 diameter 0.5-I 0ini and aspect ratio 500: 1 -4000: I using the moulding procedure of our GB-A-I 6035 1 9. fhe element has an inside diameter of' 75mm, an outside diameter of 9Smm and a length of' 250mm. Ii is impregnated with a pheno lie resin and cured in an oven, ailer which the ends are sanded flat. A drainage layer is formed by pulling over an outer drainage layer constructed from I antor 7239 (polyester hi-component non-woven fleece material) anti fbrnied into a lube by an ultrasonic hull weld. This gives a drainage tube with a very narrow seam width (1-3mm e.g. about 2 mm), and also siniultaneously cuts along the scam, hence removing excess material in the same operation. The drainage layer, when inspected by eye, has a uniform appearance without visible holes fl'om needling. [he resulting tubular structure is fitted with steel end caps to fOrm a filter element for in-to-out air or gas through-flow. The filter element is placed with its axis horiLontal in a filter housing and is challenged with air fI'oni an oil-lubricated rotary vane compressor. Aerosol cartyover is a measureillent of' how much contaminated air leaves the pump, hence an important factor when considering filter efficiency. From tests, it is found that the prototype described herein shows effective results The filler may also be used with its axis vertical instead of' horiLontal, e.g. as described in CB-B-226 1830.
Claims (7)
1. A tubular 1111cr for coalescing droplets of oil in a stream of gas, comprising an oil coalescing layer of' a niicrofihrous material and a second layer of an oil drainage material located downstream oft he first layer, said drainage layer being for receiving oil from the coalescing layer and prov ichiiig a path Iör oil to how by gravity from the tiller, charactericd m that the drainage layer is a butt-welded tubular structure.
2. The hilt er of cI aini I, wherein the outer drainage layer is a flofl-woven fl.lt or wadding thermally bonded by fusible hi- component fibers.
3. The 1111cr of claim I or 2, wherein the butt-weld in the drainage layer dehines a seal of width I -3 nini.
4. The tiller of claim 1, 2 or 3, wherein the coalescing layer is ofglass microhihers or oilier inorganic material.
5. A compressor or vacuuni pump provided with an oil-coalescing filler as defined in any ofclaims I-4.
6. A process for purifying air hrom a rotary vane compressor or vacuum pump which comprises passing the air through the coalescing filter of any ofclaims 1-4.
7. A cfrainage layer fbr the tiller of any of claims 1-4, comprising 1hric at least partially oh heal-hisihle material hull-welded to lbrm a tube.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0710151A GB2449846A (en) | 2007-05-29 | 2007-05-29 | A coalescing filter |
PCT/GB2008/050387 WO2008146045A1 (en) | 2007-05-29 | 2008-05-29 | Improvements in coalescing filters |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0710151A GB2449846A (en) | 2007-05-29 | 2007-05-29 | A coalescing filter |
Publications (2)
Publication Number | Publication Date |
---|---|
GB0710151D0 GB0710151D0 (en) | 2007-07-04 |
GB2449846A true GB2449846A (en) | 2008-12-10 |
Family
ID=38265431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0710151A Withdrawn GB2449846A (en) | 2007-05-29 | 2007-05-29 | A coalescing filter |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB2449846A (en) |
WO (1) | WO2008146045A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020174251A1 (en) | 2019-02-28 | 2020-09-03 | Psi Global Ltd | Filter cartridge and casing |
Families Citing this family (8)
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CN102172509B (en) * | 2011-01-25 | 2013-09-18 | 太原理工大学 | Ultrasonic electrolysis dehydrating method for fine coal |
US9144760B2 (en) | 2012-07-03 | 2015-09-29 | The University Of Akron | Liquid drainage from coalescing filter medium with drainage channels |
DE102014003486A1 (en) * | 2014-03-14 | 2015-09-17 | Berner International Gmbh | Filter cartridge for a safety cabinet and safety cabinet with at least one filter cartridge |
AT14696U1 (en) * | 2014-09-15 | 2016-04-15 | Ge Jenbacher Gmbh & Co Og | filter |
CN104383755A (en) * | 2014-10-08 | 2015-03-04 | 何茂林 | Oil gas filtering filter core and oil gas separation method |
WO2017092795A1 (en) * | 2015-12-01 | 2017-06-08 | Ateliers Busch S.A. | Vacuum pump with filtering element |
JP6647553B2 (en) * | 2016-03-01 | 2020-02-14 | Smc株式会社 | Filter element |
GB202209575D0 (en) | 2022-06-29 | 2022-08-10 | Psi Global Ltd | Filter Silencer |
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GB1519992A (en) * | 1974-07-03 | 1978-08-02 | Wafilin Bv | Membrane filtration element porous tubes |
US5910229A (en) * | 1996-07-25 | 1999-06-08 | Usf Filtration & Separation Group Inc. | Apparatus and method for integrally joining preformed thermoplastic core elements especially adapted for the continuous manufacture of melt-blown filter cartridges |
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GB2214837B (en) * | 1988-02-17 | 1991-09-04 | Process Scient Innovations | Oil coalescing filter |
JP4422799B2 (en) * | 1996-09-30 | 2010-02-24 | ポール・コーポレーション | Coalescer element |
US5814118A (en) * | 1996-11-18 | 1998-09-29 | Nuclear Filter Technology, Inc. | HEPA filter for venting chambers |
US8182569B2 (en) * | 2003-11-17 | 2012-05-22 | Donaldson Company, Inc. | Separator arrangement for gas/liquid separation; apparatus; and, methods |
-
2007
- 2007-05-29 GB GB0710151A patent/GB2449846A/en not_active Withdrawn
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2008
- 2008-05-29 WO PCT/GB2008/050387 patent/WO2008146045A1/en active Application Filing
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Publication number | Priority date | Publication date | Assignee | Title |
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GB1519992A (en) * | 1974-07-03 | 1978-08-02 | Wafilin Bv | Membrane filtration element porous tubes |
US5910229A (en) * | 1996-07-25 | 1999-06-08 | Usf Filtration & Separation Group Inc. | Apparatus and method for integrally joining preformed thermoplastic core elements especially adapted for the continuous manufacture of melt-blown filter cartridges |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020174251A1 (en) | 2019-02-28 | 2020-09-03 | Psi Global Ltd | Filter cartridge and casing |
Also Published As
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GB0710151D0 (en) | 2007-07-04 |
WO2008146045A1 (en) | 2008-12-04 |
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