Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS2974749 A
Publication typeGrant
Publication dateMar 14, 1961
Filing dateMar 5, 1958
Priority dateMar 6, 1957
Also published asDE1122786B
Publication numberUS 2974749 A, US 2974749A, US-A-2974749, US2974749 A, US2974749A
InventorsFrancois Donguy Rene Pierre
Original AssigneeCommissariat Energie Atomique
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Devices for holding filters intended to stop particles in suspension in gaseous streams
US 2974749 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

March 14, 1961 R. P. F. DONGUY 2,974,749

DEVICES FOR HOLDING FILTERS INTENDED TO STOP PARTICLES IN SUSPENSION IN GASEOUS STREAMS Filed March 5, 1958 United States Patent 0 DEVICES FOR HOL-DING FITERS INTENDED TO STOP PARTICLES IN SUSPENSION IN GASEOUS STREAMS Ren Pierre Francois Donguy, Vanves, France, assignor to Commissariat a IEnergie Atomique, Paris, France, a state administration of France Filed Mar. 5, 1958, Ser. No. 719,305 Claims priority, application France Mar. 6, 1,957

3 Claims. ((1183-62) The present invention relates to devices vfor holding filters intended to stop particles in suspension in gaseou's streams, and in particular in gaseous streams under pressure. The invention is more especially concerned with such devices for holding ilters intended to stop radioactive particles.

The chief object of the present invention Vis to provide k a device of this kind which is better Iadapted to meet the requirements of practice, and in particular which permits of easily replacing a used filter by a new one.

According to the present invention, this device includes twotubular sockets adapted to be xed in vgastight fashion on the respective ends lof two portions of the circuit through which said gaseous stream is ilowing, each of said sockets being provided witha central passage forming `an extension `of the vcircuit portion on which said socket is xed, said central passage forming an orifice in the face of said lastmentioned socket located 'l Opposite-the other `of said f'sockets, the 'respective outer side walls of Lsaid two sockets ,being 'located in a common cylindrical surface, said two sockets being rigidly assembled together in line'with each other through means provided with "at least one aperture suflicient to permit passage of a iilte'r therethrough, means operable from a distance being provided on 'at leastone of saidsockets for removably lixing a filter on said orifice ofV one of said sockets so as tightly to apply the periphery of said orice against the edge of said orifice, a cylindrical Vsleeve being tted on the outer side walls of both of said sockets, said sleeve being slidable along said sockets, whereby said sleeve can occupy either a position in which it surrounds bothV of said sockets or a position in which it surrounds only one of said sockets, and means being provided for sliding from a distance said sleeve with respect to said sockets. Y- v Preferred embodiments of the present invention will be hereinafter described with reference to the accompanying drawing, given merelyby way of Yexample and in which: i Y

Fig. 1 is an axial vertical section of a filter holding device according to the invention, saidV device being;

shown in working position.

Fig, 2 is an elevational View of the same device'withl the coveringsleeve lowered Vin order to permit replace- 2,974,749 Patented Mar. 14, 1961 Vice 2 to the filter and involves the risk of having him exposed to radiations or to cause him to absorb radioactive aerosols. Furthermore, such an operationV is often delicate since vthe mechanism for opening the lter-holder must be provided so as to ensure a very good lluidtightness, not only to the dust conveyed by the gas but also to the high pressure thereof.

lIn the embodiment of the present invention illustrated by the drawings, the filter-holder includes two sockets 4 and S in the form of cylinders of revolution xed, for instance by welding, on the ends of the portions 2 and 3 of the gas circulation circuit.

rIhese two sockets 4 and 5 are rigidly assembled together by means of elements 6 provided with apertures and constituted for instance by portions of a jacket in the form of a cylinder of revolution secured on said sockets d and 5 by means of screws 7 and provided with Wide apertures 8.

Of course, the whole of elements A4, 5 and 6 might be made of a single part provided with suitable apertures.

Filter 1 is mounted on a ring 9 one end of which is screw-threaded so that it can be screwed on a cylindrical projection lil of socket 5 (which is provided with corresponding screw-threads). The other end of `ring 9 is adapted to support the periphery of the lter i1 yand to apply it, in a dust-tight fashion, against a at annular joint 11 mounted in fa suitable housing of socket d.

'Ring 9 is advantageously provided withradi'al holes 12 diametrally opposed.

The side walls of sockets 4 and 5 are provided with annular grooves in which are mounted toroidal-shaped packing members 13 intended to be applied against the inner Wall of a sleeve 14 in the form of a cylinderiof revolution the inner diameter of lwhich is substantially equal to the outer diameter of sockets 4 and 5, said sleeve 1-4 vbeing capable of supporting the pressure of the gas tofbe treated.

The outer wall of sleeve 14 is Vprovided'with an annular projection 15 provided with -a hole 16 parallel to the axis of said sleeve.

vvSleeve 14 is further provided with a longitudinal notch :17 capable of guiding a pin 18 rigid with socket 4. It lfurther includes an abutment 19 to limitits upward movement with rmpect to socket 5.

Sleeve 14 and socket 4 are provided with respective apertures 2t) and 21 adapted to come opposite one another when the sleeve is in position around the two sockets. A key 22 can then be introduced into these holes so as to lock the sleeve in position on the sockets.

If it is supposed that initially the filter-holder is in this working position (Fig. l), the removal of a lter to be replaced by a fresh one can be effected as follows:

The inflow of gas through conduit 2 is cut otl.L

Key 22 is removed.

The curved ends of two rods 23 are engaged into holes 16 and these rods are pulled in a direction parallel to the axis of sleeve 14, which causes this sleeve to slide "with respect to sockets 4 and 5 and to disclose the aperof a` circuit through which circulates a gas under pres'- sure in which radioactive aerosols are in suspension.

It should tirst be reminded that, in theltering of such a gas (which may for instance .be the coolant gas "of a nuclear reactor, or `a gaswhich had been in contact vis a dangerous operation becausetheir removal requires the use of tools Ythe standard dimensions of which are drop in a suitable vessel.

relatively small, which compels the worker to be close turcs '8. The use of ya grease including some amount of silicon permits of ensuring a good sliding of the sleeveV ,with respect to the sockets even at high temperatures.

` A rod 24, of relatively great length, is inserted vthrough one of these apertures 3 into two corresponding radial apertures 12 of ring 9, and this rod is rotated about the axis of the ring so as to screw said ringon projection.V 10, which, releases the vi'ilter. y

It suliices then kto displace this iilter to cause it to yAll these operations can be effected without difficulty and by meansof very long rods, whereby the hands of the operator, and the operator himself, are at a distance such from the filter that the noxious e'ects thereof are sufiiciently attenuated. Y

The mounting of a new'filte'r is then obtained by efcting the above mentioned operations in the reverse or er.

At the end of the upward movement of sleeve 14, notch 17 engages lug 18 so that holes 20 and 21 are in register and permit the introduction of the locking key 22.

4It should be noted that the device according to this invention gives a very good gas-tightness. In particular, the pressure of the gas circulating through the device cannot displace sleeve 14 because this pressure exerts a radial effort which is perfectly balanced.

However, the removal of the filter is very easy since the periphery of said filter is not applied in a very strong manner against joint 11, this application being intended to ensure gas-tightness only for the very small difference between the pressures existing on the Irespective sides of the filter.

The lter may be made of any suitable material such as paper, glass wool or silica wool, sintered material, etc.

By way of example, it is indicated that a filter having a useful area of 9 sq. cm. and a thickness of 4 mm., mounted on a support made according to the invention, was inserted in a gas circulation circuit where the pressure was 18 kg./sq. cm. No leakage was detected.

A particularly interesting application ofthe invention consists in introducing a filter mounted in such a support in a conduit for collecting the coolant gas from a nuclear reactor, upstream of a counting device, in order to stop the radioactive aerosols which might deteriorate some parts of said counting device.

'In a general manner, while I have, in the above description, disclosed what I deem to be practical and efcient embodiments of my invention, it should be Well understood that I do not wish to be limited thereto as `there might be changes made in the larrangement, disposition and form of the parts without departing from 40 the principle of the present invention as comprehended within the scope of the accompanying claims.

What I claim is:

1. A device for holding la filter intended to stop particles in suspension in a gaseous stream, which device comprises, in combination, two tubular sockets adapted to be fixed in gas-tight fashion on the respective ends of two portions of the circuit through which said gaseous stream is owing, each of said sockets being provided with a central passagemforming an extension of the circuit portion on which said socket is iixed, said central passage forming an orifice in the face of said last mentioned socket located opposite the other of said sockets, the respective outer side walls of said two sockets being located in a common cylindrical surface, means for rigidly assembling said two sockets together in line with each other, said means being provided with at least one aperture sufiicient to permit passage of a filter therethrough in a direction transverse to the common axis of said socketsmeans operable from a distance on at least one of saidsockets for removably fixing a filter on said orifice of one of said sockets so as tightly to apply the periphery of said -filter against the edge of said orifice, a cylindrical sleeve fitting in gas-tight fashion on the outer side walls of both of said sockets and slidable longitudinally therealong, whereby said sleeve can occupy either a position in which it surrounds both of said sockets or a position in which it surrounds only one of said sockets, and means operative from a distance for sliding said sleeve with respect to said sockets.

2. A device according to claim 1 in which the outer side walls of .said sockets are provided with grooves, further including toroidal-shaped joints inserted in said grooves and intended to be -applied against the inner wall of said sleeve.

3. A device according to claim 1 in which the means for removably fixing the filter include a ring screwed at one end on one of said sockets and `adapted at the other end to support the filter and to apply it against the other socket.

References Cited in the file of this patent UNITED STATES PATENTS 974,519 Reynolds Nov. l, 1910 991,572 Weisensten May 9, 1911 1,237,482 Dalen Aug. 21, 1917 1,747,882 Prazmo Feb. 18, 1930 2,517,518 Williams Aug. l, 1950 FOREIGN PATENTS 9,953 Great Britain Apr. 30, 1898 una

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US974519 *May 4, 1909Nov 1, 1910George T ReynoldsGasolene or oil filter.
US991572 *Mar 30, 1910May 9, 1911Simon P WeisensteinAir-filter.
US1237482 *Jan 5, 1916Aug 21, 1917American Gas Accumulator CompanyRegulating device for gas-conduits.
US1747882 *Feb 1, 1928Feb 18, 1930Prazmo KazimierAutomobile exhaust-gas purifier
US2517518 *May 29, 1945Aug 1, 1950Cons Vultee Aircraft CorpHydraulic apparatus
GB189809953A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3325980 *Nov 19, 1963Jun 20, 1967Alsacienne AtomDevice for providing relative leaktightness between two parts which are movable withrespect to each other
US3362141 *May 13, 1966Jan 9, 1968Atomic Energy Commission UsaSurface contamination sampler
US4178794 *Feb 28, 1978Dec 18, 1979Union Carbide CorporationEnvironmental sampling device
US4459140 *Nov 8, 1982Jul 10, 1984The United States Of America As Represented By The United States Department Of EnergyFilter apparatus
US4822386 *Nov 27, 1987Apr 18, 1989United Technologies CorporationFilter replacement mechanism
US4841628 *Dec 21, 1987Jun 27, 1989United Technologies CorporationFilter replacement mechanism
U.S. Classification55/478, 376/313, 976/DIG.378, 55/357, 55/511, 976/DIG.266
International ClassificationG21C19/30, G21F9/00, B01D46/00, B01D46/10, B01D46/30, F16L55/24, G21C19/28, G21F9/02
Cooperative ClassificationG21F9/02, G21C19/30, B01D46/00, F16L55/24, B01D46/10, B01D46/30
European ClassificationF16L55/24, G21C19/30, B01D46/10, G21F9/02, B01D46/00, B01D46/30