Патент USA US2404621код для вставки
July l23„ 1946.` E. W. DAVIS GREASE STRAINER Filed March s1, 194s ' 2,404,621 .2,404,621y Patented -ÍuÍy 23, 1946 'UNiTED STATES . PATENT ÃCFFIIZE; . 2,404,621 ' f ' GREASE STRAINERx Y n A n x Ernest vW. Davis, River Forest, Ill., assignor to Stewart-Warner Corporation, Chicago,> . Ill., a corporation ofvVirginia l. .1 Application `Maren 31, 1943, -serial N9. 481,221 f 4c1aims. (o1. 21o-_166) My invention relates to strainer , and more particularly to strainers for separating particles _ E, and an outlet 8, with a grease passageway I0, extending from the `inlet 6, to the outlet 8. The cylindrical portion I2 is bored at each end to re ceive a loosely fitting screening element I4, `hav ing end pieces I6 and I8, held in position by the connecting rod 2l) which serves to hold the cylin-V drical screening member from collapsing longi yof foreign matter from grease discharged into a high pressure grease line, leading to a plurality of metering devices in a centralized` lubricating system adapted to proportion the ñow of grease to a, plurality of bearings. The prior art dis closes many such centralized lubricating systems, , tudinally. The openings 22, 22 in th'e end piece I6;v permit the passage of greaseV to the interior vfor which the strainer of this invention is well adapted. 10 of the screening element I4. The necessity for such a, strainer is obvious when it is considered that practically all com Y The passageway I Il includes a port disposed be tween the inlet and the outlet and controlled by a sphericalcheck'valve 24. The spherical valve mercial lubricating .greases co'ntain particles of lint, scale, grit, libres, and other extraneous sub 24 is normally held off the valve seat 26 by the stances, the adverse inñuence of which may pre 15 end thrust of the connecting rod 20, which is vent continued successful operation vof the afore urged in Va direction towards the valve 24 by said metering devices. Unlike oil, grease does means ofv the compression spring 28. The not permit such impurities Vto settle by the action ' screening element I4,.and spring 28 are assem `of gravity, and as the methods of handling grease wbled in` the body memberllA through the threaded are generally less >conducive to cleanlinessl than 20 opening 30, which isA then closed by the remov the methods ordinarily used in dispensing oil, the able „closureplug 32. The valve 24 is assembled necessity of installing a strainer in a grease line in the body member 4 through the threaded open is quite obvious. > ing 34A which is then sealed by the removable The strainers heretofore used for this purpose closure plug.36. l ' -' ' vcomprise a hollow body member containing a, wire 25 screen., The body member is often supplied’with <a removable. plug to facilitate convenient removal of the screen when cleaning is necessary. Such The operation of- this strainer is as follows: , Grrease- ñowing through the inlet 6 passes around the valve 24,*through the openings 22, 22, into the screening element I4, through the interstices of the screening element I4 and out through the strainers are quite satisfactory if they are cleaned before they become clogged with impurities, but 30 outlet 8. ' Particles _of foreign substances in the in actual practice they are usually neglected.. grease are separated from the grease as it passes Then when the screen becomes cloggedwith irn through the _screening element I4, so that grease purities, thevhigh grease pressure, which may be discharged through the outlet 8 is relatively clean. thousands of pounds per square inch, bursts the After longA continued service the screening ele screen and .allows the accumulated mass of im purities to travel along with the ñowing grease to the metering devices, which' then become in operative. » _ v v 35 ment I4 may become clogged with the aforesaid particles', whereupon the differential grease'pres sure across the screening element I4 causes the Y The principal object of this invention is to pre .entire screening element I4 to move downwardly .vent this objectionabley bursting of the screen. 40 and towards'the right, thereby compressing the spring 28, and thereby permitting the valve 24 to This object is accomplished by incorporating a close against the valve seat 26, so as to prevent valve in the body of the strainer, which Valve is in series with the screen, _and by providing means, operative upon partial clogging of the strainer, for closing the valve. " Referring to the drawing: further passage of grease through the screening element Í I4. Since greaseis» a relatively viscous fluid it will tend to carry the valve 24 toward its seatV 26 even though the strainer body be inverted with respect to the position in which it is shown in Figs. l and 2. Figure 2 is a sectional side elevation of th‘e The ~degree of clogging of the screening element same, the section being taken on the line 2, 2, in 50 I4 which will cause the valve 24 to close, will, Figure 1; and of course, depend upon a number of factors, but, Figure 3 is a similar section of a modiñed form in ultimate analysis, the valve 24 will close when of the strainer shown in Figure 2. the differential pressure on the opposite sides of The body member 4 is preferably constructed the end piece I8 is sufficient to compress the of air furnace iron, and is provided with an inlet 55 spring 28 to the extent ’necessary to remove the Figure 1 is an end elevation of the strainer of this invention; 2,404,621 3 an end wall on the other end of said screening ` In practical use of the invention the spring 28 element, means extending rigidly from said Ul screening element into engagement with said will be made suñiciently strong to hold the valve 24 open until the screening element I4 is sub stantially clogged, that is, when so many of its valve and serving to hold the valve open at one limit of movement of said screening element, and interstices are plugged with foreign _matter that the lubricating apparatus in which the strainer spring means urging Asaid ‘element tóward. said is incorporate-d has its `grease ñow rate notice ablyreduced due to the increased resistance toV grease flow through the strainer. It will be noted that the portion of vthe bore through the cylinf-> 4 now ofA fluid from the inlet toward said screening element and seating in the direction of said ñow, end of the rod V20 as an obstruction to the seating of the valve. iiinìit.> " ^- ’ ' ‘ n 3. In a strainer device, the combination of a body member havinginlet and outlet openings - ' adapted for connection with conduit means, said drical portion l2 is in free Vcommunication with body member havingua bore extending at an angle to YVthe axis of Ysaid outlet withV one side of said Vthe outlet opening 8 through a hole 31. When this strainer is usedv in a hand operated - fbbre open vto -said outlet andwith a port atene` vend of the bore opening to the inlet, a screening _ greasing system, th’e inability of thev operator to force grease through the systemnotiñes himthat , ,element Vhaving apervious cylindrical wall dis the strainer is clogged and needs cleaning. In the embodiment illustrated in Figure 3,-av semi-spherical valve 38 yis screwed on the con nectingv rod '23. The operation of this strainer is posed in said bore, the bore providing guide means for 4limited movement of the screening element in the'same as that kof the >strainer illustrated in inlet through said port,„sa'i`d fluid’l being.' :dis-V charged to the outlet through said pervious wall of the -screening element, a valve seat at said port the direction of its axis, one end of said screen ing element'bein'g open to receive Vfluid from the Figure 2,'except that the valve 38 is closed by the ~ connecting rod 20„instead of being closed by Y movementfoi` the grease. Y and -a valve cooperating therewith to control the ñ‘o‘w of fluid vfrom said inlet toward said outlet, said valve seating in the direction of ñow toward the open endbf the screening element, an end wall on the otherend of said screening element, means extending rigidly from said end wall into . Without. furtherÁ elaboration, the foregoing will . so fully explain my invention that others may, by applying knowledge ¿current at „the time of appli cation, readily adapt the same for use under vari ous conditions of service. I claim: _ ' ' ' engagement with said valve and serving to hold " the valve open at one limit of movementy of said l. In a strainer device, the combination of a body member having inlet and outlet openings screening element, spring means-urging said ele with a passage .connecting them for flow of 'fluid from said outlet to said inlet, said passage in- 1., ment toward said limit, and a plug closing one end of said boreand removable to permit removal cluding a port, a valve seat around said Dort, a check valve movable 'inthe direction of flowto engage said seat and close the port, »a screening of the screening element. ' - Y - y ~ „ 4. Ina strainerrdevice, the combination of a body member having threaded inlet and outlet openings in' v'substantiallyV ax-ialY alignment and element interposed in thelpassagevbetweensaid having a boreextendin'g at an angle to the com check valve‘and the outlet and slidable toward and from said port, spring means urging the mon axis of said inlet and outlet, said bore having screening element toward the port, and means one side open to the outlet and having a port' at extending from said screening element into en« gagement with the valve and operative to hold one end opening to the inlet, a screening element including a pervious cylindrical wall disposed in that the pressure of fluid entering at the inlet is ininthe direction VofV its axis, a valve seat at said port andy a valve cooperating therewith to control now of'iiuid from said inlet toward said outlet, said valve seating in thevd-irection of flow,~the Y the valve open until -the screen becomes so clogged p. ‘ said bore and guided for limitedl movement there- , sufficient to Ymove the screening element away from the port in opposition to said spring means. V2. Ina strainer device, the combination of a body member having a flow passage for ñuid ex end 'of said'screening element `toward the port being _open to receive fluid from the -inlet'and said liuid being discharged through said pervious tending through it, with inlet and outlet openings respectively at opposite ends of said passage' and in substantially axial alignment, a screening ele ment having a pervious cylindricall wall and dis posed with its axis at an angleY tothe common axis of said inlet and outletfone end of said screening element being open to' receive fluid from the inlet-end Vof the passage and said fluid being` discharged through said pervious wall of the screening element into the passage and toward its outlet, guide means in said body mem ber in which the screening element isfmounted for limited movement in the direction of its axis, a check valve in the passage and a seat therefor disposed adjacent the lopen -end of the screening 5615 element, said valve ybeing adapted'tó control the Wall of the screening element to the outlet, means extending ¿rigidly from said screening element into engagement` with the valve andfserving'to hold thevalve openrat one limit of movement >of said screening element, a threadedplug clos ing one end ofthe bore, a- spring reacting between said plug and >the screening element urging _said element toward said limit of its movement and normally holding the valve- open, the removable threaded plug being dimensioned to permit re moval of the spring and rscreening element‘from ‘ thebore. ERNEST __ W.A DAVIS.