US1745979A - Hermetically-sealed pump - Google Patents

Description

Feb. 4, 1930.

L. R. CALVERT IHERMETICALLE SEALED PUMP Filed Feb. 16, 1927 3 Sheets-Sheet l FIGQZ..

FIG.

TTORNEY Feb. 4, 1'930. L. R. cALv-Emf 1,745,979

HERMETICALLY SEALED PUMP Filed Feb. 16, 1927 5 Sheets-Sheet '2 2%/ ATTORNEY Feb.- 4, 1930. L. R. cALvERT HERMETICALLY SEALED PUMP Filed Feb. l1e, 1927 PUMP 3 Sheets-Sheet 3 ATTOR EY LANDON n. oALvEnT, or NEWARK, NEW

` larly those containingv a: gas f .Y vices in Which the w15 use ofargon gas, itis not possible to securey p, 0 employed, the

'with the' 011 c the vaporized medium suchV ashydrocarbon vapors which yvverei detrimental to theusefull STATES FAT-ENT;- ori-filon? g coifiPiiNY,Y A eoiaPoiaAfrroN-l or vPiiNNsYLwiNiuiA 'nnnMETicALLY-sEALPi) PUMP,

' Appiicationrfiiefi February 1e, 1927. serial No. 168,562. 'f

- This invention relatesto double fluid pumps and more particularly to a pump of such type employed in gas purification systemsffg f s f `5i In thev manufacture of electricaldevices Aand particu' employing gas lled envelopes filling such as argon,` nitrogen 'and other inert gaseous mix'- tures, it is essential that the gases be entirely freefrom contamination. 'v In the case of ar-` gon', for example, the same must be free from hydrogen 'and oxygen vvhich have a detrimental effect upon theoperationof. the degas is to be used. ln the such'gas in a sufficientlypurejstate for use in. an electrical*y device -as' above mentioned and ysystems have, therefore, which thelargonl gas1 is'fpassed through a suitable catalyst and through scrubbing or cleaning agents until eventually stored in a drum for subsequentv useas the environment in sealed envelopes'of various types of y electrical devices. y Y y l r D, In systems of the above charactenit is nec- The ness ofthe gas.

. v An object." of .the present'iinvention is,v

4therefore,

to providefa gas purification system in vvhichthe purified gas may be'stored at substantial' ypressure v'Without contamina` tion.,l i E Another objeetfof the 'nventions to pro- 4been used kin the pumping operation, thus' ina measure,'defeatingthe very purpose of vcome in con-1 vide ap'y'licable to suchy system asy a hermetical-ly sealed' part thereof. 0 c

,Another object of the invention is to procreating a difference in pressure sides of a closedk circuit.

Other objects andadvantages Will be more fully understoodfas the description proceeds.l

In carrying vout the present invention, IA provide a herinetica/llyv sealed. pump Which is applied to aclosed circuit and 'constitutes a at opposite part thereof to causera steady circulation Vof -l a fluid. The pump is so constructedthat no physical connection exists between the interiorr of the pump and the atmosphere, thus avoiding the possibility offleaks and a con-V tamination of thefcirculating medium.kr A Furthermore, the/pump is so-'con'structed that nopossibility of excessivepressure can.

occur even though the system might accidentally be closed,- the pump acting to rise tel a predetermined point and to remain; at a constant pressure even tho-ugh the outlet may be closed. Furthermore, internal contruction as to avoid maintenanceV or attention and may substantially free from Wear.

the pump is of such y have an indefinite operv ative life since it is so constructed as to -be tiiinsiiv,JissiefNoia fro vvEsriNeHoUsE LAMP vide a hermetieally sealed lduplex-pump for For the purpose of giving one practical ein-1 i" bodiment or application of the present invention, the same is described in connection with c ai gas purification system and Willbe `morei clearly .understood ,by .reference 1 to the A ac- `Y companyingdravvingsin which: o y .Fig. l is a front elevational' view ofthe pump embodying the present invention;- "Fig pumpshovvn in Fig. f1; Figi is a perspective a .flexible `pipe 'connection employed in ,the present-'pump construction ;k

Fig. 4 is a diagrammatic ofthe pump partly in section; and. v

Fig. 5 is a schematic representation of 'theA gas purication/system showing' theappli cation of the present pump thereto. Referringtoy Fig. l, a pump indicated as a Whole by strueted in accordance with thepresent in vention' comprising a elevational vievv f pair of cylinders `l() and 2 is a side velevational v'vievv of n detail vievv shovving i the .reference numeral' y9 'isY fcon-y c c me i g conductor 4later describedthrough a conductor 33 11, each of which is half filled with mercury `12 and 13. The cylinders are mounted upon a rockable cross-member 14 having a bearing 15 journaled on a shaft 16. The said shaft may be held in a bearing 17 secured to a suitable supporting structure or table 18'. The lower ends of the cylinders 10 and 11 may be connected by an arcuate communieating pipe .19 so that normally the levels of the mercury columns 12 and 13 Will: bethe same and a tipping or oscillation of the cross member 14 will cause a change in the said levels, causing the mercury in the respective cylinders to act as pistons.

Motion for actuating the Vcross-member 1 4 may be had through a link 21 connected to a crank 22 associated with a suitable speed reducing' mechanism 23, motion being transmitted from any desirable. source as a motor 24. Y v

The upper walls of the heads of the cylinders 10 and. 11 are 25 and-26 respectively which terminateV in a common'conductor 27 which extends downwardly and loosely encircles the shaft 16 'in a plurality of convolutions 23 which terminate in a portion 29 of the conductor 27 constituting the outlet side of the pump connected with apparatus to'beV later described. The encirclingA Aformation. of the conductor 27 about the shaft'l makes the same sutliciently resilient to permit a rocking of the structure support on the cross-member 14 without causing` any fatigue of the metal. Conductors 25 and 26V are provided with chambers 31 and 32 k.respectively which may be filled with aV suitable reducing material such as copper wool to prevent mercury vapor from passing through the system. Y

The other, or inlet side of the pump may be connected to theV system in a manner to vbe see F ig. 2) which encircles the shaft 16 by a series of convolutions 34 and extends upward'- ly inthe form of a conductor 35 and` is connected to across pipe 36 communicating with the conductors 25 and 26. The conductors 25 and 26 are provided with vertical check valves 37 and 38 respectively and the cross pipe 36,7which is in fact an extension of the 35, is provided with vertical check valves 39 and'4l. i. Y Y

Although a pump as above described may be applicable for various uses, it is especially adaptedas a booster7 in connection with a gas purification line such as diagrammatically shown in Fig. 5.

As illustrated,- this system operates to purify argon gas which may be initiallyY contained' in a container indicated by the num-eral 42; The gas then flows through pipe 43 to a compartment 44 containing' a suitable catalytic agent, thence` through a conductor 45 to compartments 46 and 47 contain-ing suitable purifying agentsv such as.V

provide dv with conductors y KOH and P205, thence through conductor 48 to a compartment 49 which may contain copper or other suitable reducing agent, through a conductor 5,1 and another compartment 52 containing P205. When the gas reaches this portion of the system, itis per'- mitted to iiowuntil a tank 53 becomes filled.V A valve 54 may then be closed and the gas in the tank 53 may be circulated through a com- Y partment 55 containing calcium and another compartment 56 containing P205. For this purpose,the present pump 9 is provided as part of the system. Conductors 33 and 35 of the pump may then be connected'to this circulating system, the conductor 35 being in communication with a conductor 58 leading back to the calcium tank 55 and the conductor 33 being connected by a conductor 59 to. the tank 53. It will thus be evident that an operation of the pump will cause a circulation of the gasin the iinal purifying4 system untilthe gas'infthe tank 53 has reached a state of purification, whereupon it may be removed through pipe 61 for use. The state of purification ofthe gas may be determined by periodic tests.

When the present pump is applied tothe above described system` itsk operation Vis as follows:

Assuming that the cross-member 14 is rocked so that the cylinder 10 is elevated as shown in Fig. 4, the mercury will thenl flow through the pipe 19 and the cylinder 10 will be partly or entirely emptied andthe cylinder 11 filled or partlyl filled withthe mercury. Suction Will, therefore, be produced in the cylinder 10v and the check valve 37 will` be closed. The check valve 39 will, however, be open admitting sure in' cylinder 11 will close the check valve 41 and open the check valve 38, thus discharg- Ving gas through the pipe or conductor 27.

lVhen the cylinder 10 descends and the cylinder 11v isV elevated, it is obvious that the mercury will How into the cylinder 10. The Vpressure in the cylinder 10 will, therefore, close the check valve 39 and open the check valve 37 dischar fing gas through the outlet pipe while the suction in cylinder 11, will close the valve 38 and open the valve 41 thus producing a constant pumping operation. The pressure exerted is directly in. proportion to the length of thevstroke produced from the-link21, that is, ference in height of should the pump be outlet. The volume discharged is, however, proportionate to the sizeof thecylinders l0 and 11 and the speed of the'driving mechanism 24..

It will be evident that the pump alternates between producing suction and then producing compression and on the suction stroke the suction check valves 39 and 41 open lonY the, discharge stroke the compressionfcheck the two mercury columns gas to the cylinder 10and the pres-V working'against a closed in proportion to the dif-V ofcontamination by the circulating means.

y and. although it is foundthat the mercury 1 valves 37 4and 38 open. Thus a 4continuous' 1,745,979 l ,i l 3,

operationV of thepump is attained and a constant flow of the pumped fluid' is attained.

rlhe simplicity off the present pump together withl the loW cost'of manufacture makes the ksame of particular advantage in gas purification systems and it Will be appreciated that if desirable, one pump maybe Vused in connection With a systemfor purifyinggas in the tank 53 While the valve 54 isl closed and that during vthe operation of this pump, gas may be permitted'to flow through a conductor 62 toa system including a tank g similar to the tank 53 in Which 'another pump may be located, thus When the tanlr53 con` tains a supply of pure gas at the required pressure the, same may be lused and a valve 63 Y Y in the'conductor?, may be opened to fill another tankiin another final puriica'tion system including `another pump. It is obvious from the foregoing, that 'any 'number of pumps f may be thus employed in the form of a battery, depending upon the capacity of the outputdesired. V It Will readily be seen that by reason of v the present invention a gas purifying system or any other system in which it is necessary to maintain a gas circulation, the gas may be caused to floW and stored aty a substantial pressure for subsequent use Without danger I n the present specificexamplefin Whichargon l y' .tween said compartments, ashaft for rockably supporting said support, inlet andvout-f is purified, considerable'advantage is de' rived since the argon gas is merely circulated over a relatively small surface of the mercury vapor isV practically negligible, aV small amount of puremercury vapor does not have Aany detrimental or contaminating effect upon vcompartment disposed at opposite endsl of said member, a communicating passage'beif let conduitsfor said compartments, said conmeans for pivotally supporting saidV member '60 at a point intermediate vthe yends thereof, Aay

rvduits being spirally disposfedfabout said shaft to prevent detrimental stressinsaid conduits during a movement ofsaid compartments.y

2. A pump comprising 'a'y cross-member,

compartment at each end of said cross-member, f a communicating passage between said compartments, inlet and outlet conduits yfor said compartments, means for rocking saidA cross-member, said conduits' having convolutedportions to prevent detrimental stresses being, imparted to said conduits during the l movement of said cross-member.

3. A pump comprising a rocker-member, a plurality ofcompartments mounted on said v member and vmovable therewith, a communicating passage between said compartments,

Va liquid body in said compartments and kpas- 1 sage, means for actuating said rocker-member to cause a movement of said liquid body and` y'alternately produce suction and compression in said compartments, inlet and outlet conduits for said compartments, said conduits having convoluted portions to prevent detrimental'stresses therein during a movement s '4. A. pump comprisinga plurality of com- Y.

of said rocker-member.

partinents partially occupied by afmetallic liquid, a cross-member for supporting saidl comparments at opposite ends thereof, a coni ductor communicating With said. compartments, a shaft for pivotally supporting said cross-member, means for automatically rocl- I ing said cross-member to change the position of said liquid to create a vacuum alter` nately in said compartments, inlet and out-v letl conduits for said compartments, eachof said Vrconduits having ,convoluted portionsl about said shaft` to Yprevent detrimental stresses y.Wit-hin said ,conduits during movement of said cross-member. f y a c 5. A pump of the class described comprisv'ing two compartments, a communicating passage connecting said compartments, a meyso' tallic liquid insaid compartments and said 'l passage, afluid conduit between said compartments, acommon inlet conductor connected to said compartments, a common outlet conductor for said compartments, ,a rockable supporting member for said compart` v ments, a source ofenergy for rocking said lmember, means for connecting said member to said source of energy for automatically. actuating said member to cause a yrelative movement of said liquid for alternately ef?Y fecting suction and compression in said comi partments and valves in said inlet and outlet conductors operable to close during the compression period and open during the suction period, said inlet being yprovided With 'convolutions' disposed `about the axial line of movement of saidsaid conductors during movement of vsaid 'member'.

In testimony Whereof,I have hereunto sub-l i' and*` outlet conductors* member to prevent detrimental stresses in scribed my name this 15th' day of February LANnoN R. cAiivERr isc

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