US2630072A - Pump - Google Patents

Description

March 3, 1953 A. J. FAUSEK ET AL 2,630,072

PUMP

Filed Feb. 28, 1949 3 Sheets-Sheet 1 t INVENTO'RS ARTHUR J. FAUSEK IRWING F. FAUSEK ATTORNEY fimw U "M 5 m U U N 0 e N A A R 0 ,e EFF m h V 3 S N F T no! .mw .i q A 2 8 RG 1% mu S l Tw 5 R R Y B A. J. FAUSEK ET AL PUMP g t: m 05 w March 3, 1953 Flled Feb. 28, 1949 Patented Mar. 3, 1953 PUMP Arthur J. Fausekand Irwing F. Fauselt; Clayton, Mo.

Application February 28, 1949, Serial No. 78,852 6 Claims. (01. 1c3 3) This invention relates generally to pumps of the reciprocatory, displacement type and more specifically to such a pump which is adapted for use in displacing highly volatile liquids, such, for instance as liquid oxygen, the predominant object of the invention being to provide a displacement pump of the type referred to which includes valve means for releasing from the cylinder of the pump vapor which is produced therein without intention and which if not released from the pump cylinder might interfere with efficient operation of the pump.

Prior to this invention considerable diiiiculty was experienced in the use of reciprocatory dis placement pumps in pumping highly volatile liquids, liquid oxygen, for instance, because of the fact that the liquids were maintained very close to the vaporization point and when subjected to pressure during the pumping operation, or for other reasons, suflicient heat was developed to cause some vapor to be produced within the cyllinders of the pumps. As a result of the presence of such vapor within the cylinders of the pumps vapor locks were heretofore created within the cyhnders of the pumps which seriously interfered with efficient operation of the pumps, and in some cases produced hazards' which frequently caused damage to be done to the pumps.

The main purpose of this invention is to provide an improved pump of the reciprocatory displacement type in the operation of which the difficulties recited above are eliminated, this purpose being accomplished by providing the improved pump with valve means which is automatically actuated to its open position at the proper time during operation of the pump so as to release from the cylinder of the pump any vapor which may be present within the cylinder of the pump. 7

Fig. 1 is a vertical sectional view of the improved pump of this invention, a portion of the tank with which the pump is associated being illustrated fragmentarily.

Fig. 2 is a vertical section view similar to Fig. 1 but showing a modified form of the invention, Fig. 2 being drawn to a larger scale than is Fig. 1.

Fig. 3 is a fragmentary sectional view illustrating another modified form of the invention.

In the drawings wherein are shown for purposes of illustration, merely, several embodiments of the invention, A designates in Fig. 1 the improved pump generally. The pump A includes a cylindrical housing I which is provided at one of its ends with anendwall 2 andwithan outwardly extended, annular flange 3, said housing at its opposite end being provided with an annular flange 4 which abuts against a head 5 that closes said opposite end of said housing. The housing I is supported by a tank T which contains liquid to be pumped by the pump A, there being suitable fastening devices 6 which secure said housing I to a wall of said tank, and a conductor 1 is provided which places the interiors of the tank T and the housing l in communication with each other. Also, suitable fastening devices 8 are employed for securing the annular flange 4 of the housing l'to the head 5, these fastening devices 8 serving additionally to secure a plate 9 to the outer face of said head 5.

Disposed within the housing I is the piston cylinder N3 of the improved pump A, said piston cylinder having a rearwardl extended portion H of cylindrical shape in cross-section which is provided at its rear end with an annular flange [2 that abuts against the forward face of the head 5, suitable fastening devices l3 being employed for securing said annular flange i2 to the head, and said fastening devices It being extended through the plate 9. Arranged for reciprocatory movement relative to the piston cylinder Iii is a piston l4 whose forward end portion is disposed within said piston cylinder, said forward end portion of said piston being of sufiiciently less diameter than the bore of the cylinder to provide an annular duct 15 within the bore of the cylinder between the wall of said cylinder bore and the circumferential face of the forward portion ofthe piston. I

The piston i4 is supported for reciprocatory movement in part by a stuffing box structure it which includes a gland ll that is screwthreadedly received within a screwthreaded cavity it formed in the piston cylinder It, the piston being extended through'an openin i'i' formed through the forward portion of the gland ll and said gland being adapted to force a body of packing material IE] into fluid-tight contact with the circumferential face of the piston. The rear portion of the piston It is received within the forward portion of an elongated sleeve 20, and the rear portion of said sleeve receives therein the forward portion of a piston rod 2l, there being a body of suitable heat insulating material 22 interposed between the wall of the bore of the sleeve and the circumferential face of the piston rod, and between the forward end of the piston rod ,and the rear end of the piston. The piston I4,'the elongated sleeve 20, and the pieton rod 2! reciprocate as a unit, such unit being supported for reciprocatory movement by a stufiing box 23 which comprises a screwthreaded gland 2G through which the sleeve 29 extends and which is received within a screw threaded cavity 25 formed in the head 5. The gland 2d of the stufiing 23 is adapted to force a body of suitable packing material 26 into fluid-tight contact with the circumferential face of elongated sleeve 29.

The elongated sleeve 29 is provided at its for ward end with an outwardly extended, flange 2! which is spaced apart longitudinally of the piston from a similar. outwardly extended, flange 28 that is formed on the piston i i. The related flanges 21 and 28 support arms 2;) and 38 which extend outwardly in opposite directions with respect to the piston It, bolts 3! being employed to secure inner portions of said arms between the flanges 21 and 23, and these bolts also serving to secure the elongated sleeve 29 to the piston i i. The arm 29 has mounted thereon at its outer end by means of nuts 32 a forwardly extended rod 33 which serves a purpose to be hereinafter set forth. Also, the arm 30 has formed therethrough an opening 34, the purpose of which will be hereinafter explained.

The forward end of the pump cylinder it is closed by a head 35 which is secured in place by fastening devices 36, and associated with said pump cylinder at a point adjacent to said head 35 is an intake valve 37. The intake valve 371 comprises a valve body 38 which is crewthreadedly received in a screwthreaded opening 39 formed in the pump cylinder wall, said valve body having associated therewith a valve stem ie that is provided with a valve head ll at an end thereof. The valve stem G has associated therewith a coil spring 42 which is disposed under compression between the outer face of the valve body and a washer 43 that is mounted on the valve stem through the instrumentality of a nut 4s. The coil spring 42 urges the valve head toward its closed position where it contacts with a valve seat & at the inner end of the valve body 38, and at the inner end of the opening 39 there is arranged a perforated wall it. Also, the valve body 36 i provided with openings M which are open at the outer end of said valve body and communicate at their inner ends with a cavity it formed within the valve body.

Mounted for pivotal movement on a supporting arm 49, by means of a pivot 5B, is a lever M which is provided with an extension 52 that engages the outer end of the valve stem 45 of the inlet valve 31. The lever 5| is of tapered shape, having an inclined face 5! in which an arcuate seat 53 and a seat 54 are formed. One or the other of the seats 53 and 5d receives a roller 55 that is rotatably supported by the outer end por tion of a link 56, the inner end portion of said link being pivotally attached by a pivot element 51 between a pair of ears 58 that are extended from the pump cylinder 59. The link 56 has pivotally connected thereto, by a pivot element 59, a rod 60, said rod being extended through the opening 34 formed through the arm 30, which has been previously referred to herein. Also, the rod 60 has fixedly mounted thereon a collar 6! and a collar 62, said collars being arranged in spaced relation and being intended for a purpose to be hereinafter explained.

Arranged in opposed relation with respect to the intake valve 31 is an outlet valve 63 which is similar in construction to the illustrated intake valve 37. In other words. the outlet valve 63 includes a valve body 64 which is screwthreadedly received in a screwthreaded cavity E55 formed in the wall of the pump cylinder, and with which is associated a valve stem 66 having a valve head said valve stem being provided with a coil spring 63 which tends to draw the valve head Bl of the outlet valve to its closed position in contact with a valve seat 69 located within the valve body 6d. The outer end portion of the valve body 5:3 is internally screwthreaded and this outer portion of said valve body screwthreadedly receives a bushing it that is provided with an opening 16' which communicates with the cavity G l within the outer portion of the valve body 65. Also, the valve body 64 is provided with passageways H which are open at the inner end of the valve body and through which liquid medium moves during its passage from the bore of the pump cylinder through the outlet valve 63.

Connected into the bushing it is a discharge conductor 72 for conducting liquid medium pumped by the pump A to a place of disposition of such liquid medium, there being a packing gland 73 for forcing a body of packing material it into tight contact with the outer face of a portion of the discharge conductor and with a portion of the bushing ill so as to avoid leakage of liquid medium between said parts. Also, the discharge conductor 52 extends through an opening formed through the head 5 and a packing gland i5 is provided which acts against a body of packing material E6 so as to prevent leakage of liquid medium between the circumferential face of the discharge conductor and the wall of the opening through the head 5 through which said discharge conductor extends.

The improved pump of this invention includes a third valve ll which is located adjacent to the rear portion or the pump cylinder it. The valve ll is a apor discharge valve and it comprises a screwthreaded valve body 78 which is received in a screwthreaded cavity 19 formed in the wall of the pump cylinder iii, there being a perforated wall as between said cavity and the bore of the pump cylinder. The valve 'il includes a valve stem 8! that is provided with a valve head 82 which is movable toward and from a valve seat 83 located at the lower end of the valve body '58. The valve body E8 screwthreadedly receives a packing gland 24 which is adapted to act against a body of packing material 85 so as to prevent leakage of liquid or vapor around the valve stem BI, and said valve stem is embraced by a coil spring 86 which is interposed under compression between the outer face of the packing gland S6 and a. masher 8'! which abuts against a nut 38 that is mounted on the valve stem 85. The coil spring 86 urges the valve head 82 toward its related seat 83 for closing egress of liquid or vapor through the valve H, and the outer end of the valve stem 8i is engaged by an extension 39' of a bell crank lever 89 that is pivotally mounted, by means of a pivot element 90 on an arm 9| which is extended from the wall of the pump cylinder ID.

The valve body 2'8 of the valve i! is provided with an annular passageway Q3 into which passageways 94 lead from the interior of said valve body, said annular passageway being in communication with a passageway 95 which is formed in an extension 96 forming part of the wall of the pump cylinder. Arranged in communication with the passageway 95 is a conductor 97 which merges into a condensing coil 97', there being a check valve 98 at the discharge end of said con- 1ever 5| to the seat 53 of said lever.

5 densing coil 9"" which permits of the discharge of liquid from the condensing coil into the interior of the housing l but which bars reverse movement of liquid. The conductor 9: has asso' ciated therewith a packing gland 99 which is screwthreadedly received by the extension as of the pump cylinder wall and acts against a body of packing material Sill in a manner to prevent leakage of vapor or liquid around the end portion of the conductor which is disposed within said extension 96.

In the operation of the improved pump disclosed herein, the piston 14 is subjected to reciprocatcry motion in the conventional manner so that its forward portion reciprocates within the bore of the pump cylinder H1. On the rearward stroke of the piston the intake valve 3"! is maintained in its open position because the roller 55 of the link 58 is seated in the seat 53 of the lever 51, and therefore during such rearward movement of the piston i i liquid will pass through the intake valve 3? into the bore of the pump cylinder. As the piston approaches the limit of its rearward movement the arm 35 which moves with the piston, engages the collar 51 on the rod [i9 and moves said rod rearwardly so as to disengage the roller E5 of the link 55 from the seat 53 of the lever 5| and swing the outer portion of the link 56 rearwardl'y. As the link roller is disengaged from the seat 53 of the lever ill the coil spring 42 moves the valve head ll of the intake valve 3? to its closed position relative to the valve seat 5 5 and the roller of the link 55 is caused to be seated in the seat 5% of the lever 5i.

The compression stroke of the piston is now started and as the piston approaches the limit of its forwardmovement the forward end of the rod 33 engages the bell crank lever 89 and the exten sion 89 of said bell crank lever depresses the valve stem 85 of the valve l'l' and moves its valve head away from its related valve seat 83 to open the valve "El and permit any vapor which may be present within the bore of the pump cylinder to pass therefrom through the valve ll. Any vapor which passes through the valve H, as d..- scribed, moves through the conductor Eli and through the condensing coil 91, wherein said vapor is condensed, and such condensate is re- "turned to the interior of the housing l by way of the check valve 98. lso, during forward movementof the piston i l liquid is compressed within the bore of the pump cylinder and such compressed liquid forces the outlet valve '63 to its open position whereupon liquid is forced by the pump through the conductor 12 to its point of disposition. As the piston approaches the limit of its forward movement the arm 36 engages the collar 62 on the rod Bil whereby said rod fill is moved forwardly so as to swing the roller 55 of the link 5S from the seat 5 5 of the This will again adjust the inlet valve 3"! to its open position and the sequence of operations just described is repeated.

The structure illustrated by Fig. 2 differs from the structure of Fig. l in that the pump B of Fig.2 includes an auxiliary leading device Hi9. The-pump B of Fig. 2 includes a pump cylinder l-ill within which the forward portion of a piston N32 is disposed for reciprocatory movement. The auxiliary loading device includes a pair of ball valves its and HM which are forced against their valve seats 13' and H34 by coil springs Hi5 and I05, these ball valves being unseatedby suction during the suction stroke of the piston 1112 of theiipump to permit liquid to-pass by said ball valves into the boreof th'e'pump cylinder. The pump B of Fig. 2 is provided with an outlet valve ml, said outlet valve being constructed. in accordance with the outlet valve 53 of Fig. 1, and a conductor it being related to said outlet valve lllt which conducts liquid passing through said outlet valve to a point of disposition of said liquid.

The pump of Fig. 2 is provided with a vapor release valve its which is constructed in accordance with the vapor release valve 1? of Fig. 1. However, the vapor release valve Hill of Fig. 2 is operated mechanically by means which differ from the means for actuating the vapor release valve ll of Fig, 1. In other words, the means for actuating the vapor release valve 1% of Fig. 2 comprises a lever llll which .is provided with an extension l Iii that engages the outer end of the valve stem tilt-la of the vapor release valve 39. The lever Mil is tapered and the inclined face liila, thereof is provided with a curved seat II! and a seat l 52, and said lever is pivoted by a pivot element H3 to an arm H4 which is extended from the wall of the pump cylinder lili. The lever 5 ill has related thereto a link H5 which is pivoted at an end thereof by a pivot element lit to cars H? which are formed on the wall of the pump cylinder, and mounted on said link at its opposite end is a roller IIB. Additionally, the link i 55 has pivotally attached thereto a rod ii which extends through an opening EEG formed through an arm it! which is movable with the piston '22, said rod having fixedly mounted thereon a pair of spaced collars I22 and 23.

In the operation or" the pump illustrated in Fig. 2, the vapor release valve W9 is adjusted to its open position by the arm i2! engaging the collar 532 on the red I I9 and moving said rod forwardly so as to cause the roller H8 on the link H5 to be seated in the seat ll! of the lever Hi), this action taking place as the piston 22 approaches the limit of its forward, compression stroke. The vapor release valve Hi9 remains in its open po-- sition during substantially the entire suction stroke of the piston in order that any vapor which maybe present within the bore of the pump cylin der may be exhausted therefrom, such vapor be" ing conducted to a condensing coil (not shown) by a conductor 91a. When the piston approaches the limit of its rearward, suction stroke the arm i2l engages the collar I23 on the rod H9 thereby moving said rod rearwardly and swinging the roller H8 from the seat H! of the lever Mil to the seat i 52 of said lever and permitting the vapor release valve its to close, said vapor release valve remaining closed during substantially the en-- tire compression stroke of the piston and again being opened as said piston approaches the forward limit of its compression stroke. Thus, the difference between the structures of Figs. 1 and 2 is that in 1 the vapor release valve ll is opened momentarily as the piston approaches the limit of its forward, compression stroke, while the vapor release valve see of Fig. 2 remains open during substantially the entire suction stroke of the piston of the pump B.

The form of the invention illustrated in Fig. 3 is intended for use in situations Where such high pressure is produced within the cylinder of the pump that opening of the vapor relief valve (the valve 7'! of Fig. l or the valve I09 of Fig. 2) against the high pressure is rendered diihcult. In Fig. 3 the pump C is provided with a cylinder 124 within which the forward portion of a piston 125 .is arranged .for reciprocation therein. The

pump C is provided with an intake valve I26 and an outlet valve I21, said intake valve and said outlet valve of Fig. 3 being actuated in accordance with the operation of the intake valve 3'7 and the outlet valve 63 of the form of the invention shown in Fig. 1, as has heretofore been described herein.

The vapor relief valve of Fig. 3 is designated generally by the reference character H8 and it comprises a valve body I29 which is provided with an externally screwthreaded stern 536 which is received within an internally screwthreaded extension i3I that is formed on the wall of the cylinder I24. The outer portion of the valve body I28 is generally cylindrical, and a bridge portion 132 extends transversely of said cylindrical, outer portion of said valve body, said bridge portion having a cavity 133 formed therein, the wall of which is screwthreaded. The cavity 533 communicates with a passageway I34 which is formed partially through the bridge portion H2 and through the stem I30, this passageway I34 in turn communicating with a passageway 33% which is formed through a wall portion of the cylinder iZt. The cavity 133 formed in the bridge portion 532 receives a screwthrcaded stem of a nozale E35, said nozzle having a passageway i3? formed therethrough.

Arranged in embracing relation with respect to the bridge portion I32 is a yoke itt, said yoke being U-shaped and spaced legs thereof being disposed at opposite sides of said bridge portion. The yoke I35 is provided with a screwthreaded stem I39 which is received within a screwthreaded opening formed in a socket member M0, said socket member being arranged at the forward end of a rod MI which extends rearwardly of the pump C. The valve body I29 has screwthreadedly associated therewith at its rear end a fitting Hi2 which is provided with an opening through which the rod I ii extends, said. fitting having a packing gland M3 related thereto which serves to force a body of packing material i 8 against the circumferential face of the rod hit so as to prevent leakage of vapor or liquid around said rod. The rod Mil has fixed thereto, by means of a key it", a spring seat Hit, a coil spring under compression it"! being arranged with one of its ends in contact with said spring seat Hi6 and with its opposite end in contact with a portion of the fitting Hi2 so that said coil spring tends to move the rod H ll rearwardly.

Mounted between the spaced. legs of the yoke I33 is a closure element i 58 which is provided with a seat M9 that normally contacts with the forward end of the nozzle E35, and arranged forwardly of the yoke is a coil spring ibii which contacts at its opposite ends with a portion of said yoke and a portion of a fitting it i said coil spring its tending to move the yoke i538 rearwardly. The fitting I5! is screwed into the forward portion of the valve body I2 and said fitting is provided with a guideway I52 which receives a guide stern 5 :33 that is movable with the yoke I38. The valve body I29 is provided with a passageway I55 which communicates with a passageway #55, said passageway 55 being in communication at its forward end with a cavity ififi located within the valve body I38. Disposed in communication with the passageway we is a conductor Hi l which merges into a condensing coil i 58, said conductor at its discharge being provided with a check valve 159.

The piston I25 of the pump illustrated in Fig. 3 supports an arm I60 on which is mounted an abutment element IN and when, in the operation of the pump C, the piston approaches the limit of its forward movement, the forward end of the abutment element Iiii engages the rear end of the rod Mi and moves said rod forwardly. The yoke 53% moves forwardly with the rod MI so as to move the seat I49 of the closure element I 58 away from the forward end of the nozzle I36 and thereby permit any vapor which may be present within the bore of the cylinder to pass from the nozzle ltd into the cavity $56 of the vapor relief valve we and tomove through the passageways 55 and led to the conductor I51, such vapor passing through and being condensed in the coil I58 with the condensate being discharged through the check valve E59. Thus, even though rather high pressure be present within the bore of the pump cylinder use, such high pressure will in no manner interfere with the free actuation of the vapor relief valve I28.

We claim:

1. A displacement pump comprising a pump cylinder, a piston arranged for reciprocatory movement within said pump cylinder, inlet valve means for admitting liquid medium into the bore of said pump cylinder, outlet valve means for permitting discharge or" liquid medium from the bore of said pump cylinder, a vapor release valve movable to open position for releasing vapor from the bore of said pump cylinder, as said piston approaches the limit of its compression stroke and means for automatically actuating vapor release valve, the last-men tioned means including an outwardly extended element movable with said piston, a member related to said outwardly extended element and moved thereby, and an element for actuating said vapor release valve which is operated in response to movement of said member.

2. A displacement pump comprising a pump cylinder, a piston arranged for reciprocatory movement within said pump cylinder, inlet means for admitting liquid medium into the bore of said pump cylinder, outlet valve means for permitting discharge of liquid medium from the bore of said pump cylinder, a vapor release valve movable to open position for releasing vapor from the bore of said pump cylinder, as said piston approaches the limit of its compression stroke and means for automatically actuating said vapor release valve, the last-mentioned means including an outwardly extended element movable with said piston, a rod related to said outwardly extended element and moved thereby, and a lever for actuating said vapor release valve which is operated in response to movement of said rod.

3. A displacement pump comprising a pump cylinder, a piston arranged for reciprocatory movement Within said pump cylinder, inlet means for admitting liquid medium into the bore of said pump cylinder, outlet valve means for permitting discharge of liquid medium from the bore of said pump cylinder, a vapor release valve movable to open position for releasing vapor from the bore of said pump cylinder, as said piston approaches the limit of its compression stroke and means for automatically actuating said vapor release valve, the last-mentioned means including an outwardly extended element movable with said piston, a rod related to said. outwardly extended element and moved thereby, and a pivotally supported lever for actuating said vapor release valve which is operated in response to movement of said rod.

4. A displacement pump comprising a pump cylinder, a piston arranged for reciprocatory movement within said pump cylinder, inlet means for admitting liquid medium into the bore of said pump cylinder, outlet valve means for permitting discharge of liquid medium from the bore of said pump cylinder, a vapor release valve movable to open position for releasing vapor from the bore of said pump cylinder, as said piston approaches the limit of its compression stroke and means for automatically actuating said vapor release valve, the last-mentioned means including an outwardly extended element movable with said piston, a rod supported by said outwardly extended element, and a lever for actuating said vapor release valve which is engaged and operated by said rod.

5. A displacement pump comprising a pump cylinder, a piston arranged for reciprocatory movement within said pump cylinder, inlet means for admitting liquid medium intothe bore of said pump cylinder, outlet valve means for permitting discharge of liquid medium from the bore of said pump cylinder, a vapor release valve movable to open position for releasing vapor from the bore of said pump cylinder, as said piston approaches the limit of its compression stroke and means for automatically actuating said vapor release valve, the last-mentioned means including an outwardly extended element movable with said piston, a rod movably supported by said outwardly extended element, and a pivotally supported lever for actuating said vapor release valve which is engaged and operated by said rod.

6. A displacement pump comprising a pump cylinder, a piston arranged for reciprocatory movement within said pump cylinder, inlet means for admitting liquid medium into the bore of said pump cylinder, an outlet valve for permitting dis- 10 charge of liquid medium from the bore of said pump cylinder, a vapor release valve movable to open position for releasing vapor from the bore of said pump cylinder, as said piston approaches the limit of its compression stroke and means for actuating one of said valves, the last-mentioned means comprising an element movable with said piston, a rod having ab utments mounted thereon which are engaged by said element for moving said rod in one or the opposite direction, a pivotally supported link pivotally connected to said rod, a lever for actuating said one of said valves which is subjected to movement by movement of said link, a rotatable element mounted on said link, and a pair of spaced seats formed in said lever one or the other of which receives said rotatable elements at different stages of the operation of the means for actuating said one of said valves.

ARTHUR J. FAUSEK. IRWING F. FAUSEK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,981,507 Harris et al Nov. 20, 1934 2,054,710 Okada Sept. 15, 1936 2,439,958 Anderson Apr. 20, 1948 2,442,361 Hulman June 1, 1948 2,447,741 DeBaufre Aug. 24, 1948 2,548,821 Anderson et a1. Jan. 11, 1949 2,469,362 Bashark May 10, 1949 2,481,183 Welby Sept. 6, 1949

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