US2394371A - Pump - Google Patents

Description

W. L. DAVIS Feb. 5, 1946.

PUMP

2 Sheets-Sheet 1 Filed March 2l, 1945 als , INVENTOR. FRANCES L.DAV|S Y Executrx oHhe esae of wg. z

`WALWIN L.DAVIS,deceased.

BY m ATTORNEYS Patented Feb. 5, 1946 PUMP Walwin Davis, deceased, late of Avon, Ohio, by

Frances L. Davis, executrix, Avon, Ohio, assignor ,to E. D. McCurdy, trustee, Cleveland,

Ohio

Application March 21, 1945, Serial No. 583,982

(Cl. 10S-44) S Claims.

This invention relates as indicated to pumps and more especially to pumps adapted to handle uid materials which for any reason may not be desirably or safely brought into contact with closely tting operating parts of the pump mechalllsm. n

It is a principal object of this invention to provide a pump of the character described which may be regulated so as to provide variable discharge per unit of time even when the speed of operation of the pump is maintained constant.

Other and more particular objects of the invention will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims. The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings: l

Fig. 1 is a vertical section view through a pump constructed in accordance with the principles of the invention;

Fig. 2 is a plan view of the assemblyv illustrated in Fig. l, it being noted that Fig. 1 is taken on a plane substantially indicated by the line I-I on Fig. 2;

Fig. 3 is a section view of the apparatus illustrated in Fig. 1 taken on a plane substantially indicated by the line 3 3;

Fig. 4 is a transverse sectional View of the apparatus illustrated in Fig. 3 taken on a plane substantially indicated by the line 4--4;

Fig. 5 is a broken side elevational View of the upper left-hand portion of the apparatus illus-v trated in Fig. 1;

Fig. 6 is a transverse sectional view of the apparatus illustrated in Fig. 1 taken on a plane substantially indicated by the line 6 6; and

Fig. 7 is an enlarged sectional view drawn to double scale of the apparatus illustrated in Fig. 3 taken on a plane substantially indicated by the line I-'I.

Referring now more specifically to the drawings and more especially to Fig. 1, the pump here illustrated as one embodiment of the invention comprises a body generally indicated at I which is provided with a cavity therein, which cavity is divided into two non-communicating compartments 2 and`3 respectively. Compartment 2 is defined by a bellows, generally indicated atll', attached to a flange 5 in which is formed a passage 6 leading to branch pas-sages l and B which are respectively in communication with inlet and outlet orifices 9 and I0 respectively..

In the branch passage I is a check Valve member II urged by the spring l2 into engagement with the remote end 0f the branch passage 'I. In the branch passage 8 there is a check valve member I3 which is urged into engagement with the near end of the branch passage 8 by means of a spring I4.

It will be observed that as a vacuum is created in the compartment 2, the check valve II will be unseated and the check valve I3 will be seated, thus drawing fluid from the inlet orice 9 into the compartment 2. When pressure is built up in the compartment 2, then the check valve I I will be seated and the check valve I3 Will be unseated causing the fluid in the compartment 2 to now into and through the outlet passage Ill. A

Compartment 3 in the pump body is divided by means of the partition I into a pressure compartment 31a and a relief compartment 3b. the Vpartition I5 there is an opening which receives in close fitting telescopic engagement a sleeve I6, the latter being carried by the lower end of a yoke I1. The upper end I8 of the yoke I1 is adapted to receive in close fitting engagement a cam member I9 carried by a shaft 20 on the end of which is an adjusting lever 2 I. It will be observed that as the lever 2l is rotated effecting a rotation of the shaft and its attached cam member I9, the yoke I'I will be raised and lowered causing the sleeve IB .to be raised and lowered in the opening in the partition I5.

J ournalled in the body of the pump is a crankshaft 22 which, at one end, carries a gear` 23 which is in mesh with a driving pinion 2li carried by a shaft 25 to which is connected the motor 28 by means of the driving coupling 2'I. Mounted on the oli-Set or crank portion 28 of the crankshaft 22 is a piston rod 29 which at its lower end carries a piston 30. The lower end 3l of the piston 30 is cut away in the form of intervening utes and lands as most clearly illustrated in Fig. 7, so that the lands, being in engagement with the inside of the sleeve I6, serve as a means for guiding the lower end of the piston 30 for reciprocation in the sleeve I6.

The upper portion of the piston S is cylindrical as at 32 and of such diameter as to have close fitting telescopic engagement with the inside of the sleeve I6.

The operation of the above described Dump is briefly as follows:

The compartments 3a and 3b. will be lled with a iiuid preferably an incompressible fluid and one which has lubricating properties such as a highgrade rened mineral oil. The inlet port 9 will be connected to the source of fluid to be pumped and the port lil will be connected to the out-fall or pressure conduit. When the motor 26 is startedthis will cause a reciprocation of the piston 30. As the piston descends, the lower end 3l thereof will displace fluid in compartment 3a and such fluid will ilow upwardly past the piston, i. e. through the flutes therein into the compartment 3b. When, however, the piston descends to the point where the uninterrupted cylindrical portion 32 thereof moves into engagement with the upper end of the sleeve I6, then further downward movement of the piston 3Q must result in a displacement of the fluid in compartment 3a in some other direction, i. e. the eiiective volume of compartment 3a is thus reduced.

This will result in a building up of pressure in compartment 3c causing the bellows 4 to be col.- lapsed forcing the contents thereof outwardly through the discharge conduit l0. When the piston has reached the limit of its downward stroke and then begins moving upwardly, this will cause not only a relief of thapressure in the compartment 3a, but also a vacuum therein causing the bellows 4 to be: distended, whereupon the check valve I3 will close and the check valve l2 will open, filling compartment 2, i. e. the interior of the bellows, with a fresh supply of fluid which will be pumped out intov the. discharge. conduit lil the next time the piston descends..

It will be observed that by adjusting theI sleeve i6 axially in the partition lilY it is possible to. vary the effective stroke length of the piston, i. e. as the sleeve l is raised from its lowermost position, as illustrated in Fig. 1, the cylindrical portion 32 oi the piston will seal oi thev passage through the sleeve IB at anI earlier point in the downward movement of the piston causing. a greater volumetric displacement in compartment 3d for each stroke of the piston and correspondingly increasing the output ot the pump even though the speed of rotation of the crankshaft E8 is maintained constant.

Instead of employing a bellows of the. character illustrated in Fig. 1, any other" deformable diaphragm may be employed to separate. compartments 2 and 3. For example, a flat sheet of deformable material might be stretched across the mouth of passage 6 in a furthermodiiication of the construction illustrated inthe drawings.

The pump described above has: all of theY moving parts which are subject to wear operating. in a bath of lubricating oil and `without. any possibility of contaminati-on from the material being handled which is sealed ofi bymeans of the diaphragvm orbellows. This makes possible a construction capable of handling materials which would be corrosive or otherwise detrimental to the operating parts of the pump. A pumpof this design is also admirably suited for use in pumping food products such as milk becausethe parts, with which the material being handled by the pump comes inV contact, may be readily cleaned and sterilized.

The adjustment of the output oi the pump is readily controlled by means of the handle 2i and, as illustrated in Fig. 5', ordinals suc-h as those indicated at 35- may be placedon the pump casing adjacent the handle 2l as an indication of the setting of the pump.

Other modes of applying the principle off the invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

It is therefore particularly pointed out and dis- -tinctly claimed as the invention:

1. A iiuid pump having a bodyprovided with a cavity therein, a partition including a flexible diaphragm dividing said cavity into first and second compartments, said body provided with inlet and outlet ports leading to said iirst compartment, a fluid in said second cavity, means for setting up pulsations in said fluid, including a plunger having valving uid passway means and a cooperating port-providing sleeve, means for axially adjusting the sleeve, and plungeroperating means between the latter means and the plunger.

2. A fluid pump having a body provided with a cavity therein, a partition including a flexible diaphragm dividing said cavity into rst and second luon-communicatingcompartments, said body provided with inlet and outlet. ports leading to said first compartment, a fluid in said second cavity, plunger means for setting up pulsations vin said fluid, means including a sleeve cooperating with the plunger means for adjustably varying the magnitude of such pulsations, and operating means for the plunger means between the latter means and the plunger means.

3. A fluid pump having a body provided with a. cavity therein, ay partition includingV a'flexible diaphragm dividingr said cavity into iirstand second non-communicating compartments, said body provided with inlet and. outlet ports leading to said first compartment, a ported partition dividing said compartment intopressure and relief `cormiartrnents,V a fluid in said second compartment, and means for eiiecting a reciprocating flow of such iii-iidr between, said pressure and relief compartments whereby said diaphragm is ilexed, including a plunger having valving fluid passway means and a cooperating port-providing sleeve, means for axially adjustingthe sleeve, and plunger-operating meansv between the latter means and the plunger.

4. A iluid; pump having a bod-y provided with a cavity therein', a partition including a. flexible diaphragm dividing said cavity intoI first and seoond non-communicating compartments, said body provided with inlet andy outlet. ports leadingto said first compartment,j a fluid filling. said second compartment, and means 4tor periodically increasing and decreasing the. eiiective size of said second compartment, including a. plunger having valving fluid passw-ay means and. a cooperating port-providi-ng sleeve, 'means for axially adjusting the sleeve, andplunger-operating means between the -latter` means andthe. plunger.

5. A iluid. pump having a body provided with ay cavity therein, a partition including a ilexible diaphragmkdividing said cavity into rst and second; non-communicating. compartments, said bodyl provided withrinlet and outlet. portsleading to said rsticompartment, a. second partition dividing said compartment into pressure and. relief` compartmenta an opening through sai-d last named. partition, anda plunger uted inpart. of its; length and reciprocablev inr saidopening..

6'. A fluid' pump havingA a` body provided with a: cavity therein, a partition including. a. flexible diaphragm dividing said.; cavity into. first and sec.- ond non-communicating; compartments, saidbody proizided with inlet. and outletv ports: leading. ta said first compartment a. second partition dividing said compartment into pressure and relief compartments, an opening through said last named partition, a port-providing sleeve in said last named opening, means for adjusting the axial position of said sleeve, a plunger in said sleeve axially channeled along part of its length, and means for reciprocating said plunger in said sleeve with strokes of equal throw.

7. A ilud pump having a body provided with a cavity therein, a partition including a flexible diaphragm dividing said cavity into first and second non-communicating compartments, said body provided with inlet and outlet ports leading to said rst compartment, a second partition dividing said compartment into pressure and relief compartments, an opening through said last named partition, a port-providing sleeve'in said lastnamed opening, means for adjusting the axial position of said sleeve, a plunger in said sleeve having an axially channeled reduced forward guiding portion followed by a portion in close fitting telescopic engagement with Asaid sleeve,

and means for reciprocating said plunger in said sleeve with strokes of equal throw.

8. A fluid pump having a body provided with a cavity therein, a partition including a flexible diaphragm-dividing said cavity into iirst and second non-communicating compartments, .said body provided with inlet and outlet ports leading to said rst cavity, check valves in said ports, a second partition dividing said compartment into pressure and relief compartments, an opening through said last named partition, a portproviding sleeve in said last named opening, means for adjusting the axial position of said sleeve, a plunger in said sleeve having an axially channeled reduced forward guiding portion followed by a portion in close tting telescopic engagement with said sleeve, and means for reciprocating said plunger in said sleeve with strokes of equal throw.

FRANCES L. DAVIS,

Executria: of the Estate of Walwin L. Davis, de-

ceased.

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