US1632436A - Reciprocating pump - Google Patents

Description

June 14 1927. 1,632,436

L. DINESEN RECIPROCATING PUMP Filed Nov. 27, 1925 2 Sheets-Sheet 1 l 0 w I 0 fire/1 for 1,632,436 June 14 1927- DINESEN RECIPROCATING PUMP Filed Nov. 27. 1925 2 Sheets-Sheet 2 jig J 3 his 1479597208): MAM ff (7 1x.

Patented June 14, 1927.

r can LAURIE-8 DINESEN, OF MINNEAPOLIS, MINNESOTA.

morraooa'rme rumr.

' Application filed November 27, 1925. Serial No. 71,680.

The present invention relates to opposed reciprocating pumps and is directed to the improvement of pumps of this type and primarily to pumps of said type designed for use as vacuum pumps. The ob'ects of the invention, generally stated, are silnplicit of construction, efiicienc in action, ease o assembling for use an disassembling for repairs or for cleaning, silence in action andv ended piston on the line 4-4 of Fig. 5;

Fig. 5- is a vertical section taken on the line 5-5 of Fig. 2, some parts being shown in full;

Fig. 6 is a transverse vertical section on the line 6-6 of Fig. 5; and

Figs. 7 8, 9 and 10 are detail views in elevation showingthe elements of an exhaust mufiler that is applied at the exhaust port from the pump casing.

The body of the pump is in the form of a casing 11 shown as of approximately rectangular form and provided at one side with a removable head late 12 detachably secured thereto 'by mac ine screws 13 or the like. This casing is formed with diametricall aligned opposed cylinders 14 and at one si e it is formed with a bearin sleeve 15 that is axially aligned with a earing sleeve 16 formed on the head plate 12. The A common axis of the bearing sleeves15 extends at' a ri ht angle to the common axis of the cylinders 14, and said two axes lie in the same horizontal plane. In its upper portion, the casing 11 is formed with an air intake duct 17 that leads from a centrally located air intake port 18 and extends therefrom in opposite directions to the opposite ends of the cylinders 14. The port 18 will be connected to a vacuum tank or other place from which air is to be drawn to produce suction or partial vacuum.

The cylinders '14 are provided with detachable cylinder heads 19 detachably 'secured thereto b machine screws 20 or the like. These cylinder heads 19 are made tuhular or hollow by air-intake ports 21, their outer ends being tightly closed. by headplates 22 shown as detachably secured thereto by machine screws 23. Said cylinder heads 19 are formed with air intake ducts 2% that connect' thecorresponding ends of the main air intake duct 17 with the interiors of the respective cylinder heads. Seated in and normally closing the inner extremities of the ports 21 are check valves 25, the stems of which are slidably mounted in the hubs of spider brackets 26 formed within the cylinder heads. Nuts 27 on the stems of the check valves limit the opening movements of said valves.

At its closed side and near the top thereof, the casing 11 is provided with an exhaust muflier and, as shown, with a plurality of exhaust ports 28. The exhaust mufller illustrated comprises two discs 29 and 30 having, respectively, exhaust ports 31 and 32 and a cup-shaped cap 33 having exhaust ports 34. By amachine screw 35, the cap 33 is caused to clamp the rims of the discs 29 and 30 tightly against the adjacent side of the casing. The disc 29 is set with its ports 31 out of registration with the ports 28, and the disc 30 is set with its ports out of registration with the ports 31. Both of said discs 29 and 30 are of flexible material, such as vulcanized paper or the like, so that air exhausted from the casing will be resisted slightly .by the said perforated discs and the sound-muflling action is produced. 1

By reference to Fig. 6, it will be noted that the exhaust port from the casing just described is located above the exhaust ports in the pistons, so that the air will be discharged on a line extending through the uppermost. portion of the casing and as far as possible away from the body of oil.

The casing is adapted to contain oil, as indicated at y, and this oil is adapted to be introduced through a funnel-shaped tube 36 shown as projected from one side of the casing .and provided with a normally applied closing plug 37. Y

Working within the cylinders 14 are hollow pistons 37 that are rigidly connected by a web or connecting portion 38 that is offset or at one side of the common axis of the said pistons, thereby leaving the pistonconnecting member open at one side. At their opposing ends, the pistons are formed .with parallel vertically extended and longitudinally opposed fiat bearing surfaces 39 that are closely engaged by the flat vertical through the sleeve 16 and bushing 44, there is provided on the shaft 42 a joint ring comprising a washer 45 and a pliable ring 45*. At one side, to wit: at the side adjacent to the open side of the piston connection, the eccentric 41 -is provided with a peripheral flange 46 that bears against the outer or adjacent side of the crosshead 40. A coiled spring 47 is placed on the shaft 42 between the washer 45 and the eccentric 41. and exerts a force that keeps the washer 45 pressed against its seat and also causes the flange 46 of the eccentric 41 to press against the crosshead 40 and hold said crosshead seated at one side against bearing surfaces 48 formed on the piston connection 39. As shown, a washer 49 is interposed between the spring'47 and the eccentric 41.

The shaft 42 may be driven in any suitable way, but, as shown, it is provided at its outer end with a pulley 50 over which a power-driven belt, not shown, will be run to drive the pump.

Rigidly but detachably secured to the outer ends of the pistons 37, by machine screws 51 or the like, are piston heads 52 that are formed with air intake ports 53 and with large valve seats 54. Tubular valve-guiding stems 55 are rigidly secured to the hubs of the piston heads 52 and'project axially inward therefrom, and on these stems are slidably mounted inwardlyv opening check valves 56 formed with hubs that v are closed at their inner ends. These check valves 56 are normally closed by coiled springs 57 that are seated against the hubs of open. or spider webs 58 formed within the respective pistons. The tubular stems 55prevent air from being caged within the closed hubs of the check valves 56 and,

as shown, these closed hubs are arranged to applied to 11 through large airports 60, which, for

an important purpose presently to be noted,

are locatedin the tops of said pistons and as far as possible away from the body of oil 3 contained within the casing.

As a means for splashing oil onto the cocentric 41 and crosshead 40, the latter is shown as formed with a depending splashing arm or blade 61, the lower end of which projects downwardly slightly into the oil g.

It will be noted that the openin in the casing that is normally closed by the head plate 12 is of such size that when said head is removed, the eccentric and crosshead may be freely moved laterally outward through said opening, thus permitting the said head 12, shaft 42, eccentric and crosshead to be removed from the casing without disas sembling the said parts just noted.

When the pump is in action, the diametrically opposed pistons will, of course, be simultaneously reciprocated and alternately given air-compressing actions, so that the compression of air will be substantially continuous. When a piston moves from the outer end toward the inner end of its cylinder, its check valve 56 will remain closed and the check valve 25 in the outer end of said cylinder will freely open, thus causing air to be drawn into the outer end of that cylinder. Of course, the air thus drawn into the cylinder will be drawn from the vacuum'tank or other place where vacuum or suction is to be produced. When the said piston is given its reverse or outward movement, the check valve25 just noted will be closed and the check valve 56 will open, permitting the caged air to be forced into the interior chamber of said piston and from thence through the port 60 into the upper portion of the casing, and from thence outward through the exhaust mufiler described. Here it is important to note that theair discharged from the pistons will be directed upwardly into the upper portion of the casing and away from the body of oil and in a direction away froin the splashed oil, so that the tendency that would otherwise be produced to carry some of the oil with the exhausted air is eliminated or reduced to nil.

In previous practice, with air ports located at the bottoms of the cylinders, much trouble has been experienced by thefact that considerable oil would be carried away with the exhausted air.

The statements above made are based on experience with actual workingpumps.- The drawings illustrate a commercial form of the pump, but it will be understood that trated as an air compressor. Also, it should be understood that while the pump is priby slight modification or in the form illusneeaeee marily designed and has been particularly described as an'air pump, it is capable of pumping any kind of liquid.

'hat I claim is:

1. In a pump of the kind described, the combination with a casing adapted to contain oil and having a laterally extended cylinder, of a hollow piston workin within said cylinder, inwardly openin chedl: valves in the outer end of said cylinder and in the outer end of said piston, and means for reciprocating said piston and for splashing oil within said casing, said casing having an air-discharge port and said p1ston.having an air-discharge port opening from the upper portion thereof and arranged to discharge air into the upper portion of said casing and away from the oil therein contained.

2. The structure defined in claim 1 in which the air-discharge port in said casing is. at the upper portion thereof.

3. In a pump of the kind described, the combination wlth a casing adapted to contain oii and having axially spaced and aligned cylinders, of opposed hollow pistons working in said cylinders, check-valve equipped air intake ports in the outer ends of said cylinders, check-valve-equipped air intake ports in the outer ends of said hollow pistons, and ineans for reciprocating said pistons and for splashing the oil within said casing, said casing having an air discharge port and said pistons in their upper sides having air-discharge ports arranged to di rect air into the upper portion of said casing and away from the oil therein contained.

4. The structure defined in claim 3 in which the air-discharge port from said casing is at the upper portion thereof and above the air-discharge port in said piston.

5. In a pump of the kind described, the combination with a casing adapted to contain oil and having horizontally opposed cylinders, of rigidly connected hollow pistons workin in said cylinders, inwardly openlng cheer-valves applied in the outerends of said cylinders and pistons, a. cross head en aging between said pistons and mounted for vertical movements, an eccentric on which said crosshead is mounted, said crosshead having a de ending s lashing arm, and a shaft'journailed to. sai casin and to which said eccentric is secured, said pistons having air ports in their upper inner end portions and said casinghavmgan exhaust port in its up er portion. V 6. A pump of the ind described comprising a casing having opposed axially ali ed cylinders with inwardly opening c eck valves in their outer ends,-pistons working in saidcylinders and having inwardly open-- ing' check valves, a web rigidly connecting said pistons and located at one side of the axis thereof, leaving the connection open and a coiled spring at its other side, a crosshead seated against said web and engaging opposing inner end surfaces of said pistons, an eccentric journaled in said crosshead having a peripheral flange enga ing that side of the crosshead that is at the open side of thepiston connection, a removable head applied to said casing at that side that is adjacent the flange on said eccentric, a shaft .journaled in said head plate and in the opposite side of said casing and to which said eccentric is secured, and a spring applied around said shaft and compressed between said head plate and eccentric and operating substantially as de-,

scribed.

7. In a pump of the kind described, the combination with a casing having opposed axially aligned cylinders with inwardly opening check valves in their outer ends, said casing having an air-discharge port leading to the atmosphere, of pistons working in said cylinders and having inwardly opening check valves, a web rigidly con necting said pistons and working at one side of theaxis thereof, leaving the connection open at its other side, a crosshead seated against the web and engaging the opposing inner surfaces of said pistons, an eccentric journaled in said crosshead and having a peripheral flange engaging that side of the crosshead that is at the open side of the a piston connection, a, removable head applied to the casing at that side that is adjacent to the-flange of said eccentric, a shaft journaled in said head plate and in the opposite side of said casing and to which said eccentric is secured for rotation therewith, and means interposed between said eccentric and removable head plate for holding said eccentric against lateral dis laceinent and causing the latter to hold sai crosshead against lateral displacement.

8. A pump of the kind described comprising a casing having opposed axially aligned cylinders with inwardly opening check valves in their outer ends, pistons working in said cylinders and having inwardly opening check valves, 9. web rigidly connecting said pistons and located at one side of the axis thereof, leaving the connection open at its other side, a crosshead seated against said web and engaging opposing inner end surto said casing at that side that is a acent the flange on said eccentric(i a shaft journaled in said head plate an in the opposite side of said casing and to which said eccentric is secured, a joint rin applied around said shaft and enga ed wit said head plate to form a tight joint, applied around said shaft between said oint ring and eccentric lac andholding said two elements against lateral displacement and in working position.

9. The structure defined in claim in further combination with a bushing applied in the fixed wall of said casing in direct engagementwith the inner end ofsaid shat't, said bushing having a closed outer end.-

10. A ptunp comprising a casing having axially aligned opposed cylinders and provided with a main air duct formed directly therein and terminating substantially flush with the ends of said cylinders, cylinder heads detachably secured to the outer ends of said cylinders and equipped with check valves, said cylinder heads having formed directly therein air-intake conduits that lead 1 from the outer ends of said main air duct to the said inwardly opening check valves, connected hollow pistons working in said cylinders and provided with check valves and with air ports, and means for reciprocating said pistons.

11. In a pump, the combination with a casing adapted to contain oil and having a laterally extended cylind r. oi a hollow piston working within said cylinder. check valves controlling the flow of air through said cylinder and piston. and means for reciprocating said piston and for splashing oil within said casing, saidcylinder and easing having air ports located above the level of the oil within said casing, the air port in said piston being in the upper portion thereof, whereby the air, in moving from the one port to the other, passes high above the oil level.

12. In a pump, the combination with a casing adaptedrto contain oil and having opposed axially aligned substantially horizdhtal' cylinders, of rigidly connected opposed hollow pistons working in said cylin-- ders, check valves controlling the flow of air through said cvlinder and pistons, and means for reciprocating said pistons and for splashing oil within said casing, said cylindor and easing having air ports located above the level of 'the oil within said casing, the air ports in said pistons being in the upper portions thereof, whereby the air in IDOVIDO from the one port to the other passes big 1 above the oil level.

A pump of the kind described compr s ng a casing having opposed axially aligned cylinders, pistons working in said cylinders, a web rigidly connecting said pistons and located at one side of the axis thereof, leaving the connection open at its other side, a crosshead seated against said web and engaging the opposite inner end surfaces of said piston, an eccentric journaled in said crosshead and having a peripheral flange engaging that side of the crosshead that is at the open side of said piston connection, a removable head applied to said casing at that side that is adjacent to the flange on said eccentric, a shaft journaled in said head plate and in the opposite side of said casing and to which said eccentric is secured, a spring applied around said shaft and compressed between said head plate and eccentric and yieldingly holding said eccentric and croshcad against lateral 'displacement. and check valve controlling the flow o'lnir through said cylinders and pistons.

In testimony whereof I afiix my signature.

naunrrs DINESEYN.

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