US2812720A

US2812720A - Reciprocating pump

Info

Publication number: US2812720A
Application number: US311390A
Authority: US
Inventors: Kenneth A Ellis
Original assignee: BAKER Manufacturing CO
Current assignee: Baker Manufacturing Co LLC
Priority date: 1952-09-25
Filing date: 1952-09-25
Publication date: 1957-11-12
Anticipated expiration: 1974-11-12

Description

2 Sheets-Sheet 1 Filed Sept. 25, 1952 2 Sheets-Sheet 2 K. A. ELLIS RECIPROCATING PUMP- Nov. 12, 1957 Filed Sept. 25, 1952:-

RECIPROCATIN G PUMP Kenneth A. Ellis, Evansville, Wis., assignor to Baker Manufacturing Company, Evansville, Wis., a corporanon of Wisconsin Application September 25, 1952, Serial No. 311,390 2 Claims. (Cl.103-175) This invention relates to a reciprocating pump of the type in which the fluid is drawn into a suction chamber through the inlet pipe and then into the cylinder of the piston on one stroke of the, latter and, on the return stroke, is forced into a discharge chamber and out through an outlet pipe.

The general object is to provide a pump of the above character with a new and improved casing which permits quick and easy access to the pump parts without disconnecting the inlet and outlet pipes.

Another object is to form the casing in a plurality of readily separable sections with the suction and discharge chambers formed in one section to which the inlet and outlet pipes are connected so that this section and the pipe connections need not be disturbed in making normal repairs on the pump.

, A more detailed object is to form the casing in three sections, one defining the suction and discharge chambers, one housing the piston and one enclosing the reciprocating mechanism, to permit the pump to be dis mantled easily.

Still another object is to mount the motor for driving the pump in a novel manner on the stationary casing section so that neither the motor nor the electrical connections therefor need be disturbed preparatory to repairing the pump.

A further object is to mount the intake and discharge valves of the pump in a novel and advantageous location between two of the detachable casing parts.

The invention also resides in the novel arrangement oflthe parts to provide a two pedestal support for the pump.

Other objects and advantages of the invention will become apparent from the following detailed description taken in connection with the accompanying drawings, in which? Figure 1 is a perspective view of a pump with a casing embodying the novel features of the present invention.

Fig. 2 is an exploded view of the casing.

Fig. 3 is a fragmentary sectional view taken along the line 3-3 in Fig. 2.

Figs. 4 and 5 are fragmentary sectional views taken along the line 4-4 and 55 in Fig. 3.

For the purpose of illustration, the invention is shown in the drawings embodied in a reciprocating pump driven by an electric motor 11 mounted on a pump casing 12 and connected by a belt 13 to a flywheel 14 which reciprocates a piston 1t} through the medium of a reciprocatingmechanism 15 disposed within the casing. This mechanism comprises a crank 16 fast on the shaft 17 of the flywheel and a pitm-an or connecting rod 18 pivoted atone end to thecrank and at the other end to a crosshead 19 which, in turn, is connected to the outer end of the piston rod 20.

In the present instance, the pump is double-acting and, for this purpose, the piston slides in a cylinder 21 which opensat opposite ends into separate closed champort27 while the piston piston chambers 22 and 23.

2,812,720 Patented 0v. 12, p

bers 22 and 23 (Fig. 3). The piston chamber 22 communicates with a suction chamber 24 (Fig. 4) through a port 25 and with a discharge chamber 26 through a chamber 23 similarly is connected to the suction and discharge chambers through ports 28 and 29 respectively (Fig. 5). The ports 27 and 29 are closed in a conventional manner by check valves 30 seated on the discharge side of the ports and the

ports

25 and 28 are closed by check valves 31 on the piston side. Thus, when the piston 10 moves to the right as viewed in Fig. 3, fluid such as water entering the suction chamber 24 through an inlet pipe 32 is drawn into the chamber 23 through the port 28. At the same time, water in the chamber 22 is forced through the port 27 and into the discharge chamber 26 from which it may be delivered to a tank 33 through an outlet pipe 34. In a similar manner, water is drawn into the chamber22 and forced out of the chamber 23 on the return stroke of the piston.

In accordance with the present invention, the c*asing.12 is constructed ina novel manner to permit the suction and

discharge chambers

24 and 26 to be formed in a separate section .35 to which the inlet and

outlet pipes

32 and 34 are connected so that this section may be stationary. and need not be moved when it is desired to gain access to the pump parts normally requiring repair such, for example, as the valves 30 and 31, the piston 10, the crank and piston rod joints. In this way, the connections of the pipes may be comparatively permanent and normally it is unnecessary to disconnect the pipes in order to repair the pump. Preferably, the remaining portion of the casing is divided into two

sections

36 and 37, readily separable from each other and from the first section, the second section housing the piston 10 while the third encloses the reciprocating mechanism 15. Herein the casing section 35 is an elongated upright hollow casting of generally rectangular cross section and is divided by a horizontal partition 38 (Figs. 4 and 5) into upper and lower chambers which form the discharge and

suction chambers

26 and 24 respectively. As shown in Figs. 3 and 5, the inlet pipe 32 is threaded into a side wall 39 of the casing adjacent the lower end thereof and the outlet pipe 34 is threaded into the rear wall 40 of the casing adjacent the upper end so that each communicates with its respective chamber. On its front wall 41, the casing section 35 is machined to form a flat generally square vertical surface 42 extending above and below the partition 38. Four spaced ports 43 (Fig. 2) two communicating with each of the

chambers

24 and 26 extend through and are disposed in the four quadrants of the surface 42 so as to be alinecl with the four valve-controlled

ports

25, 27, 28, and 29.

Depending from the partition 38 and extending across the casing section 35 between the front and

rear walls

40 and 41 is a wall 44 (Fig. 4) by which any air coming into the suction chamber 24 is confined in the rear of the casing section 35 so that it cannot be drawn into the In one corner of the casing section 35 is a vertical passage 45 (Fig. 3) extending fromthe top of the casing down through the partition 38 and closed at its upper end by a threaded cap 46 so that the suction chamber may be filled with water to prime the pump.

To prevent the pressure in the discharge chamber 26 from becoming too great, a relief valve 47 closes a port 48 in the wall 49 between the passage 45 and the discharge chamber. Herein the relief valve comprises a disk 59 coacting with a seat 51 pressed into the wall 49. A tubular projection 52 on the back of the valve into the rear wall 40 of the casing section 35 and a calibrated compression spring 55 acting between the screw 54' and the disk 50 urges the latter against the seat'51. Thus, under normal operating conditions, the port 48 is closed .bythe valve 47 but, when the pressure in the discharge chamber exceeds .a desired value, thesvalve opens against the spring 55. and permits the water in the -discharge chamber tolbe returnedato the suction chamber 24.

"The second section 36 is cast to form a housing for thepiston .and is. divided into the piston chambers 22 and 23 by'an internal vertical .wall 56 (Fig. 3) having a tubular central portion 57. A brasssleeveispressed through the portion '5'7 to form the cylinder 21 of the pump. A verticalside wall 58 of the casting parallel to the cylinder '21 is machined to provide a flatexternal surfacei59i opposing the surface 42 on the casting 35. Four ports 60, two communicating with each of the piston chambers, extend through'the surface 59 and arespaced apart to be alined withthe

valved ports

25,27, 28 and 129 and the ports 43 through the surface 42 onthe casing section 35.

' In'the present instance, the

valved ports

25, 27 28 and ,29 are formed in the fourquadr-ants of a separate plate 61whichis-disposed betweenthe opposing surfaces 42 and59 on the casing sections 35 and-36 and supports the valves 30. Proper alinement of the ports in the plate with the ports in the casing sections is insured by dowel pins 62 (Fig' 2) projecting laterallyfrom the surface'42 and 'through holes in the plate. When the latter is in place against the surface 42, the two

casing sections

35 and 36 are fastened together by two bolts'63 projecting through the casing section 35 and holes in the valve plate 61 and threaded into the casing section 36. By tightening the bolts, the two sections are'drawn together clamping the plate between the surfaces'42 and 59. Suitable gaskets 64 on opposite sides of the plate may be provided to obtain a watertight connection.

To house the reciprocating mechanism 15, the 'third hollow casing section'37 is anlelongate'd horizontal casting alined with the casing section 36. The opposing ends of

thesections

36 and 37 are machined to form'

fiat mating surfaces

65 and 66 which .abut against each otherand the two sections areclamped together bytwo bolts 67 projecting lengthwisethrough the section36 and threaded into the section 37. As shown in Fig. 3, the piston rod is disposed within the section .37 and projects through a hole 68 in the surface-65 and into the cylinder 21 in the section 36. To seal the-piston chamber 23, a cylindrical seal 69 is pressed into the hole 68 and closes the latter around the piston rod. The back of'the casing section 37 is closed by a casting 70 (Fig. 2) bolted in place and having a lateral extension 71 in which the crankshaft 17 is journaled. A rectanguilar opening 72 (Fig. 2) in the front of the casing section 37' permits access to the reciprocating mechanism 15 and is closed by a removable cover plate 73.

Depending from the outer end of the casing section '37 and cast integrally therewith is a leg 74 from-the lower end of which projects a slotted lug 75. Similar slotted lugs 76 project outwardly from the lower end of "the'front and rear walls 41 and 40'of'the casing section so that the pump may be secured to a' suitable stationa'ryframe'or support (not shown) by bolts 77 (Fig. 1) projectingthrough the slots in the lugs. Thus the leg 74 an'dthe casingsection 35 form a two pedestal support for the pump.

Preferably, advantage is taken of the stationary'mount- 'ingof'the casing section 35 to support the motor 11 so' that'the electrical connections to the latter need not be disturbed as an incident to dismantling the pump preparatory tomaking normal repairs. To this end, a plate 78 is pivoted on a lug 79 on the side of the section 35" adjacent the upper end thereof and one 'side of the motor-frame is "fastened to the plate by a'bolt 80. A

' screw 81 threadedfrthrough thefree end of the plate 78 4 abuts against a projection 82 on the upper side of the casting 37 to hold the motor stationary whenthe pump is assembled. By turning the screw 81, the motor may be tilted about the axis of the pivot 79 to tighten or loosen the belt 13.

In operation, water is poured into the suction chamber 24 through the vertical passage 45 to prime the pump and the cap 46 is replaced. The motor. 11 then is started to turn the crank 16 and reciprocate the piston 10. On

the forward stroke of the piston, water '-is drawnfrom the suction chamber through'the port 28 and intothe piston chamber 23. On the return stroke, the'water drawn into the chamber 23 'is forced into the: discharge chamber 26 and out through the outlet pipe 34 and, at the same time, water from the suction chamber is drawn into the forward piston chamber 22. As the cycle is repeated, water is alternately drawn into and forced out of. the two:piston.chambers-22, and 23.

It will be observedthat the pump .with the casing 12 as described above is comparatively simple :to manufacture and provides easyaccessto the parts,-.such as the valves 30 and the piston 10, which normally are the parts-requiring repair and replacement. For example, the valve plate 61- maybe removed simply by'loosening the. bolts 63 and swinging the casing section 36 slightly. awayfrom the section-35. By loosening boththe bolts 63 and:the

bolts 67,'

the'three casing sections

35, 36, and 37 may be separated so that the seal 69 and the piston 10also=are accessible. Since the parts generally requiring repair are in the sections 36 and'37, the. section 35 neednot be moved and thus, as a rule it is not necessaryto disturb either the electrical connections tothe .motor. 11 orthe connections of the inlet and outlet pipes 32 and34. In addition, the arrangement permits thezdischarge. chamber 26 to be above the suction chamber 24. so that anyairin the system'flows up and out through the outlet.pipe.34 rather than being trapped in one oftthepistona chambers 22 and 23. Further, by resting the pumponl'the. casing section 35, a two pedestal support isprovidedsimply by adding the leg 74.

I claim as my invention:

1. In a pump adapted to be mounted. on a baseand having a piston, a rod projecting from the piston, a rotary .crank, and a pitman connecting said crank androd, the combination of, a first rigid' hollow casing section adapted to be stationarily secured to said base and'defining separated suction and discharge chambers each opening outwardly through the casing section" for communication with inlet and outlet pipes respectively, amember mounted on said casing section andproviding a support for a motordriving said crank, aflat machined surface facing outwardly from a vertical side wall of said casing section and having laterally spaced ports therethrough respectively communicating with said suction and discharge chambers, a second hollow casing section defining a horizontal cylinder for said piston andhaving a firstfl'atvertically disposed machined. surface with valve controlled ports extending therethrough and communicating 'withopposite ends of the cylinder, fastening elements detachably joining said casing. sections with .said machined surfaces opposing each other-, said second casing section having a second flat machined surface disposed in a vertical plane and at right. angles to said first surface, a rigidv hollow. part supportinglsaid crank and having a flatv machined surface abutting against and mating with the second machined surface-on said secondsectiomsaid pistonrod extending horizontally outwardly through the second surface of said second section-and into said part to connect-withsaid crank, and means detachably connecting said part .andsaid second'section, whereby to permit access'to theirnoving parts of the pump and to said valve-controlled ports-without removing-said first section from the base-and without disconnecting said pipes and said-motor.

2. A pump as-defined inv claiml, in'whic'hthe hollow part includes means for supporting said part on said base and independently of said first casing section.

References Cited in the file of this patent UNITED STATES PATENTS Ehret Oct. 25, 1938 Larson Jan. 11, 1940 Rumore June 2, 1942 Hoffman et a1 June 1, 1948 Theis Aug. 31, 1954 FOREIGN PATENTS Sweden of 1912 Great Britain Jan. 23, 1935