US2563949A

US2563949A - Cylinder construction

Info

Publication number: US2563949A
Application number: US697066A
Authority: US
Inventors: Roy M Magnuson
Original assignee: Individual
Current assignee: Individual
Priority date: 1946-09-14
Filing date: 1946-09-14
Publication date: 1951-08-14
Anticipated expiration: 1968-08-14

Description

Aug. 14, 1951 R. M. MAGNUSON 2,563,949

CYLINDER CONSTRUCTION Filed Sept. 14, 1946 2 Sheeis-Sheet 1 FIE E I ugly ||u INVENTOYR I 5 B pay M Maj/71150 4/ 73 33 F I I5 EA.

ATTORNEY Patented Aug. 14, 195i ifihit UNITED STATES PATENT OFFICE 2,5'63,949- I CYLINDER CONSTRUCTION Roy M. Magnuson, Campbell, Calif. 1 Application September 14, 1946, Serial No. 697,066

9 Claims. 1

This invention relates to pumps and is concerned more particularly with pumps of the reciprocating type employing a piston especially adapted for high pressure operation with liquids containing abrasives.

It is a general object of the invention to provide an improved piston-type pump. 1

Another object of the invention is to provide an improved pump of the above character for use with abrasive-containing liquids;

A further object of the invention is to provide a pump of the above character having a quick replaceable pump packing.

Another object of the invention is to provide for lubrication of a pump packing of the type employing pressure sealing end faces.

Another object of the invention is to provide a pump of the above character in which the mechanical drive portion of the pump is shielded from leakage. fluid of the hydraulic portion thereof.

A further object of the invention is to provide a hydraulic assembly of a piston pump which can be disassembled readily for cleaning.

Another object of the invention is to provide a pump of the opposed piston type in which the drive is transmitted to a pair of opposed pistons in a simple and advantageous manner.

Another object of the invention is to provide improved means for preventing contamination of the lubricating oil of'a pump drive mechanism by the liquid being pumped.

A further object of the invention is to provide an improved check val e construction for the pump. I I

A further object of the invention is to provide an improved pump packing unit which is supported independently of the piston and the cylinder of the pump.

Other objects and advantages of the invention will be apparent from the following description pump taken in planes indicated in line 4-4 in Figure 1.

Figure 5 is an end elevational view of the upper or hydraulic portion of the pump.

Figure 6 is a fragmentary sectional view taken as indicated by the line 6-6 in Figure 1.

Figure 7 is a fragmentary sectional view showing an enlargement portion of the pump packing.

Figure 8 is an enlarged sectional view of the check valve and its mounting.

Referring to the drawings, the pump includes a crankcase III of cast construction which houses the pump drive mechanism and a cylinder case ll of cast construction which houses the hydraulic mechanism and whichvis secured on the crankcase by four cap screws l2. The crankcase Ill (Figures 2, 3 and 4) is provided with opposite bosses l3 in which a drive shaft I4 is journalled by means of sleeve bearings IS. The bosses l3 are apertured at IT for admission of splashed oil to the bearings. Between the bearings iii a drive pinion I8 is pinned or otherwise secured on the shaft 14. The drive pinion I8 (Figures 2 and 3) meshes with a drive gear 19 .whose integrally formed hub la is journalled by sleeve bearings 2| on a supporting shaft 22 which is secured in bosses 24 of the crankcase. The shaft 22 is grooved adjacent its ends at 22a to register with oil receiving pockets 23 in the bosses 24. The shaft 22 is threaded at each end to receive a cap screw 26 which serves to secure in place and tighten a rubber securing and sealing ring or washer 21 by means of a metallic washer 28. The sealing ring 21 is expanded for pressure engagement within the apertured boss 24 to effect a tight seal and frictionally hold the shaft 22 against rotative and endwise displacement. The shaft 22 is apertured axially at 22b and radially at 22c for feeding of lubricant to the bearings 2|.

' The drive from the drive gear l9 (Figures 2 and 3) is transmitted by means of an eccentric I 9b formed integrally with the gear l9 and its hub I9a. Engaged about the eccentric l9b is an eccentric follower 3| which is lubricated through a passage I in the eccentric I912. The eccentric follower 3| (Figure 2) is connected by a pivot pin 32 to a bellcrank drive element 33 which is mounted on a shaft 35 secured within opposed bosses 34 of the crankcase by securing nuts 30 and sealing and securingLrings 30a similar to the nuts 26 and rings 21 previously referred to. In this case the right-hand nut 30, as viewed in Figure 3, is providedwith a lubricant fitting 34a for introduction of lubricant into the axial passages 35a and the radial passages 35!: and to the on theshaft 35.

seat on respective cylindrical end extensions of the crosshead 89 to which they are secured by cap screws 42 which extend through central bores of the piston and have threaded engagement with the crosshead. If desired, the central bores of the pistons may be threaded to facilitate removal thereof from the crosshead.

Each of the pistons 4| (Figures 2 and '7) is slidably disposed within a packing member "48 including a cylindrical packing portion 44 of suitable oil and acid resistant rubber, such as synthetic rubber, bonded on a sleeve 45 which is provided with .roughened or knurled outer and inner surfaces at one end to insure a firm bond. The sleeve 45 is threaded at its other endior engagement within a threaded portion of a cylinder,head or closure 46 secured on the cylinder case M by suitable bolts 4'! and with a suitable sealing ring interposed. There are two bolts in number for each head 46 as seen in Figure 5. Adjacent. its threaded end, the sleeve 45 is provided with a suitable array of liquid transmitting holes. The packing element or portion 44, as seen clearly in Figure '7, is provided with a cupfaced end surface 44a. at each end thereof to provide annular sets of opposite pressure-responsive sealing lips. The packing portion 44 is also provided with annular tapering recesses adjacent each end face 44a, and with centrally located outer and inner annular recesses 44b and No. The outer and inner annular recesses 44b and 440 are joined by a series of radial apertures 44d which extend through the sleeve 45. Preferably, the central or bearing surfaces of the packing portion 44 at either side of the annular recesses 44b and 440 are formed of resilient material of a harder type than the end or sealing surfaces 44a. The packing 44 fits within the cylinder wall 5| which at one side is apertured to receive a lubricant fitting 52 (Figures 1 and 4) so that lubricant can be introduced into the annular recesses 44b and 440 for lubrication ofthe packing.

Each cylinder space of the cylinder case Ii is providedwith an inlet passage 56 (Figure 6) which leads to a check valve chamber 51 formed in a boss 58 in the casting and having the end openings therein closed by plugs 59. The reduced diameter within the boss 58 provides a tapered mounting or seat for a tapered annular valve seat member 6| of stainless steel or other suitable material having a rounded upper end surface on which a poppet valve 62 is seated normally under the urgency of a spring 63. As seen more clearly in Figure 8, the valve 62 is formed of a metal body member 62a having a central turned portion to receive the spring 68 withan annular spring seat at the base of the turned portion within which the end coil or the spring 63 engages. The spring 63 is seatedat its other end in a recess of the adjacent plug 59 and'serves to center the valve 62 on the valve seat 6| as well as to urge the valve against the seat. The valve 62 also includes a rubber facing or portion 62b which is bonded to a knurled face of the body 4 within the valve seat 6| and is of streamlined contour to provide a smoothly and uniformly directedfiow of liquid past the valve when it is lifted from the seat.

Each inlet check valve chamber 61 (Figures 2. I

3 and 4) communicates below its valve 62 with a longitudinally extending intake passage 66 by -means of which liquid can be introduced through one or more of a pair of tapped openings 81 leading to the passage 66. This passage 66 is common toboth of the piston and cylinder arrangements of the pump.

To provide for discharge of liquid from each of the cylinders, a discharge passage 68 (Figures 2 and 3) is provided to which each of the cylinders has communication through a check valve 62 of the construction and previously described in connection with the intake check valve. The discharge passage or chamber 68 is provided with a pair of tapped outlet openings 69.

It will be noted with reference to Figures 2 and 3 that the crank case I8 is provided with oppositely disposed mounting pads Illa by means of which the pump is mounted in upright position, and means is provided for shielding the crankcase from leakage fluid from the hydraulic system so that the oil in the crankcase ill will not be contaminated. The top of the crankcase I0 is provided with a sheetmetal cover 1| having an upturned baflie wall or shield 12 disposed bellcrank. Cooperating with the shield 12 is a depending baiile or shield 13 secured beneath the crosshead 39 and freely telescoping or overlapping the shield 12 so that any drainage liquid from the hydraulic system is effectively bailied against entry within crankcase ID by virtue of the tortuous path it would have to follow around the shields 13 and I2. Drainage liquid from the hydraulic system falls onto the cover H and is discharged through one or more drainage openings 10 (Figure 2).

To provide for lubrication of the crosshead block 88 in its relative movement with respect to both the wrist pin 31 and the crosshead 39, the crosshead 39 is provided with a recessed lubricant fitting 1B (Figure 4) adapted for alignment with an opening 11 in the cylinder case II. The opening 11 normally is closed by a spring cap I8. The lubricant fitting 16 communicates with the wrist pin 31.

portion 62a and also within a central recess therein. To guide the flow of liquid the rubber portion 62b is provided with acentral conically shaped projection or tip which extends down In operation of the above pump, upon transmission of a drive to the drive pinion l8 and the drive gear I9, each piston 4| is operative during its suction stroke to draw liquid into the associated cylinder past its intake check valve 62 and then, upon the pressure stroke. to effect discharge of this liquid past its discharge valve 62. It will be noted that the cylinders alternately load and unload. In the dead center position of partsshown in Figure 2 the axis of the wrist pin 81 is slightly above the longitudinal axis of the istons, and, at the end of its movement in either direction, the wrist pin axis moves slightly below thepiston axis by an equal amount. This amount of movementis insufficient tointerrupt lubrication between the lubricant passages 18 and 8|.

During the suction stroke of a piston the cupfaced end 44a of the packing element 44 remote from the sleeve 45 expands under atmospheric pressure to press the annular lips against the piston and cylinder wall, respectively, and prevent introduction of air into the cylinder. Upon the pressure stroke, the cup-faced end of the packing which is interrupted by the sleeve 45 is flattened out so that its lips prevent leakage of liquid during such pressure stroke.

It will be noted that the above replaceable packing construction provides for removal of the packing (by removing the two bolts 41) with the head 46. Then by unscrewing the sleeve 45 from the head 46 and replacing the worn packing assembly with a new one, the reverse operations can be performed to install the new packing and cylinder head.

The above pump construction is especially useful in high pressure handling of abrasive liquids, such as spray liquids for use against insect pests.

Figure 2-A shows a modified form of drive connection between the crosshead 39 and the operating bellcrank 33 therefor. In this construction, the wrist pin 31 carries a roller or ball bearing 40 which is interposed between a pair of hardened buttons 40a, and the buttons 49a are mounted preferably in offset or eccentric relation to the bearin 40. In this way the bearing will impart an oscillatory or rotative movement to the buttons to distribute the wear. If desired, one or more of the buttons 40a may be provided with a lubricant passage (not shown). The buttons 40a may also be employed in conjunction with the drive block 38 if desired. Also, shims may be employed beneath the buttons to compensate for wear.

While I have shown and described certain preferred embodiments of the invention, it can be embodied in other forms and its scope should be limited only by the claims appended hereto.

I claim:

1. In a pump, a cylinder, a cylinder closure, a piston within the cylinder and spaced from the wall of the cylinder, and a packing member interposed between the cylinder wall and the piston in sealing relation therewith and connected to the closure for insertion and removal therewith.

2. In a pump, a cylinder, a cylinder head, a piston within the cylinder and spaced from the wall of the cylinder, and a packing member interposed between the cylinder wall and the piston in sealing relation therewith and mounted on the cylinder head for insertion and removal therewith.

3. In a pump, a cylinder, a cylinder closure, a piston within the cylinder and spaced from the wall of the cylinder, and a packing member interposed between the cylinder wall and the piston in sealing relation therewith. said packing member comprising a sleeve detachably connected to the closure and a resilient packing element carried by the sleeve.

4. In a pump, a cylinder, a cylinder closure, a piston within the cylinder and spaced from the wall of the cylinder, and a packing member interposed between the cylinder wall and the piston in sealing relation therewith, said packing member comprising a slee e detachably connected tothe closure and a resilient packing element bonded about one end of the sleeve.

5. In a pump, a cylinder, a cylinder closure, a piston within the cylinder and spaced from the wall of the cylinder, and a packing member interposed between the cylinder wall and the piston in sealing relation therewith, said packing member comprising a sleeve detachably connected to the closure and a resilient packing element carried by the sleeve having cup-faced ends providing pressure-responsive sealing lips.

6. In a pump, a cylinder, a cylinder closure, a piston within the cylinder and spaced from the wall of the cylinder, a packing member interposed between the cylinder wall and the piston in sealing relation therewith and connected to the closure for insertion and removal therewith, an annular groove on the inner surface of said packing member, and lubricating passage means leading through the wall of said cylinder an said packing member to said groove.

7. In a pump, a cylinder, a cylinder closure, 9. piston within the cylinder and spaced from the wall of the cylinder, a packing member interposed between the cylinder wall and the piston in sealing relation therewith comprising a tubular support element connected to the closure and a resilient packing portion secured on the support element, an annular groove on the inner surface of said packing portion, and lubricating passage means leading through the wall of said cylinder and said packing member to said groove.

8. In a pump, a cylinder,-a cylinder closure, a piston within the cylinder and spaced from the wall 01' the cylinder, a packing member interposed between the cylinder wall and the piston in sealing relation therewith comprising a tubular support element connected to the closure and a resilient packing portion secured on the support element, respective annular grooves on the inner and outer surfaces of said packing portion, passage means in said packing member connecting said grooves, and means for supplying lubricant to the outer annular groove.

9. In a pump, a cylinder, a cylinder closure, a. piston within the cylinder and spaced from the wall or the cylinder, and a packing structure detachably connected to said cylinder closure and including a sealing portion disposed inwardly from said cylinder closure and interposed between the cylinder wall and the piston in sealing relation therewith, said sealing portion including respective cup-faced ends of resilient material providing pressure responsive sealing lips engaging said cylinder wall and said piston at both ends of the packing structure.

ROY M. MAGNUSON.

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

UNITED STATES PATENTS Joy Mar. 25, 194'!