Pumps – Expansible chamber type – Valved piston
Reexamination Certificate
2001-04-12
2003-05-06
Koczo, Michael (Department: 3746)
Pumps
Expansible chamber type
Valved piston
Reexamination Certificate
active
06558141
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to packings for use in an annular packing space between a first cylindrical member which reciprocates within a cylindrical bore of a second member, and more particularly, but not by way of limitation, to such packing sets specifically designed for use in sealing the high pressure ends of a reciprocating plunger pump utilized for pumping fluids and slurries.
DESCRIPTION OF THE PRIOR ART
Reciprocating pumps and packing seals therefor are generally known with respective examples being shown in U.S. Pat. No. 5,647,737, the disclosure of which is incorporated herein by reference. These reciprocating pumps are operatively connected to a reciprocating drive means such as a piston type motor by a piston tube. The piston tube is directly connected to the base of the motor and encloses a reciprocating pump member which includes a number of seals.
Typically in high pressure reciprocating pumps, the seal between the reciprocating plunger and the cylinder comprises a packing arrangement including a plurality of V-shaped packing rings held in longitudinal compression with various male and female adapters at the forward and rearward ends of those packing sets. Generally, an upper packing arrangement and a lower packing arrangement is provided with the upper packing arrangement being stationary within the piston tube and the lower packing being located at and being movable with the end of the reciprocating plunger in the piston tube.
Very high pressures on the order of many thousands of pounds per square inch are typically involved in pumping operations involving these reciprocating pumps. Additionally, the fluids in the case of slurries are often very abrasive because they carry large quantities of solid particles therein. As a result, a very difficult sealing problem is encountered at the high pressure end across the lower packings of these pumps, where the fluid or slurry must be prevented from leaking between the reciprocating plunger and the cylinder within which it reciprocates. This leaking problem is further exacerbated by deterioration problems encountered in the use of such packings including the deterioration of the V-shaped packing rings due to the hydraulic load from the high pressure fluid end of the pump.
The foregoing illustrates limitations known to exist in present devices and methods. Thus, it is apparent that it would be advantageous to provide an alternative directed to overcoming one or more of the limitations set forth above. Accordingly, a suitable alternative is provided including the features more fully disclosed hereinafter.
SUMMARY OF THE INVENTION
In one aspect of the present invention, this is accomplished by providing a packing assembly for sealing a space between a pump plunger and a pump body of a reciprocating plunger pump with a plunger having a pumping end with an outer perimeter. At least one seal is disposed around the pumping end of the plunger and a securing member having a first end capable of attachment to the pumping end of the plunger. A second end having a flange with an outer perimeter greater than the outer perimeter of the pumping end of the plunger is also provided, such that when the first end of the securing member is attached to the pumping end of the plunger, the second end maintains the at least one seal disposed around the pumping end of the plunger.
The foregoing and other aspects will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawing figures.
REFERENCES:
patent: 2358949 (1944-09-01), Trautman
patent: 2673103 (1954-03-01), Tremolada
patent: 3019739 (1962-02-01), Prosser
patent: 3046070 (1962-07-01), Gearhart
patent: 3168869 (1965-02-01), Sieghartner
patent: 3372648 (1968-03-01), Hammelmann
patent: 3655207 (1972-04-01), Schettler
patent: 3698726 (1972-10-01), Schettler
patent: 3742822 (1973-07-01), Talbert
patent: 3776558 (1973-12-01), Maurer et al.
patent: 3787149 (1974-01-01), Dane et al.
patent: 3834715 (1974-09-01), Butler
patent: 3982471 (1976-09-01), Finger
patent: 4093240 (1978-06-01), Masuda et al.
patent: 4141676 (1979-02-01), Jannen et al.
patent: 4277229 (1981-07-01), Pacht
patent: 4306728 (1981-12-01), Huperz et al.
patent: 4364542 (1982-12-01), Meyer
patent: 4440404 (1984-04-01), Roach et al.
patent: 4470607 (1984-09-01), Schier et al.
patent: 4474382 (1984-10-01), Hjelsand
patent: 4495855 (1985-01-01), Murakami et al.
patent: 4512586 (1985-04-01), Smith
patent: 4568249 (1986-02-01), Todd
patent: 4572519 (1986-02-01), Cameron et al.
patent: 4602791 (1986-07-01), Zollner
patent: 4716924 (1988-01-01), Pacht
patent: 4875690 (1989-10-01), Tojo
patent: 4960039 (1990-10-01), Robertson
patent: 5040608 (1991-08-01), Doan
patent: 5111736 (1992-05-01), Buchberger et al.
patent: 5127807 (1992-07-01), Eslinger
patent: 5129625 (1992-07-01), Wood et al.
patent: 5230498 (1993-07-01), Wood et al.
patent: 5348454 (1994-09-01), Murphy
patent: 5398944 (1995-03-01), D'Alfonso et al.
patent: 5456583 (1995-10-01), Handzel
patent: 5577737 (1996-11-01), Lacy
patent: 5647737 (1997-07-01), Gardner et al.
patent: 6164659 (2000-12-01), Netzer et al.
Falcon and Falcon II Pumps, Instructions-Parts List, No. 308996 Rev.A, Graco Inc., ©Copyright 1999, Graco Inc., 3 pages.
Vonalt Kerry G.
Wiechers Jonathan T.
Ingersoll-Rand Company
Koczo Michael
Michael & Best & Friedrich LLP
LandOfFree
Packing assembly and reciprocating plunger pump... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Packing assembly and reciprocating plunger pump..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Packing assembly and reciprocating plunger pump... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3025419