Expansible chamber devices – With assembly or disassembly facilitating means
Reissue Patent
1998-11-12
2001-12-25
Ryznic, John E. (Department: 3745)
Expansible chamber devices
With assembly or disassembly facilitating means
C092S13000R, C092S1650PR, C092S171100
Reissue Patent
active
RE037483
ABSTRACT:
This invention is in the field of reciprocating pumps and particularly relates to a means for aligning and securing the cylinder liners of such pumps to their respective pumping modules. The means is also adapted to
energise
energize
the seals of such liners.
Reciprocating pumps are well-known and a particular example discussed in the present specification is oil-field mud pumps. The invention is not, however, limited to mud pumps but finds application in a variety of reciprocating or positive displacement pumps.
In the past, there have been several different types of ways to attach cylinder liners to their respective pumping modules and these may vary according to make of pump in which they are used. One embodiment presently known employs a tapered concentric clamp,
whale
while
another uses a concentric screw clamping arrangement.
It is important that the means for aligning and securing the cylinder liners may be implemented without undue effort and down-time. Cylinder liners are required to be changed frequently and this causes considerable inconvenience if the means and method for releasing the old cylinder liners and fitting the replacement cylinder liners are slow or difficult to operate. It has been found that existing systems or means for securing cylinder liners to respective pumping modules have been difficult to operate for a plurality of reasons, including the involvement of heavy components, the handling of which may be dangerous for operators. These systems also require considerable strength, skill and reliability of operators, together with the use of heavy tools in confined spaces. Yet further, the securing force is dependent on the extent of wear and the general condition of a plurality of the securing components.
According to the invention, there is provided a means for securing cylinder liners to pumping modules in reciprocating pumps, wherein said means includes a plurality of arrangements having a piston slidable within a hydraulic cylinder, said pistons having a rod adapted to receive a nut, said rods extending outwith their respective cylinders and being passed through respective apertures in a member adapted to grip said cylinder liner, wherein retraction of said piston and nut causes said member to forcibly compel said cylinder liner towards said pumping module.
Preferably, said arrangements are fastened to said pumping module. Preferably, said arrangements also include a spring or springs for location between the top of said cylinder and the piston. Hydraulic fluid can be inserted between the piston and the cylinder base by an external pressure source.
Preferably, there are four or more said arrangements spaced at intervals about and externally of the circumference of the cylinder liner.
Preferably, said means further includes non-rotational apparatus for preventing rotation of said pistons within said cylinders, wherein said non-rotational apparatus preferably includes one or more dowel rods which extend between said pistons and said cylinder base.
Preferably said member comprises a clamping ring having corresponding apertures for receiving said piston rods.
REFERENCES:
patent: 3435777 (1969-04-01), Schaaf
patent: 3438334 (1969-04-01), Schaaf
patent: 3635616 (1972-01-01), Venkatesan
patent: 3842718 (1974-10-01), Malchow
patent: 4566372 (1986-01-01), Zandel et al.
patent: 23 56 604 (1975-05-01), None
patent: 24 11 927 (1975-05-01), None
patent: 28 55 454 (1979-08-01), None
patent: 32 18 000 (1983-11-01), None
patent: 1 584 158 (1981-02-01), None
Flindall Stephen J.
Kennedy George C.
P-Quip Limited
Ratner & Prestia
Ryznic John E.
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