Pipes and tubular conduits – With pressure compensators – Variable capacity chambers
Patent
1988-08-11
1989-11-07
Bryant, Jr., James E.
Pipes and tubular conduits
With pressure compensators
Variable capacity chambers
277 3, P16L 5504
Patent
active
048785199
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a pressure accumulator. More particularly this invention concerns a gas-charged piston-typed accumulator used to maintain pressure in a hydraulic system.
BACKGROUND OF THE INVENTION
A standard piston-type pressure accumulator has a cylinder forming a chamber that is subdivided into a gas compartment and a liquid compartment by a piston which is movable to increase the volume of one of the compartments while decreasing that of the other and vice versa. The gas compartment is filled with a gas under pressure, usually compressed air, and the liquid compartment is connected to the hydraulic system whose pressure is to be maintained.
Normally a passage provided with a check valve opens directly into the gas compartment and serves for charging same. A screw connection permits the charging equipment to be connected to this passage. Such construction is fairly complex and therefore elevates the cost of the accumulator.
OBJECTS OF THE INVENTION
It is therefore an object of the present invention to provide an improved accumulator.
Another object is the provision of such an improved accumulator which overcomes the above-given disadvantages, that is which is of simple and inexpensive construction.
SUMMARY OF THE INVENTION
These objects are attained according to the invention in an accumulator comprising a cylinder formed with a substantially closed chamber and a piston formed with a small-diameter central region and a pair of large-diameter end regions flanking the central region and each formed with an outwardly open annular groove. This piston subdivides the chamber into a gas compartment at one of the end regions, a liquid compartment at the other end region, and an annular charging compartment surrounding the central region. The piston is displaceable in the cylinder to oppositely vary the volumes of the gas and liquid compartments. Respective gas and liquid seals are engaged in the grooves between the gas- and liquid-compartment end regions of the piston and the cylinder and are both constructed to inhibit fluid flow from the respective gas and liquid compartments into the charging compartment. According to this invention the liquid seal is also constructed to inhibit fluid flow from the charging compartment into the liquid compartment but the gas seal is constructed to permit fluid flow from the charging compartment past itself into the gas compartment. A passage is formed in the cylinder opening directly into the charging compartment for introducing a gas under pressure into same and for thereby pressurizing the charging and gas compartments by flowing the gas past the gas seal into the gas compartment .
DESCRIPTION OF THE DRAWING
The above and other objects, features, and advantages will become more readily apparent from the following, reference being made to the drawing in which:
FIG. 1 is a longitudinal section through a piston accumulator,
FIG. 2 shows a top view of a sealing ring,
FIG. 3 shows a section along III--III according to FIG. 2,
FIG. 4 shows a partial section of another embodiment example.
DESCRIPTION OF THE EMBODIMENT EXAMPLE
The housing of a piston accumulator, which housing is constructed so as to be approximately cylindrical and hollow, is designated by 10 in FIG. 1; its opening is closed by means of a cover 11. A piston 13 is guided in the cylindrical bore hole 12 of the housing 10 so as to slide in a tight manner. It has a central necked-down portion 14, so that collars 15 and 16, which have a slight play, result at both sides of same. The piston 13 separates a gas space 18 from a liquid space 19. At the collar 15 of the piston 13, an elongate annular groove 20 is constructed which comprises a portion 21 which is partially conically reduced toward the gas space. Three annular elements, namely a profile ring 22 facing the gas space, a subsequent O-ring 23, and a supporting ring 24, which is arranged downstream of the latter and comprises an approximately rectangular cross section, are arranged in this annular groove.
At
REFERENCES:
patent: 2673527 (1954-03-01), Ashton et al.
patent: 2817361 (1957-12-01), Mercier
patent: 3015345 (1962-01-01), Michael
patent: 4674541 (1987-06-01), Fulmer
patent: 4685491 (1987-08-01), Fulmer et al.
patent: 4693276 (1987-09-01), Fulmer
Berding Josef
Bertling Hannes
Lees Thomas
Pabst Carsten
Bryant, Jr. James E.
Robert & Bosch GmbH
Striker Michael J.
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