Power plants – Pressure fluid source and motor – Having distinct cooling or lubricating structure
Patent
1998-05-01
2000-11-14
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Having distinct cooling or lubricating structure
92144, 417258, 417372, F15B 2104
Patent
active
061453110
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
A pneumo-hydraulic converter with reciprocating double piston which connects a compressed air storage and a hydraulic circuit at maximum efficiency in such a way that energy can flow into the storage (charging) or can be removed from the storage (discharging) is known.
The good efficiency of isothermal processes is obtained in the above system by stabilizing the temperature in the working chambers (piston spaces) during each stroke by means of the operating medium, i.e., oil. This will result in relatively slow working processes, since the limited velocity of the heat transfer from the lateral surface of the cylinder to the air during the working stroke cannot compensate the temperature fluctuations at increased cycle frequency. As a consequence, the structual units employed are comparatively large in relation to the power involved.
It is the object of this invention to achieve good efficiency while increasing the cycle frequency at the same time.
SUMMARY OF THE INVENTION
According to the invention tubular heat exchangers pass through some of the working chambers of the converter and an exterior circuit maintains the exchange fluid approximately at ambient temperature.
This heat exchanger may either be carried along by the set of reciprocating pistons, or remain stationary. Since the heat exchanger moving along with the pistons will require fewer sliding sealings (approximately by one third), and the bundle of tubes will considerably increase the buckling and deflection strength of the piston set, the present description will be restricted to presenting the converter with movable heat exchanger. To achieve the desired increase in cycle frequency, an arrangement of working chambers is called for which involves a dramatic reduction of dead volumes and will hence generate high buckling forces. As a consequence, buckling strength will become an extremely important structural factor which must also be allowed for when deciding on the arrangement of the valves.
As the converter is designed to operate as both compressor and decompressor, the valve sets on each side--each consisting of high-pressure valve, exchange valve, low-pressure valve--must be subject to forced control; under certain conditions it is possible to pair off the movements of exchange valve and low-pressure valve. The configuration of these valves must fulfill the topological requirements of the heat exchanger as well as the strict demand for the smallest possible dead volumes. The solution of these tasks and the operation of the device proposed by this invention will now be explained by means of the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a longitudinal section through the axis of the four cylindrical working chambers,
FIG. 2 is a section transversely to the axis in FIG. 1, through the high-pressure chamber and through the tube bundle of the heat exchanger,
FIG. 3 illustrates the same section as FIG. 2, though with a bridge across the tubes of the bundle.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In its high-pressure variant the converter includes three coaxial and approximately equal lengths of cylindrical pipe: the pre-pressure pipe 1 and the high pressure chamber pipes 3a, 3b, the pre-pressure pipe 1 containing the pre-pressure piston 2 and having a significantly larger diameter than the two high-pressure chamber pipes 3a, 3b which are symmetrically arranged vis-a-vis the pre-pressure pipe 1 and contain the equally symmetrical high-pressure pistons 4a, 4b. Since both movable and stationary parts are mirror-symmetrical relative to the longitudinal centre plane, the pre-pressure pipe 1 is connected via valve flanges 5a, 5b to the two screwed-in high-pressure chamber pipes 3a, 3b, which are closed off on the other ends by fitting covers 7a, 7b fastened by screw caps 6a, 6b. Axially sliding in the cylindrical pipes are a set of three pistons which are rigidly connected by the tubular rod 8 and will thus define 2.times.3 working chambers, i.e., oil chambers 9a, 9b between cove
REFERENCES:
patent: 129631 (1872-07-01), Waring
patent: 255116 (1882-03-01), Rand
patent: 4761118 (1988-08-01), Zanarini
patent: 4818192 (1989-04-01), Korthaus
patent: 5564912 (1996-10-01), Peck et al.
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