Power plants – Pressure fluid source and motor – Pulsator
Patent
1997-09-19
1998-11-17
Nguyen, Hoang
Power plants
Pressure fluid source and motor
Pulsator
60561, 60563, 60565, 60567, F15B 700, B60T 1358
Patent
active
058361618
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a hydraulic pressure booster. In a known pressure booster of this type (DE-OS 42 23 411 or WO-93 15 323), the particular problem of this kind of pressure booster, namely the sealing between oil and air between the reservoir chamber that contains the oil and the pressurized air chamber that produces the reservoir pressure, by creating a pressure-relieved chamber disposed between them. Any air or fluid quantities that penetrate at the plunger or the jacket face of the intermediary piston are captured and removed via annular ventilation grooves disposed there. An apparatus of this kind requires an extremely precise coaxial disposition of plunger, intermediary piston, and cylinder jacket. In addition, the necessary sealing requires a number of radial seals that are subject to natural wear and tear. While a radial sealing is for the most part unproblematic to the plunger due to the small diameter, this sealing problem increases super-proportionally with the diameter of the outer piston jacket face.
THE INVENTION AND ITS ADVANTAGES
The hydraulic pressure booster according to the invention, has the advantage over the prior art that in the region of the movable dividing wall, an absolute and quasi wear-free seal can be produced between the oil-filled reservoir chamber and the air chamber disposed on the side of the dividing wall remote from this reservoir chamber. In this case, this can be a pressurized air chamber that determines the pressure in the reservoir chamber as well as a chamber under atmospheric pressure, wherein there can be a spring force that engages the dividing wall and influences the pressure in the reservoir chamber. Also, the reservoir chamber can be accommodated in a separate reservoir that has a connection to the working chamber, which connection is controlled, for example, by the control piston (plunger). Through this kind of a separate disposition of the reservoir, a number of pressure boosters can be supplied by only one reservoir, wherein at the control point between the reservoir chamber and the working chamber according to the invention, a wide variety of types of control device can be inserted, whose type is to a large extent independent of the remaining embodiment of the pressure booster. In this way, any electrically actuated slider or a valve can be used as a control device, without the plunger being eliminated as a result. Due to the absolute seal between the reservoir chamber and the air chamber, the pressure can also be increased, with the advantages mentioned below in an adapted structural embodiment.
According to an advantageous embodiment of the invention, the dividing wall is embodied as tubular, as a corrugated tube that can be changed in the axial direction in the stroke, or as a tube that can be changed in the radial direction in the diameter. Corrugated tubes of this kind are known in a number of ways, for example in the form of a metal compensator or a rubber or plastic protective tubes of telescopes. In the same way, a hydro-pneumatic pressure booster is also known (WO 83/04 288), in which the air pressure chamber is defined by a corrugated tube, which surrounds the pressure piston and thus renders its stroke possible.
According to another advantageous embodiment of the invention, the dividing wall is embodied in the shape of a cone. By means of this, the corrugated tube material can advantageously be more intensely compressed in the axial direction.
According to another advantageous embodiment of the invention, the dividing wall is embodied so that it has an intrinsic elastic resilience and influences the reservoir pressure.
According to another advantageous embodiment of the invention, the dividing wall, which is embodied as a bellows, rolling membrane, tubular membrane, or the like, is comprised of rubber, metal, or another comparable elastic material, for example plastic.
According to another advantageous embodiment of the invention, in order to influence the reservoir pressure, a spring force, for example a helical spring, eng
REFERENCES:
patent: 3875365 (1975-04-01), Beneteau
patent: 5040369 (1991-08-01), Rapp
patent: 5247871 (1993-09-01), Brasca et al.
patent: 5377488 (1995-01-01), Malina
patent: 5381661 (1995-01-01), Malina
Greigg Edwin E.
Greigg Ronald E.
Nguyen Hoang
Tox Pressotechnik GmbH
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