Pumps – Successive stages – Reciprocating rigid stages
Patent
1996-11-18
1999-11-16
Freay, Charles G.
Pumps
Successive stages
Reciprocating rigid stages
417397, F04B 500
Patent
active
059846429
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a pressure intensifier for pressurization of a medium, comprising a low-pressure cylinder, in which a low-pressure piston is axially displaceable, a first and a second high-pressure chamber for receiving the medium, in which high-pressure chambers a first and a second high-pressure piston, respectively, are axially displaceable, and at least one inlet and one outlet for the medium, wherein the first and second high-pressure chambers are arranged coaxially with the low-pressure cylinder and on one side each thereof, and wherein the first and second high-pressure pistons are secured to the low-pressure piston.
The pressure intensifier according to the invention is especially suitable to use when the pressurized medium is utilized to generate a high pressure in an external pressure device, for example a press, which is arranged outside the pressure intensifier and for high-pressure treatment of liquid substances.
BACKGROUND ART
Pressure intensifiers have long been used to pressurize media to very high pressures. Usually, the pressure intensifier comprises a low-pressure chamber and one or more high-pressure chambers. In the low-pressure chamber a low-pressure piston is displaceably arranged. This low-pressure piston is secured to a high-pressure piston in the respective high-pressure chamber. The low-pressure piston has an area which is larger than the area of the high-pressure pistons.
Upon pressurization of a medium, the medium is supplied through an inlet to the high-pressure chamber. The inlet is closed, whereupon a certain relatively low pressure is supplied to the low-pressure chamber. This usually occurs hydraulically. When the supplied pressure acts on the low-pressure piston, the piston is displaced, causing the high-pressure piston to be displaced inwards in the high-pressure chamber. Since the high-pressure piston has a smaller area than the low-pressure piston, the displacement will result in a certain higher pressure of the medium in the high-pressure chamber. The pressurized medium can thereafter, via an outlet arranged in the high-pressure chamber and via high-pressure conduits, be passed on to an external pressure device, for example a press. With this type of pressure intensifier, pressures up to around 15000 bar may be attained.
One known type of pressure intensifier comprises two high-pressure chambers. These high-pressure chambers are arranged coaxially with the low-pressure chamber, one on each side thereof. Each high-pressure chamber is limited at its outer ends by an end member and exhibits an axially displaceable high-pressure piston which is secured to the low-pressure piston in the low-pressure chamber. When the low pressure is supplied to the low-pressure chamber on one side of the low-pressure piston, the low-pressure piston is displaced in the opposite direction. This leads to generation of the high pressure in that high-pressure chamber which is arranged on that side of the low-pressure piston which is opposite to that where the low pressure is supplied.
By alternately supplying the low pressure to each side of the low-pressure piston, this type of pressure intensifier may be caused to operate as a double-acting pump. When the pistons are in one of their end positions, the first high-pressure chamber is empty and the second high-pressure chamber is filled with non-pressurized medium. When, thereafter, the pistons are displaced towards the other end position, the first high-pressure chamber is filled with non-pressurized medium via its inlet. At the same time, during the first part of the displacement, the medium in the second high-pressure chamber is pressurized. During the remaining displacement, when the high pressure has been achieved, the pressurized medium is pressed out of the second high-pressure chamber and via its outlet and a high-pressure conduit to the external pressure device where the same high pressure prevails. When the pistons are moved back to their first end position, the second high-pressure chamber is fille
REFERENCES:
patent: 1568447 (1926-01-01), Forsyth
patent: 1616774 (1927-02-01), Warren
patent: 2173413 (1939-09-01), Foster
patent: 5094081 (1992-03-01), Osborne
Flow Holdings GmbH (SAGL) Limited Liability Co.
Freay Charles G.
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