EP0468788A1 - Dispositif multiplicateur hydraulique pour vérin rectiligne - Google Patents

Dispositif multiplicateur hydraulique pour vérin rectiligne Download PDF

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Publication number
EP0468788A1
EP0468788A1 EP91306788A EP91306788A EP0468788A1 EP 0468788 A1 EP0468788 A1 EP 0468788A1 EP 91306788 A EP91306788 A EP 91306788A EP 91306788 A EP91306788 A EP 91306788A EP 0468788 A1 EP0468788 A1 EP 0468788A1
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EP
European Patent Office
Prior art keywords
piston
booster
primary
compartment
disposed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91306788A
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German (de)
English (en)
Inventor
John J. Wright
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0468788A1 publication Critical patent/EP0468788A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/08—Characterised by the construction of the motor unit
    • F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
    • F15B15/1409—Characterised by the construction of the motor unit of the straight-cylinder type with two or more independently movable working pistons

Definitions

  • the present invention relates generally to a linear actuator used in moving, for example, gate valves and sluice gates, where an increased thrust is required during the initial movement of the valve. More particularly, the present invention is a novel booster piston movably disposed about a piston rod of a linear actuator which is capable of providing additional thrust to a piston.
  • Linear actuators comprising piston means displaced by fluid or air pressure are typically used to control the opening and closing of valves, e.g., gate valves and sluice gates.
  • valves e.g., gate valves and sluice gates.
  • One of the principal problems encountered in providing actuators of this type to control valves results from the fact that the force required to break the seal upon opening the valve is generally considerably greater than that necessary at any other portion of the opening or closing cycle. This relatively large force is commonly referred to as the "break-away" force and is caused by friction of the valve disk against the valve seat on opening.
  • the Hussey patent provides a working piston which provides the principal opening and closing force and an auxiliary piston which provides a supplemental force during the initial part of the opening cycle and which also acts as a buffer during the final portion of the closing cycle.
  • An operating fluid enters an annular chamber and flows into a compartment adjacent to the primary piston.
  • the fluid adjacent to the primary piston then flows from that compartment into another compartment adjacent the auxiliary piston by means of a conduit within the auxiliary piston.
  • the force of the fluid pressure in the compartments acting against the pistons urges them both to the right.
  • the Topinka patent discloses a dual motor having both a large diameter piston and a small diameter piston for actuation of a single piston rod.
  • the Topinka patent differs from the Hussey patent in that its fluid receiving chambers for the large and small pistons are isolated from each other so as to adapt the motor for various modes of operation. That is, fluid is pumped into separate isolated chambers associated with each piston in order to actuate the piston rod.
  • an on-off valve may be install within the conduit line supplying fluid to the auxiliary piston and when closed will prevent fluid from being delivered to that piston.
  • the Hussey patent supplies fluid to the compartment associated with the primary piston and then from that compartment to the compartment associated with the auxiliary piston.
  • the Topinka patent includes isolated chambers wherein it may also supply fluid to the primary piston prior to the auxiliary piston depending upon the efficiency of its fluid delivery system.
  • the present invention also provides many additional advantages which shall become apparent as described below.
  • the present invention provides a unique integrated booster piston design which does not require additional lengthening of the housing or separate isolated fluid compartments necessitating additional ports and a sophisticated fluid delivery system. That is, the novel booster piston of the present invention is disposed about the piston rod to permit the rod to travel through the booster piston and thrust column in both directions, while providing a compact dual piston design.
  • the present invention is designed such that the fluid or air pressure acts upon the booster piston prior to the primary piston so that the initial thrust on the piston rod is, in fact, the combined thrust of both pistons.
  • a primary feature of the present invention is a linear actuator comprising: a housing having a primary piston chamber and a booster piston chamber; a piston rod disposed within the housing; a primary piston secured to one end of the piston rod and disposed within the primary piston chamber, the primary piston chamber having a first primary compartment and a second primary compartment disposed on opposite sides of the primary piston; a booster piston movably disposed about the piston rod and within the booster piston chamber, the booster piston chamber having a first booster compartment and a second booster compartment disposed on opposite sides of the booster piston; a thrust column attached to the booster piston and disposed between the booster piston and the piston rod; a first port capable of simultaneously supplying or draining fluid or air to or from the first primary compartment and the first booster compartment, wherein the first primary compartment and the first booster compartment are in contact via a fluid or air channel disposed between the thrust column and the piston rod; a second port capable of supplying and draining fluid or air to or from the second primary compartment; and a third port capable of supplying and draining fluid or air to or
  • Another feature is a method for increasing the initial thrust on a piston rod of a linear actuator comprising the steps of: supplying a fluid or air from a reservoir simultaneously into the first booster compartment and the first primary compartment by means of the first port and the channel; displacing the booster piston by supplying the fluid or air into the first booster compartment, while draining through the third port a proportionate quantity of the fluid or air from the second booster compartment; contacting the primary piston with an end of the thrust column due to the displacement of the booster piston; displacing the primary piston by applying the force generated from the contacting of the primary piston with the thrust column and supplying the fluid or air into the first primary compartment, while draining through the second port a proportionate quantity of the fluid or air from the second primary compartment.
  • the design of the present invention insures that a booster piston associated with a linear actuator is actuated such that its thrust is always applied to a primary piston during retraction of an associated piston rod.
  • the present inventor has developed a novel linear actuator which includes a booster piston which, although independent from the primary piston, is displaced by fluid or air which simultaneously acts on the primary piston.
  • the simultaneous thrusts either directly exerted upon the primary piston by the thrust column affixed to the booster piston or by the fluid or air transmitted to the primary piston increases the total thrust upon the associated piston rod by approximately 50-60% over conventional single piston devices.
  • This novel linear actuator increases the thrust during the initial movement of the piston rod within the first inch or so when the highest thrust, i.e., "break-out", is required in many linear applications, such as gate valves and sluice gates.
  • the increase of thrust is accomplished by putting a booster or auxiliary piston about the piston rod or, if desired, at the piston end. Additional thrust is obtained by supplying high pressure air or oil to the booster piston and primary piston simultaneously.
  • the booster piston has a thrust of 20 psi and the primary piston has a thrust of 30 psi, which generate a combined initial thrust of 50 psi.
  • the booster piston is independent of the primary piston and disposed about the piston rod.
  • a center thrust column affixed to the booster piston and disposed between the booster piston and the piston rod pushes against the bottom of the primary piston during the initial retraction of the piston rod.
  • the piston rod travels through the thrust column affixed to the booster piston in both directions and is separate from the booster piston.
  • booster piston During initial retraction of the piston rod, fluid or air is supplied to both the booster piston and the primary piston via the same port.
  • the fluid displaces the booster piston which causes the thrust column to push against the bottom of the primary piston. Therefore, an initial combined thrust caused by the pushing of the fluid and thrust column against the bottom of the primary piston acting in concert produce an increased initial thrust upon the piston rod.
  • the booster piston only operates for approximately 1-2 inches, although it may be designed to operate for any desired distance depending upon the particular requirements of the actuator.
  • Fig. 1 depicts a linear actuator 1 comprising: a housing 2 having a primary piston chamber 3 and a booster piston chamber 4.
  • a piston rod 5 is disposed within housing 2, wherein a primary piston 6 is secured to one end of piston rod 5 and disposed within primary piston chamber 3.
  • piston 5 is in a fully extended position within housing 2.
  • Primary piston chamber 3 includes a first primary compartment 7 and a second primary compartment 8 disposed on opposite sides of primary piston 6.
  • booster piston 9 is movably disposed about piston rod 5 and within booster piston chamber 4.
  • Booster piston chamber 4 includes a first booster compartment 10 and a second booster compartment 11 disposed on opposite sides of booster piston 9.
  • a thrust column 12 is attached to booster piston 9 and disposed between booster piston 9 and piston rod 5.
  • Linear actuator 1 also includes means for supplying and draining fluid or air to primary piston chamber 3 and booster piston chamber 4.
  • Such means include first port 13, second port 14 and third port 15.
  • First port 13 is capable of supplying or draining fluid to or from first primary compartment 7 and first booster compartment 10 concurrently, inasmuch as first primary compartment 7 and first booster compartment 10 are in fluid contact via an annular Channel 16 disposed between thrust column 12 and piston rod 5.
  • a second port 14 is capable of supplying and draining fluid to or from second primary compartment 8 and a third port 15 is capable of supplying and draining fluid to or from second booster compartment 11.
  • Intermediate plate or head 17 is disposed between primary piston chamber 3 and booster piston chamber 4, whereby intermediate plate 17 restricts both the vertical movement of primary piston 6 during extension of piston rod 5 and the vertical movement of booster piston 9 during retraction of piston rod 5.
  • Blind end plate or head 18 is disposed within housing 2 such that it restricts the vertical movement of primary piston 6 during retraction of piston rod 5.
  • Rod end plate or head 19 is disposed within housing 2 such that it restricts the vertical movement of booster piston 9 during extension of piston rod 5.
  • Third port 15 is disposed within intermediate plate 17, second port 14 within blind end plate 18 and first port 13 within rod end plate 19.
  • each piston includes piston seals 20. Furthermore, rod seals 21 are disposed on intermediate plate 17 and rod end plate 19 to provide a fluid seal within actuator 1.
  • a linear transducer 22 is provided to indicate the extent to which the main piston has moved upwardly (Fig. 2).
  • An LED forms part of transducer 22 which also comprises a magnet 23, within primary piston 6, whose movement relative to a conduit 24, which is held within a bore 25, formed in rod 5, causes generation of appropriate signals representative of distance traveled by piston 6. Such signals are applied to the LED to display the distance that piston 6, and therefore the gate valve, has moved.
  • Such arrangement of a transducer is advantageous in that it obviates the need for limit switches and the like, which are totally inadequate in that they will not stand up in use.
  • actuator 1 can best be described while referring to both Figs. 1 and 2, wherein Fig. 1 depicts piston 5 in a fully extended position (downward) and Fig. 2 depicts piston 5 in a fully retracted position.
  • fluid or air must be supplied from a reservoir 30 concurrently into first booster compartment 10 and first primary compartment 7 by means of pipe 31, first port 13, and channel 16.
  • Booster piston 9 is displaced by supplying the fluid or air into first booster compartment 10, while draining through third port 15 a proportionate quantity of fluid or air from second booster compartment 11. The drained fluid is returned to reservoir 30 via pipes 32 and 33. As booster piston 9 is displaced under fluid or air pressure it contacts the bottom of primary piston 6 with an end of thrust column 12.
  • Primary piston 6 is thereafter displaced by the application of the combined force generated from the contacting of primary piston 6 with thrust column 12 and the fluid or air pressure exerted by the supply of fluid or air into first primary compartment 7.
  • a proportionate quantity of fluid or air as that introduced into first primary compartment 7 is drained through second port 14 from second primary compartment 8.
  • the fluid drained from fluid second port 14 is returned to reservoir 30 via pipe 33.
  • the supply and drainage of the fluid or air is controlled by means of a pump 34 and a bidirectional valve 35.
  • first booster compartment 10 may also be drained by means of primary piston 6 pushing against thrust column 12 which in turn forces fluid from first booster compartment 10. In this instance, fluid would be supplied to second booster compartment 11 by means of the suction caused by the retraction of booster piston 9 within booster piston chamber 4.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
EP91306788A 1990-07-26 1991-07-25 Dispositif multiplicateur hydraulique pour vérin rectiligne Withdrawn EP0468788A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US55822890A 1990-07-26 1990-07-26
US558228 1990-07-26

Publications (1)

Publication Number Publication Date
EP0468788A1 true EP0468788A1 (fr) 1992-01-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91306788A Withdrawn EP0468788A1 (fr) 1990-07-26 1991-07-25 Dispositif multiplicateur hydraulique pour vérin rectiligne

Country Status (1)

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EP (1) EP0468788A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0678656A2 (fr) * 1994-04-19 1995-10-25 Cooper Cameron Corporation Obturateur anti-éruption à machoires
DE102014019574B3 (de) * 2014-12-23 2016-05-04 Samson Aktiengesellschaft Fluidbetriebener Antrieb
DE102015212753A1 (de) * 2015-07-08 2017-01-12 Gemü Gebr. Müller Apparatebau Gmbh & Co. Kommanditgesellschaft Ventilantrieb

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL108724C (fr) * 1900-01-01
FR1155231A (fr) * 1956-07-27 1958-04-24 Automatic Valve Ets Vérin hydraulique à pistons conjugés
US3018762A (en) * 1960-05-02 1962-01-30 Permanent Mold Die Co Inc Double piston arrangement
GB911709A (en) * 1960-04-25 1962-11-28 Automotive Prod Co Ltd Improvements in and relating to hydraulic cylinders
NL6701438A (fr) * 1967-01-30 1968-07-31
DE1905577A1 (de) * 1969-02-05 1970-08-20 Albrecht Automatik Gmbh 2-Stufenantrieb fuer Armaturen
DE2127181B2 (de) * 1971-06-01 1972-05-25 Union-Armaturen GmbH, 4630 Bochum Druckmittelantrieb fuer absperrschieber oder dgl. mit einem haupt- und einem hilfskolben
GB1432226A (en) * 1972-04-14 1976-04-14 Superfos Hydraulic As Fluid operated piston-cylinder actuator
DE3306846A1 (de) * 1983-02-26 1984-08-30 Niepenberg, Horst P., 4200 Oberhausen Antriebsvorrichtung zum bewegen eines absperrschiebers

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL108724C (fr) * 1900-01-01
FR1155231A (fr) * 1956-07-27 1958-04-24 Automatic Valve Ets Vérin hydraulique à pistons conjugés
GB911709A (en) * 1960-04-25 1962-11-28 Automotive Prod Co Ltd Improvements in and relating to hydraulic cylinders
US3018762A (en) * 1960-05-02 1962-01-30 Permanent Mold Die Co Inc Double piston arrangement
NL6701438A (fr) * 1967-01-30 1968-07-31
DE1905577A1 (de) * 1969-02-05 1970-08-20 Albrecht Automatik Gmbh 2-Stufenantrieb fuer Armaturen
DE2127181B2 (de) * 1971-06-01 1972-05-25 Union-Armaturen GmbH, 4630 Bochum Druckmittelantrieb fuer absperrschieber oder dgl. mit einem haupt- und einem hilfskolben
GB1432226A (en) * 1972-04-14 1976-04-14 Superfos Hydraulic As Fluid operated piston-cylinder actuator
DE3306846A1 (de) * 1983-02-26 1984-08-30 Niepenberg, Horst P., 4200 Oberhausen Antriebsvorrichtung zum bewegen eines absperrschiebers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0678656A2 (fr) * 1994-04-19 1995-10-25 Cooper Cameron Corporation Obturateur anti-éruption à machoires
EP0678656A3 (fr) * 1994-04-19 1996-09-25 Cooper Cameron Corp Obturateur anti-éruption à machoires.
DE102014019574B3 (de) * 2014-12-23 2016-05-04 Samson Aktiengesellschaft Fluidbetriebener Antrieb
US9903502B2 (en) 2014-12-23 2018-02-27 Samson Aktiengesellschaft Fluid-operated drive
DE102015212753A1 (de) * 2015-07-08 2017-01-12 Gemü Gebr. Müller Apparatebau Gmbh & Co. Kommanditgesellschaft Ventilantrieb

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