US2933069A - Control system for fluid operated mechanism - Google Patents

Control system for fluid operated mechanism Download PDF

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Publication number
US2933069A
US2933069A US620075A US62007556A US2933069A US 2933069 A US2933069 A US 2933069A US 620075 A US620075 A US 620075A US 62007556 A US62007556 A US 62007556A US 2933069 A US2933069 A US 2933069A
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circuit
speed
jack
movable contact
pressure
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US620075A
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Jean Louis Gratzmuller
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/34—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator hydraulic
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/022—Installations or systems with accumulators used as an emergency power source, e.g. in case of pump failure
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
    • 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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/025—Installations or systems with accumulators used for thermal compensation, e.g. to collect expanded fluid and to return it to the system as the system fluid cools down
    • 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
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor

Definitions

  • the invention relates to circuit-breaking and making apparatus hereafter called circuit-breakers whatever their specific nature. Still more particularly, the invention is concerned with control means for actuating the movable contact means of a circuit-breaker.
  • a circuit-breaker has to fulfill two main functions:
  • transient function namely switching-off or -on currents having different characteristics (for example, short-circuit currents, capacity currents, etc.) and doing so without mishap, either in the apparatus or in the mams.
  • circuit-breakers offer deficiencies preventing them from ensuring satisfactorily either their permanent or their transient function, or even both.
  • the transient function of a circuit-breaker implies stabilizing of the speed of its movable contact means at each point of its stroke, at a value comprised between two predetermined limit values which correspond to imperative electrical and mechanical conditions.
  • the same should be subjected to an initial acceleration as strong as possible so as to reduce to a minimum the total duration of the current cut-ofi? operation between the separation of the contacts and the complete extinguishment of the are.
  • the above mentioned minimum and maximum values are defined by the electrical and mechanical conditions to be fulfilled by the circuit-breaker.
  • Still another object of the invention is to design the hereabove mentioned braking means in such a manner that their action varies as a function of the speed of the movable contact means according to such a law that the said action becomes effective but only at a substantial speed so that it does not practically impair the said in itial acceleration.
  • a resilient power accumulator such as a spring, a compressed gas, etc.
  • the best known device using the elasticity of gases as a source of power is the oil-and-air accumulator.
  • Another object of the invention is to use, as a source of power for controlling a circuit-breaker in the manner described, an oil-and-air accumulator, preferably of the type described in the above cited prior application.
  • a further object of the invention is to provide a circuit breaker control device of the type described, wherein a displacement of the movable contact means causes a corresponding displacement of a hydraulic liquid. This latter displacement being obtained, for example, by providing a permanent kinematic interconnection between the said movable contact means and one or more hydraulic jacks.
  • the control of the circuit breaker namely, the braking means therefor is a calibrated permanently open restriction means formed by a sharp-edged orifice, so as to obtain a law of How in the conduit(s) approaching as nearly as possible the law of the square of the speed.
  • this sharp-edged orifice it may be defined as a circular orifice cut in a thin plate, which results in that the flow in the conduit(s) follows a law much nearly approaching the law of the square of the speed than to the law of the laminar flow.
  • the resilientr 3 V ly accumulated power provided to ensure the said stroke is transmitted to the said movable contact means through a liquid and a jack fed with the same under the control of a hydraulic valve.
  • a Well-knowndifficulty'of circuit'breaker control is to lock them in their circuit making position.
  • a specific object of the invention is to design the circuit breaker control device in the manner described in the US. patent application Ser. No. 479,620, filed January 3, 1955 in the name of the applicant.
  • the circuit-making stroke, as Well as the locking in circuit-making position of the movable contact means are effected. by means of a single-acting hydraulic jack fed with oil from an oil-and-air accumulator of the type described, while the circuit-breaking stroke is ensured by a spring armed during the circuitmaking stroke and released asthe oil contained in the said jack is evacuated at a' sufficiently high rate.
  • the said arrangement furthermore permits controlling the. speed of the movable contact means during both strokes of the sameby incorporating one or more calibrated permanently open restriction means formed by a sharp-edged orifice in the feeding and evacuation ducts.
  • Another advantage of the c'"cuit control device with hydraulic transmission is that of offering but a very small natural inertia. Therefore a control device of this type, capable of generating a superabundant force controlled by calibrated orifices determining a well defined stabilized speed with a high initial acceleration, may be easily designed at low cost. Such a control is capable, in turn, of determining a well defined stabilized speed of the movable contact means, whichever may be the nature of the electrical or mechanical phenomena resisting itsdisplacement.
  • control device permits establishing electric contacts under a pressure which may be given a heretofore never used order ofmagnitude and sinceit also permits both imparting to the movable contact means a very high initial acceleration and stabilizing its speed during its whole stroke, the said device offers a possibility of designing circuit breakers capable of fulfilling in an'entirely satisfactory manner the above defined permanent and transient function.
  • Still another object of the invention is to provide a circuit breaker equipped with'a control device of the type described and includingcontacts established under a pressure which maybe chosen if desired at a value having the same order of magnitude as the force available in the said device.
  • the two main types of contacts adapted to be used in a circuit breaker are the abutment contacts and thesliding contacts; the first ones offer many drawbacks and tend to be more and more abandoned in favor of the second ones;
  • Figure 1 is a diagrammatic view in longitudinal section
  • Figure 2 illustrates in a diagrammatic manner a first' embodiment of the hydraulic control device according to the invention, comprising a single-acting jack with circuit-breaking spring.
  • Figures 3 and 4 are detail views showing two different constructions of a calibrated sharp-edged orificeaccording to the invention.
  • Figure 5 is a modification of Figure 2 showing a modified arrangement of'the calibrated sharp-edged orifices.
  • Figure 6 is a longitudinal axial sectional view of an oiland-air accumulator of the type described in the above cited references, which may be used as a source of re silient power in the control device according to the invention.
  • Figure 7 is an axial sectional view of a spring hydraulic accumulator also adapted to be used as a source of resilient power.
  • Figure 8 is an elevational partly sectional view of the contact mechanism of a circuit-breaker according'to the invention.
  • Figure 9 is a part sectional view along line 99 of Fig. 8. a
  • Figure 10 shows a double-acting jack during a circuitbreaking stroke.
  • Figure 11 shows the same device during a circuitmaking stroke.
  • Figures 12, 13 and 14 illustrate. modified forms of con struction of the device in Figures 10 and 11.
  • Figure 15 shows anon-differential double-acting jack, supplied by two different sources of pressure.
  • Figure 16 hows a differential double-acting jack, one compartment of which is constantly in communication with a source of pressure.
  • Figure 17 is a modification of the form shown in Figure 2 in which only the circuit-making stroke of the circuitbreakeris controlled.
  • Figure 18 is a modification of the form shown in Figure 13 in which only the circuit-breakingstroke of the circuitbreaker is controlled.
  • Figure 1 shows by way. of example, which is,,of course,
  • a single-pole circuit-breaker which can be controlled by a device according to the invention.
  • This circuit-breaker comprises essentially, a movable contact 1- sliding in a contact sleeveZ connected to one of the conductors 3 of the circuit to be broken.
  • the movable contact 1 In the circuitmaking position illustrated, the movable contact 1 isengaged in a tulip-shaped fixed contact 4, electrically connected to the other conductor 5 of the. said circuit.
  • the movable contact Ir is rigidly connected to a control rod 6 by means of an insulating member 97.
  • the. movable contact 1 and the insulating member 97 are immersed in oil as indicated at 98 and 99 respectively.
  • the control of the rod 6 is effected by a single-acting jack, the cylinder of which is seen at '7 and the piston at 8, connected to the rod 6 by its rod 9.
  • a spring adapted, to effect the circuit-breaking stroke as oil is evacuated from the jack 7, while the subjection to pressure of said jack etiects the circuit-making operation.
  • the hydraulic circuit in Figure 2 comprises a resilient accumulator of hydraulic power 11 fed by a pump 12 from a reservoir, with liquid such as the oil 13.
  • the accumulator l1 feeds the jack 7 by means of pipes M, 15 and 16, under the control of a valve 17 of a set of valves 18.
  • the evacuation of the oil from jack 7, takes place through the pipes 16, 19 and 20 under the control of the valve 21 in the set of valves 18. Still for the sake of simplification, it is assumed that the valves 17 and 21 are controlled by simple push-buttons 22 and 23 respectively.
  • a calibrated permanently open restriction means formed by a sharp-edged orifice 24 is interposed in the path of the liquid under pressure feeding the jack '7 and a second calibrated permanently open restriction means formed by another sharp-edged orifice 25 is interposed in the evacuation path of the liquid coming from the jack 7.
  • the orifices 24 and 25 are illustrated diagrammatically in Figure 2 in the form of simple apertures pierced in diaphragms inserted, in the example illustrated, in the pipes 15 and 19.
  • the calibrated sharp-edged orifices have been shown in the shape of a gap in a single solid line.
  • each of the orifices may consist of a passage such as 26 ( Figure 3) drilled in a member 27 interposed in the path of the liquid to be controlled.
  • the power of the speed of the movable contact means in function of which the intensity of the braking action exerted by the calibrated sharp-edged orifice varies, increases as the ratio between the length and the cross section of the passage decreases; the said power tends to become equal to 2 as the said ratio tends towards 0.
  • each orifice such as 28 may be drilled in a detachable diaphragm 29 which may, for example, be held by means of screw-bolts 32, between flanges 30 and 31 of two lengths of pipe joined together by the said flanges.
  • This last arrangement is particularly advantageous and permits designing a sharp-edged orifice ensuring a braking intensity practically proportional to the square of the speed of the movable contact.
  • the sharp-edged orifice corresponding to Formula 6 is particularly advantageous since it permits a greater initial acceleration than when the speed is controlled by means of a long passage.
  • pc is the loss or" pressure corresponding to the stabilized speed
  • the Formula 5 will give a loss of pressure equal to /3 of 20, according to Formula 7:
  • the control device is equipped with an air-and-oil accumulator of the type described in the above cited references, having a maximum pressure of about 4,300 p.s.i. and a minimum pressure of about 2,800 p.s.i.
  • the strength of the circuit-breaking spring when fully com pressed is about 1,100 lbs.
  • the single connecting jack has a cross section of about .9 sq. in. and a stroke (equal to that of the movable con- 7 feeding of the jack and, hence, the circuit-making speed has a diameter of about
  • the calibrated orifice controlling the delivery of the jack and hence the circuitbreaking speed has a diameterof about
  • the length of both calibrated orifices is about
  • the movable contact rod has a diameter of about 1 and its weight is about 7 kgs.
  • Themoving parts of the jack weigh about 10 lbs. and the spring has an equivalent mass of about 5 lbs., which gives an overall weight of the moving assembly of about 22 lbs.
  • the structure of the control jack is identical with that in Figure 2, but a slightly diflerent arrangementis adopted for the hydraulic circuit enabling the calibrated orifices to be interposed in the immediate vicinity of the jack 7.
  • two non-return valves 3d are provided, interposed in two branches from the said single pipe 33, namely 36 and 37, in which branch pipes the constriction means are likewise interposed, being designated respectively by the reference numerals 3% and 39.
  • the jack 7 is connected to the two branch pipes 36 and 37, likewise by means of a single pipe 33a.
  • the calibrated aperture 38 exclusively controls the drainage delivery
  • the calibrated aperture 39 exclusively controls the supply delivery.
  • the air-and-oil accumulator shown in Figure 6 is provided with three special packing devices, as follows:
  • the piston of the accumulator comprises a packing ring 103 made of plastic material and mounted in an annular groove 104 of the lower face 105 of the piston.
  • This packing ring is continuously subjected through a pressing member 101 to'the action of a spring 102 bearing on the upper face 106 of the piston and that compresses it axially.
  • the air compartment as described in the second reference hereabove cited, is kept tight by means of a cylinder head 107 freely fitted at the air side extremity of the cylinder 108 and which is prevented from escaping by means of a nut 109, a packing ring 110 made of plastic material being interposed between the nut 10% and the cylinder head 107. Under these conditions, the head 107 is pressed against the packing ring 110 with a pressure that increases as the air pressure in the accumulator increases.
  • This oil-and-air accumulator maybe used as a source of resilient power for actuating the movable contact
  • Another example of a source of resilient power is
  • the spring hydraulic accumulator essentially comprises a cylindrical casing 114 provided with a long axial hollow embossment 115, which acts as a cylinder for a plunger 116 having a packing terminal pad 117.
  • a compression spring 118 compresses the oil contained in the compartment 119 of the cylinder through a flanged sleeve 120 and the piston 116 on which the said sleeve bears.
  • the spring 118 bears at one end on the flange 120a of the sleeve 120 and at its other end on the head 121 of the cylindrical casing :114.
  • FIGs 8 and 9 is shown a circuit-breaker according to the invention of the general type of Figure l.
  • circuit-breaker shown in Figures 8 and 9 differs from all known circuit-breakers by the quality of its electrical contacts obtainable only by the use of the control device with hydraulic transmission according to the invention.
  • the tulip-shaped stationary contact generally designated by 4 and the connecting sleeve generally shown at 2, in which the movable contact rod 1 is slidably mounted are both constituted by a plurality of members 122 having the general shape of shoes hearing against the cylindrical wall periphery of the said rod around which they are suitably distributed.
  • Each member 122 is urged towards the axis of the rod 1 by a strong compression spring 123 having a high elasticity.
  • each member 122 is pressed on the rod 1 with a predetermined force; now, when'two metal surfaces are pressed against each other with a predetermined force, the deformation of both contact surfaces produces a metal-to-metal contact area that depends only on the nature of the metals and the contact pressure. If the latter is sufficient there will be obtained a metal-to-metal contact area suflicient to ensure without excessive heat the passage of the strong electrical current flowing through the line.
  • FIGS 10 and 11 illustrate another embodimentin which the hydraulic control device comprises a doubleacting jack 40, the piston 41 of which is connected directly to the rod 6, which is rigidly connected to the movable contact to be controlled.
  • each of the compartments 42 and 43 of the jack 40 may either be brought into communication with a source of liquid under pressure, not illustrated in this figure, or set to exhaust, the supply to and the drainage from each of the said compartments being effected through a single pipe, namely 44a, 44b, for the compartment 43, and 45a, 45b for the compartment 42, under the control of a set of valves 46 selectively eitecting either the bringing of one pipe 47, connected to the source, into communication nectcd to exhaust, into communication with the pipe 45a Precisely, the specific control ( Figure 10), or, on the other hand, the simultaneous establishment of communication between the pipes 47 and 45a on the one hand, and 48 and 44a on the other hand ( Figure 11).
  • the control of the set of valves 46 is illustrated, still by way of simplification, in the form of two push-buttons, respectively 49 and 50, the depression of the push-button 49 effecting the establishment of the communication described above, illustrated in Figure 10, and determining the circuit-breaking stroke of the circuit-breaker, while the depression of the bush-button 50 determines the establishment of the communications described above, illustrated in Figure 11 and determining the circuit-making stroke of the circuit-breaker.
  • the calibrated orifices 51 and 52 are respectively provided in the non-return valves 53 and 54, the direction of action of said non-return valves being selected in such a manner that the calibrated apertures 51 and 52 only control the drainage from the compartments 43 and 42 respectively.
  • Figure 12 illustrates a modified form of construction of the device which has just been described with reference to Figures 10 and 11, and only differs therefrom in the direction of action of the non-return valves 53 and 54, this direction being chosen in such a manner that the calibrated orifices 51 and 52 only control the supply delivery to the compartments 43 and 42 respectively.
  • Figure 13 illustrates another modification of the device in Figures 10 to 12, in which only the compartment 42 of the double-acting jack is controlled.
  • this control affects both the supply delivery to said compartment by means of a calibrated orifice 55, and the drainage delivery from the said compartment by means of a calibrated orifice 56.
  • Non-return valves, 57 and 58 respectively, are provided to prevent the supply delivery from passing through the orifice 56 and the drainage delivery from passing through the orifice 55.
  • Figure 14 illustrates an inverted arrangement of Fig ure 13, that is to say in which only the compartment 43 of the jack is controlled, the control applying, in this example again, both to the supply and to the drainage.
  • the device comprises a doubleacting jack 59, which is non-difierential, that is to say in which the piston 60 is provided with two opposed rods 61, 62 which are of the same cylindrical section, the rod 61 being assumed to be connected to the rod 6 of the circuit-breaker in Figure 1, for example.
  • One of the compartments, 63, of the said jack is permanently connected to a first source of liquid under pressure, consisting, in the example illustrated, of an hydraulic accumulator 64.
  • the other compartment, 65 of the jack 59 is controlled, in the same manner as in Figure 13, by two calibrated orifices 55 and 56, the action of which is selected by nonreturn valves 57 and 58 respectively.
  • the supply to or the drainage from the jack 65 are eifected under the control of a set of valves'66 supplied from a second source of liquid under pressure consisting, for example, of a hydraulic accumulator 67 fed by a pump 68 from a reservoir 69.
  • the control jack 70 is differential, that is to say it comprises a cylindrical compartment 71 and an annular compartment 72, the latter being permanently in communication, through pipes 73, 74 and 75, with a source of liquid under pressure consisting of a hydraulic accumulator 76 fed by a pump 77 from a reservoir 73.
  • the cylindrical compartment 71 of the jack 79 may be brought into communication either with the accumulator 76, or with the reservoir 78, under the control of a set of valves 79.
  • two calibrated orifices 8t) and 81 control respectively and exclusively, as a result of the presence of non-return valves, 82 and 83 respectively, the former the drainage of the compartment 71 and the latter the supply to the said compartment.
  • Figure 17 illustrates a control device identical with that in Figure 2 except that it only comprises one calibrated orifice 24 controlling the. supply to the compart ment 87 of the jack 7.
  • Figure 18 illustrates a device identical with that in Figure 13, except that only the drainage from the compartment 42 is controlled by an orifice 56, a non-return valve 58 forcing the drainage delivery to pass through the calibrated orifice 56 while it allows the supply delivery to pass freely through a pipe 84 bypassing the calibrated orifice 56.
  • control may be applied indiscriminately either to the supply to or to the discharge from a jack, for either stroke of the movable contact of a circuit-breaker, nevertheless, in certain cases, it is a greater advantage to control the circuit-breaking stroke by inserting the calibrated orifices according to the invention in the evacuation system of the jack to enable the said orifices to play their stabilizing part even in the presence of parasitic forces acting in the direction of the circuit-breaking stroke.
  • a liquid pressure motor operably coupled with said member for moving the same in at least one of said two directions, a source of liquid under pressure, conduit means in communication between said source and motor for conducting liquid under pressure thereto, control valve means in said conduit means operable when open to permit liquid under pressure to flow from source to said motor to initiate movement of said member in said at least one direction, said source being under a constantly available pressure far in excess of that required to move said member at a speed higher than the optimum speed desired, and a calibrated permanently open restriction means formed by a sharp-edged orifice constituting a speed limiting orifice disposed in said conduit means between said control valve and said motor and operable to establish flow characteristics in the conduit means to apply a braking effect on said member that increases at a rate which is higher than the rate of increase of the speed of movement of the liquid in the conduit means without adversely limiting the initial acceleration of the member.
  • a piston and cylinder means In combination with a movable member adapted to be moved in opposite directions relative to a desired position, a piston and cylinder means, one of said means being permanently kinematically connected to said member, a source of liquid under a constantly available pressure, force applying means for normally urging said memher to move in one of said two directions at a speed higher than the optimum speed desired, a tank, valve controlled conduit means operable when open to respectively provide communication between said source and said cylinder, or between said cylinder and said tank, whereby flow of liquid under pressure from said source to said cylinder etfects movement of said member in the other of said two directions, said source being under such pres sure as to be capable of moving said member at a speed higher than the optimum speed desired, and when said tank is in communication with said cylinder said force applying means effecting movement of said member in said one direction, said member being normally retained in said desired position by pressure of liquid in said cylinder, and in each of said conduit means a calibrated permanently open restriction means formed by a sharp
  • a piston and cylinder means In combination with a movable member adapted to be moved inopposite directions relative to a desired position, a piston and cylinder means, one or" said means being permanently kinematically connected to said member, a source of liquid under a constantly available pressure, force applying means for normally urging said member to move in one of said two'directions at a speed higher than the optimumspeed desired, a tank, conduit means including portions operable when open to respectively provide communication between said source and at least one end of said cylinder, or between said end of said cylinder and said tank, whereby flow of liquid under pressure from said source to said one end of the cylinder eifects movement of said member in the other of said two directions, valve means controlling said conduit means, said source being under such pressure as to be capable of moving said member at a speed higher than the optimum speed desired, and when said tank is in communication with said cylinder said force applying means eitecting movement of said member in said one direction, said member being normally retained in said desired position by pressure of liquid in said
  • a piston and cylinder means In combination with a movable member adapted to be moved in opposite directions relative to a desired position, a piston and cylinder means, one of said means being permanently kinematically connected to said mem ber, a source of liquid under a constantly available pressure, force applying means for normally urging said member to move in one of said two directions at a speed higher than the optimum speed desired, a tank, conduit 12 a means including portions operable when open to respectively provide communication between said source and at least one end of said cylinder, or between said end ofsaid cylinder andsaid tank, whereby flow of liquid under pressure from said source to said one end of the cylinder effects movement of said member in the other of said two directions, manually operable valve means controlling said conduit means, said source being under such pressure as to be capable of moving said member at a speed higher than the optimum speed desired, and when said tank is in communication with said cylinder said force applying means efiecting movement of said memher in said one direction, said member being normally retained in said desired position by pressure

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Circuit Breakers (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Actuator (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Percussive Tools And Related Accessories (AREA)
US620075A 1955-11-04 1956-11-02 Control system for fluid operated mechanism Expired - Lifetime US2933069A (en)

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US (1) US2933069A (fr)
CH (1) CH355199A (fr)
DE (1) DE1152469B (fr)
FR (1) FR1135122A (fr)
GB (1) GB840977A (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136226A (en) * 1959-03-06 1964-06-09 Gratzmuller Jean Louis Control system for hydraulic actuators
US3208220A (en) * 1962-12-04 1965-09-28 Comp Generale Electricite Circuit breaker control
US3419030A (en) * 1964-11-20 1968-12-31 Gratzmuller Jean Louis Fast evacuation valve
DE1750740A1 (de) * 1968-05-31 1971-03-25 Siemens Ag Hydraulikspeicher
US3984648A (en) * 1972-09-14 1976-10-05 Hitachi, Ltd. Circuit breaker actuating device
US4077303A (en) * 1976-04-14 1978-03-07 Peder Ulrik Poulsen Apparatus for generating an impact force
US4204461A (en) * 1978-01-04 1980-05-27 Gratzmueller C A Hydraulic control system for electric circuit-breakers
US4456205A (en) * 1979-08-09 1984-06-26 Aerazur Efa Aircraft arresting gear net raising device
US4729224A (en) * 1984-06-04 1988-03-08 Mcateer James D Installation, apparatus and method for actuating doors, gates and the like under extreme environmental conditions
WO2013182291A1 (fr) * 2012-06-05 2013-12-12 Abb Technology Ag Vérin pour entraînement d'un interrupteur de puissance électrique
CN104595174A (zh) * 2014-12-01 2015-05-06 柳州市桥厦工程管材有限公司 一种灰浆泵上的稳压装置
CN103925208B (zh) * 2014-03-31 2016-04-06 山东大学 室内注浆模型试验用稳压注浆泵及其安装和使用方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3150245A (en) * 1957-09-13 1964-09-22 Westinghouse Electric Corp Liquefied gas circuit interrupters
NL276875A (fr) * 1961-04-06
FR2115506A5 (fr) * 1970-11-23 1972-07-07 Gratzmuller Jean Louis
DE3941241C2 (de) * 1989-12-14 2002-03-21 Continental Teves Ag & Co Ohg Kolbendruckspeicher, insbesondere für antriebsschlupfgeregelte Bremsanlagen, sowie Schaltanordnung dazu
CH684969A5 (fr) * 1991-09-06 1995-02-15 Secheron Sa Dispositif de commande actionné par un fluide sous pression notamment pour la fermeture et l'ouverture des contacts d'un disjoncteur.

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US674858A (en) * 1900-04-26 1901-05-28 Donald Grant Contact for controllers or reversing-switches.
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US2275872A (en) * 1939-06-27 1942-03-10 Gen Electric Gas blast electric circuit breaker
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US2523572A (en) * 1944-03-18 1950-09-26 Allis Chalmers Mfg Co Control for a plurality of fluid pressure motors
US2533559A (en) * 1949-01-18 1950-12-12 Allis Chalmers Mfg Co Pneumatic interlocking device for preventing improper closing of a circuit breaker
US2548221A (en) * 1949-02-15 1951-04-10 Allis Chalmers Mfg Co Fluid pressure actuated switch
US2669628A (en) * 1950-01-05 1954-02-16 Westinghouse Electric Corp Liquid break circuit interrupter
FR1056143A (fr) * 1950-12-20 1954-02-24 Bendix Aviat Corp Dispositif hydraulique de commande
FR1098565A (fr) * 1954-01-15 1955-08-08 Dispositif de commande hydraulique pour disjoncteur, ou analogue
US2736295A (en) * 1953-01-23 1956-02-28 Allis Chalmers Mfg Co Circuit breaker with fluid motor having fluid admission varied during stroke

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US1037039A (en) * 1912-08-27 Westinghouse Air Brake Co Electric-pump governor.
US674858A (en) * 1900-04-26 1901-05-28 Donald Grant Contact for controllers or reversing-switches.
US853785A (en) * 1905-08-29 1907-05-14 George J Henry Jr Safety means for fluid-pressure lines.
US1993195A (en) * 1932-11-15 1935-03-05 Cash A W Co Valve mechanism
US2127501A (en) * 1935-12-28 1938-08-23 Leeds And Northurp Company Fluid flow measuring means
US2275872A (en) * 1939-06-27 1942-03-10 Gen Electric Gas blast electric circuit breaker
DE726789C (de) * 1941-04-29 1942-10-26 Bbc Brown Boveri & Cie Doppeltwirkender Druckluftantrieb zur Betaetigung elektrischer Schalter
US2523572A (en) * 1944-03-18 1950-09-26 Allis Chalmers Mfg Co Control for a plurality of fluid pressure motors
US2533559A (en) * 1949-01-18 1950-12-12 Allis Chalmers Mfg Co Pneumatic interlocking device for preventing improper closing of a circuit breaker
US2548221A (en) * 1949-02-15 1951-04-10 Allis Chalmers Mfg Co Fluid pressure actuated switch
US2669628A (en) * 1950-01-05 1954-02-16 Westinghouse Electric Corp Liquid break circuit interrupter
FR1056143A (fr) * 1950-12-20 1954-02-24 Bendix Aviat Corp Dispositif hydraulique de commande
US2736295A (en) * 1953-01-23 1956-02-28 Allis Chalmers Mfg Co Circuit breaker with fluid motor having fluid admission varied during stroke
FR1098565A (fr) * 1954-01-15 1955-08-08 Dispositif de commande hydraulique pour disjoncteur, ou analogue

Cited By (16)

* Cited by examiner, † Cited by third party
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US3136226A (en) * 1959-03-06 1964-06-09 Gratzmuller Jean Louis Control system for hydraulic actuators
US3208220A (en) * 1962-12-04 1965-09-28 Comp Generale Electricite Circuit breaker control
US3419030A (en) * 1964-11-20 1968-12-31 Gratzmuller Jean Louis Fast evacuation valve
DE1750740A1 (de) * 1968-05-31 1971-03-25 Siemens Ag Hydraulikspeicher
US3984648A (en) * 1972-09-14 1976-10-05 Hitachi, Ltd. Circuit breaker actuating device
US4077303A (en) * 1976-04-14 1978-03-07 Peder Ulrik Poulsen Apparatus for generating an impact force
US4204461A (en) * 1978-01-04 1980-05-27 Gratzmueller C A Hydraulic control system for electric circuit-breakers
US4456205A (en) * 1979-08-09 1984-06-26 Aerazur Efa Aircraft arresting gear net raising device
US4729224A (en) * 1984-06-04 1988-03-08 Mcateer James D Installation, apparatus and method for actuating doors, gates and the like under extreme environmental conditions
WO2013182291A1 (fr) * 2012-06-05 2013-12-12 Abb Technology Ag Vérin pour entraînement d'un interrupteur de puissance électrique
CN104364866A (zh) * 2012-06-05 2015-02-18 Abb技术有限公司 用于电气功率开关的驱动器的工作缸
CN104364866B (zh) * 2012-06-05 2017-03-08 Abb 技术有限公司 用于电气功率开关的驱动器的工作缸
RU2615745C1 (ru) * 2012-06-05 2017-04-11 Абб Текнолоджи Аг Рабочий цилиндр для привода автоматического выключателя
US9837222B2 (en) 2012-06-05 2017-12-05 Abb Schweiz Ag Working cylinder for a drive of an electric circuit breaker
CN103925208B (zh) * 2014-03-31 2016-04-06 山东大学 室内注浆模型试验用稳压注浆泵及其安装和使用方法
CN104595174A (zh) * 2014-12-01 2015-05-06 柳州市桥厦工程管材有限公司 一种灰浆泵上的稳压装置

Also Published As

Publication number Publication date
CH355199A (fr) 1961-06-30
GB840977A (en) 1960-07-13
DE1152469B (de) 1963-08-08
FR1135122A (fr) 1957-04-24

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