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WO2018137014A1 - Système hydraulique ou pneumatique - Google Patents

Système hydraulique ou pneumatique Download PDF

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Publication number
WO2018137014A1
WO2018137014A1 PCT/BR2018/050018 BR2018050018W WO2018137014A1 WO 2018137014 A1 WO2018137014 A1 WO 2018137014A1 BR 2018050018 W BR2018050018 W BR 2018050018W WO 2018137014 A1 WO2018137014 A1 WO 2018137014A1
Authority
WO
WIPO (PCT)
Prior art keywords
actuator
fluid
power
auxiliary
main
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.)
Ceased
Application number
PCT/BR2018/050018
Other languages
English (en)
Portuguese (pt)
Inventor
Mário José Tavares CHICA
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.)
Caramona Empreendimentos E Participacoes Ltda
Original Assignee
Caramona Empreendimentos E Participacoes Ltda
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
Priority claimed from BR102017001760-5A external-priority patent/BR102017001760B1/pt
Application filed by Caramona Empreendimentos E Participacoes Ltda filed Critical Caramona Empreendimentos E Participacoes Ltda
Publication of WO2018137014A1 publication Critical patent/WO2018137014A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • 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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/22—Synchronisation of the movement of two or more servomotors

Definitions

  • the present invention relates to a hydraulic and / or pneumatic system with straight or rotary hydraulic and / or pneumatic actuators of the type employing an injected fluid for mechanical power generation where the system is capable of generating a power output. slim! much higher than the power used in the injection of the fluid,
  • Straight or rotary hydraulic actuators convert fluidic energy to mechanical energy, using fluidic properties to generate motion.
  • Both hydraulic actuators and pneumatic actuators are systems based on fluid mechanics, where power generation and transmission depends on fluid injection.
  • Pneumatic actuators employ non-viscous fluid (usually compressed air.), While hydraulic actuators employ viscous liquid fluids such as oils, water-based fluids and synthetic fluids.
  • the fluidic supply to the actuators is performed through an initial generator system and a distribution system.
  • this initial generator system is usually composed of actuator and pump, which withdraws fluid from the reservoir, and the distribution system is generally composed of piping and valves for control of fluid direction, flow and pressure.
  • the system responsible for converting fluidic (hydraulic / pneumatic) energy into mechanical energy is generally referred to as an actuator system.
  • a major drawback of the known hydraulic and pneumatic actuators is directly related to said fluidic force injector system and the way this fluid circulates within the actuator chambers to produce mechanical motion.
  • Some hydraulic systems are known in the art which include two hydraulic actuators to handle different load demands.
  • US 4,769,991 discloses a balanced hydraulic propulsion system comprising two hydraulic actuators powered by a single source of pressurized fluid. Each hydraulic actuator has at least two trim valves. A small fluidic communication line is provided between the valves to equalize fluid pressure and thus prevent dominance of one valve over another.
  • US 7,836,993 discloses a hydraulic circuit capacity selection device comprising two hydraulic actuators which drive a vehicle's moving means opposite each other.
  • the circuit comprises first, second, third and fourth main ducts that feed the actuators in parallel.
  • the selector is configured to assume a position where power is performed in parallel by the connection between duct pairs and a position where one of the actuators is idle by connecting one of the ducts in one pair to a duct in the other pair.
  • Another object of the present invention is a hydraulic or pneumatic system of the type employing fluidic injection for power generation. mechanics, where the nominal volumetric amount of fluid in the high pressure chamber is controlled for filling, regardless of the fluid volume coming from the fluid injection means.
  • the present invention achieves these and other objects by means of a hydraulic or pneumatic system of the type employing a pressurized fluid for mechanical power generation comprising a main actuator which moves a produced power transmission shaft and a auxiliary actuator that connects to the main actuator through a fluidic communication chamber.
  • the auxiliary actuator is mechanically connected to the main actuator by means of a motion transmission means.
  • the main actuator and auxiliary actuator are in opposite configuration.
  • the system further comprises a power and injection unit comprising a fluid source for the system; wherein the force and injection unit is fluidly connected to the fluidic communication chamber by a high pressure line.
  • a feedback line connects the main actuator to the auxiliary actuator.
  • the auxiliary actuator acts to maintain a controlled volume of pressurized circulating fluid in the fluid communication chamber.
  • the geometrical volume of the high pressure fluid in the main actuator can be constantly kept fully or partially filled regardless of the fluid flow injected by the force and injection unit.
  • the motion transmission means is a pulley and belt assembly.
  • the mechanical connection between the auxiliary actuator and the main actuator could be made otherwise.
  • the power and injection unit may comprise a fluid reservoir, a fluid pump, which is in fluid communication with the reservoir and with the high pressure line, a pump drive means, and relief and pressure control valves, all in fluid communication with the high pressure line.
  • the power and injection unit may comprise a hydraulic pressure source and pressure relief and control valves in fluid communication with the high pressure line.
  • the power and injection unit comprises a driving means driving the main actuator, the main actuator being in fluid communication with a fluid reservoir.
  • the high pressure line may comprise pressure relief and control valve and / or pressure relief valve when using pressure accumulators
  • the feedback line may comprise a heat exchanger and a fluid filter.
  • Figure 1 is a schematic representation of the hydraulic circuit according to a first simplified embodiment of the system according to the present invention
  • Figure 2 is a schematic representation of the hydraulic circuit according to a second simplified embodiment of the system according to the present invention.
  • Figure 3 is a schematic representation of the hydraulic circuit according to a third simplified embodiment of the system according to the present invention.
  • Figure 4 is a schematic representation of the hydraulic circuit according to a fourth simplified embodiment of the system according to the present invention.
  • Figure 5 is a schematic representation of the hydraulic circuit according to a fifth simplified embodiment of the system according to the present invention.
  • Figure 6 is a schematic representation of the hydraulic circuit according to a simplified sixth embodiment of the system according to the present invention
  • Figure 7 is a schematic, also simplified, representation of the hydraulic circuit according to a seventh embodiment of the system according to the present invention.
  • Figure 1 illustrates a hydraulic circuit according to a first embodiment of the system according to the present invention.
  • the system comprises a main actuator 1 whose output shaft is primarily responsible for the power transmission of system 2.
  • the main actuator 1 is mechanically and fluidly interconnected to an auxiliary actuator 3 so as to have a mechanical gain on the main actuator 1.
  • the main and auxiliary actuators are in a opposite relationship, that is, the actuators rotate in opposite directions to each other.
  • Mechanical connection 14 between main actuators 1 and auxiliary 3 may be accomplished by means of a belt and pulley assembly or similar mechanical motion transmission element, while fluidic connection is by means of a line or chamber. of fluidic communication 4.
  • the main rotary actuator 1 is an axial piston hydraulic motor, however, the main actuator could be of any type of hydraulic or pneumatic actuator.
  • auxiliary actuator could be of any type of hydraulic or pneumatic actuator.
  • a high pressure line 5, fed by the fluid injection and force system, is fluidly connected to the fluidic communication chamber 4 formed between the main 1 and auxiliary 3 feeders.
  • the auxiliary actuator 3 acts to maintain a controlled volume of pressurized fluid in the fluid communication chamber 4.
  • the geometrical volume of the high pressure fluid in the main actuator can be constantly kept fully or partially filled regardless of the fluidic flow. injected by the power and injection unit.
  • the fluid injection and force unit comprises a fluid reservoir 6, a fluid pump 7, which is in fluid communication with the reservoir 6 and the high pressure chamber 4, a means of pump drive 8 and a relief and pressure control valve 9 which is in fluid communication with the high pressure line.
  • a pressure gauge 11 may be used to indicate the pressure in the high pressure line, and the pressure relief and control valve 3 may be used to control the pressure in the line.
  • the pump drive means 8 may be, for example, an electric motor. Of course, other drive means could be used within the context of the present invention.
  • the low pressure fluid exits the main actuator 1 on the feedback line 10 and the low pressure fluid flows to the auxiliary actuator 3.
  • Feedback (return circulation) line 10 may include a heat exchanger 12 to prevent system overheating, actuator drain lines 20, and a filter 13 to remove possible impurities in the fluid.
  • Figure 2 shows a second embodiment of the system of the present invention.
  • the mechanically and fluidically connected main actuators 1 and auxiliary 3 and the power and injection unit formed by an electric motor 8, a pump 7 and a reservoir 6.
  • the pressure relief and control valve 9 is associated with a pressure accumulator 15, thereby forming a valve.
  • pressure switch which aims, among others, to stabilize the pressure in the system to a preset value.
  • system bottom line (return circulation) 10 may further include a valve 16 that controls the flow to tank 6. It should be noted that valve 16 is an optional element of the system of the present invention and may be included in all embodiments.
  • the high pressure line 5 is fed by the power and injection unit, which in that embodiment comprises a pump assembly 7 and an electric motor 8, and is in fluid communication with the power line.
  • the power and injection unit which in that embodiment comprises a pump assembly 7 and an electric motor 8, and is in fluid communication with the power line.
  • the pressure relief valve communicates fluidly with the high pressure line 5 so as to stabilize the pressure in the system if necessary.
  • FIG 3 schematically illustrates another simplified embodiment of the system of the present invention, similar to the embodiment illustrated in Figure 2, but without the optional valve 16 and the pressure accumulator 15.
  • Figure 4 shows a fourth simplified embodiment of the system of the present invention.
  • the main 1 and auxiliary 3, mechanically 14 and fluidically connected 4 actuators, and the fluidic injection and force unit formed by an electric motor 8, a pump 7 and a reservoir 6 are also present.
  • the system of this embodiment also comprises pressure relief and control valve 9 on high pressure line 5.
  • fluid enters the system through the fluid injection and power unit.
  • valve 9 is actuated and fluid returns to reservoir 6.
  • Reservoirs 6 and 18 may be separate or single reservoirs. In this sense, as shown in the figure, the reservoirs may be fixed higher than the actuator installation height;
  • Figure 5 shows a fifth simplified embodiment of the system of the present invention.
  • the mechanically and fluidically connected main actuators 1 and auxiliary 3 are also present, but the fluid injection force unit is a source of hydraulic pressure 19 not necessarily formed by an actuator / pump assembly.
  • a pressure control and relief valve 9 may be used for relief of excessive pressure on the high line.
  • Figures 6 and 7 show embodiments of the present invention where the main actuator 1 is directly driven by any driving means 20 so as to maintain the fluidic connection in the high pressure chamber 4 between the main actuator 1 and the auxiliary actuator. 3.
  • Actuator 1 which is being directly actuated, behaves constructively as a unit of power and fluid injection.
  • the system comprises a relief and pressure control valve 9 may be used for relief of excessive pressure on the high line and, in the embodiment of FIG. 7, the relief valve and Pressure control is accompanied by a pressure accumulator 15 to configure a pressure relief valve when it is desired to stabilize the system at a given pressure.
  • the main and auxiliary actuators comprise two 118.6 cm 3 hydraulic motors which are in opposite configuration. That is, the engines when under pressure, rotate in opposite directions.
  • the output shafts of the motors are connected by mechanical transmission in a 2: 1 mechanical ratio.
  • the fluid injection and power unit utilizes a 4cm 3 / rev pump with a 2CV electric motor at 1740rpm.
  • the main actuator and auxiliary actuator are connected by a fluidic chamber approximately 105 mm in length and 16 mm in diameter.
  • a volumetric spacing is generated at the wiring of actuators 1 and 2, which are arranged in reverse.
  • the system tends to seek a volumetric balance between what is injected into the system and what can be absorbed by this volumetric spacing (fluidic chamber between actuators 1 and 2).
  • the data collected from the operation of the system described in example 1 show that the volumetric spacing between two hydraulic motors of 118.6 cm3 per revolution, in a mechanical ratio of 2: 1, is larger than the fluidic injection from the unit. of hydraulic force which is 4 cm 3 per revolution using a 2 hp electric motor at 1740 rpm with a relief valve at 100 Bar.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

La présente invention concerne un système hydraulique ou pneumatique du type faisant intervenir un fluide sous pression pour la production d'énergie mécanique, le système étant capable de produire une puissance finale nettement supérieure à sa puissance d'actionnement. Le système comprend un actionneur principal (1) qui déplace un axe de transmission de puissance produite (2), un actionneur auxiliaire (3) raccordé à l'actionneur principal par l'intermédiaire d'une chambre de communication fluidique (4), l'actionneur auxiliaire (3) étant relié mécaniquement à l'actionneur principal (1) par un moyen de transmission de mouvement (14), une unité génératrice et d'injection comprenant une source de fluide pour le système, l'unité génératrice et d'injection étant raccordée fluidiquement à la chambre de communication fluidique (4) par un conduit haute pression (5), et un conduit de réalimentation (10) raccordant l'actionneur principal (1) à l'actionneur auxiliaire (3). L'actionneur auxiliaire (3) permet de maintenir un volume contrôlé de fluide en circulation sous pression dans la chambre de communication fluidique (4).
PCT/BR2018/050018 2017-01-27 2018-01-29 Système hydraulique ou pneumatique Ceased WO2018137014A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR102017001760-5 2017-01-27
BR102017001760-5A BR102017001760B1 (pt) 2017-01-27 Sistema hidráulico ou pneumático

Publications (1)

Publication Number Publication Date
WO2018137014A1 true WO2018137014A1 (fr) 2018-08-02

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ID=62977855

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2018/050018 Ceased WO2018137014A1 (fr) 2017-01-27 2018-01-29 Système hydraulique ou pneumatique

Country Status (1)

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WO (1) WO2018137014A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4769991A (en) * 1987-02-19 1988-09-13 Deere & Company Balanced hydraulic propulsion system
WO2009126893A1 (fr) * 2008-04-11 2009-10-15 Eaton Corporation Système hydraulique comprenant une pompe à cylindrée fixe pour commander des charges variables multiples et procédé de fonctionnement correspondant
EP2184495A1 (fr) * 2008-11-06 2010-05-12 Walvoil S.p.A. Procédé de limitation de la puissance maximale requise par le système hydraulique d'un engin de terrassement et vanne de contrôle directionnelle permettant de faire fonctionner ce procédé

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4769991A (en) * 1987-02-19 1988-09-13 Deere & Company Balanced hydraulic propulsion system
WO2009126893A1 (fr) * 2008-04-11 2009-10-15 Eaton Corporation Système hydraulique comprenant une pompe à cylindrée fixe pour commander des charges variables multiples et procédé de fonctionnement correspondant
EP2184495A1 (fr) * 2008-11-06 2010-05-12 Walvoil S.p.A. Procédé de limitation de la puissance maximale requise par le système hydraulique d'un engin de terrassement et vanne de contrôle directionnelle permettant de faire fonctionner ce procédé

Also Published As

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