Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D21/00—Measuring or testing not otherwise provided for
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
  • F01B31/00—Component parts, details, or accessories not provided for in, or of interest apart from, other groups
  • F01B31/12—Arrangements of measuring or indicating devices

Definitions

• the invention relates to a hydraulic device according to the preamble of patent claim 1.
• Hydraulic devices have different approaches to monitoring their operating parameters, such as pressure, motion and temperature.
• a disadvantage of such monitored hydraulic devices are the cables and connectors, which are a hindrance to movements of components of the equipment and their maintenance. Damage to the cables or connectors may cause the sensors to fail.
• Publication DE 10 2007 012 733 A1 discloses an autonomous pressure sensor on the housing of an axial piston unit, which wirelessly transmits measurement signals from a transmitter to a receiver.
• the electrical energy required for this and for obtaining and processing the electrical measuring signal is generated by a converter on site.
• a piezoelectric element is proposed which generates the energy from pressure pulsations of the working fluid in the region of the housing.
• the invention is based on the object, a hydraulic To create device that is comprehensively and reliably monitored or in which a comprehensive "condition monitoring" is possible, the space required for the corresponding sensor array should be minimal.
• the hydraulic device according to the invention has at least one component and an electronic, self-sufficient sensor arrangement.
• the sensor arrangement has at least one miniaturized transducer which is arranged on the component. Such transducers require minimal space.
• the senor arrangement has at least one miniaturized transmitter.
• the senor arrangement has at least one miniaturized receiver. Since the hydraulic device does not require sensitive electrical lines for signal transmission, the reliability of its monitoring is optimized.
• a particularly preferred embodiment has at least one pressure sensor, which is arranged on a pressurized component of the hydraulic device.
• a very important parameter of the hydraulic device can be monitored, and e.g. Operating states detected and overpressure prevented.
• Another particularly preferred embodiment has at least one acceleration sensor which is arranged on a moving component of the hydraulic device. Through integration, speeds and over long integration paths or positions are calculated. If the accelerometer measures centrifugal accelerations, its speed can be calculated by taking into account the distance of the accelerometer to the axis of rotation of the corresponding component.
• Another particularly preferred embodiment has at least one temperature sensor, which is arranged on a component of the hydraulic device.
• the transducers, the transmitter and a controller are integrated in the component of the hydraulic device, wherein the component forms a housing of the components. This eliminates special housing for the components, and their space requirement can be reduced to zero.
• the transducers, the transmitter and the controller are connected to at least one self-sufficient energy supply device, which preferably converts light energy, thermal energy or kinetic energy into electrical energy.
• the receivers are intermediate stations, which receive in groups signals from adjacent transmitters and transmit them to a central receiver.
• the required transmission power of the miniaturized transmitters can be reduced or the reliability of their data transmission can be increased.
• the hydraulic device is a hydrostatic displacement machine
• the component is a delivery piston.
• the arrangement of the transducers and the transmitter in or on the piston or in or on a cylinder wall offers the above-mentioned advantages.
• the hydrostatic displacement machine is preferably an axial piston unit.
• a rotational movement e.g. their cylinder drum are monitored by accelerometers with the above advantages.
• the hydraulic device is an adjustable displacement machine
• the component provided with a sensor arrangement according to the invention is an actuating piston
• the hydraulic device has a control valve
• the component provided with a sensor arrangement according to the invention is a valve piston
• the component is fixed to the housing.
• the component may e.g. be a standard screw plug.
• the transducer and a transmitter can be integrated and mounted simply by screwing the screw plug in the pressure chamber of the hydraulic device according to the invention.
• the components provided with sensors and other components of the hydraulic device are not made of metal, but of plastic.
• Figure 1 is a plan view of a first embodiment of a swash plate pump according to the invention partially cut;
• Figure 2 is a side view of the swash plate pump according to the invention with cut adjustment
• Figure 3 is a schematic representation of a present invention provided with a sensor assembly screw plug
• Figure 4 is a schematic representation of an invention provided with a sensor arrangement axial piston.
• FIG. 1 shows a swash plate pump 1 according to the invention. All the components shown in FIG. 1 correspond to the prior art, so that only essential elements and functions of the swash plate pump 1 are explained.
• the swash plate pump 1 is driven by a mounted on a roller bearing 4 in the housing 6 drive shaft 2.
• a cylinder drum 8 is set in rotation about the common axis of rotation 10, wherein the cylinder drum 8 has a plurality of evenly distributed on the circumference of the cylinder 12 and guided therein axial piston 14.
• the axial pistons 14 are axially displaceable in the associated cylinders 12, wherein they limit pressure spaces at their (in FIG. 1) right-hand end sections, while they are connected at their (in FIG. 1) left-hand end sections via a spherical piston foot 16, each with a sliding shoe 18.
• the piston feet 16 form with the respective sliding blocks 18 ball joints.
• the sliding blocks 18 move with the piston feet 16 on a circular path and are biased via a retraction plate 20 against a swash plate 22 (in Figure 1) to the left.
• the swash plate 22 is shown in FIG. 1 in its neutral central position. Position shown in which their contact surface for the sliding blocks 18 perpendicular to the axis of rotation 10 (and to the plane) extends.
• the swash plate 22 is arranged approximately annularly about the axis of rotation 10, wherein it is supported (in Figure 1) to the left against the housing 6 via rolling elements 24.
• the swash plate 22 has an eccentrically arranged arm 26 which is fixed to the outer periphery of the swash plate 22 and extends approximately parallel to the axis of rotation 10.
• the arm 26 of the swash plate 22 is connected via a pin 28 and a sliding block 30 with a control piston 32.
• the actuating piston 32 (in FIG. 1) is adjusted perpendicular to the plane of the drawing, whereby the swash plate 22 is pivoted about its sliding axis 30, the pin 28 and the arm 26 out of its above-described neutral position about its pivot axis 34.
• the spherical piston feet 16 of the axial piston 14 are held in the shoes 18, they follow during operation of the swash plate pump 1 a relative to the axis of rotation 10 inclined circular path, which is predetermined by the contact surface of the swash plate 22.
• the axial pistons 14 each perform an oscillating movement in the associated cylinder 12, wherein they perform a suction stroke during a first half circular path and a Verdrängerhub during a second half circular path.
• one of the half circular orbits associated channel as high-pressure channel 36 and the other of the other half circular path associated channel results as a suction channel 38th
• the setting angle of the swashplate 22 relative to the axis of rotation 10 or relative to the cylinder drum 8 and the axial piston 14 can be adjusted via the control piston 32, whereby the stroke of the axial piston 14 and thus the displacement of the swash plate pump 1 can be changed.
• FIG. 3 schematically shows a closure screw 52, in the interior of which a first exemplary embodiment of a sensor arrangement according to the invention is provided. It consists of a pressure transducer 54, a temperature sensor 56, a power supply device 58, an energy generating device 59, a controller 60 and a transmitter 62. All components 54, 56, 58, 59, 60, 62 are miniaturized and combined as a unit. The components 54, 56, 58, 59 are inserted into an end-side recess of the closure screw 52 such that the closure screw 52 forms a housing for the components 54, 56, 58, 59. Furthermore, the sensor arrangement has a receiver (not shown), e.g. is arranged on an outer wall of the housing 6 of the swash plate pump 1 at a position which allows the least possible undisturbed reception of the emitted from the transmitter 62 electromagnetic waves.
• a receiver not shown
• the pressure sensor 54 and the temperature sensor 56 record measured values from the interior of the swash plate pump 1.
• the measurement data is processed by the controller 60 and transmitted by the transmitter 62 to the receiver (not shown).
• the energy required by the components 54, 56, 60, 62 is generated by the power generation device 59.
• the vibration / pulsation or heat of the end face (in Figure 3 right) applied pressure medium is converted into electrical energy and distributed by the power supply device 58 to the components 54, 56, 60, 62, the energy requirement is minimized by miniaturization.
• the components 54, 56, 58, 59, 60, 62 are accommodated protected in the locking screw 52 and easily accessible and removable by unscrewing the locking screw 52 from the housing 6.
• the sensor arrangement according to the invention hinders the operation and maintenance of the swash plate pump 1 in any way, so that even after maintenance or replacement of components of the swash plate pump 1 an unrestricted high reliability of the present invention monitored hydraulic device is given.
• FIG. 4 shows schematically an axial piston 14, inside which a second embodiment of a sensor arrangement according to the invention is provided.
• the sensor arrangement serves to monitor further operating parameters of the swash plate pump 1 (according to FIG. 1).
• a Hubauf choir 64 and a Drehauf choir 66 are still provided.
• the transducers 54, 56, 64, 66 are accommodated together with the power supply device 58, the power generating device 59, the controller 60 and the transmitter 62 in the interior of an axial piston 14, wherein the end face at least the pressure sensor 54 is in contact with the pressure medium present in the cylinder 12 ,
• the components 54, 56, 58, 59, 60, 62 correspond to those of the previously described embodiment (according to FIG. 3).
• the additional Hubier choir 64 takes accelerations along the stroke direction of the axial piston 14 (in Figure 4 laterally), while the rotary sensor 66 receives accelerations perpendicular thereto.
• the acceleration values determined by the Hubaufillon 64 are converted by the controller 60 by integration into Hub effeten and by re-integration in Hubwege. From this, it is possible to calculate conveying volumes of the swash-plate pump 1, taking into account the stroke volume of the cylinders 12.
• the centrifugal accelerations determined by the rotary sensor 66 are converted into rotational speeds of the cylinder drum 8 and the drive shaft 2, respectively.
• the rotary sensor 66 measures the centrifugal acceleration, from which, taking into account the distance of the rotary sensor 66 and the axial piston 14 to the axis of rotation 10 of the cylinder drum 8 whose speed can be calculated.
• the sensor arrangement shown for an axial piston 14 may also be provided redundantly in a plurality of axial pistons of the same machine in order to improve the reliability and the accessibility.
• FIG. 2 shows essential parts of the adjusting unit 40 of the swash plate pump 1 according to the invention. All the components shown in FIG. 2 correspond to the prior art, so that only essential elements and functions of the adjusting unit 40 are explained.
• the adjusting unit 40 is largely mirror-symmetrical to the axis of rotation 10 of the swash plate pump 1 is formed. It has an adjusting housing 42, in which the adjusting piston 32 two Verstell réelle 44, 46 separates from each other.
• the swashplate 22 In the middle position (shown in FIG. 2) of the adjusting piston 32 biased by springs, the swashplate 22 (see FIG. 1) is in its neutral position oriented perpendicular to the axis of rotation 10. If via one of the adjustment channels 48, 50 pressure medium in the associated adjustment pressure chamber 44, 46 is promoted, the actuating piston 32 is moved from its shown middle position (in Figure 2) down or up. With simultaneous drive of the drive shaft 2 of the swash plate pump 1, the axial piston 14 thereby perform during their rotational movement of a lifting movement, whereby the swash plate pump 1 according to the invention sucks pressure medium through the suction passage 38 and displaced via the high pressure passage 36.
• an inventive monitoring of the actuating piston 32 is available. About an acceleration recording along its stroke direction (in Figure 2 of top down), an adjustment of the actuating piston 32 is determined and from the adjustment angle of the swash plate 22 are calculated.
• a sensor arrangement according to the invention can be arranged on a valve body (not shown) of the control valve 51, with which the swivel angle of the swash plate pump 1 is adjusted via the adjustment channels 48, 50, the adjustment pressure chambers 44, 46 and via the control piston 32 becomes.
• the energy generating device 59 can also generate electrical energy from the kinetic energy of the axial piston 14. This type of energy generation is particularly suitable for a sensor arrangement on the output shaft 2, on the shoes 18 or in the axial piston 14 and the cylinder drum 8 at.
• the electronic "condition-monitoring" according to the invention can be carried out deviating, for example, also at control blocks.
• a hydraulic device with a self-sufficient electronic sensor arrangement which has at least one miniaturized transducer. Such transducers require minimal space.
• the senor arrangement has at least one miniaturized transmitter. Since the hydraulic device then requires no sensitive electrical lines for signal transmission, the reliability of its monitoring is optimized.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Reciprocating Pumps (AREA)
• Measuring Fluid Pressure (AREA)
• Testing Or Calibration Of Command Recording Devices (AREA)
• Control Of Positive-Displacement Pumps (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=42993493

Family Applications (1)

Country Status (6)

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• 2009
  • 2009-05-18 DE DE200910021717 patent/DE102009021717A1/de not_active Withdrawn
• 2010
  • 2010-03-24 US US13/321,126 patent/US9127970B2/en not_active Expired - Fee Related
  • 2010-03-24 EP EP10711013A patent/EP2433100A2/de not_active Withdrawn
  • 2010-03-24 CN CN201080021631.1A patent/CN102428351B/zh not_active Expired - Fee Related
  • 2010-03-24 JP JP2012511158A patent/JP2012527558A/ja active Pending
  • 2010-03-24 WO PCT/EP2010/001825 patent/WO2010133272A2/de active Application Filing

Non-Patent Citations (1)

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