Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
  • G01L15/00—Devices or apparatus for measuring two or more fluid pressure values simultaneously
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47G—HOUSEHOLD OR TABLE EQUIPMENT
  • A47G23/00—Other table equipment
  • A47G23/02—Glass or bottle holders
  • A47G23/0241—Glass or bottle holders for bottles; Decanters
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
  • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
  • G01L19/0061—Electrical connection means
  • G01L19/0069—Electrical connection means from the sensor to its support
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
  • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
  • G01L19/14—Housings
  • G01L19/147—Details about the mounting of the sensor to support or covering means
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
  • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
  • G01L19/14—Housings
  • G01L19/148—Details about the circuit board integration, e.g. integrated with the diaphragm surface or encapsulation
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
  • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
  • G01L5/13—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the tractive or propulsive power of vehicles
  • G01L5/136—Force sensors associated with a vehicle traction coupling

Definitions

• the invention relates to a pressure sensor system with a housing that carries pressurized, gaseous or liquid media, the housing having process connections that communicate with the pressurized media, according to the preamble of claim 1.
• the invention also relates to a safety valve with a pressure sensor system.
• Fuel storage systems for storing gaseous fuels such as natural gas or hydrogen with nominal pressures of up to 700 bar are designed, among other things, with a high pressure sensor and a low pressure sensor, whereby the high pressure sensor is used to determine the filling quantity and both sensors are used for system monitoring and system diagnosis.
• Such sensors are known, inter alia, from DE 102010003016, which discloses a pressure control unit comprising at least one high pressure sensor, an electromagnetic pressure control valve and a low pressure sensor in a common housing, each sensor being connected to a plug on the vehicle cable strand.
• the object of the present invention is to create an inexpensive pressure sensor system which has at least two pressure sensors, preferably a high pressure pressure sensor and a low pressure sensor, the pressure sensor system having a small installation space and being connectable to vehicle cabling with the least possible effort.
• the pressure sensor system should be designed in such a way that, on the one hand, its components, especially the sensitive electronic components, are optimally protected against environmental influences and, on the other hand, the pressure sensor system is also protected against unavoidable leakages of the pressurized media in the housing from the process connections in which the pressure transducers are installed are not impaired in their function and safety.
• Another object of the present invention is to provide a safety valve with a pressure sensor system that meets the requirements mentioned.
• the stated object is achieved by a pressure sensor system with the features of claim 1 and a safety valve with the features of claim 11.
• Advantageous embodiments of the invention are set out in the subclaims and the description.
• the pressure sensor system has a housing that carries pressurized, gaseous or liquid media, the housing having process connections that communicate with the pressurized media.
• the pressure sensor system comprises at least two pressure sensors, evaluation electronics and a cover, each of the pressure sensors being accommodated in a sealing manner in one of the process connections of the housing.
• the evaluation electronics are electrically connected to the pressure sensors and designed to receive the raw signals from the pressure sensors, to process them and to output them via an electrical connection of the pressure sensor system.
• the electrical connection is also designed to supply the evaluation electronics with electrical energy and extends through the cover, the process connections with the pressure sensors and the evaluation electronics being accommodated within the cover and the cover being designed to be gas-permeable or arranged on the housing in a gas-permeable manner.
• the invention provides for the cover to be designed to be gas-permeable or to be arranged on the housing in a gas-permeable manner. At the same time, however, the components of the pressure sensor system remain protected by the cover and the pressure sensor system needs a small installation space.
• the cover has a circumferential, gas-permeable seal which rests against the housing when the cover is installed, or a gas-permeable membrane.
• the cover can be made of a stable material that is impact-resistant and can withstand high temperatures and that can be gas-tight in itself. The components of the pressure sensor system inside the cover are thus protected as best as possible against environmental influences, for example against the ingress of dust.
• the cover consists of a gas-permeable material or is provided with through openings.
• contacts of the electrical connection can extend through the cover, the contacts preferably being attached to a circuit board of the evaluation electronics.
• the installation space is minimized, at the same time the contacts are held by the cover and can optionally also be partially surrounded by a wall of the cover and thus protected against external mechanical influences.
• the through holes in the cover for the contacts can be dimensioned in such a way that the cover is gas permeable even when the contacts are inserted. If the contacts extend from the circuit board, when assembling the pressure sensor system, the circuit board can be arranged and fastened to the inside of the cover in such a way that the contacts extend through the cover. This leads to a further reduction in the space required for the pressure sensor system.
• the pressure transducers are provided with radial sealing elements, in particular O-rings.
• the pressure transducers can be provided with axial sealing elements, in particular ring-shaped or disk-shaped elastomer seals.
• one embodiment provides that the pressure sensors are designed to detect pressures of different levels.
• the cover is cup-shaped, the open end of the cup-shaped cover being configured to rest on the housing of the device, and the evaluation electronics being preferably attached to the inside of the wall of the cover .
• the process connections are provided with an internal thread and the pressure transducers with the internal threads of the process connections complementary external threads are provided.
• the process connections have a groove into which a locking ring can be inserted to fix the pressure transducers in the process connections.
• the pressure transducers can be inserted into the process connections and fixed by the securing ring or, if the pressure transducers are designed with threads, the securing rings serve as a safeguard against loosening of the pressure transducers.
• the invention also provides a safety valve with a pressure sensor system with the features explained above.
• the housing of the pressure sensor system is designed as the housing of the safety valve, the safety valve being designed to open and close at least one flow path for the gaseous or liquid medium passing through one of the process connections, the pressure sensor being arranged displaceably in this process connection and a sealing body forms for opening and closing the flow path.
• Fig. 1 shows a pressure sensor according to the prior art.
• Fig. 2 shows an embodiment of the pressure sensor system according to the invention schematically in a sectional view.
• FIG 3 shows the parts of the pressure sensor system according to the invention that are essential for pressure measurement.
• FIG. 4 shows a detail of an alternative method of fastening a pressure sensor in a process connection of the pressure sensor system according to the invention.
• Fig. 5 shows a safety valve with a pressure sensor system according to the invention.
• Fig. 1 shows the state of the art using a pressure sensor from WIKA Alexander Wiegand SE & Co. KG (source: https://www.wika.at/upload/DS_PE8159_de_de_66832.pdf).
• This pressure sensor 1 comprises a pressure sensor 1 with a connection thread 3 for fastening the pressure sensor 1 in a process connection of a housing, a sealing area 5 with a seal in a groove for sealing the pressure sensor 1 to the housing and a wrench surface 6 for absorbing the assembly torque when assembling the Pressure sensor 1, furthermore a housing 7 to protect an internal evaluation electronics 8 and an electrical connection 9 for the electrical supply of the pressure sensor 1 and for signal output.
• the pressure sensor 1 is tall, so that a compact unit with little space requirement is impossible.
• FIG. 2 shows an embodiment of the pressure sensor system 100 according to the invention schematically in a sectional view.
• the pressure sensor system 100 comprises a housing 4a, which - not shown - carries pressurized, gaseous or liquid media.
• the housing 4a can be the housing of a safety valve.
• the housing 4a has process connections 2a which communicate with the pressurized media via bores in the housing 4a.
• the pressure sensor system 100 has two pressure sensors 200a, 300a, evaluation electronics 8a and a cover 13a. Each of the pressure sensors 200a, 300a is accommodated in a sealing manner in one of the process connections 2a of the housing 4a.
• the pressure sensors 200a, 300a can be designed to detect pressures of different levels, in particular if different media pressures prevail in the process connections 2a and the differential pressure is to be determined, if necessary.
• the pressure transducer 200a is designed as a high pressure pressure transducer and the pressure transducer 300a as a low pressure pressure transducer.
• the high-pressure pressure transducer 200a and the low-pressure pressure transducer 300a are preferably calibrated, i.e. the zero point and the slope of the characteristic curve are established by means of a two-point calibration in the course of the end-of-line test after the entire unit has been assembled.
• the evaluation electronics 8a are electrically connected to the pressure sensors 200a, 300a by means of lines 10b and are designed to receive the raw signals from the pressure sensors 200a, 300a, process them and output them via an electrical connection 9a of the pressure sensor system 100.
• the electrical connection 9a also serves to supply the evaluation electronics 8a with electrical energy and extends through the cover 13a.
• the process connections 2a with the pressure sensors 200a, 300a and the evaluation electronics 8a are accommodated within the cover 13a.
• the cover 13a protects the evaluation electronics 8a and the pressure sensors 200a, 300a from dust and / or moisture. It is designed to be gas-permeable and / or arranged in a gas-permeable manner on the housing 4a.
• the gas permeability of the cover 13a is on the one hand produced in that the cover 13a has a circumferential, gas-permeable seal 13c, which rests against the housing 4a in the installed state of the cover 13a, and on the other hand, in that the cover 13a is provided with through holes 13b.
• the cover 13a is provided with through holes 13b.
• a gas-permeable membrane can also be provided.
• the evaluation electronics 8a are built on a circuit board 8b. Contacts 9b of the electrical connection 9a are also soldered onto the circuit board 8b.
• the circuit board 8b is fastened to the cover 13a in such a way that the contacts 9b of the electrical connection 9a extend through the through holes 13b of the cover 13a.
• the circuit board 8b or the evaluation electronics 8a are preferably fastened directly in the cover 13a.
• the electronic evaluation system 8a is fastened with an independent holding part within the cover 13a.
• the cover 13a is cup-shaped, the open end of the cup-shaped cover 13a being configured to lie against the housing 4a, and the circuit board 8b with the evaluation electronics 8a being attached to the inside of the wall of the cover 13a, i.e. in the interior of the cup.
• the electrical contacts 9b of the electrical connection 9a are optionally connected to the evaluation electronics 8a via electrical connection lines (not shown).
• the electrical connection 9a is preferably embodied in one piece with the cover 13a; alternatively, the electrical connection 9a with the electrical contacts 9b is embodied separately from the cover 13a, with one or more electrical connection lines sealed on the cover 13a and on the electrical connection 9a providing the electrical connection Connect contacts 9b of the electrical connection 9a with corresponding contacts of the evaluation electronics 8a.
• the cover 13a is preferably connected to the housing 4a or a component connected to the housing 4a via a clip mechanism. Alternatively, the cover 13a is fastened directly or indirectly to the housing 4a with the aid of one or more screws.
• the process connections 2a are provided with an internal thread 3b, and the pressure sensors 200a, 300a are provided with external threads 3a complementary to the internal threads 3b of the process connections 2a.
• the pressure sensors 200a, 300a are completely sunk into the housing 4a.
• the pressure sensors 200a, 300a have frontal grooves 12a in which axial sealing elements 11a, in particular ring-shaped or disc-shaped elastomer seals, are arranged, which are arranged in a sealing area 5a of the pressure sensors 200a, 300a against a sealing surface the process connections 2a are present.
• the pressure sensors 200a, 300a can be provided with radial sealing elements, in particular O-rings.
• Wrench flats 6a on the pressure sensors 200a, 300a serve to absorb the assembly torque when the pressure sensors 200a, 300a are installed.
• the pressure sensors 200a, 300a are equipped with internal measuring cells 10a for converting the detected pressure into an electrical variable (raw signal) and corresponding connections for forwarding the raw signal via lines 10b to the common evaluation electronics 8a for all pressure sensors 200a, 300a.
• the common electrical connection 9a also serves for the electrical supply of all pressure sensors 200a, 300a or the measuring cells 10a.
• FIG. 3 shows the parts of the pressure sensor system 100 according to the invention that are essential for pressure measurement, the housing 4a and the cover 13a of FIG. 2 not being shown for reasons of clarity.
• 3 shows a high-pressure pressure sensor 200a and a low-pressure pressure sensor 300a for insertion into process connections 2a (not shown) in a housing 4a (compare FIG. 2).
• the high-pressure pressure sensor 200a and the low-pressure pressure sensor 300a have external threads 3a for screwing into the process connections.
• a sealing area 5a on the end faces of the pressure sensors 200a, 300a is used to seal the pressure sensors 200a, 300a from the housing 4a.
• the wrench surface 6a on the pressure transducers 200a, 300a is provided for absorbing the assembly torque during the assembly of the pressure transducers 200a, 300a.
• Internal measuring cells 10a serve to convert the detected pressure into an electrical variable and have connections for forwarding the raw signal of the electrical variable by means of lines 10b to a common evaluation electronics 8a for all pressure sensors 200a, 300a.
• a common electrical connection 9a is provided for the electrical supply of all pressure sensors 200a, 300a and for forwarding all electrical signals.
• the electrical connection 9a can be designed in such a way that, in addition to its function as a connection for the signal line and power supply, it forms the gas-permeable cover 13a or is designed in one piece with the gas-permeable cover and protects the evaluation electronics 8a and the pressure sensors 200a, 300a.
• the process connection 2a has an inlet 14b for liquid or gaseous media carried in the housing 4b for pressurizing the pressure transducer 200a, 300a.
• a sealing surface 15b in the inlet 14b serves to seal against the pressure transducer 200a, 300a.
• a guide surface 16b is provided on the process connection 2a for guiding the pressure transducer 200a, 300a in the housing 4b.
• a recess 17b is used to fasten the pressure transducer 200a, 300a with a securing ring 18b in the housing 4b.
• the pressure transducer 200a, 300a is equipped with a cylindrical extension 19b including a groove 12b for radial sealing in the housing 4b with a seal 11b.
• a guide surface 20b is provided on the pressure transducer 200a, 300a for guiding the pressure transducer 200a, 300a on the guide surface 16b of the process connection 2a of the housing 4b.
• a support surface 21b of the pressure transducer 200a, 300a serves as a contact surface for the securing ring 18b when pressure is applied to the pressure transducer 200a, 300a.
• the groove 12b with the seal 11b in the housing 4b can be implemented.
• Fig. 5 shows a detail of a safety valve 500 with an above-explained pressure sensor system 100 according to the invention, of which in Fig. 5 a pressure sensor 200a, 300a is shown in a process connection 2a of the housing 4c, the housing 4c at the same time as the housing of the safety valve 500 and as the housing of the pressure sensor system 100 is used.
• the pressure transducer 200c, 300c is designed as a sealing body of the safety valve 500.
• Process connections 2a (one of which is shown in the drawing) together with an inlet 14c for pressurizing the pressure transducer 200c, 300c with pressurized media guided in the housing 4c are formed in the housing 4c.
• a sealing surface 15c serves to seal against the pressure transducer 200a, 300a.
• a guide surface 16c is used to guide the pressure transducer 200a, 300a in the housing 4c.
• On Recess 17c is designed to limit the position of pressure transducer 200a, 300a with a securing ring 18c in housing 4c.
• An outlet 23c serves to discharge the gaseous or liquid medium from the safety valve 500.
• the pressure transducer 200a, 300a has an attachment 19c for medium guidance with a groove 12c with a seal 11c for sealing in the housing 4c.
• a guide surface 20c of the pressure transducer 200a, 300a is used to guide the pressure transducer 200a, 300a on the guide surface 16c of the process connection 2a of the housing 4c.
• a support surface 21c of the pressure transducer 200a, 300a forms a contact surface with a closing spring 24c, the closing spring 24c being arranged between the support surface 21c and the locking ring 18c for setting the opening pressure and for closing the safety valve 500.
• a seal in the area of the guide surfaces 20c, 16c can prevent a secondary flow when the safety valve 500 is open.
• this safety valve has conventional features which are well known to the person skilled in the art and therefore do not require any explanation.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Measuring Fluid Pressure (AREA)

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Publications (1)

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Cited By (1)

Citations (6)

Family Cites Families (6)

• 2019
  • 2019-09-05 AT ATGM97/2019U patent/AT17013U1/de unknown
• 2020
  • 2020-08-20 WO PCT/AT2020/060311 patent/WO2021042144A1/de not_active Ceased

Patent Citations (6)

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