• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates in particular to a sensor for measuring a pressure in a fluid, of which a body 1 comprises a membrane 2 and a wall 3 forming a peripheral support for and around the membrane, characterized in that: - the membrane and the wall peripheral are formed of a single piece; and the membrane and the peripheral wall together form a planar and smooth anterior surface 4 intended to be in contact with said fluid.
    公开号:FR3051248A1
    申请号:FR1654151
    申请日:2016-05-10
    公开日:2017-11-17
    发明作者:Khaled Abousaleh
    申请人:Khaled Abousaleh；
    IPC主号:
    专利说明:

    The present invention relates to the field of pressure sensors, particularly to membrane sensors, especially small sizes.
    Such sensors are known comprising a membrane attached by welding or gluing on a generally annular housing. When such a sensor is used to measure the pressure in a liquid, gas bubbles are attached to the junction between the housing and the membrane. This is all the more detrimental to the quality of the measurements as the sensor is small and the pressure levels to be measured are low.
    In addition, when the membrane is welded or glued according to the prior art, there is a phenomenon that appears when the membrane is deformed and that is called "tinfoil effect" or "oil can effect". Indeed, the deformation of the membrane is non-linear when moving from a positive pressure to a negative pressure and vice versa.
    In addition, the various materials used to make the sensor, including welds or glues, are not always chemically and / or biologically compatible with the fluid whose pressure is to be measured. Thus, in particular, corrosion may occur at the junction between the membrane and the housing, which is detrimental to the life of the sensor and / or the preservation of the fluid. The object of the invention is to propose means for producing a sensor which can be small while guaranteeing an improved lifetime and a high quality of the measurements.
    To achieve its purpose, the invention provides a body for a sensor for measuring a pressure in a fluid, especially in a liquid, comprising a membrane and a wall forming a peripheral support for and around this membrane, characterized in that that: - the membrane and the peripheral wall are formed in one piece; and, the membrane and the peripheral wall together form a substantially flat and smooth anterior surface intended to be in contact with the fluid.
    Preferably, the peripheral wall is annular and defines, at the rear of the membrane, a housing, in particular for at least one strain gauge. The invention also proposes a sensor for measuring a pressure in a fluid, characterized in that it comprises a body according to the invention and at least one strain gauge disposed on a rear face of the membrane, opposite to the anterior surface. . The invention also proposes a device for pumping a fluid, in particular a precision pump, characterized in that it comprises a cylindrical pumping chamber around an axis, this chamber being axially closed by the front surface of a body according to the invention. The invention also proposes a device for measuring a pressure in a living organism, in particular a human organism, characterized in that it comprises a sensor according to the invention, the sensor being intended to be implanted in this organism, this device also comprising wireless reading means of a measurement, preferably radio frequency type, in particular known by the acronym RFID.
    Several embodiments of the invention will be described below, by way of nonlimiting examples, with reference to the accompanying drawings in which: - Figure 1 is a perspective view of the body of a sensor according to the invention ; FIG. 2 is an axial view of the interior of the body of FIG. 1; - Figure 3 is a longitudinal sectional view of the body, along the plane III-III of Figure 2; and, - Figure 4 is a longitudinal view of the body, in use position at the end of a pumping chamber.
    The figures illustrate a body 1 of a pressure sensor. The body 1 has substantially a form of revolution about an axis XI; it is formed of one piece. It comprises: an anterior wall 2 serving as a membrane 2 for the sensor; and - an annular wall 3.
    The anterior wall, of small thickness E2, is in the form of a disc of axis of revolution XI and of membrane diameter D2. The annular wall constitutes a peripheral wall for supporting the membrane 2. The membrane 2 and the annular wall 3 together form an anterior surface 4 substantially flat and smooth. This anterior surface 4 extends radially from the axis XI, in the shape of a disc of anterior diameter D4.
    The annular wall 3 defines: a first cylindrical inner surface 6 of diameter D2; a second cylindrical inner surface 7 of diameter D7> D2; - an inner annular surface 8, extending radially between the two inner surfaces 6, 7, and forming with them an inner shoulder; a first cylindrical outer surface 11 of diameter D4; a second cylindrical outer surface 12 of diameter D12 forming the largest diameter of the body, with D12> D4; - An outer annular surface 13, extending radially between the two outer surfaces 11 and 12, and forming with them an outer shoulder; and a posterior annular surface 14 extending radially between the second inner surface 7 and the second outer surface 12.
    The inner surfaces together define a housing 16. In the example illustrated, the annular wall 3 is pierced with a hole 17 extending radially; this hole opens on the one hand through the first inner surface 7 and on the other through the second outer surface 12.
    The housing 16 is especially designed to contain strain gauges 20, visible in Figure 1. The hole 17 allows the passage of son connecting the gauges 20 with means, not shown, to treat the deformations of the membrane raised by the gauges . In the example shown, the sensor comprises four gauges 20 fixed to the rear of the membrane 2 perpendicular to each other.
    As illustrated in FIG. 4, a sensor according to the invention can be used to measure a pressure in a pumping chamber 22.
    In the illustrated example, the pumping chamber is cylindrical about an axis X22. The diameter D22 of the chamber is substantially equal to the front diameter D4 of the body 1. The body 1 is introduced at an axial end of the chamber 22, so that the axis XI of the body and the axis X22 of the chamber are substantially confused, the anterior surface 4 thus constituting a bottom for the chamber 22, vis-à-vis a piston, not shown. An orifice is formed laterally in a wall 24 of the chamber, for admission and / or expulsion of the fluid to be pumped. This orifice is arranged so that it comes flush with the anterior surface 4, that is to say the bottom 4 of the chamber. The outer annular surface 13 of the body 1 is provided to come into axial abutment against a first shoulder 25 of the wall 24 of the chamber 22; axial positioning of the anterior wall 4 in the chamber is thus ensured. In addition, an O-ring 26 is compressed between the outer annular wall 13 and a second shoulder 27 of the wall 24. The advantage of sealing against the outer annular surface 13 is to reduce the influence of the clamping constraints on the diaphragm and the strain gauges. This is a major interest in the shape of this sensor. Most commercial sensors seal on the front surface 4 next to the membrane which has the effect of deforming the latter and thus to interfere with the measurement. The other advantage of not sealing the anterior surface 4 is that this surface remains flat and allows the circulation of liquids tangentially to the membrane without trapping gas or particles.
    The membrane 2 has a large D2 / E2 slenderness. Its thickness E2 is small relative to the thickness E3 = (D4-D2) / 2 of the annular wall 3 at the location of the anterior surface 4, so that the annular wall is rigid relative to the membrane. In the example illustrated, the dimensions of the sensor are substantially:
    El = 3.6 mm E2 = 0.06 mm E3 = 1.25 mm D2 = 3.5 mm D4 = 6 mm D12 = 8 mm
    Preferably, for a sensor according to the invention, one chooses: 0.01 mm <E2 <1 mm and 1 mm <D2 <5 mm
    Preferably, the sensor body is made of stainless steel or titanium or a derivative of stainless steel; it can be produced by machining or 3D printing.
    Of course, the invention is not limited to the preferred embodiments which have just been described but, on the contrary, the invention is defined by the following claims.
    It will be apparent to those skilled in the art that various modifications can be made to the embodiments described above, in the light of the teaching that has just been disclosed.
    Thus, instead of four gauges, the sensor can understand a different number; they can be arranged differently.
    A sensor according to the invention is adapted to equip a precision pump. It can also equip another device.
    A sensor according to the invention is particularly advantageous, in fact: it is a sensor whose membrane is deformed, and whose strain gauges, positioned on the inside, make it possible to measure the variations in displacement of the membrane; - the body is made in one piece without welding or gluing; the material which constitutes it has, therefore, an optimized behavior because the deformations of the membrane are in the elastic domain of the material, and the life of the sensor is high; - The lack of welding and bonding allows its miniaturization; - The absence of welding and gluing, eliminating any risk of porosity, allows optimal chemical and biological compatibility; - The flush membrane, that is to say forming a single front surface with the annular wall, is optimized for liquids because it does not retain the gas bubbles; the measurement accuracy of the pressure is improved and the optimized behavior of the device equipped with such a sensor; - The measuring range (in English: Full pressure range) and the maximum allowable pressure (in English: Over pressure) are high, thanks to the elastic resistance of the material which consists entirely of the body of the sensor; it is sensitive neither to vibrations nor to noise, only to variations in pressure, the ratio between the thickness of the annular wall of the body and that of the membrane being very high; - By its dimensional characteristics and biological compatibility, this sensor can be implantable wirelessly in the human body because reliable and has a long life; in addition, the gauges used consume a weak current, which makes it possible to have an implantable product; this sensor can even be passive (without battery) because the gauges require a low activation energy; this sensor uses miniature semiconductor gauges which have a gauge factor equal to 200, much higher than the gauge factor of metal gauges which is 3; which makes it possible to measure very small deformations; with a machined membrane according to the invention, the "foil" effect is corrected because the linearity of the deformation is maintained; this correction makes it possible to measure lower pressures and to measure small negative-positive pressure variations while having a deformation which remains linear.
    Another advantage of a sensor according to the invention is that the strain gauges can be directly applied to the membrane (electrically isolated), so that when there is deformation of the membrane, there is a direct transmission of this deformation on the gauges; this makes it possible to have a precise measurement and allows to measure small deformations. On the contrary, the market sensors often contain a viscous liquid or oil in order to transmit the deformation of the membrane towards the sensitive element, which causes a loss of sensitivity and precision of the measurement. In addition, gas bubbles are likely to be present in the liquids used, which causes damping in the transmission of pressure and sensitivity to temperature and ambient pressure.
    权利要求:
    Claims (8)
    [1" id="c-fr-0001]
    claims
    1. Body (1) for a sensor for measuring a pressure in a fluid, comprising a membrane (2) and a wall (3) forming a peripheral support for and around said membrane, characterized in that: - said membrane and said peripheral wall are formed in one piece; and, said membrane and said peripheral wall together form an anterior surface (4) substantially flat and smooth, intended to be in contact with said fluid.
    [2" id="c-fr-0002]
    2. Body according to claim 1, characterized in that the peripheral wall (3) is annular and defines, at the rear of the membrane (2), a housing (16), in particular for at least one gauge (20) of constraints.
    [3" id="c-fr-0003]
    3. Body according to one of claims 1 and 2, characterized in that it is made in one piece, by machining.
    [4" id="c-fr-0004]
    4. Body according to one of claims 1 and 2, characterized in that it is made in one piece, by 3D printing.
    [5" id="c-fr-0005]
    5. Body according to one of claims 1 to 4, characterized in that the membrane (2) has a thickness (E2) of between 0.01 mm and 1 mm, and a diameter (D2) of between 1 mm and 5 mm. mm.
    [6" id="c-fr-0006]
    6. Sensor for measuring a pressure in a fluid, characterized in that it comprises a body (1) according to one of the preceding claims and at least one strain gauge (20) disposed on a rear face of the membrane ( 2), opposite to the anterior surface (4).
    [7" id="c-fr-0007]
    7. Device for pumping a fluid, particularly a precision pump, characterized in that it comprises a cylindrical pumping chamber (22) about an axis (X22), said chamber being axially closed by the front surface (4) of a body (1) according to one of claims 1 to 5.
    [8" id="c-fr-0008]
    8. Device for measuring a pressure in a living organism, in particular human, characterized in that it comprises a sensor according to claim 6, said sensor being designed to be implanted in said organism, said device further comprising reading means without wire of a measurement, preferably radiofrequency type.
    类似技术:
    公开号 | 公开日 | 专利标题
    FR3051248B1|2019-06-07|DEVICE FOR MEASURING PRESSURE IN A FLUID AND PUMP EQUIPPED WITH SUCH A DEVICE.
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    FR2645206A1|1990-10-05|Air valve for a diaphragm pump
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    EP0421900A1|1991-04-10|Sealing of a cylindrical part, moving axially and/or rotarily in a chamber
    FR3006031A1|2014-11-28|REINFORCED METAL BELLOW SHAPE SEALING DEVICE.
    EP0026682B1|1983-02-09|Hydraulic dynamometer
    EP3126265B1|2017-12-06|Assembly for dispensing an aerosol comprising an improved area for contact with a neck of a container
    FR3012907A1|2015-05-08|DEVICE FOR SUPPORTING A WORKPIECE FOR ULTRASONIC MEASUREMENT EQUIPMENT
    FR3041681B1|2019-07-19|PRESSIOMETRIC PROBE
    WO2020038862A1|2020-02-27|Device for sealably connecting a first pipe to a second pipe
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    FR3085117A1|2020-02-28|Disposable port device for connecting a functional unit to a flexible wall of a disposable container and method of manufacturing a disposable port device
    CH307419A|1955-05-31|Thrust bearing with device for determining the thrust exerted on this bearing.
    同族专利:
    公开号 | 公开日
    JP2017207480A|2017-11-24|
    CN107356363A|2017-11-17|
    US20170328796A1|2017-11-16|
    CN107356363B|2021-04-02|
    JP6868460B2|2021-05-12|
    FR3051248B1|2019-06-07|
    EP3244180A1|2017-11-15|
    US10345174B2|2019-07-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20130145866A1|2009-11-13|2013-06-13|Pulssar Technologies|Device for monitoring sample-collection using a piston pump|
    US20110144531A1|2009-12-16|2011-06-16|Marcotte Amy L|Gastric Band System Injector with Accelerometer|
    JPH10111199A|1996-10-09|1998-04-28|Nok Corp|Pressure sensor|
    SE0400330D0|2004-02-12|2004-02-12|Gambro Lundia Ab|Pressure sensing|
    US7775215B2|2005-02-24|2010-08-17|Ethicon Endo-Surgery, Inc.|System and method for determining implanted device positioning and obtaining pressure data|
    DK1818664T3|2006-02-13|2013-08-05|Hoffmann La Roche|Apparatus for recognizing a pressure change in the liquid path of a micro-dosing device|
    CN201739155U|2010-06-01|2011-02-09|大井泵浦工业股份有限公司|Connecting pipe device of pumping pressure transmitter|DE102016225652A1|2016-12-20|2018-06-21|Piezocryst Advanced Sensorics Gmbh|Method for producing a sensor housing for a force or pressure sensor and sensor housing, force or pressure sensor and use of an additive manufacturing device|
    WO2019166605A1|2018-03-02|2019-09-06|Grundfos Holding A/S|Pressure sensor|
    LU101845B1|2020-06-10|2021-12-10|Rotarex S A|Pressure sensor formed by strain gauge on a deformable membrane of a fluid device|
    法律状态:
    2017-04-10| PLFP| Fee payment|Year of fee payment: 2 |
    2017-11-17| PLSC| Search report ready|Effective date: 20171117 |
    2018-03-30| CA| Change of address|Effective date: 20180228 |
    2018-04-16| PLFP| Fee payment|Year of fee payment: 3 |
    2020-03-18| PLFP| Fee payment|Year of fee payment: 5 |
    2021-04-26| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1654151A|FR3051248B1|2016-05-10|2016-05-10|DEVICE FOR MEASURING PRESSURE IN A FLUID AND PUMP EQUIPPED WITH SUCH A DEVICE.|
    FR1654151|2016-05-10|FR1654151A| FR3051248B1|2016-05-10|2016-05-10|DEVICE FOR MEASURING PRESSURE IN A FLUID AND PUMP EQUIPPED WITH SUCH A DEVICE.|
    EP17168619.9A| EP3244180A1|2016-05-10|2017-04-28|Device for measuring a pressure in a fluid and pump provided with such a device|
    JP2017091132A| JP6868460B2|2016-05-10|2017-05-01|A device for measuring pressure in a fluid and a pump equipped with the device|
    US15/590,069| US10345174B2|2016-05-10|2017-05-09|Device for measuring a pressure in a fluid and pump provided with such a device|
    CN201710323711.6A| CN107356363B|2016-05-10|2017-05-10|Fluid pressure measuring device and pump equipped with such a measuring device|
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