FR2885218A1 - Differential pressure measurement device, for indirect detection of fluid circulation, has piston subjected to differential pressure of fluid in chambers, and maintained in central position by springs - Google Patents
Differential pressure measurement device, for indirect detection of fluid circulation, has piston subjected to differential pressure of fluid in chambers, and maintained in central position by springs Download PDFInfo
- Publication number
- FR2885218A1 FR2885218A1 FR0504373A FR0504373A FR2885218A1 FR 2885218 A1 FR2885218 A1 FR 2885218A1 FR 0504373 A FR0504373 A FR 0504373A FR 0504373 A FR0504373 A FR 0504373A FR 2885218 A1 FR2885218 A1 FR 2885218A1
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- FR
- France
- Prior art keywords
- differential pressure
- fluid
- piston
- springs
- chambers
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0089—Transmitting or indicating the displacement of pistons by electrical, electromechanical, magnetic or electromagnetic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
- G01L13/02—Devices or apparatus for measuring differences of two or more fluid pressure values using elastically-deformable members or pistons as sensing elements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
DESCRIPTIONDESCRIPTION
La présente invention concerne un dispositif mécanique qui permet la détection d'une pression différentielle qui suivant les dimensions du dispositif peut commencer à quelques millibar (environ 5 mbar) jusqu'à quelques dizaines de bar. The present invention relates to a mechanical device which allows the detection of a differential pressure which according to the dimensions of the device can start at a few millibar (about 5 mbar) up to a few tens of bar.
Il existe sur le marché des dispositifs ayant le même but, mais ils ne réunissent pas les critères de grande sensibilité (fonctionnement possible dès 5 mbar), de tenue en pression statique de plusieurs bar, de fiabilité (pas de membrane), d'entretien (démontage complet possible), de tenue en température (tenue sans problème jusqu'à 70 C, et dépend plus du capteur que du pressostat proprement dit, objet du présent brevet) et finalement de coût. There are devices on the market with the same purpose, but they do not meet the criteria of high sensitivity (operation possible from 5 mbar), resistance to static pressure of several bar, reliability (no membrane), maintenance (complete dismantling possible), withstand temperature (withstand without problem up to 70 C, and depends more on the sensor than the pressure switch itself, object of this patent) and finally cost.
Ce dispositif appelé pressostat différentiel à l'avantage de réunir ces critères. On pourra l'utiliser particulièrement pour la détection d'une circulation d'eau minimum dans un circuit de thermo-régulation à eau sous pression (thermorégulateurs à eau jusqu'à 160 C). En effet dans cette utilisation, on cherche à s'assurer qu'une circulation d'eau minimum se fait, sans avoir besoin d'une très grande précision et d'un temps de réponse rapide. Par contre, on a besoin d'un détecteur économique, facile d'entretien, insensible aux impuretés, ne subissant pas l'intégralité de la chaleur du fluide, et capable de résister à une pression statique d'environ 15 bar. This device called differential pressure switch has the advantage of meeting these criteria. It can be used especially for the detection of a minimum circulation of water in a pressurized water thermo-regulation circuit (water thermoregulators up to 160 C). Indeed in this use, it seeks to ensure that a minimum water flow is done, without the need for a very high precision and a fast response time. On the other hand, one needs a detector that is economical, easy to maintain, insensitive to impurities, does not undergo all the heat of the fluid, and is able to withstand a static pressure of about 15 bar.
Il pourra également être utilisé dans d'autres applications. It can also be used in other applications.
Le coeur du dispositif est un piston (3) qui peut être soumis sur ses 2 faces à une pression différentielle. Celle ci peut être d'origine liquide ou gaz. The heart of the device is a piston (3) which can be subjected on its two sides to a differential pressure. This can be of liquid or gas origin.
2 orifices El et E2 permettent le raccordement du pressostat différentiel. Ces 2 orifices peuvent se situer sur le corps (2) ou bien sur les flasques (l a) et (lb). Le fluide rentre ainsi dans les chambres CA et CB correspondantes et exerce une pression différentielle. Dans le cas ou la pression différentielle est nulle, le piston est maintenu en position centrale par 2 ressorts (4A) et (4B). Si la pression différentielle n'est pas nulle, le piston bougera dans un sens ou dans l'autre en fonction du signe positif ou négatif de la pression différentielle A-B, et si la force exercée sur la surface du piston est supérieure à la force du ressort (4A) ou (4B). Les caractéristiques des ressorts influent directement sur la sensibilité à la pression différentielle. 2 ports El and E2 allow the connection of the differential pressure switch. These 2 holes can be located on the body (2) or on the flanges (l a) and (Ib). The fluid thus enters the corresponding chambers CA and CB and exerts a differential pressure. In the case where the differential pressure is zero, the piston is held in central position by 2 springs (4A) and (4B). If the differential pressure is not zero, the piston will move in one direction or the other depending on the positive or negative sign of the differential pressure AB, and if the force exerted on the surface of the piston is greater than the force of the spring (4A) or (4B). The characteristics of the springs have a direct influence on the sensitivity to the differential pressure.
La position du piston (3) est détectée par un fin de course type tout ou rien (Cl) ou (C2). The position of the piston (3) is detected by an on / off switch (Cl) or (C2).
Ces derniers représentés sur le dispositif sont des fin de course inductifs du commerce, mais une adaptation des flasques (la) et (lb) permet le montage d'autres types de détecteurs, mécanique, inductif avec d'autres formes, capacitifs, à ultra sons etc. Il est aussi possible de monter des fin de course analogiques qui donne la position instantanée du piston, celui-ci pouvant se situer entre sa position de repos et en butée dans un sens ou dans l'autre. Dans ce cas, on peut mesurer une valeur de pression différentielle avec une certaine résolution et un certain temps de réponse. The latter represented on the device are commercial inductive limit switches, but an adaptation of the flanges (1a) and (1b) allows the assembly of other types of detectors, mechanical, inductive with other forms, capacitive, ultra sounds etc. It is also possible to mount analog limit switches which gives the instantaneous position of the piston, which can be between its rest position and abutting in one direction or the other. In this case, a differential pressure value can be measured with a certain resolution and a certain response time.
Ce fonctionnement reste valable avec des dépressions au lieu de pressions. This operation remains valid with depressions instead of pressures.
Le piston (3) est guidé sur le corps (2) avec un jeu minimum compatible avec un ajustement glissant sans efforts et minimisant les fuites entre les chambres CA et CB. The piston (3) is guided on the body (2) with a minimum clearance compatible with an effortless sliding fit and minimizing leakage between the CA and CB chambers.
L'étanchéité est obtenu par 2 joints toriques entre le corps (2) et les flasques (la) et (lb) ainsi que 2 autres joints toriques entre les flasques et les fin de course. Ces derniers joints toriques font partie intégrante des fin de course eux-mêmes et non du pressostat proprement dit. The seal is obtained by 2 O-rings between the body (2) and the flanges (la) and (Ib) and 2 other O-rings between the flanges and the limit switches. These latter O-rings are an integral part of the limit switches themselves and not the actual pressure switch.
Les flasques (1 a) et (lb) sont soit assemblés par des vis sur le corps, soit assemblés entre eux par des vis qui passent à l'extérieur du corps. Cette dernière solution permet de ne pas réaliser les taraudages sur le corps ou que sur une flasque. The flanges (1 a) and (lb) are either assembled by screws on the body, or assembled together by screws that pass outside the body. This last solution makes it possible not to make tapping on the body or on a flange.
Le nombre des vis et leur taille sera fonction de la force exercée par la pression statique maximale sur le piston qui exercera une force correspondante sur les flasques. The number of screws and their size will be a function of the force exerted by the maximum static pressure on the piston which will exert a corresponding force on the flanges.
A titre d'exemple, si le piston fait un diamètre 8 cm, avec une pression statique de 5 mbar, on calcul une force de 2,5 N. Avec une pression statique de 10 bar, on calcul une force de 500 daN. By way of example, if the piston is 8 cm in diameter, with a static pressure of 5 mbar, a force of 2.5 N is calculated. With a static pressure of 10 bar, a force of 500 daN is calculated.
Les matériaux utilisés pour la réalisation seront compatible avec le fluide en service qu'il 20 soit liquide ou gazeux. Pour l'eau, on pourra par exemple utiliser de l'aluminium ou bien de l'acier inoxydable. Les ressorts pourront être en inox. The materials used for the realization will be compatible with the fluid in use whether it is liquid or gaseous. For water, it will be possible for example to use aluminum or stainless steel. The springs can be made of stainless steel.
On peut aussi envisager des matériaux de type plastiques ou composites. It is also possible to envisage materials of the plastics or composite type.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0504373A FR2885218A1 (en) | 2005-04-29 | 2005-04-29 | Differential pressure measurement device, for indirect detection of fluid circulation, has piston subjected to differential pressure of fluid in chambers, and maintained in central position by springs |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0504373A FR2885218A1 (en) | 2005-04-29 | 2005-04-29 | Differential pressure measurement device, for indirect detection of fluid circulation, has piston subjected to differential pressure of fluid in chambers, and maintained in central position by springs |
Publications (1)
Publication Number | Publication Date |
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FR2885218A1 true FR2885218A1 (en) | 2006-11-03 |
Family
ID=37395902
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR0504373A Pending FR2885218A1 (en) | 2005-04-29 | 2005-04-29 | Differential pressure measurement device, for indirect detection of fluid circulation, has piston subjected to differential pressure of fluid in chambers, and maintained in central position by springs |
Country Status (1)
Country | Link |
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FR (1) | FR2885218A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009135612A1 (en) * | 2008-05-06 | 2009-11-12 | Hydac Electronic Gmbh | Device for measuring a pressure differential |
US20180364128A1 (en) * | 2017-06-16 | 2018-12-20 | CNH Industrial America, LLC | Pressure sensor for detecting a pressure differential |
-
2005
- 2005-04-29 FR FR0504373A patent/FR2885218A1/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009135612A1 (en) * | 2008-05-06 | 2009-11-12 | Hydac Electronic Gmbh | Device for measuring a pressure differential |
US20180364128A1 (en) * | 2017-06-16 | 2018-12-20 | CNH Industrial America, LLC | Pressure sensor for detecting a pressure differential |
US10816426B2 (en) * | 2017-06-16 | 2020-10-27 | Cnh Industrial America Llc | Pressure sensor for detecting a pressure differential |
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