CH432029A - Liquid flow detection device - Google Patents
Liquid flow detection deviceInfo
- Publication number
- CH432029A CH432029A CH298365A CH298365A CH432029A CH 432029 A CH432029 A CH 432029A CH 298365 A CH298365 A CH 298365A CH 298365 A CH298365 A CH 298365A CH 432029 A CH432029 A CH 432029A
- Authority
- CH
- Switzerland
- Prior art keywords
- liquid
- nozzle
- pipe
- flow
- pressure
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
- G21D3/04—Safety arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/38—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule
- G01F1/383—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction the pressure or differential pressure being measured by means of a movable element, e.g. diaphragm, piston, Bourdon tube or flexible capsule with electrical or electro-mechanical indication
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/0006—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances
- G01P13/0066—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances by using differences of pressure in the fluid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Measuring Volume Flow (AREA)
Description
Dispositif de détection du débit d'un liquide
La présente invention a pour objet un dispositif de détection du débit d'un liquide, destiné notamment à commander automatiquement le déclenchement de manoeuvres de sécurité lorsque le débit d'un fluide dans une canalisation s'abaisse à ulle valeur fixée à l'avance.
De tels dispositifs sont surtout utiles chaque fois qu'il est nécessaire d'assurer l'arrêt d'un appareil lorsque la circulation du fluide est interrompue, ou même seulement réduite. Cette nécessité se rencontre par exemple dans le cas des pompes à diffusion, le refroidissement du corps de la pompe devant être assuré en permanence. Si la circulation de lNeau de refroidissement est interrompue pour une raison quelconque, la pompe doit être immédiatement arrêtée et les vannes qui l'encadrent doivent être fermées. En général, ces opérations sont commandées automatiquement par l'intermédiaire d'un circuit électrique.
Un dispositif relativement simple utilisé jusqu'à ce jour pour détecter une réduction ou l'interruption de la circulation d'un fluide comporte un manomètre à membrane qui mesure la pression statique dudit fluide. On peut également faire appel à un tube de Venturi, qui donne une indication du débit d'eau à partir des pressions observées. de part et d'autre d'un étranglement situé sur la canalisation. Toutefois, ces dispositifs n'assurent pas la sécurité désirable.
En effet, une obturation de la canalisation en aval du manomètre ne modifie pas les indications de celuici. De même, si une accumulation de matière se produit dans l'étrangle- ment du tube de Venturi, l'indication de débit subsiste bien que la circulation du fluide soit interrompue.
Pour éviter ces inconvénients, on a proposé d'utiliser un flotteur hélicoïdal placé dans un tube de vendre et entraîné par le fluide en circulation, la position de ce flotteur étant repérée par un rayon lumineux associé à une cellule photo-électrique. Cependant il s'agit là d'un dispositif fort complexe qui est sujet à de nombreux incidents de fonctionnement.
Par opposition à ces appareils, la présente invention propose un dispositif d'une grande simplicité qui apporte une sécurité de fonctionnement nettement amé liorée.
Elle concerne un dispositif de détection du débit d'un liquide dans une canalisation, comportant, dans le sens de l'écoulement du liquide, un premier tronçon de canalisation terminé par une tuyère et un second tronçon en liaison étanche avec le premier et délimitant avec la tuyère une chambre dans laquelle une dépression est crée par la circulation du liquide dans la tuyère, une capsule manométrique détectant les variations de pression dans ladite chambre par rapport à la pression ambiante.
I1 apparaît clairement que le manomètre ne peut indiquer une dépression que lorsque le fluide circule effectivement dans l'éjecteur.
Afin de mieux faire ressortir les caractéristiques et les avantages essentiels du dispositif objet de l'invention, on en décrit ci-après, en se référant à la figure unique jointe, un mode de réalisation particulier choisi à titre d'exemple non limitatif.
L'appareil représenté sur la figure comprend essentiellement un éjecteur 1 qui peut être relié, par les raccords 2 et 3, à la canalisation dans laquelle circule le fluide. L'éjecteur 1 peut être d'un type très simple car son volume d'aspiration est très restreint Dans le cas particulier décrit, il est constitué par une trompe à eau comportant une buse 4 et un diffuseur 5.
Une capsule manométrique 6 est branchée latéralement sur la trompe à eau 1. La membrane 8 de cette capsule manométrique est en liaison par un levier 7 avec un microeontact 9. Celui-ci assure la fermeture du circuit électrique commandant les manoeuvres de sécurité.
Lorsque l'appareil est en service, la circulation du fluide dans la trompe à eau 1 orée un vide partiel dans la capsule manométrique 6. La position correspondante du levier 7 lié à la membrane est telle que le microcontact 9 est en position ouverte. Lorsque la circulation du fluide dans la trompe à eau 1 se trouve réduite pour une raison quelconque, la pression augmente dans la capsule manométrique 6 et la membrane 8 se déforme dans le sens de la fermeture du microcontact 9. Cette fermeture, qui commande le déclenchement des manu- vres de sécurité, intervient lorsque la pression dans la capsule manométrique 6 atteint une valeur limite déterminée, correspondant au débit de fluide minimum admissible.
Cette pression limite peut être réglée à volonté en agissant sur la course du levier 7.
Liquid flow detection device
The present invention relates to a device for detecting the flow rate of a liquid, intended in particular to automatically control the triggering of safety maneuvers when the flow rate of a fluid in a pipe drops to the value fixed in advance.
Such devices are especially useful whenever it is necessary to ensure the shutdown of an apparatus when the circulation of the fluid is interrupted, or even only reduced. This need is encountered, for example, in the case of diffusion pumps, the cooling of the pump body having to be ensured at all times. If the circulation of cooling water is interrupted for any reason, the pump must be immediately stopped and the surrounding valves must be closed. In general, these operations are controlled automatically through an electrical circuit.
A relatively simple device used to date for detecting a reduction or interruption in the circulation of a fluid comprises a diaphragm pressure gauge which measures the static pressure of said fluid. A Venturi tube can also be used, which gives an indication of the water flow from the pressures observed. on either side of a constriction located on the pipe. However, these devices do not provide the desirable security.
In fact, blocking the pipe downstream of the pressure gauge does not modify the indications of the latter. Likewise, if an accumulation of material occurs in the constriction of the Venturi tube, the flow indication will remain although the flow of fluid is interrupted.
To avoid these drawbacks, it has been proposed to use a helical float placed in a tube for sale and driven by the circulating fluid, the position of this float being marked by a light ray associated with a photoelectric cell. However, this is a very complex device which is subject to numerous operational incidents.
In contrast to these devices, the present invention provides a device of great simplicity which provides significantly improved operating safety.
It relates to a device for detecting the flow of a liquid in a pipe, comprising, in the direction of the flow of the liquid, a first section of pipe terminated by a nozzle and a second section in sealed connection with the first and delimiting with the nozzle a chamber in which a vacuum is created by the circulation of the liquid in the nozzle, a manometric capsule detecting the pressure variations in said chamber relative to the ambient pressure.
It is clear that the pressure gauge can only indicate a vacuum when the fluid is actually flowing through the ejector.
In order to better highlight the characteristics and the essential advantages of the device which is the subject of the invention, a description will be given below, with reference to the single attached figure, of a particular embodiment chosen by way of non-limiting example.
The apparatus shown in the figure essentially comprises an ejector 1 which can be connected, by the fittings 2 and 3, to the pipe in which the fluid circulates. The ejector 1 can be of a very simple type because its suction volume is very small. In the particular case described, it consists of a water pump comprising a nozzle 4 and a diffuser 5.
A manometric capsule 6 is connected laterally to the water pump 1. The membrane 8 of this manometric capsule is connected by a lever 7 with a microswitch 9. This closes the electrical circuit controlling the safety maneuvers.
When the apparatus is in service, the circulation of the fluid in the water pump 1 oré a partial vacuum in the manometric capsule 6. The corresponding position of the lever 7 linked to the membrane is such that the microswitch 9 is in the open position. When the circulation of the fluid in the water pump 1 is reduced for any reason, the pressure increases in the manometric capsule 6 and the membrane 8 is deformed in the direction of the closing of the microswitch 9. This closure, which controls the tripping safety maneuvers, occurs when the pressure in the manometric capsule 6 reaches a determined limit value, corresponding to the minimum allowable fluid flow rate.
This limit pressure can be adjusted at will by acting on the stroke of lever 7.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR968987 | 1964-03-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH432029A true CH432029A (en) | 1967-03-15 |
Family
ID=8826563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH298365A CH432029A (en) | 1964-03-27 | 1965-03-04 | Liquid flow detection device |
Country Status (5)
Country | Link |
---|---|
CH (1) | CH432029A (en) |
DE (1) | DE1989205U (en) |
ES (1) | ES311039A1 (en) |
GB (1) | GB1086804A (en) |
LU (1) | LU48270A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2474408A1 (en) * | 1980-01-28 | 1981-07-31 | Sibe | INSTANT CONSUMPTION INDICATOR FOR VEHICLE DRIVEN BY AN INTERNAL COMBUSTION ENGINE |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61118692A (en) * | 1984-11-13 | 1986-06-05 | ウエスチングハウス エレクトリック コ−ポレ−ション | Method of operating generation system of pressurized water type reactor |
EP0504597B1 (en) * | 1991-02-20 | 1995-07-19 | Matsushita Electric Industrial Co., Ltd. | Water purifying apparatus |
-
1965
- 1965-03-04 CH CH298365A patent/CH432029A/en unknown
- 1965-03-17 DE DEC12857U patent/DE1989205U/en not_active Expired
- 1965-03-18 GB GB11526/65A patent/GB1086804A/en not_active Expired
- 1965-03-26 ES ES0311039A patent/ES311039A1/en not_active Expired
- 1965-03-26 LU LU48270A patent/LU48270A1/xx unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2474408A1 (en) * | 1980-01-28 | 1981-07-31 | Sibe | INSTANT CONSUMPTION INDICATOR FOR VEHICLE DRIVEN BY AN INTERNAL COMBUSTION ENGINE |
Also Published As
Publication number | Publication date |
---|---|
ES311039A1 (en) | 1965-06-01 |
DE1989205U (en) | 1968-07-11 |
LU48270A1 (en) | 1965-05-26 |
GB1086804A (en) | 1967-10-11 |
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