FR2577652A1 - Device for protection against water hammer - Google Patents
Device for protection against water hammer Download PDFInfo
- Publication number
- FR2577652A1 FR2577652A1 FR8502120A FR8502120A FR2577652A1 FR 2577652 A1 FR2577652 A1 FR 2577652A1 FR 8502120 A FR8502120 A FR 8502120A FR 8502120 A FR8502120 A FR 8502120A FR 2577652 A1 FR2577652 A1 FR 2577652A1
- Authority
- FR
- France
- Prior art keywords
- screw
- thread
- hand
- protection against
- water hammer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 3
- 239000012530 fluid Substances 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 6
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000004087 circulation Effects 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/043—Devices damping pulsations or vibrations in fluids specially adapted for protecting instruments from water hammer or vibrations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
- F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/02—Energy absorbers; Noise absorbers
- F16L55/027—Throttle passages
- F16L55/02772—Throttle passages using spirally or helically shaped channels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
DISPOSITIF DE PROTECTION CONTRE LES COUPS DE BELIER. PROTECTIVE DEVICE AGAINST RAMS.
L'invention concerne un dispositif de protection contre les coups de bélier comprenant un corps creux dont un canal de laminage hélicoïdal, circulant entre celui-ci et une vis coaxiale à ce canal et venant en butée contre un épaulement annulaire, est relié d'une part, à une canalisation où se trouve le fluide sujet à des surpressions anormales et, d'autre part, à un appareil de surveillance, respectivement de mesure de pression, devant tre protégé contre ces surpressions.The invention relates to a device for protection against water hammer comprising a hollow body of which a helical rolling channel, circulating between it and a screw coaxial with this channel and coming into abutment against an annular shoulder, is connected by a on the one hand, to a pipe in which there is the fluid subject to abnormal overpressures and, on the other hand, to a monitoring or pressure measuring device, which must be protected against these overpressures.
De tels dispositifs qui trouvent principalement leur application lorsque le fluide à surveiller est un liquide, sont en particulier mis en oeuvre lorsque l'appareil de surveillance associé est représenté par un appareil interrupteur manométrique ; dans un dispositif connu antérieurement, le canal de laminage hélicoïdal est placé entre les creux d'un taraudage du corps et les saillies tronquées du filetage d'une vis venant en appui axial contre un épaulement.Such devices which mainly find their application when the fluid to be monitored is a liquid, are used in particular when the associated monitoring device is represented by a pressure switch device; in a previously known device, the helical rolling channel is placed between the hollows of a female thread and the truncated projections of the thread of a screw coming to bear axially against a shoulder.
On a constaté que ce dispositif nécessitait une réduction importante de la hauteur du filetage, pour donner au canal de laminage une section compatible avec la circulation du fluide, en particulier lorsque ce dernier doit actionner des pièces mobiles ayant une course assez importante, comme le cas se présente pour l'actionnement direct ou indirect d'interrupteurs. Il résulte de cette réduction que des défauts d'adhérence entre le corps et la vis permettent à celle-ci, ou mme provoquent chez celle-ci, un dévissage à l'établissement duquel concourent notamment des circulations répétées du fluide, qui sont elles-mmes accompagnées de l'apparition de couples favorisant ce dévissage.It was found that this device required a significant reduction in the height of the thread, to give the rolling channel a section compatible with the circulation of the fluid, in particular when the latter must actuate moving parts having a fairly large stroke, as is the case. is available for direct or indirect actuation of switches. It results from this reduction that adhesion defects between the body and the screw allow the latter, or even cause in the latter, a loosening in the establishment of which contribute in particular repeated circulations of the fluid, which are themselves even accompanied by the appearance of couples favoring this unscrewing.
L'invention se propose, par suite, d'apporter à ce dispositif connu, des améliorations qui soient en mesure de contrecarrer les effets de dévissage intempestifs qui viennent d'tre mentionnés.The invention therefore proposes to make improvements to this known device which are able to counteract the untimely unscrewing effects which have just been mentioned.
Selon l'invention, le but visé est atteint grâce au fait que la vis présente d'une part, un filetage de fixation de section normalisée, et comporte, d'autre part, sur sa hauteur, un sillon hélicoïdal qui est orienté en sens inverse de celui du filetage, et dont la profondeur, ainsi que le pas, sont supérieurs à la profondeur, respectivement au pas du filetage de fixation.According to the invention, the aim is achieved thanks to the fact that the screw has on the one hand, a fixing thread of standardized section, and comprises, on the other hand, over its height, a helical groove which is oriented in the direction opposite to that of the thread, and whose depth, as well as the pitch, are greater than the depth, respectively the pitch of the fixing thread.
L'invention sera mieux comprise à la lecture de la description ci-dessous, et à l'examen des deux figures annexées qui l'accompagnent, et ou :
La figure 1 représente en élévation un dispositif
selon l'invention, coupé par un plan QQ'passant par
l'axe de révolution XX', et
La figure 2 illustre, en élévation, une vis interve
nant dans la fonction d'amortissement souhaitée.The invention will be better understood on reading the description below, and on examining the two accompanying figures which accompany it, and or:
Figure 1 shows in elevation a device
according to the invention, cut by a QQ 'plan passing through
the axis of revolution XX ', and
Figure 2 illustrates, in elevation, a screw interve
nant in the desired damping function.
Un appareil détecteur ou indicateur de pression 1 qui est visible sur la figure 1, comprend un boîtier 2 dont une partie fixe ou amovible 3 possède une cavité 4 de préférence cylindrique. Une région supérieure 5 de cette cavité est barrée par une paroi transversale 6, possédant une ouverture centrale 7 à travers laquelle peut se déplacer un piston 8 faisant office de poussoir, en vue d'actionner par exemple un interrupteur électrique 9 placé à l'intérieur du boîtier.A pressure detector or indicator device 1 which is visible in FIG. 1, comprises a housing 2 of which a fixed or removable part 3 has a cavity 4, preferably cylindrical. An upper region 5 of this cavity is barred by a transverse wall 6, having a central opening 7 through which a piston 8 acting as a pusher can move, in order to actuate for example an electric switch 9 placed inside of the housing.
L'étanchéité nécessaire à ce piston est procurée par exemple, par un joint d'étanchéité à lèvre 10, qui est ajusté sur les diamètres de la cavité et de la tige 11 du poussoir.The seal required for this piston is provided, for example, by a lip seal 10, which is adjusted to the diameters of the cavity and of the rod 11 of the pusher.
Un organe élastique 12 non représenté en détail, mais qui exerce une force en sens G, tend à donner au piston une position de repos définie par des butées qui ne sont pas illustrées
L'extrémité inférieure 13 de la cavité présente un taraudage 14 qui est apte à coopérer soit directement avec un filetage 15 disposé à l'extrémité d'une canalisation hydraulique 16, soit directement avec un filetage 17 d'un dispositif de protection contre les coups de bélier 18, si son installation se révèle nécessaire ; dans ce dernier-cas, le filetage 15 coopère avec un taraudage 19 du corps 20 du dispositif et si nécessaire, avec un joint 32.An elastic member 12 not shown in detail, but which exerts a force in direction G, tends to give the piston a rest position defined by stops which are not illustrated.
The lower end 13 of the cavity has a thread 14 which is able to cooperate either directly with a thread 15 disposed at the end of a hydraulic pipe 16, or directly with a thread 17 of a device for protection against impact ram 18, if its installation proves necessary; in the latter case, the thread 15 cooperates with a thread 19 on the body 20 of the device and, if necessary, with a seal 32.
Le corps 20 est pourvu d'un perçage 21 axial XX', qui débou- che à ses extrémités transversales opposées 22, 23, et qui comporte entre celles-ci un taraudage normalisé 24 et un épaulement annulaire 25. Une vis 26, voir aussi figure 2, présentant par exemple, une fente 27 pour son entrainement, comporte un filetage de maintien normalisé 27 qui vient coopérer avec le taraudage 24 et qui opère une fixation efficace de la vis lorsque celle-ci vient s'appuyer sur 1'épaulement 25.The body 20 is provided with an axial bore 21 XX ', which opens at its opposite transverse ends 22, 23, and which comprises between them a standardized thread 24 and an annular shoulder 25. A screw 26, see also Figure 2, showing for example, a slot 27 for its drive, has a standardized holding thread 27 which cooperates with the thread 24 and which operates an effective fixing of the screw when it comes to bear on the shoulder 25 .
Un sillon hélicoïdal 30 est pratiqué sur toute la hauteur -h-de la surface externe de la vis 26, de façon que sa profondeur-P-et son pas-M-soient supérieurs à la profondeur-p-du filetage, respectivement au pas-m- normalisés, et que son orientation soit dirigée en sens inverse de celui de ce filetage de maintien, voir aussi la figure 2. A helical groove 30 is formed over the entire height -h-of the external surface of the screw 26, so that its depth-P-and its pitch-M-are greater than the depth-p-of the thread, respectively at the pitch -m- standardized, and that its orientation is directed in the opposite direction to that of this retaining thread, see also FIG. 2.
En raison du fait que le diamètre interne de l'épaulement 25 est sensiblement égal au diamètre normalisé du noyau 31 de la vis, il apparaît clairement que le sillon 30 débouche, par exemple aux points 34 et 35, tant dans la région supérieure 23 du perçage que dans la région inférieure 22 dont le diamètre est forcément supérieur à celui du noyau. Un canal de laminage 40, passant par le sillon 30 et dans lequel le fluide peut circuler, est donc établi entre le corps 3 et la vis 26. Due to the fact that the internal diameter of the shoulder 25 is substantially equal to the standard diameter of the core 31 of the screw, it is clearly apparent that the groove 30 opens, for example at points 34 and 35, both in the upper region 23 of the drilling only in the lower region 22 whose diameter is necessarily greater than that of the core. A rolling channel 40, passing through the groove 30 and in which the fluid can circulate, is therefore established between the body 3 and the screw 26.
Des essais cycliques de longue durée ont montré que la vis n'était sujette à aucun desserrage, ce qui est notamment imputable au fait que, lorsque le fluide circule vers la cavité, le couple de desserrage communiqué à la vis est contrebalancé par une pression longitudinale élevée, tandis que, lorsque le fluide circule en sens inverse, le couple de serrage qui est communiqué à la vis applique celle-ci contre la butée, et n'est pas contrebalancé par la plus faible pression résiduelle présente dans la cavité.Long-term cyclic tests have shown that the screw is not subject to any loosening, which is notably due to the fact that, when the fluid circulates towards the cavity, the loosening torque communicated to the screw is counterbalanced by a longitudinal pressure high, while, when the fluid circulates in the opposite direction, the tightening torque which is communicated to the screw applies the latter against the stop, and is not counterbalanced by the lowest residual pressure present in the cavity.
La section du sillon 30 qui pourra prendre différentes formes, est avantageusement choisie de forme triangulaire.The section of the groove 30 which may take different forms, is advantageously chosen to be triangular in shape.
Il apparait clairement que l'invention s'applique également au cas où le boîtier 2 de l'appareil contient un appareil de mesure de pression à la place d'un interrupteur, ou lorsque celui-ci est, par exemple, constitué par un détecteur de proximité magnétique ou inductif.It is clear that the invention also applies to the case where the housing 2 of the device contains a pressure measuring device in place of a switch, or when the latter is, for example, constituted by a detector magnetic or inductive proximity.
Par ailleurs, on conçoit aisément que les organes placés dans la région 33 puissent tre rendus solidaires du boi- tier, à l'exception toutefois de la vis qui doit pouvoir tre choisie selon l'effet amortisseur de son canal de laminage, et fixée ultérieurement. Furthermore, it is easily conceivable that the members placed in region 33 can be made integral with the housing, with the exception, however, of the screw which must be able to be chosen according to the damping effect of its rolling channel, and subsequently fixed .
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8502120A FR2577652B1 (en) | 1985-02-14 | 1985-02-14 | PROTECTIVE DEVICE AGAINST RAMS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8502120A FR2577652B1 (en) | 1985-02-14 | 1985-02-14 | PROTECTIVE DEVICE AGAINST RAMS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2577652A1 true FR2577652A1 (en) | 1986-08-22 |
| FR2577652B1 FR2577652B1 (en) | 1987-04-03 |
Family
ID=9316275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8502120A Expired FR2577652B1 (en) | 1985-02-14 | 1985-02-14 | PROTECTIVE DEVICE AGAINST RAMS |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2577652B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2717867C1 (en) * | 2019-08-30 | 2020-03-26 | Публичное акционерное общество "Ракетно-космическая корпорация "Энергия" имени С.П. Королева | High-speed flow pneumohydraulic impact damper |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB650196A (en) * | 1948-08-31 | 1951-02-14 | Lucas Ltd Joseph | Means for providing a restricted passage in a fluid conduit |
| US3581773A (en) * | 1969-08-27 | 1971-06-01 | Kenneth H Warren | Device for attenuating pulsation (deadener) |
| FR2109384A5 (en) * | 1970-10-14 | 1972-05-26 | Rhone Poulenc Sa | |
| FR2341764A1 (en) * | 1976-02-20 | 1977-09-16 | Secretary Industry Brit | FLUID FLOW RESTRICTOR |
| US4227551A (en) * | 1978-08-03 | 1980-10-14 | Babcock & Wilcox, Limited | Tube banks |
-
1985
- 1985-02-14 FR FR8502120A patent/FR2577652B1/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB650196A (en) * | 1948-08-31 | 1951-02-14 | Lucas Ltd Joseph | Means for providing a restricted passage in a fluid conduit |
| US3581773A (en) * | 1969-08-27 | 1971-06-01 | Kenneth H Warren | Device for attenuating pulsation (deadener) |
| FR2109384A5 (en) * | 1970-10-14 | 1972-05-26 | Rhone Poulenc Sa | |
| FR2341764A1 (en) * | 1976-02-20 | 1977-09-16 | Secretary Industry Brit | FLUID FLOW RESTRICTOR |
| US4227551A (en) * | 1978-08-03 | 1980-10-14 | Babcock & Wilcox, Limited | Tube banks |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2717867C1 (en) * | 2019-08-30 | 2020-03-26 | Публичное акционерное общество "Ракетно-космическая корпорация "Энергия" имени С.П. Королева | High-speed flow pneumohydraulic impact damper |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2577652B1 (en) | 1987-04-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ST | Notification of lapse |