EP3685045A1 - Positive displacement pump with improved cleaning - Google Patents

Positive displacement pump with improved cleaning

Info

Publication number
EP3685045A1
EP3685045A1 EP18812244.4A EP18812244A EP3685045A1 EP 3685045 A1 EP3685045 A1 EP 3685045A1 EP 18812244 A EP18812244 A EP 18812244A EP 3685045 A1 EP3685045 A1 EP 3685045A1
Authority
EP
European Patent Office
Prior art keywords
pump
cylinder
piston
shaft
zone
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
Application number
EP18812244.4A
Other languages
German (de)
French (fr)
Other versions
EP3685045B1 (en
EP3685045C0 (en
Inventor
Fabrice Bariau
Yann BESNIER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mouvex SAS
Original Assignee
Mouvex SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mouvex SAS filed Critical Mouvex SAS
Publication of EP3685045A1 publication Critical patent/EP3685045A1/en
Application granted granted Critical
Publication of EP3685045B1 publication Critical patent/EP3685045B1/en
Publication of EP3685045C0 publication Critical patent/EP3685045C0/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/0061—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
    • F04C15/0065—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions for eccentric movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/20—Fluid liquid, i.e. incompressible
    • F04C2210/206—Oil
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/22—Fluid gaseous, i.e. compressible
    • F04C2210/221—Air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/60—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2280/00—Arrangements for preventing or removing deposits or corrosion

Definitions

  • the invention relates to the field of pumps, in particular to displacement pumps with eccentric piston. More particularly, the invention relates to a pump comprising means for cleaning in place (CIP) improved.
  • CIP cleaning in place
  • CIP Clean Up
  • Volumetric pumps are among the pumps that can be cleaned by this process.
  • An eccentric piston displacement pump generally comprises a cylinder having a suction opening and sharing an end with a discharge zone. At this end a piston is slidably mounted on the end of a drive shaft and is plated by plating means, such as springs, against the cylinder thereby blocking the fluid passage.
  • the pressure generated by the auxiliary pump enables the piston to be detached from the cylinder and, consequently, the passage of a flow of cleaning liquid.
  • the resistance of the plating means reduces the distance of this detachment thus inducing pressure drops in the installation which prevents the passage of the entire cleaning flow through the pump.
  • eccentric piston displacement pumps comprising a sleeve surrounding the shaft and formed of bellows whose interior remains at atmospheric pressure.
  • a sleeve being subjected externally to the pressure of the cleaning liquid, it exerts a force in the same direction and the same direction as the plating means.
  • the combined action of the plating means and the sleeve on the piston thus further decreases the separation distance between the cylinder and the piston and thereby increases the pressure drop generated by the pump.
  • the object of the present invention is to provide a positive displacement pump for cleaning in place and a method of cleaning such a pump.
  • an eccentric piston displacement pump comprising:
  • a tubular having a first end secured to a transmission zone and a second end terminating in a cylinder integral with a discharge zone, the tubing comprising a suction opening and the discharge zone comprising a discharge opening,
  • a drive shaft extending between the transmission zone and the tubing with a tip located at the cylinder
  • the pump further comprises means for elastically separating the piston from the cylinder and maintaining it at a predetermined distance therefrom.
  • the pump By blocking the piston in the unstuck position of the cylinder, the pump behaves like an open valve and there is no need to install a bypass system. The entire cleaning flow can therefore go from suction to discharge. As a result, the pressure drop becomes very low and CIP cleaning is simplified.
  • the predetermined distance is between 2 and 10 mm.
  • This distance determined experimentally and by simulations as sufficient distance for the entire cleaning flow through the pump. This variation in distance is a function of the size of the pump.
  • the pump further comprises a sleeve arranged in the tubing around the shaft.
  • This sleeve comprises at least one metal bellows, which is fixedly secured by first fixing means to the first end of the tubing and by second attachment means to said end of the shaft, so as to prevent the transmission of fluids from the tubing to the shaft.
  • the means for moving the piston of the cylinder are pneumatic means arranged to pressurize the sleeve.
  • the inner part of the sleeve is pressurized, which makes it possible to take off sufficiently the piston of the cylinder and keep it at a distance from it.
  • the pneumatic means comprise a pressurization pot communicating with the cuff via the zone of transmission, said pressurizing pot comprising an oil and is intended to be connected to a source of compressed air.
  • the pressurizing pot can completely fill the transmission area, it is also partially filled so that the oil level is in the pressurizing pot. Then, by connecting this pressurizing pot to a source of compressed air, the resulting pneumatic pressure acts on this oil surface as on a piston.
  • the volume of oil is transferred from the pressurizing pot to the transmission zone and then to the sleeve. Increasing the volume of the cuff allows it to lengthen and thereby slide the plunger away from the barrel. The distance of this gap can be adjusted by adjusting the pressure in the pressurizing pot.
  • the distance between the cylinder and the piston is also maintained substantially fixed. In this way, when the cleaning liquid is circulated between the suction and the discharge the pressure drop becomes very low.
  • the pressurizing pot comprises restriction means arranged to restrict the passage of fluid from the pot to the transmission zone and vice versa.
  • the restriction means may comprise an oil choke, a controllable solenoid valve.
  • the resilient means fixing the piston at the end of the shaft comprise at least one axial spring.
  • This spring is used to press the piston against the cylinder, especially during the priming phases.
  • the discharge pressure also contributes to the plating of the piston against the cylinder.
  • Such a spring may be formed of a spring washer assembly.
  • the pump comprises at least one stop arranged to protect the axial spring.
  • the pump comprises at least one stop arranged to protect the axial spring.
  • the invention also relates to a method for cleaning a pump according to at least one of the pumps described above in which the means for elastically spacing the cylinder piston are implemented, then a cleaning fluid is circulated. between the suction opening and the discharge opening.
  • Figure 1 shows a longitudinal sectional view of a pump according to a preferred embodiment of the invention
  • Figure 2 shows a zoomed view of the transmission shaft end of a known positive displacement pump
  • FIG. 3 is a view similar to that of FIG. 2 on a pump according to one embodiment of the invention. Detailed
  • Figure 1 shows a pump 1 volumetric eccentric piston according to the invention as seen in longitudinal section.
  • the pump 1 comprises a pipe 2 having a first end 21 and a second end 22 and a suction opening 23.
  • the first end 21 is integral with a transmission zone 3 which comprises transmission means of the pump 1.
  • the second end 22 comprises a cylinder 24 and is integral with a discharge zone 4 which comprises a discharge opening 41.
  • a drive shaft 5 extends from the transmission zone 3 into the pipe 2.
  • the end 53 of the shaft 5 is located at the cylinder 24.
  • a sleeve 8 is arranged in the cylinder 2 around the shaft 5.
  • the sleeve 8 comprises a two-part metal bellows 81, 82, for example steel.
  • the sleeve 8 is secured by first fixing means 83 at the first end 21 of the tubing 2 and by second attachment means 84 at the end 53 of the shaft.
  • first fixing means 83 at the first end 21 of the tubing 2
  • second attachment means 84 at the end 53 of the shaft.
  • Such a cuff is in itself known to those skilled in the art. It is for example described in detail in WO97 / 36107.
  • a piston 6 is arranged in the discharge zone 4 and slidably mounted at the end 53 of the shaft 5 and held by an axial spring 7 which plates it against the cylinder 24 so as to block any displacement of fluid between the pipe 2 and the pipe. discharge area 4.
  • the second fixing means 84 of the sleeve are also integral with the piston and can therefore slide on the end 53 of the shaft 5 at the same time as the piston.
  • the operation of such a pump, except cleaning, is also known to those skilled in the art.
  • the pump When cleaning in place CIP, the pump can be stopped or rotating, an auxiliary pump, not shown, is connected to the suction opening 23 to send a cleaning liquid for the pump and leave the discharge opening 41.
  • the pump 1 comprises means for moving the piston 6 away from the cylinder 2 and keeping it at a predetermined distance from it to allow the cleaning fluid to move between the tubing 2 and the repression 4.
  • the pump according to the invention and as represented by FIG. 1, comprises a pressurization pot 9 communicating with the transmission zone 3.
  • the transmission is filled with lubricating oil to a certain level.
  • pressurizing pot 9 makes it possible to completely fill the transmission zone 3 with oil and the oil level rises to a certain level in the pressurization pot 9.
  • the pressurizing pot 9 is connected to a source of compressed air, not shown.
  • Control means are used to control the pneumatic pressure generated by the compressed air acting on the oil surface as on a piston.
  • the volume of oil is transferred from the pressurization pot to the transmission zone and then to the cuff. Increasing the volume of the cuff allows it to lengthen and slide the piston to move it away from the cylinder. The distance of this gap can be adjusted by adjusting the pressure level in the pressurizing pot.
  • the distance between the cylinder and the piston is also maintained substantially fixed.
  • the cleaning liquid can pass entirely from suction to discharge with a reduced pressure drop.
  • the sufficient distance is dependent on the size of the pump. It is preferably between 2 and 10 mm.
  • the pressurizing pot 9 comprises restriction means 91 for controlling the movement of oil between the pressurizing pot 9 and the transmission zone.
  • the restriction means 91 comprise an oil choke.
  • the restriction means 91 may be different, for example a controllable solenoid valve.
  • the oil passage check makes it possible to keep the piston detached from the cylinder during pressure peaks around the bellows that can be generated during the circulation of the cleaning liquid.
  • Figures 2 and 3 show a zoom on the shaft end 53 respectively in a known pump and in an improved pump according to the invention.
  • the second attachment means 84, 84 ' is integral with the piston 6, the axial spring 71 acts on the end 840, 840' of the second fixing means 84, 84 '. to press the piston 6 against the cylinder 24.
  • the piston 6 and the second fixing means 84 'slide so that the piston 6 away from the cylinder 24.
  • the end 840 ' crushes the turns of the spring, or the washers in the case of spring washers, and can therefore induce their breakage.
  • the pump shown in FIG. 3 provides a stop composed of two parts 72, 73 integral respectively with the end 840 of the second fixing means 84 and the end 53 of the shaft 5.
  • the pump may not have a cuff.
  • the means for moving the piston 6 away from the cylinder 2 and keeping it at a predetermined distance may be different, for example, from the controlled mechanical means.
  • the invention also relates to a method for cleaning a pump 1 according to the invention comprising at least a part of the characteristics described above, wherein the means for elastically moving the piston 6 of the cylinder 24 are implemented, then a cleaning fluid is circulated between the suction opening 23 and the discharge opening 41.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)

Abstract

The invention concerns a positive displacement pump (1) comprising: - a pipe (2) having a first end (21) secured to a transmission area (3) and a second end (22) ending in a cylinder (24) secured to a discharge area (4), the pipe (2) comprising a suction opening (23) and the discharge area comprising a discharge opening (41), - a drive shaft (5) with one end (53) situated at the cylinder (24), - a piston (6) pressed against the cylinder (24) by elastic means (7) so as to prevent fluid from moving between the pipe (2) and the discharge area (4), in which the pump (1) further comprises means (8, 9) for moving the piston elastically away from the cylinder (24) and keeping it at a predetermined distance from same. It also concerns a method for cleaning this pump.

Description

POMPE VOLUMETRIQUE A NETTOYAGE AMELIORE  IMPROVED CLEANING VOLUMETRIC PUMP
Domaine technique Technical area
L'invention se rapporte au domaine des pompes, en particulier aux pompes volumétrique à piston excentré. Plus particulièrement, l'invention porte sur une pompe comprenant des moyens permettant un nettoyage en place (NEP) amélioré.  The invention relates to the field of pumps, in particular to displacement pumps with eccentric piston. More particularly, the invention relates to a pump comprising means for cleaning in place (CIP) improved.
État de la technique State of the art
Dans certains domaines industriels, par exemple l'industrie alimentaire, les pompes sont nettoyées sans démontage. Une pompe annexe envoie un liquide de nettoyage qui travers la pompe. Ce procédé est nommé Nettoyage En Place (NEP) . In certain industrial fields, for example the food industry, the pumps are cleaned without dismantling. An auxiliary pump sends a cleaning fluid through the pump. This process is called Clean Up (CIP).
Les pompes volumétriques sont parmi les pompes susceptibles d'être nettoyées par ce procédé. Volumetric pumps are among the pumps that can be cleaned by this process.
Une pompe volumétrique à piston excentré comprend généralement un cylindre comprenant une ouverture d'aspiration et partageant une extrémité avec une zone de refoulement. Au niveau de cette extrémité un piston est monté coulissant sur le bout d'un arbre d'entrainement et est plaqué par des moyens de plaquage, tels que des ressorts, contre le cylindre bloquant ainsi le passage de fluide. An eccentric piston displacement pump generally comprises a cylinder having a suction opening and sharing an end with a discharge zone. At this end a piston is slidably mounted on the end of a drive shaft and is plated by plating means, such as springs, against the cylinder thereby blocking the fluid passage.
Lors d'un nettoyage NEP la pression générée par la pompe annexe permet de décoller le piston du cylindre et en conséquence le passage d'un débit de liquide de nettoyage. Cependant, la résistance des moyens de plaquage réduit la distance de ce décollement induisant ainsi des pertes de charge dans l'installation qui empêche le passage de l'intégralité du débit de nettoyage à travers la pompe. During CIP cleaning, the pressure generated by the auxiliary pump enables the piston to be detached from the cylinder and, consequently, the passage of a flow of cleaning liquid. However, the resistance of the plating means reduces the distance of this detachment thus inducing pressure drops in the installation which prevents the passage of the entire cleaning flow through the pump.
Cet effet est particulièrement accentué dans les pompes volumétriques à piston excentré comprenant une manchette entourant l'arbre et formées de soufflets dont l'intérieur reste à la pression atmosphérique. Une telle manchette étant soumise extérieurement à la pression du liquide de nettoyage, elle exerce alors un effort dans la même direction et le même sens que les moyens de plaquage. L'action combinée des moyens de plaquage et de la manchette sur le piston diminue donc davantage la distance de décollement entre le cylindre et le piston et augmente de ce fait la perte de charge générée par la pompe. This effect is particularly accentuated in the eccentric piston displacement pumps comprising a sleeve surrounding the shaft and formed of bellows whose interior remains at atmospheric pressure. Such a sleeve being subjected externally to the pressure of the cleaning liquid, it exerts a force in the same direction and the same direction as the plating means. The combined action of the plating means and the sleeve on the piston thus further decreases the separation distance between the cylinder and the piston and thereby increases the pressure drop generated by the pump.
Pour limiter ces pertes de charge, il est généralement nécessaire d' installer un réseau de tuyauterie externe avec une vanne pour dévier une partie du débit de nettoyage qui est supérieur au débit maximum de la pompe. Ceci rend donc l'installation et le nettoyage en place complexes. To limit these pressure drops, it is usually necessary to install an external piping system with a valve to deflect a portion of the cleaning flow that is greater than the maximum flow rate of the pump. This makes installation and cleaning in place complex.
L'objectif de la présente invention est de proposer une pompe volumétrique permettant un nettoyage en place simplifié ainsi qu'un procédé de nettoyage d'une telle pompe. The object of the present invention is to provide a positive displacement pump for cleaning in place and a method of cleaning such a pump.
Description de l ' invention Description of the invention
À cet effet, l'invention a pour objet une pompe volumétrique à piston excentré comprenant : For this purpose, the subject of the invention is an eccentric piston displacement pump comprising:
- Une tubulure présentant une première extrémité solidaire d'une zone de transmission et une deuxième extrémité se terminant par un cylindre solidaire d'une zone de refoulement, la tubulure comprenant une ouverture d' aspiration et la zone de refoulement comprenant une ouverture de refoulement, - A tubular having a first end secured to a transmission zone and a second end terminating in a cylinder integral with a discharge zone, the tubing comprising a suction opening and the discharge zone comprising a discharge opening,
- Un arbre d'entrainement s'étendant entre la zone de transmission et la tubulure avec un bout située au niveau du cylindre, et  A drive shaft extending between the transmission zone and the tubing with a tip located at the cylinder, and
- un piston agencé dans la zone de refoulement et monté coulissant au bout de l'arbre en étant plaqué contre le cylindre par des moyens élastiques de manière à bloquer un déplacement de fluide entre la tubulure et la zone de refoulement . Selon l'invention, la pompe comprend en outre des moyens pour écarter élastiquement le piston du cylindre et le maintenir à une distance prédéterminée de celui-ci. - A piston arranged in the discharge zone and slidably mounted at the end of the shaft being pressed against the cylinder by resilient means so as to block a fluid movement between the tubing and the discharge zone. According to the invention, the pump further comprises means for elastically separating the piston from the cylinder and maintaining it at a predetermined distance therefrom.
En bloquant le piston en position décollée du cylindre, la pompe se comporte comme une vanne ouverte et il n'y plus besoin d'installer un System de dérivation. L'intégralité du débit de nettoyage peut donc passer de l'aspiration au refoulement. En conséquence, la perte de charge devient très faible et le nettoyage NEP est simplifié. By blocking the piston in the unstuck position of the cylinder, the pump behaves like an open valve and there is no need to install a bypass system. The entire cleaning flow can therefore go from suction to discharge. As a result, the pressure drop becomes very low and CIP cleaning is simplified.
Avantageusement, la distance prédéterminée est comprise entre 2 et 10mm. Advantageously, the predetermined distance is between 2 and 10 mm.
Cette distance déterminée expérimentalement et par des simulations comme distance suffisante pour que l'intégralité du débit de nettoyage traverse la pompe. Cette variation de la distance est fonction de la taille de la pompe. This distance determined experimentally and by simulations as sufficient distance for the entire cleaning flow through the pump. This variation in distance is a function of the size of the pump.
Selon un exemple de réalisation, la pompe comprend en outre une manchette agencée dans la tubulure autour de l'arbre. Cette manchette comprend au moins un soufflet métallique, laquelle est fixée étanchement par des premiers moyens de fixation à la première extrémité de la tubulure et par des deuxièmes moyens de fixation audit bout de l'arbre, de manière à empêcher la transmission de fluides de la tubulure vers l'arbre. According to an exemplary embodiment, the pump further comprises a sleeve arranged in the tubing around the shaft. This sleeve comprises at least one metal bellows, which is fixedly secured by first fixing means to the first end of the tubing and by second attachment means to said end of the shaft, so as to prevent the transmission of fluids from the tubing to the shaft.
Avantageusement, les moyens permettant d'écarter le piston du cylindre sont des moyens pneumatiques agencés pour mettre sous pression la manchette. Advantageously, the means for moving the piston of the cylinder are pneumatic means arranged to pressurize the sleeve.
De cette manière, la partie interne de la manchette est mise en pression, ce qui permet de décoller suffisamment le piston du cylindre et le maintenir à distance de lui. In this way, the inner part of the sleeve is pressurized, which makes it possible to take off sufficiently the piston of the cylinder and keep it at a distance from it.
Avantageusement, les moyens pneumatiques comprennent un pot de pressurisation communiquant avec la manchette via la zone de transmission, ledit pot de pressurisation comprenant une huile et est destiné à être relié à une source d'air comprimé. Advantageously, the pneumatic means comprise a pressurization pot communicating with the cuff via the zone of transmission, said pressurizing pot comprising an oil and is intended to be connected to a source of compressed air.
Le pot de pressurisation permet de remplir intégralement la zone de transmission, il est également rempli partiellement de sorte que le niveau d'huile se trouve dans le pot de pressurisation. Ensuite, en branchant ce pot de pressurisation à une source de d'air comprimé, la pression pneumatique résultante agit sur cette surface d'huile comme sur un piston. The pressurizing pot can completely fill the transmission area, it is also partially filled so that the oil level is in the pressurizing pot. Then, by connecting this pressurizing pot to a source of compressed air, the resulting pneumatic pressure acts on this oil surface as on a piston.
Le volume d'huile est donc transféré du pot de pressurisation vers la zone de transmission puis vers la manchette. L'accroissement du volume de la manchette permet de l'allonger et de ce fait de faire coulisser le piston de sorte à l'écarter du cylindre. La distance de cet écartement peut être ajustée en ajustant la pression dans le pot de pressurisation. The volume of oil is transferred from the pressurizing pot to the transmission zone and then to the sleeve. Increasing the volume of the cuff allows it to lengthen and thereby slide the plunger away from the barrel. The distance of this gap can be adjusted by adjusting the pressure in the pressurizing pot.
En outre, en maintenant la pression dans le pot de pressurisation, la distance entre le cylindre et le piston est également maintenu sensiblement fixe. De cette manière, lorsque le liquide de nettoyage est circulé entre l'aspiration et le refoulement la perte de charge devient très faible. In addition, by maintaining the pressure in the pressurizing pot, the distance between the cylinder and the piston is also maintained substantially fixed. In this way, when the cleaning liquid is circulated between the suction and the discharge the pressure drop becomes very low.
Avantageusement, le pot de pressurisation comprend des moyens de restriction agencés pour restreindre le passage de fluide du pot à la zone de transmission et inversement. Advantageously, the pressurizing pot comprises restriction means arranged to restrict the passage of fluid from the pot to the transmission zone and vice versa.
A titre d'exemple, les moyens de restriction peuvent comprendre un étrangleur d'huile, une électrovanne pilotable. By way of example, the restriction means may comprise an oil choke, a controllable solenoid valve.
Cette restriction de passage d'huile vers la transmission et inversement a pour effet de maintenir le piston décollé du cylindre lors de pics de pression autour du soufflet susceptibles d'être générés lors de la circulation du liquide de nettoyage. En effet, ces moyens de restriction permettent un déplacement lent d'huile entre le pot de pressurisation et la zone de transmission, empêchant ainsi tout changement brutal du volume de la manchette. This restriction of passage of oil to the transmission and vice versa has the effect of keeping the piston detached from the cylinder during pressure peaks around the bellows may be generated during the circulation of the cleaning liquid. Indeed, these restriction means allow a slow movement of oil between the pressurizing pot and the transmission zone, thus preventing any sudden change in the volume of the cuff.
Avantageusement, les moyens élastiques fixant le piston au bout de l'arbre comprennent au moins un ressort axial. Ce ressort, sert à plaquer le piston contre le cylindre, en particulier lors des phases d'amorçage. Pendant les phases de pompage, la pression de refoulement contribue également au plaquage du piston contre le cylindre. Advantageously, the resilient means fixing the piston at the end of the shaft comprise at least one axial spring. This spring is used to press the piston against the cylinder, especially during the priming phases. During the pumping phases, the discharge pressure also contributes to the plating of the piston against the cylinder.
Un tel ressort, peut par exemple, être formé d'un ensemble de rondelle ressort. Such a spring, for example, may be formed of a spring washer assembly.
Avantageusement, la pompe comprend au moins une butée agencée pour protéger le ressort axial. En particulier, lors des phases ou la zone de transmission est pressurisée. Advantageously, the pump comprises at least one stop arranged to protect the axial spring. In particular, during the phases where the transmission zone is pressurized.
L' invention porte également sur un procédé de nettoyage d'une pompe conforme aux moins à l'une des pompes décrite précédemment dans lequel les moyens permettant d'écarter élastiquement le piston du cylindre sont mis en œuvre, puis un fluide de nettoyage est circulé entre l'ouverture d'aspiration et l'ouverture de refoulement. The invention also relates to a method for cleaning a pump according to at least one of the pumps described above in which the means for elastically spacing the cylinder piston are implemented, then a cleaning fluid is circulated. between the suction opening and the discharge opening.
Brève description des figures Brief description of the figures
L'invention sera mieux comprise à la lecture de la description qui va suivre, d'exemples de réalisation donnés à titre illustratif, non limitatif, la description faisant référence aux dessins annexés parmi lesquels :  The invention will be better understood on reading the description which follows, examples of embodiments given by way of nonlimiting illustration, the description referring to the appended drawings among which:
la figure 1 représente une vue en coupe longitudinale d'une pompe selon un exemple de réalisation préféré de l'invention ;  Figure 1 shows a longitudinal sectional view of a pump according to a preferred embodiment of the invention;
la figure 2 représente une vue zoomée du bout d' arbre de transmission d'une pompe volumétrique connue ;  Figure 2 shows a zoomed view of the transmission shaft end of a known positive displacement pump;
la figure 3 une vue similaire à celle de la figure 2 sur une pompe conf "orme à un mode de réalisation de 1 ' invention . détaillée FIG. 3 is a view similar to that of FIG. 2 on a pump according to one embodiment of the invention. Detailed
La figure 1 représente une pompe 1 volumétrique piston excentré conforme à l'invention telle que vue en coupe longitudinale .  Figure 1 shows a pump 1 volumetric eccentric piston according to the invention as seen in longitudinal section.
La pompe 1 comprend une tubulure 2 ayant une première extrémité 21 et une deuxième extrémité 22 ainsi qu'une ouverture d'aspiration 23.  The pump 1 comprises a pipe 2 having a first end 21 and a second end 22 and a suction opening 23.
La première extrémité 21 est solidaire d'une zone de transmission 3 qui comprend des moyens de transmission de la pompe 1. La deuxième extrémité 22 comprend un cylindre 24 et est solidaire d'une zone de refoulement 4 qui comprend une ouverture de refoulement 41.  The first end 21 is integral with a transmission zone 3 which comprises transmission means of the pump 1. The second end 22 comprises a cylinder 24 and is integral with a discharge zone 4 which comprises a discharge opening 41.
Un arbre de d'entrainement 5 s'étend de la zone de transmission 3 dans la tubulure 2. Le bout 53 de l'arbre 5 est situé au niveau du cylindre 24.  A drive shaft 5 extends from the transmission zone 3 into the pipe 2. The end 53 of the shaft 5 is located at the cylinder 24.
Comme cela est visible sur la figure 1, dans cet exemple de réalisation, une manchette 8 est agencée dans le cylindre 2 autour de l'arbre 5. La manchette 8 comprend un soufflet métallique en deux parties 81, 82, par exemple en acier. La manchette 8 est fixée étanchement par des premiers moyens de fixation 83 à la première extrémité 21 de la tubulure 2 et par des deuxièmes moyens de fixation 84 au bout 53 de l'arbre. Une telle manchette est en soi connue de l'Homme du métier. Elle est par exemple décrite en détail dans le document WO97/36107.  As shown in Figure 1, in this embodiment, a sleeve 8 is arranged in the cylinder 2 around the shaft 5. The sleeve 8 comprises a two-part metal bellows 81, 82, for example steel. The sleeve 8 is secured by first fixing means 83 at the first end 21 of the tubing 2 and by second attachment means 84 at the end 53 of the shaft. Such a cuff is in itself known to those skilled in the art. It is for example described in detail in WO97 / 36107.
Un piston 6 est agencé dans la zone de refoulement 4 et monté coulissant au bout 53 de l'arbre 5 et maintenu par un ressort axial 7 qui le plaque contre le cylindre 24 de manière à bloquer tout déplacement de fluide entre la tubulure 2 et la zone de refoulement 4.  A piston 6 is arranged in the discharge zone 4 and slidably mounted at the end 53 of the shaft 5 and held by an axial spring 7 which plates it against the cylinder 24 so as to block any displacement of fluid between the pipe 2 and the pipe. discharge area 4.
Les deuxièmes moyens de fixation 84 de la manchette, sont également solidaires du piston et peuvent donc coulisser sur le bout 53 de l'arbre 5 en même temps que le piston. Le fonctionnement d'une telle pompe, hors nettoyage, est également connu de l'Homme du métier. The second fixing means 84 of the sleeve are also integral with the piston and can therefore slide on the end 53 of the shaft 5 at the same time as the piston. The operation of such a pump, except cleaning, is also known to those skilled in the art.
Lors d'un nettoyage en place NEP, la pompe pouvant être à l'arrêt ou en rotation, une pompe annexe, non représentée, est branchée à l'ouverture d'aspiration 23 pour envoyer un liquide de nettoyage destiné à travers la pompe et sortir de l'ouverture de refoulement 41.  When cleaning in place CIP, the pump can be stopped or rotating, an auxiliary pump, not shown, is connected to the suction opening 23 to send a cleaning liquid for the pump and leave the discharge opening 41.
Comme expliqué ci-dessus, avec les méthodes de nettoyage classiques, des pertes de charge sont dues à l'action du ressort axial 7 et du soufflet 8 limitant le déplacement du piston 6 par rapport au cylindre 2 sous l'effet de la pression du liquide de nettoyage . As explained above, with conventional cleaning methods, pressure losses are due to the action of the axial spring 7 and the bellows 8 limiting the displacement of the piston 6 relative to the cylinder 2 under the effect of the pressure of the cleaning liquid.
Pour résoudre ce problème, la pompe 1 selon l'invention comprend des moyens pour écarter le piston 6 du cylindre 2 et le maintenir à une distance prédéterminé de celui-ci pour permettre un déplacement du fluide de nettoyage entre la tubulure 2 et la zone de refoulement 4.  To solve this problem, the pump 1 according to the invention comprises means for moving the piston 6 away from the cylinder 2 and keeping it at a predetermined distance from it to allow the cleaning fluid to move between the tubing 2 and the repression 4.
Plus particulièrement, la pompe selon l'invention et telle que représentée par la figure 1, comprend un pot de pressurisation 9 communiquant avec la zone de transmission 3. More particularly, the pump according to the invention and as represented by FIG. 1, comprises a pressurization pot 9 communicating with the transmission zone 3.
Dans les pompes connues, la transmission est rempli d'huile de lubrification jusqu'à un certain niveau.  In known pumps, the transmission is filled with lubricating oil to a certain level.
L'ajout du pot de pressurisation 9 à la pompe 1 permet de remplir intégralement la zone de transmission 3 en huile et le niveau d'huile remonte jusqu'à un certain niveau dans le pot de pressurisation 9.  The addition of the pressurizing pot 9 to the pump 1 makes it possible to completely fill the transmission zone 3 with oil and the oil level rises to a certain level in the pressurization pot 9.
Lors d'un nettoyage NEP de la pompe, le pot de pressurisation 9 est branché à une source d'air comprimé, non représentée. Des moyens de contrôle permettent de contrôler la pression pneumatique générée par l'air comprimé qui agit sur la surface d'huile comme sur un piston.  During CIP cleaning of the pump, the pressurizing pot 9 is connected to a source of compressed air, not shown. Control means are used to control the pneumatic pressure generated by the compressed air acting on the oil surface as on a piston.
Le volume d'huile est donc transféré du pot de pressurisation vers la zone de transmission puis vers la manchette. L'accroissement du volume de la manchette permet de l'allonger et faire coulisser le piston pour l'écarter du cylindre. La distance de cet écartement peut être ajustée en ajustant le niveau de pression dans le pot de pressurisation . The volume of oil is transferred from the pressurization pot to the transmission zone and then to the cuff. Increasing the volume of the cuff allows it to lengthen and slide the piston to move it away from the cylinder. The distance of this gap can be adjusted by adjusting the pressure level in the pressurizing pot.
En outre, en maintenant la pression dans le pot de pressurisation, la distance entre le cylindre et le piston est également maintenu sensiblement fixe. In addition, by maintaining the pressure in the pressurizing pot, the distance between the cylinder and the piston is also maintained substantially fixed.
Ainsi, le liquide de nettoyage peut passer intégralement de l'aspiration au refoulement avec une perte de charge réduite. Thus, the cleaning liquid can pass entirely from suction to discharge with a reduced pressure drop.
La distance suffisante est dépendante de la taille de la pompe. Elle se situe de préférence entre 2 et 10 mm. The sufficient distance is dependent on the size of the pump. It is preferably between 2 and 10 mm.
En outre, le pot de pressurisation 9 comprend des moyens de restriction 91 permettant de contrôler le déplacement d'huile entre le pot de pressurisation 9 et la zone de transmission. In addition, the pressurizing pot 9 comprises restriction means 91 for controlling the movement of oil between the pressurizing pot 9 and the transmission zone.
Dans, l'exemple de la figure 1, les moyens de restriction 91 comprennent un étrangleur d'huile. In the example of FIG. 1, the restriction means 91 comprise an oil choke.
Dans des variantes non illustrées, les moyens de restriction 91 peuvent être différents, par exemple une électrovanne pilotable. In non-illustrated variants, the restriction means 91 may be different, for example a controllable solenoid valve.
Le contrôle de passage d'huile permet de maintenir le piston décollé du cylindre lors de pics de pression autour du soufflet susceptibles d'être générés lors de la circulation du liquide de nettoyage. The oil passage check makes it possible to keep the piston detached from the cylinder during pressure peaks around the bellows that can be generated during the circulation of the cleaning liquid.
Les figures 2 et 3 représentent un zoom sur le bout 53 d' arbre 5 respectivement dans une pompe connue et dans une pompe améliorée selon l'invention. Figures 2 and 3 show a zoom on the shaft end 53 respectively in a known pump and in an improved pump according to the invention.
Comme cela se voit sur les figures 2, 3 le deuxième moyens de de fixation 84, 84', est solidaire du piston 6, le ressort axial 71 agit sur l'extrémité 840, 840' du deuxième moyens de de fixation 84, 84' pour plaquer le piston 6 contre le cylindre 24. Dans le cas de la figure 2, lorsque le volume de la manchette 8 augmente, le piston 6 et le deuxième moyen de fixation 84' coulissent de sorte que le piston 6 s'écarte du cylindre 24. Sous l'effet de la pression qui augmente dans la manchette, l'extrémité 840' écrase les spires du ressort, ou les rondelles dans le cas de rondelles ressort, et peut donc induire leur cassure . As can be seen in FIGS. 2 and 3, the second attachment means 84, 84 'is integral with the piston 6, the axial spring 71 acts on the end 840, 840' of the second fixing means 84, 84 '. to press the piston 6 against the cylinder 24. In the case of Figure 2, when the volume of the sleeve 8 increases, the piston 6 and the second fixing means 84 'slide so that the piston 6 away from the cylinder 24. Under the effect of the pressure that increases in the cuff, the end 840 'crushes the turns of the spring, or the washers in the case of spring washers, and can therefore induce their breakage.
Pour protéger, le ressort 71 de la cassure, la pompe représentée en figure 3 prévoit une butée composée de deux parties 72, 73, solidaires respectivement de l'extrémité 840 du deuxième moyen de fixation 84 et du bout 53 de l'arbre 5. Ainsi, lorsque les deux parties 72, 73 de la butée sont en contact, le déplacement piston est stoppé et la pression sur le ressort n'augmente pas. To protect the spring 71 of the break, the pump shown in FIG. 3 provides a stop composed of two parts 72, 73 integral respectively with the end 840 of the second fixing means 84 and the end 53 of the shaft 5. Thus, when the two parts 72, 73 of the abutment are in contact, the piston movement is stopped and the pressure on the spring does not increase.
L'invention n'est évidemment pas limitée aux exemples illustrés. Dans des variantes non représentés, la pompe peut ne pas comporter de manchette. Les moyens pour écarter le piston 6 du cylindre 2 et le maintenir à une distance prédéterminée peuvent être différents, par exemple, des moyens mécaniques commandés . The invention is obviously not limited to the illustrated examples. In variants not shown, the pump may not have a cuff. The means for moving the piston 6 away from the cylinder 2 and keeping it at a predetermined distance may be different, for example, from the controlled mechanical means.
L' invention porte également sur un procédé de nettoyage d'une pompe 1 selon l'invention comprenant au moins une partie des caractéristiques décrites ci-dessus, dans lequel les moyens permettant d'écarter élastiquement le piston 6 du cylindre24 sont mis en œuvre, puis un fluide de nettoyage est circulé entre l'ouverture d'aspiration 23 et l'ouverture de refoulement 41.  The invention also relates to a method for cleaning a pump 1 according to the invention comprising at least a part of the characteristics described above, wherein the means for elastically moving the piston 6 of the cylinder 24 are implemented, then a cleaning fluid is circulated between the suction opening 23 and the discharge opening 41.

Claims

REVENDICATIONS
1. Pompe (1) volumétrique à piston excentré comprenant : An eccentric piston displacement pump (1) comprising:
Une tubulure (2) présentant une première extrémité (21) solidaire d'une zone de transmission (3) et une deuxième extrémité (22) se terminant par un cylindre (24) solidaire d'une zone de refoulement (4), la tubulure (2) comprenant une ouverture d'aspiration (23) et la zone de refoulement comprenant une ouverture de refoulement (41),  A tubing (2) having a first end (21) integral with a transmission zone (3) and a second end (22) terminating in a cylinder (24) integral with a discharge zone (4), the tubing (2) comprising a suction opening (23) and the discharge zone comprising a discharge opening (41),
Un arbre d'entrainement (5) s'étendant entre la zone de transmission 3 et la tubulure avec un bout (53) située au niveau du cylindre (24),  A drive shaft (5) extending between the transmission zone 3 and the pipe with a tip (53) located at the cylinder (24),
un piston (6) agencé dans la zone de refoulement (4) et monté coulissant au bout (53) de l'arbre (5) en étant plaqué contre le cylindre (24) par des moyens élastiques (7) de manière à bloquer un déplacement de fluide entre la tubulure (2) et la zone de refoulement (4), caractérisée en ce que la pompe (1) comprend en outre des moyens (8, 9) pour écarter élastiquement le piston du cylindre (24) et le maintenir à une distance prédéterminé de celui-ci.  a piston (6) arranged in the delivery zone (4) and slidably mounted at the end (53) of the shaft (5) being pressed against the cylinder (24) by elastic means (7) so as to block a fluid displacement between the pipe (2) and the discharge zone (4), characterized in that the pump (1) further comprises means (8, 9) for elastically separating the cylinder piston (24) and maintaining it at a predetermined distance from it.
2. Pompe (1) selon la revendication 1, où ladite distance prédéterminée est comprise entre 2mm et 10mm. 2. Pump (1) according to claim 1, wherein said predetermined distance is between 2mm and 10mm.
3. Pompe (1) selon l'une des revendication 1 ou 2, comprenant en outre une manchette (8) agencée dans la tubulure (2) autour de l'arbre (5) et comprenant au moins un soufflet métallique (81, 82), laquelle est fixée étanchement par des premiers moyens de fixation (83) à la première extrémité (21) de la tubulure (2) et par des deuxièmes moyens de fixation (84) audit bout (53) de l'arbre, de manière à empêcher la transmission de fluides de la tubulure (2) vers l'arbre (5) . 3. Pump (1) according to one of claims 1 or 2, further comprising a sleeve (8) arranged in the tubing (2) around the shaft (5) and comprising at least one metal bellows (81, 82 ), which is secured by first fastening means (83) to the first end (21) of the pipe (2) and by second fastening means (84) to said end (53) of the shaft, to prevent the transmission of fluids from the tubing (2) to the shaft (5).
4. Pompe (1) selon la revendication 3, dans laquelle les moyens permettant d'écarter le piston (6) du cylindre (24) sont des moyens pneumatiques (9) agencés pour mettre sous pression la manchette ( 8 ) . 4. Pump (1) according to claim 3, wherein the means for moving the piston (6) of the cylinder (24) are pneumatic means (9) arranged to pressurize the sleeve (8).
5. Pompe (1) selon la revendication 4, dans laquelle les moyens pneumatiques comprennent un pot de pressurisation (9) communiquant avec la manchette via la zone de transmission (3), ledit pot de pressurisation (9) comprend une huile et est destiné à être relié à une source d'air comprimé. 5. Pump (1) according to claim 4, wherein the pneumatic means comprise a pressurizing pot (9) communicating with the sleeve via the transmission zone (3), said pressurizing pot (9) comprises an oil and is intended to to be connected to a source of compressed air.
6. Pompe (1) selon la revendication 5, dans laquelle le pot de pressurisation (9) comprend des moyens de restriction (91) agencés pour restreindre le passage de fluide du pot à la zone de transmission et inversement. 6. Pump (1) according to claim 5, wherein the pressurizing pot (9) comprises restriction means (91) arranged to restrict the passage of fluid from the pot to the transmission zone and vice versa.
7. Pompe (1) selon la revendication 6, dans laquelle les moyens de restriction (91) comprennent un étrangleur d'huile. 7. Pump (1) according to claim 6, wherein the restriction means (91) comprises an oil choke.
8. Pompe (1) selon l'une des revendications 1 à 7 dans laquelle les moyens élastiques fixant le piston (6) au bout (53) de l'arbre (5) comprennent au moins un ressort axial (71) . 8. Pump (1) according to one of claims 1 to 7 wherein the resilient means fixing the piston (6) at the end (53) of the shaft (5) comprise at least one axial spring (71).
9. Pompe (1) selon la revendication 8, comprenant au moins une butée (72, 73) agencée pour protéger le ressort axial. 9. Pump (1) according to claim 8, comprising at least one stop (72, 73) arranged to protect the axial spring.
10. Procédé de nettoyage d'une pompe selon l'une quelconque des revendications 1 à 9 dans lequel les moyens permettant d'écarter élastiquement le piston (6) du cylindre (24) sont mis en œuvre, puis un fluide de nettoyage est circulé entre l'ouverture d'aspiration (23) et l'ouverture de refoulement (41) . 10. A method of cleaning a pump according to any one of claims 1 to 9 wherein the means for resiliently spacing the piston (6) of the cylinder (24) are implemented, then a cleaning fluid is circulated. between the suction opening (23) and the discharge opening (41).
EP18812244.4A 2017-12-14 2018-11-07 Positive displacement pump with improved cleaning Active EP3685045B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1762157A FR3075280B1 (en) 2017-12-14 2017-12-14 IMPROVED CLEANING VOLUMETRIC PUMP
PCT/FR2018/052748 WO2019115890A1 (en) 2017-12-14 2018-11-07 Positive displacement pump with improved cleaning

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EP3685045A1 true EP3685045A1 (en) 2020-07-29
EP3685045B1 EP3685045B1 (en) 2023-06-07
EP3685045C0 EP3685045C0 (en) 2023-06-07

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US (1) US11319955B2 (en)
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JP (1) JP7227972B2 (en)
CN (1) CN111295517B (en)
CA (1) CA3084497A1 (en)
ES (1) ES2950566T3 (en)
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WO (1) WO2019115890A1 (en)

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FR3093140B1 (en) * 2019-02-26 2022-05-06 Mouvex Positive displacement eccentric piston pump

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Publication number Priority date Publication date Assignee Title
US1497050A (en) * 1923-10-25 1924-06-10 Hill Compressor & Pump Company Rotary pump
GB1255799A (en) * 1967-12-18 1971-12-01 Krauss Maffei Ag Rotary positive fluid displacement apparatus
US3671143A (en) * 1970-11-05 1972-06-20 Trw Inc Flat side valve for pressure balanced power steering pump with improved aspirator action
FR2153129B2 (en) * 1971-06-01 1974-01-04 Vulliez Paul
DE3671503D1 (en) * 1985-02-27 1990-06-28 Gutag Innovations Ag DISPLACEMENT MACHINE, IN PARTICULAR PUMP.
JPH02277951A (en) * 1989-04-18 1990-11-14 Matsushita Electric Ind Co Ltd Seal device
FR2746452B1 (en) * 1996-03-22 1998-04-24 Mouvex SEALED ROTARY DRIVE DEVICE WITH ECCENTRICITY, ESPECIALLY FOR A VOLUMETRIC PUMP
JP3366876B2 (en) * 1999-04-08 2003-01-14 株式会社ナカキン Rotary pump
KR100482138B1 (en) * 2002-11-22 2005-04-14 현대자동차주식회사 self-purifying apparatus of shock absorber
US6884047B1 (en) * 2003-10-20 2005-04-26 Varian, Inc. Compact scroll pump
CN202768717U (en) * 2012-09-18 2013-03-06 浙江名震机械制造有限公司 Self-cleaning damper

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ES2950566T3 (en) 2023-10-11
US20200386226A1 (en) 2020-12-10
EP3685045B1 (en) 2023-06-07
CA3084497A1 (en) 2019-06-20
BR112020007446A2 (en) 2020-10-27
FR3075280A1 (en) 2019-06-21
CN111295517A (en) 2020-06-16
FR3075280B1 (en) 2019-11-22
CN111295517B (en) 2022-05-10
US11319955B2 (en) 2022-05-03
JP2021507160A (en) 2021-02-22
JP7227972B2 (en) 2023-02-22
WO2019115890A1 (en) 2019-06-20
EP3685045C0 (en) 2023-06-07

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