WO2022058593A1 - Progressive cavity pump and pumping device - Google Patents

Progressive cavity pump and pumping device Download PDF

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Publication number
WO2022058593A1
WO2022058593A1 PCT/EP2021/075824 EP2021075824W WO2022058593A1 WO 2022058593 A1 WO2022058593 A1 WO 2022058593A1 EP 2021075824 W EP2021075824 W EP 2021075824W WO 2022058593 A1 WO2022058593 A1 WO 2022058593A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission mechanism
rotor
sheath
progressive cavity
cavity pump
Prior art date
Application number
PCT/EP2021/075824
Other languages
French (fr)
Inventor
David Franck Christian RÉTHORÉ
Robin Gérard GAUVRIT
Jérémy Sylvain Dany THOMAS
Fabrice Jacques GOUDROT
Guillaume Philippe PIETTE
Original Assignee
Pcm Technologies
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 Pcm Technologies filed Critical Pcm Technologies
Publication of WO2022058593A1 publication Critical patent/WO2022058593A1/en

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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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
    • F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
    • 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
    • F04C13/00—Adaptations of machines or pumps for special use, e.g. for extremely high pressures
    • F04C13/001—Pumps for particular liquids
    • 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
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/28—Safety arrangements; Monitoring
    • 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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C15/0038—Shaft sealings specially adapted for rotary-piston machines or pumps
    • 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
    • F04C15/0073—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
    • F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
    • F16D3/843—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers
    • F16D3/845—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers allowing relative movement of joint parts due to the flexing of the cover
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/04—Bellows
    • F16J3/041—Non-metallic bellows
    • F16J3/042—Fastening details
    • 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
    • F04C2240/80—Other components
    • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2251/00—Material properties
    • F05C2251/02—Elasticity

Definitions

  • TITLE Progressive cavity pump and pumping device
  • the invention relates to the field of pumping devices and in particular progressive cavity pumps used in the food industry.
  • An object of the present invention is to provide a less expensive progressive cavity pump, which meets the hygiene standards of the food industry.
  • this pump must guarantee perfect sealing between the zone in contact with the food product and the zones out of contact with food, which may contain, for example, lubricants to lubricate the drive parts.
  • Means for identifying a sealing defect must also be implemented in the design of the pump. Indeed, the pumped liquid must not contain toxic substances because it will be ingested by people. In addition, this pump must be able to fit into an industrial fluid transfer or dosing process, which requires that it can withstand pressure in all parts of the pump.
  • the invention proposes a progressive cavity pump for pumping an agrifood liquid, the progressive cavity pump comprising a stator, a helical rotor arranged in the stator and a drive device, the training including:
  • the primary sheath prevents the pumped liquid from coming into contact with the greases lubricating the transmission mechanism so that it is not soiled.
  • the intermediate chamber is suitable for recovering pumped liquid when the seal between the rotor and the secondary sheath is defective.
  • the recovery chamber makes it possible to isolate the liquid which could be contaminated from the pumped liquid which is transported by the progressive cavity pump.
  • the progressive cavity pump comprises one or more of the following characteristics.
  • the housing further comprises a storage cavity, the frame being provided with an opening allowing the flow of liquid from the recovery chamber to the storage cavity.
  • the pump further comprises a sensor able to detect the presence of liquid and to transmit an alert signal in the event of the presence of liquid, said sensor being arranged in the storage cavity.
  • the drive device comprises a cap comprising a bottom having a central opening and a peripheral rim, the cap comprising at least one groove extending radially on an outer face of the bottom and extending on an outer face of the flange, the flange fixing by wedging a part of the primary sheath against the transmission mechanism.
  • the groove recovers the pumped liquid and brings it back inside the recovery chamber when the secondary sheath is defective.
  • the cap makes it possible to fix the primary sheath to the transmission mechanism.
  • the armature comprises a hollow cylinder and a hollow tube housed in the cylinder, and in which the secondary sheath is fixed by wedging between the cylinder and the tube.
  • this assembly allows solid and hygienic attachment of the secondary sheath to the frame.
  • this assembly is easy to disassemble.
  • the cylinder can be slid on the tube so as to release one end of the secondary sheath.
  • the cylinder comprises an inner face, an annular edge and a recess, the recess being open on a part of the inner face of the cylinder and on a part of the annular edge of the cylinder, the recess having a thickness less than the thickness of the secondary sheath, an end portion of the secondary sheath being housed and wedged in said recess.
  • an inner face of the secondary sheath comprises a annular bead, and in which the outer face of the tube is provided with an annular groove, the bead of the secondary sheath being housed in the groove of the tube.
  • the bead and groove assembly provide sealing between the reinforcement and the secondary sheath.
  • an outer face of the secondary sheath comprises an annular bulge, the recess of the cylinder being provided with an annular groove, the bulge of the secondary sheath being housed in the groove of the cylinder.
  • the rotor comprises an end face extending perpendicular to the axis of rotation, said end face comprising an annular groove
  • the secondary sheath comprises a sleeve having an axis of symmetry and an annular wall extending perpendicular to the axis of symmetry, an outer face of the annular wall has an annular projection, the projection is housed in the groove of the rotor to improve the seal between the rotor and the transmission mechanism.
  • the transmission mechanism comprises a side face extending in a plane perpendicular to the axis of rotation, and in which said side face comprises a first recess, the annular wall of the secondary sheath being mounted in said first dropout.
  • the transmission mechanism comprises a side face extending in a plane perpendicular to the axis of rotation, and in which said side face of the transmission mechanism comprises a second recess, the cap being arranged in said second setback.
  • the invention also relates to a drive device intended for a pump with progressive cavities for pumping an agrifood liquid comprising a stator, a helical rotor arranged in the stator, the drive device comprising:
  • FIG. 1 is a side view of a progressive cavity pump according to the invention
  • FIG. 2 is a sectional view of the progressive cavity pump illustrated in FIG. 1 along a vertical section plane;
  • FIG. 3 is a front view of a cap of the progressive cavity pump shown in Figure 1;
  • FIG. 4 is a side view of the cap shown in Figure 3;
  • FIG. 5 is a perspective view of a primary sheath mounted in the progressive cavity pump shown in Figure 1;
  • FIG. 6 is a sectional view of the primary sheath shown in Figure 5 along a sectional plane shown in Figure 5;
  • FIG. 7 is a perspective view of the end of the rotor
  • FIG. 8 is an enlargement of figure 2.
  • the progressive cavity pump 2 comprises a stator 4, a helical rotor 6 housed in the stator, a drive device 8, and a discharge pipe 10.
  • a part rotor and stator have been truncated in Figures 1 and 2.
  • the rotor 6 has an end face 12 provided with a threaded bore 14 and an annular groove 16 encircling the bore.
  • the end face 12 extends in a plane substantially perpendicular to the axis of rotation of the rotor.
  • the drive device 8 comprises a casing 18 and a suction pipe 20.
  • the casing 18 defines an interior chamber.
  • the housing 18 comprises an opening on which the suction line is fixed, two channels 22, a right side face 24 open and a left side face 26 open.
  • the channels 22 are contained in the same radial plane. They are aligned. They extend vertically.
  • the left side face 26 is fixed to the stator by a clamping collar.
  • the right side face 24 is traversed by a drive shaft 27 capable of being driven in rotation around an axis of rotation AA by a motor, not shown.
  • the right side face 24 is closed.
  • the drive device 8 further comprises a first transmission mechanism 28 mechanically connected to the rotor, an intermediate drive shaft 30 mechanically connected to the first transmission mechanism, a second transmission mechanism 32 mechanically connected to the drive shaft intermediate and to the drive shaft 27.
  • the shaft intermediate drive, the first and second transmission mechanisms are located in the inner chamber.
  • the first transmission mechanism and the second transmission mechanism are, for example, constituted by gimbals. They make it possible to pivot the rotor according to an eccentric movement from a concentric movement transmitted by the drive shaft 27.
  • the first transmission mechanism 28 comprises a side face 34 which extends substantially perpendicular to the axis of rotation A-A.
  • the side face 34 comprises a threaded central shaft 36, an annular face 38 forming a shoulder, a first recess 40 and a second recess 42 more distant from the shaft than the first recess.
  • the central shaft 36 is arranged in the bore 14 of the rotor.
  • other methods of fixing can be implemented.
  • the second transmission mechanism 32 comprises a bore.
  • the drive shaft 27 comprises a rod fitted into the bore of the second transmission mechanism.
  • One or more fixing screws 44 secure the rod of the shaft 27 to the second transmission mechanism.
  • the screw(s) 44 extend(s) radially.
  • other methods of fixing can be implemented.
  • the drive device 8 also comprises a hollow armature 46, an annular bearing 48 mounted between the casing 18 and the armature, a sensor 49 and a sealing device 50 arranged between the casing and the armature.
  • the armature 46 is capable of being driven in rotation by the drive shaft 27. It consists of a hollow cylinder 52 and a hollow tube 54 housed in the cylinder. The cylinder, the tube and the second transmission mechanism 32 are fixed to each other. This fixing is for example carried out by the fixing screw(s) 44 and by one or more additional fixing screw(s) 45.
  • the armature 46 comprises an opening 55 allowing the passage of liquid, as explained later.
  • the cylinder 52 comprises an interior face 56, an annular edge 58 and a recess 60.
  • the recess 60 is open on a part of the interior face of the cylinder and on a part of the annular edge of the cylinder.
  • the recess 60 is provided with an annular groove 62.
  • the outer face of the edge of the tube is also provided with an annular groove 64.
  • the annular bearing 48 divides the inner chamber into two chambers isolated from each other.
  • a chamber is located on the side of the rotor. It is called “suction chamber 66” in this patent application.
  • the suction line 20, the channels 22 and the side face 24,26 open into the suction chamber.
  • a cavity is located on the side of the drive shaft. It is called “storage cavity 68” in the present patent application.
  • the sensor 49 is housed in the storage cavity 68. It is capable of detecting the presence of liquid and to transmit an alert signal in the event of the presence of liquid, as explained later.
  • the sealing device 50 ensures airtightness between the suction chamber containing the pumped liquid and the storage cavity.
  • the sealing device is fixed next to the annular bearing 48 on the side of the suction chamber.
  • the sealing device comprises a dynamic sealing ring 70, a spacer ring 72 arranged beside and to the right of the dynamic sealing ring, and a dynamic sealing ring 74 located beside and to the right of the spacer ring.
  • the spacer ring 72 comprises several passages 76 extending along a radial axis of the ring.
  • the spacer ring 72 is arranged in the casing so that each passage 76 is positioned in line with a channel 22 of the casing.
  • a sensor 80 can be arranged in the channel 22 of the casing or below the latter. This sensor will be able to detect the presence of liquid and transmit an alert signal to users in the event of the presence of liquid.
  • This sensor is shown schematically in Figure 2.
  • the sensor 80 is also useful when it is dangerous and cannot afford to have a puddle of product on the ground (eg radioactive, chemical product, etc.) . The pump must then be stopped on the first detection of a leaking fluid as a safety measure.
  • the casing 18 and the spacer ring 72 comprise a single channel and respectively a single passage located in the lower part of the progressive cavity pump.
  • the drive device 8 further comprises two primary sheaths 82, a cap 84 and a secondary sheath 86 fixed on the one hand, to the armature 46, and on the other hand, to the rotor and to the first transmission mechanism 28.
  • the primary sheaths 82 are made of elastomer.
  • the primary sleeves create protective envelopes around the transmission mechanisms 28, 32. They prevent the greases surrounding the transmission mechanisms from mixing with the pumped liquid in the event of a leak and rupture of the secondary sleeve 86.
  • the primary sheaths 82 have the general shape of a sleeve.
  • the primary sheaths comprise a first cylindrical portion and a second portion cylindrical of smaller diameter than the first cylindrical portion.
  • the first cylindrical portion is connected to the second cylindrical portion.
  • the first cylindrical portion has a length substantially equal to the length of a transmission mechanism.
  • the inner face of the primary sheath has an annular bead at each of its ends.
  • the intermediate drive shaft 30 has an annular groove in which an annular bead is housed.
  • One edge of the transmission mechanism has an annular groove housing the other annular bead.
  • a clamp secures one end of the primary sheath against the intermediate drive shaft 30.
  • the clamp is arranged around the edge of the primary sheath substantially in the same radial plane as the bead and the groove.
  • the cap 84 is mounted on the first transmission mechanism 28 and caps the edge of the primary sheath.
  • the cap 84 plates and fixes by wedging this end of the primary sheath against the first transmission mechanism.
  • the cap 84 includes a bottom 88 having a central opening and a rim 90 device.
  • the cap is fitted onto the side face of the first transmission mechanism.
  • the shaft 36 of the first transmission mechanism passes through the central opening.
  • the bottom 88 is housed in the second recess 42.
  • the cap 84 includes two grooves 92 extending radially on an outer face of the bottom and extending longitudinally on an outer face of the flange 90. Preferably, the two grooves 92 are aligned along a diameter of the bottom. In the event of a malfunction in the seal between the rotor 8 and the secondary sheath 86, the grooves allow the flow of liquid pumped from the suction chamber 66 to a recovery chamber 94, as explained in the operation described below. .
  • the cap includes a single groove.
  • the secondary sheath 86 is made of flexible material such as elastomer for example. It includes a sleeve 96 and an annular wall 98 formed at one end of the sleeve.
  • Sleeve 96 has an X-X axis of symmetry.
  • the annular wall 98 extends perpendicular to the axis of symmetry X-X.
  • An outer face 100 of the annular wall has an annular projection 102.
  • the secondary sheath 86 is fitted onto the cap.
  • the shaft 36 of the transmission mechanism passes through the hole in the center of the annular wall.
  • the annular wall 98 is housed in the first recess 40.
  • the end face 12 of the rotor bears against the side face 34 of the transmission mechanism.
  • the projection 102 is housed in the groove 16 of the rotor to improve the seal between the rotor and the first transmission mechanism.
  • This recess 60 has a thickness slightly less than the thickness of the sheath secondary 86 so that the secondary sheath is fixed to the frame 46 by wedging between the inner wall of the cylinder recess and the outer face of the tube.
  • the inner face 103 of the sleeve of the secondary sheath comprises at its end an annular bead 104.
  • the bead 104 is housed in the groove 64 of the tube.
  • the bead 104 and groove 64 assembly improves the seal between the secondary sheath 86 and the tube 54.
  • the outer face of the sleeve of the secondary sheath comprises an annular bulge 106.
  • the bulge 106 is housed in the groove 62 of the cylinder.
  • the bulge 106 and groove 62 assembly improves the seal between the secondary sheath 86 and the cylinder 52.
  • the primary sheaths 82, the secondary sheath 86 and the armature 46 define a recovery chamber 94.
  • intermediate drive shaft 30 and the transmission mechanisms 28, 32 are replaced by a universal joint.
  • the two primary sheaths 82 are replaced by a single sheath covering the two gimbals.
  • the pumped fluid is sucked up by the suction pipe, transported by rotation of the rotor 8 in the stator 4, then is rejected by the discharge pipe 10.
  • the recovery chamber 94 recovers the liquid which is introduced between the secondary sheath and the first transmission mechanism.
  • the cap 84 guides this liquid towards the recovery chamber 94.
  • This liquid then flows through the opening 51 of the armature towards the storage cavity 68.
  • the sensor 49 detects the presence of liquid and transmits an alert signal to users.
  • users are informed of the fact that the seal between the secondary sheath and the rotor is imperfect. They can launch a maintenance operation to change the secondary sheath.
  • this pump with progressive cavities makes it possible to avoid contaminating the pumped liquid with fats or oils for a modest cost since it is thus not necessary to make the drive parts in materials suitable for contact with food.

Abstract

The invention relates to a progressive cavity pump (2) for pumping an agrifood liquid, the progressive cavity pump comprising a stator, a helical rotor and a drive device (8) comprising: - a casing (18) defining a suction chamber, - a drive shaft (27, 30) which is rotated, - a reinforcement (46) rotated by the drive shaft, - a transmission mechanism (28) attached to the rotor and to the drive shaft, - a primary sheath (82) surrounding the transmission mechanism, - a secondary sheath (86) attached, on the one hand, to the rotor and to the transmission mechanism and, on the other hand, to the reinforcement (46); the primary sheath, the secondary sheath and the reinforcement defining a recovery chamber capable of recovering pumped liquid when the seal between the secondary sheath and the rotor is defective.

Description

DESCRIPTION DESCRIPTION
TITRE : Pompe à cavités progressives et dispositif de pompage TITLE: Progressive cavity pump and pumping device
Domaine technique de l’invention Technical field of the invention
L’invention concerne le domaine des dispositifs de pompage et en particulier des pompes à cavités progressives utilisées dans l’industrie agroalimentaire. The invention relates to the field of pumping devices and in particular progressive cavity pumps used in the food industry.
Etat de la technique antérieure State of the prior art
Dans l’industrie agroalimentaire, les normes relatives au respect de l’hygiène nécessitent de n’utiliser que des matériaux aptes au contact alimentaire. Or ces matériaux sont plus coûteux et ont des caractéristiques mécaniques plus faibles. Cela a donc pour conséquence de générer des pompes plus longues et plus coûteuses. In the food industry, standards relating to compliance with hygiene require the use of only materials suitable for food contact. However, these materials are more expensive and have weaker mechanical characteristics. This therefore has the consequence of generating longer and more expensive pumps.
Présentation de l’invention Presentation of the invention
Un but de la présente invention est de proposer une pompe à cavités progressives moins coûteuse, qui respecte les normes d’hygiène de l’industrie agroalimentaire. En particulier, cette pompe doit garantir une parfaite étanchéité entre la zone au contact du produit alimentaire et les zones hors contact alimentaire, qui peuvent contenir par exemple des lubrifiants pour lubrifier les pièces d’entrainement. Des moyens permettant d’identifier un défaut d’étanchéité doivent aussi être mis en oeuvre dans la conception de la pompe. En effet, le liquide pompé ne doit pas comporter de substances toxiques car il sera ingéré par des personnes. De plus, cette pompe doit pouvoir s’insérer dans un procédé industriel de transfert ou de dosage de fluide, ce qui nécessite qu’elle puisse résister à une pression dans toutes les parties de la pompe. An object of the present invention is to provide a less expensive progressive cavity pump, which meets the hygiene standards of the food industry. In particular, this pump must guarantee perfect sealing between the zone in contact with the food product and the zones out of contact with food, which may contain, for example, lubricants to lubricate the drive parts. Means for identifying a sealing defect must also be implemented in the design of the pump. Indeed, the pumped liquid must not contain toxic substances because it will be ingested by people. In addition, this pump must be able to fit into an industrial fluid transfer or dosing process, which requires that it can withstand pressure in all parts of the pump.
Résumé de l’invention Summary of the invention
A cet effet l’invention propose une pompe à cavités progressives pour le pompage d’un liquide agro-alimentaire, la pompe à cavités progressives comportant un stator, un rotor hélicoïdal agencé dans le stator et un dispositif d’entrainement, le dispositif d’entrainement comportant : To this end, the invention proposes a progressive cavity pump for pumping an agrifood liquid, the progressive cavity pump comprising a stator, a helical rotor arranged in the stator and a drive device, the training including:
- un carter délimitant une chambre d’aspiration, - a casing defining a suction chamber,
- un arbre d’entrainement propre à être entrainer en rotation autour d’un axe de rotation,- a drive shaft capable of being driven in rotation around an axis of rotation,
- une armature propre à être entrainée en rotation par l’arbre d’entrainement, l’armature étant montée rotative dans le carter, - an armature capable of being driven in rotation by the drive shaft, the armature being rotatably mounted in the housing,
- au moins un mécanisme de transmission fixé au rotor et à l’arbre d’entrainement, - at least one transmission mechanism fixed to the rotor and to the drive shaft,
- au moins une gaine primaire enveloppant le mécanisme de transmission, - at least one primary sheath enveloping the transmission mechanism,
- une gaine secondaire fixée d’une part, au rotor et au mécanisme de transmission, et d’autre part, à l’armature; la au moins une gaine primaire, la gaine secondaire et l’armature délimitant une chambre de récupération située dans la chambre d’aspiration ; la chambre de récupération étant propre à récupérer du liquide pompé lorsque l’étanchéité entre la gaine secondaire et le rotor est imparfaite. - A secondary sheath fixed on the one hand, to the rotor and to the transmission mechanism, and on the other hand, to the armature; the at least one primary sheath, the secondary sheath and the frame delimiting a recovery chamber located in the suction chamber; the recovery chamber being suitable for recovering pumped liquid when the seal between the sheath secondary and the rotor is imperfect.
Avantageusement, la gaine primaire empêche le liquide pompé d’être en contact avec les graisses graissant le mécanisme de transmission afin qu’il ne soit pas souillé. Advantageously, the primary sheath prevents the pumped liquid from coming into contact with the greases lubricating the transmission mechanism so that it is not soiled.
Avantageusement, la chambre intermédiaire est propre à récupérer du liquide pompé lorsque l’étanchéité entre le rotor et la gaine secondaire est défectueuse. Advantageously, the intermediate chamber is suitable for recovering pumped liquid when the seal between the rotor and the secondary sheath is defective.
Avantageusement, la chambre de récupération permet d’isoler le liquide qui pourrait être souillé du liquide pompé qui , lui, est transporté par la pompe à cavités progressives. Advantageously, the recovery chamber makes it possible to isolate the liquid which could be contaminated from the pumped liquid which is transported by the progressive cavity pump.
Suivant des modes particuliers de réalisation, la pompe à cavités progressives comporte l'une ou plusieurs des caractéristiques suivantes . According to particular embodiments, the progressive cavity pump comprises one or more of the following characteristics.
Selon un mode de réalisation, le carter comporte en outre une cavité de stockage, l’armature étant pourvue d’une ouverture permettant l’écoulement de liquide de la chambre de récupération vers la cavité de stockage. According to one embodiment, the housing further comprises a storage cavity, the frame being provided with an opening allowing the flow of liquid from the recovery chamber to the storage cavity.
Selon un mode de réalisation, la pompe comporte en outre un capteur apte à détecter la présence de liquide et à transmettre un signal d’alerte en cas de présence de liquide, ledit capteur étant agencé dans la cavité de stockage. According to one embodiment, the pump further comprises a sensor able to detect the presence of liquid and to transmit an alert signal in the event of the presence of liquid, said sensor being arranged in the storage cavity.
Selon un mode de réalisation, le dispositif d’entrainement comporte un capuchon comprenant un fond ayant une ouverture centrale et un rebord périphérique, le capuchon comprenant au moins une rainure s’étendant radialement sur une face externe du fond et se prolongeant sur une face externe du rebord, le rebord fixant par coincement une partie de la gaine primaire contre le mécanisme de transmission. According to one embodiment, the drive device comprises a cap comprising a bottom having a central opening and a peripheral rim, the cap comprising at least one groove extending radially on an outer face of the bottom and extending on an outer face of the flange, the flange fixing by wedging a part of the primary sheath against the transmission mechanism.
Avantageusement, la rainure récupère du liquide pompé et le ramène à l’intérieur de la chambre de récupération lorsque la gaine secondaire est défectueuse. Advantageously, the groove recovers the pumped liquid and brings it back inside the recovery chamber when the secondary sheath is defective.
Avantageusement, le capuchon permet de fixer la gaine primaire au mécanisme de transmission. Advantageously, the cap makes it possible to fix the primary sheath to the transmission mechanism.
Selon un mode de réalisation, l’armature comporte un cylindre creux et un tube creux logé dans le cylindre, et dans laquelle la gaine secondaire est fixée par coincement entre le cylindre et le tube. According to one embodiment, the armature comprises a hollow cylinder and a hollow tube housed in the cylinder, and in which the secondary sheath is fixed by wedging between the cylinder and the tube.
Avantageusement, cet assemblage permet une fixation solide et hygiénique de la gaine secondaire à l’armature. Advantageously, this assembly allows solid and hygienic attachment of the secondary sheath to the frame.
Avantageusement, cet assemblage est facile à démonter. A cet effet, le cylindre peut être coulissé sur le tube de manière à libérer une extrémité de la gaine secondaire. Advantageously, this assembly is easy to disassemble. For this purpose, the cylinder can be slid on the tube so as to release one end of the secondary sheath.
Selon un mode de réalisation, le cylindre comprend une face intérieure, un bord annulaire et un évidement, l’évidement étant ouvert sur une partie de la face intérieure du cylindre et sur une partie du bord annulaire du cylindre, l’évidement présentant une épaisseur inférieure à l’épaisseur de la gaine secondaire, une portion d’extrémité de la gaine secondaire étant logée et coincée dans ledit évidement. According to one embodiment, the cylinder comprises an inner face, an annular edge and a recess, the recess being open on a part of the inner face of the cylinder and on a part of the annular edge of the cylinder, the recess having a thickness less than the thickness of the secondary sheath, an end portion of the secondary sheath being housed and wedged in said recess.
Selon un mode de réalisation, une face intérieure de la gaine secondaire comporte un bourrelet annulaire, et dans laquelle la face extérieure du tube est pourvue d’une gorge annulaire, le bourrelet de la gaine secondaire étant logé dans la gorge du tube. Avantageusement, l’ensemble bourrelet et gorge assurent l’étanchéité entre l’armature et la gaine secondaire. According to one embodiment, an inner face of the secondary sheath comprises a annular bead, and in which the outer face of the tube is provided with an annular groove, the bead of the secondary sheath being housed in the groove of the tube. Advantageously, the bead and groove assembly provide sealing between the reinforcement and the secondary sheath.
Selon un mode de réalisation, une face extérieure de la gaine secondaire comporte un renflement annulaire, l’évidement du cylindre étant pourvu d’une gorge annulaire, le renflement de la gaine secondaire étant logé dans la gorge du cylindre. According to one embodiment, an outer face of the secondary sheath comprises an annular bulge, the recess of the cylinder being provided with an annular groove, the bulge of the secondary sheath being housed in the groove of the cylinder.
Selon un mode de réalisation, le rotor comporte une face d’extrémité s’étendant perpendiculairement à l’axe de rotation, ladite face d’extrémité comportant une gorge annulaire, et dans laquelle la gaine secondaire comporte un manchon ayant un axe de symétrie et une paroi annulaire s’étendant perpendiculairement à l’axe de symétrie, une face extérieure de la paroi annulaire comporte une saillie annulaire, la saillie est logée dans la gorge du rotor pour améliorer l’étanchéité entre le rotor et le mécanisme de transmission. Selon un mode de réalisation, le mécanisme de transmission comporte une face latérale s’étendant dans un plan perpendiculaire à l’axe de rotation, et dans laquelle ladite face latérale comporte un premier décrochement, la paroi annulaire de la gaine secondaire étant montée dans ledit premier décrochement. According to one embodiment, the rotor comprises an end face extending perpendicular to the axis of rotation, said end face comprising an annular groove, and in which the secondary sheath comprises a sleeve having an axis of symmetry and an annular wall extending perpendicular to the axis of symmetry, an outer face of the annular wall has an annular projection, the projection is housed in the groove of the rotor to improve the seal between the rotor and the transmission mechanism. According to one embodiment, the transmission mechanism comprises a side face extending in a plane perpendicular to the axis of rotation, and in which said side face comprises a first recess, the annular wall of the secondary sheath being mounted in said first dropout.
Selon un mode de réalisation, le mécanisme de transmission comporte une face latérale s’étendant dans un plan perpendiculaire à l’axe de rotation, et dans laquelle ladite face latérale du mécanisme de transmission comporte un deuxième décrochement, le capuchon étant agencé dans ledit deuxième décrochement. According to one embodiment, the transmission mechanism comprises a side face extending in a plane perpendicular to the axis of rotation, and in which said side face of the transmission mechanism comprises a second recess, the cap being arranged in said second setback.
L’invention concerne également un dispositif d’entrainement destiné à une pompe à cavités progressives pour le pompage d’un liquide agro-alimentaire comportant un stator, un rotor hélicoïdal agencé dans le stator, le dispositif d’entrainement comportant : The invention also relates to a drive device intended for a pump with progressive cavities for pumping an agrifood liquid comprising a stator, a helical rotor arranged in the stator, the drive device comprising:
- un carter délimitant une chambre d’aspiration, - a casing defining a suction chamber,
- un arbre d’entrainement propre à être entrainé autour d’un axe de rotation, - a drive shaft capable of being driven around an axis of rotation,
- une armature creuse entrainée en rotation par l’arbre d’entrainement, l’armature étant montée rotative dans la carter, - a hollow armature rotated by the drive shaft, the armature being rotatably mounted in the housing,
- au moins un mécanisme de transmission fixé à l’arbre d’entrainement, le mécanisme de transmission étant destiné à être fixé au rotor, - at least one transmission mechanism fixed to the drive shaft, the transmission mechanism being intended to be fixed to the rotor,
- au moins une gaine primaire enveloppant le mécanisme de transmission, - at least one primary sheath enveloping the transmission mechanism,
- une gaine secondaire fixée d’une part, à l’armature et destinée à être fixée d’autre part, au rotor et au mécanisme de transmission ; la gaine primaire, la gaine secondaire et l’armature délimitant une chambre de récupération située dans la chambre d’aspiration ; la chambre de récupération étant propre à récupérer du liquide pompé lorsque l’étanchéité entre et le mécanisme de transmission et le rotor, est imparfaite. Brève description des figures - A secondary sheath fixed on the one hand, to the armature and intended to be fixed on the other hand, to the rotor and to the transmission mechanism; the primary sheath, the secondary sheath and the frame delimiting a recovery chamber located in the suction chamber; the recovery chamber being suitable for recovering pumped liquid when the seal between the transmission mechanism and the rotor is imperfect. Brief description of figures
[Fig. 1] est une vue de côté d’une pompe à cavités progressives selon l’invention ; [Fig. 1] is a side view of a progressive cavity pump according to the invention;
[Fig. 2] est une vue en coupe de la pompe à cavités progressives illustrée sur la figure 1 selon un plan de coupe vertical ; [Fig. 2] is a sectional view of the progressive cavity pump illustrated in FIG. 1 along a vertical section plane;
[Fig. 3] est une vue de face d’un capuchon de la pompe à cavités progressives illustrée sur la figure 1 ; [Fig. 3] is a front view of a cap of the progressive cavity pump shown in Figure 1;
[Fig. 4] est une vue de côté du capuchon illustré sur la figure 3 ; [Fig. 4] is a side view of the cap shown in Figure 3;
[Fig. 5] est une vue en perspective d’une gaine primaire montée dans la pompe à cavités progressives illustrée sur la figure 1 ; [Fig. 5] is a perspective view of a primary sheath mounted in the progressive cavity pump shown in Figure 1;
[Fig. 6] est une vue en coupe de la gaine primaire illustrée sur la figure 5 selon un plan de coupe illustré sur la figure 5 ; [Fig. 6] is a sectional view of the primary sheath shown in Figure 5 along a sectional plane shown in Figure 5;
[Fig. 7] est une vue en perspective de l’extrémité du rotor ; [Fig. 7] is a perspective view of the end of the rotor;
[Fig. 8] est un agrandissement de la figure 2. [Fig. 8] is an enlargement of figure 2.
Description détaillée de l’invention Detailed description of the invention
Dans la présente demande, les termes « droite », « gauche », « inférieur » doivent être interprété à la lumière des figures 1 et 2. Ils ne sont nullement limitatifs. Par ailleurs, le terme « radial » doit être interprétée comme toute perpendiculaire à l’axe de rotation A-A. In the present application, the terms “right”, “left”, “lower” must be interpreted in the light of FIGS. 1 and 2. They are in no way limiting. Furthermore, the term "radial" must be interpreted as any perpendicular to the axis of rotation A-A.
En référence aux figures 1 et 2, la pompe à cavité progressives 2 comporte un stator 4, un rotor 6 hélicoïdal logé dans le stator, un dispositif d’entrainement 8, et une conduite de refoulement 10. Pour des raisons de simplification, une partie du rotor et du stator ont été tronquées sur les figures 1 et 2. Referring to Figures 1 and 2, the progressive cavity pump 2 comprises a stator 4, a helical rotor 6 housed in the stator, a drive device 8, and a discharge pipe 10. For reasons of simplification, a part rotor and stator have been truncated in Figures 1 and 2.
Le rotor 6 comporte une face d’extrémité 12 pourvue d’un alésage 14 taraudé et d’une gorge 16 annulaire encerclant l’alésage. La face d’extrémité 12 s’étend dans un plan sensiblement perpendiculaire à l’axe de rotation du rotor. The rotor 6 has an end face 12 provided with a threaded bore 14 and an annular groove 16 encircling the bore. The end face 12 extends in a plane substantially perpendicular to the axis of rotation of the rotor.
Le dispositif d’entrainement 8 comporte un carter 18 et une conduite d’aspiration 20. Le carter 18 délimite une chambre intérieure. Le carter 18 comprend une ouverture sur laquelle la conduite d’aspiration est fixée, deux canaux 22, une face latérale droite 24 ouverte et une face latérale 26 gauche ouverte. Les canaux 22 sont contenus dans un même plan radial. Ils sont alignés. Ils s’étendent verticalement. The drive device 8 comprises a casing 18 and a suction pipe 20. The casing 18 defines an interior chamber. The housing 18 comprises an opening on which the suction line is fixed, two channels 22, a right side face 24 open and a left side face 26 open. The channels 22 are contained in the same radial plane. They are aligned. They extend vertically.
La face latérale gauche 26 est fixée au stator par un collier de serrage. La face latérale droite 24 est traversée par un arbre d’entrainement 27 propre à être entrainé en rotation autour de d’un axe de rotation A-A par un moteur non représenté. La face latérale droite 24 est fermée. Le dispositif d’entrainement 8 comporte en outre un premier mécanisme de transmission 28 relié mécaniquement au rotor, un arbre d’entrainement intermédiaire 30 relié mécaniquement au premier mécanisme de transmission, un deuxième mécanisme de transmission 32 relié mécaniquement à l’arbre d’entrainement intermédiaire et à l’arbre d’entrainement 27. L’arbre d’entrainement intermédiaire, le premier et le deuxième mécanismes de transmission sont situés dans la chambre intérieure. The left side face 26 is fixed to the stator by a clamping collar. The right side face 24 is traversed by a drive shaft 27 capable of being driven in rotation around an axis of rotation AA by a motor, not shown. The right side face 24 is closed. The drive device 8 further comprises a first transmission mechanism 28 mechanically connected to the rotor, an intermediate drive shaft 30 mechanically connected to the first transmission mechanism, a second transmission mechanism 32 mechanically connected to the drive shaft intermediate and to the drive shaft 27. The shaft intermediate drive, the first and second transmission mechanisms are located in the inner chamber.
Le premier mécanisme de transmission et le deuxième mécanisme de transmission sont, par exemple, constitués par des cardans. Ils permettent de faire pivoter le rotor selon un mouvement excentrique à partir d’un mouvement concentrique transmis par l’arbre d’entrainement 27. The first transmission mechanism and the second transmission mechanism are, for example, constituted by gimbals. They make it possible to pivot the rotor according to an eccentric movement from a concentric movement transmitted by the drive shaft 27.
Dans le mode de réalisation représenté, le premier mécanisme de transmission 28 comprend une face latérale 34 qui s’étend sensiblement perpendiculairement à l’axe de rotation A-A. La face latérale 34 comprend un arbre central 36 fileté, une face annulaire 38 formant un épaulement, un premier décrochement 40 et un deuxième décrochement 42 plus distant de l’arbre que le premier décrochement. L’arbre central 36 est agencé dans l’alésage 14 du rotor. En variante, d’autres modes de fixation peuvent être mis en oeuvre. In the embodiment shown, the first transmission mechanism 28 comprises a side face 34 which extends substantially perpendicular to the axis of rotation A-A. The side face 34 comprises a threaded central shaft 36, an annular face 38 forming a shoulder, a first recess 40 and a second recess 42 more distant from the shaft than the first recess. The central shaft 36 is arranged in the bore 14 of the rotor. As a variant, other methods of fixing can be implemented.
Dans le mode de réalisation représenté, le deuxième mécanisme de transmission 32 comprend un alésage. L’arbre d’entrainement 27 comprend une tige emboitée dans l’alésage du deuxième mécanisme de transmission. Une ou plusieurs vis de fixation 44 assure la fixation de la tige de l’arbre 27 au deuxième mécanisme de transmission. La (ou les) vis 44 s’étend(ent) radialement. En variante, d’autres modes de fixation peuvent être mis en oeuvre. Le dispositif d’entrainement 8 comporte également une armature 46 creuse, un palier annulaire 48 monté entre le carter 18 et l’armature, un capteur 49 et un dispositif d’étanchéité 50 agencé entre le carter et l’armature. In the embodiment shown, the second transmission mechanism 32 comprises a bore. The drive shaft 27 comprises a rod fitted into the bore of the second transmission mechanism. One or more fixing screws 44 secure the rod of the shaft 27 to the second transmission mechanism. The screw(s) 44 extend(s) radially. As a variant, other methods of fixing can be implemented. The drive device 8 also comprises a hollow armature 46, an annular bearing 48 mounted between the casing 18 and the armature, a sensor 49 and a sealing device 50 arranged between the casing and the armature.
L’armature 46 est propre à être entrainée en rotation par l’arbre d’entrainement 27. Elle est constituée par un cylindre 52 creux et un tube 54 creux logé dans le cylindre. Le cylindre, le tube et le deuxième mécanisme de transmission 32 sont fixés l’un à l’autre. Cette fixation est par exemple réalisée, par la (ou les) vis de fixation 44 et par une ou plusieurs vis de fixation supplémentaire(s) 45. L’armature 46 comporte une ouverture 55 permettant le passage de liquide, comme explicité ultérieurement. The armature 46 is capable of being driven in rotation by the drive shaft 27. It consists of a hollow cylinder 52 and a hollow tube 54 housed in the cylinder. The cylinder, the tube and the second transmission mechanism 32 are fixed to each other. This fixing is for example carried out by the fixing screw(s) 44 and by one or more additional fixing screw(s) 45. The armature 46 comprises an opening 55 allowing the passage of liquid, as explained later.
Le cylindre 52 comprend une face intérieure 56, un bord annulaire 58 et un évidement 60. L’évidement 60 est ouvert sur une partie de la face intérieure du cylindre et sur une partie du bord annulaire du cylindre. L’évidement 60 est pourvu d’une gorge 62 annulaire. La face extérieure du bord du tube est également pourvue d’une gorge 64 annulaire. The cylinder 52 comprises an interior face 56, an annular edge 58 and a recess 60. The recess 60 is open on a part of the interior face of the cylinder and on a part of the annular edge of the cylinder. The recess 60 is provided with an annular groove 62. The outer face of the edge of the tube is also provided with an annular groove 64.
Le palier annulaire 48 partage la chambre intérieure en deux chambres isolées l’une de l’autre. Une chambre est située du côté du rotor. Elle est appelée « chambre d’aspiration 66 » dans la présente demande de brevet. La conduite d’aspiration 20, les canaux 22 et la face latérale 24,26 débouchent dans la chambre d’aspiration. Une cavité est située du côté de l’arbre d’entrainement. Elle est appelée « cavité de stockage 68 » dans la présente demande de brevet. The annular bearing 48 divides the inner chamber into two chambers isolated from each other. A chamber is located on the side of the rotor. It is called “suction chamber 66” in this patent application. The suction line 20, the channels 22 and the side face 24,26 open into the suction chamber. A cavity is located on the side of the drive shaft. It is called “storage cavity 68” in the present patent application.
Le capteur 49 est logé dans la cavité de stockage 68. Il est propre à détecter la présence de liquide et à transmettre un signal d’alerte en cas de présence de liquide, comme explicité ultérieurement. The sensor 49 is housed in the storage cavity 68. It is capable of detecting the presence of liquid and to transmit an alert signal in the event of the presence of liquid, as explained later.
Le dispositif d’étanchéité 50 permet d’assurer l’herméticité entre la chambre d’aspiration contenant le liquide pompé et la cavité de stockage. The sealing device 50 ensures airtightness between the suction chamber containing the pumped liquid and the storage cavity.
Le dispositif d’étanchéité est fixé à côté du palier annulaire 48 du côté de la chambre d’aspiration. Le dispositif d’étanchéité comporte une bague d’étanchéité dynamique 70, une bague entretoise 72 agencée à côté et à droite de la bague d’étanchéité dynamique, et une bague d’étanchéité dynamique 74 située à côté et à droite de la bague entretoise. La bague entretoise 72 comporte plusieurs passages 76 s’étendant selon un axe radial de la bague. La bague entretoise 72 est disposée dans le carter de manière que chaque passage 76 soit positionné au droit d’un canal 22 du carter. The sealing device is fixed next to the annular bearing 48 on the side of the suction chamber. The sealing device comprises a dynamic sealing ring 70, a spacer ring 72 arranged beside and to the right of the dynamic sealing ring, and a dynamic sealing ring 74 located beside and to the right of the spacer ring. . The spacer ring 72 comprises several passages 76 extending along a radial axis of the ring. The spacer ring 72 is arranged in the casing so that each passage 76 is positioned in line with a channel 22 of the casing.
Ainsi, en cas de perte d’étanchéité entre l’armature 46 et la bague d’étanchéité dynamique 70, le liquide contenu dans la chambre d’aspiration s’écoule à l’extérieur de la pompe par le passage 76 et le canal 22. Ainsi, les utilisateurs de la pompe à cavités progressives sont informés du fait que la bague d’étanchéité dynamique est à changer. Une flaque se forme à côté de la pompe à cavités progressives. Le passage 76 et le canal 22 peuvent également être utilisé pour le graissage de l’étanchéité dynamique ou pour la mise en place d’une barrière hydraulique. Thus, in the event of loss of tightness between the armature 46 and the dynamic sealing ring 70, the liquid contained in the suction chamber flows outside the pump through the passage 76 and the channel 22 Thus, users of the progressive cavity pump are informed that the dynamic sealing ring needs to be changed. A puddle forms next to the progressive cavity pump. Passage 76 and channel 22 can also be used for lubricating the dynamic seal or for installing a hydraulic barrier.
Avantageusement, un capteur 80 peut être agencé dans le canal 22 du carter ou en dessous de celui-ci. Ce capteur sera propre à détecter la présence du liquide et à transmettre un signal d’alerte aux utilisateurs en cas de présence de liquide. Ce capteur est représenté de façon schématique sur la figure 2. Le capteur 80 est aussi utile lorsqu’il est dangereux ne peut pas se permettre d’avoir une flaque du produit par terre (ex : produit radioactif, chimique, etc...). Il faut alors arrêter la pompe dès la première détection d’un fluide de fuite par mesure de sécurité. Advantageously, a sensor 80 can be arranged in the channel 22 of the casing or below the latter. This sensor will be able to detect the presence of liquid and transmit an alert signal to users in the event of the presence of liquid. This sensor is shown schematically in Figure 2. The sensor 80 is also useful when it is dangerous and cannot afford to have a puddle of product on the ground (eg radioactive, chemical product, etc.) . The pump must then be stopped on the first detection of a leaking fluid as a safety measure.
En variante, le carter 18 et la bague entretoise 72 comportent un unique canal et respectivement un unique passage situé en partie inférieure de la pompe à cavités progressives. As a variant, the casing 18 and the spacer ring 72 comprise a single channel and respectively a single passage located in the lower part of the progressive cavity pump.
Le dispositif d’entrainement 8 comporte en outre deux gaines primaires 82, un capuchon 84 et une gaine secondaire 86 fixée d’une part, à l’armature 46, et d’autre part, au rotor et au premier mécanisme de transmission 28. The drive device 8 further comprises two primary sheaths 82, a cap 84 and a secondary sheath 86 fixed on the one hand, to the armature 46, and on the other hand, to the rotor and to the first transmission mechanism 28.
Les gaines primaires 82 sont réalisées en élastomère. Les gaines primaires créent des enveloppes de protection autour des mécanismes de transmission 28, 32. Elles empêchent les graisses entourant les mécanismes de transmission de se mélanger au liquide pompé en cas de fuite et de rupture de la gaine secondaire 86. The primary sheaths 82 are made of elastomer. The primary sleeves create protective envelopes around the transmission mechanisms 28, 32. They prevent the greases surrounding the transmission mechanisms from mixing with the pumped liquid in the event of a leak and rupture of the secondary sleeve 86.
Les gaines primaires 82 présentent une forme générale de manchon. En particulier, les gaines primaires comprennent une première portion cylindrique et une deuxième portion cylindrique de plus petit diamètre que la première portion cylindrique. La première portion cylindrique est reliée à la deuxième portion cylindrique. La première portion cylindrique présente une longueur sensiblement égale à la longueur d’un mécanisme de transmission. La face intérieure de la gaine primaire présente à chacune de ses extrémités un bourrelet annulaire. L’arbre d’entrainement intermédiaire 30 comporte une gorge annulaire dans laquelle loge un bourrelet annulaire. Un bord du mécanisme de transmission comporte une gorge annulaire logeant l’autre bourrelet annulaire. The primary sheaths 82 have the general shape of a sleeve. In particular, the primary sheaths comprise a first cylindrical portion and a second portion cylindrical of smaller diameter than the first cylindrical portion. The first cylindrical portion is connected to the second cylindrical portion. The first cylindrical portion has a length substantially equal to the length of a transmission mechanism. The inner face of the primary sheath has an annular bead at each of its ends. The intermediate drive shaft 30 has an annular groove in which an annular bead is housed. One edge of the transmission mechanism has an annular groove housing the other annular bead.
Un collier de serrage fixe une extrémité de la gaine primaire contre l’arbre d’entrainement intermédiaire 30. Le collier de serrage est agencé autour du bord de la gaine primaire sensiblement dans le même plan radial que le bourrelet et la gorge. A clamp secures one end of the primary sheath against the intermediate drive shaft 30. The clamp is arranged around the edge of the primary sheath substantially in the same radial plane as the bead and the groove.
Le capuchon 84 est monté sur le premier mécanisme de transmission 28 et coiffe le bord de la gaine primaire. Le capuchon 84 plaque et fixe par coincement cette extrémité de la gaine primaire contre le premier mécanisme de transmission. The cap 84 is mounted on the first transmission mechanism 28 and caps the edge of the primary sheath. The cap 84 plates and fixes by wedging this end of the primary sheath against the first transmission mechanism.
En référence aux figures 3 et 4, le capuchon 84 comporte un fond 88 ayant une ouverture centrale et un rebord 90 périphérique. Le capuchon est emmanché sur la face latérale du premier mécanisme de transmission. L’arbre 36 du premier mécanisme de transmission traverse l’ouverture centrale. Le fond 88 est logé dans le deuxième décrochement 42. Referring to Figures 3 and 4, the cap 84 includes a bottom 88 having a central opening and a rim 90 device. The cap is fitted onto the side face of the first transmission mechanism. The shaft 36 of the first transmission mechanism passes through the central opening. The bottom 88 is housed in the second recess 42.
Le capuchon 84 comprend deux rainures 92 s’étendant radialement sur une face externe du fond et se prolongeant longitudinalement sur une face externe du rebord 90. De préférence, les deux rainures 92 sont alignées le long d’un diamètre du fond. En cas de dysfonctionnement de l’étanchéité entre le rotor 8 et la gaine secondaire 86, les rainures permettent l’écoulement de liquide pompé de la chambre d’aspiration 66 vers une chambre de récupération 94, comme explicité dans le fonctionnement décrit ci-après. The cap 84 includes two grooves 92 extending radially on an outer face of the bottom and extending longitudinally on an outer face of the flange 90. Preferably, the two grooves 92 are aligned along a diameter of the bottom. In the event of a malfunction in the seal between the rotor 8 and the secondary sheath 86, the grooves allow the flow of liquid pumped from the suction chamber 66 to a recovery chamber 94, as explained in the operation described below. .
En variante, le capuchon comprend une seule rainure. Alternatively, the cap includes a single groove.
En référence aux figures 5 et 6, la gaine secondaire 86 est réalisée en matériau souple comme par exemple en élastomère. Elle comprend un manchon 96 et une paroi annulaire 98 formée à un bout du manchon. Le manchon 96 possède un axe de symétrie X-X. La paroi annulaire 98 s’étend perpendiculairement à l’axe de symétrie X-X. Une face extérieure 100 de la paroi annulaire comporte une saillie annulaire 102. Referring to Figures 5 and 6, the secondary sheath 86 is made of flexible material such as elastomer for example. It includes a sleeve 96 and an annular wall 98 formed at one end of the sleeve. Sleeve 96 has an X-X axis of symmetry. The annular wall 98 extends perpendicular to the axis of symmetry X-X. An outer face 100 of the annular wall has an annular projection 102.
La gaine secondaire 86 est emmanchée sur le capuchon. L’arbre 36 du mécanisme de transmission traverse le trou au centre de la paroi annulaire. La paroi annulaire 98 est logée dans le premier décrochement 40. La face d’extrémité 12 du rotor est en appui sur la face latérale 34 du mécanisme de transmission. La saillie 102 est logée dans la gorge 16 du rotor pour améliorer l’étanchéité entre le rotor et le premier mécanisme de transmission. The secondary sheath 86 is fitted onto the cap. The shaft 36 of the transmission mechanism passes through the hole in the center of the annular wall. The annular wall 98 is housed in the first recess 40. The end face 12 of the rotor bears against the side face 34 of the transmission mechanism. The projection 102 is housed in the groove 16 of the rotor to improve the seal between the rotor and the first transmission mechanism.
Une portion d’extrémité du manchon est agencée et coincée dans l’évidement 60. Cet évidement 60 présente une épaisseur légèrement inférieure à l’épaisseur de la gaine secondaire 86 de sorte que la gaine secondaire soit fixée à l’armature 46 par coincement entre la paroi intérieure de l’évidement du cylindre et la face externe du tube. An end portion of the sleeve is arranged and wedged in the recess 60. This recess 60 has a thickness slightly less than the thickness of the sheath secondary 86 so that the secondary sheath is fixed to the frame 46 by wedging between the inner wall of the cylinder recess and the outer face of the tube.
Dans le mode de réalisation représenté, la face intérieure 103 du manchon de la gaine secondaire comprend à son extrémité un bourrelet 104 annulaire. Le bourrelet 104 est logé dans la gorge 64 du tube. L’ensemble bourrelet 104 et gorge 64 permet d’améliorer l’étanchéité entre le gaine secondaire 86 et le tube 54. In the embodiment shown, the inner face 103 of the sleeve of the secondary sheath comprises at its end an annular bead 104. The bead 104 is housed in the groove 64 of the tube. The bead 104 and groove 64 assembly improves the seal between the secondary sheath 86 and the tube 54.
Dans le mode de réalisation représenté, la face extérieure du manchon de la gaine secondaire comporte un renflement 106 annulaire. Le renflement 106 est logé dans la gorge 62 du cylindre. L’ensemble renflement 106 et gorge 62 permet d’améliorer l’étanchéité entre le gaine secondaire 86 et le cylindre 52. In the embodiment shown, the outer face of the sleeve of the secondary sheath comprises an annular bulge 106. The bulge 106 is housed in the groove 62 of the cylinder. The bulge 106 and groove 62 assembly improves the seal between the secondary sheath 86 and the cylinder 52.
Les gaines primaires 82, la gaine secondaire 86 et l’armature 46 délimite une chambre de récupération 94. The primary sheaths 82, the secondary sheath 86 and the armature 46 define a recovery chamber 94.
En variante, l’arbre d’entrainement intermédiaire 30 et les mécanismes de transmission 28, 32 sont remplacer par un cardan. Alternatively, the intermediate drive shaft 30 and the transmission mechanisms 28, 32 are replaced by a universal joint.
En variante, les deux gaines primaires 82 sont remplacées par une gaine unique recouvrant les deux cardans. As a variant, the two primary sheaths 82 are replaced by a single sheath covering the two gimbals.
En fonctionnement, le fluide pompé est aspiré par la conduite d’aspiration, transporté par rotation du rotor 8 dans le stator 4, puis est rejeté par la conduite de refoulement 10. Lorsque l’étanchéité entre la gaine secondaire 86 et le rotor 6 est imparfaite, la chambre de récupération 94 récupère le liquide qui s’est introduit entre la gaine secondaire et le premier mécanisme de transmission. Le capuchon 84 guide ce liquide vers la chambre de récupération 94. Ce liquide s’écoule ensuite par l’ouverture 51 de l’armature vers la cavité de stockage 68. La capteur 49 détecte la présence de liquide et transmet un signal d’alerte aux utilisateurs. Ainsi, les utilisateurs sont informés du fait que l’étanchéité entre la gaine secondaire et le rotor est imparfaite. Ils peuvent lancer une opération de maintenance afin de changer la gaine secondaire. Ainsi, cette pompe à cavités progressives permet d’éviter de contaminer le liquide pompé par des graisses ou des huiles pour un cout modeste puisqu’il n’est ainsi pas nécessaire de réaliser les pièces d’entrainement en matériaux aptes au contact alimentaire. In operation, the pumped fluid is sucked up by the suction pipe, transported by rotation of the rotor 8 in the stator 4, then is rejected by the discharge pipe 10. When the seal between the secondary sheath 86 and the rotor 6 is imperfect, the recovery chamber 94 recovers the liquid which is introduced between the secondary sheath and the first transmission mechanism. The cap 84 guides this liquid towards the recovery chamber 94. This liquid then flows through the opening 51 of the armature towards the storage cavity 68. The sensor 49 detects the presence of liquid and transmits an alert signal to users. Thus, users are informed of the fact that the seal between the secondary sheath and the rotor is imperfect. They can launch a maintenance operation to change the secondary sheath. Thus, this pump with progressive cavities makes it possible to avoid contaminating the pumped liquid with fats or oils for a modest cost since it is thus not necessary to make the drive parts in materials suitable for contact with food.

Claims

9 REVENDICATIONS 9 CLAIMS
1 . Pompe à cavités progressives (2) pour le pompage d’un liquide agro-alimentaire, la pompe à cavités progressives comportant un stator (4), un rotor (6) hélicoïdal agencé dans le stator et un dispositif d’entrainement (8), le dispositif d’entrainement (8) comportant : 1 . Progressive cavity pump (2) for pumping an agrifood liquid, the progressive cavity pump comprising a stator (4), a helical rotor (6) arranged in the stator and a drive device (8), the drive device (8) comprising:
- un carter (18) délimitant une chambre d’aspiration (66), - a casing (18) delimiting a suction chamber (66),
- un arbre d’entrainement (27, 30) propre à être entrainer en rotation autour d’un axe de rotation (A-A), - a drive shaft (27, 30) capable of being driven in rotation around an axis of rotation (A-A),
- une armature (46) propre à être entrainée en rotation par l’arbre d’entrainement, l’armature étant montée rotative dans le carter, - an armature (46) adapted to be driven in rotation by the drive shaft, the armature being rotatably mounted in the housing,
- au moins un mécanisme de transmission (28) fixé au rotor et à l’arbre d’entrainement,- at least one transmission mechanism (28) fixed to the rotor and to the drive shaft,
- au moins une gaine primaire (82) enveloppant le mécanisme de transmission,- at least one primary sheath (82) enveloping the transmission mechanism,
- une gaine secondaire (86) fixée d’une part, au rotor (6) et au mécanisme de transmission (28), et d’autre part, à l’armature(46); la au moins une gaine primaire (82), la gaine secondaire (86) et l’armature (46) délimitant une chambre de récupération située dans la chambre d’aspiration ; la chambre de récupération (94) étant propre à récupérer du liquide pompé lorsque l’étanchéité entre la gaine secondaire et le rotor est imparfaite. - a secondary sheath (86) fixed on the one hand, to the rotor (6) and to the transmission mechanism (28), and on the other hand, to the armature (46); the at least one primary sheath (82), the secondary sheath (86) and the frame (46) delimiting a recovery chamber located in the suction chamber; the recovery chamber (94) being suitable for recovering pumped liquid when the seal between the secondary sheath and the rotor is imperfect.
2. Pompe à cavités progressives (2) selon la revendication 1 , dans laquelle le carter (18) comporte en outre une cavité de stockage (68), l’armature (46) étant pourvue d’une ouverture (55) permettant l’écoulement de liquide de la chambre de récupération (94) vers la cavité de stockage (68). 2. progressive cavity pump (2) according to claim 1, wherein the housing (18) further comprises a storage cavity (68), the armature (46) being provided with an opening (55) allowing the flow of liquid from the collection chamber (94) to the storage cavity (68).
3. Pompe à cavités progressives (2) selon la revendication 2, qui comporte en outre un capteur (49) apte à détecter la présence de liquide et à transmettre un signal d’alerte en cas de présence de liquide, ledit capteur (49) étant agencé dans la cavité de stockage (68). 3. Progressive cavity pump (2) according to claim 2, which further comprises a sensor (49) able to detect the presence of liquid and to transmit an alert signal in the event of the presence of liquid, said sensor (49) being arranged in the storage cavity (68).
4. Pompe à cavités progressives^) selon l’une quelconque des revendications 1 à 3, dans laquelle le dispositif d’entrainement (8) comporte un capuchon (84) comprenant un fond (88) ayant une ouverture centrale et un rebord (90) périphérique, le capuchon (84) comprenant au moins une rainure (92) s’étendant radialement sur une face externe du fond (88) et se prolongeant sur une face externe du rebord (90), le rebord (90) fixant par coincement une partie de la gaine primaire (82) contre le mécanisme de transmission (28). 4. progressive cavity pump ^) according to any one of claims 1 to 3, wherein the drive device (8) comprises a cap (84) comprising a bottom (88) having a central opening and a rim (90 ) device, the cap (84) comprising at least one groove (92) extending radially on an outer face of the bottom (88) and extending on an outer face of the flange (90), the flange (90) fixing by wedging a portion of the primary sheath (82) against the transmission mechanism (28).
5. Pompe à cavités progressives (2) selon l’une quelconque des revendications 1 à 4, dans laquelle l’armature (46) comporte un cylindre (52) creux et un tube (54) creux logé dans le cylindre, et dans laquelle la gaine secondaire (86) est fixée par coincement entre le cylindre (52) et le tube (54). 5. progressive cavity pump (2) according to any one of claims 1 to 4, wherein the armature (46) comprises a hollow cylinder (52) and a hollow tube (54) housed in the cylinder, and wherein the secondary sheath (86) is fixed by wedging between the cylinder (52) and the tube (54).
6. Pompe à cavités progressives (2) selon la revendication 5, dans laquelle le cylindre (52) comprend une face intérieure (56), un bord annulaire (58) et un évidement (60), l’évidement (60) étant ouvert sur une partie de la face intérieure du cylindre et sur une partie du bord annulaire du cylindre, l’évidement (60) présentant une épaisseur inférieure à l’épaisseur de la gaine secondaire (86), une portion d’extrémité de la gaine secondaire (86) étant logée et coincée dans ledit évidement. 6. Progressive cavity pump (2) according to claim 5, in which the cylinder (52) comprises an interior face (56), an annular edge (58) and a recess (60), the recess (60) being open on a part of the inner face of the cylinder and on a part of the annular edge of the cylinder, the recess (60) having a thickness less than the thickness of the secondary sheath (86), an end portion of the secondary sheath (86) being housed and wedged in said recess.
7. Pompe à cavités progressives (2) selon la revendication 5, dans laquelle une face intérieure (103) de la gaine secondaire comporte un bourrelet (104) annulaire, et dans laquelle la face extérieure du tube (54) est pourvue d’une gorge (64) annulaire, le bourrelet (104) de la gaine secondaire étant logé dans la gorge (64) du tube. 7. progressive cavity pump (2) according to claim 5, wherein an inner face (103) of the secondary sheath comprises an annular bead (104), and wherein the outer face of the tube (54) is provided with a groove (64) annular, the bead (104) of the secondary sheath being housed in the groove (64) of the tube.
8. Pompe à cavités progressives (2) selon la revendication 6, dans laquelle une face extérieure (100) de la gaine secondaire comporte un renflement (106) annulaire, l’évidement (60) du cylindre étant pourvu d’une gorge (62) annulaire, le renflement (106) de la gaine secondaire étant logé dans la gorge (62) du cylindre. 8. Progressive cavity pump (2) according to claim 6, in which an outer face (100) of the secondary sheath comprises an annular bulge (106), the recess (60) of the cylinder being provided with a groove (62 ) annular, the bulge (106) of the secondary sheath being housed in the groove (62) of the cylinder.
9. Pompe à cavités progressives (2) selon l’une quelconque des revendications 1 à 8, dans laquelle le rotor (6) comporte une face d’extrémité (12) s’étendant perpendiculairement à l’axe de rotation (A-A), ladite face d’extrémité comportant une gorge annulaire(16), et dans laquelle la gaine secondaire (86) comporte un manchon (96) ayant un axe de symétrie (X-X) et une paroi annulaire (98) s’étendant perpendiculairement à l’axe de symétrie, une face extérieure (100) de la paroi annulaire comporte une saillie (102) annulaire, la saillie (102) est logée dans la gorge (16) du rotor pour améliorer l’étanchéité entre le rotor (6) et le mécanisme de transmission (28). 9. progressive cavity pump (2) according to any one of claims 1 to 8, wherein the rotor (6) has an end face (12) extending perpendicular to the axis of rotation (AA), said end face comprising an annular groove (16), and wherein the secondary sheath (86) comprises a sleeve (96) having an axis of symmetry (XX) and an annular wall (98) extending perpendicular to the axis of symmetry, an outer face (100) of the annular wall has an annular projection (102), the projection (102) is housed in the groove (16) of the rotor to improve the seal between the rotor (6) and the transmission mechanism (28).
10. Pompe à cavités progressives (2) selon la revendication 9, dans laquelle le mécanisme de transmission (28) comporte une face latérale (34) s’étendant dans un plan perpendiculaire à l’axe de rotation (A-A), et dans laquelle ladite face latérale (34) comporte un premier décrochement (40), la paroi annulaire (98) de la gaine secondaire étant montée dans ledit premier décrochement (40). 10. Progressive cavity pump (2) according to claim 9, in which the transmission mechanism (28) comprises a lateral face (34) extending in a plane perpendicular to the axis of rotation (AA), and in which said side face (34) has a first recess (40), the annular wall (98) of the secondary sheath being mounted in said first recess (40).
11 . Pompe à cavités progressives (2) selon la revendication 4 ou selon l’une des revendication 5 et 9 combinée à la revendication 4, dans laquelle le mécanisme de transmission (28) comporte une face latérale (34) s’étendant dans un plan perpendiculaire à l’axe de rotation (A-A), et dans laquelle ladite face latérale (34) du mécanisme de transmission comporte un deuxième décrochement (42), le capuchon (84) étant agencé dans ledit deuxième décrochement (42). 11 . Progressive cavity pump (2) according to Claim 4 or according to one of Claims 5 and 9 combined with Claim 4, in which the transmission mechanism (28) comprises a lateral face (34) extending in a plane perpendicular to the axis of rotation (AA), and wherein said side face (34) of the transmission mechanism has a second recess (42), the cap (84) being arranged in said second recess (42).
12. Dispositif d’entrainement (8) destiné à une pompe à cavités progressives (2) pour le pompage d’un liquide agro-alimentaire comportant un stator (4), un rotor (6) hélicoïdal 11 agencé dans le stator, le dispositif d’entrainement (8) comportant : 12. Drive device (8) intended for a progressive cavity pump (2) for pumping an agri-food liquid comprising a stator (4), a helical rotor (6) 11 arranged in the stator, the drive device (8) comprising:
- un carter (18) délimitant une chambre d’aspiration (66), - a casing (18) delimiting a suction chamber (66),
- un arbre d’entrainement (27, 30) propre à être entrainé autour d’un axe de rotation (A- A), - une armature (46) creuse entrainée en rotation par l’arbre d’entrainement (27, 30), l’armature (46) étant montée rotative dans la carter (18), - a drive shaft (27, 30) adapted to be driven around an axis of rotation (A- A), - a hollow armature (46) driven in rotation by the drive shaft (27, 30) , the armature (46) being rotatably mounted in the housing (18),
- au moins un mécanisme de transmission (28) fixé à l’arbre d’entrainement, le mécanisme de transmission étant destiné à être fixé au rotor(6), - at least one transmission mechanism (28) fixed to the drive shaft, the transmission mechanism being intended to be fixed to the rotor (6),
- au moins une gaine primaire (82) enveloppant le mécanisme de transmission (28,32), - une gaine secondaire (86) fixée d’une part, à l’armature(46) et destinée à être fixée d’autre part, au rotor (6) et au mécanisme de transmission (28); la gaine primaire (82), la gaine secondaire (86) et l’armature (46) délimitant une chambre de récupération (94) située dans la chambre d’aspiration (66) ; la chambre de récupération (94) étant propre à récupérer du liquide pompé lorsque l’étanchéité entre et le mécanisme de transmission (28) et le rotor (6), est imparfaite. - at least one primary sheath (82) enveloping the transmission mechanism (28,32), - a secondary sheath (86) fixed on the one hand, to the armature (46) and intended to be fixed on the other hand, to the rotor (6) and to the transmission mechanism (28); the primary sheath (82), the secondary sheath (86) and the frame (46) delimiting a recovery chamber (94) located in the suction chamber (66); the recovery chamber (94) being suitable for recovering pumped liquid when the seal between the transmission mechanism (28) and the rotor (6) is imperfect.
PCT/EP2021/075824 2020-09-21 2021-09-20 Progressive cavity pump and pumping device WO2022058593A1 (en)

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FR2009550A FR3114358B1 (en) 2020-09-21 2020-09-21 Progressive cavity pump and pumping device
FRFR2009550 2020-09-21

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4237704A (en) * 1979-03-08 1980-12-09 Roper Industries, Inc. Oldham type coupling and pump embodying the same
US20120039734A1 (en) * 2009-03-31 2012-02-16 Heishin Ltd Rotor drive mechanism and pump apparatus including the same
FR3044348A1 (en) * 2016-06-17 2017-06-02 Somega Du Centre VOLUMETRIC PUMP, IN PARTICULAR A PISTON OR A SCREW WITH EXCELLENT MOTION COMPRISING A RIGOROUS SEALING DEVICE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4237704A (en) * 1979-03-08 1980-12-09 Roper Industries, Inc. Oldham type coupling and pump embodying the same
US20120039734A1 (en) * 2009-03-31 2012-02-16 Heishin Ltd Rotor drive mechanism and pump apparatus including the same
FR3044348A1 (en) * 2016-06-17 2017-06-02 Somega Du Centre VOLUMETRIC PUMP, IN PARTICULAR A PISTON OR A SCREW WITH EXCELLENT MOTION COMPRISING A RIGOROUS SEALING DEVICE

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FR3114358A1 (en) 2022-03-25

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