IT201800000549A1 - Volumetric metering pump and metering system comprising at least one such pump - Google Patents
Volumetric metering pump and metering system comprising at least one such pump Download PDFInfo
- Publication number
- IT201800000549A1 IT201800000549A1 IT201800000549A IT201800000549A IT201800000549A1 IT 201800000549 A1 IT201800000549 A1 IT 201800000549A1 IT 201800000549 A IT201800000549 A IT 201800000549A IT 201800000549 A IT201800000549 A IT 201800000549A IT 201800000549 A1 IT201800000549 A1 IT 201800000549A1
- Authority
- IT
- Italy
- Prior art keywords
- stator
- metering pump
- product
- volumetric metering
- pump
- Prior art date
Links
- 230000000750 progressive effect Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 239000011247 coating layer Substances 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 5
- 239000005060 rubber Substances 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- -1 polyethylene Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 229920001169 thermoplastic Polymers 0.000 claims description 4
- 239000004416 thermosoftening plastic Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 235000011837 pasties Nutrition 0.000 claims description 3
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 2
- 238000005253 cladding Methods 0.000 claims 2
- 238000001746 injection moulding Methods 0.000 claims 1
- 239000002904 solvent Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000013037 co-molding Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 240000005428 Pistacia lentiscus Species 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
-
- 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
-
- 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
- F04C2230/00—Manufacture
- F04C2230/90—Improving properties of machine parts
- F04C2230/91—Coating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Fertilizing (AREA)
Description
Descrizione dell’Invenzione Industriale avente per titolo: Description of the Industrial Invention entitled:
“POMPA DOSATRICE VOLUMETRICA E SISTEMA DI DOSAGGIO COMPRENDENTE ALMENO UNA TALE POMPA” "VOLUMETRIC DOSING PUMP AND DOSING SYSTEM INCLUDING AT LEAST ONE SUCH PUMP"
DESCRIZIONE DESCRIPTION
La presente invenzione si riferisce ad una pompa dosatrice volumetrica per prodotti in polvere, liquidi, pastosi o cremosi, e ad un sistema di dosaggio comprendente almeno una tale pompa. The present invention refers to a volumetric metering pump for powdered, liquid, pasty or creamy products, and to a metering system comprising at least one such pump.
In particolare l’invenzione si riferisce ad una pompa a cavità progressive per il dosaggio e l’erogazione di prodotti in polvere o ad elevata viscosità quali, per esempio, colle, mastici, grasso, vernici ecc. e ad un sistema di dosaggio comprendente almeno una tale pompa. In particular, the invention refers to a progressive cavity pump for dosing and dispensing powder or high viscosity products such as, for example, glues, mastics, grease, paints, etc. and to a metering system comprising at least one such pump.
Sono note pompe a cavità progressive utilizzate in sistemi di dosaggio che presentano numerosi vantaggi: garantiscono una perfetta tenuta quando il rotore interno è fermo rispetto allo statore esterno, un’elevata affidabilità con usura trascurabile tra il rotore interno e lo statore esterno, permettono un’erogazione continua ed estremamente precisa del prodotto evitando possibili gocciolamenti al livello del condotto di uscita. Progressive cavity pumps are known used in dosing systems which have numerous advantages: they guarantee a perfect seal when the internal rotor is stationary with respect to the external stator, high reliability with negligible wear between the internal rotor and the external stator, allow a continuous and extremely precise dispensing of the product avoiding possible dripping at the level of the outlet duct.
Gli statori di queste pompe a cavità progressive note sono realizzati in gomma, preferibilmente vulcanizzata, stampata a compressione. The stators of these known progressive cavity pumps are made of rubber, preferably vulcanized, compression molded.
Queste pompe a cavità progressive però non sono soddisfacenti e presentano il problema che per loro natura chimica, le gomme con cui sono realizzati gli statori hanno un range di compatibilità limitata con i prodotti erogati, che in caso di presenza di solventi più aggressivi. However, these progressive cavity pumps are not satisfactory and have the problem that due to their chemical nature, the rubbers with which the stators are made have a limited compatibility range with the products supplied, which in the presence of more aggressive solvents.
Per superare questo problema, occorre realizzare statori utilizzando materiali di costo sempre maggiore con l’aumento dell’aggressività dei solventi presenti nel prodotto erogato, fino a raggiungere livelli di costo eccessivi e non in linea con il mercato di riferimento. To overcome this problem, stators must be made using materials of increasing cost with the increase in the aggressiveness of the solvents present in the dispensed product, up to excessive cost levels and not in line with the reference market.
Scopo della presente invenzione è quello di risolvere i suddetti problemi della tecnica anteriore fornendo una pompa dosatrice volumetrica a cavità progressive ed un sistema di dosaggio comprendente almeno una tale pompa, che consentano il loro utilizzo per erogare prodotti contenenti solventi aggressivi, mantenendo al contempo un costo ridotto della pompa. The object of the present invention is to solve the aforementioned problems of the prior art by providing a volumetric metering pump with progressive cavities and a metering system comprising at least one such pump, which allow their use to dispense products containing aggressive solvents, while maintaining a cost. reduced pump.
I suddetti ed altri scopi e vantaggi dell’invenzione, quali risulteranno dal seguito della descrizione, vengono raggiunti con una pompa dosatrice volumetrica ed un sistema di dosaggio comprendente almeno una tale pompa come quelli descritti nelle rivendicazioni indipendenti. Forme di realizzazione preferite e varianti non banali della presente invenzione formano l’oggetto delle rivendicazioni dipendenti. The aforementioned and other purposes and advantages of the invention, which will emerge from the following description, are achieved with a volumetric metering pump and a metering system comprising at least one such pump as those described in the independent claims. Preferred embodiments and non-trivial variants of the present invention form the subject of the dependent claims.
Resta inteso che tutte le rivendicazioni allegate formano parte integrante della presente descrizione. It is understood that all the attached claims form an integral part of the present description.
Risulterà immediatamente ovvio che si potranno apportare a quanto descritto innumerevoli varianti e modifiche (per esempio relative a forma, dimensioni, disposizioni e parti con funzionalità equivalenti) senza discostarsi dal campo di protezione dell'invenzione come appare dalle rivendicazioni allegate. It will be immediately obvious that innumerable variations and modifications (for example relating to shape, dimensions, arrangements and parts with equivalent functionality) can be made to what has been described without departing from the scope of the invention as appears from the attached claims.
La presente invenzione verrà meglio descritta da alcune forme preferite di realizzazione, fornite a titolo esemplificativo e non limitativo, con riferimento ai disegni allegati, nei quali: The present invention will be better described by some preferred embodiments, provided by way of non-limiting example, with reference to the attached drawings, in which:
- la FIG. 1 mostra una vista laterale in sezione di una pompa dosatrice volumetrica secondo la presente invenzione; e - FIG. 1 shows a sectional side view of a volumetric metering pump according to the present invention; And
- la FIG. 2 mostra una vista laterale in sezione di un particolare di una pompa dosatrice volumetrica secondo la presente invenzione. - FIG. 2 shows a sectional side view of a detail of a volumetric metering pump according to the present invention.
Facendo riferimento alle figure, la pompa 10 dosatrice volumetrica secondo la presente invenzione, in particolare per l’erogazione ed il dosaggio di prodotti in polvere, liquidi, pastosi o cremosi comprende un primo condotto 5 di ingresso del prodotto da dosare, un secondo condotto 9 di uscita di tale prodotto dosato, una cavità interna 12 collegata al primo condotto 5 di ingresso del prodotto da dosare e almeno un elemento pompante a cavità progressive 7, dosatore di tale prodotto, collegato operativamente a mezzi motori, costituiti ad esempio da un motore elettrico di comando (non mostrato nelle figure), e collegato fluidicamente alla cavità interna 12 ed al secondo condotto 9 di uscita di tale prodotto dosato. With reference to the figures, the volumetric metering pump 10 according to the present invention, in particular for dispensing and dosing products in powder, liquid, pasty or creamy form, comprises a first inlet duct 5 for the product to be dosed, a second duct 9 output of this metered product, an internal cavity 12 connected to the first inlet duct 5 of the product to be metered and at least one pumping element with progressive cavities 7, metering of this product, operatively connected to motor means, consisting for example of an electric motor control unit (not shown in the figures), and fluidically connected to the internal cavity 12 and to the second outlet duct 9 of this metered product.
Preferibilmente l’elemento pompante a cavità progressive 7 comprende un involucro esterno statore 14 ed un rotore interno 15 comandato in rotazione dai mezzi motori, tale rotore interno 15 essendo conformato come vite senza fine a cavità progressive la cui rotazione relativa rispetto allo statore 14 causa un movimento di traslazione del prodotto al suo interno. Quando la pompa 10 a cavità progressive è azionata dai mezzi motori, durante il movimento di rotazione del suo rotore interno 15, trasferisce determinate quantità di prodotto dal primo condotto 5 di aspirazione di tale prodotto da dosare al secondo condotto 9 di uscita. Preferably the pumping element with progressive cavities 7 comprises an external stator casing 14 and an internal rotor 15 driven into rotation by the motor means, said internal rotor 15 being shaped as a worm screw with progressive cavities whose relative rotation with respect to the stator 14 causes a translation movement of the product inside it. When the progressive cavity pump 10 is operated by the motor means, during the rotational movement of its internal rotor 15, it transfers certain quantities of product from the first suction duct 5 of this product to be dosed to the second outlet duct 9.
Lo statore comprende inoltre una superficie interna 16 a contatto con il rotore 15 che, analogamente ad esso, ha forma di vite senza fine o a spirale, detta superficie interna 16 essendo rivestita da uno strato di rivestimento 18 realizzato in un materiale differente rispetto al materiale con cui è realizzato lo statore 14. The stator also comprises an internal surface 16 in contact with the rotor 15 which, similarly to it, has the shape of a worm or spiral, said internal surface 16 being covered by a coating layer 18 made of a material different from the material with which the stator 14 is made of.
Preferibilmente lo statore 14 è realizzato in gomma, ad esempio in gomma termoplastica mediante stampaggio, e lo strato di rivestimento 18 è in materiale polimerico plastico e/o termoplastico, ad esempio in polietilene. Preferably, the stator 14 is made of rubber, for example of thermoplastic rubber by molding, and the covering layer 18 is of plastic and / or thermoplastic polymeric material, for example of polyethylene.
In modo preferito lo statore 14 e lo strato di rivestimento 18 sono realizzati tramite costampaggio ad iniezione dello statore 14 e dello strato di rivestimento 18; preferibilmente lo statore 14 e lo strato di rivestimento 18 sono realizzati mediante co-stampaggio della gomma e di uno strato di materiale polimerico plastico e/o termoplastico, ad esempio polietilene. Preferably, the stator 14 and the coating layer 18 are made by injection co-molding the stator 14 and the coating layer 18; preferably the stator 14 and the covering layer 18 are made by co-molding the rubber and a layer of plastic and / or thermoplastic polymeric material, for example polyethylene.
Vantaggiosamente lo strato di rivestimento 18 in materiale polimerico plastico e/o termoplastico, ad esempio polietilene, consente di utilizzare la pompa con materiali contenenti i solventi più utilizzati, senza danneggiare la superficie dello statore 14 e con un costo limitato. Advantageously, the coating layer 18 made of plastic and / or thermoplastic polymeric material, for example polyethylene, allows the pump to be used with materials containing the most commonly used solvents, without damaging the surface of the stator 14 and with a limited cost.
Un sistema dosatore/erogatore secondo la presente invenzione comprende almeno un dispositivo di gestione ed azionamento, tale dispositivo di gestione ed azionamento comprendente mezzi motori, ed almeno una pompa dosatrice 10 come quella precedentemente descritta connessa operativamente a tali mezzi motori, ad esempio mediante l’interposizione di almeno un relativo albero rotante. A metering / dispensing system according to the present invention comprises at least one management and actuation device, such a management and actuation device comprising motor means, and at least one metering pump 10 such as the one described above, operationally connected to said motor means, for example by means of the interposition of at least one relative rotating shaft.
Vantaggiosamente, il sistema secondo la presente invenzione può inoltre comprendere mezzi di alimentazione e/o di stoccaggio del prodotto da dosare ed erogare dalla pompa dosatrice 10, connessi fluidicamente al primo condotto 5 di aspirazione. Advantageously, the system according to the present invention can also comprise means for feeding and / or storing the product to be metered and dispensed by the metering pump 10, fluidically connected to the first suction duct 5.
Si è descritta una forma preferita di attuazione dell’invenzione, ma naturalmente essa è suscettibile di ulteriori modifiche e varianti nell’ambito della medesima idea inventiva. In particolare, agli esperti nel ramo risulteranno immediatamente evidenti numerose varianti e modifiche, funzionalmente equivalenti alle precedenti, che ricadono nel campo di protezione dell'invenzione come evidenziato nelle rivendicazioni allegate nelle quali, eventuali segni di riferimento posti tra parentesi non possono essere interpretati nel senso di limitare le rivendicazioni stesse. Inoltre, la parola "comprendente" non esclude la presenza di elementi e/o fasi diversi da quelli elencati nelle rivendicazioni. L’articolo “un”, “uno” o “una” precedente un elemento non esclude la presenza di una pluralità di tali elementi. Il semplice fatto che alcune caratteristiche siano citate in rivendicazioni dipendenti diverse tra loro non indica che una combinazione di queste caratteristiche non possa essere vantaggiosamente utilizzata. A preferred embodiment of the invention has been described, but of course it is susceptible to further modifications and variations within the scope of the same inventive idea. In particular, to those skilled in the art, numerous variants and modifications, functionally equivalent to the previous ones, will be immediately evident, which fall within the scope of the invention as highlighted in the attached claims in which any reference marks placed between brackets cannot be interpreted in the sense of to limit the claims themselves. Furthermore, the word "comprising" does not exclude the presence of elements and / or phases other than those listed in the claims. The article "a", "one" or "a" preceding an element does not exclude the presence of a plurality of such elements. The mere fact that some characteristics are mentioned in different dependent claims does not indicate that a combination of these characteristics cannot be advantageously used.
Claims (7)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT201800000549A IT201800000549A1 (en) | 2018-01-05 | 2018-01-05 | Volumetric metering pump and metering system comprising at least one such pump |
| EP18842665.4A EP3735535B1 (en) | 2018-01-05 | 2018-12-21 | Volumetric dosing pump and dosing system comprising at least one of such pumps |
| US16/959,802 US20200370555A1 (en) | 2018-01-05 | 2018-12-21 | Volumetric dosing pump and dosing system comprising at least one of such pumps |
| PCT/IT2018/000170 WO2019135261A1 (en) | 2018-01-05 | 2018-12-21 | Volumetric dosing pump and dosing system comprising at least one of such pumps |
| CN201880085388.6A CN111542701A (en) | 2018-01-05 | 2018-12-21 | Volumetric pump and metering system comprising at least one such pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT201800000549A IT201800000549A1 (en) | 2018-01-05 | 2018-01-05 | Volumetric metering pump and metering system comprising at least one such pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT201800000549A1 true IT201800000549A1 (en) | 2018-04-05 |
Family
ID=61952794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT201800000549A IT201800000549A1 (en) | 2018-01-05 | 2018-01-05 | Volumetric metering pump and metering system comprising at least one such pump |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20200370555A1 (en) |
| EP (1) | EP3735535B1 (en) |
| CN (1) | CN111542701A (en) |
| IT (1) | IT201800000549A1 (en) |
| WO (1) | WO2019135261A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2740725C1 (en) * | 2020-04-08 | 2021-01-20 | Общество с ограниченной ответственностью "ПРОИЗВОДСТВЕННАЯ КОМПАНИЯ "МОНОРОТОР" | Single-screw microdispenser |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004036043A1 (en) * | 2002-10-21 | 2004-04-29 | Noetic Engineering Inc. | Stator of a moineau-pump |
| US20100038142A1 (en) * | 2007-12-18 | 2010-02-18 | Halliburton Energy Services, Inc. | Apparatus and method for high temperature drilling operations |
| WO2012024215A2 (en) * | 2010-08-16 | 2012-02-23 | National Oilwell Varco, L.P. | Reinforced stators and fabrication methods |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4849201A (en) * | 1988-09-02 | 1989-07-18 | The United States Of America As Represented By The Secretary Of The Army | Process for preparing chlorinated lime |
| CN1093607C (en) * | 1998-09-25 | 2002-10-30 | 振源(厦门)工业有限公司 | Method for manufacturing sealed miniature immersible pump |
| US6220838B1 (en) * | 1999-11-03 | 2001-04-24 | Dyno Nobel Inc. | Progressive cavity pump with meltable stator |
| CN1421613A (en) * | 2002-12-22 | 2003-06-04 | 崔乃林 | Screw pump made of polymer material and ceramic and its manufacture |
| US8197241B2 (en) * | 2007-12-18 | 2012-06-12 | Schlumberger Technology Corporation | Nanocomposite Moineau device |
| DE102008039973A1 (en) * | 2008-08-27 | 2010-03-04 | Wmf Württembergische Metallwarenfabrik Ag | Cavity Pump |
| US20110308557A1 (en) * | 2010-06-16 | 2011-12-22 | Stewart Kaiser | Combination Anti-Microbial Drain Pan Float and High Temperature Brine Injected Automated Drain Cleaner |
| EP2872563A4 (en) * | 2012-07-16 | 2016-05-25 | Polyone Corp | Polyethylene compounds having non-migratory slip properties |
| US9896885B2 (en) * | 2015-12-10 | 2018-02-20 | Baker Hughes Incorporated | Hydraulic tools including removable coatings, drilling systems, and methods of making and using hydraulic tools |
-
2018
- 2018-01-05 IT IT201800000549A patent/IT201800000549A1/en unknown
- 2018-12-21 WO PCT/IT2018/000170 patent/WO2019135261A1/en unknown
- 2018-12-21 US US16/959,802 patent/US20200370555A1/en active Pending
- 2018-12-21 CN CN201880085388.6A patent/CN111542701A/en active Pending
- 2018-12-21 EP EP18842665.4A patent/EP3735535B1/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004036043A1 (en) * | 2002-10-21 | 2004-04-29 | Noetic Engineering Inc. | Stator of a moineau-pump |
| US20100038142A1 (en) * | 2007-12-18 | 2010-02-18 | Halliburton Energy Services, Inc. | Apparatus and method for high temperature drilling operations |
| WO2012024215A2 (en) * | 2010-08-16 | 2012-02-23 | National Oilwell Varco, L.P. | Reinforced stators and fabrication methods |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3735535B1 (en) | 2024-07-31 |
| EP3735535A1 (en) | 2020-11-11 |
| US20200370555A1 (en) | 2020-11-26 |
| WO2019135261A1 (en) | 2019-07-11 |
| CN111542701A (en) | 2020-08-14 |
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