IT202000021280A1 - MULTI-SCREW PUMP FOR COOLING CIRCUITS - Google Patents
MULTI-SCREW PUMP FOR COOLING CIRCUITS Download PDFInfo
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- IT202000021280A1 IT202000021280A1 IT102020000021280A IT202000021280A IT202000021280A1 IT 202000021280 A1 IT202000021280 A1 IT 202000021280A1 IT 102020000021280 A IT102020000021280 A IT 102020000021280A IT 202000021280 A IT202000021280 A IT 202000021280A IT 202000021280 A1 IT202000021280 A1 IT 202000021280A1
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- Italy
- Prior art keywords
- pump
- screws
- screw
- driven
- fluid
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 16
- 238000002485 combustion reaction Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000007667 floating Methods 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000011905 homologation Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- 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
- 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
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
- F04C2/165—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type having more than two rotary pistons with parallel axes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/60—Shafts
- F04C2240/603—Shafts with internal channels for fluid distribution, e.g. hollow shaft
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Description
Descrizione della domanda di brevetto per invenzione industriale dal titolo: Description of the patent application for an industrial invention entitled:
?Pompa a pi? viti per circuiti di raffreddamento?. ?Pump to pi? screws for cooling circuits?.
Descrizione Description
La presente invenzione si riferisce a una pompa a pi? viti per circuiti di raffreddamento. The present invention refers to a pi pump screws for cooling circuits.
Pi? in particolare, la presente invenzione si riferisce a una pompa a pi? viti volumetrica rotativa per circuiti di raffreddamento di propulsori e ausiliari installati su veicoli con motori a combustione interna, elettrici o ibridi. Pi? in particular, the present invention relates to a pi pump? rotary volumetric screws for cooling circuits of propulsion and auxiliary units installed on vehicles with internal combustion, electric or hybrid engines.
Come ? noto, la circolazione del fluido refrigerante nei motori a combustione interna alternativi, noti come MCI, viene attualmente realizzata tramite pompe centrifughe di tipo dinamico, collegate meccanicamente all?albero di rotazione del motore. Da tale collegamento deriva il fatto che dette pompe vengono trascinate a diverse velocit? di rotazione, in funzione di quella dell?albero motore. ? altres? noto che nelle pompe di circolazione di tecnologia centrifuga, dinamica, i rendimenti sono fortemente influenzati dalla velocit? di rotazione, nonch? dalla portata e dalla prevalenza prodotte; pertanto, al variare della velocit? di rotazione esse operano con rendimenti mediamente pi? bassi di quelli che caratterizzano le condizioni di progetto, usualmente riferite al punto operativo del motore in cui si esprime la massima potenza. How ? known, the circulation of the cooling fluid in reciprocating internal combustion engines, known as MCI, is currently achieved by centrifugal pumps of the dynamic type, mechanically connected to the rotation shaft of the engine. From this connection derives the fact that these pumps are driven at different speeds? of rotation, according to that of the crankshaft. ? otherwise? It is known that in centrifugal technology circulation pumps, dynamics, the yields are strongly influenced by the speed? of rotation, as well as? the flow rate and head produced; therefore, as the speed varies? rotation, they operate with yields on average more? lower than those characterizing the design conditions, usually referred to the operating point of the engine at which maximum power is expressed.
Considerato che i cicli di omologazione del veicolo riguardano condizioni operative del motore caratterizzate da medie/basse prestazioni in termini di velocit? di rotazione e potenza prodotta, e che su tali cicli vengono valutate le emissioni di CO2 da confrontare con quelle massime ammissibili, si comprende come le pompe usualmente utilizzate presentino consumi meccanici elevati che si riverberano sui consumi di combustibile e, in definitiva, sulle emissioni di CO2. Sarebbe invece auspicabile che il rendimento della pompa risultasse il pi? possibile indipendente dalla sua velocit? di rotazione e dalle condizioni di esercizio. Given that the cycles of homologation of the vehicle concern operating conditions of the engine characterized by medium/low performance in terms of speed? of rotation and power produced, and that on these cycles the CO2 emissions are evaluated to be compared with the maximum allowable ones, it is understood that the pumps usually used have high mechanical consumption which reverberates on fuel consumption and, ultimately, on CO2. On the other hand, it would be desirable that the efficiency of the pump turned out to be the most? possible independent of its speed? of rotation and the operating conditions.
Le note pompe attualmente presenti sul mercato, concepite principalmente per impieghi industriali leggeri nel settore dell?oleodinamica, non soddisfano tali requisiti; pompe nelle quali il fluido pompato viene trasportato tra le filettature di uno o pi? rotori, in cui il liquido ? disposto in una direzione generalmente parallela all?asse di rotazione del o di ciascun rotore, sono conosciute, e sono generalmente indicate come pompe a vite. Un esempio al riguardo si trova in US 2,693,763. ? possibile aumentare la pressione massima del fluido in uscita per una pompa di questo tipo aumentando la lunghezza della vite, ma in tal modo non si ottiene un prodotto compatto e adeguato per applicazioni automotive, dove lo spazio di installazione nel cofano motore ? limitato. Da EP 1 475 537 ? nota una pompa provvista di almeno tre rotori, disposti in un alloggiamento comune, in cui la rotazione della vite motrice provoca quella delle viti condotte e il fluido pressurizzato ? utilizzato per movimentare un attuatore; la vite motrice ? supportata da un cuscinetto radiale a sfere, mentre per quelle condotte il supporto avviene per sostentamento idrodinamico. The well-known pumps currently on the market, designed mainly for light industrial uses in the hydraulic sector, do not meet these requirements; pumps in which the pumped fluid is transported between the threads of one or more? rotors, in which the liquid ? arranged in a direction generally parallel to the axis of rotation of the or each rotor, are known, and are generally referred to as screw pumps. An example of this is found in US 2,693,763. ? It is possible to increase the maximum pressure of the outlet fluid for a pump of this type by increasing the length of the screw, but in this way a compact and suitable product for automotive applications is not obtained, where the installation space in the engine hood? limited. From EP 1 475 537 ? known a pump provided with at least three rotors, arranged in a common housing, in which the rotation of the driving screw causes that of the driven screws and the pressurized fluid ? used to move an actuator; the driving screw? supported by a radial ball bearing, while for the driven ones the support takes place by hydrodynamic sustenance.
Pompe di questo genere non sono utilizzabili per circuiti di raffreddamento di propulsori e ausiliari installati su veicoli con motori a combustione interna. Pumps of this type cannot be used for cooling circuits of propulsors and auxiliaries installed on vehicles with internal combustion engines.
Scopo della presente invenzione ? quello di ovviare agli inconvenienti sopra lamentati. Purpose of the present invention? to overcome the drawbacks mentioned above.
Pi? in particolare, lo scopo della presente invenzione ? quello di provvedere una pompa di circolazione in grado di garantire un rendimento sostanzialmente indipendente dalla sua velocit? di rotazione e dalle condizioni di esercizio. Pi? in particular, the purpose of the present invention ? that of providing a circulation pump capable of guaranteeing an efficiency substantially independent of its speed? of rotation and the operating conditions.
Ulteriore e conseguente scopo dell?invenzione ? quello di provvedere una pompa di circolazione atta a consentire un apprezzabile risparmio dell?energia meccanica necessaria per il suo trascinamento, quindi una riduzione di emissioni di CO2. Further and consequent purpose of the invention? that of providing a circulation pump capable of allowing an appreciable saving of the mechanical energy necessary for its dragging, therefore a reduction of CO2 emissions.
Non ultimo scopo dell?invenzione ? quello di provvedere una pompa in cui sono minimizzati gli attriti e i fenomeni di usura che ne potrebbero degradare nel tempo le prestazioni. Not the last purpose of the invention? that of providing a pump in which friction and wear phenomena that could degrade its performance over time are minimized.
Ulteriore scopo dell?invenzione ? quello di mettere a disposizione degli utilizzatori una pompa a pi? viti per circuiti di raffreddamento atta a garantire un elevato livello di resistenza e affidabilit? nel tempo, tale inoltre da poter essere facilmente ed economicamente realizzata. Another purpose of the invention? to make available to users a pump to pi? screws for cooling circuits to ensure a high level of resistance and reliability? over time, also such that it can be easily and economically implemented.
Questi e altri scopi ancora vengono raggiunti dalla pompa a pi? viti per circuiti di raffreddamento della presente invenzione in accordo con la rivendicazione principale. These and other goals are achieved by the pi pump? screws for cooling circuits of the present invention in accordance with the main claim.
Le caratteristiche costruttive e funzionali della pompa a pi? viti per circuiti di raffreddamento della presente invenzione potranno essere meglio comprese dalla dettagliata descrizione che segue, in cui si fa riferimento alle allegate tavole di disegni che ne rappresentano una forma di realizzazione preferita e non limitativa e in cui: The constructive and functional characteristics of the pi pump? screws for cooling circuits of the present invention can be better understood from the detailed description which follows, in which reference is made to the attached tables of drawings which represent a preferred and non-limiting embodiment thereof and in which:
la figura 1 rappresenta schematicamente una vista assonometrica della pompa a pi? viti per circuiti di raffreddamento della presente invenzione; figure 1 schematically represents an isometric view of the pump at the pi? screws for cooling circuits of the present invention;
la figura 2 rappresenta schematicamente la stessa pompa in sezione longitudinale; figure 2 schematically represents the same pump in longitudinal section;
la figura 3 rappresenta schematicamente la stessa pompa in sezione longitudinale, ruotata di 90? rispetto alla vista precedente; figure 3 schematically represents the same pump in longitudinal section, rotated by 90? compared to the previous view;
la figura 4 rappresenta schematicamente una vista assonometrica parzialmente sezionata di uno dei rotori della pompa della presente invenzione. figure 4 schematically represents a partially sectioned isometric view of one of the rotors of the pump of the present invention.
Con riferimento alle citate figure, la pompa a pi? viti per circuiti di raffreddamento della presente invenzione, indicata con 10 a figura 1 in cui ? rappresentata nel suo complesso, comprende un corpo pompa 12 in cui ? alloggiata una pluralit? di rotori, con viti preferibilmente cave per consentire l?alleggerimento della pompa medesima. I rotori sono almeno tre e ciascuno di essi ? provvisto di filettatura tipicamente e non criticamente elicoidale; detta pompa ? vantaggiosamente predisposta per un utilizzo in circuiti di raffreddamento di propulsori di veicoli e/o relativi sistemi ausiliari; almeno uno dei rotori indicato con 14 ? attivato da un motore elettrico o di altro genere 18, in modo che il moto di rotazione venga trasferito agli altri rotori condotti 14?. Il motore 18 ? alloggiato in un corpo contenitore a coperchio 18?. Si realizzano in pratica vani in rotazione che favoriscono il trascinamento del fluido verso la sezione o condotto di mandata, in prossimit? del quale la pressurizzazione del fluido alimenta uno o pi? circuiti di mandata (16). With reference to the cited figures, the pi pump? screws for cooling circuits of the present invention, indicated with 10 in figure 1 where ? represented as a whole, comprises a pump body 12 in which ? accommodated a plurality? of rotors, with preferably hollow screws to allow for the lightening of the pump itself. The rotors are at least three and each of them ? provided with typically and not critically helical thread; said pump? advantageously arranged for use in cooling circuits of vehicle propulsors and/or related auxiliary systems; at least one of the rotors indicated with 14 ? activated by an electric or other motor 18, so that the rotational motion is transferred to the other driven rotors 14?. The 18 engine? housed in a lidded container body 18?. In practice, rotating compartments are created which favor the dragging of the fluid towards the delivery section or duct, near the of which the pressurization of the fluid feeds one or more? delivery circuits (16).
La pompa 10 ? di preferenza provvista di una tenuta meccanica frontale 20 ad anelli striscianti, uno solidale alla pompa stessa e l?altro all?albero di rotazione 22 del motore 18, tenuti in collegamento da forza elastica o da una tenuta a labbro per delimitare la zona lambita dal fluido elaborato; pu? comunque prevedersi in aggiunta l?utilizzo di tenute statiche 24, con lo stesso scopo di contenimento del fluido elaborato. The pump 10 ? preferably provided with a front mechanical seal 20 with sliding rings, one integral with the pump itself and the other with the rotation shaft 22 of the motor 18, kept in connection by elastic force or by a lip seal to delimit the area touched by the fluid processed; can? however, the use of static seals 24 is also envisaged, with the same purpose of containment of the processed fluid.
Le viti condotte sono vantaggiosamente supportate da cuscinetti, radenti, volventi o una loro combinazione, in modo da scongiurare impuntamenti e minimizzare fenomeni di usura e dissipazioni per attrito, nonch? vibrazioni e rumorosit?; la particolare disposizione dei vincoli assiali, riferibili allo spallamento 28 (figura 4) dell?albero motore 22 e alle boccole 32 (figura 2), consente al gruppo costituito dalla vite motrice o rotore 14 e dalle viti condotte 14? (figure 2 e 4) di essere flottante assialmente, il che agevola da un lato le operazioni di montaggio e, dall?altro lato, evita impuntamenti dovuti a dilatazioni termiche. The driven screws are advantageously supported by sliding, rolling bearings or a combination thereof, in order to avoid jamming and minimize wear and friction dissipation phenomena, as well as? vibrations and noise; the particular arrangement of the axial constraints, referable to the shoulder 28 (figure 4) of the drive shaft 22 and to the bushings 32 (figure 2), allows the unit consisting of the driving screw or rotor 14 and the driven screws 14? (figures 2 and 4) to be floating axially, which on the one hand facilitates the assembly operations and, on the other hand, avoids jamming due to thermal expansion.
La vite motrice 14 ? vincolata unilateralmente verso l?albero motore 22 e la trasmissione della coppia si realizza con mezzi a chiavetta 26, mentre la coassialit? dello stesso albero motore 22 rispetto alla vite motrice 14 ? realizzata mediante un accoppiamento cilindrico, come da figura 4. The driving screw 14 ? constrained unilaterally towards the drive shaft 22 and the transmission of the torque is achieved by means of a key 26, while the coaxiality? of the same driving shaft 22 with respect to the driving screw 14 ? made by means of a cylindrical coupling, as shown in figure 4.
Il fine corsa in tale posizione ? determinato dal contatto tra la vite motrice 14 e lo spallamento 28 sull?albero motore 22. In tale direzione risultano vincolate anche le viti condotte 14? dal momento che una volta inserite nell?alloggiamento in presenza della vite motrice il loro scorrimento ha come fine corsa il contatto che si instaura tra le filettature, in particolare tra le scanalature delle stesse viti condotte 14? e le creste corrispondenti della vite motrice 14. Nella medesima direzione le viti condotte 14? non necessitano di vincolo assiale e i cuscinetti, siano essi radenti o volventi, sono riconducibili ad un vincolo carrello. Nel caso specifico rappresentato, il vincolo carrello ? costituito da almeno una boccola non flangiata 30 (fig. 2). Il fermo allo scorrimento assiale nel verso opposto ? realizzato sulle viti condotte 14? da un generico cuscinetto o equivalente mezzo di riscontro; nel caso specifico rappresentato alla stessa figura 2, il vincolo carrello ? costituito da una boccola flangiata 32. Is the limit switch in this position? determined by the contact between the drive screw 14 and the shoulder 28 on the drive shaft 22. Are the driven screws 14 also constrained in this direction? since once inserted in the housing in the presence of the driving screw, their sliding has the contact established between the threads, in particular between the grooves of the driven screws themselves 14? and the corresponding crests of the driving screw 14. In the same direction the driven screws 14? they do not require an axial constraint and the bearings, whether sliding or rolling, can be traced back to a carriage constraint. In the specific case represented, the trolley constraint ? consisting of at least one non-flanged bush 30 (fig. 2). The stop for axial sliding in the opposite direction? made on the driven screws 14? by a generic bearing or equivalent means of reference; in the specific case represented in the same figure 2, the carriage constraint ? consisting of a flanged bush 32.
Secondo un?ulteriore vantaggiosa caratteristica della pompa 10 dell?invenzione, il medesimo corpo contenitore a coperchio 18? ? utilizzato sia per creare la sede di almeno un cuscinetto 34 dell?albero motore 22, sia per la sede della tenuta dinamica e delle boccole 30; ci? permette di ridurre al minimo gli errori di allineamento fra tali componenti. Nella forma di realizzazione preferita e non limitativa di cui alle figure, la tenuta dinamica ? costituita da una tenuta meccanica frontale ad anelli striscianti 20, non escludendosi tuttavia la possibilit? che detta tenuta dinamica sia di altro tipo, ad esempio formata da una tenuta a labbro o simili. Come accennato, la vite motrice 14 e le viti condotte 14? sono di preferenza cave (fig. 4), al fine ridurre i pesi e le inerzie del sistema. Nel caso in cui la cavit? della vite motrice sia passante e metta in comunicazione i due estremi in senso assiale della vite stessa, ? possibile realizzare un passaggio di fluido tra la camera di aspirazione e la camera a ridosso della tenuta indicata con 39 a figura 3; in questo modo si rende possibile realizzare il bilanciamento della pressione agente sulla tenuta dinamica preservandone la funzionalit? nel tempo. Inoltre, una vite con cavit? passante permette all?occorrenza il passaggio di cavi elettrici, ad esempio utilizzabili per uno o pi? sensori interagenti con la centralina elettronica presente a bordo veicolo o dedicata. According to a further advantageous characteristic of the pump 10 of the invention, the same lid container body 18? ? used both to create the seat of at least one bearing 34 of the driving shaft 22, and for the seat of the dynamic seal and of the bushings 30; there? allows to minimize the alignment errors between these components. In the preferred and non-limiting embodiment shown in the figures, the dynamic seal ? constituted by a front mechanical seal with sliding rings 20, not excluding however the possibility? that said dynamic seal is of another type, for example formed by a lip seal or the like. As mentioned, the driving screw 14 and the driven screws 14? they are preferably hollow (fig. 4), in order to reduce the weight and inertias of the system. In case the cavity? of the driving screw is through and connects the two ends in the axial direction of the screw itself, ? it is possible to create a passage of fluid between the suction chamber and the chamber close to the seal indicated with 39 in figure 3; in this way it is possible to balance the pressure acting on the dynamic seal while preserving its functionality. in time. Also, a screw with cavity? loop allows, if necessary, the passage of electric cables, for example usable for one or more? sensors interacting with the electronic control unit present on board the vehicle or dedicated.
La pompa 10 dell?invenzione pu? essere provvista di un dispositivo di convogliamento del fluido in aspirazione dal relativo condotto 16?, al fine di evitare o ridurre l?impatto nei confronti della vite motrice 14 e migliorare di conseguenza le prestazioni fluidodinamiche; tale dispositivo pu? risultare solidale all?elemento rotante od ogiva 36 (fig. 4) o all?elemento fisso 41 (figura 2). La stessa pompa pu? comprendere due o pi? mandate 16 a livelli di pressione diversi, realizzabili mediante uno o pi? spillamenti intermedi; una soluzione di questo tipo risulta particolarmente utile nel caso in cui con un?unica pompa si volessero alimentare due circuiti con due finalizzazioni diverse; un esempio in proposito riguarda il caso di servizi ausiliari per la prima uscita e di servizi di raffreddamento del motore per la seconda. The pump 10 of the invention can? be provided with a device for conveying the fluid being aspirated from the relative conduit 162, in order to avoid or reduce the impact on the driving screw 14 and consequently improve the fluid dynamic performances; this device can? be integral with the rotating element or ogive 36 (fig. 4) or with the fixed element 41 (figure 2). The same pump can? include two or more sent 16 at different pressure levels, achievable by one or more? intermediate tapping; a solution of this type is particularly useful in the event that a single pump wishes to supply two circuits with two different purposes; an example in this regard concerns the case of auxiliary services for the first outlet and engine cooling services for the second.
L?elettronica di controllo e di potenza, schematizzata con 38 a figura 3, ? disposta quale scheda on-board sul corpo della pompa o, eventualmente, sul motore elettrico 18 o in prossimit? di esso, ed ? vantaggiosamente raffreddata dal fluido elaborato in modo da preservarne le caratteristiche operative e funzionali. Analogamente, la pompa 10 pu? comprendere un sistema di controllo della sovrapressione on-board, schematizzato con 40 a figura 3. The control and power electronics, schematized with 38 in figure 3, ? arranged as an on-board card on the pump body or, possibly, on the electric motor 18 or in the vicinity? of it, and ? advantageously cooled by the processed fluid so as to preserve its operating and functional characteristics. Similarly, the pump 10 can? include an on-board overpressure control system, schematized with 40 in figure 3.
Gli elementi rotanti in numero superiore a tre realizzano portate elaborate superiori a quelle con tre soli elementi rotanti a parit? di velocit? di rotazione; infatti, a parit? di diametro delle viti ? presente una maggiore sezione trasversale di fluido, cosicch? per ottenere le stesse portate a pari numero di giri ? sufficiente una lunghezza minore delle viti stesse. La pompa della presente invenzione elabora di preferenza fluidi come soluzioni di acqua o glicole in varie concentrazioni, fluidi specifici per il raffreddamento del motore o di componenti ausiliari funzionali alle esigenze termiche del veicolo, nonch? per il raffreddamento di componenti elettrici/elettronici funzionali alla propulsione elettrica, ibrida o allo stoccaggio dell?energia in batteria. The rotating elements in a number higher than three realize higher elaborated capacities than those with only three rotating elements in parity? of speed? of rotation; in fact, equal? diameter of the screws? present a greater cross-section of fluid, so that? to obtain the same flow rates at the same number of revolutions ? a shorter length of the screws themselves is sufficient. The pump of the present invention preferably processes fluids such as water or glycol solutions in various concentrations, specific fluids for cooling the engine or auxiliary components functional to the thermal requirements of the vehicle, as well as for cooling electric/electronic components functional to electric propulsion, hybrid or battery energy storage.
Come si pu? rilevare da quanto precede, sono evidenti i vantaggi che l?invenzione consegue. How can you? noting from the foregoing, the advantages which the invention achieves are evident.
La pompa a pi? viti per circuiti di raffreddamento della presente invenzione presenta un?elevata efficienza al variare della velocit? di rotazione e delle condizioni operative, risultando quindi operativamente superiore alle pompe dinamiche tradizionalmente impiegate nel settore motoristico per la circolazione di fluidi e conseguendo il risultato di un minore assorbimento di energia meccanica; infatti, le pompe centrifughe accelerano in eccesso il fluido, le perdite aumentano e, per fornire la stessa prestazione idraulica, richiedono maggiore energia meccanica, posto che le perdite energetiche crescono all?aumentare della velocit? del fluido. Particolarmente vantaggioso ? il fatto che le sedi dei supporti degli elementi rotanti, riferiti al cuscinetto 34 dell?albero 22 e a alla tenuta meccanica frontale 20, siano ricavate direttamente sul corpo 18? del motore elettrico 18, al fine di evitare/minimizzare possibili errori di posizionamento. Ulteriormente, il posizionamento della vite motrice 14 e delle viti condotte 14? ? garantito dal posizionamento dei rispettivi assi attraverso le boccole 30, 32 e il cuscinetto 34. The pump at pi? screws for cooling circuits of the present invention has a high efficiency as the speed varies? of rotation and operating conditions, thus resulting operationally superior to the dynamic pumps traditionally used in the motor sector for the circulation of fluids and achieving the result of a lower absorption of mechanical energy; in fact, the centrifugal pumps accelerate the fluid in excess, the losses increase and, to provide the same hydraulic performance, they require more mechanical energy, given that the energy losses grow as the speed increases. of the fluid. Particularly beneficial? the fact that the seats of the supports of the rotating elements, referring to the bearing 34 of the shaft 22 and to the front mechanical seal 20, are obtained directly on the body 18? of the electric motor 18, in order to avoid/minimize possible positioning errors. Furthermore, the positioning of the driving screw 14 and the driven screws 14? ? guaranteed by the positioning of the respective axes through the bushings 30, 32 and the bearing 34.
Bench? l?invenzione sia stata sopra descritta con particolare riferimento a una sua forma di realizzazione preferita, data a scopo esemplificativo e non limitativo, numerose modifiche e varianti appariranno evidenti a un tecnico del ramo alla luce della descrizione sopra riportata. La presente invenzione, pertanto, intende abbracciare tutte le modifiche e le varianti che rientrano nello spirito e nell?ambito protettivo delle rivendicazioni che seguono. Bench? the invention has been described above with particular reference to a preferred embodiment thereof, given by way of non-limiting example, numerous modifications and variations will appear evident to a person skilled in the art in the light of the above description. The present invention therefore intends to embrace all the modifications and variations which fall within the spirit and protective scope of the claims which follow.
Claims (11)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102020000021280A IT202000021280A1 (en) | 2020-09-09 | 2020-09-09 | MULTI-SCREW PUMP FOR COOLING CIRCUITS |
| EP21020399.8A EP3967882A1 (en) | 2020-09-09 | 2021-08-05 | Multiscrew pump for cooling circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT102020000021280A IT202000021280A1 (en) | 2020-09-09 | 2020-09-09 | MULTI-SCREW PUMP FOR COOLING CIRCUITS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT202000021280A1 true IT202000021280A1 (en) | 2022-03-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT102020000021280A IT202000021280A1 (en) | 2020-09-09 | 2020-09-09 | MULTI-SCREW PUMP FOR COOLING CIRCUITS |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3967882A1 (en) |
| IT (1) | IT202000021280A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115199531A (en) * | 2022-06-17 | 2022-10-18 | 安徽凯特泵业有限公司 | Constant temperature delivery pump |
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| GB718238A (en) * | 1951-10-25 | 1954-11-10 | Imo Industri Ab | Improvements in or relating to screw pumps |
| US4131400A (en) * | 1976-04-27 | 1978-12-26 | Aktiebolaget Imo-Industri | Hydraulic rotary screw machine with axial balancing piston |
| US20020081226A1 (en) * | 2000-12-26 | 2002-06-27 | Jianping Zhong | Thrust load reliever |
| US6443711B1 (en) * | 2000-11-14 | 2002-09-03 | Carrier Corporation | Inlet bearing lubrication for a screw machine |
| EP1475537A1 (en) | 2003-05-08 | 2004-11-10 | Automotive Motion Technology Limited | Screw pump |
| CN201574926U (en) * | 2009-11-30 | 2010-09-08 | 天津泵业机械集团有限公司 | Economic three-screw pump |
| US20150369241A1 (en) * | 2013-03-01 | 2015-12-24 | Netzsch Pumpen & Systeme Gmbh | Screw Pump |
| CN106194719A (en) * | 2016-08-26 | 2016-12-07 | 黄山艾肯机械制造有限公司 | A kind of screw pump of low viscosity high pressure |
| WO2017189022A1 (en) * | 2016-04-29 | 2017-11-02 | Imo Industries, Inc. | Modular thrust-compensating rotor assembly |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH525392A (en) * | 1970-09-08 | 1972-07-15 | Allweiler Ag | Pump unit without stuffing box |
| DE102017218290B4 (en) * | 2017-10-12 | 2021-07-29 | Vitesco Technologies GmbH | Fuel pump and fuel delivery unit |
-
2020
- 2020-09-09 IT IT102020000021280A patent/IT202000021280A1/en unknown
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2021
- 2021-08-05 EP EP21020399.8A patent/EP3967882A1/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2693763A (en) | 1951-10-25 | 1954-11-09 | Laval Steam Turbine Co | Nonpositive screw pump or motor |
| GB718238A (en) * | 1951-10-25 | 1954-11-10 | Imo Industri Ab | Improvements in or relating to screw pumps |
| US4131400A (en) * | 1976-04-27 | 1978-12-26 | Aktiebolaget Imo-Industri | Hydraulic rotary screw machine with axial balancing piston |
| US6443711B1 (en) * | 2000-11-14 | 2002-09-03 | Carrier Corporation | Inlet bearing lubrication for a screw machine |
| US20020081226A1 (en) * | 2000-12-26 | 2002-06-27 | Jianping Zhong | Thrust load reliever |
| EP1475537A1 (en) | 2003-05-08 | 2004-11-10 | Automotive Motion Technology Limited | Screw pump |
| CN201574926U (en) * | 2009-11-30 | 2010-09-08 | 天津泵业机械集团有限公司 | Economic three-screw pump |
| US20150369241A1 (en) * | 2013-03-01 | 2015-12-24 | Netzsch Pumpen & Systeme Gmbh | Screw Pump |
| WO2017189022A1 (en) * | 2016-04-29 | 2017-11-02 | Imo Industries, Inc. | Modular thrust-compensating rotor assembly |
| CN106194719A (en) * | 2016-08-26 | 2016-12-07 | 黄山艾肯机械制造有限公司 | A kind of screw pump of low viscosity high pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| EP3967882A1 (en) | 2022-03-16 |
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