EP3049622A1 - Pompe à engrenages volumétrique - Google Patents

Pompe à engrenages volumétrique

Info

Publication number
EP3049622A1
EP3049622A1 EP13811014.3A EP13811014A EP3049622A1 EP 3049622 A1 EP3049622 A1 EP 3049622A1 EP 13811014 A EP13811014 A EP 13811014A EP 3049622 A1 EP3049622 A1 EP 3049622A1
Authority
EP
European Patent Office
Prior art keywords
rotor
pump
protuberances
cylindrical body
rotors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13811014.3A
Other languages
German (de)
English (en)
Inventor
Franco TOMMASINI
Gianpiero PANSOLINI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PANSOLINI, GIANPIERO
TOMMASINI, FRANCO
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP3049622A1 publication Critical patent/EP3049622A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/08—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • F01C1/12—Rotary-piston machines or engines of intermeshing engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing of other than internal-axis type
    • F01C1/123—Rotary-piston machines or engines 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 tooth-like elements, extending generally radially from the rotor body cooperating with recesses in the other rotor, e.g. one tooth
    • 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
    • F04C15/0088—Lubrication
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/123—Rotary-piston pumps specially adapted for elastic fluids 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 radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth
    • 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
    • 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
    • F04C2/123—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 radially or approximately radially from the rotor body extending tooth-like elements, co-operating with recesses in the other rotor, e.g. one tooth
    • 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
    • F04C2/20—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 dissimilar tooth forms
    • 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
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/005—Axial sealings for working fluid
    • F04C27/006—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type pumps, e.g. gear 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • 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
    • F04C15/0023—Axial sealings for working fluid
    • F04C15/0026—Elements specially adapted for sealing of the lateral faces of intermeshing-engagement type machines or pumps, e.g. gear machines or pumps

Definitions

  • the present patent application for industrial invention relates to a positive displacement gear pump.
  • Fig. 1 shows a positive displacement gear pump according to the prior art, generally indicated with reference numeral (101 ).
  • the pump (101 ) comprises a casing (102) with suction pipe (I) and discharge pipe (O).
  • Two identical rotors (103) are mounted inside the casing (102).
  • Each rotor (103) comprises a gear composed of a toothed wheel.
  • Each rotor comprises a plurality of linear or helicoidal teeth (130) that define a plurality of cavities (131 ) between said teeth (130).
  • the two gears (103) are engaged in such manner that the teeth (130) of one gear are engaged into the cavities (131 ) of the other gear, and vice versa. So the fluid enters the suction pipe (I) and comes out of the discharge pipe (O).
  • Vane pumps are additionally known, comprising a rotor provided with cavity in which vanes slide radially.
  • the rotor is mounted eccentrically with respect to the seat of the casing where it is housed and the vanes are stressed by springs or by the centrifugal force towards the surface of the rotor housing.
  • Said vane pumps permit a limited number of revolutions, cause early wear of vanes and require oil lubrication and consequently a separator to separate oil from the fluid treated by the pump.
  • the purpose of the present invention is to overcome the drawbacks of the prior art, by disclosing a positive displacement gear pump capable of avoiding fluid encapsulation.
  • Another purpose of the present invention is to obtain such a positive displacement gear pump that is able to operate with a high number of revolutions and is extremely reliable and safe.
  • the positive displacement pump of the invention comprises:
  • a casing that comprises a central body and two closing lids, said central body being provided with two communicating cylindrical chambers, one suction pipe and one discharge pipe, and
  • the two rotors comprise:
  • the male rotor is engaged with the female rotor, i.e. the protuberances of the male rotor are engaged in the cavities of the female rotor without contact between the two rotors.
  • Fig. 1 is cross-sectional view of a positive displacement gear pump according to the prior art
  • Fig. 2 is an exploded perspective view of the positive displacement gear pump according to the invention
  • Fig. 3 is a cross-sectional view of the pump of Fig. 2 in assembled condition
  • Fig. 4 is an exploded view of a male rotor of the pump shown in Fig. 2;
  • Fig. 5 is an exploded perspective view of an additional embodiment of the pump shown in Fig. 2.
  • a positive displacement pump according to the invention is disclosed, generally indicated with reference numeral (1 ).
  • the pump (1 ) comprises a casing provided with central body (2) sealed by means of two plate-shaped closing lids (20).
  • the central body (2) comprises two communicating cylindrical chambers (22; 23) in such manner to form a basically 8-shaped opening that is closed by the two lids (20).
  • the central body is provided with two pipes (I, O) in communication with outside, respectively to suck and discharge the fluid treated by the pump.
  • a male rotor (3) and a female rotor (4) are disposed in the cylindrical chambers (22, 23) of the central body.
  • the male rotor (3) comprises only protuberances (30), not cavities.
  • the female rotor (4) comprises only cavities (40), not teeth or protuberances.
  • the male rotor (3) is engaged with the female rotor, i.e. the protuberances (30) of the male rotor are engaged in the cavities (40) of the female rotor without contact between the two rotors.
  • the male and female rotors (3, 4) are mounted on corresponding shafts (5, 6).
  • the shafts (5, 6) of the rotors are revolvingly supported on supports (bushes or bearings, not shown in the figures) provided in the seats (24) of the lids (20).
  • the shaft (6) of the female rotor is connected to a drive shaft. Therefore, the female rotor (4) is the driving gear and the male rotor (3) is the driven gear.
  • the shaft (5) of the male rotor can be connected to a drive shaft.
  • both shafts (6, 5) of the rotors can be simultaneously connected to two drive shafts in such manner to obtain better torque distribution.
  • the pipes (I, O) of the central body can act as suction pipe or discharge pipe.
  • two external gears (7, 8) are disposed outside the casing and keyed to the shafts (5, 6) of the rotors.
  • the external gears (7, 8) are engaging toothed wheels.
  • the external gears allow for phasing the male and female rotors (3, 4), meaning that during the rotation of the two rotors, the protuberances (30) of the male rotor enter the cavities (40) of the female rotor.
  • the male rotor (3) comprises a cylindrical body (35) and a plurality of protuberances (30) radially protruding from the cylindrical body (35).
  • Each protuberance (30) cross-sectionally comprises two involute- shaped sides (31 , 32) converging into a rounded head (33).
  • the two sides (31 , 32) of a protuberance are symmetrical with respect to a radial axis of symmetry passing through the head (32) of the protuberance.
  • the male rotor (3) comprises two protuberances (30) in diametrally opposite positions.
  • the chamber (22) of the central body of the casing defines a suction area (A) in communication with the suction pipe (I) and a discharge area (B) in communication with the discharge pipe (O).
  • the female rotor (4) comprises a cylindrical body (45) wherein a plurality of radially extending cavities (40) is obtained.
  • Each cavity (40) cross- sectionally comprises two involute-shaped sides (41 , 42) joined into a bottom surface (43) with concave shape.
  • the profiles of the two sides (41 , 42) of the cavity are not symmetrical with respect to a radial straight line passing through the bottom of the cavity.
  • the involute-shaped profile of the inlet side (41 ) has a higher curvature than the involute-shaped profile of the outlet side
  • the female rotor (4) comprises two cavities (40) in diametrally opposite positions.
  • the heads (33) of the protuberances of the male rotor are very close to the internal surface of the cylindrical chamber (22). During operation, the heads (33) of the protuberances of the male rotor arrive at a short distance from the bottom (43) of the cavity, thus avoiding the passage of liquid. However, the heads (32) do not touch the internal surface of the cylindrical chamber (22) or the bottom (43) of the cavity.
  • the external surface of the cylindrical body (45) of the female rotor is almost tangent to the internal surface of the cylindrical chamber (23) of the central body of the casing, in such manner to avoid the passage of liquid.
  • the male rotor (3) and female rotor (4) are perfectly centered in the corresponding cylindrical chambers (22, 23) in such manner to leave a tolerance space of 0.05 mm, preferably 0.02 mm, between the following parts:
  • Fig. 3 shows an additional embodiment, wherein the head diameter
  • the diameter of the cylindrical body (35) of the male rotor can be identical to the diameter of the cylindrical body (45) of the female rotor.
  • the peripheral speed of the two cylindrical bodies (35, 45) of the two rotors is identical and the tolerance between cylindrical bodies (35, 45) of the two rotors may be zero, thus allowing for contact between the cylindrical bodies (35, 45) of the two rotors during rotation. Consequently, losses are minimized and high rotational speeds are allowed.
  • the chamber (22) that houses the male rotor (3) is larger than the chamber (23) that houses the female rotor (4), thus increasing the delivery capacity of the pump (1 ), while maintaining the same size of the protuberance module (31 ).
  • the male rotor (3) can be made in different parts that are mutually assembled.
  • seats (36) are obtained in the cylindrical body (35), cross-sectionally having a substantially C-shaped or dovetail profile.
  • the protuberances (30) consist in sectors provided with a substantially parallelepiped base (34) that is engaged into the seat (36).
  • the base (34) of the protuberance can be provided with ribs or grooves (34') that are engaged with corresponding ribs or grooves (36') provided in the seat (36) of the cylindrical body of the male rotor.
  • the entire rotors (3, 4) or only the protuberances (30) and/or cavities (40) can undergo thermal and/or chemical treatments and can be coated with suitable materials, such as hard metal, Widia, rubber, plastics, Teflon or ceramic.
  • the pump (1 ) also comprises two seal gaskets (9) composed of 8-shaped plates made of anti-friction self-lubricating material.
  • the seal gaskets (9) are disposed between the central body (2) and the lids (20).
  • the surface of the lids facing towards the central body is provided with suitable recessed seats (25) adapted to house the seal gaskets (9).
  • Springs (90) are disposed in the seats (25) of the lids in such manner to stress the seal gaskets (9) towards the central body.
  • the seal gaskets (9) are stopped against the planar sides of the male and female rotors (3, 4).
  • Such a solution provides for tightness of the chambers (22, 23) obtained inside the central body (20), thus avoiding losses due to construction tolerance.
  • the pump (1 ) can be used at a high number of revolutions, without oil and with minimum wear for mechanical moving parts.

Landscapes

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

Abstract

L'invention porte sur une pompe volumétrique (1), qui comprend un carter ayant un corps central (2) et deux couvercles de fermeture (20), ledit corps central (2) étant pourvu de deux chambres communicantes cylindriques (22, 23), un tuyau d'aspiration (I) et un tuyau de décharge (O), et deux rotors (3, 4) montés de façon à pouvoir tourner dans lesdites chambres (22, 23) du corps central et portés par des arbres (5, 6) montés rotatifs dans lesdits couvercles de fermeture (20). Les deux rotors comprennent : un rotor mâle (3) comprenant uniquement des protubérances (30) et non des cavités, et un rotor femelle (4) comprenant uniquement des cavités (40), et non des dents ou des protubérances.
EP13811014.3A 2013-09-27 2013-09-27 Pompe à engrenages volumétrique Withdrawn EP3049622A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IT2013/000260 WO2015044969A1 (fr) 2013-09-27 2013-09-27 Pompe à engrenages volumétrique

Publications (1)

Publication Number Publication Date
EP3049622A1 true EP3049622A1 (fr) 2016-08-03

Family

ID=49817191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13811014.3A Withdrawn EP3049622A1 (fr) 2013-09-27 2013-09-27 Pompe à engrenages volumétrique

Country Status (7)

Country Link
US (1) US20160230760A1 (fr)
EP (1) EP3049622A1 (fr)
CN (1) CN105593467A (fr)
CA (1) CA2924421A1 (fr)
CH (1) CH708632B1 (fr)
RU (1) RU2638113C2 (fr)
WO (1) WO2015044969A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107476827A (zh) * 2017-10-13 2017-12-15 封海涛 新型旋转蒸汽发动机
US10731701B2 (en) * 2018-07-23 2020-08-04 Hamilton Sunstrand Corporation High efficiency gear pump bearing assembly
CN108953147A (zh) * 2018-07-28 2018-12-07 周信城 凸轮压缩机
KR102311679B1 (ko) * 2020-03-11 2021-10-08 김찬원 고농도 슬러지 이송용 자흡식 진공강 펌프

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1052045A (en) * 1912-02-20 1913-02-04 Andrew G Doedyns Rotary engine.
GB749569A (en) * 1954-04-15 1956-05-30 Karsten Alfred Ovretveit Improvements in or relating to rotary fluid pumps and motors and the like
BE546159A (fr) * 1955-04-01
US4526518A (en) * 1981-07-23 1985-07-02 Facet Enterprises, Inc. Fuel pump with magnetic drive
US4457680A (en) * 1983-04-27 1984-07-03 Paget Win W Rotary compressor
IT1287464B1 (it) * 1996-07-29 1998-08-06 Giovanni Morselli Macchina volumetrica rotativa
US6129067A (en) * 1997-11-28 2000-10-10 Riley; Thomas Rotary engine
US8517706B2 (en) * 2002-05-06 2013-08-27 Jerome R. Lurtz Non-eccentric engine
US9394901B2 (en) * 2010-06-16 2016-07-19 Kevin Thomas Hill Pumping systems
RU2458251C2 (ru) * 2010-10-19 2012-08-10 Сергей Васильевич Алешин Компрессор

Also Published As

Publication number Publication date
CH708632B1 (it) 2018-06-29
WO2015044969A8 (fr) 2015-10-22
US20160230760A1 (en) 2016-08-11
WO2015044969A1 (fr) 2015-04-02
CH708632A2 (it) 2015-03-31
RU2638113C2 (ru) 2017-12-11
CN105593467A (zh) 2016-05-18
CA2924421A1 (fr) 2015-04-02
RU2016115597A (ru) 2017-10-26

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