CN110714914A - Roller pump - Google Patents

Roller pump Download PDF

Info

Publication number
CN110714914A
CN110714914A CN201910628970.9A CN201910628970A CN110714914A CN 110714914 A CN110714914 A CN 110714914A CN 201910628970 A CN201910628970 A CN 201910628970A CN 110714914 A CN110714914 A CN 110714914A
Authority
CN
China
Prior art keywords
pump
axis
roller
rotor
pump body
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.)
Pending
Application number
CN201910628970.9A
Other languages
Chinese (zh)
Inventor
C·梅多拉
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of CN110714914A publication Critical patent/CN110714914A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/04—Feeding by means of driven pumps
    • F02M37/045—Arrangements for driving rotary positive-displacement 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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/3441—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F04C2/3445—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation the vanes having the form of rollers, slippers or the like
    • 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
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/08—Rotary pistons
    • F01C21/0809—Construction of vanes or vane holders
    • F01C21/0818—Vane tracking; control therefor
    • 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
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • 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
    • 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
    • F04C2/082—Details specially related to intermeshing engagement type machines or pumps
    • F04C2/084—Toothed wheels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/20—Fluid liquid, i.e. incompressible
    • F04C2210/203—Fuel
    • 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
    • F04C2240/20—Rotors
    • 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
    • F05C2251/12—Magnetic properties

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Massaging Devices (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

The roller pump has a pump body (31) slidably engaged by a rotor (36), the rotor (36) being provided with a plurality of recesses (39), each of the recesses (39) being slidably engaged by a drive roller (40) held in contact with the pump by means of at least one magnetic element (45), said magnetic element (45) being mounted around an inner side wall (34) of said pump body (31).

Description

Roller pump
Technical Field
The present invention relates to a roller pump.
Background
The invention can be used in a particularly advantageous manner in a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, to which the following description will refer in particular without losing its general characteristics.
In the field of pumping units for supplying fuel to an internal combustion engine, it is known to provide a pumping unit comprising: a high-pressure pump, such as a piston pump, for supplying fuel to the internal combustion engine; and a low-pressure pump or a pre-feed pump for feeding fuel from the reservoir to the high-pressure pump.
The low-pressure pump is a roller pump comprising a pump body which in turn comprises a cup-shaped containment casing and a cover for closing the containment casing.
The containment casing is delimited by a substantially flat end wall and a substantially cylindrical inner side wall and houses inside it a rotor mounted so as to be able to rotate about a rotation axis substantially perpendicular to the end wall and parallel to and spaced apart from the longitudinal axis of the inner side wall.
The rotor has a plurality of recesses evenly distributed about the axis of rotation and open outwardly along the outer peripheral edge of the rotor.
Each recess is slidably engaged by a drive roller having a longitudinal axis parallel to the axis of rotation of the rotor and projecting beyond the recess so as to be arranged in contact with the inner side wall of the containment casing.
The drive rollers are distributed about the axis of rotation so as to form a plurality of variable-volume chambers which are connected together in a fluid-tight manner and are moved by the rotor first past the fuel inlet and then past the fuel outlet of the roller pump.
Known roller pumps of the above type have a number of drawbacks, due to the fact that the driving rollers are kept in contact with the inner side walls of the containment casing by the centrifugal force generated by the rotation of the rotor, mainly due to the fact that: when the rotor has a relatively slow rotational speed, the centrifugal forces acting on the drive rollers are relatively small and impair a correct fluid-tight connection between the variable-volume chambers.
Disclosure of Invention
The object of the present invention is to provide a roller pump which does not have the above-mentioned disadvantages and which is simple and inexpensive to manufacture.
According to the present invention, there is provided a roller pump comprising: a pump body; a rotor mounted in the pump body so as to rotate about a rotation axis; a plurality of recesses formed in the rotor so as to internally accommodate respective drive rollers, respectively, which are slidably engaged with the associated recesses and are moved by the rotor about the axis of rotation and along the inner side walls of the pump body, characterized in that the roller pump further comprises a magnetic structure mounted about the inner side walls for urging the drive rollers toward the inner side walls.
The invention also provides a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, the pumping unit comprising a high-pressure pump for feeding fuel to the internal combustion engine and a low-pressure pump for feeding fuel from a reservoir to the high-pressure pump; the low pressure pump is a roller pump according to the invention.
Drawings
The invention will now be described with reference to the accompanying drawings, which show non-limiting examples of embodiments of the invention, and in which:
fig. 1 is a first schematic cross-sectional view of a pumping unit provided with a preferred embodiment of a roller pump according to the present invention, with parts removed for greater clarity;
fig. 2 is a second schematic cross-sectional view of the pumping unit according to fig. 1, with parts removed for greater clarity; and
fig. 3 is a schematic front view of the roller pump of fig. 1 with parts removed for greater clarity.
Detailed Description
With reference to fig. 1 and 2, 1 denotes in its entirety a pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine (not shown).
The pumping unit 1 includes: a high-pressure pump 2 for feeding fuel to the internal combustion engine (not shown); and a low-pressure or pre-feed pump 3 for feeding fuel from a storage container (known and not shown) to said pump 2.
The high-pressure pump 2 is a piston pump comprising a pump body 4, said pump body 4 being provided with a central hole 5 having a longitudinal axis 6, and also with at least one lateral hole 7 (typically a plurality of holes 7 evenly distributed about the axis 6), said lateral hole 7 having a longitudinal axis 8 transversal to the axis 6 and extending radially from said hole 5 towards the outside of the pump body 4.
Each hole 7 is closed by a head 9, said head 9 being arranged in contact with the pump body 4 and having a boss 10 projecting into the hole 7 coaxially to the axis 8.
The head 9 has a central hole 11, said central hole 11 being formed through the head 9 coaxially to the axis 8 and comprising a wider portion 12 and a narrower portion 13 aligned with each other along said axis 8.
The narrower portion 13 faces the bore 5 and defines a cylinder 14 of the high-pressure pump 2.
The cylinder 14 slidably engages a piston 15, said piston 15 being movable in an alternating rectilinear motion due to the thrust of the actuating means 16, said alternating rectilinear motion comprising an oil intake stroke for sucking fuel into the cylinder 14 and a compression stroke for compressing the fuel contained in said cylinder 14.
The device 16 comprises a tubular bush 17, which bush 17 is slidably engaged coaxially with the axis 8 in the hole 7 and extends around the cylinder 14, and has an inner annular flange 18, which inner annular flange 18 projects radially from the inner surface of the bush 17 and divides the bush 17 into two cylindrical portions 19, 20, the cylindrical portion 19 of which faces the hole 5.
The device 16 also has a tappet system 21, said tappet system 21 comprising a coupling block 22 having a substantially cylindrical shape, said coupling block 22 being locked within the portion 19 by means of interference and being arranged in contact with the flange 18 and supporting a tappet system roller 23.
A roller 23 projects from block 22 towards hole 5 and is rotatably coupled with block 22 so as to rotate with respect to said block 22 about its longitudinal axis 24 substantially perpendicular to axis 8.
Flange 18 supports an annular disc 25, which annular disc 25 extends around piston 15 and is inserted, coaxially to axis 8, within portion 20 of bushing 17 and has an outer peripheral edge axially facing flange 18 and an inner peripheral edge axially facing the head of said piston 15.
The device 16 further comprises a compression elastic element 26, said compression elastic element 26 being mounted between the boss 10 and the bush 17 coaxially with the axis 8 and being arranged between the head 9 and the disc 25 so as to displace the disc 25 and normally keep the disc 25 in contact with the flange 18, and the roller 23 being in contact with a cam 27 formed on the outer surface of an intermediate portion of a transmission shaft 28, said transmission shaft 28 being mounted through the hole 5 so as to rotate about the axis 6 with respect to the pump body 4.
The head member 9 internally houses an oil feed valve 29 for drawing fuel into the cylinder 14 and a delivery valve 30 for supplying fuel to an internal combustion engine (not shown).
As shown in fig. 3, the low-pressure or pre-feed pump 3 is a roller pump comprising a pump body 31, the pump body 31 in turn comprising a containment casing 32, said containment casing 32 having a cup-like shape and being delimited by a substantially flat end wall 33 and also by a substantially cylindrical inner side wall 34.
The pump body 31 also comprises a cover 35 (fig. 2) for closing the housing 32 and internally houses a rotor 36, said rotor 36 being mounted so as to be rotatable about an axis 37, said axis 37 being parallel to the longitudinal axis 38 of the wall 34 and spaced apart from the longitudinal axis 38 of the wall 34.
The rotor 36 has a plurality of recesses 39, said recesses 39 being uniformly distributed about the axis 37 and being open outwards along the outer peripheral edge of said rotor 36.
Each recess 39 slidably engages a drive roller 40, said drive roller 40 having a longitudinal axis 41 parallel to axis 37, being made of ferromagnetic metal material and projecting radially outside recess 39 so as to be arranged in contact with wall 34.
The rollers 40 define between them a plurality of variable-volume chambers 42, said variable-volume chambers 42 being connected together in a fluid-tight manner and being moved by the rotor 36 about the axis 37 first through a fuel inlet 43 of the pump 3 and then through a fuel outlet 44 of said pump 3.
Each roller 40 is urged into contact with the wall 34 by centrifugal force generated by rotation of the rotor 36 about the axis 37 and by additional radial force generated by an annular magnet 45 mounted coaxially with the axis 38 about the housing 32.
According to a number of variants not shown:
magnet 45 is mounted within housing 32 coaxially with axis 38;
removing magnet 45 and replacing magnet 45 with a plurality of magnets mounted about housing 32 and distributed about axis 38; and
the magnet 45 is eliminated and the magnet 45 is replaced by a plurality of magnets mounted within the housing 32 and distributed about the axis 38.
The pumping unit 1 offers a number of advantages mainly related to the fact that: the additional radial force generated by the magnets 45 ensures a correct fluid-tight connection between the variable-volume chambers 42, even when the rotor 36 has a relatively low rotational speed.

Claims (8)

1. A roller pump, comprising: a pump body (31); a rotor (36) mounted in the pump body (31) so as to rotate about a rotation axis (37); -a plurality of recesses (39) formed in the rotor (36) so as to internally house respective drive rollers (40), respectively, said drive rollers (40) being slidably engaged with the relative recesses (39) and being moved by the rotor (36) about the rotation axis (37) and along the inner side wall (34) of the pump body (31), characterized in that the roller pump further comprises a magnetic structure (45) mounted about the inner side wall (34) for urging the drive rollers (40) towards said inner side wall (34).
2. The roller pump according to claim 1, wherein the drive roller (40) is made of a ferromagnetic metal material.
3. A roller pump according to claim 1 or 2, wherein the magnetic structure (45) comprises a ring magnet mounted around the pump body (31) and the axis of rotation (37).
4. A roller pump according to claim 1 or 2, wherein the magnetic structure (45) comprises an annular magnet mounted in the pump body (31) about the axis of rotation (37).
5. Roller pump according to claim 1 or 2, wherein the magnetic structure (45) comprises a plurality of magnets distributed around the pump body (31) and the rotation axis (37).
6. A roller pump according to claim 1 or 2, wherein the magnetic structure (45) comprises a plurality of magnets mounted in the pump body (31) and distributed around the rotation axis (37).
7. A roller pump according to any preceding claim, wherein the axis of rotation (37) is parallel to a longitudinal axis (38) of the inner side wall (34) and is spaced from said longitudinal axis (38).
8. A pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine, comprising a high-pressure pump (2) for feeding fuel to the internal combustion engine and a low-pressure pump (3) for feeding fuel from a storage container to the high-pressure pump (2); the low-pressure pump (3) is a roller pump according to any of the preceding claims.
CN201910628970.9A 2018-07-13 2019-07-12 Roller pump Pending CN110714914A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000007163 2018-07-13
IT102018000007163A IT201800007163A1 (en) 2018-07-13 2018-07-13 ROLLER PUMP

Publications (1)

Publication Number Publication Date
CN110714914A true CN110714914A (en) 2020-01-21

Family

ID=63834434

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910628970.9A Pending CN110714914A (en) 2018-07-13 2019-07-12 Roller pump

Country Status (2)

Country Link
CN (1) CN110714914A (en)
IT (1) IT201800007163A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3501545A1 (en) * 1985-01-18 1986-07-24 Robert Bosch Gmbh, 7000 Stuttgart Appliance for conveying fuel from a reservoir to the internal combustion engine of a motor vehicle
DE102005007603A1 (en) * 2005-02-18 2006-08-24 Siemens Ag Vane pump, for pumping fluids, has magnetic components holding vanes in position on inner track of displacement ring

Also Published As

Publication number Publication date
IT201800007163A1 (en) 2020-01-13

Similar Documents

Publication Publication Date Title
CN103850740B (en) Ventilsteuerzeitsteuervorrichtung
US7775193B2 (en) High-pressure pump, in particular for a fuel injection system of an internal combustion engine
CN105637212A (en) High-pressure fuel pump having an outlet valve
JP2008163826A (en) Fuel injection pump
CN110714914A (en) Roller pump
US20190055942A1 (en) Pumping assembly to feed fuel, preferably diesel fuel, to an internal combustion engine
CN100374723C (en) Fuel supply apparatus
CN110714915A (en) Vane pump
JP3816441B2 (en) High pressure fuel supply device
JP2002509224A (en) Radial piston pump for high pressure fuel supply
US10094349B2 (en) Fluid valve assembly
US20200277922A1 (en) Fuel injection pump
WO2016117297A1 (en) High-pressure pump and method for manufacturing same
EP1486664B1 (en) High pressure fuel pump with multiple radial plungers
CN111465762B (en) Pumping unit for feeding fuel, preferably diesel fuel, to an internal combustion engine
WO2017104376A1 (en) Fuel pump unit
EP0821156A3 (en) Fuel pump
EP4042010B1 (en) Pumping unit for feeding a fluid, in particular fuel, preferably diesel fuel, to a user appliance, in particular an internal combustion engine
CN110114577A (en) Electric gear wheel pump
JP4941272B2 (en) pump
JP3700866B2 (en) Hydraulic timer device for fuel injection pump
JPH1018960A (en) Radial plunger pump
JP2006233922A (en) High pressure fuel pump
JP2003336582A (en) Pump device
JPH04137272U (en) radial plunger pump

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20200121

WD01 Invention patent application deemed withdrawn after publication