GB2538711A - Damper for high pressure fuel pump - Google Patents

Damper for high pressure fuel pump Download PDF

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Publication number
GB2538711A
GB2538711A GB1508869.3A GB201508869A GB2538711A GB 2538711 A GB2538711 A GB 2538711A GB 201508869 A GB201508869 A GB 201508869A GB 2538711 A GB2538711 A GB 2538711A
Authority
GB
United Kingdom
Prior art keywords
fuel
damper assembly
hose
chamber
damper
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Withdrawn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
GB1508869.3A
Other versions
GB201508869D0 (en
Inventor
Aye Andreas
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.)
BorgWarner Luxembourg Automotive Systems SA
Original Assignee
Delphi Automotive Systems Luxembourg SA
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 Delphi Automotive Systems Luxembourg SA filed Critical Delphi Automotive Systems Luxembourg SA
Priority to GB1508869.3A priority Critical patent/GB2538711A/en
Publication of GB201508869D0 publication Critical patent/GB201508869D0/en
Publication of GB2538711A publication Critical patent/GB2538711A/en
Withdrawn legal-status Critical Current

Links

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
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0041—Means for damping pressure pulsations
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/04—Means for damping vibrations or pressure fluctuations in injection pump inlets or outlets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
    • F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
    • F04B11/0016—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators with a fluid spring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/001—Noise damping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
    • F15B21/008—Reduction of noise or vibration

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Analytical Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

A damper assembly 22 of gasoline direct injection (GDI) equipment is adapted to be arranged in a low pressure line prior to reaching a high pressure fuel pump or may be integral with the pump. The damper assembly 22 comprises a chamber 40 with fuel inlet 48 and fuel outlet 50, and a pulsation pressure damper member 52 arranged in the chamber 40. The pulsation pressure damper member 52 varies its volume under the influence of pressure waves. The pulsation pressure damper member 52 may be a flexible, eg rubber, hose 54 through which the fuel flows, fig.3, the chamber 40 itself being filled with air. The hose 54 may be coiled inside the chamber 40. Alternatively, pulsation pressure damper member 52 may be one or more closed lengths of flexible hose eg in the form of concentric rings, fig.4, or coiled or folded (figs.6-9), the hoses being filled with air or inert gas and fuel flowing through the chamber 40 outside the hoses 54.

Description

DAMPER FOR HIGH PRESSURE FUEL PUMP
TECHNICAL FIELD
The present invention relates to a high pressure pump used in gasoline direct injection equipment and, more particularly to the damper of said pump
BACKGROUND OF THE INVENTION
Part of gasoline direct injection equipment 10, also known as GDI, is represented on figure 1. The equipment 10 comprises a low pressure line 12 where fuel is sucked from a low pressure reservoir 14 by a low pressure pump 16 which flows the fuel toward a high pressure pump 18, which in turn sends it via a high pressure line 20 to a high pressure reservoir, not represented, before distribution to a plurality of fuel injectors, not represented, spraying the fuel in combustion chambers.
The high pressure pump 18 pressurizes fuel by means of a reciprocating cam driven plunger 28 varying the volumetric capacity of a compression chamber 30 wherein fuel flowing in the low pressure line 12 enters the compression chamber 30 via an inlet opening 32 controlled by an inlet valve 34 and flows out at high pressure via an outlet opening 36 controlled by an outlet valve 38.
The fuel delivery to the high pressure line 20 is controlled by actuation of the inlet valve 34. For certain engine operating conditions, the inlet valve 34 has to be kept open leading to a continuous reversal of the flow back and forth to and from the low pressure feed line 12 due to the cam driven plunger and, pressure waves generated by the high pressure pump 18 are amortized and attenuated by a damper 22 arranged in the low pressure line 12 just before the high pressure pump 18. The damper 22 comprises a fuel chamber 24 through which flows the fuel and, in said chamber 24 is arranged a circular capsule 26 made of two diaphragms filed with pressurized inert gas. Upon influences of the pressure waves the diaphragms deflects and the capsule 26 varies volume and damps the flow entering the pressurization pump.
US2013/0230417 and EP1701031 are described similar arrangements or, with two capsules 26. Other arrangements with three or more capsule also exist.
W02012/047283 and W02015/011545 detail several arrangements of capsules 22 and methods to manufacture thereof Whatever the alternative, the manufacturing and arrangement of said capsules 26 remain technically complex and economically expensive.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to resolve the above mentioned problems in providing a damper assembly of a direct injection GDI equipment, the damper assembly being adapted to be arranged in a low pressure line prior to reaching a high pressure fuel pump. The damper assembly comprises a fuel chamber with fuel inlet and fuel outlet, and a pulsation pressure damper member arranged in said fuel chamber.
Furthermore, the pulsation pressure damper member is adapted to vary its volume under the influence of pressure waves.
The pulsation pressure damper member also comprises a flexible hose wrapped inside the fuel chamber and, the flexile hose may be coiled inside the fuel chamber.
Alternatively, the flexile hose may be folded inside the fuel chamber, the hose having a plurality of pleats substantially parallels.
In another embodiment, the flexile hose is randomly arranged inside the fuel 20 chamber.
Whatever the embodiment, the flexible hose may be arranged so that the fuel flows inside the flexible hose.
Particularly, the flexible hose may define an inner closed volume filled with ambient air, or with pressurized inert gas, while low pressure fuel flows in the fuel chamber outside the hose.
The flexible hose may also form a closed ring.
In another arrangement, the pulsation pressure damper member may comprise a plurality of closed rings concentrically arranged.
The flexible hose may be made of polymers or elastomers or any rubber type material. The material of the flexible hose has hardness comprised between Shore 50A and Shore 70A, preferably Shore 60A.
The flexible hose has a total free length comprised between 120 mm and 200 mm.
In other arrangements, the pulsation pressure damper member can comprise several distinct flexible hose.
The invention also extends to a high pressure fuel pump adapted to pressurize fuel by means of a reciprocating plunger varying the volumetric capacity of a compression chamber, the the] flowing in a low pressure line entering said compression chamber via an inlet opening controlled by an inlet valve and flowing out at high pressure via an outlet opening controlled by an outlet valve. The pump is further provided with a damper assembly being as described in the above paragraphs, the fuel outlet of the fuel chamber being in fluid communication with the inlet opening.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying drawings in which: Figure 1 is a schematic representation of a GDI equipment provided with a high pressure pump having a damper of the prior art.
Figures 2 and 5 are bottom views of four arrangements of a damper as per the invention.
Figures 6 to 9 are five alternative sketches presenting alternative arrangements of the damper.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In figure 1, a gasoline direct injection equipment GDI 10 comprises a low pressure pump 16 that sucks fuel in a low pressure reservoir 14 and flows it at a few bars pressure in a low pressure line 12 toward a high pressure pump 18 which, in turn pressurizes it prior to send the fuel in a high pressure line 20 to a high pressure reservoir, not represented, before distribution to a plurality of fuel injectors, not represented, spraying the fuel in combustion chambers.
The high pressure pump 18 pressurizes fuel by means of a reciprocating plunger 28 varying the volumetric capacity of a compression chamber 30. Fuel flowing in the low pressure line 12 enters said compression chamber 30 via an inlet opening 32 controlled by an inlet valve 34 and flows out, at high pressure, via an outlet opening 36 controlled by an outlet valve 38. At the end of the low pressure line 12, just before getting to the inlet valve 34, the high pressure pump 18 is provided with a damper assembly 22. In the example shown on figure 1, the damper assembly 22 is integral to the pump 18.
The damper assembly 22 comprises a hollow body 40 having a cylindrical peripheral wall 42 extending between a floor 44 and an upper wall 46 so defining a fuel chamber 24 wherein fuel enters via an inlet opening 48 arranged in the peripheral wall 42, then exits via an outlet opening 50 arranged in the floor 44 of said fuel chamber 24. The body 40 of the damper assembly 22 is integral, or fixed, to the body of the high pressure pump 18 and, the outlet opening 50 of the fuel chamber directly opens in the inlet opening 32 of the high pressure pump.
Multiple alternative exist with various arrangements for the position and the form of the damper and the fuel chamber as well as for the location of the inlet and outlet openings.
Pressure waves generated by the reverse flow coming from the compression chamber 18enter the fuel chamber 24 where, to amortize them, is arranged a pulsation pressure damper member 52 adapted to vary its volume under the influences of said waves. The pulsation pressure damper member 52 comprises a flexible hose 54, a first embodiment of which is presented in figure 2.
In this first embodiment, the flexible hose 54 is concentrically coiled over one and a half turn inside the fuel chamber 24, a first extremity 56 of the hose is connected to the inlet opening 48 of the fuel chamber and, the second extremity 58 of the hose is connected to the outlet opening 50 of the fuel chamber for an inner fuel flow arrangement.
Since figure 2 is a bottom view section; the floor 44 of the fuel chamber 24 is "removed" enabling viewing at the inside of the fuel chamber 24 and at the arrangement of the hose 54, which second extremity 58 seems to be open while in fact it is connected to the outlet opening 50 of the fuel chamber.
Excellent damping performances have been observed where the section of the peripheral wall 42 has an inner diameter of about 40mm, the rubber hose 54 has a free length of 160mm, an outer diameter of 6mm and an inner diameter of 4mm. The material of the flexible hose is a rubber having a hardness of 60 Shore A. Other materials, for instance of the family of polymers or elastomers, having similar elastic properties, can also be utilized. The space of the fuel chamber 24 not occupied by the hose 54 is filled with air at ambient pressure.
In operation, the fuel flows inside the hose 54 which then varies its cross section as a function of the pulsations of the pressure waves entering the hose. The rubber material enables flexibility and elasticity ensuring that the energy carried by the pressure waves force the section of the hose to enlarge, or to shrink, and the rubber to stretch, therefore absorbing said energy and amortizing said waves.
An alternative to the first embodiment is presented on the top view of figure 3 where the upper wall 46 of the fuel chamber has been removed enabling to observe the arrangement of the rubber hose 54 that is coiled as in the first embodiment but as it is also slightly longer, the coil goes on for two complete turns and, the second extremity 58 passes over a portion the hose in order to reach the outlet opening 50 of the chamber.
This illustrates that the damping characteristics can easily be tuned and adapted via the choice of appropriate dimensions of the hose 54 or material properties.
A second embodiment is presented on figure 4 with an alternative on figure 5. Figure 4 is an axial section of the fuel chamber 24 enabling to view half the peripheral wall 42 with the inlet opening 48, half of the floor 44, the section plan going through the outlet opening 50. As visible on figure 4, the pulsation pressure damper member 52 comprises two rubber hoses making two distinct closed rings, for an outer fuel flow arrangement, each being filled with ambient air or pressurized with inert gas such as helium or nitrogen pressurized as required for the application. The pressure inside the damper member 52, tests have been successfully performed with a 1.5 bar pressure, is a function of a plurality of operating parameters such as maximum reversal volume, operating pressure of the feed line pump, hose diameter, thickness, length, rubber hardness... The rings are concentrically arranged on the floor 44 of the fuel chamber and, the fuel flows in the chamber 24 outside the hoses 54. Under the influence of the pressure waves, the rubber rings retract, or expand, adapting the volume occupied by the fuel the chamber and absorbing the pressure peaks.
In the alternative of figure 5, the pulsation pressure damper member 52 comprises three rubber hoses making three distinct closed rings filled with ambient air or with pressurized inert gas.
Comparing the figures 4 and 5, it is visible that, to achieve similar performances, fewer rings there are, bigger they are and, on figure 4 are shown hoses having an elongated section while the rings of figure 5 have a section more circular, anyway the packaging will determine the optimum geometry and material selection.
In other embodiments, the pulsation pressure damper member 52 comprises a rubber hose 54 extending between two closed extremity, the hose 54 is filed with filled with pressurized inert gas and is arranged in the fuel chamber 24. Various possible arrangements are sketched on figures 6 to 9.
For example, the hose 54 of figure 6 is concentrically coiled and, this arrangement can either be used for inner fuel flow, as in the first embodiment or, with closed ends for outer fuel flow.
The hose of figure 7 follows a serpentine and, as previously mentioned, it either be used for inner or outer fuel flow. In said arrangement, the hose 54 is folded and it has a plurality of pleats substantially parallels to each others.
The arrangement of figure 8 represents a mix where the hose describes a circle as well as a small serpentine.
The arrangement of figure 9 represents a pulsation pressure damper member 52 comprising two distinct hoses, each being closed at both ends to enable outer fuel flow in the fuel chamber 24. The hoses are concentrically coiled are one is arranged on the top of the other.
These sketches are just few examples of the multitude of possible arrangements.
LIST OF REFERENCES
gasoline direct injection equipment (GDI) 12 low pressure line 14 low pressure reservoir 16 low pressure pump 18 high pressure pump high pressure line 22 damper assembly 24 fuel chamber 26 capsule 28 plunger compression chamber 32 inlet opening of the high pressure pump 34 inlet valve 36 outlet opening of the high pressure pump 38 outlet valve hollow body of the damper assembly 42 peripheral wall 44 floor 46 upper wall 48 inlet opening of the fuel chamber outlet opening of the fuel chamber 52 pulsation pressure damper member 54 flexible hose 56 first extremity 58 second extremity

Claims (2)

  1. CLAIMS: Damper assembly (22) of a direct injection (GDI) equipment (10), the damper assembly (22) being adapted to be arranged in a low pressure line (12) prior to reaching a high pressure fuel pump (18), the damper assembly (22) comprising a fuel chamber (24) with fuel inlet (48) and fuel outlet (50), and a pulsation pressure damper member (52) arranged in said fuel chamber (24), characterized in that the pulsation pressure damper member (52) is adapted to vary its volume under the influence of pressure waves.
  2. 2. Damper assembly (22) as claimed in claim 1 wherein the pulsation pressure damper member (52) comprises a flexible hose (54) wrapped inside the fuel chamber (24).
    3 Damper assembly (22) as claimed in claim 2 wherein the flexile hose (54) is coiled inside the fuel chamber (24) 4. Damper assembly (22) as claimed in claim 2 wherein the flexile hose (54) is folded inside the fuel chamber (24), the hose (54) having a plurality of pleats substantially parallels 5. Damper assembly (22) as claimed in claim 2 wherein the flexile hose (54) is randomly arranged inside the fuel chamber (24).6. Damper assembly (22) as claimed in anyone of the claims 2 to 5 wherein the flexible hose (54) is arranged so that the fuel flows inside the flexible hose (54).7. Damper assembly (22) as claimed in any of the claims 2 to 5 wherein the flexible hose (54) defines an inner closed volume filled with ambient air or with pressurized inert gas, while low pressure fuel flows in the fuel chamber (24) outside the hose (54).8. Damper assembly (22) as claimed in claim 7 wherein the flexible hose (54) forms a closed ring.9 Damper assembly (22) as claimed in claim 7 wherein the pulsation pressure damper member (52) comprises a plurality of closed rings concentrically arranged.10. Damper assembly (22) as claimed in anyone of the claims 2 to 9 wherein the flexible hose (54) is made of polymers or elastomers or rubber.1L Damper assembly (22) as claimed in claim 10 wherein the material of the flexible hose (54) has hardness comprised between 50 Shore A and 70 Shore A, preferably 60 Shore A. 12. Damper assembly (22) as claimed in anyone of the claims 2 to 11 wherein the flexible hose (54) has a total free length comprised between 120 and 200 mm.13. Damper assembly (22) as claimed in anyone of the preceding claims wherein the pulsation pressure damper member (52) comprises several distinct flexible hose (54).14. High pressure fuel pump (18) adapted to pressurize fuel by means of a reciprocating plunger (28) varying the volumetric capacity of a compression chamber (30) wherein fuel flowing in a low pressure line (12) enters said compression chamber (30) via an inlet opening (32) controlled by an inlet valve (34) and flows out at high pressure via an outlet opening (36) controlled by an outlet valve (38), the pump (18) being further provided with a damper assembly (22) being as claimed as in any of the preceding claims, the fuel outlet (50) of the fuel chamber (24) being in fluid communication with the inlet opening (32).
GB1508869.3A 2015-05-22 2015-05-22 Damper for high pressure fuel pump Withdrawn GB2538711A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1508869.3A GB2538711A (en) 2015-05-22 2015-05-22 Damper for high pressure fuel pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1508869.3A GB2538711A (en) 2015-05-22 2015-05-22 Damper for high pressure fuel pump

Publications (2)

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GB201508869D0 GB201508869D0 (en) 2015-07-01
GB2538711A true GB2538711A (en) 2016-11-30

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GB1508869.3A Withdrawn GB2538711A (en) 2015-05-22 2015-05-22 Damper for high pressure fuel pump

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2578166A (en) * 2018-10-19 2020-04-22 Delphi Tech Ip Ltd A fuel pump

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3621882A (en) * 1970-02-25 1971-11-23 Harry P Kupiec Inline, through-flow pressure compensator and accumulator
DE2924796A1 (en) * 1979-06-20 1981-01-22 Bosch Gmbh Robert Damper for fuel injection pulsating flow - has evacuated resilient box inside chamber connected in injection circuit
DE3118511A1 (en) * 1981-05-09 1982-12-02 Bosch Gmbh Robert Device for the damping of liquid oscillations
DE3152861A1 (en) * 1981-05-14 1983-08-18 Robert Bosch Gmbh, 7000 Stuttgart Damper element
NL1016384C2 (en) * 2000-10-11 2002-04-12 Helvoet B V Device for damping pressure fluctuations in fuel flow through conduit comprises housing with space divided by membrane into at least first and second chambers
EP1617072A2 (en) * 2004-07-17 2006-01-18 Robert Bosch Gmbh Fuel-injection device for an internal combustion engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3621882A (en) * 1970-02-25 1971-11-23 Harry P Kupiec Inline, through-flow pressure compensator and accumulator
DE2924796A1 (en) * 1979-06-20 1981-01-22 Bosch Gmbh Robert Damper for fuel injection pulsating flow - has evacuated resilient box inside chamber connected in injection circuit
DE3118511A1 (en) * 1981-05-09 1982-12-02 Bosch Gmbh Robert Device for the damping of liquid oscillations
DE3152861A1 (en) * 1981-05-14 1983-08-18 Robert Bosch Gmbh, 7000 Stuttgart Damper element
NL1016384C2 (en) * 2000-10-11 2002-04-12 Helvoet B V Device for damping pressure fluctuations in fuel flow through conduit comprises housing with space divided by membrane into at least first and second chambers
EP1617072A2 (en) * 2004-07-17 2006-01-18 Robert Bosch Gmbh Fuel-injection device for an internal combustion engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2578166A (en) * 2018-10-19 2020-04-22 Delphi Tech Ip Ltd A fuel pump
GB2578166B (en) * 2018-10-19 2021-03-24 Delphi Tech Ip Ltd Fuel pump with an outlet valve having an integral damper

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