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
  • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
  • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
  • F02M55/025—Common rails
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y80/00—Products made by additive manufacturing
• • 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
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
  • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations
• • 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
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
• • 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
  • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
  • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly

Definitions

• High-pressure accumulator and method for producing a high-pressure accumulator The present invention relates to a high-pressure accumulator, in particular for a high-pressure accumulator
• the invention relates to a method for producing such a high-pressure accumulator.
• the invention relates to a high-pressure accumulator, in particular for a
• Injection system for injecting fuel under high pressure into the combustion chamber of an internal combustion engine and a method for producing such a high-pressure accumulator.
• High-pressure accumulator are known from the prior art, for example from DE 10 2008 040 901 AI.
• the known high-pressure accumulator has a storage space for storing high-pressure fuel. Furthermore, in addition to the pump and injector-side connections
• the two add-on components are rail pressure sensor and pressure control valve or
• Pressure relief valve attached to the high-pressure accumulator.
• the injection system in particular the high-pressure accumulator and the injectors are so far sensitive to pressure oscillations, as these the
• the high-pressure accumulator according to the invention for internal combustion engines has a reduced load and consequently a longer service life.
• the high-pressure accumulator comprises a storage tube with a in the
• the high-pressure accumulator has a supply port for supplying high-pressure fuel and at least one discharge port for discharging high-pressure fuel.
• a honeycomb structure is arranged in the storage space.
• honeycomb structure acts as a throttle in a fast flow through the storage space, as it is present at open discharge ports, and thus dampens pressure oscillations in the storage space but also in the
• the honeycomb structure can also be designed so that it stiffened the storage tube and thereby increases the strength of the high-pressure accumulator.
• the storage tube and the honeycomb structure are made in one piece.
• the high-pressure accumulator is designed particularly rigid.
• the high-pressure accumulator is produced by the 3D printing process, a conventional casting process is not suitable for this purpose.
• the honeycomb structure comprises at least one, but preferably 10 to 15 disks, wherein a plurality of honeycomb-shaped recesses are formed in each disk. This will be the
• the discs are each lined up with the same axial distance one after the other.
• the throttle points are arranged at equal intervals in the axial direction of the storage space. The pressure oscillations in the storage space are damped evenly.
• the recesses have the basic shape of a regular hexagon. This is a particularly favorable throttle geometry with a comparatively low weight.
• circular holes do not have a constant ridge width between the holes and therefore require locally high accumulations of material.
• the edge length of the regular hexagon is 0.75 mm. This is particularly well suited for a diameter of the substantially cylindrical storage space of about 10 mm.
• the honeycomb structure comprises at least one, but preferably 10 to 15 Wabenkelche.
• Wabenkelch a plurality of honeycomb-shaped recesses are formed. This will be the
• each Wabenkelch has a head portion whose
• Diameter corresponds to the diameter of the storage space, preferably about 10 mm.
• each Wabenkelch has a tapered foot area. The taper along the axial axis may be conical or
• the cup shape is a very good compromise of good flow, good damping function, high stiffness and low weight.
• the Wabenkelche are arranged so that in each case a head portion with a head portion of the next Wabenkelchs and corresponding to a foot area with a foot portion of the subsequent
• Wabenkelchs interacts.
• the Wabenkelche are thus in series arranged that when flowing through the two adjacent head regions, a strong damping of pressure oscillations takes place.
• the rigidity of the high-pressure accumulator is also considerably increased in the axial direction by such an arrangement.
• the Wabenkelche have a length of 5 mm.
• the recesses have the basic shape of a regular hexagon. This is a particularly favorable throttle geometry with a comparatively low weight.
• circular holes do not have a constant ridge width between the holes and therefore require locally high accumulations of material.
• the edge length of the regular hexagon is 0.75 mm. This is particularly well suited for a storage space diameter of about 10 mm.
• the production of the high-pressure accumulator described above is carried out with the 3D printing process, which allows the production of such geometries in the first place cost.
• FIG. 1 schematically shows a high-pressure accumulator in longitudinal section, as known from the prior art
• Fig. 2 shows a detail of a half-model of an inventive
• Fig. 3 shows a detail of another invention
• High-pressure accumulator as a half-model in a perspective view, with only the essential areas are shown.
• Fig.l 1 In the longitudinal section of Fig.l 1 denotes a tubular high-pressure accumulator, as is known from the prior art.
• the high-pressure accumulator 1 has a storage tube 2, which surrounds a storage space 3.
• the high-pressure accumulator 1 is provided for an injection system for internal combustion engines and is commonly referred to as a rail.
• a plurality of discharge ports 4 are formed for fuel pressure lines to injectors, not shown. Furthermore, a supply port 7 is formed to a high-pressure pump, not shown, on the storage tube 2.
• receptacles 5 and 6 for attachment components 8 and 9 are formed on the storage tube 2.
• the attachment component 8 is a rail pressure sensor for determining the pressure in the storage space 3.
• the attachment component 9 is a pressure valve, preferably a pressure regulating valve for regulating the pressure in the storage space 3.
• the pressure valve 9 or pressure control valve 9 is designed for example as an electromagnetic valve and has a non-illustrated electrical connection for connection to a control unit or a power supply, not shown.
• the receiving opening 6 for the pressure valve 9 is connected via a drain channel 32 with a low pressure port 34, so that a controlled via the pressure valve 9 amount of fuel can be passed to a low pressure return.
• the drainage channel 32 opens into the receiving opening 6, that when attached to the high pressure accumulator 1 pressure valve 9, a seal between the high pressure part and the low pressure part (drain channel 32) is ensured.
• the pressure valve 9 and the rail pressure sensor 8 are arranged at opposite ends of the high-pressure accumulator 1. The distribution of these add-on components 8, 9 on the high pressure accumulator 1 is basically arbitrary.
• FIG. 2 shows a section of a high-pressure accumulator 1 according to the invention, cut longitudinally in a perspective view.
• the high-pressure accumulator 1 is particularly suitable for a fuel injection system, for example a common rail system. From a high-pressure pump, not shown, fuel under high pressure via the supply port, not shown in the
• Combustion chambers of internal combustion engines is distributed.
• the high-pressure accumulator 1 has the storage tube 2, in which the
• Storage space 3 is formed for storing the fuel under high pressure. Due to the supply of fuel from the high-pressure pump and the discharge of the fuel to the injectors arise
• Honeycomb structure 10 is arranged.
• the embodiment of Figure 2 the embodiment of Figure 2, the
• Honeycomb structure 10 a plurality of axially spaced apart disks 1 1, in each of which in turn a plurality of honeycomb-shaped recesses 12 are formed.
• the disks 1 1 are preferably at a distance a from
• Storage space 3 with a diameter D of about 10 mm advantageously each of the shape of a uniform hexagon with an edge length s of
• Recesses 12 is preferably 0.55 mm.
• Recesses 12 are interconnected.
• the honeycomb Recesses 12 thus represent throttles in the axial flow direction, which effectively attenuate any pressure overshoot on flow. This will set the maximum pressure peaks within the honeycomb Recesses 12
• High-pressure accumulator 1 and also damped within the downstream injectors. Accordingly, the life of these components is increased.
• the storage tube 2 and the honeycomb structure 10 are integrally formed, so that no complex connection technology is required.
• the corresponding manufacturing method is preferably the 3D printing method for this purpose; a conventional casting process is not suitable for such high volume geometries.
• honeycomb structure 10 in a half-model in a perspective view, wherein only the essential areas are shown.
• the honeycomb structure 10 of this embodiment comprises honeycomb cheeks 15, which are lined up axially one after the other and which are shaped in a cup shape with a broad head area 17 and a strongly tapered foot area 16.
• the individual Wabenkelche 15 are strung together so that a foot area 16 always interacts with another foot portion 16 of the next Wabenkelchs 15, and a head portion 17 with the next
• the foot regions 16 or head regions 17 are supported on a corresponding shoulder or end face of the storage tube 2. Due to the positive juxtaposition of the individual Wabenkelche 15, the honeycomb structure 10 in this embodiment, a high rigidity and thus increases the strength of the storage tube 2 and the whole
• High-pressure accumulator 1 both in the radial and in the axial direction.
• the individual Wabenkelche 15 have a length L of 5 mm, wherein advantageously 10 to 15 Wabenkelche 15 are lined up in the storage space 3. Furthermore, the honeycomb-shaped recesses 12 for a storage space 3 with a diameter D of about 10 mm
• honeycomb structure 10 advantageously in each case the shape of a uniform hexagon with an edge length s of 0.75 mm.
• the web width u of the honeycomb structure 10 between the individual recesses 12 is preferably 0.55 mm.
• a very complex geometry of the honeycomb structure 10 can be realized with the 3D printing method, especially if the honeycomb structure 10 is designed in one piece with the storage tube 2.
• the embodiments described above are shown to be particularly effective for damping the pressure oscillations in the storage space 3, caused by the periodic conveyance of fuel under high pressure from the high pressure pump via the

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=58544959

Family Applications (1)

Country Status (7)

Families Citing this family (10)

Family Cites Families (21)

• 2016
  • 2016-05-31 DE DE102016209423.8A patent/DE102016209423A1/de active Pending
• 2017
  • 2017-04-12 CN CN201780034221.2A patent/CN109219698A/zh active Pending
  • 2017-04-12 EP EP17717167.5A patent/EP3464870A1/de not_active Withdrawn
  • 2017-04-12 KR KR1020187034449A patent/KR20190012172A/ko not_active Application Discontinuation
  • 2017-04-12 US US16/305,664 patent/US20200325866A1/en not_active Abandoned
  • 2017-04-12 JP JP2018562348A patent/JP6692931B2/ja not_active Expired - Fee Related
  • 2017-04-12 WO PCT/EP2017/058845 patent/WO2017207156A1/de unknown

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