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
  • F02M37/02—Feeding by means of suction apparatus, e.g. by air flow through carburettors
  • F02M37/025—Feeding by means of a liquid fuel-driven jet pump
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
  • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
  • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
  • F04F5/46—Arrangements of nozzles
• • 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

Definitions

• the invention is based on a suction jet pump for liquids critical to evaporation, in particular carbon material, according to the preamble of claim 1.
• Such a suction jet pump is known from DE 35 00 718 AI.
• This suction jet pump is used to convey fuel from a storage tank of a motor vehicle into a container from which an aggregate sucks, which conveys fuel to the internal combustion engine of the motor vehicle.
• the suction jet pump has a nozzle connected to a fuel line and a mixing tube arranged after it. Between the nozzle and the mixing tube there is an opening through which the fuel emerging from the nozzle carries further fuel from the storage tank into the mixing tube and thus into the container.
• the fuel line, to which the nozzle is connected is a return line, through which excess fuel delivered by the delivery unit is returned from the internal combustion engine to the storage tank.
• the force flowing through the return line Material is often strongly heated, so that it outgasses at the suction jet pump and steam bubbles occur which impair the operation of the suction jet pump, so that it does not deliver enough fuel into the container.
• the suction jet pump according to the invention with the features according to claim 1 has the advantage that gas bubbles formed on the suction jet pump can escape through the at least one opening on the mixing tube and thus the operation of the suction jet pump is ensured even when the fuel is heated.
• FIG. 1 shows a detail of a fuel storage tank with a suction jet pump arranged in it
• FIG. 2 shows a detail of a longitudinal section through the suction jet pump according to a first embodiment in an enlarged view
• FIG. 3 shows a detail of the suction jet pump of FIG. 2 in the direction of the arrow III
• FIG. 4 a section of a longitudinal section through the suction jet pump according to a second exemplary embodiment
• FIG. 5 a section of a view of the suction jet pump from FIG. 4 in the direction of arrow V in FIG. 4
• FIG. 6 a section of a view of the suction jet pump according to a third embodiment. Description of the embodiments
• FIG. 1 shows a fuel storage tank 10 of a motor vehicle, in which a container 12 is arranged near the bottom 11 thereof. From the container 12, an aggregate 14 sucks in, which conveys fuel, which is known to be an evaporation-critical liquid, to the internal combustion engine 16 of the motor vehicle. The delivery unit 14 delivers more fuel than the internal combustion engine 16 consumes, and the excess fuel returns to the storage tank 10 via a return line 18.
• a suction jet pump 20 arranged near the bottom 11 of the storage tank 10 is connected to the return line 18.
• the suction jet pump 20 has a nozzle 22 connected to the return line 18, which is designed as a Venturi tube and has a mouth section 23 with a mouth cross section that is reduced compared to the clear cross section of the return line 18.
• a mixing tube 26 At an axial distance from the nozzle 22 is a mixing tube 26, the clear cross section of which is larger than the mouth cross section of the nozzle 22. Due to the axial distance between the nozzle 22 and the mixing tube 26, an opening 27 is present between these two parts. for example in the form of an annular gap through which fuel can get from the storage tank 10 into the mixing tube 26.
• the nozzle 22 is arranged outside the container 12 in the storage tank 10 and the mixing tube 26 projects with its end region 28 facing away from the nozzle 22 through a side wall 13 into the container 12.
• a check valve (not shown) can be assigned to the mixing tube 26 within the container 12, which prevents fuel from flowing out of the container 12 through the mixing tube 26.
• the unit 14 delivers fuel from the container 12 to the internal combustion engine 16.
• the amount of fuel not used by the internal combustion engine 16 reaches the storage tank 10 via the return line 18.
• the fuel flowing through the return line 18 and under the delivery pressure generated by the delivery unit 14 flows out through the mouth section 23 of the nozzle 22 and in the process pulls fuel from the storage tank 10 through the opening 27 into the mixing pipe 26.
• the suction jet pump 20 also conveys fuel from the storage tank 10 into the container 12, in which there is thus always a sufficient amount of fuel for the operation of the internal combustion engine 16.
• the suction jet pump 20 can also be used in a jagged storage tank 10, in which the container 12 is arranged in an area of the storage tank 10 which is separated from other areas of the storage tank by bumps or other elevations, so that no fuel from these areas can flow into the area with the container 12.
• the suction jet pump 20 delivers fuel from the other areas of the storage tank 10 into the area in which the container 12 is arranged.
• FIGS. 2 and 3 show the suction jet pump 20 according to a first exemplary embodiment.
• FIG. 2 shows a section of the nozzle 22 with its mouth section 23 and the mixing tube 26 penetrating the wall 13 of the container 12.
• the mixing tube 26 has an opening in the form of a slot 30 in its end region 28 facing away from the nozzle 22 and arranged in the container 12 at its upper peripheral region in the installed position.
• the slot 30 runs approximately parallel to its longitudinal axis 29.
• the width of the slot 30 can be approximately constant over its length or can vary over its length. The fuel flowing back through the return line 18 from the internal combustion engine 16 into the storage tank 10 may be greatly increased. -
• FIGS. 4 and 5 show the suction jet pump 120 according to a second exemplary embodiment, in which only the mixing tube 126 is modified compared to the first exemplary embodiment, but the remaining parts of the suction jet pump 120 are unchanged.
• the end of the mixing tube 126 facing away from the nozzle 22 projects through the wall 13 into the container 12.
• the mixing tube 126 In its end region 128 arranged in the container 12, the mixing tube 126 has an opening 130 at its upper peripheral region in the installed position, which opening is formed by the end region 128 being provided with a bevel 132.
• the bevel 132 extends towards the end of the mixing tube 126 towards the longitudinal axis 129 of the mixing tube 126. This arrangement of the bevel 132 increases the
• FIG. 6 shows a third embodiment of the suction jet pump 220, in which the mixing tube 226 in its end region 228 has a plurality of openings 230 on its circumference, which are arranged distributed over the circumference of the mixing tube 226 and / or in the direction of the longitudinal axis 229 of the Mixing tube 226 are arranged offset to one another.
• the cross-sectional shapes of the openings 230 can be any.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Jet Pumps And Other Pumps (AREA)
• Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7753712

Family Applications (1)

Country Status (7)

Families Citing this family (5)

Citations (8)

Family Cites Families (1)

• 1995
  • 1995-02-11 DE DE19504565A patent/DE19504565A1/de not_active Withdrawn
• 1996
  • 1996-01-11 EP EP96900505A patent/EP0772745B1/de not_active Expired - Lifetime
  • 1996-01-11 DE DE59601703T patent/DE59601703D1/de not_active Expired - Fee Related
  • 1996-01-11 BR BR9605303A patent/BR9605303A/pt not_active IP Right Cessation
  • 1996-01-11 KR KR1019960705184A patent/KR970701834A/ko not_active Application Discontinuation
  • 1996-01-11 CN CN96190003A patent/CN1077248C/zh not_active Expired - Fee Related
  • 1996-01-11 JP JP8523875A patent/JPH09512324A/ja active Pending
  • 1996-01-11 WO PCT/DE1996/000029 patent/WO1996024773A1/de active IP Right Grant

Patent Citations (8)

Non-Patent Citations (1)

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