CN102654125B - positive displacement fluid pump - Google Patents
positive displacement fluid pump Download PDFInfo
- Publication number
- CN102654125B CN102654125B CN201210116107.3A CN201210116107A CN102654125B CN 102654125 B CN102654125 B CN 102654125B CN 201210116107 A CN201210116107 A CN 201210116107A CN 102654125 B CN102654125 B CN 102654125B
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- China
- Prior art keywords
- gear rotor
- pump housing
- rotor
- inner gear
- pump
- Prior art date
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- Expired - Fee Related
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- 239000012530 fluid Substances 0.000 title claims abstract description 29
- 238000006073 displacement reaction Methods 0.000 title abstract description 5
- 239000004033 plastic Substances 0.000 claims abstract description 30
- 229920003023 plastic Polymers 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 28
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 239000002184 metal Substances 0.000 claims description 23
- 238000005192 partition Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 3
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 3
- 229920001568 phenolic resin Polymers 0.000 claims description 3
- 239000005011 phenolic resin Substances 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims 1
- UQMRAFJOBWOFNS-UHFFFAOYSA-N butyl 2-(2,4-dichlorophenoxy)acetate Chemical compound CCCCOC(=O)COC1=CC=C(Cl)C=C1Cl UQMRAFJOBWOFNS-UHFFFAOYSA-N 0.000 description 13
- 239000007788 liquid Substances 0.000 description 13
- 238000005086 pumping Methods 0.000 description 11
- 239000000376 reactant Substances 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 7
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000004734 Polyphenylene sulfide Substances 0.000 description 4
- 229920000069 polyphenylene sulfide Polymers 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 235000013877 carbamide Nutrition 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920002530 polyetherether ketone Polymers 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 241000269799 Perca fluviatilis Species 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- LCDFWRDNEPDQBV-UHFFFAOYSA-N formaldehyde;phenol;urea Chemical compound O=C.NC(N)=O.OC1=CC=CC=C1 LCDFWRDNEPDQBV-UHFFFAOYSA-N 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- -1 phenolic aldehyde Chemical class 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention relates to positive displacement fluid pump, specifically, a kind of fluid pump includes motor, inner gear rotor and external gear rotor.Inner gear rotor is driven by motor and rotates about the axis, and has multiple outward extending tooth.External gear rotor has multiple teeth extended internally of the indented joint with inner gear rotor so that when inner gear rotor rotates, and external gear rotor is driven to rotate around the second axis.At least one in inner gear rotor and external gear rotor is made up of plastic material.
Description
The reference of copending application
This application claims the rights and interests of the U.S. Provisional Patent Application Serial No. 61/449,013 submitted on March 3rd, 2011, its
Full content is as being incorporated herein by reference.
Technical field
This patent disclosure relates generally to a kind of fluid pump, and relate more specifically to a kind of positive displacement fluid pump.
Background technology
The pump of electric motor drive can be used to pump plurality of liquid.In some applications, it is similar in a motor vehicle, electric notor
The pump driven is used for pumping fuel from fuel tank to combustion engine.In other are applied, pump can be used to pump additive, example
As being used for reducing the additive of nitrogen oxides present in the waste gas from explosive motor particularly Diesel engine.
Summary of the invention
A kind of fluid pump includes motor, inner gear rotor and external gear rotor.Inner gear rotor is driven around axis by motor
Rotate, and there is multiple outward extending tooth.External gear rotor has the multiple of the indented joint with inner gear rotor and extends internally
Tooth so that when inner gear rotor rotates, external gear rotor is driven to rotate around the second axis.Inner gear rotor and external gear
At least one in rotor is made up of plastic material.
The most in some embodiments, fluid pump includes motor, first pump housing, the second pump of neighbouring first pump housing
Body, inner gear rotor, external gear rotor and guide finger.Inner gear rotor be received in described first pump housing and described second pump housing it
Between, described motor it is driven around axis and rotates and there is multiple outward extending tooth.External gear rotor is received in described first
Between the pump housing and described second pump housing, and having multiple tooth extended internally, the plurality of tooth extended internally is by described interior
The indented joint of gear rotor so that when described inner gear rotor rotates, described external gear rotor is driven to revolve around the second axis
Turn.At least one in described inner gear rotor and described external gear rotor is made up of plastic material.Guide finger can be by described
At least one in one pump housing or described second pump housing carries and limits the axis that described inner gear rotor rotates about.When
When described inner gear rotor is made of plastics, described guide finger is made of metal, and when described inner gear rotor is made of metal
Time, described guide finger is included in the lining between described guide finger and described inner gear rotor.
The invention also discloses a kind of method manufacturing pump part.The method includes: be made from a plastic material first pump housing；
It is directed to pin be molded in described first pump housing；Use described guide finger, as the reference for position, chamber, chamber is machined to institute
State in first pump housing.So, external gear rotor obtains relative to described guide finger when being at least partially disposed at described intracavity
It is precisely located.
Accompanying drawing explanation
Below with reference to accompanying drawing, exemplary embodiment and optimal mode are described in detail, in accompanying drawing:
Fig. 1 is the side view of fluid pump；
Fig. 2 is the sectional view of fluid pump in Fig. 1；
Fig. 3 is the exploded view of fluid pump；And
Fig. 4 is the perspective view of the pump of fluid pump, it is shown that its pumping element.
Detailed description of the invention
In detail with reference to accompanying drawing, accompanying drawing 1-3 illustrates fluid pump 10, and it has the volume that can be driven rotation by electric notor 14
Formula pump assembly 12.Pump 10 can be used for pumping the liquid of any appropriate, including and for this specification hereinafter, SCR
(SCR) reactant.SCR system storage liquid or the SCR reactant of solid-state.SCR reactant can include carbamide ((NH2)2CO)
Compositions with water.The example of SCR reactant is ADBLUE, its be by German automobiles TIA have for aqueous urea
The registered trade mark of solution.SCR reactant is transported to waste gas stream and the upstream of one or more catalyst of engine downstream.
Typical SCR system includes that the selectivity release catalyst in gas extraction system, downstream catalyst provide the metering of SCR reactant
Syringe and SCR reactant delivery system.
Fluid pump 10 can include the motor 14 coupling to drive pump assembly with pump assembly 12.In the embodiment of display,
Motor 14 drives pump assembly 12 by magnetic coupling.So if desired, then motor 14 can by partition wall 16 from pump group
Part 12 is separately so that motor is held apart at the fluid being pumped.If desired, then motor 14 and pump assembly 12 can be by
Main shell 18 is physically connected together.Main shell 18 comprises the steps that the tubular shell 20 can being made up of metal or plastics；Can close
The motor cover 22 (being also plastics or metal) of the end of the neighbouring motor of shell 20；With can be with the neighbouring pump assembly 12 of closed housing 20
At least one of pump cover 24 (being also metal or plastics) of end.Motor cover 22 can include opening 26, and line is by this opening 26
To provide power to motor 14.Pump cover 24 can include import 28 and outlet 30, and liquid SCR reactant is taken out in case by import 28
Getting in pump, the liquid SCR reactant after pressurization is discharged from pump by outlet 30.Shell 20 can be curled, rolls or enclose
Around or be suitable to keep other modes of motor cover 22 and pump cover 24 to be formed.Shell 20 can include or be provided with internal stop, example
Such as groove, rib 32, or be suitable to be engaged by motor 14 or be positioned at by motor 14 other features of given position in shell 20.
Motor sub-assembly can include motor 14 and the output shaft 34 rotating together with motor 14 or being rotated by motor 14.Motor
14 can be the structure of any appropriate, such as, include but without limitation for having brush or brushless DC motor.Such as, motor 14 can
To provide the moment of torsion of about 30m-Nm under 13V and 1.6A when about 4500RPM, and can be electric from Hong Kong Johnson
The HC series horse that industry Manufacturing Co., Ltd (Johnson Electric Industrial Manufactory Ltd.) obtains
Reach.Another kind of motor is the kpattern number BLDC36 provided by Japan Minebea Co.Ltd..Motor 14 can have inside it
The casing 36 of parts, and motor chassis 36 can be closely received in shell 20.Output shaft 34 can have driving feature or
It is otherwise coupled to drive member 38.Drive feature or coupling can include positioning screw (not shown), spline connection
Part, supporting non-circular driving feature (platform on such as axle 34 and in lining 39), of course, it is possible to make otherwise.
Shell 40 that drive member 38 includes being connected to output shaft 34 and one or more magnetic field generation section part, such as by outward
Magnet 42 that shell 40 supports, that arrange circumferentially around axle 34.Shell 40 can be by any suitable material system including multiple plastics
Become.Owing to shell 40 in the present embodiment is not exposed to the liquid that is pumped, therefore shell 40 need not by impermeable liquid
Or otherwise contact the compatible material of application to make with liquid.Shell 40 can pass through such as press-fit or packing ring and folder
Tool is such as connected to the spring perch of output shaft 34 and keeps or be supported on output shaft 34.As indicated, shell 40 can include
Receive one or more potholes 44 of magnet 42.Pothole 44 can such as be sealed by shell 40 Overmolded on magnet 42 completely
Fill magnet 42, or pothole 44 can opened in one side so that: when magnet is arranged in pothole 44, the one side edge of magnet 42
The one side of shell exposes.In this arrangement, the face of shell 40 can be arranged by neighbouring partition wall 16.Generally, magnet 42 provides
On partition wall and through partition wall magnetic field.
Certainly, multiple (magnets) 42 can be set to any shape desired, structure and arrangement, includes, but are not limited to ring
Shape magnet, square position magnet or around the spaced apart multiple magnetic sections of axle 34 or sheet.Drive member 38 can be by by by rustless steel
Shell supports or one or more rare-earth magnets of Overmolded phenolic aldehyde or polyphenylene sulfide (PPS) resin construct and composition.Magnetic
Body 42 such as can be formed (Nd by neodymium, ferrum and boron2Fe14B).In another example, drive member 38 can be from MA Oxord's
Obtain to Magnetic Technologies, Ltd business.Example coupling is MTD-0.2ASSY, and it has the slip of 0.2Nm
Moment of torsion, and it is configured with aluminum shell 40 and six magnets 42.When providing electric power to motor 14, shell 40 and magnet 42 are with output shaft
34 rotate.
Pump assembly 12 can include pump case 50, be arranged in shell 50 driven member 52 and be couple to driven member 52 and
The pumping element 54 driven by driven member 52.Driven member 52 comprises the steps that shell 56；With the magnetic field in response to drive member 38
Component, the most one or more magnets 58, or can (many by the field drives provided from the magnet 42 of drive member 38
Individual) other components.Shell 56 can be substantially similar to drive member shell 40 and construct, and magnet 58 can be identical similarly
Structure and (multiple) material.Driven member shell 56 can include one or more finger piece 60, and it is adapted for couple to pumping element
54 thus couple driven member 52 with pumping member 54 in case together with rotate.Shell 56 may also include central passage 62, guide finger
78 or the part of bearing may be received in this central passage 62.Additionally, due to shell 56 can be exposed to pumped liquid, because of
It can be formed by the material different from drive member shell 40 when needed, in particular by being suitable in pumped liquid for this
The material used is formed.Be it desired to or need in a particular application, then during magnet 58 can also be sealed in shell 56 and with
Fluid isolation.
As in Figure 2-4, pumping element 54 can be the positive displacement pump including pair of engaged gears, sometimes referred to as internal gear
Pump or gear rotary pump.In an illustrated embodiment, pumping element 54 includes: external gear rotor 64, and it can be to have
Extend internally the annular ring gear of tooth 66；And inner gear rotor 68, its have that the tooth 66 with outer ring gear engages to extension
Stretch tooth 70.External gear rotor 64 and inner gear rotor 68 are arranged between first pump housing 72 and second pump housing 74.
First pump housing 72 can include blind hole 76, blind hole 76 receives axle or guide finger 78 with driven member shell 56
Contrary end.In the embodiment of display, first pump housing 72 is located between pump cover 24 and second pump housing 74.First pump housing 72 is also
Can include chamber 80, (certainly, chamber can also be formed in second pump housing, or partly to be provided with external gear rotor 64 in chamber 80
Formed by first pump housing and second pump housing).Chamber 80 can have the axis of axis 82 deviation with guide finger 78 so that external tooth
The rotation axis of wheel rotor 64 deviates with the rotation axis of inner gear rotor 68.Inlet hole 84 axially prolongs along first pump housing 72
Stretch, so that the fluid being in inlet pressure enters the expanding chamber between gear rotor 64,68.Inlet ports 84 is directed at pump cover 24
In intake channel 28, and when wishing, filter or sieve 85 can arrange in passage one or two in or
Between them, to filter the impurity from pumped liquid.Similarly, outlet port 86 is directed at the outlet 30 of pump cover 24, to permit
Permitted fluid from it by excavationg pump assembly 12.
Second pump housing 74 may be received between first pump housing 72 and the flange of shell 20 or shoulder 88.Second pump housing 74 is permissible
Against gear rotor 64,68, and the generally flat surface of adjacent rotor can be included, to seal pump chamber, and keep fluids in
Until fluid moves to export 86 in pump chamber, thereby fluid can be discharged from pump assembly 12 under stress.Second pump housing 74 can include
Opening 90, a part for driven member shell 56 extends through opening 90, to allow driven member 52 and inner gear rotor 68
It is connected together.
Driven member 52, the pump housing 72,74 and pump cover 24 can be linked together by pump case 50.Pump case 50 can be to have
The substantially cup type of blind end, blind end defines sidewall 94, all or part of partition wall 16.Sidewall 94 also can roll and enclose
Around or be otherwise fixedly secured to pump cover 24, and crimp on the shoulder of second pump housing 74 with by the pump housing 72,74 and pump cover
24 are held tightly together.Gap can be provided with, to allow driven member 52 relative between pump case 50 and driven member 52
Pump case 50 is freely rotatable.Pump case 50 can include chamber or protuberance 96, wherein receivability thrust disc 98.Thrust disc 98 is permissible
Engaged by the thrust pin 100 carried by driven member shell 56, to provide the stayed surface rotated for driven member 52, and
And tend to moving driven member 52 to the power of the magnet 42,58 of partition wall 16 with opposing and by driven member 52 from pump case 50 points
Open.In the case of the parts being coupled together by pump case 50, pump assembly 12 can be discrete module units so that
In assembling with the motor 14 in shell 20.
Inner gear rotor 68 is via the finger that may be received in the slit or opening 102 (Fig. 4) formed in inner gear rotor 68
Shape thing 60 can be couple to driven member 52 rotatably, and with around the axis identical with driven member 52, described axis is permissible
Consistent with the axis 82 of guide finger 78.Inner gear rotor 68 can be made up of metal or plastic material.Depend on the liquid of pumping,
Different plastics can be used, including thermosetting plastic (such as bakelite) and thermoplastic (such as PEEK or PPS).Material can
Account for lubricant such as polytetrafluoroethylene (Teflon) or the graphite of about 15% amount having weight, and weight accounts for the reinforcement of about 30% amount
Material such as carbon, and material can have more than 20, the bending modulus of 000MPa.In a current preferred mode, phenol
Urea formaldehyde is used for manufacturing inner gear rotor, and has lubricant and the carbon of 30% weight of 15% weight.When being made of plastics
Time, inner gear rotor can be molded as its net shape, or, it can be molded and then be machined to its final size and shape
Shape.When corrosion-resistant important time, it is possible to use plastics or corrosion resistant metal, such as rustless steel.Rustless steel inner gear rotor can be
Wear away on metal guide finger 78.Lining can be used on guide finger 78 to suppress or prevent abrasion from occurring.Lining can also
Use between plastic annular wheel rotor and metal guide finger, but be not likely to be required.Guide finger 78 can by austenitic steel or
Person's other materials such as hardness tungsten carbide more than 60 under Rockwell C yardstick.
External gear rotor 64 can be able to be rotatably driven to rotate about the axis thereof external gear rotor by inner gear rotor 68, should
Axis deviates, as described above with the rotation axis of inner gear rotor.External gear rotor 64 can be by metal or plastic material system
Become.Different plastics can be used, including thermosetting plastic (such as phenolic resin) and thermoplastic (such as PEEK or PPS),
About as described in inner gear rotor.When made of plastic, external gear rotor can be molded as its net shape, or, it can
It is molded and is then machined to its final size and shape.When corrosion-resistant important time, it is possible to use plastics or corrosion resistant metal,
Such as rustless steel.In a current preferred mode, external gear rotor is by the rustless steel manufacture that can be sintering.Metal is excellent
Elect as and there is hardness under 0.03% to 0.1% carbon, density at least 6.8g/cc and Rockwell B yardstick more than 60 preferably more than 70
Austenitic stainless steel.One example of this metal is Stainless steel 316 N1, and it also has relatively low elongation percentage, and this can improve
The ability of the gear rotor of tight manufacturing tolerance is formed in the case of small deformation.If/when it is made of metal, for internal tooth round
Son can use identical material.In at least some current preferred mode, gear rotor 64,68 comprises the steps that 1) plastics
Inner gear rotor and plastics external gear rotor；2) plastic annular wheel rotor and metal external gear rotor；With 3) metal internal teeth round
Son and plastics external gear rotor.These combinations of gear rotor 64,68 are formed as durable and provide corrosion-resistant.
At least some corrosion resistant metal that can use with the fluid more corroded, such as some rustless steel, is likely not to have foot
Enough hard to meeting some durable standard (they may wear away on guide finger or between self).Therefore, in some applications,
The inner gear rotor made by corrosion resistant metal and the use of external gear rotor may be unsatisfactory.Implement at least some
In mode, at least when external gear rotor 64 is made of metal, first pump housing 72 can be made up of plastic material, or has use
The chamber 80 of plastic material lining.When external gear 64 is made up of plastic material, first pump housing 72 can be made up of suitable metal,
Or there is the chamber using suitable metal lining.
In forming an embodiment of method of pump assembly 12, guide finger 78 can embed molding (insert
Molded) to first pump housing 72.Then, utilizing guide finger 78 as reference or localizer, chamber 80 is machinable to the first pump
In body 72.So, the change of guide finger 78 position is considered to guarantee that (it is the rotation of inner gear rotor to the axis 82 of guide finger 78
Shaft axis) and the axis (it is the rotation axis of external gear rotor) in chamber 80 between expectation deviation.And inner gear rotor 68
With the hope relation between external gear rotor 64 can run through the production process of pump and realize.Certainly, combination die can use, wherein
One chamber is formed as receiving guide finger 78, and the second chamber is formed as receiving external gear rotor 64.But, at least some of embodiment party
In formula, as a reference point with the axis utilizing other chamber machine chamber compared with, the position of the cavity axis in multi-cavity mold and
More evolutions can be had between guide finger.
In a kind of exemplary method forming gear rotor, inner gear rotor 68 can be moulded by plastic material, and external gear
Rotor 64 can be the stainless steel material of sintering.Then inner gear rotor 68 can be molded as its net shape, or molding also machine
Process to improve the desired size or shape mated with external gear 64, as desired.In one embodiment, inner gear rotor
Gap between the tip of tooth 70 and external gear rotor tooth 66 is positively retained between about 10 to 30 microns.Inner gear rotor and external tooth
The profile of wheel rotor can keep with the tolerance of 0.030mm or less.
During operation, motor 14 is encouraged by electrical power with rotating output shaft 34 and the drive member 38 that couples with axle 34.Cause
For the magnetic attraction between them, so the rotation of drive member 38 causes driven member 52 about guide finger 78 and at pump case
Rotate in 50.Due to the mechanical connection between them, so the rotation of driven member 52 causes the rotation of inner gear rotor 68, its
External gear rotor 64 is rotated via intermeshing tooth 66,70.Therefore, the operating of motor 14 cause pump assembly 12 by arrange
The operating of wall 16 between which.Even if pump freezes or immovable, such as, when SCR reactant freezes wherein, magnetic
Coupling can allow motor 14 to rotate.Pumping installations 10 can have the ability of any appropriate output, such as and without limitation about 2 arrives
8bar or more lower be about 20 to 60 ls/h.(such as, pumping installations 10 can be carried by case in any suitable way
On case or interior), or discrete with case and away from.Transported by the wall 16 being arranged between motor 14 and pump assembly 12 at pump 10
During row, motor 14 can be with pumped liquid isolation.
Pump 10 runs the partition wall 16 that strides across or pass through, can by nonmagnetic substance or be not very magnetic susceptibility but allow
The material that magnetic field extends there through is made.Such as, pump 10 runs and strides across or the wall that passes through can be by the polymeric material of any appropriate
Material, such as polyamide or NYLON 6/6 are formed, or by metal, the most nonmagnetic or complete magnetic is transparent
Rustless steel is formed, such as, and austenite or containing nickel and stainless steel.In at least some embodiment, (it can be case to partition wall 16
A whole thickness part for wall, as discussed previously) is up to 5mm, and in some embodiments, and the whole thickness of partition wall
Can be between about 2mm to 4mm.
Description above is the preferred embodiment of fluid pump；What invention discussed here was not limited to illustrate is embodied as
Example.Various changes and correction will be apparent to those of ordinary skill in the art, and all these change and correction be intended to by with
In attached the scope and spirit of the present invention and defined in the claim.As non-limitative example, motor can directly mechanically couple
To inner gear rotor without magnetic coupling.In this case, can be sealed by penetrating of partition wall, or at least some of enforcement
In mode, may not need partition wall.
Claims (8)
1. a fluid pump, including:
Motor；
First pump housing；
Second pump housing of neighbouring described first pump housing；
Being received in the inner gear rotor between described first pump housing and described second pump housing, it is driven around axis by described motor
Rotate and there is multiple outward extending tooth；
Being received in the external gear rotor between described first pump housing and described second pump housing, it has multiple tooth extended internally,
The plurality of tooth extended internally is by the indented joint of described inner gear rotor so that when described inner gear rotor rotates, described
External gear rotor is driven to rotate around the second axis, and wherein said inner gear rotor is made up of plastic material, and wherein said
External gear rotor is made up of the austenitic stainless steel sintering, its carbon containing 0.03% to 0.1%, the density of at least 6.8g/cc and
The hardness of 60 it is more than under Rockwell B yardstick；And
Guide finger, it is carried and limits described internal gear by least one in described first pump housing or described second pump housing
The axis that rotor rotates about, described guide finger is made of metal.
2. fluid pump as claimed in claim 1, it is characterised in that its also include by described motor from described inner gear rotor and
The separate partition wall of described external gear rotor, and described motor is connected to described inner gear rotor to rotate described internal gear
The magnetic coupling of rotor.
3. fluid pump as claimed in claim 1, it is characterised in that described inner gear rotor is made up of phenolic resin.
4. fluid pump as claimed in claim 1, it is characterised in that chamber is limited in described first pump housing and described second pump housing
At least one in, and wherein said external gear rotor is received in described chamber, and described chamber includes neighbouring described external tooth
The plastic material of wheel rotor.
5. fluid pump as claimed in claim 1, it is characterised in that the tooth of described inner gear rotor and described external gear rotor
Gap between the tip of tooth is between 10 and 30 microns.
6. the method making fluid pump part, including:
It is made from a plastic material first pump housing；
The guide finger with axis is molded in described first pump housing；
Described guide finger is used to be machined in described first pump housing in chamber as the reference of the axial location for chamber so that outer
The rotation axis of gear rotor deviates the axis of described guide finger and accurately determines when being at least partially disposed at described intracavity
, wherein said external gear rotor is made up of the austenitic stainless steel sintering, its carbon containing 0.03% to 0.1%, at least 6.8g/
The hardness of 60 it is more than under the density of cc and Rockwell B yardstick；
Described method also includes being moulded inner gear rotor by plastic material, and it has the tooth be suitable to in described external gear rotor and nibbles
The tooth closed, wherein guide finger limits the axis that described inner gear rotor rotates.
7. method as claimed in claim 6, it is characterised in that it also includes machining described inner gear rotor so that at internal tooth
Gap between the tip of the tooth of wheel rotor and the tooth of external gear rotor is between 10 and 30 microns.
8. method as claimed in claim 7, it is characterised in that described inner gear rotor is made up of phenolic resin.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201161449013P | 2011-03-03 | 2011-03-03 | |
| US61/449013 | 2011-03-03 | ||
| US13/405,480 US8840385B2 (en) | 2011-03-03 | 2012-02-27 | Positive displacement fluid pump |
| US13/405480 | 2012-02-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102654125A CN102654125A (en) | 2012-09-05 |
| CN102654125B true CN102654125B (en) | 2016-11-30 |
Family
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1369588A1 (en) * | 2002-06-04 | 2003-12-10 | Siemens Aktiengesellschaft | Gerotor pump |
| DE102006037177A1 (en) * | 2006-08-09 | 2008-02-14 | Robert Bosch Gmbh | Internal gear pump |
| CN101900019A (en) * | 2008-10-31 | 2010-12-01 | Ti集团自动推进系统有限责任公司 | Reactant delivery for engine exhaust gas treatment |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1369588A1 (en) * | 2002-06-04 | 2003-12-10 | Siemens Aktiengesellschaft | Gerotor pump |
| CN1488859A (en) * | 2002-06-04 | 2004-04-14 | G-rotor pump | |
| DE102006037177A1 (en) * | 2006-08-09 | 2008-02-14 | Robert Bosch Gmbh | Internal gear pump |
| CN101900019A (en) * | 2008-10-31 | 2010-12-01 | Ti集团自动推进系统有限责任公司 | Reactant delivery for engine exhaust gas treatment |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161130 |