CN1342841A - Simplified tooth-plane tooth internal rotor for internal gear rotary pump - Google Patents
Simplified tooth-plane tooth internal rotor for internal gear rotary pump Download PDFInfo
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- CN1342841A CN1342841A CN 01118285 CN01118285A CN1342841A CN 1342841 A CN1342841 A CN 1342841A CN 01118285 CN01118285 CN 01118285 CN 01118285 A CN01118285 A CN 01118285A CN 1342841 A CN1342841 A CN 1342841A
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- tooth
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- inner rotor
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- 238000007493 shaping process Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000010779 crude oil Substances 0.000 abstract 1
- 230000010349 pulsation Effects 0.000 abstract 1
- 210000000515 tooth Anatomy 0.000 description 32
- 238000000034 method Methods 0.000 description 7
- 230000004807 localization Effects 0.000 description 4
- 238000004590 computer program Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The second generation internal gear pump changes the driving wheel from the first generation inner rotor to the outer rotor and simplifies the tooth form of the outer rotor. The tooth profile of the inner rotor is the envelope curve of the tooth profile of the outer rotor. This makes it difficult to finish and to measure technically. The invention further simplifies the inner rotor into a plane tooth form (the formed bus is a straight line) and a third generation tooth form. The main contradiction based on the displacement pump is the regular change of the volume, and many working conditions do not require strict limitation of medium hydraulic pulsation, so that the requirement on the rotation stability of the inner rotor is relaxed. Such as crude oil transportation. This is the basis of the idea of the present invention. The result is a prospect for the inner rotor adopting the hard tooth surface technology and reducing the production cost.
Description
The invention belongs to the gear pump field in the displacement pump.
First generation crescent gear pump, profile of tooth are involute or cycloid, internal rotor (external gear) initiatively, the height nip separate by moon-shaped plate.First patent application time is 1911.Five, the sixties institution of higher learning relevant textbook in open lecturing, be not patent already.
The profile of tooth of second generation crescent gear pump is representative with U.S. Viking pump.Characteristics are arc toothed external rotor actives.The profile of tooth of internal rotor is made up of the envelope of circular arc profile.Fine finishing of this profile of tooth (grinding) and commercial measurement be difficulty.Design program is that the external rotor (internal gear) of at first determining circular arc profile is obtained the envelope that is engaged with it again.It has simplified a profile of tooth than the first generation.Improve volumetric efficiency more than 50%.
The present invention surely belongs to the profile of tooth of third generation crescent gear pump, and main feature is that the flank profil of external gear (internal rotor) further is reduced to a plane (the shaping bus is a straight line).Design program is to determine that at first the number of teeth of internal rotor and " pressure angle " (using the involute gear term) utilize this kind profile of tooth characteristic insensitive to dimensional changes, the position of the radius of curvature of circular arc again.By first critical localisation (an internal tooth symmetry claims first critical localisation when being between two external tooths) latch not.Tooth top (or flank) does not take place second critical localisation (an external tooth symmetry is called second critical localisation when being between two internal tooths) interferes, and guarantee the main technologic parameters that three main computer programs such as reasonable back lash (in fact this is the seal clearance of internal leakage) at the bottom of between cog and the tooth and means are determined external rotor (internal gear), as: tool radius, the numerical value of centre distance of center cutter → workpiece centre etc. and indirect measurement parameter.
In a word, compare with second generation profile of tooth, its design philosophy, computer program and method just in time are to reverse to have come.It is equivalent to one group of tooth bar, be distributed on the small circumference, admit in the process that the internal gear of circular arc profile promotes the external gear of plane flank profil it is not that arc surface is done " pure " in the plane and rolled, but subsidiary small slippage, (also there is this phenomenon in the engagement process of its tangible other profiles of tooth, reason is that two gears rotate around the different centers of circle respectively, contact points distance of center circle extremely separately is from difference, as long as make the tangential velocity triangle of this point, just can reach a conclusion) and consequent possible " wearing and tearing " can remedy by hard flank of tooth technology fully.
With regard to the claimant retrieves domestic patent, below several examples all be on " profile of tooth ", to make an issue of in fact.
Publication number: the patent of CN1208818A inventor Hull Man Hale " profile of tooth of internal gear is trapezoidal, and the profile of tooth of small gear is small gear is rolled on internal gear and to determine ".
Publication number: CN2229555Y has " flank profil of small gear is the enveloping outer enclosure of circular arc profile " on the utility model patent of application designer Yan generation English.Very similar to the small gear flank profil curve of U.S. Viking pump.
Publication number: the external rotor of the utility model patent of the interior engagement outward turning line rotor pump of 87200648 application designer field timely rain fences is regular polygon flank profils, and the internal rotor flank profil is its " outward turning string of a musical instrument " (also being envelope).In a word, they all are the mentality of designing that follows second generation crescent gear pump without exception, determine the parameter of external rotor (internal gear) earlier.(two examples are arranged, and the flank profil of external rotor also is the plane that the straight line bus forms) is in the flank profil of trying to achieve internal rotor (external gear) thus by the method for making envelope.The result is the fine finishing to the internal rotor flank profil, and commercial measurement causes difficulty.
4. the objective of the invention is to simplify profile of tooth is that means reach simplification technology, need not special purpose machine tool and cutter, measurer.Only just can produce the inside and outside rotor that the inside engaged gear rotary pump is used,, reduce import, plug a gap to reduce cost with simple and easy method.(inventing with this is the cost of production of the crescent gear pump that produces of theoretical foundation simultaneously to compete the international market with it with low cost, has only 1/8～1/10 of U.S. Viking pump according to measuring and calculating, especially the usefulness when the transfer of highly viscous medium remains to be verified under different operating modes near Expected Results its working life).
5. content of the present invention; Be exactly internal rotor (external gear) the shaping bus used of inside engaged gear rotary pump be straight line.The flank of tooth is a plane.Can not further simplify again.Its processing method is the processing on " plane ", and it is all right to mill, dig, insert, draw, grind (end face mill).The circular arc profile internal gear that is meshed with it then has three tooth difference transmissions respectively.Two lateral tooth flanks of the each inswept different teeth of cutter, centre also will " be jumped " and be crossed a tooth processing.Just each inswept three teeth.(Fig. 2) also have two teeth difference transmission, the different process method of only inswept at every turn two teeth of cutter (Fig. 3) in addition.Decide two important technical parameters of external rotor thus: the computer program of the centre distance of tool radius and cutter → workpiece and formula.
6. the present invention's advantage compared with prior art just is that technology is simple, low-cost, grasp and be easy to obtain the accurately machined hard flank of tooth (improving the life-span) easily.In being applicable to, the small size pump.
7. the claimant thinks that the best way that realizes invention is to set up group company to handle affairs the producing in serial form product by market discipline.At first satisfy domestic demands, reduce import.During conditions being possessed, squeeze into the international market with " low cost " immediately.
Claims (1)
- Technical characteristics: the flank of tooth of this internal rotor is the plane, and the shaping bus is straight line (the external rotor profile of tooth that is engaged with is a circular arc).Claimed scope: 1. pressure angle: 0 ° of-12 ° of definition: the angle of gear-tooth forming bus and gear teeth center line.2. the number of teeth: 4-12 tooth
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011182857A CN1167881C (en) | 2001-05-28 | 2001-05-28 | Internal rotor with simplified planar tooth profile for rotary pump with internally engaged gears |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011182857A CN1167881C (en) | 2001-05-28 | 2001-05-28 | Internal rotor with simplified planar tooth profile for rotary pump with internally engaged gears |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1342841A true CN1342841A (en) | 2002-04-03 |
| CN1167881C CN1167881C (en) | 2004-09-22 |
Family
ID=4663076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011182857A Expired - Fee Related CN1167881C (en) | 2001-05-28 | 2001-05-28 | Internal rotor with simplified planar tooth profile for rotary pump with internally engaged gears |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1167881C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563008A (en) * | 2012-02-02 | 2012-07-11 | 佛山市顺德区中意液压有限公司 | Method for designing tooth profile curve of linear conjugate internal gear pair |
| CN110857689A (en) * | 2018-08-24 | 2020-03-03 | 杭州三花研究院有限公司 | Electric pump |
-
2001
- 2001-05-28 CN CNB011182857A patent/CN1167881C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563008A (en) * | 2012-02-02 | 2012-07-11 | 佛山市顺德区中意液压有限公司 | Method for designing tooth profile curve of linear conjugate internal gear pair |
| CN102563008B (en) * | 2012-02-02 | 2016-06-08 | 佛山市顺德区中意液压有限公司 | Method for designing tooth profile curve of linear conjugate internal gear pair |
| CN110857689A (en) * | 2018-08-24 | 2020-03-03 | 杭州三花研究院有限公司 | Electric pump |
| CN110857689B (en) * | 2018-08-24 | 2021-10-19 | 杭州三花研究院有限公司 | Electric pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1167881C (en) | 2004-09-22 |
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| C14 | Grant of patent or utility model | ||
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| DD01 | Delivery of document by public notice |
Addressee: Chen Yitang Document name: Notification to Pay the Fees |
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| DD01 | Delivery of document by public notice |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040922 Termination date: 20100528 |