CN106122005A - A kind of three screw rods using circular arc modified tooth profile - Google Patents
A kind of three screw rods using circular arc modified tooth profile Download PDFInfo
- Publication number
- CN106122005A CN106122005A CN201610708585.1A CN201610708585A CN106122005A CN 106122005 A CN106122005 A CN 106122005A CN 201610708585 A CN201610708585 A CN 201610708585A CN 106122005 A CN106122005 A CN 106122005A
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- Prior art keywords
- screw
- tooth
- driven
- screw rod
- profile
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/082—Details specially related to intermeshing engagement type machines or pumps
- F04C2/084—Toothed wheels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
- F04C2/165—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type having more than two rotary pistons with parallel axes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
Abstract
The invention discloses a kind of three screw rods using circular arc modified tooth profile, including two double end driven screw and a double end actively screw rod, actively screw rod is positioned at centre, and driven screw is arranged symmetrically with along actively screw rod circumference.Driven screw profile of tooth is made up of transition arc, prolate epicycloid, root circle and outside circle, and actively tooth shape of screw is made up of arc envelope line, outside circle and root circle.Transition arc radius scope of design in driven screw profile of tooth is ro/djRatio takes 0.015 ~ 0.025.Three screw rods using circular arc modified tooth profile more smooth out in engagement process, significantly improve the wearability of driven screw, make the operating lifetime about 30 ~ 40% of screw pair, and keep stable volumetric efficiency.It addition, when processing actively screw rod with circular peripheral-mill or emery wheel, tool bit life about 50%, and reduce difficulty of processing.
Description
Technical field
The invention belongs to screw pump technology field, relate to the correction of a kind of three tooth shape of screw, more specifically, it relates to one
Plant three screw rods using circular arc modified tooth profile.
Background technology
The most common three screw pump, its driven screw contrate tooth profile includes root circle, prolate epicycloid, radially
Straight line and outside circle, actively screw rod contrate tooth profile includes root circle, epicycloid, curtate epicycloid and outside circle.Due to driven spiral shell
In bar profile of tooth there is wedge angle in radial alignment and outside circle joint, and therefore, in running, driven screw is easier to when rotating send out
Raw abrasion, makes screw pump ullage in the course of the work increase, and volumetric efficiency declines.On the other hand, use circular peripheral-mill or
During abrasive grinding wheel processing screw rod, not only there is wedge angle in milling cutter or emery wheel contour line, easily wear and tear, make decreased tool life, and
And the established angle of cutter is severely limited, difficulty of processing is made to increase.
Summary of the invention
Present invention is primarily targeted at for the problems referred to above, it is provided that a kind of three screw rods using circular arc modified tooth profile.
A kind of three screw rods using circular arc modified tooth profile, including two double end driven screw 2 and a double end actively screw rod
1, actively the rotation direction of screw rod 1 and two driven screw 2 is contrary, and the screw pair of composition parallel axes external toothing forms conjugation and closes
System.Every end surface profile of tooth of described driven screw 2 is identical, every end surface profile of tooth by First Transition circular arc ab, prolate epicycloid bc,
Driven root circle cd, prolate epicycloid de, the second transition arc ef and driven tooth tip circle fg totally six line smoothings connect composition；
Every end surface profile of tooth of described active screw rod 1 is identical, and every end surface profile of tooth is by the first arc envelope line a b, driving tooth tip circle c
D, the second arc envelope line e f and actively root circle f g totally four curve compositions, the wherein b end of arc envelope line a b
Coinciding together with the c end of outside circle c d, the d end of outside circle c d overlaps one with the e end of point circular arc envelope e f
Rising, arc envelope line and root circle junction are for being smoothly connected.
The technical scheme limited further is as follows:
In the profile of tooth of described active screw rod 1, the conjugate curves of the first arc envelope line a b and the First Transition on driven screw 2
Circular arc ab correspondence engages, and some b is the prolate epicycloid bc on driven screw 2 with the conjugate curves of some c, driving tooth tip circle c d
Conjugate curves corresponding with the driven root circle cd on driven screw 2 engagement, some d with some e conjugate curves be driven screw 2
Upper prolate epicycloid de, the conjugate curves of the second arc envelope line e f are corresponding with the second transition arc ef on driven screw 2
Engagement, actively the conjugate curves of root circle f g are the driven tooth tip circle fg of driven screw 2.
The transition arc radius r of the excessive circular arc ab and second of first in the profile of tooth of described driven screw 2 excessively circular arc efo
Span and pitch diameter djRelevant, its scope is ro/dj=0.015~0.025。
In described screw rod contrate tooth profile, the root diameter d of driven screw 2fWith tip diameter djRatio be 1:3；Actively
The root diameter d of screw rod 1jWith tip diameter daRatio be 3:5, the tip diameter d of driven screw 2jWith active screw rod 1
Root diameter djEqual, and equal to pitch diameter dj, described driven screw 2 is equal with the helical pitch of actively screw rod 1.
The effective technology effect of the present invention is embodied in following aspect:
(1) present invention improves the wearability of driven screw.Owing to there is not wedge angle in driven screw contrate tooth profile, wearability shows
Write and improve, make the operating lifetime about 30 ~ 40% of whole screw pair.For screw pump, will not cause because of screw rod abrasion
Ullage significantly increases, it is ensured that pump maintains stable volumetric efficiency in whole working life.
(2) in active screw rod contrate tooth profile, between arc envelope line and root circle, there is rounding off.First this eliminate
Actively the wedge angle in screw rod circular peripheral-mill or abrasive grinding wheel contour line, makes the wearability of milling cutter or emery wheel significantly improve, uses
Life about 50%.It addition, the established angle that the existence of this rounding off makes actively screw rod circular peripheral-mill or abrasive grinding wheel can
Change within the specific limits, reduce difficulty of processing, make more convenient to operate.
Accompanying drawing explanation
Fig. 1 is the engagement schematic diagram of the driving and driven screw rod of the present invention；
Fig. 2 is the contrate tooth profile schematic diagram of driven screw of the present invention；
Fig. 3 is the contrate tooth profile schematic diagram of the present invention actively screw rod；
Fig. 4 is roRespectively equal to 0.015dj、0.020djAnd 0.025djTime driven screw transition arc local contrast schematic diagram；
Fig. 5 is roRespectively equal to 0.015dj、0.020djAnd 0.025djTime actively screw rod arc envelope line local contrast schematic diagram；
Fig. 6 is driven screw transition arc of the present invention and dynamic schematic diagram when actively screw rod engages；
Fig. 7 is the engagement schematic diagram of original driving and driven screw rod；
Fig. 8 is the contrate tooth profile schematic diagram of original driven screw；
Fig. 9 is the contrate tooth profile schematic diagram of original active screw rod.
Sequence number in above-mentioned figure: actively screw rod 1, driven screw 2, original active screw rod 3, original driven screw 4.
Detailed description of the invention
Below in conjunction with the accompanying drawings, by embodiment, the present invention is further described.
Embodiment
Seeing Fig. 7, Fig. 8 and Fig. 9, original three screw pump profile of tooth uses radial alignment correction three tooth shape of screw, former
Every screw rod contrate tooth profile of some driven screw 4 is identical, and wherein one by radial alignment a1b1, prolate epicycloid b1c1, tooth root
Circle c1d1, prolate epicycloid d1e1, radial alignment e1f1With outside circle f1g1Composition；Every screw rod end face of original active screw rod 3
Profile of tooth is identical, and wherein one by epicycloid a1ˊb1, curtate epicycloid b1ˊc1, outside circle c1ˊd1, curtate epicycloid d1ˊe1ˊ、
Epicycloid e1ˊf1With root circle f1ˊg1Composition.Due to radial alignment a in original driven screw 4 profile of tooth1b1And e1f1Two ends
There is wedge angle, with original active screw rod 3 operating engage time easily wear and tear, cause leakage increase, cause three screw pump to hold
Long-pending efficiency is gradually lowered, unstable properties.On the other hand, when using circular peripheral-mill or emery wheel to process original active screw rod 3, milling
Cutter or emery wheel contour curve also can also exist wedge angle, make decreased tool life, and the established angle of cutter is severely restricted,
Difficulty of processing is made to strengthen.
Seeing Fig. 1, Fig. 2, Fig. 3, a kind of three screw rods using circular arc modified tooth profile, including two double end driven screw 2 Hes
A piece double end actively screw rod 1.Every end surface profile of tooth of described driven screw 2 is identical, and every end surface profile of tooth is by First Transition circular arc
Ab, prolate epicycloid bc, driven root circle cd, prolate epicycloid de, the second transition arc ef and driven tooth tip circle fg totally six
Line smoothing connects composition；Every end surface profile of tooth of described active screw rod 1 is identical, and every end surface profile of tooth is by the first arc envelope line
A b, driving tooth tip circle c d, the second arc envelope line e f and active root circle f g totally four curves compositions, wherein circular arc
The b end of envelope a b coincides together with the c end of outside circle c d, the d end of outside circle c d and point circular arc envelope e
The e end of f coincides together, and arc envelope line and root circle junction are for being smoothly connected.Described active screw rod 1 is positioned at centre,
Driven screw 2 is arranged symmetrically with along active screw rod 1 circumference, and actively the rotation direction of screw rod 1 and driven screw 2 is contrary, forms parallel
The screw pair of axle external toothing, a dextrorotation, another is left-handed, forms conjugate relation.
In the profile of tooth of described active screw rod 1, the conjugate curves of the first arc envelope line a b and first on driven screw 2
Transition arc ab correspondence engages, and some b is the prolate epicycloid bc on driven screw 2 with the conjugate curves of some c, driving tooth tip circle
The engagement corresponding with the driven root circle cd on driven screw 2 of the conjugate curves of c d, some d is driven with the conjugate curves of some e
Prolate epicycloid de on screw rod 2, the conjugate curves of the second arc envelope line e f and the second transition arc ef on driven screw 2
Corresponding engagement, actively the conjugate curves of root circle f g are the driven tooth tip circle fg of driven screw 2.
The transition arc radius r of the excessive circular arc ab and second of first in the profile of tooth of described driven screw 2 excessively circular arc efo
Span and pitch diameter djRelevant, its scope is ro/dj=0.015~0.025。
In described screw rod contrate tooth profile, the root diameter d of driven screw 2fWith tip diameter djRatio be 1:3；Actively
The root diameter d of screw rod 1jWith tip diameter daRatio be 3:5, the tip diameter d of driven screw 2jWith active screw rod 1
Root diameter djEqual, and equal to pitch diameter dj, described driven screw 2 is equal with the helical pitch of actively screw rod 1.
In described driven screw 2 contrate tooth profile, the radius r of transition arc ab and efoCan be according to during actually used
Different operating modes is selected.roTime bigger, the wearability of driven screw 2 is preferable, but the leakage region during engagement of driving and driven screw rod
Relatively big, the volumetric efficiency of screw pump is relatively low；roTime less, the wearability of driven screw 2 is poor, but during the engagement of driving and driven screw rod
Leakage region less, the volumetric efficiency of screw pump is higher.Usually, transition arc radius r is takenoWith pitch diameter djRatio,
I.e. ro/djThe most suitable equal to about 0.020.Fig. 4 show ro/djDriven spiral shell when respectively equal to 0.015,0.020 and 0.025
The local contrast of bar 2 transition arc；Fig. 5 show ro/djWith driven screw 2 mistake when respectively equal to 0.015,0.020 and 0.025
Cross the local contrast of active screw rod 1 arc envelope line that circular arc is meshed.
Fig. 6 show driven screw 2 transition arc and motion graphics when actively screw rod 1 engages.Due to circular arc and Qi Bao
The engagement process of winding thread more smoothes out, and overcomes the shortcoming that in original profile of tooth, wedge angle is easy to wear, makes the wearability of driven screw 2 show
Write and improve, make the operating lifetime about 30 ~ 40% of whole screw pair.For screw pump, will not cause because of screw rod abrasion
Ullage significantly increases, it is ensured that pump maintains stable volumetric efficiency in whole working life.At active screw rod 1 contrate tooth profile
In, there is rounding off between arc envelope line and root circle.First this eliminate actively screw rod 1 circular peripheral-mill or abrasive grinding wheel
Wedge angle in contour line, makes the wearability of milling cutter or emery wheel significantly improve, and service life extends about 50%.It addition, this is round and smooth
The existence of transition makes the established angle of actively screw rod 1 circular peripheral-mill or abrasive grinding wheel to change within the specific limits, reduces processing
Difficulty, makes more convenient to operate.
Embodiment one, actively screw rod 1 tip diameter da=100mm, following table list this specification actively screw rod 1 and from
Each design size of dynamic screw rod 2, unit: mm.In the present embodiment, in order to reduce leakage region, the volume keeping higher is imitated
Rate, the excessive arc radius r of driven screw 2o =0.9mm。
Embodiment two, actively screw rod 1 tip diameter da=40mm, following table lists this specification actively screw rod 1 and driven
Each design size of screw rod 2, unit: mm.In the present embodiment, in order to increase the wearability of driven screw 2, driven screw 2
Excessive arc radius ro=0.6mm。
Structure, the shape of the present invention is not made any pro forma restriction by above content.Every skill according to the present invention
Any simple modification, equivalent variations and the modification that above example is made by art essence, all still falls within technical solution of the present invention
In the range of.
Claims (4)
1. use three screw rods of circular arc modified tooth profile, including two double end driven screw (2) and a double end actively screw rod
(1), actively the rotation direction of screw rod (1) and two driven screw (2) is contrary, and the screw pair of composition parallel axes external toothing is formed
Conjugate relation, it is characterised in that: every end surface profile of tooth of described driven screw (2) is identical, and every end surface profile of tooth is by First Transition
Circular arc ab, prolate epicycloid bc, driven root circle cd, prolate epicycloid de, the second transition arc ef and driven tooth tip circle fg are altogether
Article six, line smoothing connects composition；Every end surface profile of tooth of described active screw rod (1) is identical, and every end surface profile of tooth is by the first circular arc
Envelope a b, driving tooth tip circle c d, the second arc envelope line e f and active root circle f g totally four curves compositions, its
The b end of middle arc envelope line a b coincides together with the c end of outside circle c d, the d end of outside circle c d and point circular arc bag
The e end of winding thread e f coincides together, and arc envelope line and root circle junction are for being smoothly connected.
A kind of three screw rods using circular arc modified tooth profile the most according to claim 1, it is characterised in that: described active screw rod
(1), in profile of tooth, the conjugate curves of the first arc envelope line a b are corresponding with the First Transition circular arc ab on driven screw (2) to be nibbled
Closing, some b is the prolate epicycloid bc on driven screw (2) with the conjugate curves of some c, the conjugate curves of driving tooth tip circle c d
Engagement corresponding with the driven root circle cd on driven screw (2), the conjugate curves of some d and some e are the upper long width of driven screw (2)
Epicycloid de, the engagement corresponding with the second transition arc ef on driven screw (2) of the conjugate curves of the second arc envelope line e f,
Actively the conjugate curves of root circle f g are the driven tooth tip circle fg of driven screw (2).
A kind of three screw rods using circular arc modified tooth profile the most according to claim 1, it is characterised in that: described driven screw
(2) the transition arc radius r of the excessive circular arc ab and second of in profile of tooth first excessively circular arc efoSpan straight with pitch circle
Footpath djRelevant, its scope is ro/dj=0.015~0.025。
A kind of three screw rods using circular arc modified tooth profile the most according to claim 1, it is characterised in that: described screw rod end face
In profile of tooth, the root diameter d of driven screw (2)fWith tip diameter djRatio be 1:3；Actively the root circle of screw rod (1) is straight
Footpath djWith tip diameter daRatio be 3:5, the tip diameter d of driven screw (2)jRoot diameter with active screw rod (1)
djEqual, and equal to pitch diameter dj, described driven screw (2) is equal with the helical pitch of actively screw rod (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610708585.1A CN106122005B (en) | 2016-08-24 | 2016-08-24 | A kind of three screw rods using circular arc modified tooth profile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610708585.1A CN106122005B (en) | 2016-08-24 | 2016-08-24 | A kind of three screw rods using circular arc modified tooth profile |
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| CN106122005A true CN106122005A (en) | 2016-11-16 |
| CN106122005B CN106122005B (en) | 2018-08-14 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023480A (en) * | 2017-05-12 | 2017-08-08 | 中国石油大学(华东) | A kind of complete smooth twin-screw liquid pump screw rotor |
| CN108050059A (en) * | 2018-01-22 | 2018-05-18 | 中国石油大学(华东) | A kind of nothing is stranded the lobe pump of liquid phenomenon |
| CN110397588A (en) * | 2019-07-29 | 2019-11-01 | 山东劳伦斯流体科技有限公司 | A kind of high-pressure heavy-load Quimby pump |
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| GB954426A (en) * | 1960-04-22 | 1964-04-08 | Pneumatikus Es Hidraulikus Gep | Improvements in or relating to screw pumps |
| CN2881160Y (en) * | 2006-01-19 | 2007-03-21 | 高举成 | Rotary volume compressor |
| CN202493426U (en) * | 2012-02-01 | 2012-10-17 | 河北恒盛泵业股份有限公司 | Novel three-screw pump molded line |
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| CN205937106U (en) * | 2016-08-24 | 2017-02-08 | 黄山工业泵制造有限公司 | Adopt three castellated screw rods of circular arc correction |
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2016
- 2016-08-24 CN CN201610708585.1A patent/CN106122005B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB906430A (en) * | 1959-02-04 | 1962-09-19 | Imo Industri Ab | Improvements in or relating to intermeshing screw pumps |
| GB954426A (en) * | 1960-04-22 | 1964-04-08 | Pneumatikus Es Hidraulikus Gep | Improvements in or relating to screw pumps |
| CN2881160Y (en) * | 2006-01-19 | 2007-03-21 | 高举成 | Rotary volume compressor |
| CN202493426U (en) * | 2012-02-01 | 2012-10-17 | 河北恒盛泵业股份有限公司 | Novel three-screw pump molded line |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107023480A (en) * | 2017-05-12 | 2017-08-08 | 中国石油大学(华东) | A kind of complete smooth twin-screw liquid pump screw rotor |
| CN108050059A (en) * | 2018-01-22 | 2018-05-18 | 中国石油大学(华东) | A kind of nothing is stranded the lobe pump of liquid phenomenon |
| CN110397588A (en) * | 2019-07-29 | 2019-11-01 | 山东劳伦斯流体科技有限公司 | A kind of high-pressure heavy-load Quimby pump |
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| Publication number | Publication date |
|---|---|
| CN106122005B (en) | 2018-08-14 |
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