CN103233894A - Strictly-sealed screw rotor profile of dry-type screw vacuum pump - Google Patents

Strictly-sealed screw rotor profile of dry-type screw vacuum pump Download PDF

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CN103233894A
CN103233894A CN2013101702596A CN201310170259A CN103233894A CN 103233894 A CN103233894 A CN 103233894A CN 2013101702596 A CN2013101702596 A CN 2013101702596A CN 201310170259 A CN201310170259 A CN 201310170259A CN 103233894 A CN103233894 A CN 103233894A
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cycloid
circular arc
involute
radius
corner
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CN103233894B (en
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巫修海
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Zhejiang Ke Ke Xi Power Equipment Co., Ltd.
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Taizhou Vocational and Technical College
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Abstract

The invention discloses a strictly-sealed screw rotor profile of a dry-type screw vacuum pump, which belongs to the technical field of dry-type screw vacuum pumps. The rotor profile disclosed by the invention comprises six sections of curves, namely an involute ab, a transition curve bc, a tooth crest arc cd, a prolate cycloid de, a tooth root arc ef and a transition curve fa. The transition curve bc and the transition curve fa are designed to be with conjugate of arcs and cycloids or conjugate of cycloids and arcs. The two transition curves are respectively added between the tooth crest arc cd and the involute ab and between the tooth root arc ef and the involute ab to form smooth connection, so that leakage areas are avoided and strict sealing is formed. The changes of end faces generated from the smooth connection promote the improvement of dynamic properties. Meanwhile, the transition curves enable the tooth root of a rotor to be smoothly connected with a tooth profile part, so that only one cutter is needed to process the tooth root and the tooth profile and the manufacturing cost is effectively lowered. The dry-type screw vacuum pump with the profile disclosed by the invention can be widely applied to the fields of electrons, semiconductors, chemical industry, food, aerospace and the like.

Description

Strict sealing-type dry-type screw vacuum pump screw rotor molded lines
Technical field:
The present invention relates to dry screw vacuum pump, particularly a kind of dry screw vacuum pump screw rotor molded lines that is applicable to paired strict sealing.
Background technique:
Dry screw vacuum pump is a kind of displacement pump, relies on two screw rotors in the pump to carry gas with the sealed volume that pump housing inner chamber forms, in inlet's formation vacuum of pump.The key technology of dry screw vacuum pump is pair of intermeshing screw rotors, the key of intermeshing rotor is the end face molded lines of rotor, the quality of end face molded lines, the performance of screw vacuum pump will directly be had influence on, as sealing, efficient, area utilization factor etc., determined the manufacturing cost of pump simultaneously.The reasonable molded lines patent of invention of screw vacuum pump rotor performance nearly all is external or the Taiwan application, domestic applications fewer, and relevant problem is many.For example, China's application invention disclosed patent 201010605321.6, it is self conjugate a pair of molded lines of rotor, but do not seamlessly transit between the helix of its design and orthodrome, helix envelope and the little circular arc, special this incomplete conjugation in intersections of complex curve position, two places, have apparent in view leaking area, and the transition region manufacturing is more time-consuming.
Summary of the invention:
Purpose of the present invention is exactly on the basis of drawing domestic and international existing screw vacuum pump molded lines of rotor pluses and minuses, provides a kind of simple and reasonable for structure, and strictness seals fully, performance is good, the screw vacuum pump screw rotor molded lines that work efficiency is high.
Strict sealing-type dry-type screw vacuum pump screw rotor molded lines, the paired screw rotor that is used for the reverse outer gearing of parallel axes, the molded lines end face is designed to single head, a number of screw rod is more than or equal to 2, it is characterized in that, two end face molded lines that screw rotor adopts identical six sections curves to form, comprise one section involute ab, one section transition curve bc, one section tooth top circular arc cd, one segment length's cycloid de, one section tooth root circular arc ef, one section transition curve fa, described involute ab and tooth top circular arc are seamlessly transitted by transition curve bc, described involute ab and tooth root circular arc ef are seamlessly transitted by transition curve fa, and described transition curve bc and transition curve fa are designed to the transition curve of circular arc and cycloid conjugation or cycloid and circular arc conjugation.The present invention forms smooth connection by set up two curves between tooth top circular arc, tooth root circular arc and involute, can avoid forming leaking area, adopt the strict sealing of paired screw rotor of described molded lines, the variation of the end face that reaches thus impels joint with improved dynamic behaviour.The transition arc and the conjugate curve thereof that arrange, no enclose inside zone in engagement process, reduce noise, save driving source, curve transition makes tooth root and the smooth connection of flank profil position of rotor simultaneously, can only process tooth root and flank profil to cutter together with one, can effectively reduce manufacture cost, promote benefit.
Description of drawings:
Fig. 1 is the structural representation of one embodiment of the invention dry screw vacuum pump screw rotor molded lines.
Fig. 2 is the structural representation of another embodiment of the present invention dry screw vacuum pump screw rotor molded lines.
Fig. 3 is one embodiment of the invention rotor axial partial sectional view.
Fig. 4 is one embodiment of the invention screw rotor line of contact axis projection schematic representation.
Fig. 5 is one embodiment of the invention screw rotor space line of contact schematic representation.
Embodiment:
The invention will be further described below in conjunction with drawings and Examples.
The present invention is a kind of paired, conjugation, the dry screw vacuum pump screw rotor molded lines of strict sealing, as depicted in figs. 1 and 2, the end face molded lines that screw rotor 1 and screw rotor 2 adopt identical six sections curves to form, this molded lines is by one section involute ab, one section transition curve bc, one section tooth top circular arc cd, one segment length's cycloid de, one section tooth root circular arc ef, one section transition curve fa is connected to form, described involute ab and tooth top circular arc cd are seamlessly transitted by transition curve bc, described involute ab and tooth root circular arc ef are seamlessly transitted by transition curve fa, and described transition curve bc and transition curve fa are designed to the transition curve of circular arc and cycloid conjugation or cycloid and circular arc conjugation.
Among the embodiment of Fig. 1, the two screw rods rotor is when relative engagement rolling, in the end face molded lines, the end face molded lines a ' b ' of rotor 2 is that the envelope of the involute ab of rotor 1 forms, with the identical involute of involute ab, the transition cycloid f ' a ' of rotor 2 is that the envelope of the circular arc bc of commentaries on classics 1 forms the top circle camber line c ' d ' of rotor 2 and the root circle camber line ef conjugation of rotor 1, the cycloid de of rotor 1 is formed by the some f ' of rotor 2, and the cycloid d ' e ' of rotor 2 is formed by the some f of rotor 1.
Among the embodiment of Fig. 2, the transition cycloid b ' c ' of rotor 2 is that the envelope of the circular arc fa of commentaries on classics 1 forms, and the formation of other curve is identical with the embodiment of Fig. 1.
Among the embodiment of Fig. 1, transition curve bc is circular arc, and corresponding conjugate curve fa is cycloid, and the mode that screw rotor 1 end face molded lines curve forms is as follows:
1) formation of involute ab
Figure BSA00000891936700023
Figure BSA00000891936700031
In the formula: x, y are the right angled coordinatess of putting on the involute,
Figure BSA00000891936700032
Be the corner of any point on the flank profil,
Figure BSA00000891936700033
Be the initial corner of involute,
Figure BSA00000891936700034
Be the angle range of involute, R bBe root radius, R aBe Outside radius, r 1Be transition arc radius, need given initial value, r 0Be the generation circle radius of involute, r 0≤ R b
2) formation of transition arc bc
Figure BSA00000891936700035
Figure BSA00000891936700036
In the formula: r 1Be transition arc radius,
Figure BSA00000891936700037
It is the corner that circular arc forms;
3) formation of top circle camber line cd
ρ＝R a
Figure BSA00000891936700038
In the formula: ρ is circular arc vector radius,
Figure BSA00000891936700039
It is the corner that circular arc forms;
4) formation of cycloid de
Figure BSA000008919367000310
Figure BSA000008919367000311
In the formula: x, y are the right angled coordinatess of putting on the cycloid, R pBe Pitch radius, Be the cycloid corner, β is the initial angle that cycloid rotates in system of coordinates, β value-pi/2;
5) formation of tooth root circular arc ef
ρ＝R b
Figure BSA000008919367000313
In the formula: ρ is circular arc vector radius, It is the corner that circular arc forms;
6) transition cycloid fa, its formation
x 1＝2R pcosα-bcos2α+r 1cosθ
y 1＝2R psinα-bsin2α+r 1sinθ
Figure BSA00000891936700042
b＝R a-r 1， cos θ = b cos 2 α - R p cos α R p 2 + b 2 - 2 R p b cos α , sin θ = b sin 2 α - R p sin α R p 2 + b 2 - 2 R p b cos α ,
Figure BSA00000891936700046
In the formula: x, y are the some right angled coordinatess on the cycloid, Be the cycloid initial position angle, α is that cycloid changes the angle,
Among the embodiment of Fig. 2, transition curve fa is designed to circular arc, and the curve bc of corresponding conjugation is cycloid, and the mode that each segment type line curve forms is as follows:
1) formation of involute ab
Figure BSA00000891936700049
Figure BSA000008919367000410
Figure BSA000008919367000411
Figure BSA000008919367000412
In the formula: x, y are the right angled coordinatess of putting on the involute,
Figure BSA000008919367000413
Be the corner of any point on the flank profil,
Figure BSA000008919367000414
Be the initial corner of involute,
Figure BSA000008919367000415
Be the corner initial value of involute,
Figure BSA000008919367000416
R bBe root radius, R aBe Outside radius, r 0Be the generation circle radius of involute, r 0≤ R b, r 2Be the radius of transition arc, need given initial value;
2) transition cycloid bc, its formation
x 1＝2R pcosα-bcos2α+r 2cosθ
y 1＝2R psinα-bsin2α+r 2sinθ
Figure BSA00000891936700051
b＝R b+r 2， cos θ = b cos 2 α - R p cos α R p 2 + b 2 - 2 R p b cos α , sin θ = b sin 2 α - R p sin α R p 2 + b 2 - 2 R p b cos α ,
Figure BSA00000891936700055
Figure BSA00000891936700056
In the formula: x, y are the some right angled coordinatess on the cycloid,
Figure BSA00000891936700057
Be the cycloid initial position angle, α is that cycloid changes the angle,
Figure BSA00000891936700058
3) formation of top circle camber line cd
ρ＝R a
Figure BSA00000891936700059
In the formula: ρ is circular arc vector radius, It is the corner that circular arc forms;
4) formation of cycloid de
Figure BSA000008919367000511
Figure BSA000008919367000512
In the formula: x, y are the right angled coordinatess of putting on the cycloid, R pBe Pitch radius,
Figure BSA000008919367000513
Be the cycloid corner, β is the initial angle that cycloid rotates in system of coordinates, β value-pi/2;
5) formation of tooth root circular arc ef
ρ＝R b
Figure BSA00000891936700061
In the formula: ρ is circular arc vector radius,
Figure BSA00000891936700062
It is the corner that circular arc forms;
6) formation of transition arc fa
Figure BSA00000891936700063
In the formula: r 2Be transition arc radius,
Figure BSA00000891936700064
It is the corner that circular arc forms.
When the relative engagement rolling of two screw rods rotor, screw rotor 1 will form space pitch curve 3-4-5-6-7-8-9-10 at screw rotor 2, as Fig. 4, shown in Figure 5.Because it is continuous rotating, input cavity and the output cavity that curve has been blocked screw vacuum pump closed in the engagement of screw rotor, and constantly pushes ahead, thereby discharges the gas in the die cavity.
The formation of above-mentioned pair of meshing curve needs a pitch length, for input cavity and output cavity are isolated all the time, before the pair of meshing curve interrupts, must form another to pitch curve in the whole service process, therefore, a number of whole screw rod is greater than and equals 2.In the molded lines of rotor 1, tooth root circular arc ef and involute ab are by transition curve fa smooth connection, making rotor form between tooth root 11 and flank profil 12 seamlessly transits than deep camber, as shown in Figure 3, guaranteed that namely rotor does not have leakage region, constitute a smooth surface 13 with common processing possibility again, improved work efficiency.
In sum, a kind of dry screw vacuum pump molded lines of rotor of the present invention can be applicable to paired screw rotor, two rotor end-face molded lines conjugation, and identical, screw rotor only need adopt left-handed respectively and dextrorotation, can form meshing relation.Use the screw vacuum pump of dry screw vacuum pump molded lines of rotor of the present invention, can be widely used in fields such as electronics, semiconductor, chemical industry, food, space flight.
Certainly, those skilled in the art in the present technique territory should recognize, and above-mentioned enforcement embodiment only is explanation, and is not as limitation of the invention, as long as in the spiritual scope of reality of the present invention, all will drop in the scope of claim of the present invention the variation of above-described embodiment, modification etc.

Claims (4)

1. strict sealing-type dry-type screw vacuum pump screw rotor molded lines, the paired screw rotor that is used for the reverse outer gearing of parallel axes, it is characterized in that, two end face molded lines that rotor adopts identical six sections curves to form, this molded lines is by one section involute ab, one section transition curve bc, one section tooth top circular arc cd, one segment length's cycloid de, one section tooth root circular arc ef, one section transition curve fa is connected to form, described involute ab and tooth top circular arc cd are seamlessly transitted by transition curve bc, described involute ab and tooth root circular arc ef are seamlessly transitted by transition curve fa, and described transition curve bc and transition curve fa are designed to the transition curve of circular arc and cycloid conjugation or cycloid and circular arc conjugation.
2. dry screw vacuum pump molded lines of rotor according to claim 1 is characterized in that, transition curve bc is designed to circular arc, and the curve fa of corresponding conjugation is cycloid, and the mode that each segment type line curve forms is as follows:
1) formation of involute ab
Figure FSA00000891936600011
Figure FSA00000891936600012
Figure FSA00000891936600013
Figure FSA00000891936600014
In the formula: x, y are the right angled coordinatess of putting on the involute,
Figure FSA00000891936600015
Be the corner of any point on the flank profil,
Figure FSA00000891936600016
Be the initial corner of involute,
Figure FSA00000891936600017
Be the angle range of involute, R bBe root radius, R aBe Outside radius, r 0Be the generation circle radius of involute, r 0≤ R b
2) formation of transition arc bc
Figure FSA00000891936600018
In the formula: r 1Be radius of arc, need given initial value,
Figure FSA000008919366000110
It is the corner that circular arc forms;
3) formation of top circle camber line cd
ρ＝R a
Figure FSA000008919366000111
In the formula: ρ is circular arc vector radius,
Figure FSA000008919366000112
It is the corner that circular arc forms;
4) formation of cycloid de
Figure FSA000008919366000113
Figure FSA000008919366000114
In the formula: x, y are the right angled coordinatess of putting on the cycloid, R pBe Pitch radius,
Figure FSA00000891936600021
Be the cycloid corner, β is the initial angle that cycloid rotates in system of coordinates;
5) formation of tooth root circular arc ef
ρ＝R b
Figure FSA00000891936600022
In the formula: ρ is circular arc vector radius,
Figure FSA00000891936600023
It is the corner that circular arc forms;
6) transition cycloid fa, its formation
x 1＝2R pcosα-bcos2α+r 1cosθ
y 1＝2R psinα-bsin2α+r 1sinθ
Figure FSA00000891936600024
Figure FSA00000891936600025
b＝R a-r 1， cos θ = b cos 2 α - R p cos α R p 2 + b 2 - 2 R p b cos α , sin θ = b sin 2 α - R p sin α R p 2 + b 2 - 2 R p b cos α ,
Figure FSA00000891936600028
In the formula: x, y are the some right angled coordinatess on the cycloid,
Figure FSA00000891936600029
Be the corner that cycloid forms, α is that cycloid changes the angle,
Figure FSA000008919366000210
3. dry screw vacuum pump molded lines of rotor according to claim 1 is characterized in that, transition curve fa is designed to circular arc, and the curve bc of corresponding conjugation is cycloid, and the mode that each segment type line curve forms is as follows:
1) formation of involute ab
Figure FSA000008919366000211
Figure FSA000008919366000213
Figure FSA000008919366000214
In the formula: x, y are the right angled coordinatess of putting on the involute,
Figure FSA000008919366000215
Be the corner of any point on the flank profil,
Figure FSA000008919366000216
Be the initial corner of involute, Be the corner initial value of involute,
Figure FSA00000891936600031
R bBe root radius, R aBe Outside radius, r 0Be the generation circle radius of involute, r 0≤ R b, r 2Be the radius of transition arc, need given initial value;
2) transition cycloid bc, its formation
x 1＝2R pcosα-bcos2α+r 2cosθ
y 1＝2R psinα-bsin2α+r 2sinθ
Figure FSA00000891936600032
b＝R b+r 2， cos θ = b cos 2 α - R p cos α R p 2 + b 2 - 2 R p b cos α , sin θ = b sin 2 α - R p sin α R p 2 + b 2 - 2 R p b cos α ,
Figure FSA00000891936600036
Figure FSA00000891936600037
In the formula: x, y are the some right angled coordinatess on the cycloid,
Figure FSA00000891936600038
Be the cycloid initial position angle, α is that cycloid changes the angle,
3) formation of top circle camber line cd
ρ＝R a
Figure FSA000008919366000310
In the formula: ρ is circular arc vector radius,
Figure FSA000008919366000311
It is the corner that circular arc forms;
4) formation of cycloid de
Figure FSA000008919366000312
Figure FSA000008919366000313
In the formula: x, y are the right angled coordinatess of putting on the cycloid, R pBe Pitch radius,
Figure FSA000008919366000314
Be the cycloid corner, β is the initial angle that cycloid rotates in system of coordinates;
5) formation of tooth root circular arc ef
ρ＝R b
Figure FSA000008919366000315
In the formula: ρ is circular arc vector radius,
Figure FSA000008919366000316
It is the corner that circular arc forms;
6) formation of transition arc fa
Figure FSA00000891936600041
In the formula: r 2Be radius of arc,
Figure FSA00000891936600042
It is the corner that circular arc forms.
4. dry screw vacuum pump screw rotor molded lines according to claim 1, it is characterized in that: tooth root circular arc ef and involute ab are by transition curve fa smooth connection, make rotor between tooth root (11) and flank profil (12), form bigger lateral curvature radius and seamlessly transit, constitute a smooth surface (13) with common processing possibility.
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CN105240277A (en) * 2015-11-09 2016-01-13 中国石油大学(华东) Fully-smooth screw rotor of twin-screw vacuum pump
CN105317677A (en) * 2015-11-09 2016-02-10 中国石油大学(华东) Screw rotor without acute-angle cusp
CN105485015A (en) * 2016-01-11 2016-04-13 巫修海 Screw rotor end face molded line of dry screw vacuum pump
CN107023484A (en) * 2017-06-08 2017-08-08 中国石油大学(华东) A kind of asymmetric screw rotor
CN107084131A (en) * 2017-06-08 2017-08-22 中国石油大学(华东) A kind of complete smooth screw rotor based on eccentric circle involute
CN109854504A (en) * 2019-04-02 2019-06-07 萨震压缩机（上海）有限公司 Energy saving screw molded line
CN115143107A (en) * 2022-07-04 2022-10-04 西安交通大学 Conical rotor and dry-type double-screw vacuum pump with same

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CN102003394A (en) * 2010-12-24 2011-04-06 上海耐浦流体机械科技有限公司 Screw vacuum pump rotor profile
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CN203223383U (en) * 2013-04-26 2013-10-02 巫修海 Screw rotor type line of strictly sealed dry type screw vacuum pump

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Publication number Priority date Publication date Assignee Title
CN105240277A (en) * 2015-11-09 2016-01-13 中国石油大学(华东) Fully-smooth screw rotor of twin-screw vacuum pump
CN105317677A (en) * 2015-11-09 2016-02-10 中国石油大学(华东) Screw rotor without acute-angle cusp
CN105485015A (en) * 2016-01-11 2016-04-13 巫修海 Screw rotor end face molded line of dry screw vacuum pump
CN106762661A (en) * 2016-01-11 2017-05-31 台州职业技术学院 A kind of dry screw vacuum pump screw rotor end face molded line
CN107023484A (en) * 2017-06-08 2017-08-08 中国石油大学(华东) A kind of asymmetric screw rotor
CN107084131A (en) * 2017-06-08 2017-08-22 中国石油大学(华东) A kind of complete smooth screw rotor based on eccentric circle involute
CN107084131B (en) * 2017-06-08 2019-05-31 中国石油大学(华东) A kind of complete smooth screw rotor based on eccentric circle involute
CN107023484B (en) * 2017-06-08 2019-05-31 中国石油大学(华东) A kind of asymmetric screw rotor
CN109854504A (en) * 2019-04-02 2019-06-07 萨震压缩机（上海）有限公司 Energy saving screw molded line
CN109854504B (en) * 2019-04-02 2020-03-24 萨震压缩机（上海）有限公司 Energy-saving screw molded line
CN115143107A (en) * 2022-07-04 2022-10-04 西安交通大学 Conical rotor and dry-type double-screw vacuum pump with same

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Patentee before: Wu Xiuhai

Patentee before: Taizhou Vocational & Technical College