CN105240277B - Fully-smooth screw rotor of twin-screw vacuum pump - Google Patents

Fully-smooth screw rotor of twin-screw vacuum pump Download PDF

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Publication number
CN105240277B
CN105240277B CN201510756059.8A CN201510756059A CN105240277B CN 105240277 B CN105240277 B CN 105240277B CN 201510756059 A CN201510756059 A CN 201510756059A CN 105240277 B CN105240277 B CN 105240277B
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China
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circle
tooth
cycloid
screw rotor
arc
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CN105240277A (en
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王君
刘宏杰
崔峰
李强
王增丽
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China University of Petroleum UPC East China
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China University of Petroleum UPC East China
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Abstract

The invention discloses a fully-smooth screw rotor of a twin-screw vacuum pump, and belongs to the technical field of dry-process twin-screw vacuum pumps. An end surface molded line of the screw rotor consists of 7 sections of curves which are smoothly connected without cuspidal points; a circular-arc DE and an equidistant curve EF of a cycloid are used for smoothly connecting a tooth-crest circular arc CD with a tooth-root circular arc FG; a circular arc GA is adopted for smoothly connecting the tooth-root circular arc FG with a circle involute AB; an equidistant curve BC of the cycloid is used for smoothly connecting the circle involute AB with the tooth-crest circular arc CD; and two screw rotor end surface molded lines which are conjugated and engaged with each other are the same, so that correct engagement can be realized in work; and the screw rotor generated by the screw rotor end surface molded lines consists of 7 tooth surfaces, and all tooth surfaces of the screw rotor are in smooth transition for eliminating an area which easily generates stress focus. The screw rotor has the advantages of high strength, good tightness, small abrasion and a long service life.

Description

A kind of complete smooth screw rotor of Twin-screw vacuum pump
Technical field
The present invention relates to dry type Twin-screw vacuum pump, more particularly to suitable for a kind of complete smooth of dry type Twin-screw vacuum pump Screw rotor.
Background technology
Dry type Twin-screw vacuum pump is a kind of positive-displacement vacuum pump, is by 2 screw rotors that can realize engagement Synchronous incorgruous dual AC power motion, forms periodically variable working chamber volume between 2 screw rotors and pump housing inner chamber, realizes Suction, supercharging and the discharge of gas, in the entrance of pump vacuum is formed;Screw rotor be by screw rotor end face molded line vertically Make spiral and launch what is generated;Therefore the performance of screw rotor end face molded line, and the conjugation between 2 screw rotor end face molded line is nibbled Close the performance that performance directly affects Twin-screw vacuum pump;Therefore screw rotor end face molded line to the sealing of Twin-screw vacuum pump, Efficiency, area utilization factor affect very big.
Conventional screw rotor end face molded line is the combination line style of circle involute, cycloid and circular arc;The invention of China's application Patent (application number 201310170259.6) discloses a kind of screw rotor end face molded line, is made up of 6 sections of curves, including:Gradually open Line, easement curve, addendum circle arc, long cycloid, tooth root circular arc, easement curve;Patent of invention (the application number of China's application 201510169195.7) a kind of screw rotor end face molded line is disclosed, is made up of 6 sections of curves, including:Involute, easement curve, Addendum circle arc, long cycloid, tooth root circular arc, easement curve.
It is to adopt long cycloid connection addendum circle arc and tooth root circular arc in above-mentioned screw rotor end face molded line, but tooth It is not only slip between tip circle arc and long cycloid, there is cusp;In theory, point can be realized correctly engaging with cycloid; But the screw rotor end face molded line that there is cusp has the disadvantages that:Screw rotor end face molded line has cusp to be caused to be generated Screw rotor there is the rough place of the flank of tooth, easily produce stress concentration, washed away mutability by fluid at the rough place of the flank of tooth Shape, the life-span easy to wear, screw rotor is low, sealing property is poor, gas leakage it is larger, affect Twin-screw vacuum pump the limit it is true Reciprocal of duty cycle and pumping speed.
The content of the invention
The present invention proposes a kind of complete smooth screw rotor of Twin-screw vacuum pump, its screw rod to solve the above problems Rotor end-face molded line includes 7 sections of curves, adopts mutually 1 section of circular arc DE of conjugation engagement and equidistant curve EF of 1 section of cycloid by tooth Tip circle arc CD and tooth root circular arc FG are smoothly connected, and are smoothly connected tooth root circular arc FG and circle involute AB using circular arc GA, adopt Equidistant curve BC of cycloid is smoothly connected circle involute AB and addendum circle arc CD;Eliminate the point in screw rotor end face molded line Point, has obtained complete smooth screw rotor end face molded line;2 entirely smooth screw rotor end face molded line of identical are incorgruous in synchronization In dual AC power motion, the circular arc of side screw rotor end face molded line, the equidistant curve of cycloid, respectively with opposite side screw rotor end The equidistant curve of the cycloid of face molded line, circular arc can realize correct engagement;Thus the spiral shell that screw rotor end face molded line is generated Bar rotor, is not only able to meet correct engagement, and its flank of tooth is realized all smoothly transitting;Improve the sealing of screw rotor Performance, intensity, life-span so that the screw rotor can be applied to more high-revolving operating condition, while it is true to improve twin-screw The final vacuum and pumping speed of empty pump;The screw rotor for being proposed has important meaning for the performance for improving Twin-screw vacuum pump Justice.
To achieve these goals, the present invention is adopted the following technical scheme that:
Screw rotor makees at work synchronous incorgruous dual AC power motion, according to the conjugation theory of engagement of molded line, determines the fortune The equidistant curve and its relative position of the cycloid being meshed with circular arc under flowing mode, realize circular arc and addendum circle arc be smoothly connected, Circular arc and the equidistant curve of cycloid are smoothly connected, the equidistant curve of cycloid and root circle are smoothly connected, and obtain complete smooth screw rod Rotor end-face molded line;Thus complete smooth screw rotor end face molded line makees vertically spiral and launches the complete smooth screw rod turn of generation Son, the screw rotor for being generated have all smoothly transit between 7 flank of tooth, and 7 flank of tooth;The screw rod of 2 screw rotors turns Sub- profile is identical and can realize correct engagement at work, so as to improve the combination property of screw rotor.
A kind of complete smooth screw rotor end face molded line of Twin-screw vacuum pump, is made up of 7 sections of curves, is followed successively by:Circle is gradually Burst at the seams AB, equidistant curve BC of cycloid, addendum circle arc CD, circular arc DE, equidistant curve EF of cycloid, tooth root circular arc FG and circular arc GA;Equidistant curve EF of cycloid be the equidistant curve of cycloid (1) with origin O as pivot, after rotate counterclockwise γ angle Arrive;Addendum circle arc CD is smoothly connected with circular arc DE, and circular arc DE is smoothly connected with equidistant curve EF of cycloid, the equidistant curve of cycloid EF is smoothly connected with tooth root circular arc FG, realizes that screw rotor end face molded line is all smoothly connected, and there is no cusp, while ensureing tooth The central angle of tip circle arc CD is equal with the central angle of tooth root circular arc FG.
A kind of complete smooth screw rotor of Twin-screw vacuum pump, is made vertically by complete smooth screw rotor end face molded line Spiral launches to generate, and spiral number of turns are more than 2, are made up of 7 flank of tooth, are followed successively by:Crest top land (11), the flank of tooth (12), pitch face (13), circular-arc tooth surface (14), root face (15), concave tooth face (16), circular-arc tooth surface (17);These flank of tooth are successively by screw rotor end Equidistant curve BC of addendum circle arc CD, cycloid in the molded line of face, circle involute AB, circular arc GA, tooth root circular arc FG, cycloid it is equidistant Curve EF and circular arc DE make vertically spiral and launch to generate;Described crest top land (11) smoothly transits with circular-arc tooth surface (17), circle Curved tooth face (17) smoothly transits with concave tooth face (16), and concave tooth face (16) smoothly transit with root face (15), whole screw rotor The flank of tooth all smoothly transits;The screw rotor end face molded line of intermeshing 2 complete smooth screw rotors is identical, 2 full light Sliding screw rotor can realize at work the correct engagement of whole flank of tooth.
A kind of Twin-screw vacuum pump, using a kind of above-mentioned complete smooth screw rotor.
Beneficial effects of the present invention are:
The screw rotor end face molded line for being proposed does not have cusp, is complete smooth;Thus complete smooth screw rotor end face Molded line makees vertically spiral expansion, generates complete smooth screw rotor, and its whole flank of tooth smoothly transits;At work, mutually nibble The screw rotor end face molded line of the 2 complete smooth screw rotors for closing is identical;Therefore improve screw rotor sealing property and Mechanical property, improves the final vacuum and pumping speed of Twin-screw vacuum pump.
Description of the drawings
Fig. 1 is existing screw rotor end face molded lines.
Fig. 2 is a kind of complete smooth screw rotor end face molded lines of the Twin-screw vacuum pump for being proposed.
Fig. 3 is the engagement figure of the complete smooth screw rotor end face molded line in proposed 2.
Fig. 4 is engagement figure of the complete smooth screw rotor end face molded line in proposed 2 in different angles.
Fig. 5 is a kind of generating process figure of the complete smooth screw rotor end face molded line of the Twin-screw vacuum pump for being proposed.
Fig. 6 is the engagement figure of the complete smooth screw rotor in proposed 2.
Fig. 7 is a kind of complete smooth screw rotor figure of the Twin-screw vacuum pump for being proposed.
In figure:R1- radius of addendum;R2- pitch radius;R3- root radius;RbThe basic circle of-circle involute half Footpath;301st, 302-screw rotor end face molded line;1st, 3-cycloid;2-circle involute;4-outside circle;5-root circle;6、9— Circle;7th, the equidistant curve of 10-cycloid;8-circle involute;α, β, γ-angle;r1The radius of-circle (6);r2The half of-circle (9) Footpath;11-crest top land;12-flank of tooth;13-pitch face;14-circular-arc tooth surface;15-root face;16-concave tooth face;17-circular arc The flank of tooth;18-root face;19-circular-arc tooth surface;20-pitch face;21-flank of tooth;22-crest top land;23-circular-arc tooth surface;24— Concave tooth face.
Specific embodiment
Below in conjunction with the accompanying drawings the invention will be further described with embodiment.
As shown in figure 1, the tie point D between addendum circle arc CD and cycloid DE of existing screw rotor end face molded line is not for Slick spot, i.e. cusp.
As shown in Fig. 2 a kind of complete smooth screw rotor end face molded line of the Twin-screw vacuum pump for being proposed is by 7 sections of curves Composition, is followed successively by:Circle involute AB, equidistant curve BC of cycloid, addendum circle arc CD, circular arc DE, equidistant curve EF of cycloid, tooth Root circular arc FG and circular arc GA;Using mutually 1 section of circular arc DE of conjugation engagement and equidistant curve EF of 1 section of cycloid by addendum circle arc CD Be smoothly connected with tooth root circular arc FG, be smoothly connected tooth root circular arc FG and circle involute AB using circular arc GA, using cycloid etc. Circle involute AB and addendum circle arc CD are smoothly connected away from curve BC;7 sections of curves of described composition screw rotor end face molded line All it is smoothly connected between middle adjacent curve, there is no cusp, forms complete smooth screw rotor end face molded line.
As shown in figure 3, for the engagement figure between 2 complete smooth screw rotor end face molded line (301) and (302), mutually 2 of engagement are complete, and smooth screw rotor end face molded line (301) is identical with (302), at work screw rotor end face molded line (301) composition molded line:Circle involute AB, equidistant curve BC of cycloid, addendum circle arc CD, circular arc DE, the equidistant curve of cycloid EF, tooth root circular arc FG, circular arc GA, respectively with the composition molded line of screw rotor end face molded line (302):Circle involute ab, circular arc ga, Tooth root circular arc fg, equidistant curve ef of cycloid, circular arc de, addendum circle arc cd, equidistant curve bc of cycloid can be realized correctly Engagement.
As shown in figure 4, for 2 complete smooth screw rotor end face molded line different angles engagement figure, (a)~(i) figure In angle of eccentricity corresponding to each neighbor map be staggered 10 °;I.e. (a) figure is to screw rotor end face molded line (301) dextrorotation of (b) figure Turn 10 °, 10 ° of screw rotor end face molded line (302) rotate counterclockwise;B () figure is suitable to (c) figure screw rotor end face molded line (301) Hour hands rotate 10 °, 10 ° of screw rotor end face molded line (302) rotate counterclockwise;By that analogy;In (a), (b), (c) and (d) figure In, equidistant curve ef of the cycloid in circular arc DE and screw rotor end face molded line (302) in screw rotor end face molded line (301) Intermeshing;In (f), (g), (h) and (i) figure, equidistant curve EF and spiral shell of the cycloid in screw rotor end face molded line (301) Circular arc de intermeshings in bar rotor end-face molded line (302);The composition molded line of screw rotor end face molded line (301):Circle is gradually opened Line AB, equidistant curve BC of cycloid, addendum circle arc CD, circular arc DE, equidistant curve EF of cycloid, tooth root circular arc FG, circular arc GA, point Not with the composition molded line of screw rotor end face molded line (302):Circle involute ab, circular arc ga, tooth root circular arc fg, the equidistant song of cycloid Line ef, circular arc de, addendum circle arc cd, equidistant curve bc of cycloid can realize correct engagement.
As shown in figure 5, a kind of generating process figure of the complete smooth screw rotor end face molded line for Twin-screw vacuum pump;Entirely The generating process of smooth screw rotor end face molded line is as follows:
1. as shown in Fig. 5 (a), 5 sections of curves are generated by below equation, respectively:Cycloid (1), circle involute (2), cycloid (3), outside circle (4) and root circle (5), the equation of each section of curve is as follows:
The equation of cycloid (1) is:
The equation of circle involute (2) is:
The equation of cycloid (3) is:
The equation of outside circle (4) is:
The equation of root circle (5) is:
More than:T-angle parameter, rad;R1- radius of addendum, mm;R2- pitch radius, mm;R3- root radius, mm;RbThe base radius of-circle involute, mm;r1- arc radius, mm;r2- arc radius, mm;
2. as shown in Fig. 5 (b), by cycloid (1) pair-wise offset 2r laterally1, the curve after skew is counterclockwise further around origin O Rotation γ angles, with origin O as the center of circle, radius is as R1-r1Circle intersect, make radius as r by the center of circle of its intersection point1Circle (6), circle (6) is tangent with outside circle (4), and its point of contact is D;By cycloid (1) pair-wise offset r laterally1, the curve after skew further around Origin O rotate counterclockwise γ angles, obtain the equidistant curve (7) of cycloid, the equidistant curve (7) of cycloid and meanwhile with circle (6) and tooth Root circle (5) is tangent, and its point of contact is respectively E, F;Obtain equidistant curve EF of circular arc DE and cycloid;Angle γ is determined by equation below:
(x0,y0) be following 2 curve intersection point:
x2+y2=(R1-r1)2
3. as shown in Fig. 5 (b), circle involute (2) is turned clockwise α angles around origin O, obtains circle involute (8);Will After cycloid (3) rotate counterclockwise β angle, then pair-wise offset r laterally2, obtain the equidistant curve (10) of cycloid, cycloid it is equidistant While tangent with circle involute (8) and outside circle (4), its point of contact is respectively B, C to curve (10);Obtain equidistant curve BC of cycloid With addendum circle arc CD;Angle [alpha], β are determined by equation below:
4. as shown Fig. 5 (b), work and the line segment OG that Ox axle clamps angle is β, line segment OG and the center of circle are origin O, radius is R3+r2 Circle intersect, make radius as r by the center of circle of its intersection point2Circle (9), circle (9) and meanwhile with root circle (5) and circle involute (8) phase Cut, its point of contact is respectively G, A;Obtain circular arc GA, tooth root circular arc FG and circle involute AB.
As shown in fig. 6, for the engagement figure of 2 complete smooth screw rotors, intermeshing 2 complete smooth screw rotors Screw rotor end face molded line it is identical, screw rotor (601) for screw rotor end face molded line make vertically counter-clockwise helical launch Generate, screw rotor (602) makees vertically clock wise spirals and launches to generate for screw rotor end face molded line, and at work screw rod turns The crest top land (11) of sub (601), the flank of tooth (12), pitch face (13), circular-arc tooth surface (14), root face (15), concave tooth face (16), circle Curved tooth face (17), root face (18) respectively with screw rotor (602), circular-arc tooth surface (19), pitch face (20), the flank of tooth (21), Crest top land (22), circular-arc tooth surface (23), concave tooth face (24) can realize correct engagement.
As shown in fig. 7, for a kind of complete smooth screw rotor figure of Twin-screw vacuum pump, complete smooth screw rotor be by Complete smooth screw rotor end face molded line makees vertically spiral and launches to generate, and spiral number of turns are more than 2, are made up of 7 flank of tooth, successively For:Crest top land (11), the flank of tooth (12), pitch face (13), circular-arc tooth surface (14), root face (15), concave tooth face (16), circular-arc tooth surface (17);Wherein crest top land (11) smoothly transits with circular-arc tooth surface (17), and circular-arc tooth surface (17) smoothly transits with concave tooth face (16), recessed The flank of tooth (16) smoothly transits with root face (15), and the adjacent flank of tooth of whole screw rotor all smoothly transits.
A kind of the characteristics of complete smooth screw rotor of the Twin-screw vacuum pump for being proposed is:Complete smooth screw rotor by Complete smooth screw rotor end face molded line makees vertically spiral and launches to generate, and complete smooth screw rotor end face molded line is by 7 sections of songs Line is constituted:Circle involute AB, equidistant curve BC of cycloid, addendum circle arc CD, circular arc DE, equidistant curve EF of cycloid, root circle Arc FG and circular arc GA;All be smoothly connected between adjacent curve, there is no cusp, 2 identical screw rotor end face molded line it Between can realize correct engagement;Thus complete smooth screw rotor end face molded line generates complete smooth screw rotor, comprising 7 The flank of tooth, is followed successively by:Crest top land (11), the flank of tooth (12), pitch face (13), circular-arc tooth surface (14), root face (15), concave tooth face (16), circular-arc tooth surface (17), all smoothly transit between the adjacent flank of tooth, therefore can effectively improve the mechanical property of screw rotor And meshing performance, the abrasion and deformation of screw rotor are reduced, eliminate and easily produce the region of stress concentration, and be conducive to gas Sealing;Thus the complete smooth screw rotor for being proposed with higher intensity and good sealing property, while improve The final vacuum and pumping speed of Twin-screw vacuum pump.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not to present invention protection model The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.

Claims (4)

1. the complete smooth screw rotor of a kind of Twin-screw vacuum pump, its left screw rotor end face molded line (301) is including 7 sections of songs Line:Left circle involute AB, equidistant curve BC of left first cycloid, left addendum circle arc CD, left first circular arc DE, left second cycloid Equidistant curve EF, left tooth root circular arc FG and left second circular arc GA;It is characterized in that:1 section of circular arc of a left side first is engaged using mutually conjugation Equidistant curve EF of DE and 1 section of cycloid of a left side second is smoothly connected left addendum circle arc CD and left tooth root circular arc FG, using left second Circular arc GA is smoothly connected left tooth root circular arc FG and left circle involute AB, using equidistant curve BC of left first cycloid by left circle gradually Burst at the seams AB and left addendum circle arc CD is smoothly connected;It is adjacent in 7 sections of curves of the left screw rotor end face molded line (301) of described composition All it is smoothly connected between curve, there is no cusp, forms complete smooth screw rotor end face molded line;Left screw rotor end face type Line (301) is identical with the constituent curve of right screw rotor end face molded line (302), can realize in synchronous incorgruous dual AC power motion Correct engagement, the left circle involute AB, equidistant curve BC, the left side of left first cycloid in left screw rotor end face molded line (301) Addendum circle arc CD, left first circular arc DE, equidistant curve EF of left second cycloid, left tooth root circular arc FG and left second circular arc GA, point Not with right screw rotor end face molded line (302) in right circle involute ab, right second circular arc ga, right tooth root circular arc fg, right second Equidistant curve bc of equidistant curve ef of cycloid, right first circular arc de, right addendum circle arc cd and right first cycloid can be realized just True engagement,
The generation method of its screw rotor end face molded line is as follows:
1. the equation of the first cycloid (1), the first circle involute (2), the second cycloid (3), outside circle (4) and root circle (5) is as follows:
The equation of the first cycloid (1) is:
The equation of the first circle involute (2) is:
The equation of the second cycloid (3) is:
The equation of outside circle (4) is:
The equation of root circle (5) is:
More than:T-angle parameter, rad;R1- radius of addendum, mm;R2- pitch radius, mm;R3- root radius, mm; RbThe base radius of-circle involute, mm;r1- arc radius, mm;r2- arc radius, mm;
2. the first cycloid (1) pair-wise offset 2r laterally1, the curve after skew further around origin O rotate counterclockwise γ angles, with Origin O is the center of circle, radius is R1-r1Circle intersect, make radius as r by the center of circle of its intersection point1Crown circle (6), crown circle (6) Tangent with outside circle (4), its point of contact is D;First cycloid (1) pair-wise offset r laterally1, the curve after skew is inverse further around origin O Hour hands rotate γ angles, obtain the place curve (7) of equidistant curve EF of left second cycloid, equidistant curve EF of left second cycloid Place curve (7) and meanwhile with crown justify (6) and root circle (5) it is tangent, its point of contact is respectively E, F;Thereby determine that left first justifies Equidistant curve EF of arc DE and left second cycloid;Angle γ is determined by equation below:
(x0,y0) be following 2 curve intersection point:
3. the first circle involute (2) turns clockwise α angles around origin O, as the second circle involute (8);Second cycloid (3) is inverse After hour hands rotation β angle, then pair-wise offset r laterally2, the place curve (10) of equidistant curve BC of as left first cycloid, While tangent with the second circle involute (8) and outside circle (4), it cuts the place curve (10) of equidistant curve BC of left first cycloid Point is respectively B, C;Thereby determine that equidistant curve BC and left addendum circle arc CD of left first cycloid;Angle [alpha], β are true by equation below It is fixed:
4. the line segment OG with Ox axle clamps angle for β is made, it is R that line segment OG and the center of circle are origin O, radius3+r2Circle intersect, with its intersection point Make radius for r for the center of circle2Back of tooth circle (9), back of tooth circle (9) while tangent with root circle (5) and the second circle involute (8), its Point of contact is respectively G, A;Thereby determine that left second circular arc GA, left tooth root circular arc FG and left circle involute AB.
2. a kind of complete smooth screw rotor of Twin-screw vacuum pump as claimed in claim 1, is characterized in that:Spiral number of turns are big In 2, it is made up of 7 flank of tooth:Left crest top land (11), the left flank of tooth (12), left pitch face (13), left first circular-arc tooth surface (14), a left side Root face (15), left concave tooth face (16), left second circular-arc tooth surface (17), these flank of tooth are successively by left screw rotor end face molded line (301) left addendum circle arc CD, equidistant curve BC of left first cycloid in, left circle involute AB, left second circular arc GA, left tooth root Circular arc FG, equidistant curve EF of left second cycloid and left first circular arc DE make vertically spiral and launch to generate;Described composition spiral shell In 7 flank of tooth of bar rotor, all smoothly transit between the adjacent flank of tooth, form complete smooth screw rotor.
3. a kind of complete smooth screw rotor of Twin-screw vacuum pump as claimed in claim 1, is characterized in that:Left screw rotor (601) make counter-clockwise helical vertically for left screw rotor end face molded line (301) to launch to generate, right screw rotor (602) is the right side Screw rotor end face molded line (302) makees vertically clock wise spirals and launches to generate, and left screw rotor can be realized at work (601) left crest top land (11), the left flank of tooth (12), left pitch face (13), left first circular-arc tooth surface (14), left root face (15), Left concave tooth face (16), left second circular-arc tooth surface (17), right root face (18) respectively with right screw rotor (602), right first circle Curved tooth face (19), right pitch face (20), the right flank of tooth (21), right crest top land (22), right second circular-arc tooth surface (23), right concave tooth face (24) correct engagement can be realized.
4. a kind of Twin-screw vacuum pump, is characterized in that:Using screw rotor as claimed in claim 1.
CN201510756059.8A 2015-11-09 2015-11-09 Fully-smooth screw rotor of twin-screw vacuum pump Expired - Fee Related CN105240277B (en)

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