CN207864160U - A kind of complete smooth screw rotor - Google Patents

A kind of complete smooth screw rotor Download PDF

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Publication number
CN207864160U
CN207864160U CN201820098574.0U CN201820098574U CN207864160U CN 207864160 U CN207864160 U CN 207864160U CN 201820098574 U CN201820098574 U CN 201820098574U CN 207864160 U CN207864160 U CN 207864160U
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Prior art keywords
curve
molded line
arc
junction
screw rotor
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CN201820098574.0U
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Chinese (zh)
Inventor
魏蜀红
曹晨燕
王君
赵峰
杨舒然
崔锋
沙润东
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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 utility model discloses a kind of complete smooth screw rotor, the left section molded line of left screw rotor is identical with the shape of the right section molded line of right screw rotor and constituent curve;Left section molded line is made of the first junction curve, the conjugate curves of the first junction curve, left addendum circle arc, left claw point elliptic arc, left claw point elliptic arc envelope and left tooth root circular arc;Left section molded line includes two kinds of embodiments:When the first junction curve is sine curve, the conjugate curves of the first junction curve are sinusoidal envelope;When the first junction curve is sinusoidal envelope, the conjugate curves of the first junction curve are sine curve;Two complete correct engagements of screw rotor, connection is completely smooth between the adjacent flank of tooth, there is no region of stress concentrations, with larger area utilization, continuous and shorter space contact line, the smaller leakage triangle of area, improves the sealing performance of Twin-screw vacuum pump, improves final vacuum and rate of air sucked in required.

Description

A kind of complete smooth screw rotor
Technical field
The utility model is related to Twin-screw vacuum pumps, more particularly to are suitable for a kind of complete smooth spiral shell of Twin-screw vacuum pump Bar rotor.
Background technology
Twin-screw vacuum pump is a kind of rotary displacement pump, have it is simple in structure, operate steadily, clean oil-free, adaptation more The advantages of kind of operating mode, the important spare part of Twin-screw vacuum pump are two parallel assembly, intermeshing screw rotors, when work It is moved by the incorgruous dual AC power that synchronizes of two screw rotors, realizes air-breathing, compression and the exhaust process of pumped gas in pump;Spiral shell Performance important of the section molded line of bar rotor to Twin-screw vacuum pump.
The section molded line of general screw rotor is made of 4 sections of curves at present, including tooth root circular arc, addendum circle arc, cycloid, circle Involute, there is the part for being not involved in engagement in the section molded line of the screw rotor, and the space contact line of screw rotor is discontinuous; Patent CN102465871A proposes a kind of screw rotor end face tooth type, constituent curve include cycloid, circular arc and arc envelope line, Elliptic arc and oval envelope curve, the section molded line area utilization is low, and the screw rotor space contact line being generated by it is long;Patent CN103032333A proposes a kind of Twin-screw vacuum pump molded lines of rotor, and pawl point is substituted using arc section at pawl point, and circular arc is total Yoke envelope substitutes cycloid, and the screw rotor leakage triangle area which generates is excessive.
Invention content
In order to solve, existing Twin-screw vacuum pump screw rotor area utilization is low, space contact line is long, leakage triangle The big problem of area, while the type of horn of plenty Twin-screw vacuum pump rotor, the utility model proposes a kind of complete smooth spiral shells Bar rotor:Addendum circle arc and tooth root circular arc are smoothly connected using sine curve and its envelope, using elliptic arc and its envelope Pawl point is corrected, the area utilization of section molded line is improved, reduces the leakage triangle area of screw rotor, and two screw rods Rotor has continuous and shorter space contact line, be conducive to reduce operated adjacent chamber between by space contact line and leakage triangle The leakage of shape improves the final vacuum and rate of air sucked in required of screw rotor.
To achieve the goals above, the utility model adopts the following technical solution:
A kind of complete smooth screw rotor, including left screw rotor (1) and right screw rotor (2), left screw rotor (1) Left section molded line (101) is made of 6 sections of curves, is followed successively by counterclockwise:The first junction curve AB, the first junction curve Conjugate curves BC, left addendum circle arc CD, left claw point elliptic arc DE, left claw point elliptic arc envelope EF, left tooth root circular arc FA are adjacent Connection is completely smooth between constituent curve;The right section molded line (201) of right screw rotor (2) is made of 6 sections of curves, by counterclockwise Direction is followed successively by:Second junction curve ab, the conjugate curves bc of the second junction curve, right addendum circle arc cd, right pawl point elliptic arc De, right pawl point elliptic arc envelope ef, right tooth root circular arc fa are completely smooth connection between adjacent constituent curve;Left section molded line (101) identical with the shape of right section molded line (201) and constituent curve;In the work for synchronizing incorgruous dual AC power movement, Left section molded line (101) is with the situation that engages of the upper each section of curve of right section molded line (201):First junction curve AB and second connects The conjugate curves bc engagements of curve are connect, the conjugate curves BC of the first junction curve is engaged with the second junction curve ab, left outside circle Arc CD is engaged with right tooth root circular arc fa, and left claw point elliptic arc DE is engaged with right pawl point elliptic arc envelope ef, left claw point elliptic arc Envelope EF is engaged with right pawl point elliptic arc de, and left tooth root circular arc FA is engaged with right addendum circle arc cd;Left section molded line (101) The conjugate curves BC of first junction curve AB and the first junction curve includes two kinds of embodiments:When the first junction curve AB is sine When curve, the conjugate curves BC of the first junction curve is sinusoidal envelope;When the first junction curve AB is sine curve Envelope when, the conjugate curves BC of the first junction curve is sine curve.
A kind of described complete smooth screw rotor, the first connection in first embodiment on left section molded line (101) are bent Line AB is designed to that sine curve, the conjugate curves BC of the first junction curve are designed to sinusoidal envelope, and curvilinear equation is such as Under:
Molded line parameter includes:Pitch radius R2, fillet radius R3, back of tooth central angle θ, the first angular frequency1
The equation of first junction curve AB is:
In formula:α=pi/2-θ/2;
The equation of the conjugate curves BC of first junction curve is:
In formula,For the first intermediate parameters, acquired by following formula:
C1、C2、C3、C4For constant.
A kind of described complete smooth screw rotor, the first connection in second embodiment on left section molded line (101) are bent Line AB is designed to that sinusoidal envelope, the conjugate curves BC of the first junction curve are designed to sine curve, and curvilinear equation is such as Under:
Molded line parameter includes:Addendum circle arc radius R1, pitch radius R2, back of tooth central angle θ, the second angular frequency2
The equation of the conjugate curves BC of first junction curve is:
In formula:α=pi/2-θ/2;
The equation of first junction curve AB is:
In formula,For the second intermediate parameters, acquired by following formula:
C5、C6、C7、C8For constant.
A kind of complete smooth screw rotor, the constituent curve of the left section molded line (101) of left screw rotor (1) are left The curvilinear equation of pawl point elliptic arc DE and left claw point elliptic arc envelope EF are as follows:
Molded line parameter includes:Addendum circle arc radius R1, pitch radius R2, elliptic arc major semiaxis m, elliptic arc semi-minor axis n, rotation Gyration γ;
The equation of left claw point elliptic arc DE is:
The equation of left claw point elliptic arc envelope EF is:
In formula:M1For rotational transformation matrix,For initial pawl point elliptic arc envelope:
M1It indicates initial pawl point elliptic arc envelope around left section molded line center O1Rotation γ angles counterclockwise, rotation angle Degree γ is determined by following equation:
In formula:For third intermediate parameters, byIt asks , C9、C10、C11、C12For constant.
A kind of Twin-screw vacuum pump uses a kind of complete smooth screw rotor.
The beneficial effects of the utility model are:
(1) it is completely smooth connection between all adjacent curves on the section molded line of the screw rotor proposed, by section The expansion of molded line spiral generates complete smooth screw rotor, is completely smooth connection between the adjacent flank of tooth, region of stress concentration is not present, Improve the mechanical property of screw rotor;
(2) screw rotor proposed is compared with existing screw rotor, the area utilization with bigger, continuously and more The smaller leakage triangle of short space contact line and area;Be conducive to contact by space between reduction operated adjacent chamber The leakage of line and leakage triangle improves the final vacuum and rate of air sucked in required of screw rotor.
Description of the drawings
Fig. 1 is the left section molded lines of the left screw rotor of first embodiment.
Fig. 2 is the left section molded lines of the left screw rotor of second embodiment.
Fig. 3 is the pawl point elliptic arc figure of left section molded line.
Fig. 4 is the engagement figure of first embodiment left section molded line and right section molded line.
Fig. 5 is the engagement line chart of first embodiment two screw rods rotor.
Fig. 6 is the space contact line figure on the left screw rotor of first embodiment.
Fig. 7 is the engagement figure of first embodiment two screw rods rotor.
In figure:1-left screw rotor;2-right screw rotors;101-left section molded line;201-right section molded line;R1— Addendum circle arc radius;R2- pitch radius;R3- fillet radius;M-elliptic arc major semiaxis;N-elliptic arc semi-minor axis;θ— Back of tooth central angle;γ-rotation angle;O1- left section molded line center;O2- right section molded line center;OtIn-pawl point elliptic arc The heart;lAB- the first back of tooth path of contact;lBC- the second back of tooth path of contact;lCD- outside circle path of contact;lDE- crown path of contact; lEF- concave tooth path of contact;lFA- root circle path of contact;LAB- the first rear flank contact line;LBC- the second rear flank contact line; LCD- crest top land contact line;LDE- face of tooth contact line;LEF- concave tooth face contact line;LFA- root face contact line.
Specific implementation mode
The utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the left section molded line (101) of the left screw rotor of first embodiment (1) is made of 6 sections of curves, by inverse Clockwise is followed successively by:First junction curve AB, the conjugate curves BC of the first junction curve, left addendum circle arc CD, left claw point are ellipse Circular arc DE, left claw point elliptic arc envelope EF, left tooth root circular arc FA are completely smooth connection between adjacent constituent curve;First connects It meets curve AB and is designed to that sine curve, the conjugate curves BC of the first junction curve are designed to sinusoidal envelope, curve side Journey is as follows:
Molded line parameter includes:Pitch radius R2, fillet radius R3, back of tooth central angle θ, the first angular frequency1
The equation of first junction curve AB is:
In formula:α=pi/2-θ/2;
The equation of the conjugate curves BC of first junction curve is:
In formula,For the first intermediate parameters, acquired by following formula:
C1、C2、C3、C4For constant.
As shown in Fig. 2, the left section molded line (101) of the left screw rotor of second embodiment (1) is made of 6 sections of curves, by inverse Clockwise is followed successively by:First junction curve AB, the conjugate curves BC of the first junction curve, left addendum circle arc CD, left claw point are ellipse Circular arc DE, left claw point elliptic arc envelope EF, left tooth root circular arc FA are completely smooth connection between adjacent constituent curve;First connects It meets curve AB and is designed to that sinusoidal envelope, the conjugate curves BC of the first junction curve are designed to sine curve, curve side Journey is as follows:
Molded line parameter includes:Addendum circle arc radius R1, pitch radius R2, back of tooth central angle θ, the second angular frequency2
The equation of the conjugate curves BC of first junction curve is:
In formula:α=pi/2-θ/2;
The equation of first junction curve AB is:
In formula,For the second intermediate parameters, acquired by following formula:
C5、C6、C7、C8For constant.
As shown in figure 3, the centers left claw point elliptic arc DE of left section molded line (101) are pawl point elliptic arc center Ot, OtD connects Line is elliptic arc semi-minor axis, is rotation angle γ with horizontal direction angle;Left claw point elliptic arc DE and left claw point elliptic arc envelope The curvilinear equation of line EF is as follows:
The equation of left claw point elliptic arc DE is:
The equation of left claw point elliptic arc envelope EF is:
In formula:M1For rotational transformation matrix,For initial pawl point elliptic arc envelope:
M1It indicates initial pawl point elliptic arc envelope around left section molded line center O1Rotation γ angles counterclockwise, rotation angle Degree γ is determined by following equation:
In formula:For third intermediate parameters, byIt asks , C9、C10、C11、C12For constant.
As shown in figure 4, left section molded line (101) is identical with the shape of right section molded line (201) and constituent curve; In the work for synchronizing incorgruous dual AC power movement, left section molded line (101) engages feelings with the upper each section of curve of right section molded line (201) Condition is:First junction curve AB is engaged with the conjugate curves bc of the second junction curve, the conjugate curves BC of the first junction curve with Second junction curve ab engagements, left addendum circle arc CD are engaged with right tooth root circular arc fa, and left claw point elliptic arc DE is oval with right pawl point The ef engagements of arc envelope, left claw point elliptic arc envelope EF are engaged with right pawl point elliptic arc de, left tooth root circular arc FA and right tooth top Circular arc cd engagements.
As shown in figure 5, for the engagement line chart of first embodiment two screw rods rotor.First on left section molded line (101) connects It meets curve AB to be meshed with the conjugate curves bc of the second junction curve on right section molded line (201), path of contact is the first tooth Carry on the back path of contact lAB;The conjugate curves BC of the first junction curve on left section molded line (101) and the on right section molded line (201) Two junction curve ab are meshed, and path of contact is the second back of tooth path of contact lBC;Left addendum circle arc CD on left section molded line (101) It is meshed with the right tooth root circular arc fa on right section molded line (201), path of contact is outside circle path of contact lCD;Left section molded line (101) the left claw point elliptic arc DE on is meshed with the right pawl point elliptic arc envelope ef on right section molded line (201), engagement Line is crown path of contact lDE;On left claw point elliptic arc envelope EF and right section molded line (201) on left section molded line (101) Right pawl point elliptic arc de is meshed, and path of contact is concave tooth path of contact lEF;Left tooth root circular arc FA on left section molded line (101) with Right addendum circle arc cd on right section molded line (201) is meshed, and path of contact is root circle path of contact lFA;Two screw rods rotor has Continuous path of contact.
As shown in fig. 6, for the space contact line figure on the left screw rotor of first embodiment (1).First rear flank contact line LABIt is projected as the first back of tooth path of contact l in screw rotor sectionAB;Second rear flank contact line LBCIn screw rotor section It is projected as the second back of tooth path of contact lBC;Crest top land contact line LCDIt is projected as outside circle path of contact l in screw rotor sectionCD;Tooth Sharp face contact line LDEIt is projected as crown path of contact l in screw rotor sectionDE;Concave tooth face contact line LEFIn screw rotor section Be projected as concave tooth path of contact lEF;Root face contact line LFAIt is projected as root circle path of contact l in screw rotor sectionFA;Screw rod The space contact line of rotor is continuous and shorter, can effectively reduce operated adjacent intracavity gas letting out by space contact line Leakage, and then improve the interstage seal performance of Twin-screw vacuum pump.
As shown in fig. 7, for the engagement figure of first embodiment two screw rods rotor.Left screw rotor (1) and right screw rotor (2) It is unfolded to generate along the axis spiral of two screw rotors by corresponding section molded line respectively, is completely smooth between the adjacent flank of tooth Connection;When two screw rotors synchronize incorgruous dual AC power movement, the at a fully engaged of the corresponding flank of tooth can be met, there is no interference Or have neither part nor lot in the part of engagement.
It is above-mentioned although specific embodiments of the present invention are described with reference to the accompanying drawings, but not to this practicality newly The limitation of type protection domain, those skilled in the art should understand that, based on the technical solution of the present invention, ability Field technique personnel need not make the creative labor the various modifications or changes that can be made still in the protection model of the utility model Within enclosing.

Claims (5)

1. a kind of complete smooth screw rotor, including left screw rotor (1) and right screw rotor (2), it is characterized in that:Left screw rod turns The left section molded line (101) of sub (1) is made of 6 sections of curves, is followed successively by counterclockwise:First junction curve AB, first connect Connect conjugate curves BC, left addendum circle arc CD, left claw point elliptic arc DE, left claw point elliptic arc envelope EF, the left root circle of curve Arc FA is completely smooth connection between adjacent constituent curve;The right section molded line (201) of right screw rotor (2) is by 6 sections of curve groups At being followed successively by counterclockwise:Second junction curve ab, the conjugate curves bc of the second junction curve, right addendum circle arc cd, the right side Pawl point elliptic arc de, right pawl point elliptic arc envelope ef, right tooth root circular arc fa are completely smooth connection between adjacent constituent curve; Left section molded line (101) is identical with the shape of right section molded line (201) and constituent curve;Synchronizing incorgruous dual AC power movement Work in, left section molded line (101) is with the situation that engages of the upper each section of curve of right section molded line (201):First junction curve AB is engaged with the conjugate curves bc of the second junction curve, and the conjugate curves BC of the first junction curve is nibbled with the second junction curve ab It closes, left addendum circle arc CD is engaged with right tooth root circular arc fa, and left claw point elliptic arc DE is engaged with right pawl point elliptic arc envelope ef, left Pawl point elliptic arc envelope EF is engaged with right pawl point elliptic arc de, and left tooth root circular arc FA is engaged with right addendum circle arc cd;Left section First junction curve AB of molded line (101) and the conjugate curves BC of the first junction curve includes two kinds of embodiments:When the first connection When curve AB is sine curve, the conjugate curves BC of the first junction curve is sinusoidal envelope;When the first junction curve When AB is sinusoidal envelope, the conjugate curves BC of the first junction curve is sine curve.
2. a kind of complete smooth screw rotor as described in claim 1, it is characterized in that:Left section molded line in first embodiment (101) the first junction curve AB on is designed to that sine curve, the conjugate curves BC of the first junction curve are designed to sine curve Envelope, curvilinear equation is as follows:
Molded line parameter includes:Pitch radius R2, fillet radius R3, back of tooth central angle θ, the first angular frequency1
The equation of first junction curve AB is:
In formula:α=pi/2-θ/2;
The equation of the conjugate curves BC of first junction curve is:
In formula,For the first intermediate parameters, acquired by following formula:
C1、C2、C3、C4For constant.
3. a kind of complete smooth screw rotor as described in claim 1, it is characterized in that:Left section molded line in second embodiment (101) the first junction curve AB on is designed to that sinusoidal envelope, the conjugate curves BC of the first junction curve are designed to Sine curve, curvilinear equation are as follows:
Molded line parameter includes:Addendum circle arc radius R1, pitch radius R2, back of tooth central angle θ, the second angular frequency2
The equation of the conjugate curves BC of first junction curve is:
In formula:α=pi/2-θ/2;
The equation of first junction curve AB is:
In formula,For the second intermediate parameters, acquired by following formula:
C5、C6、C7、C8For constant.
4. a kind of complete smooth screw rotor as described in claim 1, it is characterized in that:The left section type of left screw rotor (1) The curvilinear equation of the constituent curve left claw point elliptic arc DE and left claw point elliptic arc envelope EF of line (101) are as follows:
Molded line parameter includes:Addendum circle arc radius R1, pitch radius R2, elliptic arc major semiaxis m, elliptic arc semi-minor axis n, rotation angle Spend γ;
The equation of left claw point elliptic arc DE is:
The equation of left claw point elliptic arc envelope EF is:
In formula:M1For rotational transformation matrix,For initial pawl point elliptic arc envelope:
M1It indicates initial pawl point elliptic arc envelope around left section molded line center O1Rotation γ angles counterclockwise, rotation angle γ It is determined by following equation:
In formula:For third intermediate parameters, byIt asks , C9、C10、C11、C12For constant.
5. a kind of Twin-screw vacuum pump, it is characterized in that:Use a kind of complete smooth screw rotor as described in claim 1.
CN201820098574.0U 2018-01-22 2018-01-22 A kind of complete smooth screw rotor Active CN207864160U (en)

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Application Number Priority Date Filing Date Title
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Publications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111350665A (en) * 2020-02-25 2020-06-30 宁波鲍斯能源装备股份有限公司 Screw rotor set and hydrogen circulating pump with same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111350665A (en) * 2020-02-25 2020-06-30 宁波鲍斯能源装备股份有限公司 Screw rotor set and hydrogen circulating pump with same
CN111350665B (en) * 2020-02-25 2022-02-18 宁波鲍斯能源装备股份有限公司 Screw rotor set and hydrogen circulating pump with same

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