CN207864168U - A kind of complete smooth screw rotor of low leakage - Google Patents
A kind of complete smooth screw rotor of low leakage Download PDFInfo
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- CN207864168U CN207864168U CN201820098570.2U CN201820098570U CN207864168U CN 207864168 U CN207864168 U CN 207864168U CN 201820098570 U CN201820098570 U CN 201820098570U CN 207864168 U CN207864168 U CN 207864168U
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- arc
- elliptic arc
- screw rotor
- molded line
- section molded
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Abstract
The utility model discloses a kind of complete smooth screw rotors of low leakage, including left screw rotor and right screw rotor, the left section molded line of left screw rotor is made of multinomial helix, left addendum circle arc, left claw point elliptic arc, left elliptic arc envelope, left tooth root circular arc, the right section molded line of right screw rotor is made of multinomial helix conjugate curves, right addendum circle arc, right pawl point elliptic arc, right elliptic arc envelope, right tooth root circular arc, and connection is completely smooth between adjacent two sections of curves；The back of tooth of section molded line is reduced to a curve, is convenient for optimization design and processing；Two complete correct engagements of screw rotor are completely smooth connection between the adjacent flank of tooth, and region of stress concentration is not present, with 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
Technical field
The utility model is related to Twin-screw vacuum pumps, more particularly to are suitable for a kind of the complete of low leakage of Twin-screw vacuum pump
Smooth screw 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；
It is improved on the basis of this molded line later, patent CN105332914A proposes a kind of complete smooth screw rotor, spiral shell
The section molded line of bar rotor is made of 7 sections of curves, the position that tooth root circular arc is connect with circle involute be added to one section of cycloid into
Row is corrected, and is added to one section of circular arc in the position that addendum circle arc is connect with circle involute and is modified, and circular arc is used at pawl point
It corrects.
The section molded line for the screw rotor that the above patent is proposed is by adding fair curve respectively in junction, changing
Kind screw rotor space contact line is discontinuous and cusp problem；But adding fair curve leads to the group of screw rotor section molded line
It is more complicated at curve, it is unfavorable for its optimization design, influences the design and processing of screw rotor, revised screw rotor is still
There is longer space contact line, while leakage triangle area increases after the amendment of pawl point circular arc, the leakage of Twin-screw vacuum pump is asked
Topic improves unobvious.
Invention content
In order to solve, existing Twin-screw vacuum pump screw rotor section molded line is complicated, 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 the complete of low leakage
Smooth screw rotor：It is smoothly connected addendum circle arc and tooth root circular arc using multinomial helix and its conjugate curves so that type
Line is simple, convenient for design and processing；Pawl point is corrected with its conjugate curves so that leakage triangle area reduces using oval；Two
A screw rotor has continuous and shorter space contact line and smaller leakage triangle area, is conducive to reduce operated adjacent chamber
Between by the leakage of space contact line and leakage triangle, improve 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 of low leakage, including left screw rotor (1) and right screw rotor (2), left screw rod
The left section molded line (101) of rotor (1) is made of 5 sections of curves, is followed successively by counterclockwise：Multinomial helix AB, left tooth
Tip circle arc BC, left claw point elliptic arc CD, left elliptic arc envelope DE, left tooth root circular arc EA, complete light between adjacent constituent curve
Slip；The right section molded line (201) of right screw rotor (2) is made of 5 sections of curves, is followed successively by counterclockwise：Multinomial
Helix conjugate curves ab, right addendum circle arc bc, right pawl point elliptic arc cd, right elliptic arc envelope de, right tooth root circular arc ea, phase
Also connection is completely smooth between adjacent constituent curve；In the work for synchronizing incorgruous dual AC power movement, a left side for left screw rotor (1) is cut
Multinomial helix AB, left addendum circle arc BC, left claw point elliptic arc CD on face molded line (101), left elliptic arc envelope DE, a left side
Tooth root circular arc EA, respectively with the multinomial helix conjugate curves ab on the right section molded line of right screw rotor (2) (201), the right side
Tooth root circular arc ea, right elliptic arc envelope de, right pawl point elliptic arc cd, right addendum circle arc bc realize right-on engagement；It is left
The left addendum circle arc BC of section molded line (101), left claw point elliptic arc CD, left elliptic arc envelope DE, left tooth root circular arc EA are around a left side
Section molded line center O1It is ellipse with the right addendum circle arc bc, right pawl point elliptic arc cd, the right side of right section molded line (201) after 180 ° of rotation
Arc envelope line de, right tooth root circular arc ea are completely superposed.
A kind of complete smooth screw rotor of the low leakage, the left section molded line (101) of left screw rotor (1) it is more
The multinomial helix conjugate curves of the right section molded line (201) of item formula helix AB and the right screw rotor (2) being engaged with
The equation of ab is respectively：
The equation of multinomial helix AB is：
The equation of multinomial helix conjugate curves ab is：
In formula：For the first intermediate parameters, byIt acquires；R1For addendum circle arc radius；
R2For pitch radius；R3For fillet radius；θ is back of tooth central angle.
A kind of complete smooth screw rotor of low leakage, the group of the left section molded line (101) of left screw rotor (1)
Equation at curve left claw point elliptic arc CD and left elliptic arc envelope DE is：
The equation of left claw point elliptic arc CD is：
In formula：M1For the first rotational transformation matrix,For initial elliptic arc：
M1It indicates initial elliptic arc around left section molded line center O1Rotate clockwise γ angles；
The equation of left elliptic arc envelope DE is：
In formula：M2For the second rotational transformation matrix,For initial elliptic arc envelope：
M2It indicates initial elliptic arc envelope around left section molded line center O1Rotation γ angles counterclockwise, γ is rotation angle
Degree, is determined by following equation：
In formula：For the second intermediate parameters, by
It acquires, C1、C2、C3、C4For constant；M is elliptic arc major semiaxis；N is elliptic arc semi-minor axis.
A kind of Twin-screw vacuum pump uses a kind of complete smooth screw rotor of low leakage.
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) the section molded line of the screw rotor proposed is smoothly connected tooth root circular arc with multinomial helix and its envelope
And addendum circle arc, tooth back curve is reduced to one, need not add additional fair curve, the constituent curve of section molded line compared with
It is few, it is convenient for optimization design and processing；
(3) screw rotor proposed has continuous and shorter space contact line compared with existing screw rotor, with
And the leakage triangle that area is smaller；Be conducive to reduce letting out by space contact line and leakage triangle between operated adjacent chamber
Leakage, improves the final vacuum and rate of air sucked in required of screw rotor.
Description of the drawings
Fig. 1 is the section molded lines of existing screw rotor.
Fig. 2 is the left section molded lines of left screw rotor.
Fig. 3 is the pawl point elliptic arc enlarged drawing of left section molded line.
Fig. 4 is the right section molded lines of right screw rotor.
Fig. 5 is the engagement figure of left section molded line and right section molded line.
Fig. 6 is the engagement line chart of two screw rods rotor.
Fig. 7 is the space contact line figure on left screw rotor.
Fig. 8 is the engagement figure of two screw rods rotor.
In figure：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；O2In-right section molded line
The heart；Ot- pawl point elliptic arc center；1-left screw rotor；2-right screw rotors；101-left section molded line；201-right sections
Molded line；lAB- back of tooth path of contact；lBC- outside circle path of contact；lCD- crown path of contact；lDE- concave tooth path of contact；lEA- tooth root
Circle path of contact；LAB- rear flank contact line；LBC- crest top land contact line；LCD- face of tooth contact line；LDE- recessed face
Line；LEA- 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, for the section molded lines of existing screw rotor, section molded line is mainly made of 7 sections of curves：Circle is gradually
Burst at the seams AB, the back of tooth is corrected circular arc BC, addendum circle arc CD, pawl point circular arc DE, cycloid equidistant curve EF, tooth root circular arc FG and the back of tooth and is repaiied
Positive cycloid GA is all smoothly connected between adjacent constituent curve；But its back of tooth constituent curve has three, it is complicated, simultaneously
Pawl point uses circular arc amendment, leakage triangle area big.
As shown in Fig. 2, for the left section molded lines of left screw rotor.Left section molded line (101) is made of 5 sections of curves, presses
Counterclockwise it is followed successively by：Multinomial helix AB, left addendum circle arc BC, left claw point elliptic arc CD, left elliptic arc envelope DE,
Left tooth root circular arc EA is completely smooth connection between adjacent constituent curve；Back of tooth central angle is θ, O1For left section molded line center, when
When coordinate system X-axis is the angular bisector of back of tooth central angle θ, O1E lines and the angle of coordinate system X-axis are rotation angle γ；Each section
The equation of curve is as follows：
1. multinomial helix AB：
2. left addendum circle arc BC：
3. left claw point elliptic arc CD：
In formula：M1For the first rotational transformation matrix,For initial elliptic arc：
M1It indicates initial elliptic arc around left section molded line center O1Rotate clockwise γ angles；
4. left elliptic arc envelope DE：
In formula：M2For the second rotational transformation matrix,For initial elliptic arc envelope：
M2It indicates initial elliptic arc envelope around left section molded line center O1Rotation γ angles counterclockwise, γ is rotation angle
Degree, is determined by following equation：
In formula：For the second intermediate parameters, by
It acquires, C1、C2、C3、C4For constant；
5. left tooth root circular arc EA：
As shown in figure 3, for the pawl point elliptic arc enlarged drawing of left section molded line.Elliptic arc major semiaxis is m, elliptic arc semi-minor axis
For n, pawl point elliptic arc center is Ot, OtC lines are elliptic arc semi-minor axis, are rotation angle γ with horizontal direction angle, that is,
Elliptic arc semi-minor axis and O1C line coincidents.
As shown in figure 4, for the right section molded lines of right screw rotor.Right section molded line (201) is made of 5 sections of curves, is pressed
Counterclockwise it is followed successively by：Multinomial helix conjugate curves ab, right addendum circle arc bc, right pawl point elliptic arc cd, right elliptic arc
Envelope de, right tooth root circular arc ea are also completely smooth connection between adjacent constituent curve；The left tooth top of left section molded line (101)
Circular arc BC, left claw point elliptic arc CD, left elliptic arc envelope DE, left tooth root circular arc EA are around left section molded line center O1180 ° of rotation
Afterwards, with the right addendum circle arc bc of right section molded line (201), right pawl point elliptic arc cd, right elliptic arc envelope de, right tooth root circular arc
Ea is completely superposed, O2For right section molded line center；The conjugation that multinomial helix conjugate curves ab is multinomial helix AB is bent
Line, equation are as follows：
In formula：For the first intermediate parameters, byIt acquires.
As shown in figure 5, for the engagement figure of left section molded line and right section molded line.In the work for synchronizing incorgruous dual AC power movement
In, multinomial helix AB, left addendum circle arc BC, left claw point elliptic arc on the left section molded line (101) of left screw rotor (1)
CD, left elliptic arc envelope DE, left tooth root circular arc EA, respectively with it is multinomial on the right section molded line of right screw rotor (2) (201)
Formula helix conjugate curves ab, right tooth root circular arc ea, right elliptic arc envelope de, right pawl point elliptic arc cd, right addendum circle arc bc
Realize right-on engagement.
As shown in fig. 6, for the transverse path of contact figure of two screw rods rotor.Multinomial helix on left section molded line (101)
AB is meshed with the multinomial helix conjugate curves ab on right section molded line (201), and path of contact is back of tooth path of contact lAB；It is left
Left addendum circle arc BC on section molded line (101) is meshed with the right tooth root circular arc ea on right section molded line (201), path of contact
For outside circle path of contact lBC；Left claw point elliptic arc CD on left section molded line (101) and the right ellipse on right section molded line (201)
Arc envelope de is meshed, and path of contact is crown path of contact lCD；Left elliptic arc envelope DE on left section molded line (101) with
Right pawl point elliptic arc cd on right section molded line (201) is meshed, and path of contact is concave tooth path of contact lDE；Left section molded line
(101) the left tooth root circular arc EA on is meshed with the right addendum circle arc bc on right section molded line (201), and path of contact is root circle
Path of contact lEA；Two screw rods rotor has continuous path of contact.
As shown in fig. 7, for the space contact line figure on left screw rotor.Rear flank contact line LABIn screw rotor section
It is projected as back of tooth path of contact lAB；Crest top land contact line LBCIt is projected as outside circle path of contact l in screw rotor sectionBC；Face of tooth
Contact line LCDIt is projected as crown path of contact l in screw rotor sectionCD；Concave tooth face contact line LDEThrowing in screw rotor section
Shadow is concave tooth path of contact lDE；Root face contact line LEAIt is projected as root circle path of contact l in screw rotor sectionEA；Screw rotor
Space contact line be continuous and shorter, leakage of the operated adjacent intracavity gas by space contact line can be effectively reduced,
And then improve the interstage seal performance of Twin-screw vacuum pump.
As shown in figure 8, for the engagement figure of two screw rods rotor.Two screw rotors are respectively by corresponding section molded line edge
The axis spiral expansion of two screw rotors generates, and connection is completely smooth between the adjacent flank of tooth；Synchronization is done in two screw rotors
When incorgruous dual AC power movement, the at a fully engaged of the corresponding flank of tooth can be met, there is no the parts for interfering or having neither part nor lot in 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 (4)
1. a kind of complete smooth screw rotor of low leakage, including left screw rotor (1) and right screw rotor (2), it is characterized in that：
The left section molded line (101) of left screw rotor (1) is made of 5 sections of curves, is followed successively by counterclockwise：Multinomial helix
AB, left addendum circle arc BC, left claw point elliptic arc CD, left elliptic arc envelope DE, left tooth root circular arc EA, between adjacent constituent curve
It is completely smooth connection；The right section molded line (201) of right screw rotor (2) is made of 5 sections of curves, is followed successively by counterclockwise：
Multinomial helix conjugate curves ab, right addendum circle arc bc, right pawl point elliptic arc cd, right elliptic arc envelope de, right root circle
Arc ea is also completely smooth connection between adjacent constituent curve；In the work for synchronizing incorgruous dual AC power movement, left section molded line
(101) it is with the situation that engages of the upper each section of curve of right section molded line (201)：Multinomial helix AB is conjugated with multinomial helix
Curve ab engagements, left addendum circle arc BC are engaged with right tooth root circular arc ea, and left claw point elliptic arc CD is nibbled with right elliptic arc envelope de
It closes, left elliptic arc envelope DE is engaged with right pawl point elliptic arc cd, and left tooth root circular arc EA is engaged with right addendum circle arc bc；Left section
The left addendum circle arc BC of molded line (101), left claw point elliptic arc CD, left elliptic arc envelope DE, left tooth root circular arc EA are around left section
Molded line center O1After 180 ° of rotation, right addendum circle arc bc, right pawl point elliptic arc cd, right elliptic arc with right section molded line (201)
Envelope de, right tooth root circular arc ea are completely superposed.
2. a kind of complete smooth screw rotor of low leakage as described in claim 1, it is characterized in that：Left screw rotor (1)
The multinomial helix AB of left section molded line (101) is more with the right section molded line (201) for the right screw rotor (2) being engaged with
The equation of formula helix conjugate curves ab is respectively：
The equation of multinomial helix AB is：
The equation of multinomial helix conjugate curves ab is：
In formula：For the first intermediate parameters, byIt acquires；R1For addendum circle arc radius；R2For
Pitch radius；R3For fillet radius；θ is back of tooth central angle.
3. a kind of complete smooth screw rotor of low leakage as described in claim 1, it is characterized in that：Left screw rotor (1)
The equation of the constituent curve left claw point elliptic arc CD of left section molded line (101) and left elliptic arc envelope DE is：
The equation of left claw point elliptic arc CD is：
In formula：M1For the first rotational transformation matrix,For initial elliptic arc：
M1It indicates initial elliptic arc around left section molded line center O1Rotate clockwise γ angles；
The equation of left elliptic arc envelope DE is：
In formula：M2For the second rotational transformation matrix,For initial elliptic arc envelope：
M2It indicates initial elliptic arc envelope around left section molded line center O1Rotation γ angles counterclockwise, γ is rotation angle, by
Following equation determines：
In formula：For the second intermediate parameters, byIt asks
, C1、C2、C3、C4For constant；M is elliptic arc major semiaxis；N is elliptic arc semi-minor axis.
4. a kind of Twin-screw vacuum pump, it is characterized in that：Use a kind of complete smooth screw rod of low leakage as described in claim 1
Rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820098570.2U CN207864168U (en) | 2018-01-22 | 2018-01-22 | A kind of complete smooth screw rotor of low leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820098570.2U CN207864168U (en) | 2018-01-22 | 2018-01-22 | A kind of complete smooth screw rotor of low leakage |
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| CN207864168U true CN207864168U (en) | 2018-09-14 |
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|---|---|---|---|
| CN201820098570.2U Expired - Fee Related CN207864168U (en) | 2018-01-22 | 2018-01-22 | A kind of complete smooth screw rotor of low leakage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108050069A (en) * | 2018-01-22 | 2018-05-18 | 中国石油大学(华东) | A kind of complete smooth screw rotor of low leakage |
| 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 |
| CN111350664A (en) * | 2020-02-18 | 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 |
-
2018
- 2018-01-22 CN CN201820098570.2U patent/CN207864168U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108050069A (en) * | 2018-01-22 | 2018-05-18 | 中国石油大学(华东) | A kind of complete smooth screw rotor of low leakage |
| CN111350664A (en) * | 2020-02-18 | 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 |
| CN111350664B (en) * | 2020-02-18 | 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 |
| 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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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180914 Termination date: 20220122 |
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| CF01 | Termination of patent right due to non-payment of annual fee |