CN107023484A - A kind of asymmetric screw rotor - Google Patents
A kind of asymmetric screw rotor Download PDFInfo
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- CN107023484A CN107023484A CN201710426711.9A CN201710426711A CN107023484A CN 107023484 A CN107023484 A CN 107023484A CN 201710426711 A CN201710426711 A CN 201710426711A CN 107023484 A CN107023484 A CN 107023484A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/082—Details specially related to intermeshing engagement type pumps
- F04C18/084—Toothed wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/20—Rotors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Rotary Pumps (AREA)
Abstract
The invention discloses a kind of asymmetric screw rotor, screw rotor by a pair of shapes it is different, it is parallel assembling and intermeshing screw rotor constitute；The shape and constituent curve of two screw rotor end face molded line are differed, and are made up of, are seamlessly transitted completely between adjacent two sections of curves, the homologous thread on the profile of two screw rotors is at a fully engaged 5 sections of curves respectively；Thus two screw rotors of the profile generation of screw rotor, are made up of 5 flank of tooth, are seamlessly transitted completely between the adjacent flank of tooth, in the absence of region of stress concentration, the corresponding flank of tooth of two screw rotors is at a fully engaged respectively sideways；A kind of asymmetric screw rotor proposed, with continuous and shorter space contact line；Leakage path is not present between two neighboring working chamber, it is smaller by the leakage of space contact line, and then the sealing property of Twin-screw vacuum pump is improved, improve the final vacuum of Twin-screw vacuum pump.
Description
Technical field
The present invention relates to Twin-screw vacuum pump, more particularly to turn suitable for a kind of asymmetric screw rod of Twin-screw vacuum pump
Son.
Background technology
Twin-screw vacuum pump is a kind of volume type rotor pump, with it is simple in construction, operate steadily, clean oil-free, adapt to it is many
The advantage of operating mode is planted, is widely used in semiconductor, chemical industry, electronics, nuclear energy, food, field of medicaments；Twin-screw vacuum pump it is main
Parts are parallel assembling, intermeshing two screw rotors, pass through the synchronization incorgruous double back of two screw rotors during work
Transhipment is dynamic, realizes the air-breathing of pumped gas, compression and exhaust process in pump；The structure of screw rotor, especially profile
Structure, directly affects rate of air sucked in required, interstage seal and the final vacuum of Twin-screw vacuum pump.
Single head concave tooth face Twin-screw vacuum pump conventional at present, two screw rotors meet engagement and transmission rule and each other
Conjugation, its profile is made up of 4 sections of curves, is respectively：Tooth root circular arc, addendum circle arc, cycloid, circle involute, wherein tooth root
The basic circle center of circle of circular arc, the center of circle of addendum circle arc and circle involute is overlapped, and the profile of the screw rotor, which exists, to be not involved in nibbling
The part of conjunction, and the space contact line of screw rotor is discontinuous, there is obvious leakage path during work；Screw rotor is ground
Study carefully, it is modified and is improved on the basis of this molded line：Patent CN202926637 proposes a kind of dry vacuum pump and turned
Subtype line, is made up of, the position being connected in tooth root circular arc with circle involute 5 sections of curves, with the addition of one section of cycloid and is modified；Specially
Sharp CN103233894 proposes a kind of screw rotor molded line, is made up of 6 sections of curves, in addendum circle arc and circle involute and tooth root
The position that circular arc is connected with involute, the envelope that one section of circular arc and circular arc are with the addition of respectively is modified.
The profile for the screw rotor that above patent is proposed, is all by the circle involute and tooth on profile
Fair curve is added in the junction of root circular arc or addendum circle arc respectively, and improvement screw rotor space contact line is discontinuous, adjacent work
Make there is the problem of leaking between chamber；But addition fair curve can cause the constituent curve of screw rotor end face molded line more complicated,
Processing and the assembly precision of screw rotor are influenceed, while revised screw rotor still has longer space contact line, it is adjacent
Working chamber is not obvious by the improved leakage of space contact line.
The content of the invention
In order to solve the problem of existing single head concave tooth face Twin-screw vacuum pump has leakage, in order to solve existing molded line amendment
The problem of constituent curve of caused profile is more complicated, in order to enrich the species of Twin-screw vacuum pump rotor, the present invention
Propose a kind of asymmetric screw rotor：Including the first screw rotor (601) and the second screw rotor (602), two screw rods
The shape of rotor is different；The first end face molded line (401) of first screw rotor (601) is made up of 5 sections of curves：First off-centre operation is gradually
Burst at the seams AC, the first addendum circle arc CD, the first tip circular-arc DE, the equal space line EF of the first cycloid, the first tooth root circular arc FA, wherein the
It is smoothly connected between one tooth root circular arc FA and the first addendum circle arc CD by the first bias circle involute AC, the first addendum circle arc CD
And first cycloid equidistant curve EF between be smoothly connected by the first tip circular-arc DE；The second of second screw rotor (602)
Profile (402) is made up of 5 sections of curves：Envelope ac, the second addendum circle arc cd, the second crown of second eccentric circle involute
Circular arc de, the equidistant curve ef of the second cycloid, the second tooth root circular arc fa, wherein the second tooth root circular arc fa and the second addendum circle arc cd
Between be smoothly connected by the envelope ac of the second eccentric circle involute, the equidistant curve of the second addendum circle arc cd and the second cycloid
It is smoothly connected between ef by the second tip circular-arc de；On the profile of screw rotor, complete light between adjacent two sections of curves
Slip, while the profile of two screw rotors can be at a fully engaged in synchronous incorgruous dual AC power motion；Eliminate spiral shell
The region of stress concentration of bar rotor, improves the mechanical property of screw rotor, and two screw rotors have continuous and shorter space to connect
Touch line, be conducive to reducing between operated adjacent chamber by the leakage of space contact line, improve screw rotor final vacuum and
Rate of air sucked in required.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of asymmetric screw rotor, including the first screw rotor (601) and the second screw rotor (602), two spiral shells
The shape of bar rotor is different, parallel assembling and intermeshing；The shape and constituent curve of the profile of two screw rotors are not
It is identical, do that angular speed size is identical in two screw rotors, in the incorgruous dual AC power motion of synchronization in opposite direction, the first screw rod turns
The first eccentric circle involute AC, the first addendum circle arc CD, the first tip circular-arc on the first end face molded line (401) of sub (601)
DE, the equal space line EF of the first cycloid, the first tooth root circular arc FA, respectively with the second end face molded line of the second screw rotor (602)
(402) the envelope ac of the second eccentric circle involute on, the second tooth root circular arc fa, the equidistant curve ef of the second cycloid, second
Tip circular-arc de, the second addendum circle arc cd are intermeshed.
A kind of asymmetric screw rotor, the axis by profile along screw rotor, which is spinned, deploys generation；First spiral shell
The side of bar rotor (601) is made up of 5 flank of tooth, is followed successively by the first pitch face (1), the first crest top land (2), the First Transition flank of tooth
(3), the first concave tooth face (4), the first root face (5), this 5 flank of tooth are by the profile of the first screw rotor successively
One eccentric circle involute AC, the first addendum circle arc CD, the first tip circular-arc DE, the equal space line EF of the first cycloid, the first root circle
Axis of the arc FA along screw rotor spins what expansion was generated；Described the first pitch face (1) and the first crest top land (2) smooth company
Connect, the first crest top land (2) is smoothly connected with the First Transition flank of tooth (3), the First Transition flank of tooth (3) and the first concave tooth face (4) are smooth
Connection, the first concave tooth face (4) is smoothly connected with the first root face (5), the adjacent flank of tooth on the first screw rotor (601) side it
Between be all completely smooth connection；The side of second screw rotor (602) is made up of 5 flank of tooth, is followed successively by：Second pitch face (6),
Two root faces (7), the second concave tooth face (8), the second transition flank of tooth (9), the second crest top land (10), pair of each flank of tooth and profile
Answer production Methods identical with the first screw rotor (601), it is also all complete between the adjacent flank of tooth on the second screw rotor (602) side
It is smoothly connected entirely；When two screw rotors do synchronous incorgruous dual AC power motion, the at a fully engaged of the correspondence flank of tooth can be met, is not deposited
Interfering or having neither part nor lot in the part of engagement.
A kind of 8 geometric parameters on asymmetric screw rotor, profile：Addendum circle arc radius R1, pitch radius
R2, fillet radius R3, eccentric circle involute base radius Rb, tip circular-arc radius r, the circle of eccentric circle involute basic circle
Heart N and centre of gyration O1Apart from h, the center of circle N of eccentric circle involute basic circle phase angle [alpha], eccentric circle involute corner β it
Between meet below equation group：
4 geometric parameters on given profile：Addendum circle arc radius R1, fillet radius R3, eccentric circle involute
Base radius Rb, tip circular-arc radius r, substitute into above equation group be to obtain remaining 4 geometric parameters, so as to obtain end face
All geometric parameters on molded line.
A kind of each section of curve on asymmetric screw rotor, the first end face molded line (401) of the first screw rotor (601)
Determination mode it is as follows：
1. the first eccentric circle involute AC：
The parametric equation of standard circle involute is determined first：
Above-mentioned standard circle involute equation is subjected to coordinate transform twice, obtained to the first eccentric circle involute AC, i.e.,：
[xAC(t) yAC(t) 1]T=Μ2·M1·[x(t) y(t) 1]T
In formula：M1- rotation transformation,
M2- translation transformation,
The parametric equation that abbreviation obtains the first eccentric circle involute AC is：
2. the first addendum circle arc CD：
3. the first tip circular-arc DE：
In formula：(xM,yMThe tip circular-arc of)-first DE center of circle M coordinate；
Determine the first tip circular-arc DE center of circle M (xM,yM) coordinate, the following two equation groups of simultaneous first ask for intersection point
(x0,y0)：
x0 2+y0 2=(R1-r)2
By intersection point (x determined by above-mentioned equation0,y0), carry out after following rotation transformation, obtain the first tip circular-arc DE's
Center of circle M (xM,yM)：
In formula：θ-the anglec of rotation (i.e. straight line MO1With the acute angle folded by x-axis),
4. the equidistant curve EF of the first cycloid：
The parametric equation of one section of initial cycloid is determined first：
The distance of positive direction by the parametric equation of above-mentioned initial cycloid along normal, outwards equidistant r, is then revolved again
Transformation is changed, and obtains the equidistant curve EF of the first cycloid, i.e.,：
The parametric equation that abbreviation obtains the equidistant curve of the first cycloid is：
5. the first tooth root circular arc FA：
A kind of second tooth top on asymmetric screw rotor, the second end face molded line (402) of the second screw rotor (602)
Circular arc cd, the second tip circular-arc de, the equidistant curve ef of the second cycloid, the second tooth root circular arc fa, respectively by the first screw rotor
(601) the first addendum circle arc CD on first end face molded line (401), the first tip circular-arc DE, the equal space line EF of the first cycloid,
First tooth root circular arc FA, two centre of gyration point line O on profile1O2Midpoint carry out Central Symmetry draw；Second is inclined
The envelope ac of the heart circle involute formulas that shape really are as follows：
The first eccentric circle involute AC equation is subjected to following coordinate transform first：
In above formulaFor intermediate parameters into, the equation after coordinate transform is brought to following meshing condition：
Solve intermediate parametersWith independent variable t relation：
More than abbreviation various, the equation for obtaining the envelope ac of the second eccentric circle involute is：
In formula：- intermediate parameters, its value is determined by following formula：
Beneficial effects of the present invention are：
(1) on the profile of the screw rotor proposed, connection, whole end face are completely smooth between adjacent two sections of curves
Molded line is complete smooth, the complete smooth screw rotor of axis spiral expansion generation by profile along screw rotor, adjacent teeth
Connection is completely smooth between face, in the absence of region of stress concentration, the mechanical property of screw rotor is improved；
(2) connection tooth root circular arc of the profile of the screw rotor proposed directly with one section of eccentric circle involute smoothly
And addendum circle arc, it is not necessary to extra Modified cycloid or circular arc is added, the constituent curve of profile is less, and structure is simpler,
It is easy to fabrication design；
(3) screw rotor proposed is compared with existing single head concave tooth face screw rotor screw rotor, with shorter
Space contact line；It is smaller by the leakage of space contact line between two neighboring working chamber, and then improve Twin-screw vacuum pump
Sealing property, improve the final vacuum of Twin-screw vacuum pump.
Brief description of the drawings
Fig. 1 is existing single head concave tooth face screw rotor end face molded lines.
Fig. 2 is a kind of face type line chart of first screw rotor of asymmetric screw rotor.
Fig. 3 is a kind of face type line chart of second screw rotor of asymmetric screw rotor.
Fig. 4 is a kind of engagement figure of the profile of asymmetric screw rotor.
Fig. 5 is mesh schematic representation of the profile in different rotary angle of two screw rotors.
Fig. 6 is a kind of asymmetric screw rotor figure.
Fig. 7 is a kind of engagement figure of asymmetric screw rotor.
Fig. 8 is the space contact line schematic diagram on the first screw rotor.
In figure：
R1- addendum circle arc radius；R2- pitch radius；R3- fillet radius；RbThe basic circle of-bias circle involute
Radius；R-tip circular-arc radius；The center of circle N of α-bias circle involute basic circle phase angle；Turn of β-bias circle involute
Angle；θ-straight line MO1With the acute angle folded by x-axis；The angular velocity of rotation of screw rotor during ω-work；401-first end face type
Line；402-second end face molded line；601-the first screw rotor；602-the second screw rotor；1-the first pitch face；2-the
One crest top land；3-First Transition flank of tooth；4-the first concave tooth face；5-the first root face；6-the second pitch face；7-the second tooth
Root face；8-the second concave tooth face；9-the second transition flank of tooth；10-the second crest top land；11-the first concave tooth face contact line；12-the
One root face contact line；13-the first pitch face contact line；14-the first crest top land contact line；15-First Transition face
Line.
Embodiment
The present invention will be further described with example below in conjunction with the accompanying drawings.
The eccentric circle involute that the present invention is mentioned, refers to the first addendum circle arc CD, the first tooth root circular arc FA center of circle weight
Close, all centre of gyration point O in first end face molded line (401)1On, but the first eccentric circle involute AC basic circle center of circle N do not exist
The centre of gyration point O of profile1On；The profile that the present invention is mentioned, the use referred to one is perpendicular to screw rotor axis
Plane blocks screw rotor, the contour curve of section part screw rotor.
As shown in figure 1, being existing single head concave tooth face screw rotor end face molded lines, existing screw rotor end face molded line
Mainly it is made up of 4 sections of curves：Circle involute AB, addendum circle arc BC, cycloid CD, wherein tooth root circular arc DA, circle involute AB base
Circle and addendum circle arc BC, the center of circle of tooth root circular arc AD three are overlapped at O points, and circle involute AB and addendum circle arc BC are in tie point
Not only slip at B, circle involute AB and tooth root circular arc the DA not only slip at tie point A, while being deposited near tie point A
The part of engagement is not involved at one section, causes screw rotor space contact line discontinuous, there is obvious leakage path during work.
As shown in Fig. 2 being a kind of first end face molded lines of asymmetric screw rotor, it is made up of 5 sections of curves：First is inclined
Heart circle involute AC, the first addendum circle arc CD, the first tip circular-arc DE, the equal space line EF of the first cycloid, the first tooth root circular arc FA；
It is smoothly connected between wherein the first tooth root circular arc FA and the first addendum circle arc CD by the first bias circle involute AC, the first tooth top
It is smoothly connected between circular arc C D and the equidistant curve EF of the first cycloid by the first tip circular-arc DE；Whole first end face molded line
On, between adjacent two sections of curves between be completely smooth connection.
As shown in figure 3, being a kind of second end face molded lines of asymmetric screw rotor, it is made up of 5 sections of curves：Second is inclined
The envelope ac of heart circle involute, the second addendum circle arc cd, the second tip circular-arc de, the equidistant curve ef of the second cycloid, second
Tooth root circular arc fa；Pass through the envelope of the second eccentric circle involute between wherein the second tooth root circular arc fa and the second addendum circle arc cd
Ac is smoothly connected, and passes through the second smooth companies of tip circular-arc de between the second addendum circle arc cd and the equidistant curve ef of the second cycloid
Connect；On whole second end face molded line, connection is completely smooth between adjacent two sections of curves.
As shown in figure 4, being a kind of engagement figure of the profile of asymmetric screw rotor, the end face of two screw rotors
Molded line is rotating around respective centre of gyration point O1And O2Do that angular speed is equal in magnitude, the incorgruous dual AC power of the opposite synchronization in direction of rotation
Motion, wherein the first eccentric circle involute AC, the first tooth top on the first end face molded line (401) of the first screw rotor (601)
Circular arc C D, the first tip circular-arc DE, the equal space line EF of the first cycloid, the first tooth root circular arc FA, respectively with the second screw rotor
(602) envelope ac, the second tooth root circular arc fa, the second pendulum of the second eccentric circle involute on second end face molded line (402)
The equidistant curve ef of line, the second tip circular-arc de, the second addendum circle arc cd intermeshings.
As shown in figure 5, for two screw rotors profile in the mesh schematic representation of different rotary angle, (a) figure arrives
(b) 30 ° of figure first end face molded line (401) rotate counterclockwise, second end face molded line (402) turns clockwise 30 °；(b) figure is to (c)
30 ° of figure first end face molded line (401) rotate counterclockwise, second end face molded line (402) turns clockwise 30 °, and the rest may be inferred；
(a)~(e) in figure, the first bias circle involute AC on first end face molded line (401) and the on second end face molded line (402)
The envelope ac of two eccentric circle involutes is at a fully engaged；In (f) figure, the first cycloid on first end face molded line (401) etc.
It is at a fully engaged away from curve EF and the second tip circular-arc de on second end face molded line (402)；In (h) figure, first end face molded line
(401) the equidistant curve ef of the first tip circular-arc DE and the second cycloid on second end face molded line (402) on are at a fully engaged；
(i) in figure, the first addendum circle arc CD on first end face molded line (401) and the second root circle on second end face molded line (402)
Arc fa is at a fully engaged, it can be seen that, in the course of the work, the first eccentric circle involute AC on first end face molded line (401), the
One addendum circle arc CD, the first tip circular-arc DE, the equal space line EF of the first cycloid, the first tooth root circular arc FA, respectively with second end face
The envelope ac of the second eccentric circle involute on molded line (402), the second tooth root circular arc fa, the equidistant curve ef of the second cycloid,
Second tip circular-arc de, the second addendum circle arc cd are intermeshed.
As shown in fig. 6, being a kind of asymmetric screw rotor figure, the axis spiral by profile along screw rotor deploys
Generate, specific spiral expansion mode is：First end face molded line (401) is around revolution central point O1What is at the uniform velocity rotated counterclockwise is same
When, along centre of gyration point O excessively1And linear uniform motion is done perpendicular to the axis of profile, generate the first screw rotor
(601)；Second end face molded line (402) is around revolution central point O2While at the uniform velocity rotation clockwise, along centre of gyration point O excessively2And
Linear uniform motion, the second screw rotor of generation (602) are done perpendicular to the axis of profile；First screw rotor (601)
Side is made up of 5 flank of tooth, is followed successively by the first pitch face (1), the first crest top land (2), the First Transition flank of tooth (3), the first concave tooth
Face (4), the first root face (5), this 5 flank of tooth be successively by the first eccentric circle involute AC in first end face molded line (401),
The axle of first addendum circle arc CD, the first tip circular-arc DE, the equal space line EF of the first cycloid, the first tooth root circular arc FA around screw rotor
The expansion generation of line spiral；Described the first pitch face (1) is smoothly connected with the first crest top land (2), the first crest top land (2) and the
The one transition flank of tooth (3) is smoothly connected, and the First Transition flank of tooth (3) is smoothly connected with the first concave tooth face (4), the first concave tooth face (4) with
First root face (5) is smoothly connected；The side of second screw rotor (602) is made up of 5 flank of tooth, is followed successively by the second pitch face
(6), the second root face (7), the second concave tooth face (8), the second transition flank of tooth (9), the second crest top land (10), each flank of tooth and face type
The corresponding production Methods of line are similar with the first screw rotor (601), described the second pitch face (6) and the second root face (7) light
Slip, the second root face (7) is smoothly connected with the second concave tooth face (8), the second concave tooth face (8) and the second transition flank of tooth (9) light
Slip, the second transition flank of tooth is smoothly connected with the second crest top land (10)；The adjacent flank of tooth on two screw rotor sides is all complete
It is smoothly connected entirely.
As shown in fig. 7, being a kind of engagement figure of asymmetric screw rotor, in the course of the work, the first screw rotor
(601) the first pitch face (1), the first crest top land (2), the First Transition flank of tooth (3), the first concave tooth face (4) on side, first
Root face (5), respectively with the second pitch face (6) on the side of the second screw rotor (602), the second root face (7), second recessed
The flank of tooth (8), the second transition flank of tooth (9), the second crest top land (10) intermeshing；Synchronous incorgruous dual AC power is done in two screw rotors
During motion, the at a fully engaged of the correspondence flank of tooth can be met, in the absence of the part for interfering or having neither part nor lot in engagement.
As shown in figure 8, for the space contact line schematic diagram on the first screw rotor, space contact line refers to the first screw rod
Rotor (601) and the intersection of the second screw rotor (602) side at a fully engaged generation of upper two flank of tooth；Space contact line is in the cycle
Property change, be a working chamber between two adjacent groups space contact line, two working chambers of same group of space contact line both sides,
With different gas pressures；On first screw rotor (601), same group of space contact line is connect by 5 end to end spaces
Touch line composition：11-12-13-14-15, wherein the first concave tooth face contact line (11) is the first concave tooth face (4) and the second transition flank of tooth
(9) intersection, the first root face contact line (12) is the intersection of the first root face (5) and the second crest top land (10), the first helical teeth
Face contact line (13) is the intersection of the first pitch face (1) and the second pitch face (6), and the first crest top land contact line (14) is the first tooth
The intersection of top surface (2) and the second root face (7), First Transition face line (15) is that the First Transition flank of tooth (3) and second are recessed
The intersection of the flank of tooth (8)；Screw rotor proposed by the present invention, same group of space contact line is continuous and shorter, can effectively be hindered
Gas between two working chambers of disconnected both sides is improved between the level of Twin-screw vacuum pump by the leakage of space contact line
Sealing property, improves the final vacuum of Twin-screw vacuum pump.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, not to present invention protection model
The limitation 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 to pay various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (8)
1. a kind of asymmetric screw rotor, including the first screw rotor (601) and the second screw rotor (602), it is characterized in that：
First screw rotor (601) is different with the shape of the second screw rotor (602), the first end face type of the first screw rotor (601)
Line (401) is made up of 5 sections of curves：First eccentric circle involute AC, the first addendum circle arc CD, the first tip circular-arc DE, the first pendulum
Connection is completely smooth between the equal space line EF of line, the first tooth root circular arc FA, adjacent constituent curve；The first described off-centre operation is gradually opened
The line AC basic circle center of circle N and centre of gyration point O of first end face molded line (401)1It is misaligned；The of second screw rotor (602)
Biend molded line (402) is made up of 5 sections of curves：Envelope ac, the second addendum circle arc cd, the second tooth of second eccentric circle involute
Connection is also completely smooth between sharp circular arc de, the equidistant curve ef of the second cycloid, the second tooth root circular arc fa, adjacent constituent curve；
The shape and constituent curve of first end face molded line (401) and second end face molded line (402) are differed.
2. a kind of asymmetric screw rotor as claimed in claim 1, it is characterized in that：First screw rotor (601) and second
Screw rotor (602) can realize right-on engagement, in the absence of interfering or have neither part nor lot in engaging portion；Two screw rotors
Be the first eccentric circle involute AC on synchronous incorgruous dual AC power motion, first end face molded line (401), the first addendum circle arc CD,
First tip circular-arc DE, the equal space line EF of the first cycloid, the first tooth root circular arc FA, respectively with second end face molded line (402)
Envelope ac, the second tooth root circular arc fa, the equidistant curve ef of the second cycloid, the second tip circular-arc of second eccentric circle involute
De, the second addendum circle arc cd can realize right-on engagement.
3. a kind of asymmetric screw rotor as claimed in claim 1, it is characterized in that：8 on first end face molded line (401)
Geometric parameter：Addendum circle arc radius R1, pitch radius R2, fillet radius R3, eccentric circle involute base radius Rb, tooth
Sharp arc radius r, eccentric circle involute basic circle center of circle N and centre of gyration point O1Apart from h, the circle of eccentric circle involute basic circle
Following 4 equations are met between heart N phase angle [alpha], the corner β of eccentric circle involute：
4 geometric parameters on given profile：Addendum circle arc radius R1, fillet radius R3, eccentric circle involute base
Radius of circle Rb, tip circular-arc radius r, substitute into above equation group be to obtain remaining 4 geometric parameters, so as to obtain profile
Upper all geometric parameters.
4. a kind of asymmetric screw rotor as claimed in claim 1, it is characterized in that：The first of first screw rotor (601)
The parametric equation of each section of curve on profile (401) is as follows：
1. the first eccentric circle involute AC：
2. the first addendum circle arc CD：
3. the first tip circular-arc DE：
In formula：(xM,yMThe tip circular-arc of)-first DE center of circle M coordinate；
Determine the first tip circular-arc DE center of circle M (xM,yM) coordinate, the following two equation groups of simultaneous first ask for intersection point (x0,
y0)：
x0 2+y0 2=(R1-r)2
By intersection point determined by above-mentioned equation, carry out after following rotation transformation, obtain the first tip circular-arc DE center of circle M (xM,
yM)：
In formula：θ-straight line MO1With the acute angle folded by x-axis,
4. the equidistant curve EF of the first cycloid：
5. the first tooth root circular arc FA：
。
5. a kind of asymmetric screw rotor as claimed in claim 1, it is characterized in that：The second of second screw rotor (602)
The second addendum circle arc cd, the second tip circular-arc de, the equidistant curve ef of the second cycloid, the second tooth root on profile (402)
Circular arc fa, the first addendum circle arc CD, the first tip circular-arc on the first end face molded line (401) of the first screw rotor (601)
DE, the equal space line EF of the first cycloid, the first tooth root circular arc FA, two centre of gyration point line O on profile1O2Midpoint
Central Symmetry is carried out to draw；The envelope ac of second eccentric circle involute parametric equation is：
In above formulaFor intermediate parameters, its value is determined by following formula：
6. a kind of Twin-screw vacuum pump, it is characterized in that：Use a kind of asymmetric screw rotor as claimed in claim 1.
7. a kind of double-screw compressor, it is characterized in that：Use a kind of asymmetric screw rotor as claimed in claim 1.
8. a kind of twin-screw expander, it is characterized in that：Use a kind of asymmetric screw rotor as claimed in claim 1.
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| CN108050061A (en) * | 2018-01-09 | 2018-05-18 | 中国石油大学(华东) | A kind of efficient claw rotor |
| 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 |
| CN109555683A (en) * | 2019-01-18 | 2019-04-02 | 宁波领智机械科技有限公司 | A kind of impeller pump conveying solid-liquid double-phase |
| CN110360113A (en) * | 2019-07-18 | 2019-10-22 | 合肥工业大学 | A kind of double end symmetric rotor molded line based on the design of single-head screw molded lines of rotor |
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| CN110360113A (en) * | 2019-07-18 | 2019-10-22 | 合肥工业大学 | A kind of double end symmetric rotor molded line based on the design of single-head screw molded lines of rotor |
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