CN206448946U - A kind of conical screw rotor of self-balancing - Google Patents
A kind of conical screw rotor of self-balancing Download PDFInfo
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- CN206448946U CN206448946U CN201621334880.7U CN201621334880U CN206448946U CN 206448946 U CN206448946 U CN 206448946U CN 201621334880 U CN201621334880 U CN 201621334880U CN 206448946 U CN206448946 U CN 206448946U
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Abstract
The utility model discloses a kind of conical screw rotor of self-balancing, screw rotor is integrally conical, from suction end (I I) to exhaust end (VII VII), rotor outside circle arc radius R1It is gradually reduced, fillet radius R3Gradually increase；The addendum thickness δ of screw rotor1With thickness at root of tooth δ2Axially maintain constant；In any axial positions, section molded line is change, but the type of the constituent curve of section molded line is identical, and all including 12 curves, connection is completely smooth between adjacent curve；A kind of varying pitch conical screw rotor of the self-balancing proposed can be effectively increased suction end working chamber volume, reduce exhaust end working chamber volume, rotor is had larger internal volume ratio, and ensure that the interstage seal performance of exhaust end and the intensity of rotor；In any axial positions of screw rotor, the centre of form of section molded line is all on the centre of gyration line of screw rotor, and the dynamic balance performance of screw rotor is good.
Description
Technical field
The present invention relates to Twin-screw vacuum pump, more particularly to suitable for Twin-screw vacuum pump a kind of self-balancing taper spiral shell
Bar rotor.
Background technology
Twin-screw vacuum pump is a kind of positive-displacement vacuum pump, and because of its pumping chamber dry type oil-free, operate steadily reliable advantage,
It is widely used in petrochemical industry, food pharmaceutical, vacuum heat, nanometer manufacture, defense technology field；Twin-screw vacuum pump passes through
The incorgruous dual AC power motion of synchronization of two screw rotors, completes air-breathing, transport, compression and exhaust process of the gas in pump chamber；
The performance of screw rotor and its section molded line, interstage seal performance, mechanical property and the limit for directly affecting screw vacuum pump is true
Reciprocal of duty cycle.
Single head conical screw rotor disclosed in patent CN101351646, suction end external diameter is big, and exhaust end external diameter is small, work
When there is interior compression process；The transverse tooth thickness changing rule of the screw rotor is：Addendum thickness close to suction end is larger, occupies one
Part aspirated volume, influences rate of air sucked in required, higher close to exhaust end gas pressure, but addendum thickness is smaller, it is impossible to effectively stop high
Leaked between the level that body of calming the anger passes through crest top land；While the screw rotor, the centre of form of its axial cross section is not in the revolution of screw rotor
On center line, the normal engagement of eccentric force influence is also easy to produce.
The content of the invention
There is eccentric force, section molded line in order to solve the screw rotor in above-mentioned document to there is cusp, suction end tooth top thick
The problem of leaking larger between the larger occupancy aspirated volume of degree, the smaller level for passing the gas through crest top land of exhaust end addendum thickness, be
The species of abundant screw rotor, the present invention proposes a kind of conical screw rotor of self-balancing；Screw rotor is tapered, from air-breathing
(I-I) is held to arrive exhaust end (VII-VII), the section molded line of screw rotor is change；The helical pitch P of screw rotor is axially maintained not
Become, by controlling the central angle alpha of screw rotor addendum circle arc, make the addendum thickness δ of screw rotor1With thickness at root of tooth δ2All the time not
Become and equal, thus there can be aspirated volume of the increase screw rotor in suction end (I-I), effect stop screw rod rotor is in exhaust end
Leaked between the level that gas passes through crest top land between (VII-VII) two, place operated adjacent chamber, while increasing screw rotor in exhaust end
The intensity at (VII-VII) place, Reducing distortion；The section molded line that screw rotor is used is smooth and can realize and correctly nibble
Close, eliminate the harmful effect of rough tie point, improve the force-bearing situation of screw rotor；The screw rotor proposed is any
Axial positions, its section molded line is S-shaped, and the centre of form of section molded line turns screw rod all on the centre of gyration line of screw rotor
Son has good dynamic balance performance；The screw rotor proposed, can increase suction end working chamber volume, reduce exhaust end
Interior volume specific ratio in working chamber volume, the increase course of work, improves the pumping speed and final vacuum of Twin-screw vacuum pump.
To achieve these goals, the present invention is adopted the following technical scheme that：
The conical screw rotor of a kind of self-balancing proposed by the present invention, from suction end (I-I) to exhaust end (VII-VII), spiral shell
Bar rotor is tapered, and screw rotor is complete smooth, in the absence of rough place；The helical pitch P of screw rotor is axially maintained not
Become；The addendum thickness δ of screw rotor1With thickness at root of tooth δ2All the time it is constant and equal, i.e. δ1=δ2；In any axial positions, spiral shell
The section molded line of bar rotor be S-shaped, and section molded line the centre of form on the centre of gyration line of screw rotor.
A kind of conical screw rotor of self-balancing, in any axial positions, the section molded line of screw rotor is different from,
Change, but on the molded line of section each section of constituent curve type it is identical with quantity, totally 12 sections of curves, including：First outside circle
Arc AB, the first tip circular-arc BC, the equidistant curve CD of the first cycloid, the first tooth root circular arc DE, the envelope of the first connection circular arc
EF, the first connection circular arc FG, the second addendum circle arc GH, the second tip circular-arc HI, the equidistant curve IJ of the second cycloid, the second tooth root
Circular arc JK, the envelope KL of the second connection circular arc, the second connection circular arc LA；All it is to be completely smooth connection between adjacent two sections of curves
, rough tie point is not present on the molded line of section；The first addendum circle arc AB, the first tip circular-arc BC on the molded line of section,
The equidistant curve CD of one cycloid, the second tooth root circular arc JK, the envelope KL of the second connection circular arc, the second connection circular arc LA, respectively
It is connected with the second addendum circle arc GH, the second tip circular-arc HI, the equidistant curve IJ of the second cycloid, the first tooth root circular arc DE, first
The envelope EF of circular arc, the first connection circular arc FG are centrosymmetric on centre of gyration point O.
A kind of conical screw rotor of self-balancing, in the course of the work, left-hand screw rotor (301) and right-hand screw rotor
(302) in synchronous incorgruous dual AC power motion, right-on engagement can be realized；In any axial positions, left-handed screw
The left-handed section molded line (201) of rotor (301) is identical with the dextrorotation section molded line (202) of right-hand screw rotor (302), only
It is that phase is different；The first addendum circle arc AB, the first crown circle on the left-handed section molded line (201) of left-hand screw rotor (301)
Arc BC, the equidistant curve CD of the first cycloid, the second tooth root circular arc JK, the envelope KL of the second connection circular arc, the second connection circular arc
LA, respectively with the second tooth root circular arc jk on the dextrorotation section molded line (202) of right-hand screw rotor (302), the second cycloid etc.
The envelope ef of circular arc is connected away from curve ij, the second tip circular-arc hi, the second addendum circle arc gh, the second connection circular arc fg, second
Correct engagement can be realized.
A kind of conical screw rotor of self-balancing, left-hand screw rotor (301) is by left-handed section molded line (201) from suction end
(I-I) deploys to exhaust end (VII-VII) along left-handed twist, and right-hand screw rotor (302) is by dextrorotation section molded line (202) from suction
Deploy to exhaust end (VII-VII) along right-hand helix at gas end (I-I)；With flat where the centre of gyration line of screw rotor and suction end
The intersection point in face is the origin of coordinates, using centre of gyration line as z-axis, sets up three-dimensional coordinate system, helix equation is：
Left-handed twist：
Right-hand helix：
In formula：τ-spiral angle of spread, rad；R-helix base radius, mm；N-screw rod helical pitch number；P-screw rotor
Helical pitch；
While the section molded line of screw rotor deploys along helix, in any axial positions, the tooth of section molded line
Tip circle arc radius R1, fillet radius R3, addendum circle arc central angle alpha also change with spiral angle of spread τ change, its advise
Restrain and be：
Addendum circle arc radius：
Fillet radius：
The central angle of addendum circle arc：
In formula：Rs1、Rd1- respectively in the addendum circle arc radius at suction end (I-I) and exhaust end (VII-VII) place；Rs3、
Rd3- respectively in the fillet radius at suction end (I-I) and exhaust end (VII-VII) place；αs- at suction end (I-I) place
The central angle of addendum circle arc.
5th, the conical screw rotor of a kind of self-balancing as claimed in claim 1, it is characterized in that：Left-hand screw rotor
(301) each curvilinear equation on left-handed section molded line (201) is as follows：
1. the first addendum circle arc AB equation is：
2. the first tip circular-arc BC equation is：
In formula：R-tip circular-arc radius；(xM,yMThe centre point M of)-tip circular-arc coordinate；
Determine the centre point M (x of tip circular-arcM,yM) coordinate, the following two equations of simultaneous first obtain intersection point：
By intersection point determined by above-mentioned equation, turned clockwise β angles around revolution central point O, crown centre point M can be obtained
(xM,yM)；Wherein
3. the equidistant curve CD of the first cycloid determination mode is：
First one section of curve is determined by following equations：
By curve determined by above-mentioned equation, turned clockwise β angles around revolution central point O, can obtain the first cycloid etc.
Away from curve CD；
4. the second tooth root circular arc JK equation is：
5. the envelope KL of the second connection circular arc determination mode is：
First one section of curve is determined by following equations：
By initial curve determined by above-mentioned equation, turned clockwise α angles around revolution central point O, the second connection can be obtained
The envelope KL, α of circular arc are the central angle of addendum circle arc；
6. the second connection circular arc LA equation is：
In formula：Lp- the second connection circular arc LA centre point N is determined apart from centre of gyration point O length by below equation：
Beneficial effects of the present invention are：
1. a kind of conical screw rotor of the self-balancing proposed, screw rotor is tapered, from the suction end of screw rotor
(I-I) addendum circle arc radius R on exhaust end (VII-VII), section molded line is arrived1It is gradually reduced, fillet radius R3Gradually increase,
The working chamber volume of suction end can fully be increased, reduce the working chamber volume of exhaust end, rotor is had larger internal volume ratio, improved
The pumping speed of Twin-screw vacuum pump；
2. the addendum thickness δ of screw rotor1With thickness at root of tooth δ2Axially maintain constant and equal, i.e. δ1=δ2, Ke Yijin
One step increases suction end working chamber volume, effectively stops leakage between the level for passing through crest top land close to gas at exhaust end, and ensure
The on high-tension side intensity of screw rotor, reduces deformation during work；
3. the section molded line of screw rotor, the equidistant curve and addendum circle arc of cycloid, spiral shell are connected using one section of tip circular-arc
Bar rotor is complete smooth and can realize correct engagement, while eliminating the region of stress concentration of rough tie point, improves spiral shell
The force-bearing situation of bar rotor, and the leakage aggravation for preventing cusp abrasion from causing；
4. in any axial positions, the section molded line of screw rotor is S-shaped, and the centre of form of section molded line is in screw rotor
On centre of gyration line, i.e., screw rotor has good dynamic balance performance.
Brief description of the drawings
Fig. 1 is the section molded lines of the conical screw rotor of self-balancing.
Fig. 2 is the engagement figure of the section molded line of two screw rotors.
Fig. 3 is the conical screw rotor figure of self-balancing.
The engagement figure of the conical screw rotor of two self-balancings when Fig. 4 is work.
Fig. 5 is the section molded line engagement figure in any two screw rotors of axial positions.
In figure：R1、R2、R3- be respectively section molded line on addendum circle arc radius, pitch radius, fillet radius, three
The length relation of person is：2R2=R1+R3；The central angle of α-addendum circle arc；The centre point M of β-tip circular-arc is relative to x-axis
Phase angle；δ1The addendum thickness of-screw rotor；δ2The thickness at root of tooth of-screw rotor；The helical pitch of P-screw rotor；301-left
Revolve screw rotor；302-right-hand screw rotor；The left-handed section molded line of 201-left-hand screw rotor；202-right handed screw turns
The dextrorotation section molded line of son；The centre of gyration point of point O, o-respectively two screw rotor section molded line, the axis difference at place
For the centre of gyration line of two screw rotors.
Embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, the section molded lines of the conical screw rotor for self-balancing；The section molded line of screw rotor refers to：
With a plane perpendicular to screw rotor centre of gyration line, screw rotor is blocked from any axial positions, section part is obtained
Contour curve；The section molded line of screw rotor is surrounded by 12 sections of curves, is followed successively by clockwise：First addendum circle arc AB, first
Tip circular-arc BC, the equidistant curve CD of the first cycloid, the first tooth root circular arc DE, the envelope EF of the first connection circular arc, first connect
Connect circular arc FG, the second addendum circle arc GH, the second tip circular-arc HI, the equidistant curve IJ of the second cycloid, the second tooth root circular arc JK,
The envelope KL of two connection circular arcs, the second connection circular arc LA；It is smoothly connected between adjacent curve, the section type of whole screw rotor
Rough tie point is not present on line；Whole cross section molded line is the first addendum circle arc on S-shaped and Central Symmetry, section molded line
AB, the first tip circular-arc BC, the equidistant curve CD of the first cycloid, the second tooth root circular arc JK, second connection circular arc envelope KL,
Second connection circular arc LA, respectively with the second addendum circle arc GH, the second tip circular-arc HI, the equidistant curve IJ of the second cycloid, first
Tooth root circular arc DE, the envelope EF of the first connection circular arc, the first connection circular arc FG are centrosymmetric on centre of gyration point O.
As shown in Fig. 2 the engagement figure of the section molded line for two screw rotors；In same axial positions, two screw rods
The section molded line of rotor is identical, and simply phase is different；The first addendum circle arc AB in left-handed section molded line (201), first
Tip circular-arc BC, the equidistant curve CD of the first cycloid, the first tooth root circular arc DE, the envelope EF of the first connection circular arc, first connect
Circular arc FG is met, respectively with the second tooth root circular arc jk in dextrorotation section molded line (202), the equidistant curve ij of the second cycloid, second
Tip circular-arc hi, the second addendum circle arc gh, the second connection circular arc fg, the envelope ef of the second connection circular arc can be realized correctly
Engagement.
As shown in figure 3, being the conical screw rotor figure of self-balancing；I-I and VII-VII represents screw rotor air-breathing respectively in figure
End axial location corresponding with exhaust end；Left-hand screw rotor (301) from left-handed section molded line (201) from suction end (I-I) to
Exhaust end (VII-VII) deploys along left-handed twist, right-hand screw rotor (302) by dextrorotation section molded line (202) from suction end (I-
I) deploy to exhaust end (VII-VII) along right-hand helix；While spiral deploys, the addendum circle arc radius R on the molded line of section1
It is gradually reduced, fillet radius R3Gradually increase, make the global shape of screw rotor tapered；Helix is left-handed and dextrorotation
It is defined as：Point to dynamic point on exhaust extreme direction, helix by suction end with left hand thumb is along remaining four sensings rising referred to
It is left-handed；Dynamic point on exhaust extreme direction, helix is pointed to by suction end with hand thumb and rises the as right side along remaining four sensing referred to
Rotation.
As shown in figure 4, during for work the conical screw rotor of two self-balancings engagement figure；The helical pitch P edges of screw rotor
Axially retain constant, addendum thickness δ1With thickness at root of tooth δ2Axially maintain constant and equal, i.e. δ1=δ2；On section molded line edge
During helix expansion generation rotor, spiral angle of spread τ value takes 0,π, 2 π, 3 π, during 4 π, corresponding axle
Represented respectively with I-I, II-II, III-III, IV-IV, V-V, VI-VI, VII-VII to position.
As shown in figure 5, in the section molded line engagement figure of any two screw rotors of axial positions；Fig. 5 (a), (b),
(c), (d), (e), (f), (g) are corresponded in axial location I-I, II-II, III-III, IV-IV, V-V, VI-VI, VII-VII respectively
Place, the instantaneous engagement figure of two screw rotor section molded line；It can be seen that the section molded line in any two screw rods of axial positions is
At a fully engaged, it can be said that bright two screw rotors are intermeshing on the whole；At axially different position, section type
The Major Variation of line is：From suction end (I-I) to exhaust end (VII-VII), the addendum circle arc half of rotor axial section molded line
Footpath R1It is gradually reduced, fillet radius R3Gradually increase；Thus the two mutual at a fully engaged screw rotors generated, by inhaling
Exhaust end (VII-VII) is arrived at gas end (I-I), and working chamber volume is gradually reduced, and screw rotor is there is interior compression process.
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 conical screw rotor of self-balancing, it is characterized in that：Screw rotor is tapered, from suction end (I-I) to exhaust end
(VII-VII), the addendum circle arc radius R of screw rotor1It is gradually reduced, fillet radius R3Gradually increase, and screw rotor is complete
Smooth, in the absence of rough place；The helical pitch P of screw rotor axially maintains constant；Addendum thickness δ1With thickness at root of tooth δ2Along axle
To constant and equal, the i.e. δ of holding1=δ2；In any axial positions, the section molded line of screw rotor is S-shaped, and section molded line
The centre of form all on the centre of gyration line of screw rotor.
2. a kind of conical screw rotor of self-balancing as claimed in claim 1, it is characterized in that：In any axial positions, spiral shell
The section molded line of bar rotor is different from, be change, but on the molded line of section each section of constituent curve type it is identical with quantity, altogether
12 sections of curves, including：First addendum circle arc AB, the first tip circular-arc BC, the equidistant curve CD of the first cycloid, the first tooth root circular arc
DE, the envelope EF of the first connection circular arc, the first connection circular arc FG, the second addendum circle arc GH, the second tip circular-arc HI, the second pendulum
The equidistant curve IJ of line, the second tooth root circular arc JK, the envelope KL of the second connection circular arc, the second connection circular arc LA；Adjacent two sections
All it is completely smooth between curve on connection, section molded line and rough tie point is not present；The first tooth top on the molded line of section
Circular arc AB, the first tip circular-arc BC, the equidistant curve CD of the first cycloid, the second tooth root circular arc JK, the envelope of the second connection circular arc
Line KL, second connection circular arc LA, respectively with the second addendum circle arc GH, the second tip circular-arc HI, the equidistant curve IJ of the second cycloid,
First tooth root circular arc DE, the envelope EF of the first connection circular arc, the first connection circular arc FG are in center pair on centre of gyration point O
Claim.
3. a kind of conical screw rotor of self-balancing as claimed in claim 1, it is characterized in that：In the course of the work, left-handed spiral shell
Bar rotor (301) and right-hand screw rotor (302) can realize right-on engagement in synchronous incorgruous dual AC power motion；
In any axial positions, the left-handed section molded line (201) of left-hand screw rotor (301) and the right side of right-hand screw rotor (302)
Revolve section molded line (202) identical；The first addendum circle arc on the left-handed section molded line (201) of left-hand screw rotor (301)
AB, the first tip circular-arc BC, the equidistant curve CD of the first cycloid, the second tooth root circular arc JK, second connection circular arc envelope KL,
Second connection circular arc LA, respectively with the second tooth root circular arc jk on the dextrorotation section molded line (202) of right-hand screw rotor (302),
The equidistant curve ij of second cycloid, the second tip circular-arc hi, the second addendum circle arc gh, the second connection circular arc fg, the second connection circle
The envelope ef of arc can realize correct engagement.
4. a kind of conical screw rotor of self-balancing as claimed in claim 1, it is characterized in that：Left-hand screw rotor (301) by
Left-handed section molded line (201) is deployed, right-hand screw rotor from suction end (I-I) to exhaust end (VII-VII) along left-handed twist
(302) deployed by dextrorotation section molded line (202) from suction end (I-I) to exhaust end (VII-VII) along right-hand helix；Turned with screw rod
The intersection point of plane is the origin of coordinates where the centre of gyration line and suction end of son, using centre of gyration line as z-axis, sets up three dimensions
Coordinate system, helix equation is：
Left-handed twist：
Right-hand helix：
In formula：τ-spiral angle of spread, rad；R-helix base radius, mm；N-screw rod helical pitch number；P-screw rotor is led
Journey；
While the section molded line of screw rotor deploys along helix, in any axial positions, the section type of screw rotor
The addendum circle arc R of line1, fillet radius R3, addendum circle arc central angle alpha also change with spiral angle of spread τ change, its
Rule is：
Addendum circle arc radius：
Fillet radius：
The central angle of addendum circle arc：
In formula：Rs1、Rd1- respectively in the addendum circle arc radius at suction end (I-I) and exhaust end (VII-VII) place；Rs3、Rd3- point
Not Wei suction end (I-I) and exhaust end (VII-VII) place fillet radius；αs- the outside circle at suction end (I-I) place
The central angle of arc.
5. a kind of conical screw rotor of self-balancing as claimed in claim 1, it is characterized in that：Left-hand screw rotor (301)
Each curvilinear equation on left-handed section molded line (201) is as follows：
1. the first addendum circle arc AB equation is：
2. the first tip circular-arc BC equation is：
In formula：R-tip circular-arc radius；(xM,yMThe centre point M of)-tip circular-arc coordinate；
Determine the centre point M (x of tip circular-arcM,yM) coordinate, the following two equations of simultaneous first obtain intersection point：
By intersection point determined by above-mentioned equation, turned clockwise β angles around revolution central point O, obtain crown centre point M (xM,
yM)；Wherein
3. the equidistant curve CD of the first cycloid determination mode is：
First one section of curve is determined by following equations：
By curve determined by above-mentioned equation, turned clockwise β angles around revolution central point O, obtain the equidistant song of the first cycloid
Line CD；
4. the second tooth root circular arc JK equation is：
5. the envelope KL of the second connection circular arc determination mode is：
First one section of curve is determined by following equations：
By initial curve determined by above-mentioned equation, turned clockwise α angles around revolution central point O, obtain the second connection circular arc
Envelope KL, α is the central angle of addendum circle arc；
6. the second connection circular arc LA equation is：
In formula：Lp- the second connection circular arc LA centre point N is determined apart from centre of gyration point O length by below equation：
6. a kind of Twin-screw vacuum pump, it is characterized in that：Use the complete smooth twin-screw of self-balancing type taper as claimed in claim 1
Rotor.
7. a kind of double-screw compressor, it is characterized in that：Turned using the varying pitch conical screw of self-balancing as claimed in claim 1
Son.
8. a kind of twin-screw expander, it is characterized in that：Turned using the varying pitch conical screw of self-balancing as claimed in claim 1
Son.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621334880.7U CN206448946U (en) | 2016-12-07 | 2016-12-07 | A kind of conical screw rotor of self-balancing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621334880.7U CN206448946U (en) | 2016-12-07 | 2016-12-07 | A kind of conical screw rotor of self-balancing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206448946U true CN206448946U (en) | 2017-08-29 |
Family
ID=59662706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621334880.7U Withdrawn - After Issue CN206448946U (en) | 2016-12-07 | 2016-12-07 | A kind of conical screw rotor of self-balancing |
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| Country | Link |
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| CN (1) | CN206448946U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438358A (en) * | 2016-12-07 | 2017-02-22 | 中国石油大学(华东) | Self-balancing conical screw rotor |
| CN109458226A (en) * | 2018-12-25 | 2019-03-12 | 中国石油大学(华东) | A kind of variable cross-section screw rotor of twin-screw expander |
| CN111927775A (en) * | 2020-06-24 | 2020-11-13 | 合肥工业大学 | Method for reducing unbalance amount of screw rotor through stretching and thickening |
| CN112610474A (en) * | 2020-12-22 | 2021-04-06 | 金迈思液压设备（天津）有限公司 | Conical rotor double-screw pump with bilateral exhaust |
| CN118188486A (en) * | 2024-03-29 | 2024-06-14 | 杭州久铮技术有限公司 | Double-head symmetrical variable-diameter variable-pitch screw vacuum pump rotor and operation method thereof |
-
2016
- 2016-12-07 CN CN201621334880.7U patent/CN206448946U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438358A (en) * | 2016-12-07 | 2017-02-22 | 中国石油大学(华东) | Self-balancing conical screw rotor |
| CN106438358B (en) * | 2016-12-07 | 2018-06-05 | 中国石油大学(华东) | A kind of conical screw rotor of self-balancing |
| CN109458226A (en) * | 2018-12-25 | 2019-03-12 | 中国石油大学(华东) | A kind of variable cross-section screw rotor of twin-screw expander |
| CN111927775A (en) * | 2020-06-24 | 2020-11-13 | 合肥工业大学 | Method for reducing unbalance amount of screw rotor through stretching and thickening |
| CN111927775B (en) * | 2020-06-24 | 2022-02-15 | 合肥工业大学 | Method for reducing unbalance amount of screw rotor through stretching and thickening |
| CN112610474A (en) * | 2020-12-22 | 2021-04-06 | 金迈思液压设备（天津）有限公司 | Conical rotor double-screw pump with bilateral exhaust |
| CN118188486A (en) * | 2024-03-29 | 2024-06-14 | 杭州久铮技术有限公司 | Double-head symmetrical variable-diameter variable-pitch screw vacuum pump rotor and operation method thereof |
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