CN110360113B - Double-end symmetrical rotor profile based on single-end screw rotor profile design - Google Patents
Double-end symmetrical rotor profile based on single-end screw rotor profile design Download PDFInfo
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- CN110360113B CN110360113B CN201910649576.3A CN201910649576A CN110360113B CN 110360113 B CN110360113 B CN 110360113B CN 201910649576 A CN201910649576 A CN 201910649576A CN 110360113 B CN110360113 B CN 110360113B
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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
- 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
- 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
- F04C2240/00—Components
- F04C2240/20—Rotors
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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
- F04C2250/00—Geometry
- F04C2250/20—Geometry of the rotor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention discloses a double-head symmetrical rotor profile designed based on a single-head screw rotor profile, which consists of a first profile and a second profile which are centrosymmetric, wherein the first profile comprises a first tooth curve A 'B', a first tooth root circle B 'C', a first compound tooth curve C 'G' and a first tooth top circle G 'A', the position and the shape of the first tooth curve A 'B' are the same as those of a tooth curve AB of the single-head screw rotor profile, the first compound tooth curve C 'G' is obtained by clockwise rotating a compound tooth curve CG90 degrees of the single-head screw rotor profile, and the rotating center is the circle center of the tooth root circle BC; and obtaining a first tooth root circle B ' C ' by using the circular arc connecting points B ' and C ', obtaining a central symmetry point A ' of the point A by using the circle center of the tooth root circle BC as a symmetry center, and obtaining a first tooth crest circle G ' A ' by using the circular arc connecting points G ' and A '. Compared with the prior art, the invention has the following advantages: the problems of dynamic unbalance, noise and vibration are overcome on the basis of inheriting the advantages of the original single-head screw rotor profile.
Description
Technical Field
The invention relates to the field of screw vacuum pumps, in particular to a double-head symmetrical rotor profile designed based on a single-head screw rotor profile.
Background
The screw rotor is the core component of the screw vacuum pump, and the rotor profile directly affects the performance of the screw vacuum pump. Various single-end rotor molded lines are well researched at present, but due to the asymmetry, the problem of dynamic unbalance of the whole rotor is caused. The invention provides a method for transforming a single-head screw rotor profile into a double-head symmetrical rotor profile on the basis of the research on the single-head screw rotor profiles at home and abroad at present, and various advantages of the original single-head profile are reserved by rearranging the tooth curves of the single-head rotor profile, so that the problem of dynamic unbalance of the single-head rotor profile is solved theoretically.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a double-head symmetrical rotor profile designed based on a single-head screw rotor profile.
The invention is realized by the following technical scheme: the utility model provides a double-end symmetrical rotor molded lines based on single-end screw rotor molded lines design, single-end screw rotor molded lines include tooth curve AB, dedendum circle BC, compound tooth curve CG and addendum circle GA, two points that the arbitrary radius circumference of using the centre of a circle of dedendum circle BC as the centre of a circle intersects on tooth curve AB and compound tooth curve CG are greater than 90 degrees to the opening angle of centre of a circle, the molded lines of two screw rotors that single-end screw rotor molded lines used are the same completely, and in the rotatory in-process of a week of screw rotor, the meshing point that corresponds on two screw rotors only meshes once, its characterized in that: the double-end symmetrical rotor profile consists of a first profile and a second profile, the first profile comprises a first tooth curve A 'B', a first tooth root circle B 'C', a first compound tooth curve C 'G' and a first tooth top circle G 'A', the position and the shape of the first tooth curve A 'B' are the same as those of a tooth curve AB of the single-end screw rotor profile, the first compound tooth curve C 'G' is obtained by clockwise rotating a compound tooth curve CG90 degrees of the single-end screw rotor profile, and the rotating center is the circle center of the tooth root circle BC; drawing circular arc connection points B ' and C ' by using the radius and the circle of a tooth root circle BC to obtain a first tooth root circle B ' C ', obtaining a central symmetry point A ' of the point A by using the circle center of the tooth root circle BC as a symmetry center, and drawing circular arc connection points G ' and A ' by using the radius and the circle of an addendum circle GA to obtain a first addendum circle G ' A '; the second molded line and the first molded line are in central symmetry, and the center of symmetry is the center of a tooth root circle BC.
As a further improvement to the above solution, the tooth curve AB is a prolate epicycloid.
As a further improvement to the scheme, the compound tooth curve CG is one or more of an Archimedes spiral and an envelope line thereof, a latch line and an envelope line thereof and an arc and an envelope line thereof
As a further improvement to the above solution, the composite tooth curve CG includes a transition circle CD, a hypocycloid DE, an epicycloid EF, and a transition circle FG, and the first composite tooth curve C 'G' includes a first transition circle C 'D', a first hypocycloid D 'E', a first epicycloid E 'F', and a first transition circle F 'G', the first transition circle C 'D', a first hypocycloid D 'E', a first epicycloid E 'F', and a first transition circle F 'G' are obtained by clockwise rotating the transition circle CD, the hypocycloid DE, the epicycloid EF, and the transition circle FG 90 ° of the single-headed screw rotor profile, with the center of rotation being the center of the root circle BC.
Compared with the prior art, the invention has the following advantages: the double-end symmetrical rotor profile designed based on the single-end screw rotor profile obtained by the scheme can inherit the advantages of the original single-end screw rotor profile, overcomes the problem of dynamic unbalance and reduces the problems of noise and vibration; the screw rotor meshing structure can be applied to a pair of screw rotors, the molded lines of the end faces of the two rotors are completely the same, and the meshing relationship can be formed only by adopting left rotation and right rotation respectively; the screw vacuum pump with the double-head symmetrical rotor profile can be widely applied to the fields of electronics, semiconductors, chemical industry, food, aerospace and the like.
Drawings
Fig. 1 is a schematic view of a single-ended screw rotor profile.
Fig. 2 is a schematic view of a double-ended symmetrical rotor profile based on a single-ended screw rotor profile design according to the present invention.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
A double-head symmetrical rotor profile designed based on a single-head screw rotor profile comprises a tooth curve AB, a tooth root circle BC, a compound tooth curve CG and a tooth top circle GA, wherein the opening angle of two points, which are intersected on the tooth curve AB and the compound tooth curve CG, of an arbitrary radius circumference taking the circle center of the tooth root circle BC as the circle center is larger than 90 degrees to the circle center, the profiles of two screw rotors applied to the single-head screw rotor profile are completely identical, in the process that the screw rotors rotate for one circle, corresponding meshing points on the two screw rotors are meshed only once, the double-head symmetrical rotor profile is composed of a first profile and a second profile, the first profile comprises a first tooth curve A 'B', a first tooth root circle B 'C', a first compound tooth curve C 'G' and a first tooth top circle G 'A', the first tooth curve A 'B' is identical to the tooth curve AB of the single-head screw rotor profile in position and shape, the first compound tooth curve C 'G' is obtained by clockwise rotating the compound tooth curve CG90 degrees of the single-head screw rotor profile, and the rotating center is the center of a tooth root circle BC; drawing circular arc connection points B ' and C ' by using the radius and the circle of a tooth root circle BC to obtain a first tooth root circle B ' C ', obtaining a central symmetry point A ' of the point A by using the circle center of the tooth root circle BC as a symmetry center, and drawing circular arc connection points G ' and A ' by using the radius and the circle of an addendum circle GA to obtain a first addendum circle G ' A '; the second molded line and the first molded line are in central symmetry, and the center of symmetry is the center of a tooth root circle BC. The tooth curve AB is a long-amplitude epicycloid, and the composite tooth curve CG can be one or more of an Archimedes spiral and an envelope curve thereof, a latch line and an envelope curve thereof, and an arc and an envelope curve thereof.
The compound tooth curve CG comprises a transition circle CD, a hypocycloid DE, an epicycloid EF and a transition circle FG, the first compound tooth curve C 'G' comprises a first transition circle C 'D', a first hypocycloid D 'E', a first epicycloid E 'F' and a first transition circle F 'G', the first transition circle C 'D', the first hypocycloid D 'E', the first epicycloid E 'F' and the first transition circle F 'G' are obtained by clockwise rotating the transition circle CD, the hypocycloid DE, the epicycloid EF and the transition circle FG by 90 degrees of a single-end screw rotor molded line, and the rotation center is the circle center of the tooth root circle BC.
The profile of the single-head screw rotor serving as a design basis should meet the following conditions, and the profiles of the two screw rotors are completely the same, which is required: the tooth curves formed by the rotor profiles must correspond pairwise or can be meshed automatically; the corresponding two sections of tooth curves must satisfy the conjugate curve relationship; the central angle degrees occupied by the corresponding two sections of tooth curves are equal; one pair of tooth curves appears in the form of an addendum circle and a dedendum circle, and the rest tooth curves are divided into two parts which are not adjacent by the addendum circle and the dedendum circle inevitably, and are connected end to form two curves which are used as transition curves between the addendum circle and the dedendum circle; any point on the tooth curve can only mesh with a corresponding point on the other rotor once in the process of one rotation of the rotors.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The utility model provides a double-end symmetrical rotor molded lines based on single-end screw rotor molded lines design, single-end screw rotor molded lines include tooth curve AB, dedendum circle BC, compound tooth curve CG and addendum circle GA, two points that the arbitrary radius circumference of using the centre of a circle of dedendum circle BC as the centre of a circle intersects on tooth curve AB and compound tooth curve CG are greater than 90 degrees to the opening angle of centre of a circle, the molded lines of two screw rotors that single-end screw rotor molded lines used are the same completely, and in the rotatory in-process of a week of screw rotor, the meshing point that corresponds on two screw rotors only meshes once, its characterized in that: the double-end symmetrical rotor profile consists of a first profile and a second profile, the first profile comprises a first tooth curve A 'B', a first tooth root circle B 'C', a first compound tooth curve C 'G' and a first tooth top circle G 'A', the position and the shape of the first tooth curve A 'B' are the same as those of a tooth curve AB of the single-end screw rotor profile, the first compound tooth curve C 'G' is obtained by clockwise rotating the compound tooth curve CG90 degrees of the single-end screw rotor profile, and the rotating center is the circle center of the tooth root circle BC; drawing circular arc connection points B ' and C ' by using the radius and the circle of a tooth root circle BC to obtain a first tooth root circle B ' C ', obtaining a central symmetry point A ' of the point A by using the circle center of the tooth root circle BC as a symmetry center, and drawing circular arc connection points G ' and A ' by using the radius and the circle of an addendum circle GA to obtain a first addendum circle G ' A '; the second molded line and the first molded line are in central symmetry, and the center of symmetry is the center of a tooth root circle BC.
2. The double-ended symmetrical rotor profile based on a single-ended screw rotor profile design according to claim 1, characterized in that: the tooth curve AB is a prolate epicycloid.
3. The double-ended symmetrical rotor profile based on a single-ended screw rotor profile design according to claim 1, characterized in that: the composite tooth curve CG is one or more of an Archimedes spiral and an envelope curve thereof, a tongue line and an envelope curve thereof, and an arc and an envelope curve thereof.
4. The double-ended symmetrical rotor profile based on a single-ended screw rotor profile design according to claim 1, characterized in that: the compound tooth curve CG comprises a transition circle CD, a hypocycloid DE, an epicycloid EF and a transition circle FG, the first compound tooth curve C 'G' comprises a first transition circle C 'D', a first hypocycloid D 'E', a first epicycloid E 'F' and a first transition circle F 'G', the first transition circle C 'D', the first hypocycloid D 'E', the first epicycloid E 'F' and the first transition circle F 'G' are obtained by clockwise rotating the transition circle CD, the hypocycloid DE, the epicycloid EF and the transition circle FG by 90 degrees of a single-end screw rotor molded line, and the rotation center is the circle center of the tooth root circle BC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910649576.3A CN110360113B (en) | 2019-07-18 | 2019-07-18 | Double-end symmetrical rotor profile based on single-end screw rotor profile design |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910649576.3A CN110360113B (en) | 2019-07-18 | 2019-07-18 | Double-end symmetrical rotor profile based on single-end screw rotor profile design |
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| Publication Number | Publication Date |
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| CN110360113A CN110360113A (en) | 2019-10-22 |
| CN110360113B true CN110360113B (en) | 2021-03-02 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111779676B (en) * | 2020-07-15 | 2021-11-19 | 西安交通大学 | Double-tooth rotor compressor rotor profile, double-tooth rotor and compressor |
| CN111828327B (en) * | 2020-07-15 | 2021-11-30 | 高秀峰 | Multi-tooth rotor compressor rotor molded line, multi-tooth rotor and compressor |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10338966A1 (en) * | 2003-08-25 | 2005-03-24 | Technische Universität Dresden | Screw-type compressor for compressors and pumps has contact points of tooth profiles for main and auxiliary rotors lying on closed contact curve |
| EP1750011A1 (en) * | 2004-05-24 | 2007-02-07 | Nabtesco Corporation | Screw rotor and screw type fluid machine |
| CN104776027B (en) * | 2013-04-26 | 2016-10-26 | 巫修海 | Strict seal type dry screw vacuum pump screw rotor |
| CN105156323B (en) * | 2015-09-10 | 2018-11-13 | 中国科学院等离子体物理研究所 | A kind of cold pressing machine rotor |
| CN107023484B (en) * | 2017-06-08 | 2019-05-31 | 中国石油大学(华东) | A kind of asymmetric screw rotor |
| CN108443145B (en) * | 2018-05-22 | 2020-04-21 | 天津华科螺杆泵技术有限公司 | Double-end spiral screw, double-screw pump adopting same and dry vacuum screw pump |
| CN108930650B (en) * | 2018-07-02 | 2020-06-19 | 西安交通大学 | Double-end claw type pump rotor and molded lines thereof |
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