CN106401958B - A kind of rotor molded line of screw vacuum pump - Google Patents
A kind of rotor molded line of screw vacuum pump Download PDFInfo
- Publication number
- CN106401958B CN106401958B CN201611122028.8A CN201611122028A CN106401958B CN 106401958 B CN106401958 B CN 106401958B CN 201611122028 A CN201611122028 A CN 201611122028A CN 106401958 B CN106401958 B CN 106401958B
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- CN
- China
- Prior art keywords
- circle
- rotor
- radius
- molded line
- epicycloid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- 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
-
- 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
Abstract
The invention discloses a kind of rotor molded line of screw vacuum pump, including prolate epicycloid AB, radius RrRoot circle BC, radius r1‑RrTransition circle CG, hypocycloid GD, epicycloid DE, radius Rt‑r1Transition circle EF and radius be RtOutside circle FA.Compared with prior art, the rotor molded line of screw vacuum pump of the present invention is a kind of novel conjugate rotors molded line, two rotors are identical, it is single head asymmetric tooth, screw rotor correct engagement under the drive of synchromesh gear, when synchronous rotation, between cog interference will not occur for any position and corner, possess complete pitch curve.Simultaneously, this molded line rotor both effectively delivers torque, it is solved again because of leakage of the gas from the higher inter-tooth volume of pressure to the lower neighbouring inter-tooth volume of pressure caused by leakage triangle, ensure that pump has higher volumetric efficiency, and other opposite molded lines of rotor possess higher area utilization factor, processing and testing cost are low.
Description
Technical field
The present invention relates to the technical field of screw vacuum pump more particularly to a kind of spiral shells suitable for Twin-screw vacuum pump
Bar molded lines of rotor.
Background technology
The core component of Twin-screw vacuum pump is a pair of intermeshing non-contact screw rotor.The design of screw rotor is wanted
Flank interference does not occur when realizing synchro-meshing campaign, therefore the research of the molded line of screw rotor is dry screw vacuum pump research and development
Key technology and screw pump technology research hot spot.The quality of its molded line will directly affect the performance of screw pump, such as seal
Property, area utilization factor, theoretical pumping speed etc., while determining the processing and manufacturing cost of screw rotor.The certain screw vacuum pumps of tradition
Molded lines of rotor is unable to get complete pitch curve, screw rotor front stage gas leakage, poor sealing, and rotor flank profil is wear-resistant
Ability is low, these problems will seriously affect pumping performance and the service life of pump.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of rotor molded line of screw vacuum pump, to carry
For a kind of new screw rotor molded line, imperfect classic screw rotor pitch curve, front stage gas leakage, poor sealing, resistance to is solved
The technical problems such as wear resistance is low.
The present invention is achieved by the following technical solutions：
A kind of rotor molded line of screw vacuum pump forms rotor end-face molded line, counterclockwise successively using seven sections of curves
For prolate epicycloid AB, radius RrRoot circle BC, radius r1-RrTransition circle CG, hypocycloid GD, epicycloid DE, radius
For Rt-r1Transition circle EF and radius be RtOutside circle FA, wherein Rt+Rr=2r1, r1For the pitch radius of screw rotor；It will
The screw rotor molded line is applied to two screw rotors, two screw rotors conjugation and molded line is identical, when the two synchronize it is different
When being moved to dual AC power, complete meshing relation can be realized.
Further, the equation in coordinates formula of the prolate epicycloid AB is：
In formula,For parameter.
Further, the equation in coordinates formula of the hypocycloid GD is：
The equation in coordinates formula of the epicycloid DE is：
In formula, φ is parameter, P1The distance in the center of circle of circle, C are generated apart from hypocycloid GD for D points1It is generated for hypocycloid GD
The round center of circle is to the distance in the pitch circle center of circle, P2The distance in the center of circle of circle, C are generated apart from epicycloid DE for D points2It is given birth to for epicycloid DE
Distance of the center of circle of Cheng Yuan to the pitch circle center of circle.
The present invention has the following advantages compared with prior art：The present invention provides a kind of rotor molded line of screw vacuum pump, should
Screw rotor has drawn the advantages of domestic and international existing screw rotor molded line, is a kind of novel conjugate rotors molded line, and two rotors are complete
It is exactly the same, it is only oppositely oriented, it is single head asymmetric tooth.Screw rotor correct engagement under the drive of synchromesh gear, together
Step rotation, any position, any rotation angle will not occur between cog interference, possess complete pitch curve.This molded line rotor is existing
Torque is delivered to effect, and is solved because gas caused by leakage triangle is relatively low to pressure from the higher inter-tooth volume of pressure
Neighbouring inter-tooth volume leakage, ensure that pump has a higher volumetric efficiency, and other opposite molded lines of rotor possess higher area
Usage factor, processing and testing cost are low.Transition arc improves the wear resistance of flank profil.
Description of the drawings
Fig. 1 is the formation mechenism figure of the rotor molded line of screw vacuum pump of the present invention, wherein circle 1 is basic circle (pitch circle), circle 2
Circle is generated for prolate epicycloid AB, circle 3 generates circle for hypocycloid GD, and circle 4 generates circle for epicycloid DE；
Fig. 2 is the face type line chart of the rotor molded line of screw vacuum pump of the present invention.
Specific implementation mode
1-2 further illustrates the present invention a kind of specific implementation mode of rotor molded line of screw vacuum pump below in conjunction with the accompanying drawings.
From Figure 2 it can be seen that the tooth-shaped molded line of screw sections is mainly by prolate epicycloid AB, radius RrRoot circle BC, half
Diameter is r1-RrTransition circle CG, hypocycloid GD, epicycloid DE, radius Rt-r1Transition circle EF and radius be RtOutside circle FA
Composition, and hypocycloid GD and epicycloid DE are smoothly connected in D points, as seen from Figure 1 in Fig. 2 each section of curve formation mechenism.
The formation mechenism of prolate epicycloid AB is：Radius is the basic circle 1 of pitch circle size and generates circle 2, generates circle 2 along base
When circle 1 makees fricton-tight roll counter-clockwise, it is prolate epicycloid AB to be fixed on and generate the movement locus of a point A on circle 2, and is generated
2 center of circle O of circle2To A point distances O2The length of A is equal to outside circle FA radiuses Rt, and track moves to and stops when intersecting with outside circle.
The equation in coordinates formula of prolate epicycloid AB meets：
In formula,For parameter.
The formation mechenism of hypocycloid GD is：Radius is that the generation circle 3 of one third pitch circle size is inscribed within basic circle 1, is generated
When circle 3 makees pure rolling counterclockwise along basic circle 1, it is hypocycloid GD to be fixed on and generate the movement locus of a point D on circle 3.
The formation mechenism of epicycloid DE is：Radius is that the generation circle 4 of one third pitch circle size is cut in basic circle 1 outside, is generated
When circle 4 makees pure rolling clockwise along basic circle 1, it is epicycloid DE to be fixed on and generate the movement locus of a point D on circle 4.
The equation in coordinates formula of hypocycloid GD meets：
The equation in coordinates formula of epicycloid DE meets：
In formula, φ is parameter, P1The distance in the center of circle of circle, C are generated apart from hypocycloid GD for D points1It is generated for hypocycloid GD
The round center of circle is to the distance in the pitch circle center of circle, P2The distance in the center of circle of circle, C are generated apart from epicycloid DE for D points2It is given birth to for epicycloid DE
Distance of the center of circle of Cheng Yuan to the pitch circle center of circle.
Setting herein generates circle 3 and generates the one third that circle 4 is 1 radius of basic circle, greatly simplifies curved dies in this way,
Facilitate all technical for calculating molded line and rotor, is convenient for the processing of rotor, detection.
With, a little for the center of circle, make on basic circle 1 circular arc simultaneously with BC sections and GD sections tangent, the transition circles in as Fig. 2
CG.Again with, a little for the center of circle, make on basic circle 1 circular arc simultaneously with DE sections and FA sections tangent, the transition circle EF in as Fig. 2.
So far, a kind of rotor molded line of screw vacuum pump of the present invention is obtained, as shown in Figure 2.
The driving and driven screw rotor that this tooth-shaped molded line is formed, can shape between front stage and pump case in engagement process
At the seal chamber theoretically strictly sealed, leakage triangle is eliminated, avoids the leakage of rotor front stage gas.Reduce spiral shell
Abrasion when bar is run, improves the wearability of Quimby pump.This molded line possesses the area utilization factor almost for 0.5, significantly
Improve pumping efficiency.
It is a kind of detailed embodiment and specific operating process of the present invention above, is before being with technical solution of the present invention
It puts and is implemented, but protection scope of the present invention is not limited to the above embodiments.
Claims (1)
1. a kind of rotor molded line of screw vacuum pump, which is characterized in that rotor end-face molded line is formed using seven sections of curves, by counterclockwise
Direction is followed successively by prolate epicycloid AB, radius RrRoot circle BC, radius r1-RrTransition circle CG, hypocycloid GD, outer pendulum
Line DE, radius Rt-r1Transition circle EF and radius be RtOutside circle FA, wherein Rt+Rr=2r1, r1For the section of screw rotor
Radius of circle；
The equation in coordinates formula of the prolate epicycloid AB is：
In formula,For parameter；
The equation in coordinates formula of the hypocycloid GD is：
The equation in coordinates formula of the epicycloid DE is：
In formula, φ is parameter, P1The distance in the center of circle of circle, C are generated apart from hypocycloid GD for D points1Circle is generated for hypocycloid GD
The center of circle is to the distance in the pitch circle center of circle, P2The distance in the center of circle of circle, C are generated apart from epicycloid DE for D points2Circle is generated for epicycloid DE
The center of circle to the pitch circle center of circle distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611122028.8A CN106401958B (en) | 2016-12-08 | 2016-12-08 | A kind of rotor molded line of screw vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611122028.8A CN106401958B (en) | 2016-12-08 | 2016-12-08 | A kind of rotor molded line of screw vacuum pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106401958A CN106401958A (en) | 2017-02-15 |
| CN106401958B true CN106401958B (en) | 2018-08-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611122028.8A Active CN106401958B (en) | 2016-12-08 | 2016-12-08 | A kind of rotor molded line of screw vacuum pump |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854504B (en) * | 2019-04-02 | 2020-03-24 | 萨震压缩机（上海）有限公司 | Energy-saving screw molded line |
| CN110285055B (en) * | 2019-07-18 | 2021-07-06 | 合肥工业大学 | Rotor profile of double-screw vacuum pump |
| CN111927777A (en) * | 2019-12-31 | 2020-11-13 | 中科九微科技有限公司 | Screw vacuum pump and design method of rotor profile thereof |
| CN113833655B (en) * | 2021-11-02 | 2023-05-26 | 杭州久益机械股份有限公司 | Screw vacuum pump rotor and screw vacuum pump |
| CN115076106B (en) * | 2022-06-24 | 2023-12-08 | 宁波爱发科机械制造有限公司 | Screw vacuum pump rotor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6139299A (en) * | 1998-05-29 | 2000-10-31 | Carrier Corporation | Conjugate screw rotor profile |
| CN202926637U (en) * | 2012-10-09 | 2013-05-08 | 台州职业技术学院 | Molded line for dry-type screw vacuum pump rotor |
| CN105240277B (en) * | 2015-11-09 | 2017-05-03 | 中国石油大学(华东) | Fully-smooth screw rotor of twin-screw vacuum pump |
| CN205533238U (en) * | 2016-04-08 | 2016-08-31 | 山东伯仲真空设备股份有限公司 | A circular arc molded lines screw rotor for screw vacuum pump |
| CN206329493U (en) * | 2016-12-08 | 2017-07-14 | 合肥工业大学 | A kind of rotor molded line of screw vacuum pump |
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- 2016-12-08 CN CN201611122028.8A patent/CN106401958B/en active Active
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| CN106401958A (en) | 2017-02-15 |
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