CN203906294U - Screw assembly of screw vacuum pump - Google Patents
Screw assembly of screw vacuum pump Download PDFInfo
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- CN203906294U CN203906294U CN201420335246.XU CN201420335246U CN203906294U CN 203906294 U CN203906294 U CN 203906294U CN 201420335246 U CN201420335246 U CN 201420335246U CN 203906294 U CN203906294 U CN 203906294U
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- screw
- epicycloid
- circular arc
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- vacuum pump
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Abstract
The utility model provides a screw assembly of a screw vacuum pump, belongs to the technical field of vacuum pump equipment, and solves the problem that a conventional screw assembly of a screw vacuum pump is low in transmission efficiency. The screw assembly of the screw vacuum pump comprises two screws, wherein the end surface molded line of each screw consists of an epicycloids segment, a hypocycloid segment, a tooth root arc, a prolate epicycloid and a tooth top arc in sequence around the axial line of the corresponding screw; the epicycloid on one screw and the hypocycloid on the other screw are conjugate curves; the tooth root arc on one screw and the tooth top arc on the other screw are conjugate curves. The screw assembly of the screw vacuum pump can realize the complete sealing; a sealing line is short, and the working efficiency is high.
Description
Technical field
The utility model belongs to vaccum pump unit technical field, relates to a kind of screw arbor assembly of screw vacuum pump.
Background technique
Dry screw vacuum pump is the sci-tech product that technology content is very high, is mainly used in high pure vacuum technology process, and degree of vacuum is high, can adapt to bad working environments, there is the ability that extracts solidifying property, contains particulate matter gas, be particularly suitable for electronics, the fields such as chemical industry and biological medicine.Dry screw vacuum pump is a kind of displacement pump, relies on two screw rotors in pump to carry gas with the sealed volume that pump housing inner chamber forms, in inlet's formation vacuum of pump.The key technology of dry screw vacuum pump is a pair of intermeshing helical rotor, the key of intermeshing rotor is the profile of rotor, the quality of profile, to directly have influence on screw vacuum pump performance, as sealing, efficiency, area utilization factor etc., determined the manufacturing cost of pump simultaneously.
As Chinese invention patent application (application number: 201010605321.6) disclose a kind of rotor molded line of screw vacuum pump, adopt respectively five sections of curve composition the first rotors and the second rotor end-face molded line, form the molded line series of two rotors of screw vacuum pump with the rotor of identical centre distance A and a different number, the rotor molded line of screw vacuum pump of this invention is applied to two rotors, the first rotor and the second rotor are conjugation rotor end-face molded line, identical, just adopt respectively left-handed and dextrorotation, can form meshing relation, but the helix of this design and orthodrome, between helix envelope and small arc-shaped, do not seamlessly transit, special this incomplete conjugation in intersections of complex curve position, two places, there is obvious leaking area, and transition region manufacture is more time-consuming, adopt the varying pitch screw of this kind of design, because tooth root circular arc cornerite is relatively little, broadband, screw rod tooth root position is less, relatively manufacture more difficult, adopt the screw vacuum pump of two kinds of molded line cannot design higher compression ratio.
Summary of the invention
The purpose of this utility model is to have the problems referred to above for existing technology, has proposed a kind of screw arbor assembly of screw vacuum pump, and the screw arbor assembly of this screw vacuum pump can be realized sealing completely, and potted line is short, and working efficiency is high.
The purpose of this utility model can realize by following technical proposal: a kind of screw arbor assembly of screw vacuum pump, comprise two screw rods that profile is identical, rotation direction is contrary, it is characterized in that, the profile of described screw rod is made up of one section of epicycloid, one section of hypocycloid, one section of tooth root circular arc, one section of prolate epicycloid and one section of tooth top circular arc, and the profile of screw rod is followed successively by epicycloid, hypocycloid, tooth root circular arc, prolate epicycloid and tooth top circular arc around screw axis; Hypocycloid on epicycloid on a screw rod and another root screw rod is conjugate curve, and the tooth top circular arc on the tooth root circular arc on a screw rod and another root screw rod is conjugate curve.
Two screw rods parallel and reverse outer gearing formation screw rotor, the profile of screw rod, be the flank of tooth of rotor and the section line of rotor axis vertical surface, the molded line end face of this screw rod is single head, between tooth top circular arc and tooth root circular arc, set up epicycloid, hypocycloid, prolate epicycloid and make to seamlessly transit each other, can form strict sealing, avoid forming leakage region after two screw rod engagements, within the scope of a pitch, just can form the strict Seal cage that has of one's own, compact structure, rigidity are better; Within the scope of certain pitch, also make potted line shorter, therefore good seal performance, efficiency is high; Above-mentioned root circle arc forms larger cornerite, and screw rod tooth root position width is larger, therefore can design higher compression ratio, and also can adopt larger Tool in Cutting while processing this screw rod, and work efficiency is higher.
In the screw arbor assembly of above-mentioned screw vacuum pump, described epicycloid and hypocycloid intersection point, prolate epicycloid and tooth root circular arc intersection point, prolate epicycloid and tooth top circular arc intersection point and the circular arc center of circle are located along the same line.
In the screw arbor assembly of above-mentioned screw vacuum pump, described epicycloid and hypocycloid intersection point are positioned on molded line pitch circle; The molded line pitch circle center of circle overlaps with the tooth root circular arc center of circle.Make to form and seamlessly transit between epicycloid and hypocycloid, avoid occurring delay, leakage region at intersection point place, improve sealing and working efficiency.
In the screw arbor assembly of above-mentioned screw vacuum pump, described molded line Pitch radius
the distance of shaft centers L=R of described two screw rods
a+ R
b, wherein R
afor tooth top radius of arc, R
bfor fillet radius.The flank of tooth that has ensured two screw rods can be fitted completely in contact points, ensures sealing.
In the screw arbor assembly of above-mentioned screw vacuum pump, described epicycloid corner is identical with hypocycloid corner.In two screw rod engagement driving processes, identical corner can ensure the epicycloid of a screw rod and the hypocycloid of another root screw rod is completely relative and engagement gradually, avoid a screw rod epicycloid or hypocycloid to occur engaging with tooth root circular arc or the tooth top circular arc of another root screw rod, occur leakage region.
In the screw arbor assembly of above-mentioned screw vacuum pump, described epicycloid corner
r is epicycloid and hypocycloidal generation circle radius,
In the screw arbor assembly of above-mentioned screw vacuum pump, described epicycloidal equation comprises formula 1 and formula 2,
Formula 1:
Formula 2:
in formula, x, y are the right angled coordinatess of putting on epicycloid;
the corner of any point in flank profil,
In the screw arbor assembly of above-mentioned screw vacuum pump, described hypocycloidal equation comprises formula 3 and formula 4,
Formula 1:
Formula 2:
in formula: x, y are the right angled coordinatess of putting on epicycloid;
the corner of any point in flank profil,
it is hypocycloidal corner.Calculate and obtain by above-mentioned epicycloid and hypocycloidal formula, make hypocycloid and epicycloid and with other molded line sectionally smooth transition, in the time of screw rod engagement driving, form strict sealing.
In the screw arbor assembly of above-mentioned screw vacuum pump, the equation of described prolate epicycloid comprises formula 5 and formula 6,
Formula 5:
Formula 6:
in formula, x, y are the right angled coordinatess of putting on cycloid;
be cycloid corner, β is the initial angle that cycloid rotates in system of coordinates.
it is cycloid corner, screw rod relatively and the corner of another root screw rod, the angle between β line and the vertical join line of two screw rod shaft axiss that to be epicycloid and hypocycloid intersection point, prolate epicycloid and tooth root circular arc intersection point, prolate epicycloid be linked to be with tooth top circular arc intersection point and the circular arc center of circle.
In the screw arbor assembly of above-mentioned screw vacuum pump, between the prolate epicycloid side of described screw rod and the outer side surface of screw rod, there is chamfering.This chamfering can be conducive to the cutting to screw rod, makes to process convenient.
Compared with prior art, the screw arbor assembly of this screw vacuum pump has the following advantages:
1, owing to setting up epicycloid, hypocycloid, prolate epicycloid and make to seamlessly transit each other between tooth top circular arc and tooth root circular arc, can form strict sealing, avoid forming leakage region after two screw rod engagements, within the scope of a pitch, just can form the strict Seal cage that has of one's own, compact structure, rigidity are better, within the scope of a pitch, also make potted line shorter, therefore good seal performance, efficiency is high.
2, because the tooth top circular arc on the tooth root circular arc on a screw rod and another root screw rod is conjugate curve, hypocycloid on epicycloid on a screw rod and another root screw rod is conjugate curve, be that epicycloid is identical with hypocycloidal corner, therefore can ensure that the epicycloid of a screw rod and the hypocycloid of another root screw rod are completely relative and engage gradually, avoid a screw rod epicycloid or hypocycloid to occur engaging with tooth root circular arc or the tooth top circular arc of another root screw rod, occur leakage region.
3, because root circle arc forms larger cornerite, screw rod tooth root position width is larger, therefore can design higher compression ratio, simultaneously in conjunction with forming chamfering structure between the prolate epicycloid side of screw rod and the outer side surface of screw rod, in the time of this screw rod of processing, also can adopt larger Tool in Cutting, work efficiency is higher.
Brief description of the drawings
Fig. 1 is the structural representation of screw rod.
Fig. 2 is the structural representation of screw arbor assembly molded lines of rotor.
Fig. 3 is the molded line structure schematic diagram of screw arbor assembly while running to different amount.
In figure, 1, screw rod; 2, epicycloid; 3, hypocycloid; 4, tooth root circular arc; 5, prolate epicycloid; 6, tooth top circular arc; 7, molded line pitch circle.
Embodiment
Be below specific embodiment of the utility model by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiments.
As Fig. 1, shown in Fig. 2, a kind of screw arbor assembly of screw vacuum pump, comprise that two profiles are identical, the screw rod 1 that rotation direction is contrary, two screw rods 1 parallel and reverse outer gearing formation screw rod 1 rotor, screw rod 1 rotor has molded line, be the flank of tooth of rotor and the section line of rotor axis vertical surface, the profile of this screw rod 1 is single head, by one section of epicycloid 2, one section of hypocycloid 3, one section of tooth root circular arc 4, one section of prolate epicycloid 5 and one section of tooth top circular arc 6 form, and the profile of screw rod 1 is followed successively by epicycloid 2 around screw rod 1 axis, hypocycloid 3, tooth root circular arc 4, prolate epicycloid 5 and tooth top circular arc 6.Epicycloid 2 on a screw rod 1 is conjugate curve with the hypocycloid 3 on another root screw rod 1, and the tooth root circular arc 4 on a screw rod 1 is conjugate curve with the tooth top circular arc 6 on another root screw rod 1.Between tooth top circular arc 6 and tooth root circular arc 4, set up epicycloid 2, hypocycloid 3, prolate epicycloid 5 and make to seamlessly transit each other, can form strict sealing, avoid forming leakage region after 1 engagement of two screw rods, within the scope of a pitch, just can form the strict Seal cage that has of one's own, compact structure, rigidity are better; Within the scope of certain pitch, also make potted line shorter, therefore good seal performance, efficiency is high; Above-mentioned tooth root circular arc 4 forms larger cornerite, and screw rod 1 tooth root position width is larger, therefore can design higher compression ratio, and also can adopt larger Tool in Cutting while processing this screw rod 1, and work efficiency is higher.
Specifically, shown in Fig. 3, epicycloid 2 is located along the same line with tooth top circular arc 6 intersection points and the circular arc center of circle with tooth root circular arc 4 intersection points, prolate epicycloid 5 with hypocycloid 3 intersection points, prolate epicycloid 5.Epicycloid 2 is positioned on molded line pitch circle 7 with hypocycloid 3 intersection points, and molded line pitch circle 7 centers of circle overlap with tooth root circular arc 4 centers of circle, make to form and seamlessly transit between epicycloid 2 and hypocycloid 3, avoids occurring delay, leakage region at intersection point place, improves sealing and working efficiency.Epicycloid 2 corners are identical with hypocycloid 3 corners, in two screw rod 1 engagement driving processes, identical corner can ensure that the epicycloid 2 of a screw rod 1 is completely relative with the hypocycloid of another root screw rod 13 and engage gradually, avoid epicycloid 2 or the hypocycloid 3 of a screw rod 1 to occur engaging with tooth root circular arc 4 or the tooth top circular arc 6 of another root screw rod 1, occur leakage region.Between prolate epicycloid 5 sides of screw rod 1 and the outer side surface of screw rod 1, have chamfering, this chamfering can be conducive to the cutting to screw rod 1, makes to process convenient.
Molded line pitch circle 7 radiuses
The distance of shaft centers L=R of two screw rods 1
a+ R
b;
Wherein R
afor tooth top circular arc 6 radiuses, R
bfor tooth root circular arc 4 radiuses, ensure that the flank of tooth of two screw rods 1 can be fitted completely in contact points, ensure sealing.
Epicycloid 2 corners
R is the generation circle radius of epicycloid 2 and hypocycloid 3;
The equation of epicycloid 2 comprises formula 1 and formula 2,
Formula 1:
Formula 2:
In formula, x, y are the right angled coordinatess of point on epicycloid 2;
the corner of any point in flank profil,
The equation of hypocycloid 3 comprises formula 3 and formula 4,
Formula 1:
Formula 2:
In formula: x, y are the right angled coordinatess of point on epicycloid 2;
the corner of any point in flank profil,
it is the corner of hypocycloid 3.Calculate and obtain with the formula of hypocycloid 3 by above-mentioned epicycloid 2, make hypocycloid 3 and epicycloid 2 and with other molded line sectionally smooth transition, in the time of screw rod 1 engagement driving, form strict sealing.
The equation of prolate epicycloid 5 comprises formula 5 and formula 6,
Formula 5:
Formula 6:
in formula, x, y are the right angled coordinatess of putting on cycloid;
it is cycloid corner, β is the initial angle that cycloid rotates in system of coordinates, the angle between this initial angle β line and the vertical join line of two screw rod 1 shaft axiss that to be epicycloid 2 and hypocycloid 3 intersection points, prolate epicycloid 5 and tooth root circular arc 4 intersection points, prolate epicycloid 5 be linked to be with tooth top circular arc 6 intersection points and the circular arc center of circle.
When design screw rod 1, preset R
aand R
b, calculate by above-mentioned formula, and take different
value can obtain complete screw rod 1 profile, as shown in Fig. 2, calculates when state:
R
a＝70，R
b＝30，β＝-90°；
Can be calculated R
p=50, r=10;
Set up rectangular coordinate system, wherein the center of circle of tooth top circular arc 6 and tooth root circular arc 4 all overlaps with the initial point of system of coordinates, is calculated and is obtained x and the y of molded line on this system of coordinates by formula;
Epicycloid 2 calculates:
When
time, x=0, y=50, this point is the intersection point of epicycloid 2 and hypocycloid 3;
When
time, x=9.03, y=60.15, works as
get
different value in scope is in the hope of the difference on epicycloid 2;
When
time, x=41.15, y=56.63, this point is the intersection point of epicycloid 2 and tooth top circular arc 6;
Hypocycloid 3 calculates:
When
time, x=0, y=50, this point is the intersection point of epicycloid 2 and hypocycloid 3;
When
time, x=-2.85, y=34.95; Work as
get
different value in scope is in the hope of the difference on hypocycloid 3;
When
time, x=-17.61, y=24.27, this point is the intersection point of hypocycloid 3 and tooth root circular arc 4;
Prolate epicycloid 5 calculates:
When
time, x=0, y=-30, this point is the intersection point of prolate epicycloid 5 and tooth root circular arc 4;
When
time, x=6.58, y=-32.7;
When
time, x=0, y=-70, the i.e. intersection point of prolate epicycloid 5 and tooth top circular arc 6.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendments or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although more used the terms such as screw rod 1, epicycloid 2, hypocycloid 3, tooth root circular arc 4 herein, do not got rid of the possibility that uses other term.Use these terms to be only used to describe more easily and explain essence of the present utility model; They are construed to any additional restriction is all contrary with the utility model spirit.
Claims (10)
1. the screw arbor assembly of a screw vacuum pump, comprise two screw rods that profile is identical, rotation direction is contrary (1), it is characterized in that, the profile of described screw rod (1) is made up of one section of epicycloid (2), one section of hypocycloid (3), one section of tooth root circular arc (4), one section of prolate epicycloid (5) and one section of tooth top circular arc (5), and the profile of screw rod (1) is followed successively by epicycloid (2), hypocycloid (3), tooth root circular arc (4), prolate epicycloid (5) and tooth top circular arc (5) around screw rod (1) axis; Epicycloid (2) on a screw rod (1) is conjugate curve with the hypocycloid (3) on another root screw rod (1), and the tooth root circular arc (4) on a screw rod (1) is conjugate curve with the tooth top circular arc (5) on another root screw rod (1).
2. the screw arbor assembly of screw vacuum pump according to claim 1, it is characterized in that, described epicycloid (2) is located along the same line with tooth top circular arc (5) intersection point and the circular arc center of circle with tooth root circular arc (4) intersection point, prolate epicycloid (5) with hypocycloid (3) intersection point, prolate epicycloid (5).
3. the screw arbor assembly of screw vacuum pump according to claim 2, is characterized in that, described epicycloid (2) is positioned on molded line pitch circle (7) with epicycloid (2) intersection point; Molded line pitch circle (7) center of circle overlaps with tooth root circular arc (4) center of circle.
4. according to the screw arbor assembly of the screw vacuum pump described in claim 1 or 2 or 3, it is characterized in that described molded line pitch circle (7) radius
the distance of shaft centers L=R of described two screw rods (1)
a+ R
b, wherein R
afor tooth top circular arc (5) radius, R
bfor tooth root circular arc (4) radius.
5. according to screw rod (1) assembly of the screw vacuum pump described in claim 1 or 2 or 3, it is characterized in that, described epicycloid (2) corner is identical with hypocycloid (3) corner.
6. the screw arbor assembly of screw vacuum pump according to claim 4, is characterized in that, described epicycloid (2) corner
r is the generation circle radius of epicycloid (2) and hypocycloid (3),
.
7. the screw arbor assembly of the screw vacuum pump of stating according to claim 6, is characterized in that, the equation of described epicycloid (2) comprises formula 1 and formula 2,
Formula 1:
Formula 2:
in formula, x, y are the right angled coordinatess of the upper point of epicycloid (2);
the corner of any point in flank profil,
8. the screw arbor assembly of the screw vacuum pump of stating according to claim 7, is characterized in that, the equation of described hypocycloid (3) comprises formula 3 and formula 4,
Formula 1:
Formula 2:
in formula: x, y are the right angled coordinatess of the upper point of epicycloid (2);
the corner of any point in flank profil,
it is the corner of hypocycloid (3).
9. according to the screw arbor assembly of the screw vacuum pump described in claim 1 or 2 or 3, it is characterized in that, the equation of described prolate epicycloid (5) comprises formula 5 and formula 6,
Formula 5:
Formula 6:
in formula, x, y are the right angled coordinatess of putting on cycloid;
be cycloid corner, β is the initial angle that cycloid rotates in system of coordinates.
10. according to the screw arbor assembly of the screw vacuum pump described in claim 1 or 2 or 3, it is characterized in that thering is chamfering between prolate epicycloid (5) side of described screw rod (1) and the outer side surface of screw rod (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420335246.XU CN203906294U (en) | 2014-06-20 | 2014-06-20 | Screw assembly of screw vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420335246.XU CN203906294U (en) | 2014-06-20 | 2014-06-20 | Screw assembly of screw vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203906294U true CN203906294U (en) | 2014-10-29 |
Family
ID=51780577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420335246.XU Withdrawn - After Issue CN203906294U (en) | 2014-06-20 | 2014-06-20 | Screw assembly of screw vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203906294U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019034A (en) * | 2014-06-20 | 2014-09-03 | 巫修海 | Screw rod assembly of screw rod vacuum pump |
| CN105952645A (en) * | 2016-04-08 | 2016-09-21 | 山东伯仲真空设备股份有限公司 | Arc molded line screw rotor for 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 |
-
2014
- 2014-06-20 CN CN201420335246.XU patent/CN203906294U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104019034A (en) * | 2014-06-20 | 2014-09-03 | 巫修海 | Screw rod assembly of screw rod vacuum pump |
| CN105952645A (en) * | 2016-04-08 | 2016-09-21 | 山东伯仲真空设备股份有限公司 | Arc molded line screw rotor for 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 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141029 Effective date of abandoning: 20160504 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |