CN106351832A - Screw assembly of dry screw vacuum pump - Google Patents
Screw assembly of dry screw vacuum pump Download PDFInfo
- Publication number
- CN106351832A CN106351832A CN201611092527.7A CN201611092527A CN106351832A CN 106351832 A CN106351832 A CN 106351832A CN 201611092527 A CN201611092527 A CN 201611092527A CN 106351832 A CN106351832 A CN 106351832A
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- CN
- China
- Prior art keywords
- section
- screw
- vacuum pump
- segment
- envelope line
- 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
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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
Abstract
The invention provides a screw assembly of a dry screw vacuum pump, belongs to the technical field of vacuum pumps, and solves the technical problems such as low strength of the existing screw vacuum pump and the like. The screw assembly of the dry screw vacuum pump comprises screws with identical end surface profile lines and opposite rotation directions. The end surface profile line of each screw comprises a tooth top arc segment, a cycloid segment, a tooth root round segment, a connection segment and a connection envelope line segment; the connection segments are linear; a tangent line of one end point, connected with the corresponding connection segment, of each tooth root round segment is collinear with the corresponding connection section; the connection envelope line segments are curved; a tangent line of one end point, connected with the corresponding connection segment, of each connection envelope line segment is collinear with the corresponding connection segment; the connection envelope line segments are in smooth transition with the tooth top arc segments; the connection segment of one screw is conjugated with the connection envelope line segment of the other screw. The screw assembly of the dry screw vacuum pump has the advantages of convenience in processing of the screws and high strength.
Description
Technical field
The invention belongs to vaccum pump unit technical field, it is related to a kind of screw arbor assembly of dry screw vacuum pump.
Background technology
Screw vacuum pump is to make, using a pair of screw rod, air-breathing and the aerofluxuss that synchronous high-speed reversely rotates and produces in pump case
The air-extractor of effect, it is the renewal product of oil sealing vacuum pump, can extract containing a large amount of water vapour and a small amount of dust
Gas occasion, each big pharmacy and chemical enterprise are used widely at home.
The key technology of screw vacuum pump is intermeshing screw rod, and intermeshing screw rod key is profile, spiral shell
The profile of bar, i.e. the section line of the flank of tooth of rotor and rotor axis vertical；Profile directly influences screw vacuum
The performance of pump, such as sealing, efficiency, area utilization factor etc., determine the processing and manufacturing cost of pump simultaneously.
Chinese patent literature discloses a kind of screw arbor assembly of screw vacuum pump [Authorization Notice No. cn104019034b], spiral shell
The profile of bar is by one section of epicycloid, one section of hypocycloid, one section of tooth root circular arc, one section of prolate epicycloid and one section of addendum circle arc
Composition.In this patent, epicycloid and hypocycloid are curvilinear structures, and the structure of therefore this screw rotor is relative complex, leads to be difficult
Processing, the hypocycloid being simultaneously connected with tooth root circular arc is the curve of indent, leads to screw rotor root thickness relatively small, leads to
The intensity of screw rotor root is relatively small, leads to the intensity of screw rod less.
Content of the invention
The purpose of the present invention is to there are the problems referred to above for existing technology it is proposed that a kind of spiral shell of dry screw vacuum pump
Bar assembly, present invention solves the technical problem that be so that screw rod adds in the case that two screw rods of guarantee enable correctly to engage
Work is convenient and intensity is big.
The purpose of the present invention can be realized by following technical proposal:
A kind of screw arbor assembly of dry screw vacuum pump, including identical, the oppositely oriented screw rod of two profiles, described
The profile of screw rod by one section of outside circle segmental arc being sequentially connected, one section of cycloid section, one section of root circle section, one section of joining section and
One section of linking envelope line segment forms it is characterised in that described joining section is straight line, described root circle Duan Shangyu joining section connected
The tangent line of end end points is conllinear with joining section, and described linking envelope line segment is curve, with joining section phase on described linking envelope line segment
Even the tangent line of one end end points is conllinear with joining section, rounding off between described linking envelope line segment and outside circle segmental arc, and wherein one
Joining section on root screw rod is conjugated with the envelope line segment that is connected on another screw rod.
Enable correctly to engage it is ensured that dry type spiral shell in incorgruous synchronous rotary using two screw rods of above-mentioned profile
The normal operation of bar vacuum pump；Specifically, when rotated on the linking envelope line segment of a wherein screw rod and another screw rod
Joining section engagement, wherein the joining section of a screw rod is engaged with the linking envelope line segment on another screw rod, wherein one spiral shell
The root circle section of bar is engaged with the outside circle segmental arc on another screw rod, in the cycloid section of a wherein screw rod and another screw rod
Cycloid section and the intersection point engagement intersected of outside circle segmental arc, the tooth on the outside circle segmental arc of a wherein screw rod and another screw rod
The cycloid section on intersection point and another screw rod that root circle section engagement, the cycloid section on wherein one screw rod and outside circle segmental arc intersect
Engagement；Joining section is straight line simultaneously, and linking envelope line segment is that the structure of curve makes the structure of screw rotor relatively easy, therefore
Make in processing easy to process, reduce processing cost；Further by root circle Duan Shangyu joining section connected one end end points
Tangent line and joining section collinearly understand, the root of screw rotor is relatively bigger, and screw rotor root intensity is high, improves the whole of screw rod
Body intensity.
In the screw arbor assembly of above-mentioned dry screw vacuum pump, curvature oneself and the addendum circle arc of described linking envelope line segment
One end of Duan Xianglian increases to the other end.The structure of linking envelope line segment can guarantee that two screw rods can be real in incorgruous synchronous rotary
Now correctly engage.
In the screw arbor assembly of above-mentioned dry screw vacuum pump, the equation of described linking envelope line segment is:In formula, ro is pitch radius, and rn is root circle section radius, and t1 is
Variable, the span t1 ∈ [0, pi/2] of t1.Above-mentioned linking envelope line segment can guarantee that two screw rods energy in incorgruous synchronous rotary
Realize correct engagement；Make screw rotor root intensity high so that the structure of screw rotor is relatively easy, processing is more square simultaneously
Just.
In the screw arbor assembly of above-mentioned dry screw vacuum pump, the equation of described joining section is:Formula
Middle t2 is variable, the span of t2Above-mentioned joining section can guarantee that two screw rods in incorgruous synchronous rotary
When enable correctly to engage；Make screw rotor root intensity high so that the structure of screw rotor is relatively easy, processing simultaneously
More convenient.
In the screw arbor assembly of above-mentioned dry screw vacuum pump, the corresponding central angle of described joining section and linking envelope
The corresponding central angle size of section is α, and the size of α is α=π/4.The corresponding central angle of joining section is corresponding with linking envelope line segment
Central angle be definite value, relation ensure two screw rods enable in incorgruous synchronous rotary correctly to engage.
In the screw arbor assembly of above-mentioned dry screw vacuum pump, the radius rn size of described root circle section isIn formula, ro is pitch radius.Root circle section can guarantee that two screw rods incorgruous same with the relation of pitch radius
Enable correctly to engage during step rotation.
In the screw arbor assembly of above-mentioned dry screw vacuum pump, the described corresponding central angle of outside circle segmental arc and described tooth
Root circle section corresponding central angle size is β, and the size of β is β=3 π/4.It is straight line using joining section, linking envelope line segment is
During the structure of curve, the central angle of outside circle segmental arc central angle corresponding with root circle section is definite value, and this relation ensures two screw rods
Enable in incorgruous synchronous rotary correctly to engage.
In the screw arbor assembly of above-mentioned dry screw vacuum pump, the equation of described root circle section is:In formula, t3 is variable, the span t3 ∈ [0, β] of t3.Above-mentioned root circle Duan Yuwei straight line
Joining section and match for the linking envelope line segment of curve, can guarantee that two screw rods just enable in incorgruous synchronous rotary
True engagement.
In the screw arbor assembly of above-mentioned dry screw vacuum pump, the equation of described outside circle segmental arc is:In formula, rm is the radius of outside circle segmental arc, and the size of rm is rm=2ro-rn, and t4 is variable,
T4 span t4 ∈ [0, β].Above-mentioned outside circle segmental arc and the joining section for straight line and be connected envelope line segment phase for curve
Coupling, can guarantee that two screw rods enable in incorgruous synchronous rotary correctly to engage.
In the screw arbor assembly of above-mentioned dry screw vacuum pump, the equation of described cycloid section is:In formula, t5 is variable, t5 span t5 ∈ [0, acos (ro/
rm)].The joining section of above-mentioned cycloid Duan Yuwei straight line and the linking envelope line segment for curve match, and can guarantee that two screw rods
Enable in incorgruous synchronous rotary correctly to engage.
Compared with prior art, the screw arbor assembly of this dry screw vacuum pump has and can guarantee that two screw rods in incorgruous synchronization
Enable during rotation correctly to engage, make screw rotor root intensity high, screw rotor structure is relatively easy simultaneously, realize adding
Work more easily advantage.
Brief description
Fig. 1 is partial schematic sectional view during two screw rod engagements in this screw arbor assembly.
Fig. 2 is the structural representation of the molded lines of rotor of this screw arbor assembly.
Fig. 3 is the state diagram that two screw rods often rotate different angles when 24 °.
In figure, 1, screw rod；2nd, outside circle segmental arc；3rd, cycloid section；4th, root circle section；5th, joining section；6th, it is connected envelope line segment.
Specific embodiment
The following is the specific embodiment of the present invention and combine accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
As depicted in figs. 1 and 2, to include two profiles identical, oppositely oriented for the screw arbor assembly of dry screw vacuum pump
Screw rod 1, the profile of screw rod 1 by one section of outside circle segmental arc being sequentially connected, 3, one section of root circle section 4 of 2, one section of cycloid section,
One section of joining section 5 and one section of linking envelope line segment 6 form, and joining section 5 is straight line, and root circle section 4 is connected with joining section 5 one end
The tangent line of end points and joining section 5 is conllinear, and linking envelope line segment 6 is curve, the curvature of linking envelope line segment 6 certainly with outside circle segmental arc
2 one end being connected increase to the other end, and the tangent line of one end end points that linking envelope line segment 6 is connected with joining section 5 is with joining section 5 altogether
Line, rounding off between linking envelope line segment 6 and outside circle segmental arc 2, the joining section 5 on wherein one screw rod 1 and another spiral shell
Linking envelope line segment 6 on bar 1 is conjugated.
The equation of linking envelope line segment 6 is:
In formula, ro is pitch radius, and rn is root circle section 4
Radius, t1 is variable, the span t1 ∈ [0, pi/2] of t1, or linking envelope line segment 6 also can pass throughEquation represent, in formula ro be pitch radius, rn be root circle section 4 radius,
T1 is variable, the span t1 ∈ [0.7071,1] of t1.
The equation of joining section 5 is:In formula, t2 is variable, the span of t2Rank
Connect the corresponding central angle of section 5 and the linking corresponding central angle size of envelope line segment 6 is α, the size of α is α=π/4.
The radius of root circle section 4 is:In formula, ro is pitch radius.The corresponding center of circle of outside circle segmental arc 2
Angle and the corresponding central angle size of root circle section 4 are β, and the size of β is β=3 π/4.
The equation of root circle section 4 is:In formula, t3 is variable, span t3 of t3
∈[0,β].The equation of outside circle segmental arc 2 is:In formula, rm is the radius of outside circle segmental arc 2,
The size of rm is rm=2ro-rn, and t4 is variable, t4 span t4 ∈ [0, β].The equation of cycloid section 3 is:In formula, t5 is variable, t5 span t5 ∈ [0, acos (ro/
rm)].
In the present embodiment, when pitch radius is for ro=20, root circle section 4 radius isOutside circle segmental arc 2
Radius beBeing connected envelope line segment 6 is
Joining section 5 is:Root circle section 4 is
Outside circle segmental arc 2 is
Cycloid section 3 is
In concrete the present embodiment, molded line is as follows with the correction data of industry standard:
From upper form, using its pole in the case of ensureing pumping efficiency of dry screw vacuum pump of this screw arbor assembly
The parameter of limits pressure, noise and matched power is superior to industry standard.
As shown in figure 3, when rotated, in Fig. 3,2,3 is the tooth in the root circle section 4 and another screw rod 1 of a screw rod 1
Tip circle segmental arc 2 engages；In Fig. 3,4 is the cycloid section 3 in the cycloid section 3 and another screw rod 1 of a screw rod 1 and outside circle segmental arc 2
Intersecting intersection point engagement；In Fig. 3,4,5 is the cycloid section 3 in the cycloid section 3 and another screw rod 1 of a screw rod 1 and addendum circle arc
The intersecting intersection points engagement of section 2, the cycloid section 3 on a screw rod 1 and outside circle segmental arc 2 intersect simultaneously intersection point and another screw rod
Cycloid section 3 on 1 engages；In Fig. 36 be a screw rod 1 on cycloid section 3 and outside circle segmental arc 2 intersect intersection point with another
Cycloid section 3 on screw rod 1 engages；In Fig. 3,7,8,9 is the tooth on outside circle segmental arc 2 and another screw rod 1 on a screw rod 1
Root circle section 4 engages；In Fig. 3,10,11,12 is joining section 5 on a screw rod 1 and be connected envelope line segment 6 on another screw rod 1
Engagement；In Fig. 3,13,14,15,1 is that a screw rod 1 linking envelope line segment 6 is engaged with the joining section 5 on another screw rod 1.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Claims (10)
1. a kind of screw arbor assembly of dry screw vacuum pump, including identical, the oppositely oriented screw rod (1) of two profiles, institute
The profile stating screw rod (1) is by one section of outside circle segmental arc (2) being sequentially connected, one section of cycloid section (3), one section of root circle section
(4), one section of joining section (5) and one section of linking envelope line segment (6) form it is characterised in that described joining section (5) is straight line, institute
The tangent line stating the upper one end end points that is connected with joining section (5) of root circle section (4) is conllinear with joining section (5), described linking envelope line segment
(6) it is curve, the tangent line of the upper one end end points that is connected with joining section (5) of described linking envelope line segment (6) is conllinear with joining section (5),
Described linking envelope line segment (6) with outside circle segmental arc (2) between rounding off, the joining section (5) on wherein one screw rod (1) and
Linking envelope line segment (6) conjugation on another screw rod (1).
2. the screw arbor assembly of dry screw vacuum pump according to claim 1 is it is characterised in that described linking envelope line segment
(6) curvature is increased from the one end being connected with outside circle segmental arc (2) to the other end.
3. the screw arbor assembly of dry screw vacuum pump according to claim 1 and 2 is it is characterised in that described root circle section
(4) radius rn size isIn formula, ro is pitch radius.
4. the screw arbor assembly of dry screw vacuum pump according to claim 3 is it is characterised in that described linking envelope line segment
(6) equation is:
In formula, ro is pitch radius, and rn is root circle section (4) half
Footpath, t1 is variable, the span t1 ∈ [0, pi/2] of t1.
5. the screw arbor assembly of dry screw vacuum pump according to claim 3 is it is characterised in that described joining section (5)
Equation is:In formula, t2 is variable, the span of t2
6. the screw arbor assembly of dry screw vacuum pump according to claim 3 is it is characterised in that described joining section (5) is right
The central angle answered and the corresponding central angle size of linking envelope line segment (6) are α, and the size of α is α=π/4.
7. the screw arbor assembly of dry screw vacuum pump according to claim 3 is it is characterised in that described outside circle segmental arc
(2) corresponding central angle and the corresponding central angle size of described root circle section (4) are β, and the size of β is β=3 π/4.
8. the screw arbor assembly of dry screw vacuum pump according to claim 7 is it is characterised in that described root circle section (4)
Equation be:In formula, t3 is variable, the span t3 ∈ [0, β] of t3.
9. the screw arbor assembly of dry screw vacuum pump according to claim 3 is it is characterised in that described outside circle segmental arc
(2) equation is:In formula, rm is the radius of outside circle segmental arc (2), and the size of rm is rm=
2ro-rn, t4 are variable, t4 span t4 ∈ [0, β].
10. the screw arbor assembly of dry screw vacuum pump according to claim 9 is it is characterised in that described cycloid section (3)
Equation is:
In formula, rm is the radius of outside circle segmental arc (2), the size of rm
For rm=2ro-rn, t5 is variable, t5 span t5 ∈ [0, acos (ro/rm)].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092527.7A CN106351832B (en) | 2016-12-01 | 2016-12-01 | A kind of screw arbor assembly of dry screw vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092527.7A CN106351832B (en) | 2016-12-01 | 2016-12-01 | A kind of screw arbor assembly of dry screw vacuum pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106351832A true CN106351832A (en) | 2017-01-25 |
| CN106351832B CN106351832B (en) | 2018-07-06 |
Family
ID=57862035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611092527.7A Active CN106351832B (en) | 2016-12-01 | 2016-12-01 | A kind of screw arbor assembly of dry screw vacuum pump |
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| Country | Link |
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| CN (1) | CN106351832B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562456A (en) * | 2022-03-18 | 2022-05-31 | 四川莱斯特真空科技有限公司 | Screw rotor and assembly thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005351238A (en) * | 2004-06-14 | 2005-12-22 | Shinko Seiki Co Ltd | Screw rotor |
| CN1936328A (en) * | 2006-09-29 | 2007-03-28 | 中国船舶重工集团公司第七一一研究所 | Noval tooth-type screw rod |
| CN102465871A (en) * | 2010-11-17 | 2012-05-23 | 上海格什特螺杆科技有限公司 | Screw rotor end face tooth type |
| CN105317677A (en) * | 2015-11-09 | 2016-02-10 | 中国石油大学(华东) | Screw rotor without acute-angle cusp |
| CN206246360U (en) * | 2016-12-01 | 2017-06-13 | 浙江创为真空设备有限公司 | A kind of screw arbor assembly of dry screw vacuum pump |
-
2016
- 2016-12-01 CN CN201611092527.7A patent/CN106351832B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005351238A (en) * | 2004-06-14 | 2005-12-22 | Shinko Seiki Co Ltd | Screw rotor |
| CN1936328A (en) * | 2006-09-29 | 2007-03-28 | 中国船舶重工集团公司第七一一研究所 | Noval tooth-type screw rod |
| CN102465871A (en) * | 2010-11-17 | 2012-05-23 | 上海格什特螺杆科技有限公司 | Screw rotor end face tooth type |
| CN105317677A (en) * | 2015-11-09 | 2016-02-10 | 中国石油大学(华东) | Screw rotor without acute-angle cusp |
| CN206246360U (en) * | 2016-12-01 | 2017-06-13 | 浙江创为真空设备有限公司 | A kind of screw arbor assembly of dry screw vacuum pump |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114562456A (en) * | 2022-03-18 | 2022-05-31 | 四川莱斯特真空科技有限公司 | Screw rotor and assembly thereof |
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| Publication number | Publication date |
|---|---|
| CN106351832B (en) | 2018-07-06 |
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Address after: No. 6 Taizhou 317015 Zhejiang 317000 Toumen port Second Avenue Binhai New District Management Committee Applicant after: Zhejiang created as a vacuum equipment Limited by Share Ltd Address before: No. 6 Taizhou 317015 Zhejiang 317000 Toumen port Second Avenue Binhai New District Management Committee Applicant before: ZHEJIANG CHUANGWEI VACUUM EQUIPMENT CO., LTD. |
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