CN206206156U - A kind of screw vacuum pump - Google Patents
A kind of screw vacuum pump Download PDFInfo
- Publication number
- CN206206156U CN206206156U CN201621287005.8U CN201621287005U CN206206156U CN 206206156 U CN206206156 U CN 206206156U CN 201621287005 U CN201621287005 U CN 201621287005U CN 206206156 U CN206206156 U CN 206206156U
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- section
- cycloid
- vacuum pump
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- segmental arc
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Abstract
The utility model provides a kind of screw vacuum pump, belongs to vacuum pump technology field.It solves the existing more low technical problem of screw vacuum pump compression ratio.This screw vacuum pump includes identical, the oppositely oriented screw rod of two profiles, the profile of screw rod is made up of one section of outside circle segmental arc being sequentially connected, one section of cycloid section, one section of root circle section, one section of point cycloid section and one section of node cycloid section, point cycloid section is the camber line of indent, rounding off between point cycloid section and root circle section, point cycloid section and node cycloid section are conjugated each other, node cycloid section is the camber line of evagination, point cycloid section and node cycloid section intersection form wedge angle one, and node cycloid section forms wedge angle two with outside circle segmental arc intersection.The utility model has the advantages that the compression ratio for improving screw vacuum pump.
Description
Technical field
The utility model belongs to vacuum pump technology field, is related to a kind of screw vacuum pump.
Background technology
Screw vacuum pump is to make air-breathing and the exhaust that synchronous high-speed is reversely rotated and produced in pump case using a pair of screw rods
The air-extractor of effect, it is the renewal product of oil sealing vacuum pump, can extract and contain a large amount of water vapours and a small amount of dust
Gas occasion, major 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, end
Face molded line directly influences the performance of screw vacuum pump, such as sealing, efficiency, area utilization factor, while determining pump
Processing and manufacturing cost.
A kind of screw arbor assembly of screw vacuum pump disclosed in current Chinese patent literature【Authorization Notice No.
CN104019034】, including identical, the oppositely oriented screw rod of two profiles, the profile of screw rod 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, the profile of screw rod is around spiral shell
Rod axis are followed successively by epicycloid, hypocycloid, tooth root circular arc, prolate epicycloid and addendum circle arc.The face type of the screw rod of the structure
The tooth top band of the screw rod that line is obtained is narrower, causes the sealing area between screw rod and the pump housing to reduce, and causes the gas can be from spiral shell
Pass through between bar tooth top band and pump housing inwall, the compression ratio that result in screw vacuum pump is relatively low.
The content of the invention
The purpose of this utility model is directed to existing technology and there is above mentioned problem, it is proposed that a kind of screw vacuum pump, this
The technical problem that utility model is solved is to improve screw vacuum pump in the case where two screw rods in ensureing screw vacuum pump are engaged
Compression ratio.
The purpose of this utility model can be realized by following technical proposal：
A kind of screw vacuum pump, including identical, the oppositely oriented screw rod of two profiles, the profile of the screw rod
By the one section of outside circle segmental arc, one section of cycloid section, one section of root circle section, one section of point cycloid section and the one section of node cycloid that are sequentially connected
Duan Zucheng, it is characterised in that described cycloid section is the camber line of indent, round and smooth mistake between described cycloid section and root circle section
Cross, described cycloid section and node cycloid section are conjugated each other, the node cycloid section is the camber line of evagination, described cycloid section and
Node cycloid section intersection forms wedge angle one, and the node cycloid section forms wedge angle two with outside circle segmental arc intersection；
The equation of described cycloid section is：
Wherein Rm is the radius of outside circle segmental arc, and Ro is the radius of pitch circle, and β 2 is the corresponding central angle of point cycloid section, φ °
It is the initial angle of a cycloid section and node cycloid section joining in coordinate system, t2 is variable, span t2 ∈ [0, acos
((3Ro2+Rm2)/4RoRm)]；
The equation of node cycloid section is：Wherein t1 is
Variable, span t1 ∈ [0, acos ((5Ro2-Rm2)/4Ro2)]。
The flank of tooth of the profile of screw rod, i.e. rotor and the section line of rotor axis vertical plane；The face type of above-mentioned screw rod
Cable architecture can operationally cause two screw rods in engagement in rotation, and the outside circle segmental arc of one of screw rod can be with another spiral shell
The root circle section engagement of bar, cycloid section intersects with outside circle segmental arc on another screw rod of cycloid Duan Huiyu of one of screw rod
Point gearing, the engagement of outside circle segmental arc, the point of one of screw rod on another screw rod of root circle Duan Huiyu of one of screw rod
Wedge angle two on another screw rod of cycloid Duan Huiyu is engaged, on another screw rod of node cycloid Duan Huiyu of one of screw rod
Wedge angle one is engaged, and engagement and sealing between when rotating realizing two screw rods by above-mentioned fit system, and good sealing effect are protected
Demonstrate,prove the normal operation of screw vacuum pump；Further, point cycloid section and node cycloid section can cause screw rod using said structure
Tooth top band is wider, and tooth top band wider improves the sealing effectiveness between screw rod and pump housing inwall so that curved surface is sealed
Path clearance length is more long, it is to avoid gas passes through between screw rod tooth top band and pump housing inwall, improves screw vacuum pump
Compression ratio.
In above-mentioned screw vacuum pump, the corresponding central angle of node cycloid section is β 1, the expression between β 1 and β 2
Equation is：β 1=β 2=acos (λ -0.125 λ of 0.75 λ+0.375/3), in formula：λ is the radius Rm and pitch circle of outside circle segmental arc
Radius Ro ratio, its value is λ=Rm/Ro, and the span of λ is λ ∈ [1.25,1.65].The structure is caused in two spiral shells
Wedge angle two during bar engagement in rotation on point cycloid another screw rod of Duan Huiyu of one of screw rod is engaged, one of screw rod
Wedge angle one on another screw rod of node cycloid Duan Huiyu is engaged, and causes wedge angle two with corresponding cycloid when engagement
Section and wedge angle one and corresponding node cycloid section good sealing effect；When the power output required for vavuum pump is smaller, λ can be with
Take 1.25 or close to 1.25 value, 1.65 can be taken when the power output required for vavuum pump is larger or close to 1.65
Value.
In above-mentioned screw vacuum pump, the equation of the root circle section is：
Wherein Rn is the radius of root circle section, and specially Rn=2Ro-Rm, t3 are variable, and span t3 ∈ [0, γ 1 °], 1 ° of γ are
The corresponding central angle of root circle section.The engagement that the root circle section obtained using party's formula can be met when two screw rods are rotated is close
Envelope, and good sealing effect, while can realize that the tooth top band of screw rod is wider, tooth top band wider improves screw rod and the pump housing
Sealing effectiveness between inwall, improves the compression ratio of screw vacuum pump.
In above-mentioned screw vacuum pump, the equation of the outside circle segmental arc is：
Wherein Rm is the radius of outside circle segmental arc, and Rm=2Ro-Rn, t4 are change
Amount, 2 ° of span t4 ∈ [0, γ 2 °], γ is the corresponding central angle of outside circle segmental arc.The outside circle obtained using party's formula
Segmental arc can meet engagement sealing when two screw rods are rotated, and good sealing effect, at the same can realize the tooth top band of screw rod compared with
Width, tooth top band wider improves the sealing effectiveness between screw rod and pump housing inwall, improves the compression ratio of screw vacuum pump.
In above-mentioned screw vacuum pump, corresponding 1 ° of the central angle γ of root circle section circles corresponding with outside circle segmental arc
2 ° of heart angle γ is identical, and expression is
1 °=γ of γ, 2 °=π-β 1=π-acos (λ -0.125 λ ∧ 3 of 0.75 λ+0.375/).
The corresponding central angle of root circle section and the corresponding central angle of outside circle segmental arc for meeting the equation can guarantee that two spiral shells
Engagement sealing when bar is rotated, and good sealing effect.
In above-mentioned screw vacuum pump, the equation of the cycloid section is：
Wherein t5 be variable, span t5 ∈ [0,
acos(Ro/Rm)].The engagement that the cycloid section obtained using party's formula can be met when two screw rods are rotated is sealed, and sealing effect
Really good, while can realize that the tooth top band of screw rod is wider, tooth top band wider is improved between screw rod and pump housing inwall
Sealing effectiveness, improves the compression ratio of screw vacuum pump.
Compared with prior art, screw vacuum pump is improve in the case that this screw vacuum pump in guarantee with normally running
The advantage of compression ratio.
Brief description of the drawings
Fig. 1 is structural representation when two screw rods are engaged in this screw vacuum pump.
Fig. 2 is two position views of the profile of screw rod.
Fig. 3 be two screw rods profile turn an angle after structural representation.
In figure, 1, screw rod；2nd, outside circle segmental arc；3rd, cycloid section；4th, root circle section；5th, point cycloid section；6th, node cycloid section；
7th, wedge angle one；8th, wedge angle two.
Specific embodiment
The following is specific embodiment of the utility model and with reference to accompanying drawing, further is made to the technical solution of the utility model
Description, but the utility model is not limited to these embodiments.
Embodiment one
As shown in Figure 1 to Figure 3, screw vacuum pump includes identical, the oppositely oriented screw rod 1 of two profiles, screw rod 1
Profile is by 2, one section of one section of outside circle segmental arc being sequentially connected, 3, one section of cycloid section, 4, one section of root circle section, 5 and of point cycloid section
One section of node cycloid section 6 is constituted, and point cycloid section 5 is the camber line of indent, rounding off, point between point cycloid section 5 and root circle section 4
Cycloid section 5 and node cycloid section 6 are conjugated each other, and node cycloid section 6 is the camber line of evagination, put cycloid section 5 and node cycloid 6 phases of section
Wedge angle 1 is formed at friendship, node cycloid section 6 forms wedge angle 28 with the intersection of outside circle segmental arc 2；The equation of point cycloid section 5
For：
Wherein Rm is the radius of outside circle segmental arc 2, and Ro is the radius of pitch circle, and β 2 is point cycloid 5 corresponding central angles of section,
The φ ° of initial angle for point cycloid section 5 and node cycloid 6 joinings of section in coordinate system, t2 is variable, span t2 ∈ [0,
acos((3Ro2+Rm2)/4RoRm)]；
Node cycloid section 6 equation be：Wherein t1 is change
Amount, span t1 ∈ [0, acos ((5Ro2-Rm2)/4Ro2)]。
Node cycloid 6 corresponding central angles of section are β 1, and the expression equation between β 1 and β 2 is：β 1=β 2=acos
(0.75λ+0.375/λ-0.125λ3), in formula：λ is the ratio of the radius Rm and the radius Ro of pitch circle of outside circle segmental arc 2, its value
It is λ=Rm/Ro, the span of λ is λ ∈ [1.25,1.65].
Root circle section 4 equation be：Wherein Rn is the radius of root circle section 4, tool
Body is Rn=2Ro-Rm, and t3 is variable, and 1 ° of span t3 ∈ [0, γ 1 °], γ is root circle 4 corresponding central angles of section.
The equation of outside circle segmental arc 2 is：Wherein Rm is outside circle segmental arc 2
Radius, Rm=2Ro-Rn, t4 are variable, and 2 ° of span t4 ∈ [0, γ 2 °], γ is the corresponding central angle of outside circle segmental arc 2.
41 ° of corresponding central angle γ of root circle section, 2 ° of identical, expressions of central angle γ corresponding with outside circle segmental arc 2
It is 1 °=γ of γ, 2 °=π-β 1=π-acos (λ -0.125 λ ∧ 3 of 0.75 λ+0.375/).
Cycloid section 3 equation be：Wherein t5 is change
Amount, span t5 ∈ [0, acos (Ro/Rm)].
The flank of tooth of the profile of screw rod 1, i.e. rotor and the section line of rotor axis vertical plane；The end face of above-mentioned screw rod 1
Molded line structure can operationally cause two screw rods 1 in engagement in rotation, the outside circle segmental arc 2 of one of screw rod 1 can with it is another
The root circle section 4 of a piece screw rod 1 is engaged, and the cycloid section 3 of one of screw rod 1 can be with cycloid section 3 and tooth top on another screw rod 1
The intersecting point gearing of arc section 2, the root circle section 4 of one of screw rod 1 can be engaged with outside circle segmental arc 2 on another screw rod 1,
The point cycloid section 5 of one of screw rod 1 can be engaged with the wedge angle 28 on another screw rod 1, the node pendulum of one of screw rod 1
Line segment 6 can engage with the wedge angle 1 on another screw rod 1, by above-mentioned fit system rotation when realize two screw rods 1 between
Engagement and sealing, and good sealing effect, it is ensured that the normal operation of screw vacuum pump；Further, point cycloid section 5 and node cycloid
Section 6 can cause that the tooth top band of screw rod 1 is wider using said structure, and tooth top band wider is improved in screw rod 1 and the pump housing
Sealing effectiveness between wall so that curved surface sealing path clearance length is more long, it is to avoid gas is from the tooth top band of screw rod 1 and the pump housing
Pass through between inwall, improve the compression ratio of screw vacuum pump.
Embodiment two
The present embodiment is essentially identical with the structure and principle of embodiment one, and different place is：Cycloid section and tooth top
Cavetto forms arc transition section between arc section, and the radius span of arc transition section is：0~0.2mm.
Specific embodiment described herein is only to the utility model spirit explanation for example.The utility model institute
Category those skilled in the art can make various modifications or supplement or using similar to described specific embodiment
Mode substitute, but without departing from spirit of the present utility model or surmount scope defined in appended claims.
Claims (6)
1. a kind of identical, the oppositely oriented screw rod (1) of screw vacuum pump, including two profiles, the end face of the screw rod (1)
Molded line is by the one section of outside circle segmental arc (2), one section of cycloid section (3), one section of root circle section (4), the one section of point cycloid section that are sequentially connected
(5) constituted with one section of node cycloid section (6), it is characterised in that described cycloid section (5) is the camber line of indent, described cycloid
Rounding off between section (5) and root circle section (4), described cycloid section (5) and node cycloid section (6) are conjugated each other, the section
Point cycloid section (6) is the camber line of evagination, and described cycloid section (5) and node cycloid section (6) intersection form wedge angle one (7), institute
State node cycloid section (6) and form wedge angle two (8) with outside circle segmental arc (2) intersection；
The equation of described cycloid section (5) is：
Wherein Rm is the radius of outside circle segmental arc (2), and Ro is the radius of pitch circle, and β 2 is the corresponding central angle of point cycloid section (5),
The φ ° of initial angle for point cycloid section (5) and node cycloid section (6) joining in coordinate system, t2 is variable, span
The equation of node cycloid section (6) is：
Wherein t1 is variable, span
2. screw vacuum pump according to claim 1, it is characterised in that the corresponding central angle of node cycloid section (6)
It is β 1, the expression equation between β 1 and β 2 is：β 1=β 2=acos (λ -0.125 λ of 0.75 λ+0.375/3), in formula：λ is tooth
The ratio of the radius Rm of tip circle segmental arc (2) and the radius Ro of pitch circle, its value is λ=Rm/Ro, the span of λ for λ ∈ [1.25,
1.65]。
3. screw vacuum pump according to claim 2, it is characterised in that the equation of root circle section (4) is：Wherein Rn is the radius of root circle section (4), and specially Rn=2Ro-Rm, t3 is variable,
1 ° of span t3 ∈ [0, γ 1 °], γ is the corresponding central angle of root circle section (4).
4. screw vacuum pump according to claim 3, it is characterised in that the equation of outside circle segmental arc (2) is：Wherein Rm is the radius of outside circle segmental arc (2), and Rm=2Ro-Rn, t4 are variable, value
2 ° of scope t4 ∈ [0, γ 2 °], γ is the corresponding central angle of outside circle segmental arc (2).
5. screw vacuum pump according to claim 4, it is characterised in that 1 ° of the corresponding central angle γ of root circle section (4) with
2 ° of the corresponding central angle γ of outside circle segmental arc (2) is identical, expression be 1 °=γ of γ, 2 °=π-β 1=π-acos (0.75 λ+
0.375/λ-0.125λ∧3)。
6. screw vacuum pump according to claim 5, it is characterised in that the equation of cycloid section (3) is：Wherein t5 is variable, span t5 ∈ [0, acos (Ro/
Rm)]。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621287005.8U CN206206156U (en) | 2016-11-28 | 2016-11-28 | A kind of screw vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621287005.8U CN206206156U (en) | 2016-11-28 | 2016-11-28 | A kind of screw vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206206156U true CN206206156U (en) | 2017-05-31 |
Family
ID=58748252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621287005.8U Withdrawn - After Issue CN206206156U (en) | 2016-11-28 | 2016-11-28 | A kind of screw vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206206156U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438357A (en) * | 2016-11-28 | 2017-02-22 | 浙江创为真空设备有限公司 | Screw vacuum pump |
-
2016
- 2016-11-28 CN CN201621287005.8U patent/CN206206156U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438357A (en) * | 2016-11-28 | 2017-02-22 | 浙江创为真空设备有限公司 | Screw vacuum pump |
| CN106438357B (en) * | 2016-11-28 | 2018-07-06 | 浙江创为真空设备股份有限公司 | A kind of screw vacuum pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No. 6 Taizhou 317015 Zhejiang 317000 Toumen port Second Avenue Binhai New District Management Committee Patentee 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 Patentee before: ZHEJIANG CHUANGWEI VACUUM EQUIPMENT CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170531 Effective date of abandoning: 20180706 |
|
| AV01 | Patent right actively abandoned |