CN206458603U - A kind of bilobal rotor assembly of Roots vaccum pump - Google Patents
A kind of bilobal rotor assembly of Roots vaccum pump Download PDFInfo
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- CN206458603U CN206458603U CN201621492257.4U CN201621492257U CN206458603U CN 206458603 U CN206458603 U CN 206458603U CN 201621492257 U CN201621492257 U CN 201621492257U CN 206458603 U CN206458603 U CN 206458603U
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- segmental arc
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- roots vaccum
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Abstract
The utility model provides a kind of bilobal rotor assembly of Roots vaccum pump, belongs to vacuum pump technology field.It solves the more low technical problem of compression ratio that existing Roots vaccum pump is obtained.The bilobal rotor assembly of this Roots vaccum pump includes two profile identical rotors, the profile of rotor is made up of the segment type line segment of identical four, adjacent molded line section mirror image is set, seamlessly transitted between adjacent molded line section, each molded line section is smooth curve, each molded line section is by the outside circle segmental arc being sequentially connected, cylindrical segmental arc, conjugate curves section and tooth root arc section composition, outside circle segmental arc and tooth root arc section are circular arc line, the center of circle of outside circle segmental arc and the center of circle of tooth root arc section are overlapped, the identical corresponding central angle of outside circle segmental arc central angle corresponding with tooth root arc section is α.The utility model has the advantages that to cause Roots vaccum pump to obtain higher compression ratio.
Description
Technical field
The utility model belongs to vacuum pump technology field, is related to a kind of Roots vaccum pump, particularly a kind of Roots vaccum pump
Bilobal rotor assembly.
Background technology
Roots vaccum pump is a kind of rotary fluid machinery, is synchronized by 2 roots rotors for being capable of mutually cluck conjunction
Incorgruous dual AC power motion, produces vacuum in suction side, pressure differential is formed, so as to realize the suction and discharge of gas.Roots rotor
Composition molded line and its conjugation meshing characteristic to the area utilization of rotor and sealing property, the operational efficiency shadow of Roots vaccum pump
Sound is very big, therefore the reasonable design of roots rotor molded line is vital.
The two ends head width of the rotor of current Roots vaccum pump is smaller, the band for causing two ends of rotor head to be formed
Narrower, sealing during rotor operation between pump case is poor, and gas backflow amount is big, the compression ratio for causing Roots vaccum pump to obtain
It is relatively low.
The content of the invention
The purpose of this utility model is there is above mentioned problem for existing technology, it is proposed that a kind of turn of Roots vaccum pump
Sub-component, the technical problem that the utility model is solved is so that Roots vaccum pump obtains higher compression ratio.
The purpose of this utility model can be realized by following technical proposal：
A kind of bilobal rotor assembly of Roots vaccum pump, including two profile identical rotors, the rotor
Profile is made up of the segment type line segment of identical four, and the adjacent molded line section mirror image is set, it is characterised in that the adjacent molded line
Seamlessly transitted between section, each molded line section is smooth curve, each molded line section is by the tooth being sequentially connected
Tip circle segmental arc, cylindrical segmental arc, conjugate curves section and tooth root arc section composition, the outside circle segmental arc and tooth root arc section are circle
Camber line, the center of circle of the outside circle segmental arc and the center of circle of tooth root arc section are overlapped, the corresponding central angle of outside circle segmental arc and tooth root
The identical corresponding central angle of arc section is α.
Four segment type line segments, four segment type line segment corresponding with another rotor respectively when rotating on one of rotor
Outside circle segmental arc on engagement, one of rotor is engaged with the tooth root arc section on another rotor, on one of rotor
Cylindrical segmental arc and another rotor on conjugate curves section；The profile of the rotor of the structure cause two ends of rotor head compared with
Width, that is, the band that two ends of rotor head is formed are wider, and preferably, gas is returned sealing during rotor operation between pump case
Flow is few so that rotor operation can cause Roots vaccum pump obtains higher compression when preferable under higher differential pressure
Pumping efficiency.
In the bilobal rotor assembly of above-mentioned Roots vaccum pump, the central angle alpha of the outside circle segmental arc for α ∈ [0,
π/8].α value causes that two ends of rotor head is wider in the case where ensureing the engagement of two rotors within the range, improves and turns
Sealing between son and pump case, therefore Roots vaccum pump can be caused to obtain higher compression when preferable pumping efficiency.
In the bilobal rotor assembly of above-mentioned Roots vaccum pump, the relational expression of outside circle segmental arc and outside circle segmental arc
For：Rm+Rn=2Ro, wherein Rm are the radius of outside circle segmental arc, and Rn is the radius of tooth root arc section, and Ro is the pitch circle half of rotor
Footpath.The structure causes that two ends of rotor head is wider in the case where ensureing the engagement of two rotors so that Roots vaccum pump is obtained
Higher compression when preferable pumping efficiency.
In the bilobal rotor assembly of above-mentioned Roots vaccum pump, the corresponding central angle of the cylindrical segmental arc and conjugation are bent
The corresponding central angle of line segment is identical.The structure causes that two ends of rotor head is wider in the case where ensureing the engagement of two rotors,
So that Roots vaccum pump obtains higher compression when preferable pumping efficiency.
In the bilobal rotor assembly of above-mentioned Roots vaccum pump, the cylindrical segmental arc and outside circle segmental arc are tangent, outside
The center of circle of arc section is apart from b to molded lines of rotor center：B=(Rm2-Ro2)/(2*Rm-2*Rocos (π/4- α)), external arc
Section radius rn be：rn=Rm-b.The structure causes that two ends of rotor head is wider in the case where ensureing the engagement of two rotors,
So that Roots vaccum pump obtains higher compression when preferable pumping efficiency.
In the bilobal rotor assembly of above-mentioned Roots vaccum pump, the rectangular equation formula of the conjugate curves section
For：In formula：T1 is variable, span t1 ∈ [0, β], and β is common
The corresponding central angle of yoke curved section, β is β=pi/2-α；θ is t1 dependent variable, and relational expression is：Tg θ=(bsin2t1-
Rosint1)/(bcos2t1-Rocost1)。
The structure causes that two ends of rotor head is wider in the case where ensureing the engagement of two rotors so that Roots vaccum pump
Obtain higher compression when preferable pumping efficiency.
Compared with prior art, the bilobal rotor assembly of this Roots vaccum pump have Roots vaccum pump obtain it is higher
Compress the advantage of when preferable pumping efficiency.
Brief description of the drawings
Structural representation when Fig. 1 is the profile engagement of two rotors.
Fig. 2 is the flow chart of different engagements during two rotors are rotated one week.
In figure, 1, molded line section；2nd, outside circle segmental arc；3rd, cylindrical segmental arc；4th, conjugate curves section；5th, tooth root arc section
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.
As shown in figure 1, the bilobal rotor assembly of Roots vaccum pump includes two profile identical rotors, rotor
Profile is made up of the segment type line segment 1 of identical four, and 1 mirror image of adjacent molded line section is set, smoothed between adjacent molded line section 1
Cross, each molded line section 1 is smooth curve, each molded line section 1 by the outside circle segmental arc 2 being sequentially connected, cylindrical segmental arc 3,
Conjugate curves section 4 and tooth root arc section 5 are constituted, and outside circle segmental arc 2 and tooth root arc section 5 are circular arc line, outside circle segmental arc 2
The center of circle and the center of circle of tooth root arc section 5 are overlapped, the corresponding central angle of outside circle segmental arc 2 and the corresponding central angle of tooth root arc section 5
Identical is α, and the central angle alpha of outside circle segmental arc 2 is α ∈ [0, π/8].The relational expression of outside circle segmental arc 2 and outside circle segmental arc 2
For：Rm+Rn=2Ro, wherein Rm are the radius of outside circle segmental arc 2, and Rn is the radius of tooth root arc section 5, and Ro is the pitch circle of rotor
Radius.
The corresponding central angle of cylindrical segmental arc 3 and the conjugation corresponding central angle of curved section 4, identical cylindrical segmental arc 3 and outside circle
Segmental arc 2 is tangent, and the center of circle of cylindrical segmental arc 3 is apart from b to molded lines of rotor center：B=(Rm2-Ro2)/(2*Rm-2*Rocos(π/
4- α)), the radius r of cylindrical segmental arc 3nFor：rn=Rm-b.
Conjugate curves section 4 rectangular equation formula be：Formula
In：T1 is variable, and span t1 ∈ [0, β], β is conjugate curves 4 corresponding central angles of section, and β is β=pi/2-α；θ is t1's
Dependent variable, relational expression is：Tg θ=(bsin2t1-Rosint1)/(bcos2t1-Rocost1).
As shown in Fig. 2 four segment type line segments 1 when rotating on one of rotor are corresponding with another rotor respectively
Four segment type line segments 1 are engaged, and the outside circle segmental arc 2 on one of rotor is engaged with the tooth root arc section 5 on another rotor, its
In the cylindrical segmental arc 3 on a rotor and the conjugate curves section 4 on another rotor；The profile of the rotor of the structure causes
Two ends of rotor head is wider, that is, the band that two ends of rotor head is formed is wider, close between pump case during rotor operation
Preferably, gas backflow amount is few for envelope property so that rotor operation can cause Roots vaccum pump is obtained higher under higher differential pressure
Compress when preferable pumping efficiency.
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 bilobal rotor assembly of Roots vaccum pump, including two profile identical rotors, the end of the rotor
Face molded line is made up of the segment type line segment (1) of identical four, and adjacent described molded line section (1) mirror image is set, it is characterised in that adjacent described
Seamlessly transitted between molded line section (1), each molded line section (1) is smooth curve, each molded line section (1) by
Outside circle segmental arc (2), cylindrical segmental arc (3), conjugate curves section (4) and tooth root arc section (5) composition being sequentially connected, the tooth top
Arc section (2) and tooth root arc section (5) are circular arc line, the center of circle of the outside circle segmental arc (2) and the circle of tooth root arc section (5)
The heart is overlapped, and the identical corresponding central angle of outside circle segmental arc (2) central angle corresponding with tooth root arc section (5) is α.
2. the bilobal rotor assembly of Roots vaccum pump according to claim 1, it is characterised in that the outside circle segmental arc
(2) central angle alpha is α ∈ [0, π/8].
3. the bilobal rotor assembly of Roots vaccum pump according to claim 2, it is characterised in that outside circle segmental arc (2)
Relational expression with outside circle segmental arc (2) is：Rm+Rn=2Ro, wherein Rm are the radius of outside circle segmental arc (2), and Rn is tooth root circular arc
The radius of section (5), Ro is the pitch radius of rotor.
4. the bilobal rotor assembly of the Roots vaccum pump according to claim 1 or 2 or 3, it is characterised in that described cylindrical
The corresponding central angle of segmental arc (3) central angle corresponding with conjugation curved section (4) is identical.
5. the bilobal rotor assembly of the Roots vaccum pump according to claim 1 or 2 or 3, it is characterised in that described cylindrical
Segmental arc (3) and outside circle segmental arc (2) are tangent, and the center of circle of cylindrical segmental arc (3) is apart from b to molded lines of rotor center：B=(Rm2-
Ro2)/(2*Rm-2*Rocos (π/4- α)), the radius r of cylindrical segmental arc (3)nFor：rn=Rm-b.
6. the bilobal rotor assembly of the Roots vaccum pump according to claim 1 or 2 or 3, it is characterised in that the conjugation
The rectangular equation formula of curved section (4) is：In formula：T1 is change
Amount, span t1 ∈ [0, β], β is the corresponding central angle of conjugate curves section (4), and β is β=pi/2-α；θ is t1 dependent variable,
Relational expression is：Tg θ=(bsin2t1-Rosint1)/(bcos2t1-Rocost1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621492257.4U CN206458603U (en) | 2016-12-31 | 2016-12-31 | A kind of bilobal rotor assembly of Roots vaccum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621492257.4U CN206458603U (en) | 2016-12-31 | 2016-12-31 | A kind of bilobal rotor assembly of Roots vaccum pump |
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| Publication Number | Publication Date |
|---|---|
| CN206458603U true CN206458603U (en) | 2017-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621492257.4U Active CN206458603U (en) | 2016-12-31 | 2016-12-31 | A kind of bilobal rotor assembly of Roots vaccum pump |
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| CN (1) | CN206458603U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762654A (en) * | 2016-12-31 | 2017-05-31 | 浙江创为真空设备有限公司 | A kind of bilobal rotor assembly of Roots vaccum pump |
| CN114658654A (en) * | 2022-03-04 | 2022-06-24 | 中科仪(南通)半导体设备有限责任公司 | Novel roots rotor molded lines |
-
2016
- 2016-12-31 CN CN201621492257.4U patent/CN206458603U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106762654A (en) * | 2016-12-31 | 2017-05-31 | 浙江创为真空设备有限公司 | A kind of bilobal rotor assembly of Roots vaccum pump |
| CN114658654A (en) * | 2022-03-04 | 2022-06-24 | 中科仪(南通)半导体设备有限责任公司 | Novel roots rotor molded lines |
| CN114658654B (en) * | 2022-03-04 | 2023-08-15 | 中科仪(南通)半导体设备有限责任公司 | Roots rotor |
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| Date | Code | Title | Description |
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| 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. |
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| CP01 | Change in the name or title of a patent holder |