CN203308712U - Variable-pitch double-thread screw vacuum pump - Google Patents
Variable-pitch double-thread screw vacuum pump Download PDFInfo
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- CN203308712U CN203308712U CN2013203275543U CN201320327554U CN203308712U CN 203308712 U CN203308712 U CN 203308712U CN 2013203275543 U CN2013203275543 U CN 2013203275543U CN 201320327554 U CN201320327554 U CN 201320327554U CN 203308712 U CN203308712 U CN 203308712U
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Abstract
The utility model relates to a variable-pitch double-thread screw vacuum pump belonging to the field of pumping equipment. The variable-pitch double-thread screw vacuum pump is characterized in that a driving rotor (9) and a driven rotor (10) are a pair of double-thread screw rotors with symmetrical end face lines and opposite helix directions, the driving rotor (9) and the driven rotor (10) are arranged in a pump body (7) in a mutually meshed manner, the thread pitch is gradually reduced from an air suction port to an exhaust port, and along with the synchronous rotation of the driving rotor (9) and the driven rotor (10), gas is compressed gradually and discharged out of the pump body (7) of a pump chamber. The rotors of the variable-pitch double-thread screw vacuum pump are changed to be the variable-pitch double-thread screw rotors, the rotor thread pitch is reduced according to arithmetic progression from the air suction port to the exhaust port, and the variable-pitch double-thread screw vacuum pump has the advantages of being high in air exhaust efficiency, low in air exhaust noise and air exhaust temperature, low in power consumption, balanced in rotor stress and the like.
Description
Technical field
Variable pitch double threaded screw vacuum pump, belong to the pumping equipment field, is specifically related to a kind of vacuum pump.
Background technique
Screw vacuum pump is the vacuum pump that the international developed country of the nineties in last century starts Application in manufacture, has energy-saving and environmental protection, and the advantage that ultimate vacuum is high is called as the green vacuum pump of 21st century.In China, although more late to the understanding of screw vacuum pump, overseas-funded enterprise enters, and the extensive market economy in line with international standards of China, makes the application of screw vacuum pump universal rapidly, and starts to have domestic manufacturer to start to grope to produce.
The modal screw vacuum pump of domestic market, be constant pitch single head rotor screw vacuum pump, and variable pitch single-head screw vacuum pump only has a few offshore company such as the triumphant Buddhist nun of the U.S., German Lay treasured to produce.Constant pitch single-head screw vacuum pump, in the several pitch before exhaust, the pump down volume of screw vacuum pump is fixed, there is no interior compression, just compression in last pitch near relief opening produces, so gas compression heat is high, power consumpiton is large, and exhaust surge and noise are large.Due to only in the end helical pitch generation compression of gas, so the rotor local temperature rise of constant pitch screw vacuum pump, thermal expansion, higher than other positions, very easily cause the fault of vacuum pump " heat expansion is dead ".Moreover the single-head screw rotor is all eccentric in arbitrary cross section, rotor is subjected to pulsatile impact power large in the course of the work, causes noise, serious vibration, has a strong impact on the working life of screw vacuum pump.
Summary of the invention
The technical problems to be solved in the utility model is: overcome the deficiencies in the prior art, it is variable pitch double threaded screw rotor that a kind of rotor is provided, rotor pitch is successively decreased by arithmetic progression from the intakeport to the relief opening, pumping efficiency is high, exhaust sound and delivery temperature is low, power consumpiton is low, the variable pitch double threaded screw vacuum pump of rotor stress balance.
The technological scheme that its technical problem that solves the utility model adopts is: variable pitch double threaded screw vacuum pump, comprise motor, coupling, synchromesh gear, protecgulum, midfeather, the pump housing, bonnet, and power rotor and driven rotor, midfeather and bonnet are separately positioned on pump housing two ends, make pump body form vacuum chamber, it is characterized in that: described power rotor and driven rotor are a pair of profile symmetry, the double threaded screw rotor that rotation direction is opposite, power rotor and driven rotor are intermeshing to be arranged in the pump housing, pitch is diminished to relief opening gradually by intakeport, synchronous rotary along with power rotor and driven rotor, gas is compressed step by step, and the discharge pump chamber is external.
The pitch variation tendency of described double threaded screw rotor is that arithmetic progression successively decreases, and meets following the requirement:
Pn/P1<π/K
Wherein, compression ratio π=1.13, gas constant K=1.4, Pn are relief opening pitch, P1 is intakeport pitch.
The profile that described double threaded screw rotor is every is the conjugate curve that are comprised of involute modified line, small arc-shaped, orthodrome and cycloid, and the molded line at two is symmetrically distributed on circumference.
Described orthodrome is the external diameter profile line of double threaded screw rotor, and described cycloid is the arc curve opposite with involute modified line bending direction, and cycloid is connected with the involute modified line by small arc-shaped, and forms conjugate curve with the orthodrome of external frame.Adopt the part of cycloid as profile, the summit of power rotor and driven rotor line of contact can reach the intersection of rotor and the pump housing, makes the leakage triangle area greatly reduce, and has significantly improved degree of vacuum and the capacity utilization of pump.
Described power rotor and driven rotor are in any one cutting plane perpendicular to axis, and barycenter all is positioned on geometrical center, realizes dynamic balancing.The double threaded screw rotor reaches dynamic balancing, need to not design lightening hole in two ends of rotor.
Compared with prior art, the beneficial effect that has of the utility model is:
1, power rotor and driven rotor are the double threaded screw rotor that a pair of profile is symmetrical, rotation direction is opposite, power rotor and driven rotor are intermeshing to be arranged in the pump housing, pitch is diminished to relief opening gradually by intakeport, synchronous rotary along with power rotor and driven rotor, gas is compressed step by step, and the discharge pump chamber is external, low in energy consumption, noise is little, delivery temperature is low, particularly important to the extraction flammable explosive gas;
2, under identical rate of air sucked in required, rotor diameter is less, and rotor length is shorter, compact structure, and, due to compression in producing, make gas flow velocity in pump chamber fast, dust is difficult for precipitating in pump chamber;
3, variable pitch double threaded screw vacuum pump, rotor temperature rise is little, and is heated evenly, and the rotor matching gap is more accurate, and pumping performance can be controlled, and rotor is stressed evenly simultaneously, long service life;
4, the profile of every of double threaded screw rotor is the conjugate curve that are comprised of involute modified line, small arc-shaped, orthodrome and cycloid, the molded line at two is symmetrically distributed on circumference, power rotor and driven rotor are in any one cutting plane perpendicular to axis, barycenter all is positioned on geometrical center, realize dynamic balancing, need to not design lightening hole at end face, dynamic balancing is more stable, stressed even, the life-span is more permanent;
5, cycloid is as the part of profile, and the summit of power rotor and driven rotor line of contact can reach the intersection of two rotors and the pump housing, makes the leakage triangle area greatly reduce, and rate of air sucked in required is large, and degree of vacuum is high.
The accompanying drawing explanation
Fig. 1 is that the axle of variable pitch double threaded screw vacuum pump of the present utility model cuts open figure.
Fig. 2 is variable pitch double threaded screw rotor engagement figure of the present utility model.
Fig. 3 is variable pitch double threaded screw rotor end-face type of the present utility model.
Fig. 4 is the driving and driven rotor end-face engagement of variable pitch of the present utility model figure.
Wherein: 1, motor 2, coupling 3, synchromesh gear 4, protecgulum 5, fore bearing 6, midfeather 7, the pump housing 8, bonnet 9, power rotor 10, driven rotor 11, rear bearing 12, small arc-shaped 13, orthodrome 14, cycloid 15, involute modified line 16, leakage triangle.
Embodiment
Fig. 1 ~ 4th, most preferred embodiment of the present utility model, be described further below in conjunction with 1 ~ 4 pair of the utility model of accompanying drawing.
With reference to Fig. 1: this variable pitch double threaded screw vacuum pump comprises motor 1, coupling 2, synchromesh gear 3, protecgulum 4, midfeather 6, the pump housing 7, bonnet 8 and power rotor 9 and driven rotor 10.Midfeather 6 and bonnet 8 are separately positioned on the pump housing 7 two ends, make the inner large vacuum chamber that forms of the pump housing 7, on midfeather 6, have relief opening, power rotor 9 and driven rotor 10 are arranged in vacuum chamber, power rotor 9 and driven rotor 10 front and back are supported by fore bearing 5 and rear bearing 11 respectively, and by a pair of synchromesh gear 3 driven rotary, motor 1 connects power rotor 9 by coupling 2, power rotor 9 and driven rotor 10 are a pair of profile symmetry, the double threaded screw rotor that rotation direction is opposite, power rotor 9 and driven rotor 10 are intermeshing to be arranged in the pump housing 7, the pitch curve of power rotor 9 and driven rotor 10 is divided into several little vacuum chambers by large vacuum chamber, the pitch of power rotor 9 and driven rotor 10 is diminished to relief opening gradually by intakeport, synchronous rotary along with power rotor 9 and driven rotor 10, gas is compressed step by step, and discharge outside pump chamber body 7.
With reference to Fig. 2: the pitch variation tendency of double threaded screw rotor is that arithmetic progression successively decreases, and meets following the requirement:
Pn/P1<π/K
Wherein, compression ratio π=1.13, gas constant K=1.4, Pn are relief opening pitch, P1 is intakeport pitch.
With reference to Fig. 3: the profile that the double threaded screw rotor is every is the conjugate curve that are comprised of involute modified line 15, small arc-shaped 12, orthodrome 13 and cycloid 14, the molded line at two is symmetrically distributed on circumference, power rotor 9 and driven rotor 10 are in any one cutting plane perpendicular to axis, barycenter all is positioned on geometrical center, realize dynamic balancing, the double threaded screw rotor reaches dynamic balancing, need to not design lightening hole in two ends of rotor.
With reference to Fig. 4: orthodrome 13 is the external diameter profile line of double threaded screw rotor, cycloid 14 is the arc curve opposite with involute modified line 15 bending directions, cycloid 14 is connected with involute modified line 15 by small arc-shaped 12, and forms conjugate curve with the orthodrome 13 of external frame.Adopt the part of cycloid as profile, the summit of power rotor 9 and driven rotor 10 line of contact can reach the intersection of rotor and the pump housing 7, makes leakage triangle 16 areas greatly reduce, and has significantly improved degree of vacuum and the capacity utilization of pump.
During work, motor 1 drives power rotor 9 rotations by coupling 2, drive by synchromesh gear 3, driven rotor 10 is realized the synchronous backward rotation with it, along with the synchronous rotary of power rotor 9 and driven rotor 10, line of contact is passed toward relief opening gradually, because the pitch of power rotor 9 and driven rotor 10 is diminished to relief opening gradually by intakeport, along with the synchronous rotary of power rotor 9 and driven rotor 10, gas is compressed step by step, and discharges outside pump chamber body 7.
The above, it is only preferred embodiment of the present utility model, be not the utility model to be done to the restriction of other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solutions of the utility model content that do not break away from, to any simple modification, equivalent variations and remodeling that above embodiment does, still belong to the protection domain of technical solutions of the utility model according to technical spirit of the present utility model.
Claims (5)
1. variable pitch double threaded screw vacuum pump, comprise motor (1), coupling (2), synchromesh gear (3), protecgulum (4), midfeather (6), the pump housing (7), bonnet (8), and power rotor (9) and driven rotor (10), midfeather (6) and bonnet (8) are separately positioned on the pump housing (7) two ends, make the inner vacuum chamber that forms of the pump housing (7), it is characterized in that: described power rotor (9) and driven rotor (10) are a pair of profile symmetry, the double threaded screw rotor that rotation direction is opposite, power rotor (9) and driven rotor (10) are intermeshing to be arranged in the pump housing (7), pitch is diminished to relief opening gradually by intakeport, synchronous rotary along with power rotor (9) and driven rotor (10), gas is compressed step by step, and discharge outside pump chamber body (7).
2. variable pitch double threaded screw vacuum pump according to claim 1, it is characterized in that: the pitch variation tendency of described double threaded screw rotor is that arithmetic progression successively decreases, and meets following the requirement:
Pn/P1<π/K
Wherein, compression ratio π=1.13, gas constant K=1.4, Pn are relief opening pitch, P1 is intakeport pitch.
3. variable pitch double threaded screw vacuum pump according to claim 1 and 2, it is characterized in that: the conjugate curve of the profile that described double threaded screw rotor is every for being comprised of involute modified line (15), small arc-shaped (12), orthodrome (13) and cycloid (14), the molded line at two is symmetrically distributed on circumference.
4. variable pitch double threaded screw vacuum pump according to claim 3, it is characterized in that: described orthodrome (13) is the external diameter profile line of double threaded screw rotor, described cycloid (14) is the arc curve opposite with involute modified line (15) bending direction, cycloid (14) is connected with involute modified line (15) by small arc-shaped (12), and forms conjugate curve with the orthodrome (13) of external frame.
5. variable pitch double threaded screw vacuum pump according to claim 1, it is characterized in that: described power rotor (9) and driven rotor (10) are in any one cutting plane perpendicular to axis, and barycenter all is positioned on geometrical center, realizes dynamic balancing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203275543U CN203308712U (en) | 2013-06-07 | 2013-06-07 | Variable-pitch double-thread screw vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203275543U CN203308712U (en) | 2013-06-07 | 2013-06-07 | Variable-pitch double-thread screw vacuum pump |
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| Publication Number | Publication Date |
|---|---|
| CN203308712U true CN203308712U (en) | 2013-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203275543U Expired - Fee Related CN203308712U (en) | 2013-06-07 | 2013-06-07 | Variable-pitch double-thread screw vacuum pump |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952636A (en) * | 2016-05-05 | 2016-09-21 | 扬州大学 | Novel self-lubricating and supporting type variable-volume two-screw pump |
| CN106151031A (en) * | 2016-09-30 | 2016-11-23 | 北京艾岗科技有限公司 | A kind of oil free screw air compressor machine |
| CN106438370A (en) * | 2016-12-07 | 2017-02-22 | 中国石油大学(华东) | Self-balancing variable-pitch cone-shaped screw rotor |
| CN108266373A (en) * | 2017-12-20 | 2018-07-10 | 杭州电子科技大学 | A kind of elastic composite spiral axial pump |
| CN109113991A (en) * | 2018-09-03 | 2019-01-01 | 东北大学 | A kind of vertical rotors for dry double-screw vacuum pump having over-voltage degassing function |
-
2013
- 2013-06-07 CN CN2013203275543U patent/CN203308712U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105952636A (en) * | 2016-05-05 | 2016-09-21 | 扬州大学 | Novel self-lubricating and supporting type variable-volume two-screw pump |
| CN105952636B (en) * | 2016-05-05 | 2017-11-24 | 扬州大学 | The capacity new-type double screw pump of self-lubricating supporting |
| CN106151031A (en) * | 2016-09-30 | 2016-11-23 | 北京艾岗科技有限公司 | A kind of oil free screw air compressor machine |
| CN106438370A (en) * | 2016-12-07 | 2017-02-22 | 中国石油大学(华东) | Self-balancing variable-pitch cone-shaped screw rotor |
| CN106438370B (en) * | 2016-12-07 | 2018-07-06 | 中国石油大学(华东) | A kind of varying pitch conical screw rotor of self-balancing |
| CN108266373A (en) * | 2017-12-20 | 2018-07-10 | 杭州电子科技大学 | A kind of elastic composite spiral axial pump |
| CN108266373B (en) * | 2017-12-20 | 2023-06-30 | 杭州电子科技大学 | Elastic composite spiral axial pump |
| CN109113991A (en) * | 2018-09-03 | 2019-01-01 | 东北大学 | A kind of vertical rotors for dry double-screw vacuum pump having over-voltage degassing function |
| CN109113991B (en) * | 2018-09-03 | 2019-07-23 | 东北大学 | A kind of vertical rotors for dry double-screw vacuum pump having over-voltage degassing function |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131127 Termination date: 20210607 |
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| CF01 | Termination of patent right due to non-payment of annual fee |