CN203308711U - Double-thread screw vacuum pump - Google Patents
Double-thread screw vacuum pump Download PDFInfo
- Publication number
- CN203308711U CN203308711U CN2013203274127U CN201320327412U CN203308711U CN 203308711 U CN203308711 U CN 203308711U CN 2013203274127 U CN2013203274127 U CN 2013203274127U CN 201320327412 U CN201320327412 U CN 201320327412U CN 203308711 U CN203308711 U CN 203308711U
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- rotor
- double
- threaded screw
- double threaded
- vacuum pump
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Abstract
The utility model discloses a double-thread screw vacuum pump belonging to the field of vacuum obtaining equipment. The 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 symmetric end molded lines and opposite rotating directions; the driving rotor (9) and the driven rotor (10) are mutually meshed and arranged in a pump body (7); a meshing curve of the driving rotor (9) and the driven rotor (10) is used for dividing a large vacuum chamber into a plurality of small vacuum chambers; and the meshing curve gradually moves towards an exhaust port along with the synchronous rotation of the driving rotor (9) and the driven rotor (10) to exhaust air out of the pump body (7). The double-thread screw rotors of the double-thread screw vacuum pump can realize dynamic balance to the maximum extent, lightening holes do not need to be designed at two ends of the rotors, and the double-thread screw vacuum pump has the advantages of high air exhaust efficiency, low air exhaust noise and temperature and low power consumption.
Description
Technical field
The 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, be a kind of advanced person's vacuum pump.In China, the production of screw vacuum pump is in the stage at the early-stage substantially.
The screw vacuum pump of producing both at home and abroad at present, rotor is the single-head screw rotor, because the single-head screw rotor is seriously eccentric, want to guarantee the dynamic balancing of rotor, must cast lightening hole in two ends of rotor, due to design with cast two aspects, cause the lightening hole of the casting mass eccentricity of balancing rotor to greatest extent, still will be at the rotor outer circle loss of weight of holing in a large number.
No matter be the casting lightening hole of two ends of rotor, or the lightening hole of later stage drilling, mortality harm all can be brought to the normal operation of screw vacuum pump.Because the screw vacuum pump application area is more extensive, polymerization, carbon distribution occur in process gas in pump chamber, and process gas to carry the phenomenon of dust very general, the lightening hole of the lightening hole that two ends of rotor is large and dark and rotor outer circle drilling is the space of providing convenience of accumulating of above-mentioned solid matter, and along with increasing of residue, the original dynamic balancing of rotor is destroyed, the screw vacuum pump vibrations, noise can increase, Frequent Troubles, and greatly reduce working life.
Summary of the invention
The technical problems to be solved in the utility model is: overcome the deficiencies in the prior art, provide that a kind of rotor self can realize to greatest extent that dynamic balancing, pumping efficiency are high, exhaust sound and delivery temperature is low, power consumpiton is low double threaded screw vacuum pump.
The technological scheme that its technical problem that solves the utility model adopts is: this 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 a 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, the pitch curve of power rotor and driven rotor is divided into several little vacuum chambers by large vacuum chamber, synchronous rotary along with power rotor and driven rotor, line of contact is passed toward relief opening gradually, the gas excavationg pump is external.
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, and the double threaded screw rotor often revolves to turn around and can complete the suction and discharge process twice, has pumping speed large, and exhaust is steady, and noise is low, the advantage that the exhaust temperature rise is little;
2, 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;
3, the double threaded screw rotor is because the lightening hole large and dark less than two ends, and the surge while having eliminated suction and discharge and noise amplify, and to make whole rotor be all working surface, and surface finishment is good, so the rotor surface preservative treatment is more thorough, more firm;
4, 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 double threaded screw vacuum pump of the present utility model cuts open figure.
Fig. 2 is double threaded screw rotor engagement figure of the present utility model.
Fig. 3 is double threaded screw rotor end-face type of the present utility model.
Fig. 4 is driving and driven rotor end-face engagement figure of the present utility model.
Fig. 5 is the single-head screw rotor end-face molded line of prior art.
Fig. 6 is the single-head screw rotor end-face lightening hole pattern of prior art.
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 17, lightening hole.
Embodiment
Fig. 1 ~ 4th, most preferred embodiment of the present utility model, be described further below in conjunction with 1 ~ 6 pair of the utility model of accompanying drawing.
With reference to Fig. 1: this 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 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, synchronous rotary along with power rotor 9 and driven rotor 10, line of contact is passed toward relief opening gradually, gas is discharged outside the pump housing 7.
With reference to Fig. 2: the rotor pitch of power rotor 9 and driven rotor 10 is L, and helical pitch is P=2L, and the helical pitch of double threaded screw rotor is 2 times of single head rotor helical pitch, and rate of air sucked in required increases.
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 17 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, makes leakage triangle 16 areas greatly reduce, and has significantly improved degree of vacuum and the capacity utilization of pump.
With reference to Fig. 5,6: the single-head screw rotor c.g. of prior art, not on the geometric center lines of rotor, wants to guarantee the dynamic balancing of rotor, must cast lightening hole 17 in two ends of rotor.
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, and gas is discharged outside the pump housing 7, because power rotor 9 and driven rotor 10 are the double threaded screw rotor that a pair of profile is symmetrical, rotation direction is opposite, often revolving turns around can complete the suction and discharge process twice, and efficiency doubles.
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 (4)
1. 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), the pitch curve of power rotor (9) and driven rotor (10) is divided into several little vacuum chambers by large vacuum chamber, synchronous rotary along with power rotor (9) and driven rotor (10), line of contact is passed toward relief opening gradually, gas is discharged outside the pump housing (7).
2. double threaded screw vacuum pump according to claim 1, 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.
3. double threaded screw vacuum pump according to claim 2, 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.
4. 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 |
|---|---|---|---|
| CN2013203274127U CN203308711U (en) | 2013-06-07 | 2013-06-07 | Double-thread screw vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203274127U CN203308711U (en) | 2013-06-07 | 2013-06-07 | Double-thread screw vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203308711U true CN203308711U (en) | 2013-11-27 |
Family
ID=49614925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203274127U Expired - Fee Related CN203308711U (en) | 2013-06-07 | 2013-06-07 | Double-thread screw vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203308711U (en) |
-
2013
- 2013-06-07 CN CN2013203274127U patent/CN203308711U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131127 Termination date: 20210607 |