CN203926013U - A kind of variable pitch dry screw vacuum pump - Google Patents
A kind of variable pitch dry screw vacuum pump Download PDFInfo
- Publication number
- CN203926013U CN203926013U CN201420293028.4U CN201420293028U CN203926013U CN 203926013 U CN203926013 U CN 203926013U CN 201420293028 U CN201420293028 U CN 201420293028U CN 203926013 U CN203926013 U CN 203926013U
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- CN
- China
- Prior art keywords
- screw rod
- driven
- vacuum pump
- variable pitch
- gear
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- Expired - Fee Related
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- Applications Or Details Of Rotary Compressors (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
Abstract
The utility model relates to a kind of variable pitch dry screw vacuum pump, the two ends of the described pump housing are respectively equipped with front shroud and back shroud, the outside of described front shroud is provided with front cover, in the described pump housing, be provided with inner chamber, in described inner chamber, be provided with initiatively screw rod and driven screw rod, the pitch of described active screw rod and driven screw rod increases successively, described active screw rod and driven screw rod mesh by synchromesh gear, wherein initiatively extend outside front cover through front shroud and front cover one end of screw rod, and the both sides of described inner chamber connect respectively suction port and air outlet.The beneficial effects of the utility model are: gas is precompression step by step in pump chamber, thereby have inhibitory action to occurring in the surge of relief opening, make the work of pump more steady, and degree of vacuum is higher, increase pumping efficiency, reduce power consumption, and internal operation temperature reduces.
Description
Technical field
The utility model relates to screw vacuum pump field, relates in particular to a kind of variable pitch dry screw vacuum pump.
Background technique
The working principle of screw vacuum pump is in pump chamber, to be provided with two screw rotors, and rotor is done high-speed reverse rotation by gas compression in pump case, thus the air-extractor of the air-breathing and scavenging action producing.The exhaust ports of existing screw vacuum pump there will be surging phenomenon, causes screw rod not steady when work, has the problems such as running temperature is high, power consumption is large, gettering efficiency is low simultaneously.
Model utility content
The purpose of this utility model is to provide a kind of variable pitch dry screw vacuum pump, to overcome prior art above shortcomings.
The purpose of this utility model is to be achieved through the following technical solutions:
A kind of variable pitch dry screw vacuum pump, comprise the pump housing, the two ends of the described pump housing are respectively equipped with front shroud and back shroud, the outside of described front shroud is provided with front cover, described back shroud seals by bonnet, in the described pump housing, be provided with inner chamber, in described inner chamber, be provided with initiatively screw rod and driven screw rod, described active screw rod and driven screw rod there is variable pitch, the two ends of described active screw rod and driven screw rod are equipped with rolling bearing, one end of described active screw rod is provided with driving gear, described driven screw rod is provided with the driven gear being meshed with driving gear, described driving gear and driven gear are synchromesh gear, wherein initiatively extend outside front cover through front shroud and front cover one end of screw rod, the both sides of described inner chamber connect respectively suction port and air outlet.
Further, the pitch of described active screw rod and driven screw rod reduces successively from suction port to air outlet.
Further, described suction port is located on the center line of distance between shafts of described active screw rod and driven screw rod.
Further, described active screw rod and the driven screw flight number of turns are all at least provided with 4 circles, are preferably 4 or 5 circles.
Further, described driving gear and driven gear are equipped with power lock.
Further, described driving gear and driven gear are helical gear.
Further, described suction port is provided with safety check.
The beneficial effects of the utility model are: gas has compression step by step in pump chamber, thereby has inhibitory action to occurring in the surge of relief opening, makes the work of pump more steady, and degree of vacuum is higher, increases pumping efficiency, reduces power consumption, and internal operation temperature reduces.
Accompanying drawing explanation
With reference to the accompanying drawings the utility model is described in further detail below.
Fig. 1 is the front view of variable pitch dry screw vacuum pump described in the utility model embodiment;
Fig. 2 be in Fig. 1 A-A to sectional view;
Fig. 3 is the plan view of Fig. 1;
Fig. 4 be in Fig. 3 B-B to sectional view.
In figure:
1, the pump housing; 2, front shroud; 3, back shroud; 4, front cover; 5, bonnet; 6, active screw rod; 7, driven screw rod; 8, driving gear; 9, driven gear; 10, suction port; 11, air outlet; 12, safety check; 13, inner chamber.
Embodiment
As Figure 1-4, a kind of variable pitch dry screw vacuum pump described in the utility model embodiment, comprise the pump housing 1, the two ends of the described pump housing 1 are respectively equipped with front shroud 2 and back shroud 3, the outside of described front shroud 2 is provided with front cover 4, described back shroud 3 seals by bonnet 5, in the described pump housing 1, is provided with inner chamber 13, is provided with initiatively screw rod 6 and driven screw rod 7 in described inner chamber 13.
Described active screw rod 6 is equipped with bearing with the two ends of driven screw rod 7, described active screw rod 6 matches with driven screw rod 7, between described active screw rod 6 and driven screw rod 7, do not contact, described active screw rod 6 increases to back shroud 3 from front shroud 2 successively with the pitch of driven screw rod 7, for gas, in transmission, gradually reduce, in pump chamber, have precompression; Described active screw rod 6 is 4 circles with the thread turns of driven screw rod 7, and one end of described active screw rod 6 is connected with motor by coupling with front cover 4 through front shroud 2.
One end of described active screw rod 6 is provided with driving gear 8, described driven screw rod 7 is provided with the driven gear 9 being meshed with driving gear 8, described driving gear 8 be synchromesh gear with driven gear 9, for guaranteeing that active screw rod 6 is not with driven screw rod 7 synchronous rotaries, mutually contact; Described driving gear 8 is equipped with power lock with driven gear 9, for fastening gear, prevents that gear from endwisely slipping at work; Described driving gear 8 is helical gear with driven gear 9, for increasing the area of contact of gear, make the more stable of gear engagement, and helical gear is intermeshing more fastening, and bearing capacity is strong.
The corresponding initiatively position of the maximum pitch end of screw rod 6, the top of the described pump housing 1 is provided with suction port 10, and described suction port 10 is located on the center line of described active screw rod 6 and the distance between shafts of driven screw rod 7, for guaranteeing that gas maximizes in the compression of the pump housing 1; Described suction port 10 is provided with safety check 12, prevents from entering the air return of the pump housing 1, causes decrease in efficiency; The top of described front shroud 2 is provided with air outlet 11, and described air outlet 11 is connected with inner chamber 13.
When vacuum pump work, driven by motor is screw rod 6 High Rotation Speeds initiatively, initiatively screw rod 6 drives driven screw rod 7 and active screw rod 6 synchronous backwards to rotate by synchromesh gear, drive air movement, make air enter through inner chamber 13 and arrive air outlet 11 from suction port 10, because initiatively screw rod 6 reduces gradually with the pitch of driven screw rod 7, the air of equivalent is gradually reduced, in air outlet, 11 places form compression step by step, thereby have prevented surging phenomenon.
The utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but do any variation in its shape or structure; every have identical with a application or akin technological scheme, within all dropping on protection domain of the present utility model.
Claims (7)
1. a variable pitch dry screw vacuum pump, comprise the pump housing (1), the two ends of the described pump housing (1) are respectively equipped with front shroud (2) and back shroud (3), the outside of described front shroud (2) is provided with front cover (4), described back shroud (3) is by bonnet (5) sealing, it is characterized in that: in the described pump housing (1), be provided with inner chamber (13), in described inner chamber (13), be provided with initiatively screw rod (6) and driven screw rod (7), described active screw rod (6) and driven screw rod (7) there is the pitch increasing gradually, described active screw rod (6) is equipped with rolling bearing with the two ends of driven screw rod (7), one end of described active screw rod (6) is provided with driving gear (8), described driven screw rod (7) is provided with the driven gear (9) being meshed with driving gear (8), described driving gear (8) is synchromesh gear with driven gear (9), wherein initiatively extend outside front cover (4) through front shroud (2) and front cover (4) one end of screw rod (6), the both sides of described inner chamber (13) connect respectively suction port (10) and air outlet (11).
2. variable pitch dry screw vacuum pump according to claim 1, is characterized in that: from suction port (10), to air outlet, (11) reduce the pitch of described active screw rod (6) and driven screw rod (7) successively.
3. variable pitch dry screw vacuum pump according to claim 1 and 2, is characterized in that: described suction port (10) is located on the center line of described active screw rod (6) and the distance between shafts of driven screw rod (7).
4. variable pitch dry screw vacuum pump according to claim 1 and 2, is characterized in that: described active screw rod (6) is all at least provided with 4 circles with the thread turns of driven screw rod (7).
5. variable pitch dry screw vacuum pump according to claim 1 and 2, is characterized in that: described driving gear (8) is equipped with power lock with driven gear (9).
6. variable pitch dry screw vacuum pump according to claim 1 and 2, is characterized in that: described driving gear (8) is helical gear with driven gear (9).
7. variable pitch dry screw vacuum pump according to claim 1 and 2, is characterized in that: described suction port (10) is provided with safety check (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420293028.4U CN203926013U (en) | 2014-05-30 | 2014-05-30 | A kind of variable pitch dry screw vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420293028.4U CN203926013U (en) | 2014-05-30 | 2014-05-30 | A kind of variable pitch dry screw vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203926013U true CN203926013U (en) | 2014-11-05 |
Family
ID=51821833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420293028.4U Expired - Fee Related CN203926013U (en) | 2014-05-30 | 2014-05-30 | A kind of variable pitch dry screw vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203926013U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673503A (en) * | 2014-11-25 | 2016-06-15 | 巫修海 | Screw of screw vacuum pump |
| CN106089708A (en) * | 2016-07-29 | 2016-11-09 | 扬州日上真空设备有限公司 | Composite double screw vacuum pump |
| CN107182214A (en) * | 2016-01-15 | 2017-09-19 | 李荣守 | Dry vacuum pump with screw rotor and groove |
| CN112780563A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Two-stage dry vacuum pump |
-
2014
- 2014-05-30 CN CN201420293028.4U patent/CN203926013U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105673503A (en) * | 2014-11-25 | 2016-06-15 | 巫修海 | Screw of screw vacuum pump |
| CN107182214A (en) * | 2016-01-15 | 2017-09-19 | 李荣守 | Dry vacuum pump with screw rotor and groove |
| CN106089708A (en) * | 2016-07-29 | 2016-11-09 | 扬州日上真空设备有限公司 | Composite double screw vacuum pump |
| CN112780563A (en) * | 2019-11-07 | 2021-05-11 | 中国石油化工股份有限公司 | Two-stage dry vacuum pump |
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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: 20141105 Termination date: 20160530 |