CN203081752U - Two-stage Roots pump of dual overflow valves - Google Patents
Two-stage Roots pump of dual overflow valves Download PDFInfo
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- CN203081752U CN203081752U CN 201320042486 CN201320042486U CN203081752U CN 203081752 U CN203081752 U CN 203081752U CN 201320042486 CN201320042486 CN 201320042486 CN 201320042486 U CN201320042486 U CN 201320042486U CN 203081752 U CN203081752 U CN 203081752U
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Abstract
The utility model belongs to the technical field of vacuum, and specifically relates to a two-stage Roots pump of a dual-stage overflow valve. The two-stage Roots pump comprises a motor and a pump body, wherein the pump body is internally provided with a pair of driving rotor shaft and driven rotor shaft, which are arranged in parallel, the driving rotor shaft is connected with the motor, the pump body comprises a front pump body and a rear pump body, and a gas channel is arranged on a wall on which the front pump body is connected with the rear pump body; pump cavities of the front and rear pump bodies are internally provided with a pair of rotors, each pair of rotors are mutually perpendicularly installed on the driving rotor shaft and the driven rotor shaft, and the front pump body and the rear pump body are both provided with air inlet ends and air outlet ends; and each pump body is internally provided with a channel communicated with the air inlet ends and the air outlet ends, the channel is internally provided with the overflow valves, and the rear pump body is provided with a side port communicated with a front-stage pump. The two-stage Roots pump can be directly started under atmosphere by arranging the dual overflow valves, the front-stage pump does not need to wait, the load of the front-stage pump can not be too large so as to avoid damaging the pump or the motor, the operation is convenient and rapid, and the suction efficiency of a vacuum unit is improved.
Description
Technical field
The utility model relates to a kind of twin-stage Roots pump of double overflow valve, belongs to the vacuum technique field.
Background technique
Roots pump is a kind of long-pending formula vacuum pump of rotary volume-variable that does not have interior compression.Be made of two rotors on the pair of parallel axle that is contained in the pump housing, shaft end gear drives run-in synchronism.In recent years, Roots pump has obtained in fields such as petrochemical industry, metallurgy, papermaking, food and electron trades using widely.Because Roots pump generally can not use separately, need the series connection fore pump, connect into the unit form.In order to make unit obtain higher degree of vacuum, fore pump often connect two or three Roots pumps, have in addition connect four, not only taken big quantity space, also increased the cost of equipment and maintenance cost in the future.The release of twin-stage Roots pump just well solves these problems, simplified the unit form, but the twin-stage Roots pump can not under atmospheric pressure directly start, must be extracted into higher degree of vacuum (about 1000Pa-2000Pa) to system by fore pump could start, and twin-stage Roots pump porting pressure reduction can not too high (about 3000Pa-6000Pa), otherwise can cause the fore pump load excessive, these problems are restricting promoting the use of of twin-stage Roots pump.
The model utility content
According to above deficiency of the prior art, the technical problems to be solved in the utility model is: a kind of directly startup under atmospheric pressure, simple operation are provided and can improve the twin-stage Roots pump of the double overflow valve of vacuum machine assembly air-exhausting efficient.
The twin-stage Roots pump of double overflow valve described in the utility model, comprise the motor and the pump housing, the power rotor axle that pair of parallel is installed is set in the pump housing, the driven rotor axle, the power rotor axle connects motor, the power rotor axle, assemble the driving gear that is meshed on the driven rotor axle respectively, driven gear, the pump housing and the back pump housing before the pump housing comprises, before, the wall of back pump housing contact is provided with air flue, before, a pair of rotor is set respectively in the pump chamber of the back pump housing, every pair of orthogonal being installed on power rotor axle and the driven rotor axle of rotor, the preceding pump housing, inlet end and exhaust end all are set on the back pump housing, all be provided with the connection inlet end in each pump housing, the passage of exhaust end, relief valve is installed in the passage, the side mouth that is communicated with fore pump is set on the back pump housing.
During work, the gas of the exhaust end of pump housing discharge enters the inlet end of the back pump housing by air flue in the past, arrange to the fore pump of connecting by the exhaust end of the back pump housing again with the twin-stage Roots pump, when fore pump can not in time be discharged these gases, cause the pressure reduction of back pump housing exhaust end and inlet end to raise, when pressure reduction is higher than the weight of relief valve valve body of the back pump housing, relief valve in the back pump housing is opened, gas reenters in the twin-stage Roots pump, in the pump housing of back, pass through the relief valve self-loopa, extracted out gradually by fore pump up to these gases, the relief valve of the preceding pump housing has same effect.
The beneficial effect that the utility model is compared with prior art had is:
This twin-stage Roots pump can under atmospheric pressure directly start by the double overflow valve is set, and need not wait for its fore pump, and can not cause damage to pump or motor because of the fore pump load is excessive, and it is more convenient to operate, and has improved the pumping efficiency of vacuum unit.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the generalized section of the preceding pump housing;
Fig. 3 is the generalized section of the back pump housing.
Among the figure: 1, motor; 2, the preceding pump housing; 3, rotor; 4, the back pump housing; 5, relief valve; 6, relief valve; 7, pump chamber; 8, exhaust end; 9, air flue; 10, passage; 11, inlet end; 12, exhaust end; 13, side mouth; 14, passage; 15, driven rotor axle; 16, inlet end; 17, power rotor axle; 18, pump chamber.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described further:
Shown in Fig. 1 ~ 3, the twin-stage Roots pump of double overflow valve, comprise the motor 1 and the pump housing, the power rotor axle 17 that pair of parallel is installed is set in the pump housing, driven rotor axle 15, power rotor axle 17 connects motor 1, power rotor axle 17, assemble the driving gear that is meshed on the driven rotor axle 15 respectively, driven gear, the pump housing 2 and the back pump housing 4 before the pump housing comprises, before, the wall of back pump housing contact is provided with air flue 9, before, the pump chamber 7 of the back pump housing, a pair of rotor 3 is set respectively in 18, every pair of rotor 3 orthogonal being installed on power rotor axle 17 and the driven rotor axle 15, on the preceding pump housing 2 inlet end 11 is set, exhaust end 8 and the path 10 that is communicated with inlet end 11 and exhaust end 8, relief valve 6 is installed in the path 10, the side mouth 13 that is communicated with fore pump is set on the back pump housing 4, inlet end 16, exhaust end 12 and the passage 14 that is communicated with inlet end 16 and exhaust end 12 are installed relief valve 5 in the passage 14.
During work, be evacuated the inlet end 11 of gas by the preceding pump housing in the system, through rotor rotated in the preceding pump housing 2, the exhaust end 8 of the pump housing before being discharged to, exhaust end seals, gas can be along the direction of arrow indication, by preceding, air flue 9 on the wall of back pump housing contact enters the inlet end 16 of the back pump housing, under the turning effort of the back pump housing 4 rotors, gas is finally arranged to exhaust end 12, and pass through side mouth 13 rows to the fore pump of connecting with the twin-stage Roots pump, if the gas of twin-stage Roots pump compression is too much, fore pump can't in time be extracted out, will cause the back pump housing exhaust end 12 and the pressure reduction of inlet end 16 to raise, when pressure reduction is higher than the weight of relief valve valve body of the back pump housing 4, relief valve 5 in the back pump housing 4 is opened, and gas reenters in the twin-stage Roots pump, passes through relief valve 5 self-loopas in the pump housing 4 of back, extracted out gradually by fore pump up to these gases, the relief valve 6 of the preceding pump housing has same effect.
This twin-stage Roots pump has all designed relief valve on former and later two pump housings, under atmospheric pressure can directly start, need not wait for its fore pump, and can not cause damage to pump or motor because of the fore pump load is excessive, it is more convenient to operate, and has improved the pumping efficiency of vacuum unit.
Claims (1)
1. the twin-stage Roots pump of a double overflow valve, comprise the motor (1) and the pump housing, it is characterized in that: the power rotor axle (17) that pair of parallel is installed is set in the pump housing, driven rotor axle (15), power rotor axle (17) connects motor (1), power rotor axle (17), assemble the driving gear that is meshed on the driven rotor axle (15) respectively, driven gear, the pump housing comprises the preceding pump housing (2) and the back pump housing (4), before, the wall of back pump housing contact is provided with air flue (9), before, a pair of rotor (3) is set respectively in the pump chamber of the back pump housing, every pair of orthogonal being installed on power rotor axle (17) and the driven rotor axle (15) of rotor, before, inlet end and exhaust end all are set on the back pump housing, all be provided with the connection inlet end in each pump housing, the passage of exhaust end, relief valve is installed in the passage, and the back pump housing (4) is gone up the side mouth (13) that is communicated with fore pump is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320042486 CN203081752U (en) | 2013-01-25 | 2013-01-25 | Two-stage Roots pump of dual overflow valves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320042486 CN203081752U (en) | 2013-01-25 | 2013-01-25 | Two-stage Roots pump of dual overflow valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203081752U true CN203081752U (en) | 2013-07-24 |
Family
ID=48827594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320042486 Expired - Fee Related CN203081752U (en) | 2013-01-25 | 2013-01-25 | Two-stage Roots pump of dual overflow valves |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203081752U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320917A (en) * | 2021-12-06 | 2022-04-12 | 兰州空间技术物理研究所 | Straight-line roots pump |
| CN114413042A (en) * | 2021-12-08 | 2022-04-29 | 兰州空间技术物理研究所 | Free counterweight type overflow valve |
-
2013
- 2013-01-25 CN CN 201320042486 patent/CN203081752U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320917A (en) * | 2021-12-06 | 2022-04-12 | 兰州空间技术物理研究所 | Straight-line roots pump |
| CN114320917B (en) * | 2021-12-06 | 2024-06-04 | 兰州空间技术物理研究所 | In-line Roots pump |
| CN114413042A (en) * | 2021-12-08 | 2022-04-29 | 兰州空间技术物理研究所 | Free counterweight type overflow valve |
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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 |
Granted publication date: 20130724 Termination date: 20160125 |
|
| EXPY | Termination of patent right or utility model |