CN217107434U - Roots liquid ring vacuum pump atmospheric and vacuum combined air exhaust system - Google Patents
Roots liquid ring vacuum pump atmospheric and vacuum combined air exhaust system Download PDFInfo
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- CN217107434U CN217107434U CN202220901099.2U CN202220901099U CN217107434U CN 217107434 U CN217107434 U CN 217107434U CN 202220901099 U CN202220901099 U CN 202220901099U CN 217107434 U CN217107434 U CN 217107434U
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- 239000007788 liquid Substances 0.000 title claims abstract description 78
- 238000005086 pumping Methods 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims description 26
- 238000011010 flushing procedure Methods 0.000 claims description 17
- 210000004907 gland Anatomy 0.000 claims description 4
- 238000005292 vacuum distillation Methods 0.000 abstract description 9
- 238000004821 distillation Methods 0.000 abstract description 6
- 230000006837 decompression Effects 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 4
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000004939 coking Methods 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model provides a roots's liquid ring vacuum pump atmospheric and vacuum combination air exhaust system belongs to decompression distillation technical field, and it is not high that it has solved current pumping speed efficiency to consume technical problem such as the energy is big. This roots liquid ring vacuum pump atmospheric relief combination pumping system, including the precooler, one-level roots pump, second grade roots pump, tertiary roots pump, liquid ring pump and liquid-gas separator, be provided with pressure sensor in the intake pipe of precooler, the precooler passes through the pipeline and is connected with one-level roots pump, one-level roots pump passes through the pipeline and is connected with second grade roots pump, second grade roots pump passes through the pipeline and is connected with tertiary roots pump, tertiary roots pump passes through the pipeline and is connected with the liquid ring pump, the liquid ring pump passes through the pipeline and is connected with liquid-gas separator. The utility model has the advantages of improve roots vacuum pump's pumping speed efficiency and energy-conservation to improve the reliability when the vacuum distillation plant moves in succession.
Description
Technical Field
The utility model belongs to the technical field of the vacuum distillation, a pumping system, especially a roots liquid ring vacuum pump atmospheric and vacuum combination pumping system are related to.
Background
A roots vacuum pump (a roots pump for short), which is a rotary variable-capacity vacuum pump. In the vacuum system, the roots pump is used as a mechanical booster pump because of its large pumping speed within the pressure range of 10-1000 Pa. The Roots pump is widely applied to the metallurgy, petrochemical industry, paper making, food and electronic industry. The Roots vacuum pump has the greatest advantage of higher pumping rate at lower inlet pressure, but it cannot be used alone, and a preceding stage vacuum pump such as a liquid ring vacuum pump, a rotary vane vacuum pump, etc. must be connected in series. When the pressure in the system to be pumped is pumped to the allowable inlet pressure of the Roots vacuum pump by the foreline vacuum pump, the Roots vacuum pump can start to work, and the Roots vacuum pump does not work when the high pressure difference is not allowed, otherwise, the system is overloaded and damaged due to overheating.
Vacuum systems for reduced pressure distillation mostly employ vacuum pump assemblies. At present, the most widely used vacuum pump unit with higher vacuum degree in China is formed by connecting two roots pumps and a vertical oil-free vacuum pump in series, but the pumping speed efficiency of the system is not high, the energy consumption is large, and the roots pumps are only provided with one group, and the continuity of work cannot be ensured when a fault occurs.
SUMMERY OF THE UTILITY MODEL
The utility model aims at having the above-mentioned problem to current technique, provided a roots's liquid ring vacuum pump atmospheric and vacuum combination air exhaust system, the technical problem that this utility model will solve is: how to realize the pumping speed efficiency and energy saving of the Roots vacuum pump and improve the reliability of the vacuum distillation device during continuous operation.
The purpose of the utility model can be realized by the following technical proposal:
the atmospheric and vacuum combined pumping system of the Roots liquid ring vacuum pump comprises a precooler, a first-level Roots pump, a second-level Roots pump, a third-level Roots pump, a liquid ring pump and a liquid-gas separator, wherein a pressure sensor is arranged on an air inlet pipe of the precooler, the precooler is connected with the first-level Roots pump through a pipeline, the first-level Roots pump is connected with the second-level Roots pump through a pipeline, the second-level Roots pump is connected with the third-level Roots pump through a pipeline, the third-level Roots pump is connected with the liquid ring pump through a pipeline, and the liquid ring pump is connected with the liquid-gas separator through a pipeline.
The utility model discloses a theory of operation is: gas enters into one-level roots pump, second grade roots pump, tertiary roots pump and liquefaction pump in proper order through the precooler to realize multistage evacuation compression operation, then send into liquid and gas separation in the liquid-gas separator, through the air-bleed system that three one-level roots pumps and a liquid ring pump are established ties and are constituteed, can satisfy large-traffic decompression distillation demand, further improvement the pumping speed efficiency of roots pump, and energy-concerving and environment-protective.
The one-level lobe pump is provided with three, and three one-level lobe pumps pass through the pipeline and are connected in parallel and pass through the pipeline series with the precooler, and second grade lobe pump, tertiary lobe pump and liquid ring pump all are provided with two, and two second grade lobe pumps pass through the pipeline and are parallelly connected, and two tertiary lobe pumps pass through the pipeline and are parallelly connected, and two parallelly connected second grade lobe pumps pass through the pipeline and are established ties with two parallelly connected tertiary lobe pumps through the pipeline, and two liquid ring pumps also pass through the pipeline and are connected in parallel and establish ties with two parallelly connected tertiary lobe pumps.
Structure more than adopting, make one-level lobe pump, second grade lobe pump, tertiary lobe pump and liquid ring pump all have and prepare the machine, when breaking down, can use and prepare the machine, thereby guarantee the reliability when the vacuum distillation plant moves in succession, one-level lobe pump adopts three main great that the required volume flow rate of one-level lobe pump is bigger, easily damage, the gas of process in the second grade lobe pump is because the vapour of compression pressure grow and atmospheric and vacuum distillation in-process congealability condenses, the volume flow rate reduces, the volume flow rate of the gas of process in the tertiary lobe pump further reduces, the probability of damage is little, so prepare one can.
The pipeline between the precooler and the first-stage roots pump is provided with a first steam flushing valve and a first flow meter, the pipeline between the first-stage roots pump and the second-stage roots pump is provided with a second steam flushing valve and a second flow meter, the pipeline between the second-stage roots pump and the third-stage roots pump is provided with a third steam flushing valve and a third flow meter, and the pipeline between the third-stage roots pump and the liquid ring pump is provided with a fourth flow meter.
By adopting the structure, when the working of the pump is influenced by the coking on the surface of the rotor of the roots pump or the adhesion of the sticky substances, a certain amount of steam can be flushed into the roots pump or the liquid ring pump by utilizing the steam flushing valve to realize the online flushing of the pump cavity, thereby ensuring the normal operation of the pump.
Be provided with first export temperature transmitter on the pipeline between one-level lobe pump and the second grade lobe pump, be provided with second export temperature transmitter on the pipeline between second grade lobe pump and the tertiary lobe pump, be provided with third export temperature transmitter on the pipeline between tertiary lobe pump and the liquid ring pump.
The first heat exchanger is arranged on the discharge port of the first-stage roots pump, the second heat exchanger is arranged on the discharge port of the second-stage roots pump, the third heat exchanger is arranged on the discharge port of the third-stage roots pump, the first heat exchanger is connected with the first liquid discharging valve, the second heat exchanger is connected with the second liquid discharging valve, and the third heat exchanger is connected with the third liquid discharging valve.
And a check valve is arranged on a pipeline between the three-stage roots pump and the liquid ring pump, and a fourth heat exchanger is arranged on a pipeline between the liquid ring pump and the liquid-gas separator.
By adopting the structure, the heat exchanger can be used for carrying out heat exchange on the roots pump and the liquid ring pump, so that various load working conditions of the roots pump and the liquid ring pump are improved.
All be provided with pump chamber and bearing chamber on one-level lobe pump, second grade lobe pump and the tertiary lobe pump, the pump shaft is worn to be equipped with in pump chamber and the bearing chamber, be provided with the bearing between pump shaft and the bearing chamber, the outside of pump shaft is provided with axle sleeve and seal ring cover, seal ring cover is located the junction in pump chamber and bearing chamber, the outside cover of seal ring cover is equipped with the side cap bush, be provided with the piston ring between seal ring cover and the side cap bush, be provided with dry-type seal assembly between side cap bush and the axle sleeve, be provided with the gland fixed with dry-type seal assembly on the side cap bush.
By adopting the structure, the multistage sealing between the pump cavity and the bearing cavity is realized by utilizing the matching of the sealing ring sleeve, the piston ring, the side cover bush and the dry type sealing assembly, and the problem that the service life of the bearing and the gear is influenced by the fact that solution medium is pumped into diluted lubricating oil is avoided.
Compared with the prior art, the atmospheric and vacuum combined pumping system of the Roots liquid ring vacuum pump has the advantages that:
1. gas enters into one-level roots pump, second grade roots pump, tertiary roots pump and liquefaction pump in proper order through the precooler to realize multistage evacuation compression operation, then send into liquid and gas separation in the liquid-gas separator, through the air-bleed system that three one-level roots pumps and a liquid ring pump are established ties and are constituteed, can satisfy large-traffic decompression distillation demand, further improvement the pumping speed efficiency of roots pump, and energy-concerving and environment-protective.
2. When coking or adhesion of stickies on the surfaces of rotors of the roots pump and the liquid ring pump affects the working of the pumps, a certain amount of steam can be flushed into the roots pump and the liquid ring pump by utilizing the steam flushing valve to realize online flushing of pump cavities, so that the normal working is ensured.
3. The first heat exchanger, the second heat exchanger, the third heat exchanger and the fourth heat exchanger can be used for carrying out heat exchange on the roots pump and the liquid ring pump, so that various load working conditions of the roots pump and the liquid ring pump are improved.
4. By utilizing the matching of the sealing ring sleeve, the piston ring, the side cover bushing and the dry type sealing assembly, the multistage sealing between the pump cavity and the bearing cavity is realized, and the problem that the pumped solution medium enters the diluted lubricating oil to influence the service life of the bearing and the gear is avoided.
Drawings
Fig. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a schematic structural diagram of a sealing part of the roots pump in the invention.
In the figure, 1, a pressure sensor; 2. a precooler; 3. a first flow meter; 4. a first steam flush valve; 5. a first-stage roots pump; 6. a first outlet temperature transmitter; 7. a first heat exchanger; 8. a first purge valve; 9. a second flow meter; 10. a second steam flush valve; 11. a second-stage roots pump; 12. a second outlet temperature transmitter; 13. a second heat exchanger; 14. a second purge valve; 15. a third flow meter; 16. a third steam flush valve; 17. a three-stage roots pump; 18. a third outlet temperature transmitter; 19. a third heat exchanger; 20. a third tapping valve; 21. a fourth flow meter; 22. a check valve; 23. a liquid ring pump; 24. a fourth heat exchanger; 25. a liquid-gas separator; 26. a bearing; 27. a shaft sleeve; 28. a sealing gland; 29. a dry seal assembly; 30. a side cover bushing; 31. a piston ring; 32. and (4) sealing the ring sleeve.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
As shown in fig. 1-2, the atmospheric-vacuum combined pumping system of the roots liquid ring vacuum pump comprises a precooler 2, a first-stage roots pump 5, a second-stage roots pump 11, a third-stage roots pump 17, a liquid ring pump 23 and a liquid-gas separator 25, wherein a pressure sensor 1 is arranged on an air inlet pipe of the precooler 2, the precooler 2 is connected with the first-stage roots pump 5 through a pipeline, the first-stage roots pump 5 is connected with the second-stage roots pump 11 through a pipeline, the second-stage roots pump 11 is connected with the third-stage roots pump 17 through a pipeline, the third-stage roots pump 17 is connected with the liquid ring pump 23 through a pipeline, and the liquid ring pump 23 is connected with the liquid-gas separator 25 through a pipeline.
Gas enters into one-level roots pump 5, second grade roots pump 11, tertiary roots pump 17 and the liquefaction pump in proper order through precooler 2 to realize multistage evacuation compression operation, then send into liquid-gas separator 25 in and carry out the liquid-gas separation, through the air-bleed system that three one-level roots pumps 5 and a liquid ring pump 23 series connection are constituteed, can satisfy large-traffic decompression distillation demand, further improvement the pumping speed efficiency of roots pump, and energy-concerving and environment-protective.
One-level lobe pump 5 is provided with three, three one-level lobe pumps 5 are connected in parallel and are established ties through the pipeline with precooler 2 through the pipeline, second grade lobe pump 11, tertiary lobe pump 17 and liquid ring pump 23 all are provided with two, two second grade lobe pumps 11 are connected in parallel through the pipeline, two tertiary lobe pumps 17 are connected in parallel through the pipeline, two parallelly connected second grade lobe pumps 11 pass through the pipeline and establish ties through the pipeline with two parallelly connected tertiary lobe pumps 17, two liquid ring pumps 23 also pass through the pipeline and are connected in parallel and establish ties with two parallelly connected tertiary lobe pumps 17.
Structure more than adopting, make one-level lobe pump 5, second grade lobe pump 11, tertiary lobe pump 17 and liquid ring pump 23 all have and prepare the machine, when breaking down, can use and prepare the machine, thereby guarantee the reliability in the continuous operation of vacuum distillation plant, one-level lobe pump 5 adopts three main great that the required volume flow rate of one-level lobe pump 5 is bigger, easily damage, the gas of process in the second grade lobe pump 11 is because the vapour of compression pressure grow and atmospheric and vacuum distillation in-process condensable condenses, the volume flow rate reduces, the volume flow rate of the gas of process in the tertiary lobe pump 17 further reduces, the probability of damage is little, so one can prepare the machine.
A first steam flushing valve 4 and a first flow meter 3 are arranged on a pipeline between the precooler 2 and the first-stage roots pump 5, a second steam flushing valve 10 and a second flow meter 9 are arranged on a pipeline between the first-stage roots pump 5 and the second-stage roots pump 11, a third steam flushing valve 16 and a third flow meter 15 are arranged on a pipeline between the second-stage roots pump 11 and the third-stage roots pump 17, and a fourth flow meter 21 is arranged on a pipeline between the third-stage roots pump 17 and the liquid ring pump 23.
By adopting the structure, when coking or adhesion of stickies on the surfaces of the rotors of the roots pump and the liquid ring pump 23 affects the working of the pumps, a certain amount of steam can be flushed into the roots pump and the liquid ring pump 23 by utilizing the steam flushing valve to realize online flushing of the pump cavity, thereby ensuring the normal working.
Be provided with first export temperature transmitter 6 on the pipeline between one-level lobe pump 5 and the second grade lobe pump 11, be provided with second export temperature transmitter 12 on the pipeline between second grade lobe pump 11 and the tertiary lobe pump 17, be provided with third export temperature transmitter 18 on the pipeline between tertiary lobe pump 17 and liquid ring pump 23.
The first heat exchanger 7 is arranged on the discharge port of the first-stage roots pump 5, the second heat exchanger 13 is arranged on the discharge port of the second-stage roots pump 11, the third heat exchanger 19 is arranged on the discharge port of the third-stage roots pump 17, the first liquid discharging valve 8 is connected to the first heat exchanger 7, the second liquid discharging valve 14 is connected to the second heat exchanger 13, and the third liquid discharging valve 20 is connected to the third heat exchanger 19.
A check valve 22 is arranged on a pipeline between the three-stage roots pump 17 and the liquid ring pump 23, and a fourth heat exchanger 24 is arranged on a pipeline between the liquid ring pump 23 and the liquid-gas separator 25.
With the above structure, the heat exchanger can be used for heat exchange of the roots pump and the liquid ring pump 23, so that various load working conditions of the roots pump and the liquid ring pump 23 are improved.
Pump cavities and bearing cavities are arranged on the first-stage roots pump 5, the second-stage roots pump 11 and the third-stage roots pump 17, pump shafts penetrate through the pump cavities and the bearing cavities, bearings 26 are arranged between the pump shafts and the bearing cavities, shaft sleeves 27 and sealing ring sleeves 32 are arranged on the outer sides of the pump shafts, the sealing ring sleeves 32 are located at the connecting positions of the pump cavities and the bearing cavities, side cover bushes 30 are sleeved on the outer sides of the sealing ring sleeves 32, piston rings 31 are arranged between the sealing ring sleeves 32 and the side cover bushes 30, dry-type sealing assemblies 29 are arranged between the side cover bushes 30 and the shaft sleeves 27, and sealing glands 28 for fixing the dry-type sealing assemblies 29 are arranged on the side cover bushes 30.
By adopting the structure, the multistage sealing between the pump cavity and the bearing cavity is realized by utilizing the matching of the sealing ring sleeve 32, the piston ring 31, the side cover bush 30 and the dry type sealing assembly 29, and the condition that the pumped solution medium enters the diluted lubricating oil to influence the service life of the bearing 26 and the gear is avoided.
The system has the advantages of high rotating speed, stable volume flow rate in a wider inlet pressure range, small volume and the like, has the characteristics of starting at any pressure and running at any pressure difference, and can be used independently. After the heat exchanger is matched, various load working conditions can be borne, compared with the air pumping system of the steam jet vacuum pump used at present, the steam jet vacuum pump has the characteristics of compact structure, small occupied area, quick start, obvious energy-saving effect and the like which are less than 1/5, and has wide application prospect on a large atmospheric and vacuum distillation device.
The utility model discloses a theory of operation: the gas enters the first-stage roots pump 5, the second-stage roots pump 11, the third-stage roots pump 17 and the liquefaction pump in sequence through the precooler 2, thereby realizing multi-stage vacuum-pumping compression operation, and respectively exchanging heat for the first-stage roots pump 5, the second-stage roots pump 11, the third-stage roots pump 17 and the liquefaction pump by utilizing the first heat exchanger 7, the second heat exchanger 13, the third heat exchanger 19 and the fourth heat exchanger 24, then the liquid and gas are sent into a liquid-gas separator 25 for liquid-gas separation, a certain amount of steam is flushed into the roots pump and the liquid ring pump 23 by utilizing a steam flushing valve at intervals to realize online flushing of the pump cavity, and an air pumping system consisting of three first-stage roots pumps 5 and one liquid ring pump 23 in series is adopted, the requirement of large-flow reduced pressure distillation can be met, the pumping speed efficiency of the Roots pump is further improved, and the device is energy-saving and environment-friendly.
In conclusion, through the setting of one-level roots pump 5, second grade roots pump 11, tertiary roots pump 17 and liquefaction pump, realize improving roots vacuum pump's pumping speed efficiency and energy-conservation to improve the function of the reliability of vacuum distillation plant when continuous operation.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (7)
1. The atmospheric-vacuum combined pumping system of the Roots liquid ring vacuum pump comprises a precooler (2), a first-stage Roots pump (5), a second-stage Roots pump (11), a third-stage Roots pump (17), a liquid ring pump (23) and a liquid-gas separator (25), and is characterized in that a pressure sensor (1) is arranged in an air inlet pipe of the precooler (2), the precooler (2) is connected with the first-stage Roots pump (5) through a pipeline, the first-stage Roots pump (5) is connected with the second-stage Roots pump (11) through a pipeline, the second-stage Roots pump (11) is connected with the third-stage Roots pump (17) through a pipeline, the third-stage Roots pump (17) is connected with the liquid ring pump (23) through a pipeline, and the liquid ring pump (23) is connected with the liquid-gas separator (25) through a pipeline.
2. The atmospheric-vacuum combined pumping system of a Roots liquid ring vacuum pump according to claim 1, wherein three primary Roots pumps (5) are arranged, the three primary Roots pumps (5) are connected in parallel and in series with the precooler (2) through pipelines, two secondary Roots pumps (11), two tertiary Roots pumps (17) and two liquid ring pumps (23) are arranged, the two secondary Roots pumps (11) are connected in parallel through pipelines, the two tertiary Roots pumps (17) are connected in parallel through pipelines, the two parallel secondary Roots pumps (11) are connected in series with the two parallel tertiary Roots pumps (17) through pipelines, and the two liquid ring pumps (23) are also connected in parallel and in series with the two parallel tertiary Roots pumps (17) through pipelines.
3. A roots liquid ring vacuum pump atmospheric-vacuum combined air exhaust system according to claim 2, characterized in that a first steam flushing valve (4) and a first flow meter (3) are arranged on the pipeline between the precooler (2) and the first roots pump (5), a second steam flushing valve (10) and a second flow meter (9) are arranged on the pipeline between the first roots pump (5) and the second roots pump (11), a third steam flushing valve (16) and a third flow meter (15) are arranged on the pipeline between the second roots pump (11) and the third roots pump (17), and a fourth flow meter (21) is arranged on the pipeline between the third roots pump (17) and the liquid ring pump (23).
4. The atmospheric and vacuum combined pumping system of a roots liquid ring vacuum pump as set forth in claim 2, wherein a first outlet temperature transmitter (6) is disposed on the pipeline between the first-stage roots pump (5) and the second-stage roots pump (11), a second outlet temperature transmitter (12) is disposed on the pipeline between the second-stage roots pump (11) and the third-stage roots pump (17), and a third outlet temperature transmitter (18) is disposed on the pipeline between the third-stage roots pump (17) and the liquid ring pump (23).
5. A roots liquid ring vacuum pump atmospheric and vacuum combined pumping system as set forth in claim 2, characterized in that the first heat exchanger (7) is arranged at the outlet of the first-stage roots pump (5), the second heat exchanger (13) is arranged at the outlet of the second-stage roots pump (11), the third heat exchanger (19) is arranged at the outlet of the third-stage roots pump (17), the first liquid discharge valve (8) is connected to the first heat exchanger (7), the second liquid discharge valve (14) is connected to the second heat exchanger (13), and the third liquid discharge valve (20) is connected to the third heat exchanger (19).
6. A roots liquid ring vacuum pump atmospheric and vacuum combined pumping system as set forth in claim 2, characterized in that a check valve (22) is arranged on the pipeline between the three-stage roots pump (17) and the liquid ring pump (23), and a fourth heat exchanger (24) is arranged on the pipeline between the liquid ring pump (23) and the liquid-gas separator (25).
7. The atmospheric-vacuum combined pumping system of the Roots liquid ring vacuum pump as claimed in claim 1, the novel pump is characterized in that a pump cavity and a bearing cavity are arranged on each of the first-stage roots pump (5), the second-stage roots pump (11) and the third-stage roots pump (17), a pump shaft penetrates through the pump cavity and the bearing cavity, a bearing (26) is arranged between the pump shaft and the bearing cavity, a shaft sleeve (27) and a sealing ring sleeve (32) are arranged on the outer side of the pump shaft, the sealing ring sleeve (32) is located at the joint of the pump cavity and the bearing cavity, a side cover bushing (30) is sleeved on the outer side of the sealing ring sleeve (32), a piston ring (31) is arranged between the sealing ring sleeve (32) and the side cover bushing (30), a dry sealing assembly (29) is arranged between the side cover bushing (30) and the shaft sleeve (27), and a sealing gland (28) for fixing the dry sealing assembly (29) is arranged on the side cover bushing (30).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220901099.2U CN217107434U (en) | 2022-04-19 | 2022-04-19 | Roots liquid ring vacuum pump atmospheric and vacuum combined air exhaust system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220901099.2U CN217107434U (en) | 2022-04-19 | 2022-04-19 | Roots liquid ring vacuum pump atmospheric and vacuum combined air exhaust system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217107434U true CN217107434U (en) | 2022-08-02 |
Family
ID=82582397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220901099.2U Expired - Fee Related CN217107434U (en) | 2022-04-19 | 2022-04-19 | Roots liquid ring vacuum pump atmospheric and vacuum combined air exhaust system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217107434U (en) |
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2022
- 2022-04-19 CN CN202220901099.2U patent/CN217107434U/en not_active Expired - Fee Related
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Granted publication date: 20220802 |