CN219317192U - Double-runner Roots liquid ring vacuum pump system - Google Patents
Double-runner Roots liquid ring vacuum pump system Download PDFInfo
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- CN219317192U CN219317192U CN202320858078.1U CN202320858078U CN219317192U CN 219317192 U CN219317192 U CN 219317192U CN 202320858078 U CN202320858078 U CN 202320858078U CN 219317192 U CN219317192 U CN 219317192U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The utility model belongs to the technical field of Roots vacuum pumps, in particular to a double-flow-passage Roots liquid ring vacuum pump system, which comprises a Roots vacuum pump and a liquid ring vacuum pump, wherein a total air inlet is connected with an air inlet of the Roots vacuum pump through a first flow passage, the total air inlet is connected with an air inlet of the liquid ring vacuum pump through a second flow passage, a check valve is arranged between the second flow passage and the liquid ring vacuum pump, an air outlet of the Roots vacuum pump is connected with the check valve, a pressure sensor is arranged at the total air inlet, a first electric control valve is arranged on the first flow passage, a second electric control valve is arranged on the second flow passage, and the pressure sensor, the first electric control valve and the second electric control valve are respectively connected with a control module. The utility model realizes that the sucked gas does not pass through the Roots vacuum pump when the vacuum degree is not high or the vacuum degree is not high, and avoids the problems that the parts of the Roots pump are corroded and damaged by the gas with high humidity and strong corrosiveness or the lubricating oil emulsion fails.
Description
Technical Field
The utility model belongs to the technical field of Roots vacuum pumps, and particularly relates to a double-flow-passage Roots liquid ring vacuum pump system.
Background
The Roots vacuum pump and the liquid ring vacuum pump are connected in series to be used as a common vacuum system, can be used for sucking higher vacuum, and can be connected in series with one to four Roots vacuum pumps for use according to different vacuum requirements of a sucking process, and the Roots liquid ring vacuum pump series unit is widely used in industries such as thermal power generation, pharmacy, semiconductors, chemical industry and the like at present; the Roots vacuum pump is usually produced by casting ductile iron or gray iron, and has the problems that nickel, hastelloy or other anti-corrosion materials can be only permeated on the surface of the overcurrent part when the Roots vacuum pump is used in a corrosion working condition, however, the anti-corrosion means is generally only suitable for dry gas or low-humidity gas; for the gas with high humidity and strong corrosiveness, the problem of corrosion damage of parts or emulsion failure of lubricating oil can occur when the Roots pump is used.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model provides a double-flow-passage Roots liquid ring vacuum pump system, which solves the problem that the Roots pump parts are corroded by high-humidity and high-corrosivity gas. The technical problems to be solved by the utility model are realized by the following technical scheme:
the utility model provides a double-flow-passage Roots liquid ring vacuum pump system, includes Roots vacuum pump and liquid ring vacuum pump, the total air inlet pass through first runner with the air inlet of Roots vacuum pump is connected, the total air inlet passes through the air inlet of second runner and liquid ring vacuum pump and is connected, set up the check valve between second runner and liquid ring vacuum pump, the gas outlet of Roots vacuum pump is connected with the check valve, set up pressure sensor at the total air inlet, set up first automatically controlled valve on first runner, set up the automatically controlled valve of second on the second runner, pressure sensor, first automatically controlled valve and second automatically controlled valve are connected with control module respectively.
Further, the Roots vacuum pump is connected with the first motor.
Further, a liquid ring vacuum pump is connected with the second motor.
Further, the control module is a PLC control module or a DCS control module.
The utility model realizes that the sucked gas does not pass through the Roots vacuum pump when the vacuum degree is not high or the vacuum degree is not high, and avoids the problems that the parts of the Roots pump are corroded and damaged by the gas with high humidity and strong corrosiveness or the lubricating oil emulsion fails.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Detailed Description
Fig. 1 is a schematic diagram of the structure of the present utility model, as shown in fig. 1, a dual-channel Roots liquid ring vacuum pump system, which comprises a Roots vacuum pump 1 and a liquid ring vacuum pump 2, wherein a total air inlet is connected with an air inlet of the Roots vacuum pump 1 through a first channel 3, the total air inlet is connected with an air inlet of the liquid ring vacuum pump 2 through a second channel 4, a check valve 5 is arranged between the second channel 4 and the liquid ring vacuum pump 2, an air outlet of the Roots vacuum pump 1 is connected with the check valve 5, a pressure sensor 6 is arranged at the total air inlet, a first electric control valve 7 is arranged on the first channel 3, a second electric control valve 8 is arranged on the second channel 4, and the pressure sensor 6, the first electric control valve 7 and the second electric control valve 8 are respectively connected with a control module 9.
The Roots vacuum pump 1 is connected with a first motor 10, the liquid ring vacuum pump 2 is connected with a second motor 11, the first motor 10 and the second motor 11 are respectively connected with a control module 9, the control module 9 is a PLC control module or a DCS control module, and the control module 9 of the embodiment is a DCS control module.
A control method of a double-flow-passage Roots liquid ring vacuum pump system comprises the following steps:
step one, presetting the starting pressure Pmin of the Roots vacuum pump 1, wherein the starting pressure Pmin is calculated by the following empirical formula:
Pmin＝S×ΔPmax÷(i-1)；
wherein, the liquid crystal display device comprises a liquid crystal display device,
ΔPmax is the maximum allowable differential pressure of the Roots liquid ring vacuum pump, and is usually 1 KPa-3 KPa;
i is the compression ratio of the Roots liquid ring vacuum pump 2 matched with the backing pump, and is usually 1.5-3;
s is a safety factor, typically 0.5 to 0.8.
And step two, starting the liquid ring vacuum pump 2, wherein the control module 9 controls the second electric control valve 8 to be opened, the first electric control valve 7 is closed, and gas enters the liquid ring vacuum pump 2 through the second flow passage 4 and is discharged.
Step three, the pressure sensor 6 detects the pressure signal Pa of the total air intake, and the pressure sensor 6 transmits the pressure signal Pa to the control module 9.
Fourth, the control module 9 determines the relationship between the pressure signals Pa and Pmin, and performs different operations according to the following two cases:
(1) If Pa is greater than Pmin, the second electric control valve 8 is kept open, the first electric control valve 7 is closed, and the step four is repeated.
(2) If Pa is less than or equal to Pmin, the second electric control valve 8 of the control module 9 is closed, the first electric control valve 7 is controlled to be opened, meanwhile, the Roots vacuum pump 1 is started, at the moment, the Roots vacuum pump 1 and the liquid ring vacuum pump 2 are connected in series for use, higher vacuum degree is formed, the production requirement of a user is met, and the fourth step is repeated.
When the machine is required to be stopped, the control module 9 controls the first electric control valve 7 and the second electric control valve 8 to be closed, then the Roots vacuum pump 1 is stopped, and then the liquid ring vacuum pump 2 is stopped.
Because the Roots liquid ring vacuum pump system has larger water content in the sucked gas when the vacuum degree is not available or is not high, the volume expansion becomes rarefied when the gas pressure is reduced along with the increase of the vacuum degree, the water content of the gas can be obviously reduced, and the higher the vacuum degree is, the closer the vacuum degree is to the dry air.
The Roots vacuum pump 1 is not in a normal production state before being started, but is only in a starting state of equipment, the protected time is not a long time, but is a cause of easy corrosion damage, in the prior art, the Roots vacuum pump is connected with the liquid ring pump vacuum pump in series, no matter whether the Roots vacuum pump is put into use or not, the pumped gas flows through the interior of the Roots vacuum pump as long as the liquid ring pump is started, so that the Roots pump is corroded by corrosive gas with high moisture content; when the utility model is started, the gas passes through the second flow passage 4, so that the corrosive gas with high moisture content is not contacted with the Roots vacuum pump 1, when Pa is less than or equal to Pmin, the gas is reduced from atmospheric pressure to Pa, the atmospheric pressure is assumed to be 1013mbar standard, pa=50 mbar, the gas pressure is obviously reduced, the volume expansion is about 20 times of the original 1013/50, if the gas composition is unchanged, after the volume expansion is 20 times, the liquid content in the gas with the same flow rate is only one twentieth of the original liquid content, the second flow passage 4 is closed, the first flow passage 3 is opened, the Roots vacuum pump 1 is started, and the wet corrosive gas with low liquid content is not easy to cause the corrosion of the Roots vacuum pump.
In a word, the utility model realizes that the sucked gas does not pass through the Roots vacuum pump when the vacuum degree is not high or the vacuum degree is not high, and avoids the problems that the parts of the Roots pump are corroded and damaged or lubricating oil emulsion fails due to the high-humidity and high-corrosivity gas.
Claims (4)
1. The utility model provides a double-flow-passage Roots liquid ring vacuum pump system, its characterized in that includes Roots vacuum pump and liquid ring vacuum pump, total air inlet pass through first runner with the air inlet of Roots vacuum pump is connected, total air inlet pass through the second runner with the air inlet of liquid ring vacuum pump is connected, sets up the check valve between second runner and liquid ring vacuum pump, the gas outlet of Roots vacuum pump with the check valve is connected total air inlet sets up pressure sensor set up first automatically controlled valve on the first runner set up second automatically controlled valve on the second runner, pressure sensor, first automatically controlled valve and second automatically controlled valve are connected with control module respectively.
2. The dual-channel roots liquid ring vacuum pump system of claim 1 wherein the roots vacuum pump is connected to a first motor.
3. The dual-channel roots liquid ring vacuum pump system of claim 1 wherein the liquid ring vacuum pump is connected to a second motor.
4. The dual-channel roots liquid ring vacuum pump system of claim 1, wherein the control module is a PLC control module or a DCS control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320858078.1U CN219317192U (en) | 2023-04-17 | 2023-04-17 | Double-runner Roots liquid ring vacuum pump system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320858078.1U CN219317192U (en) | 2023-04-17 | 2023-04-17 | Double-runner Roots liquid ring vacuum pump system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219317192U true CN219317192U (en) | 2023-07-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320858078.1U Active CN219317192U (en) | 2023-04-17 | 2023-04-17 | Double-runner Roots liquid ring vacuum pump system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219317192U (en) |
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2023
- 2023-04-17 CN CN202320858078.1U patent/CN219317192U/en active Active
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