US20190309756A1 - Multistage power saving vacuum device with root vacuum pump in first stage - Google Patents

Multistage power saving vacuum device with root vacuum pump in first stage Download PDF

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Publication number
US20190309756A1
US20190309756A1 US16/316,626 US201616316626A US2019309756A1 US 20190309756 A1 US20190309756 A1 US 20190309756A1 US 201616316626 A US201616316626 A US 201616316626A US 2019309756 A1 US2019309756 A1 US 2019309756A1
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Prior art keywords
vacuum
vacuum pump
gas
root
driving
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Abandoned
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US16/316,626
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English (en)
Inventor
Raymond Zhou Shaw
Yi Rong
Bin Wu
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Elivac Co Ltd
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Elivac Co Ltd
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Assigned to ELIVAC, CO., LTD., reassignment ELIVAC, CO., LTD., ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SHAW, Raymond Zhou
Publication of US20190309756A1 publication Critical patent/US20190309756A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0011—Control, e.g. regulation, of pumps, pumping installations or systems by using valves by-pass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F04C23/003—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle having complementary function
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
    • F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/126—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with radially from the rotor body extending elements, not necessarily co-operating with corresponding recesses in the other rotor, e.g. lobes, Roots type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/005—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of dissimilar working principle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/02—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids specially adapted for several pumps connected in series or in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C28/26—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/12—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D31/00—Pumping liquids and elastic fluids at the same time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2220/00—Application
    • F04C2220/10—Vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/81—Sensor, e.g. electronic sensor for control or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/18—Pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/19—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/42—Conditions at the inlet of a pump or machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/44—Conditions at the outlet of a pump or machine

Definitions

  • the present invention relates to vacuum pump systems, in particular to a multistage power saving vacuum device with a root vacuum pump in a first stage.
  • vacuum of a gas condenser has a great effect to consumption of coals in power generation.
  • a promotion of 1 Kpa in vacuum level will induce consumption of the coals to be reduced with a rate of 2.6 g/kWh.
  • Current used gas vacuum devices in fired power plant are water jet vacuum pumps, water ring/liquid ring pumps or steam vacuum pumps, in these vacuum pumps, water is used a working medium. Efficiencies of these vacuum pumps are related to temperature and pressures of water. The efficiencies of these vacuum pumps are very low and difficult to be controlled.
  • operation temperature has a great effect to the quality of a water ring pump, while generally a fired power plant uses nature water sources as cooling water.
  • temperature of water source is affected by climates and seasons.
  • the vacuum of a vacuum pump will be destroyed so that efficiency of pumping gas is reduced quickly to 80% to 90% of the original quality, and thus, the operation efficiency is affected greatly.
  • gas etching will generate, this will destroy the equipments and thus the safety operation will be affected dramatically. Therefore, it is often to use two vacuum pumps to retain the vacuum of the condenser and thus to retain the vacuum efficiency of the whole system, but this cause waste of energy. Therefore, the invention is aimed to provide a new multistage power saving vacuum device with a root vacuum pump for resolving above mention problem.
  • the present invention provides a multistage power saving vacuum device with a root vacuum pump in a first stage, which is used in condenser vacuuming of a fired power plant.
  • a root vacuum pump which has highest efficiency is used in a first stage and then at least one second stage vacuum pump is used to further process the pumping gas so that the gas vented outside is compressed through multiple stages and thus volume of the gas to be vented out has reduced greatly so as to achieve the object of reduction of power consumption.
  • the present invention provides a multistage power saving vacuum device with a root vacuum pump in a first stage comprising a vacuum inlet gas-driving shut-off valve ( 13 ) for receiving non-condensing gas pumping from a power plant condenser; a first root vacuum pump ( 1 ) connected to the vacuum inlet gas-driving shut-off valve for receiving and compressing the gas outputted from the vacuum inlet gas-driving shut-off valve; a second vacuum pump ( 2 ) serially connected to the first root vacuum pump for further compressing the gas from the first root vacuum pump ( 1 ); and when there are more than one second vacuum pumps ( 50 ), all the second vacuum pumps being serially connected.
  • a last stage vacuum pump ( 3 ) connected to the second vacuum pump ( 2 ) for further compressing the gas outputted from the second vacuum pump ( 2 ); and a vapor separator ( 10 ) connected to the last stage vacuum pump ( 3 ) for separating vapor and air; wherein the gas is vented out and the vapor is returned to the last stage vacuum pump ( 3 ).
  • FIG. 1 is an assembly view of components of the invention, where a three stage structure is shown.
  • FIG. 2 is a lateral view of FIG. 1 .
  • FIG. 3 is a rear view of FIG. 1 .
  • FIGS. 1 to 3 the structure of the invention is illustrated. As those shown in FIGS. 1 to 3 , in this the invention, a cooling process of three stages is used as an example for describing the structure of the invention, but the invention is not limited to the three stage structure.
  • the structure of the invention includes the following elements.
  • a vacuum inlet air-driving shut-off valve 13 serves for receiving non-condensing gas sucked from a power plant condenser (not shown).
  • a first root vacuum pump 1 is connected to the vacuum inlet air-driving shut-off valve 13 and serves to receive and compress gas outputted from the vacuum inlet air-driving shut-off valve 13 .
  • the first root vacuum pump 1 comprises the following elements.
  • a first vacuum tube 100 is connected to the vacuum inlet air-driving shut-off valve 13 .
  • the first vacuum tube 100 receives gas from the vacuum inlet air-driving shut-off valve 13 and then the gas thereinwithin is compressed.
  • An inlet gas pressure sensor 11 is positioned at an inlet end of the first vacuum tube 100 for detecting gas pressure at the inlet of the first vacuum tube 100 .
  • a first gas driving device 18 serves for driving gas within the first vacuum tube 100 .
  • the first gas-driving device 18 includes a first frequency adjustable motor 181 having a variable frequency drive (not shown).
  • the first frequency adjustable motor 181 is at an outer side of the first vacuum tube 100 .
  • the frequency of the frequency adjustable motor 181 is adjustable based on requirement of the system.
  • the first gas-driving device 18 further includes a driving mechanism 182 (such as blades).
  • the driving mechanism 182 serves to drive gas within the first vacuum tube 100 . This is known in the prior art and thus the details will not be further described herein.
  • a spiral tubular cooler 7 is positioned in the first vacuum tube 100 .
  • the gas is compressed, then cooled by the spiral tubular cooler 7 and then outputted.
  • a temperature sensor 15 is positioned at an output end of the first vacuum tube 100 for detecting temperature at an outlet end of the first vacuum tube 100 .
  • An gas outlet cooler 8 has an inlet end connected to the spiral tubular cooler 7 for further cooling the gas cooled by the spiral tubular cooler 7 .
  • Non-condensing gas from a power plant is inputted to the first vacuum tube 100 of the first root vacuum pump 1 through the vacuum inlet gas-driving shut-off valve 13 . Then the gas is driven by the first gas-driving device 18 and is compressed in the first root vacuum pump 18 . During compressing, the spiral tubular cooler 7 cools the compressed gas and then the gas is outputted and is further cooled by the gas outlet cooler 8 .
  • a second root vacuum pump 2 is connected to an output end of the gas outlet cooler 8 .
  • the second root vacuum pump 2 serves to receive gas from the first root vacuum pump 18 through the gas outlet cooler 8 and then compresses the gas.
  • the second root vacuum pump 2 includes the following elements.
  • a second vacuum tube 200 is connected to the gas outlet cooler 8 .
  • the gas is compressed in the second vacuum tube 200 .
  • An outlet pressure sensor 12 is positioned at an outlet of the second vacuum tube 200 for detecting gas pressure at the outlet end of the second vacuum tube 200 .
  • a second gas-driving device 19 serves for driving gas within the second vacuum tube 200 .
  • the second gas-driving device 19 includes a second frequency adjustable motor 191 having a variable frequency drive (not shown).
  • the second frequency adjustable motor 191 is at an outer side of the second vacuum tube 200 .
  • the frequency of the frequency adjustable motor 191 is adjustable based on requirement of the system.
  • the second gas-driving device 19 further includes a second driving mechanism 192 (such as blades).
  • the second driving mechanism 192 serves to drive gas within the second vacuum tube 200 . This is known in the prior art and thus the details will not be further described herein.
  • a second spiral tubular cooler 5 is positioned in the second vacuum tube 200 .
  • the gas is compressed, then cooled by the second spiral tubular cooler 5 and then outputted.
  • a second temperature sensor 16 is positioned at an output of the second vacuum tube 200 for detecting temperature at an outlet end of the second vacuum tube 100 .
  • a bypass pressure difference adjusting tube 17 is connected to the second vacuum tube 200 for adjusting the pressure difference in the second vacuum tube 200 .
  • the system opens or closes a gas-driving valve 171 of the bypass pressure difference adjusting tube 17 for adjusting gas pressure difference of the vacuum tube 200 .
  • a second gas outlet cooler 4 has an input end connected to the spiral tubular cooler 5 and further cools gas outputted from the second spiral tubular cooler 5 .
  • Gas outputted from the first gas outlet cooler 8 and the first root vacuum pump 1 is further outputted to the second root vacuum tube 200 of the second root vacuum pump 2 .
  • the gas within the second root vacuum tube 200 is driven by the second gas-driving device 19 and is compressed in the second root vacuum pump 2 and is then cooled by the second spiral tubular cooler 5 .
  • the gas is outputted to the second gas outlet cooler 4 for being further cooled.
  • a pre-driving two-stage liquid ring pump 3 has an inlet end 31 which is connected to the output end 401 of the gas outlet cooler 4 for receiving gas outputted from the second root vacuum pump 2 and then compressed the gas and water in the pre-driving two-stage ring pump 3 to form a mixture of gas and vapor.
  • the pre driving two-stage circulated pump 3 includes a second temperature sensor 14 is positioned at an inlet of the pre driving two-stage ring pump 3 for detecting temperatures at the inlet.
  • a vapor separator 10 has an inlet 101 connected to the pre driving two-stage ring pump 3 .
  • the mixture of gas and vapor in the pre driving two-stage ring pump 3 is inputted to the vapor separator 10 for separating the gas from the vapor.
  • the vapor separator 10 includes a temperature sensor 20 at an output end of the vapor separator 10 for detecting the vapor temperature at the output end of the vapor separator 10 .
  • a circulated liquid heat exchanger 9 has an input end connected to the output end 102 of the vapor separator 10 .
  • An output end of the circulated liquid heat exchanger 9 is connected to the pre driving two-stage circulated pump 3 .
  • the water from the vapor separating from the mixture in the vapor separator 10 is outputted to the circulated liquid heat exchanger 9 for being cooled therein and then returns to the pre driving two-stage circulated pump 3 .
  • the invention further includes an gas-driving valve 21 which is positioned at the circular liquid suction end 31 of the pre driving two-stage circulated pump 3 for controlling water from the vapor separator 10 to the pre driving two-stage circulated pump 3 .
  • the compressed mixture of gas and vapor in the pre driving two-stage circulated pump 3 is inputted to the vapor separator 10 for separating gas from the vapor.
  • the gas separated is drained out from a top end of the vapor separator 10 .
  • the gas after cooled by the gas outlet cooler 4 flows into the pre driving two-stage circulated pump 3 and then is compressed and mixed to form as the mixture of gas and vapor and then the mixture flows into the vapor separator 10 for separating the gas and vapor.
  • the gas is drained out from the top of the vapor separator 10 and the vapor is cooled by the circulated liquid heat exchanger 9 and then returns to the pre driving two-stage circulated pump 3 .
  • the gas drive valve 21 of the pre driving two-stage circulated pump 3 will be opened or closed to pre vent too much circulated liquid of the vapor separator 10 from flowing into the pre driving two-stage circulated pump 3 to induce water returning back or water overflow.
  • FIGS. 1 to 3 a three stage structure of the invention is illustrated.
  • the output and input pressures and temperatures are measured for performing a feedback operation so that the efficiency of the system is promoted.
  • pressures measured by the pressure sensor 11 at the inlet of the first root vacuum pump 1 and the pressures of the input end of the pre driving two-stage circulated pump 3 which is measured by the pressure sensor 12 at the output end of the second root vacuum pump are analyzed.
  • temperatures measured by the temperature sensor 15 in the first root vacuum pump 1 and the temperature sensor 16 in the second root vacuum pump 2 are transferred for analyzing.
  • control signals are transferred to the first frequency adjustable motor 181 and the second frequency adjustable motor 191 so as to adjust rotation speeds of the first frequency adjustable motor 181 and the second frequency adjustable motor 191 . Therefore, the whole system has an optimum and safety operation.
  • the system can open or close the gas-driving valve 171 of the bypass pressure difference adjusting tube 17 of the second root vacuum pump 2 to adjust the pressure difference within the vacuum tube 200 .
  • a three stage structure according to the invention is suitable for this object.
  • a two stage root vacuum pump system according to the invention may be used for a fired power plant with lower capacity having a steam vacuum pump, or a centrifugal vacuum pump which retains a very lower vacuum or total pumping gas is low.
  • the power consumption may have a reduction of 80% as compared with other conventional water ring pumps, steam pumps, centrifugal pumps.
  • the system may have a power saving of 20%-30% as comparing with the original system.
  • the area needed to arranging the structure of the invention is only one fourth of the area used in other conventional water ring pump set or is only 70% of the area used in the gas cooling root vacuum pump.
  • the vacuum for a multiple stage root power saving system is mainly determined by the root vacuum pumps. It is only slightly affected by temperatures. Because the original vacuum system has a larger drainage, it is very possible to further promote the vacuum level of the system, the power saving vacuum system of the invention is more suitable for improving vacuuming of the gas condense of a fired power plant.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
US16/316,626 2016-07-12 2016-07-12 Multistage power saving vacuum device with root vacuum pump in first stage Abandoned US20190309756A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CN201610542660.1 2016-07-12
CN201610542660.1A CN106014997B (zh) 2016-07-12 2016-07-12 一种三级罗茨-水环智能变频控制真空系统及其控制方法
PCT/CN2017/089738 WO2018010536A1 (zh) 2016-07-12 2017-06-23 一种三级罗茨-水环智能变频控制真空系统及其控制方法

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US20190309756A1 true US20190309756A1 (en) 2019-10-10

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US16/316,626 Abandoned US20190309756A1 (en) 2016-07-12 2016-07-12 Multistage power saving vacuum device with root vacuum pump in first stage

Country Status (6)

Country Link
US (1) US20190309756A1 (zh)
CN (1) CN106014997B (zh)
CH (1) CH714092B1 (zh)
DE (1) DE212017000159U1 (zh)
GB (1) GB2568609A (zh)
WO (1) WO2018010536A1 (zh)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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Publication number Priority date Publication date Assignee Title
US11320036B2 (en) 2019-09-23 2022-05-03 Ovg Vacuum Technology (Shanghai) Co., Ltd Transmission structure of motor connection of roots pump
US11339783B2 (en) 2019-09-23 2022-05-24 OVG Vacuum Technology (Shanghai) Co., Ltd. Pump housing structure of three-axis multi-stage Roots pump
US11441564B2 (en) 2019-09-23 2022-09-13 OVG Vacuum Technology (Shanghai) Co., Ltd. Driving structure of three-axis multi-stage roots pump
US11608829B2 (en) 2019-10-10 2023-03-21 OVG Vacuum Technology (Shanghai) Co., Ltd. Structure of rotor connection of multi-axial multi-stage roots pump
US20230096279A1 (en) * 2021-09-27 2023-03-30 Raymond Zhou Shaw Vacuum system having condenser and root vacuum pump set

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CH714092B1 (de) 2021-09-30
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