CN215058170U - Take evacuation system of two sets of lobe pumps - Google Patents
Take evacuation system of two sets of lobe pumps Download PDFInfo
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- CN215058170U CN215058170U CN202121156966.6U CN202121156966U CN215058170U CN 215058170 U CN215058170 U CN 215058170U CN 202121156966 U CN202121156966 U CN 202121156966U CN 215058170 U CN215058170 U CN 215058170U
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Abstract
The utility model relates to the technical field of energy saving and environmental protection, in particular to a vacuum pumping system with two sets of roots pumps, which is provided with a condenser, the low pressure side and the high pressure side of the condenser are connected through a connecting pipeline, two sets of water ring vacuum pumps are arranged on the connecting pipeline, one end of the water ring vacuum pump is connected with the connecting pipeline through the water ring pipeline, the other end of the water ring vacuum pump is communicated with an exhaust port, it is characterized in that two sets of roots pump sets are arranged on a connecting pipeline between the two sets of water ring vacuum pumps, one end of each roots pump set is connected with the connecting pipeline through a roots pipeline, the other end of each roots pump set is communicated with an exhaust port, the energy-saving effect is realized through the two sets of roots pump sets, and the water ring pump has the advantages of simple structure, stable operation of the water ring pump, improvement of the cavitation resistance of the water ring pump, improvement of the operation efficiency, improvement of the vacuum operation, obvious energy-saving effect and the like.
Description
Technical Field
The utility model belongs to the technical field of energy-concerving and environment-protective technique and specifically relates to a simple structure, water ring pump operation are stable, improve the anti cavitation capacity of water ring pump, improve operating efficiency, the vacuum can be opened and improved, energy-conserving effect is obvious take the evacuation system of two sets of lobe pumps.
Background
As is well known, 2-3 water ring vacuum pumps are generally configured in conventional vacuumizing equipment of an introduced 300MW or 600MW wet cooling unit, and the models of the conventional vacuumizing equipment are 2FE 1353 water ring vacuum pumps basically. For a 300MW class wet chiller unit, 2 100% capacity 2FE 1353 water ring vacuum pumps, and for a 600MW class wet chiller unit, 3 50% capacity 2FE 1353 water ring vacuum pumps. The motor and the vacuum pump are directly connected, and when the motor and the vacuum pump are started, the 600MW unit operates in three pumps (the 300MW unit operates in two pumps); in normal operation, the 600MW unit is dual-purpose and one standby (the 300MW unit is one-purpose and one standby). When the unit is started or operated, non-condensable gas collected at the steam chamber sides of the high-pressure condenser and the low-pressure condenser is pumped out to the atmosphere through a water ring vacuum pump. However, the following problems (for illustration purposes, 660MW units are taken as an example) exist:
(1) the water-ring vacuum pump has large margin of output and has electricity-saving space. When a design department designs model selection, the response speed of quick startup (the vacuum value required by startup can be reached within 30 min) and the maximum allowable air leakage are mainly considered as the model selection principle, but when a unit normally operates, a large margin exists in maintaining the vacuum of a system. For example, the model selection of a certain power plant vacuum pump is based on the vacuum tightness of more than 400Pa/min, and the allowance is also considered; but the actual vacuum tightness is about 140 Pa/min; the air leakage of the vacuum system is only 33% of the design level.
(2) The cooling water source of the liquid heat exchanger of the water ring vacuum pump is closed water, and the performance and the output of the water ring vacuum pump are limited by the change of the temperature of working water. Research shows that when the temperature of working water is higher than 35 ℃, the air exhaust capacity is rapidly reduced by 60-80% or more, which is the main reason that some units need to start three vacuum pumps to maintain the vacuum of the condenser in summer.
(3) 2 water-ring vacuum pumps are operated in parallel throughout the year (the current operation current of a motor of each vacuum pump is about 200A), so that the power consumption rate of the vacuum pumps is large and the steam loss of a steam turbine is large.
(4) The air exhaust performance of the water-ring vacuum pump is limited by the change of the temperature of the working water. As the temperature of the working water increases, the corresponding saturation pressure increases. When the suction pressure of the water ring vacuum pump is less than or equal to the saturation pressure corresponding to the temperature of the working fluid, part of the working fluid is vaporized, and the vacuum pump seriously lacks the output force of the vacuum pump because the gas generated by the vaporization of the sucked working fluid occupies the air pumping amount of the vacuum pump.
(5) Along with the rise of the temperature of the working water, the working liquid begins to be gasified, a large amount of steam is generated to form bubbles, cavitation of the water ring vacuum pump is caused, and the impeller generates cracks, so that the safe and efficient operation of the equipment is seriously influenced.
(6) The water ring vacuum pump has low efficiency, which is generally 30-50%.
Disclosure of Invention
The utility model aims at solving the not enough of above-mentioned prior art, provide a simple structure, water ring pump operation are stable, improve the anti cavitation ability of water ring pump, improve operating efficiency, the vacuum can be opened and improved, energy-conserving effect is obvious take the evacuation system of two sets of lobe pumps.
The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides a take evacuation system of two sets of lobe pumps, is equipped with the condenser, is connected through the connecting tube between condenser low pressure side and the high-pressure side, is equipped with two sets of water ring vacuum pumps on the connecting tube, and the one end of water ring vacuum pump is connected with the connecting tube through the water ring pipeline, and the other end of water ring vacuum pump is linked together with the gas vent, is equipped with two sets of roots pump group on the connecting tube between its characterized in that two sets of water ring vacuum pumps, roots pump group's one end be connected with the connecting tube through roots's pipeline, roots pump group's the other end is linked together with the gas vent, realizes energy-conserving effect through two sets of roots pump group.
Roots pump package include roots pump, gas condenser, backing pump, liquid heat exchanger, deareator, roots pump's one end be connected with the connecting tube through roots's pipeline, roots pump's the other end is linked together with gas condenser's air inlet, gas condenser's gas outlet is connected with the import of backing pump, the export of backing pump is linked together with deareator's import, deareator's gas outlet is linked together with the gas vent, deareator's liquid outlet is linked together with liquid heat exchanger's import, liquid heat exchanger's export is linked together with the import of backing pump, gas condenser's the delivery port, liquid heat exchanger's water inlet and delivery port be linked together with closed water system respectively, carry out the heat utilization through gas condenser and liquid heat exchanger.
The water ring pipeline and the Roots pipeline are respectively provided with a manual isolating door and an inlet air control door.
Gas condenser and backing pump between the pipeline on be equipped with elastic tube, destroy vacuum door and check valve, elastic tube, destroy vacuum door and check valve are connected with the pipeline respectively.
The gas-water separator on be equipped with the moisturizing pipe, the moisturizing pipe is linked together with the gas-water separator, is equipped with the moisturizing valve on the moisturizing pipe.
Connecting tube between water ring vacuum pump and the lobe pump, be equipped with the contact valve on the connecting tube between lobe pump and the lobe pump respectively.
The roots pipeline of roots pipeline and connecting tube junction on be equipped with the filter screen that admits air, the filter screen that admits air is connected with roots pipeline.
The water ring vacuum pump is connected with the exhaust port through the gas-water separator.
The utility model discloses owing to adopt above-mentioned structure, have simple structure, the water ring pump operation is stable, improves the anti cavitation erosion ability of water ring pump, improves operating efficiency, the vacuum can be opened and go and improve, energy-conserving effect advantage such as obvious.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a structural schematic diagram of a third roots pump set and a fourth roots pump set in the utility model.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings:
as shown in the attached drawing, a vacuum pumping system with two sets of Roots pumps is provided with a condenser, the low pressure side and the high pressure side of the condenser are connected through a connecting pipeline, two sets of water ring vacuum pumps are arranged on the connecting pipeline, namely a first water ring vacuum pump set 1 and a second water ring vacuum pump set 2 respectively, one ends of the first water ring vacuum pump set 1 and one end of the second water ring vacuum pump set 2 are respectively connected with the connecting pipeline through a water ring pipeline, the other ends of the first water ring vacuum pump set 1 and the second water ring vacuum pump set 2 are respectively communicated with a first exhaust port 5 and a second exhaust port 6 through a first gas-water separator 3 and a second gas-water separator 4, two sets of Roots pump sets are arranged on the connecting pipeline between the first water ring vacuum pump set 1 and the second water ring vacuum pump set 2 and are respectively a third Roots pump set 7 and a fourth Roots pump set 8, one ends of the third Roots pump set 7 and the fourth Roots pump set 8 are respectively connected with the connecting pipeline through a Roots pipeline, the other ends of the third Roots pump set 7 and the fourth Roots pump set 8 are respectively communicated with a third exhaust port and a fourth exhaust port, energy-saving effect is realized through two sets of Roots pump sets, the third Roots pump set 7 and the fourth Roots pump set 8 respectively comprise a Roots pump 9, a gas condenser 10, a backing pump 11, a liquid heat exchanger 12 and a gas-water separator 13, one end of the Roots pump 9 is connected with a connecting pipeline through a Roots pipeline, the other end of the Roots pump 9 is communicated with an air inlet of the gas condenser 10, an air outlet of the gas condenser 10 is connected with an inlet of the backing pump 11, an outlet of the backing pump 11 is communicated with an inlet of the gas-water separator 13, an air outlet of the gas-water separator 13 is communicated with the third exhaust port or the fourth exhaust port, a liquid outlet of the gas-water separator 13 is communicated with an inlet of the liquid heat exchanger 12, and an outlet of the liquid heat exchanger 12 is communicated with an inlet of the backing pump 11, the water outlet of the water inlet of the gas condenser 10, the water inlet and the water outlet of the liquid heat exchanger 12 are respectively communicated with a closed water system, heat utilization is carried out through the gas condenser 10 and the liquid heat exchanger 12, a first manual isolating door 14 and a first inlet air control door 15 are arranged on a water ring pipeline connected with a first water ring type vacuum pump set 1, a second manual isolating door 16 and a second inlet air control door 17 are arranged on a water ring pipeline connected with a second water ring type vacuum pump set 2, an elastic pipe 18, a destructive vacuum door 19 and a check valve 20 are arranged on a pipeline between the gas condenser 10 and a backing pump 11, the elastic pipe 18, the destructive vacuum door 19 and the check valve 20 are respectively connected with the pipeline, a water replenishing pipe 21 is arranged on the gas-water separator 13, the water replenishing pipe 21 is communicated with the gas-water separator 13, a water replenishing valve 22 is arranged on the water replenishing pipe 21, a connecting pipeline between the first water ring type vacuum pump set 1 and a third roots pump set 7 is provided with a connecting valve A, and a connecting pipe between the third roots pump set 7 and the fourth roots pump set 8 is provided with a connecting valve C, a connecting pipe between the fourth roots pump set 8 and the second water ring vacuum pump 2 is provided with a connecting valve B, a roots pipe in the third roots pump set 7 and a roots pipe at the joint of the connecting pipe are provided with a third air inlet filter screen 23, a third manual isolation door 24 and a third inlet air control door 25, and a roots pipe in the fourth roots pump set 8 and a roots pipe at the joint of the connecting pipe are provided with a fourth air inlet filter screen 26, a fourth manual isolation door 27 and a fourth inlet air control door 28.
The roots pump 9, as a main pump of the vacuum pump set, has a large pumping rate at a low inlet pressure, but cannot be used alone, and must be connected in series with the backing pump 11, and the system to be pumped is started when the pressure of the system to be pumped is pumped to an allowable inlet pressure by the backing pump 11. The roots pump 9 is generally of the air-cooled single-stage pump type. The roots pump 9 adopts an air-cooled roots pump 9 with the pumping speed of 1200L/s, and the power of a matched motor is about 45 kW. A cooler is arranged at the lower part of an exhaust port of the roots pump 9, and air pumped by the roots pump 9 enters the pump cavity chamber from two sides after being cooled to cool the rotor and the pump cavity.
The Roots pump 9 and the gas condenser 10 adopt a tube type, the heat load is 45kW, and the cooling area is 40m2The tube side is made of 304 stainless steel, the shell side is made of Q235B, and the cooling water is closed water.
The backing pump 11 is a backing pump 11 of the air-cooled roots pump 9, the backing pump 11 pumps the inlet pressure to the inlet pressure allowed by the air-cooled roots pump 9 (inlet pressure of the roots pump 9 <10 kPa), the air-cooled roots pump 9 is started, and the gas discharged from the air-cooled roots pump 9 is pumped away by the backing pump 11.
The backing pump 11 functions to reduce the discharge pressure of the roots pump 9 so that the inlet of the backing pump 11 is directly connected to the exhaust of the roots pump 9. In order to facilitate installation and connection, ensure reliable sealing and reduce the influence of mechanical vibration on the normal work of the roots pump 9 through a connecting pipeline, a section of elastic pipe 18, namely a metal corrugated pipe, is connected on the connecting pipeline between the roots pump 9 and the backing pump 11.
The backing pump 11 adopts a water ring pump with pumping speed of 1680 m/h, the power of a matched motor is about 45kW, the minimum suction absolute pressure is 3.3kPa, and the requirement of the condenser for ultimate vacuum is met.
The rotor, the disc and the pump shell of the backing pump 11 are made of 304 stainless steel, and the pump is connected with the motor through a coupler. The liquid heat exchanger 12 of the backing pump 11 uses closed water as cooling water.
The above-mentioned gas condenser 10 (also called interstage heat exchanger): is connected with the air-cooled roots pump 9 into a whole and is used for cooling the gas discharged from the roots pump 9 and condensing part of the water vapor discharged from the roots pump 9.
The gas-water separator 13: the gas and the water discharged from the backing pump 11 are separated, the gas is discharged from the gas outlet, and the water is cooled by the liquid heat exchanger 12 through the return pipeline and then flows back to the backing pump 11 for recycling.
The above liquid heat exchanger 12: the circulating working water in the backing pump 11 is cooled, and the working water can be recycled at a lower temperature.
The air inlet filter screen: and impurities such as welding slag and the like carried by gas are filtered at the initial stage of the unit operation.
The inlet of the roots pump 9 is provided with one inlet air control valve, so that the roots pump can be quickly closed when the pump set fails or stops, air is prevented from leaking into the condenser, and the operation of other vacuum pumps is not influenced. Inlet side port size of roots pump 9: DN 250.
The vacuum breaking door 19 is arranged at the exhaust port of the gas condenser 10 of the roots pump 9 and is used for breaking the vacuum of the roots pump 9 group during shutdown so as to prevent the working water of the backing pump 11 from entering the roots pump 9 during shutdown.
The check valve 20 must be installed between the roots pump 9 and the backing pump 11, the oil tank of the roots pump 9 and the air pumping cavity of the backing pump 11 are not completely isolated, and the check valve must be installed in order to prevent circulating water in the pump from entering the oil tank of the roots pump 9 after the backing pump 11 is stopped. The check valve 20 is automatically closed by a back pressure difference.
A manual main water inlet valve 29 and a main water return valve 30 are respectively arranged on the cooling water pipeline from the closed water main pipe to the roots pump 9 group.
The outlet of the Roots pump 9 is connected with a gas condenser 10, the gas condenser 10 is connected with a check valve 20 through an elastic pipe 18, the check valve 20 is connected with the air suction port of the backing pump 11, and the exhaust of the backing pump 11 is connected with a gas-water separator 13.
Two pipelines which are connected with the roots pump 9 group are separately and additionally arranged on the closed type water main pipe and are respectively used for cooling water vapor discharged by the roots pump 9 and working water of the backing pump 11.
The operation flow is as follows:
(1) because the third roots pump set 7 and the fourth roots pump set 8 have certain requirements on inlet pressure before being put into operation, the third roots pump set 7 and the fourth roots pump set 8 cannot be put into operation when the sets are started to establish vacuum. When the unit is started, a conventional A, B water-ring vacuum pump is firstly put into operation according to the original operation mode to establish vacuum: firstly, the manual isolation doors are confirmed to be completely opened, the inlet air control door is closed, and the closed water inlet and return water doors of the liquid heat exchanger 12 of the backing pump 11 and the gas condenser 10 of the roots pump 9 are opened. Then, a first water ring type vacuum pump unit 1 and a second water ring type vacuum pump unit 2 are started in sequence, and when the front-back pressure difference of an inlet air control door of the water ring type vacuum pump is larger than or equal to 3.0kPa, a first inlet air control door 15 and a second inlet air control door 17 are automatically and sequentially opened; and when the vacuum of the condenser is more than or equal to 90.0kPa, the first water-ring type vacuum pump unit 1 and the second water-ring type vacuum pump unit 2 are sequentially closed and put into reserve.
(2) When the unit normally operates, namely the unit reaches 60% (such as 400MW, and the condenser is normal in vacuum), the backing pumps 11 in the third roots pump group 7 and the fourth roots pump group 8 are started to operate; when the inlet pressure of the roots pump 9 is less than 10kPa, the roots pump 9 is started in a combined manner; when the front-back pressure difference of the third inlet air control door 25 of the roots pump 9 is less than 3.0kPa, the third inlet air control door 25 of the pump set is connected, the normal operation of the third roots pump set 7 (on the low-pressure side of the condenser) and the fourth roots pump set 8 (on the high-pressure side of the condenser) is kept, the vacuum is maintained, and the first water-ring type vacuum pump set 1 and the second water-ring type vacuum pump set 2 are put into use.
(3) After the unit is started, after the first water-ring vacuum pump group 1 and the second water-ring vacuum pump group 2 are shut down, if the unit vacuum is not maintained (for example, lower than 90 kPa), 1 of the first water-ring vacuum pump group 1 and the second water-ring vacuum pump group 2 needs to be restarted, and the set of the first water-ring vacuum pump group 1 or the second water-ring vacuum pump group 2 can assist the third roots pump group 7 and the fourth roots pump group 8 to maintain the vacuum of the high-pressure side and the low-pressure side.
(4) When the backing pump 11 in the third roots pump set 7 or the backing pump 11 in the fourth roots pump set 8 is in failure or the inlet pressure of the roots pump 9 is more than 20kPa, the roots pump 9 is tripped; when the roots pump 9 has stopped and the third inlet air control valve 25 or the fourth inlet air control valve 28 in the third roots pump set 7 or the fourth roots pump set 8 has closed and the vacuum break valve has opened, the delay 30s interlock stops the backing pump 11.
(5) When the third roots pump 9 group 7 or the fourth roots pump 8 stops or the equipment is tripped due to faults, the conventional first water-ring vacuum pump 1 or the conventional second water-ring vacuum pump 2 are interlocked and put into operation, and the third inlet air control valve 25 or the fourth inlet air control valve 28 in the third roots pump 7 or the fourth roots pump 8 is automatically closed.
THE ADVANTAGES OF THE PRESENT INVENTION
(1) Because the backing pump 11 is arranged, the suction pressure at the inlets of the backing pump 11 and the roots pump 9 is improved by more than one time, the cavitation resistance of the backing pump 11 is improved, and the efficient and stable operation of the backing pump 11 can be ensured.
(2) One outstanding advantage of the roots pump 9 is its high efficiency, typically 60% to 80%, whereas the water ring vacuum pump efficiency is only 25% to 50%.
(3) The pumping performance of the roots pump 9 is not affected by the change of the temperature of the working water.
(4) The reliability of the vacuum system is greatly improved. Under the conditions of normal operation, stable vacuum and excellent vacuum tightness of the unit, 2 sets of the third Roots pump set 7 and the fourth Roots pump set 8 which are newly added are put into operation to maintain vacuum; the conventional two first water ring type vacuum pump sets 1 and the second water ring type vacuum pump set 2 are used for standby, so that the safety and reliability of a vacuum system are greatly improved.
(5) The power saving effect is obvious. When the third roots pump set 7 and the fourth roots pump set 8 are operated, steam and non-condensable gas are pressurized by the roots pump 9 and then cooled by the gas condenser 10 to enter the backing pump 11. Due to the pressurization of the roots pump 9 and the condensation of the gas condenser 10, water vapor is basically condensed in the gas condenser 10, the latent heat of vaporization is carried away by cooling water of the gas condenser 10, and the gas sucked by the backing pump 11 is basically non-condensable gas, and the quantity of the non-condensable gas is small. Therefore, the electric power of the backing pump 11 can be small, the energy consumption is greatly reduced, and the energy is saved by about 50 percent compared with the vacuum-pumping equipment configured by the original machine.
The technical scheme is adopted to transform 660MW ultra-supercritical double-backpressure units of a power plant, and operation data are shown in table 3 before and after the transformation of a vacuum system is implemented. The current of the two water ring type vacuum pump sets 1 and 2 before modification is 207.0A and 200.7A respectively, the power consumption of the water ring type vacuum pump sets 1 and 2 is 214.7kW, the current of the two roots pump sets 7 and 8 after modification is reduced by 207.0+200.7-68-152=187.7A, the electric power is 110kW, and the saved power is 104.7 kW. According to the annual operation hours, the power consumption is calculated according to 6500h and 0.5 yuan/kWh, and the power saving amount is 104.7kW multiplied by 6500h multiplied by 0.5 yuan/kWh =34.03 ten thousand yuan.
TABLE 1 operational data before and after vacuum pumping system reconstruction
As can be seen from the above table, the coal saving effect is significant. After the installation is finished, the third Roots pump unit 7 and the fourth Roots pump unit 8 are normally put into operation, and when the load is 340-660 MW, the average vacuum value of the condenser is 98kPa, which is more than 1.0kPa higher than the operation vacuum of the two water ring vacuum pumps before the transformation; according to the average load of 480MW, the vacuum degree is improved by 1kPa, the coal consumption rate is reduced by 2.0g/kWh, the standard coal price is 800 yuan/t, and the coal saving benefit increased by the improved vacuum value is 2.0g/kWh multiplied by 1 multiplied by 480MW multiplied by 6500h multiplied by 800 yuan/t =499.2 ten thousand yuan.
The data analysis shows that the third Roots pump unit 7 and the fourth Roots pump unit 8 after modification can meet the normal operation requirement of the unit, the power consumption loss and the coal consumption rate are greatly reduced, and the annual total income of the third Roots pump unit and the fourth Roots pump unit is 533.2 ten thousand yuan. The investment of the reconstruction is about 310 ten thousand yuan, and the investment recovery period is 0.58 year.
Claims (8)
1. The utility model provides a take evacuation system of two sets of lobe pumps, is equipped with the condenser, is connected through the connecting tube between condenser low pressure side and the high-pressure side, is equipped with two sets of water ring vacuum pumps on the connecting tube, and the one end of water ring vacuum pump is connected with the connecting tube through the water ring pipeline, and the other end of water ring vacuum pump is linked together with the gas vent, is equipped with two sets of roots pump group on the connecting tube between its characterized in that two sets of water ring vacuum pumps, roots pump group's one end be connected with the connecting tube through roots's pipeline, roots pump group's the other end is linked together with the gas vent, realizes energy-conserving effect through two sets of roots pump group.
2. The vacuum pumping system with two sets of roots pumps as claimed in claim 1, wherein the roots pump set comprises a roots pump, a gas condenser, a backing pump, a liquid heat exchanger, a gas-water separator, one end of the Roots pump is connected with the connecting pipeline through a Roots pipeline, the other end of the Roots pump is communicated with the air inlet of the gas condenser, the air outlet of the gas condenser is connected with the inlet of the backing pump, the outlet of the backing pump is communicated with the inlet of the gas-water separator, the air outlet of the gas-water separator is communicated with the exhaust port, the liquid outlet of the gas-water separator is communicated with the inlet of the liquid heat exchanger, the outlet of the liquid heat exchanger is communicated with the inlet of the backing pump, and the water outlet of the water inlet of the gas condenser and the water inlet and the water outlet of the liquid heat exchanger are respectively communicated with a closed water system, and heat utilization is carried out through the gas condenser and the liquid heat exchanger.
3. The vacuum pumping system with two sets of roots pumps as claimed in claim 1, wherein the water ring pipeline and the roots pipeline are respectively provided with a manual isolation door and an inlet pneumatic control door.
4. The vacuum-pumping system with two sets of roots pumps as claimed in claim 2, wherein the pipeline between the gas condenser and the backing pump is provided with an elastic tube, a vacuum breaking door and a check valve, and the elastic tube, the vacuum breaking door and the check valve are respectively connected with the pipeline.
5. The vacuum pumping system with two sets of roots pumps as claimed in claim 2, wherein the gas-water separator is provided with a water replenishing pipe, the water replenishing pipe is communicated with the gas-water separator, and the water replenishing pipe is provided with a water replenishing valve.
6. The vacuum pumping system with two sets of roots pumps as claimed in claim 1, wherein the connecting pipeline between the water ring vacuum pump and the roots pump and the connecting pipeline between the roots pump and the roots pump are respectively provided with a communicating valve.
7. The vacuum pumping system with two sets of roots pumps as claimed in claim 1, wherein the roots pipe at the joint of the roots pipe and the connecting pipe is provided with an air inlet filter screen connected with the roots pipe.
8. The vacuum pumping system with two sets of roots pumps as claimed in claim 1, wherein the water ring vacuum pump is connected with the exhaust port through a gas-water separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202121156966.6U CN215058170U (en) | 2021-05-27 | 2021-05-27 | Take evacuation system of two sets of lobe pumps |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121156966.6U CN215058170U (en) | 2021-05-27 | 2021-05-27 | Take evacuation system of two sets of lobe pumps |
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| CN215058170U true CN215058170U (en) | 2021-12-07 |
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| CN202121156966.6U Active CN215058170U (en) | 2021-05-27 | 2021-05-27 | Take evacuation system of two sets of lobe pumps |
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2021
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| TR01 | Transfer of patent right |
Effective date of registration: 20220301 Address after: 264200 No. 58, Haibu Road, economic and Technological Development Zone, Weihai City, Shandong Province Patentee after: HUANENG WEIHAI POWER GENERATION Co.,Ltd. Address before: 264200 No. 666, Fujia South Road, Rongcheng City, Weihai City, Shandong Province Patentee before: National Nuclear demonstration power plant Co.,Ltd. |
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