CN104878163B - Water ring pump-steam jet pump pipeline system with automatic pressure regulating function - Google Patents
Water ring pump-steam jet pump pipeline system with automatic pressure regulating function Download PDFInfo
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- CN104878163B CN104878163B CN201510264197.4A CN201510264197A CN104878163B CN 104878163 B CN104878163 B CN 104878163B CN 201510264197 A CN201510264197 A CN 201510264197A CN 104878163 B CN104878163 B CN 104878163B
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Abstract
The invention relates to the field of steel-making vacuum refining process and provides a water ring pump-steam jet pump pipeline system with an automatic pressure regulating function. The water ring pump-steam jet pump pipeline system comprises a vacuum chamber and a waste gas extraction mechanism, wherein the vacuum chamber is provided with a gas guiding pipe; the waste gas extraction mechanism comprises first steam pump components and water ring pump components; the first steam pump components comprise at least two first steam pumps; the water ring pump components comprise water ring pumps positioned between an exhaust opening and the first steam pump components. The water ring pump-steam jet pump pipeline system further comprises a pressure regulating device which comprises a gas inlet pipe and a pressure regulating valve, wherein one end of the gas inlet pipe is communicated with the gas guiding pipe; the connecting part of the gas guiding pipe and the gas inlet pipe is located on the gas guiding pipe between the second first steam pump and the vacuum chamber. According to the pipeline system, when the pumps are sequentially stopped in the waste gas flowing direction, the pressure regulating device can supply external gas for the gas guiding pipe to enable the inlet pressure of the gas guiding pipe at all the pumps to be within the required pressure range, so that the water ring pumps are prevented from generating relatively big vibration and noise in the pump stopping process.
Description
Technical field
The present invention relates to make steel vacuum refining process field, more particularly to it is a kind of can automatic Regulation water ring pump-steam spray
Penetrate the pipe-line system of pump.
Background technology
Vacuum refining is used as steel industry production high-end product, improve production efficiency, abundant steel products species and reduction
The indispensable important step of production cost.For many years vacuum pump has been used up vapor jet vacuum pump to steel liquid vacuum refining system
System.Under steel industry energy-saving and emission-reduction, the pressure of cost efficiency, application of the water ring pump in molten steel Vacuum Field is more and more wider
General, water ring pump is increasingly becoming the capital equipment in the transformation of vapor jet vacuum pump, but water ring pump-Steam Ejector System is being stopped
During pump, water ring pump produces high vibration and noise, therefore how to weaken the vibration during water ring pump termination of pumping and noise
Become particularly significant.
The content of the invention
It is an object of the invention to provide it is a kind of can automatic Regulation water ring pump-steam jet pump pipe-line system, it is intended to
Larger vibration and noise are easily produced for solving existing water ring pump-Steam Ejector System water ring pump during termination of pumping
Problem.
What the present invention was realized in：
The present invention provide it is a kind of can automatic Regulation water ring pump-steam jet pump pipe-line system, including vacuum chamber and
For extracting the exhaust extraction mechanism of the vacuum indoor exhaust air to air vent, be provided with the gas outlet of the vacuum chamber for
Derive the airway of the vacuum indoor exhaust air to the air vent, the exhaust extraction mechanism include the first steam pump group part with
And water ring pump group part, the first steam pump group part includes at least two first steam pumps that are sequentially communicated, and each described first steams
Heat pump is sequentially connected in series on the airway, and the water ring pump group part includes the water ring pump being series on the airway, and institute
State water ring pump to be located between the air vent and the first steam pump group part, also including pressure regulating device, the pressure regulating device bag
Include the air inlet pipe that one end is in communication with the outside and the pressure regulator valve being arranged in the air inlet pipe, the other end of the air inlet pipe and institute
Airway connection is stated, and the junction between the airway and the air inlet pipe is located at second described the along waste gas flow direction
On the airway between one steam pump and the vacuum chamber.
Further, the pressure regulating device also includes the pressure transducer being arranged on the airway, and the pressure is passed
Sensor is located on the airway between second first steam pump and the vacuum chamber of waste gas flow direction and described
Pressure transducer is electrically connected with the pressure regulator valve.
Specifically, the pressure transducer is located at first first steam pump and the vacuum chamber along waste gas flow direction
Between the airway on.
Specifically, the junction between the airway and the air inlet pipe is located at second described the along waste gas flow direction
On the airway between one steam pump and first first steam pump.
Further, it is provided with master control on the airway between the first steam pump group part and the vacuum chamber
Valve, the pressure regulating device is respectively positioned on side of the main control valve away from the vacuum chamber with the junction of the airway.
Further, the exhaust extraction mechanism also includes at least one condensing tower and corresponds with the condensing tower
Spray assemblies, each condensing tower sequentially turned on to the air vent, by the first steam pump group part expellant gas according to
It is secondary in each condensing tower, the water ring pump is with condensing tower is connected wherein described in one.
Further, in the second steam pump group part, the previous condensing tower are also in series with described in adjacent two between condensing tower
Second steam pump group part described in interior gas Jing is entered in the latter condensing tower, and the water ring pump steams with described in one of which second
Heat pump modules in parallel.
Specifically, the second steam pump group part includes at least one second steam pumps, each second steam
Each described second steam pump of pump group part is connected with condensing tower described in adjacent two.
Specifically, the exhaust extraction mechanism includes three first steam pumps being sequentially connected in series and is sequentially connected in series
Two second steam pumps, the water ring pump is arranged in parallel with latter described second steam pump flowed to along waste gas.
Further, the pressure regulating device also includes the stop valve being arranged in the air inlet pipe, and the stop valve is located at
Between the end that the pressure regulator valve and the air inlet pipe are in communication with the outside.
The invention has the advantages that：
The pipe-line system of the present invention, airway should be assigned everywhere certain pressure during work, and work as after vacuum chamber closing, and
During exhaust extraction mechanism normal work, air inlet pipe is closed, and when first the first steam pump termination of pumping is flowed to along waste gas, air inlet pipe
Open, pressure regulator valve opens corresponding angle so that outside air can be entered in airway until along waste gas flow direction along air inlet pipe
Second the first steam pump at the pressure that distributes when being work of the inlet pressure of airway, and then can ensure that water ring pump both sides
Air pressure maintain relative equilibrium, when continuing second the first steam pump termination of pumping that will be flowed to along waste gas, pressure regulator valve opens certain angle
Degree so that air inlet pipe guide tracheal strips supplement outside air so that at latter first steam pump or at water ring pump airway entrance
Distribution pressure when pressure is work, now water ring pump answer termination of pumping produce noise and vibration it is also smaller, to this along waste gas stream
To termination of pumping successively, water ring pump remains less noise and vibration, and effect is clearly.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 be it is provided in an embodiment of the present invention can automatic Regulation water ring pump-steam jet pump pipe-line system structure
Schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is all other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 1, it is provided in an embodiment of the present invention it is a kind of can automatic Regulation water ring pump-steam jet pump pipeline system
System, for vacuum refining steel products, including vacuum chamber 1 and exhaust extraction mechanism 2, arrange at the gas outlet of vacuum chamber 1
There is airway 11, the waste gas in vacuum chamber 1 can be extracted to air vent by airway 11 in the presence of exhaust extraction mechanism 2
At 111, refinement exhaust extraction mechanism 2, it includes the first steam pump group part 21 and water ring pump group part 22, by the first steam pump
Waste gas in the mating reaction extracting vacuum room 1 of component 21 and water ring pump group part 22, the first steam pump group part 21 includes at least two
Individual first steam pump 211, each first steam pump 211 is sequentially connected in series on airway 11, and water ring pump group part 22 includes series connection
Water ring pump 221 on airway 11, and water ring pump 221 is located at the inducing QI between the steam pump group part 21 of air vent 111 and first
On pipe 11, i.e., the waste gas after the work of the first steam pump group part 21 in airway 11 can the effect of Jing water ring pumps 221 drain into aerofluxuss
It is in parallel for water ring pump group part 22 can also be included between two water ring pumps 221, and the two water ring pumps 221 at mouth 111
Arrange, the waste gas that the first steam pump group part 21 is extracted can two water ring pumps 221 of Jing individually act on and draining at air vent 111；
Pipe-line system also includes pressure regulating device 3, and pressure regulating device 3 includes air inlet pipe 31 and pressure regulator valve 32, the one end of air inlet pipe 31 with it is outer
Boundary connect, it is also possible to be connected directly at air vent 111, its other end is connected with airway 11, and airway 11 with enter
Junction between trachea 31 is located at the airway 11 between second first steam pump 211 and vacuum chamber 1 of waste gas flow direction
On, pressure regulator valve 32 is arranged in air inlet pipe 31, and the inlet air flow in air inlet pipe 31 can be controlled by the open angle of pressure regulator valve 32
Amount.In the present invention, pipe-line system operationally, i.e., using in the extracting vacuum room 1 of exhaust extraction mechanism 2 during waste gas, air inlet pipe 31
To close, now certain pressure is assigned with airway 11 and each pump of exhaust extraction mechanism 2, such as along waste gas flow direction
The inlet pressure of airway 11 is P at first the first steam pump 2111, airway 11 enters at second the first steam pump 211
Mouth pressure is P2, the like ... .., the inlet pressure of airway 11 at water ring pump 221 can be set as Pn, when vacuum chamber 1 is closed
After closing, during the equal normal work of each pump, air inlet pipe 31 also in closed mode, if during first the first 211 termination of pumping of steam pump, should
Adjust pressure regulator valve 32 angle, can from air inlet pipe 31 to airway 11 in supplement outside air, and then with maintain second first
Air pressure at steam pump 211 is P2, follow-up the first steam pump 211 or water ring pump 221 are carried out termination of pumping by continuation successively, by entering
Trachea 31 continues to supplement outside air into airway 11, and outside air can be along 11 Jing of airway, second the first steam pump 211
Fill to latter first steam pump 211 or at water ring pump 221, by that analogy, so that airway 11 enters at water ring pump 221
Mouth pressure is Pn, then the both sides of water ring pump 221 will not produce excessive pressure differential, it remains less during termination of pumping
Vibration or noise, the drop for comparing traditional water ring pump-steam jet pump extraction waste gas mechanism is shaken with noise reduction clearly.
Optimization above-described embodiment, pressure regulating device 3 also includes pressure transducer 33, and the pressure transducer 33 is arranged at inducing QI
On pipe 11, for testing the air pressure of airway 11 at corresponding position, specially pressure transducer 33 is arranged at along waste gas
On airway 11 between second first steam pump 211 and vacuum chamber 1 of flow direction, while by the pressure transducer 33 and pressure regulation
Valve 32 is electrically connected with.In the present embodiment, pressure transducer 33 is mainly used for determining second the first steam pump 211 and vacuum chamber
The inlet pressure of airway 11 between 1, when first the first 211 termination of pumping of steam pump, it can determine second the first steam
The inlet pressure of airway 11 at pump 211, and when second the first 211 termination of pumping of steam pump, due to the first steam pump 211 with lead
The conduction of trachea 11, then its can determine at latter first steam pump 211 airway at airway 11 or water ring pump 221 again
Pressure at 11, the pressure information that pressure transducer 33 is determined it is transferred to pressure regulator valve 32, and then can control pressure regulator valve
32 open corresponding angle, and air inlet pipe 31 supplements outside air into airway 11 until pressure transducer 33 surveys site pressure
For pressure of the time-division with setting that works, such as the airway 11 at second the first steam pump 211 of measure of pressure transducer 33
During inlet pressure, then outside air should be supplemented until the pressure value that pressure transducer 33 is determined is P2, it is very convenient.Take one more excellent
Scheme, pressure transducer 33 is arranged at the airway 11 between first first steam pump 211 and vacuum chamber 1 of waste gas flow direction
On, to this when the equal normal work of each pump, what pressure transducer 33 was determined is airway 11 at first the first steam pump 211
Inlet pressure P1, and when first the first 211 termination of pumping of steam pump, it then determines inducing QI at second the first steam pump 211 again
The inlet pressure of pipe 11, the like.
The prioritization scheme of junction between airway 11 and air inlet pipe 31 is taken, the junction is located at second along waste gas flow direction
On airway 11 between individual first steam pump 211 and first the first steam pump 211.In the present embodiment, when first first
During 211 termination of pumping of steam pump, then need to be supplemented at second the first steam pump 211 outside air to maintain the gas of airway 11 at this
Press as P2, outside air directly can be supplemented at second the first steam pump 211 from the junction, and when second first steaming
During 211 termination of pumping of heat pump, outside air can be along airway 11 and through second the first steam pump 211 to latter first steam pump
211 or water ring pump 221 at.Main control valve 112 is generally additionally provided with airway 11, for controlling the break-make of airway 11, is entered
And the closing to the folding of vacuum chamber 1 is realized, and pressure regulating device 3 should be respectively positioned on the main control valve 112 with each junction of airway 11
It is located on the airway 11 between pressure transducer 33 and vacuum chamber 1 away from the side of vacuum chamber 1, i.e. main control valve 112.This enforcement
Example in, after main control valve 112 is opened, exhaust extraction mechanism 2 work can be with the waste gas in extracting vacuum room 1 to air vent 111 at,
Otherwise after main control valve 112 is closed, then can effectively reduce water ring successively to each first steam pump 211 and the termination of pumping of water ring pump 221
The noise and vibration that pump 221 is produced, and when pressure regulating device 3 supplements outside air into airway 11, by main control valve 112
Cut-off effect, its also will not along airway 11 enter vacuum chamber 1 in.Accordingly, one is also equipped with air inlet pipe 31
Stop valve 34, the stop valve 34 is located between the end that pressure regulator valve 32 and air inlet pipe 31 are in communication with the outside.It is normal in pipe-line system
During work, stop valve 34 closes air inlet pipe 31, and before main control valve 112 is closed, stop valve 34 is opened to ensure pressure regulator valve 32
After opening, outside air can be entered smoothly in airway 11.
Further, exhaust extraction mechanism 2 also includes at least one condensing tower 23 and corresponds with each condensing tower 23
Spray assemblies 231, each condensing tower 23 sequentially turned on to air vent 111, and by corresponding each first steam pump group part 21
The waste gas of discharge is sequentially entered in each condensing tower 23, and water ring pump 221 is connected with a wherein condensing tower 23.Specifically, take out in waste gas
In taking mechanism 2, along waste gas flow direction, each condensing tower 23 is sequentially located between the steam pump group part 21 of air vent 111 and first, i.e., and first
The waste gas that steam pump group part 21 is extracted is sequentially entered in each condensing tower 23, then by the spray assemblies 231 in each condensing tower 23
It is sprayed so that steam liquefied, so that waste gas has only been discharged at air vent 111, without containing substantial amounts of steam, entering
And reduce exhaust extraction load.
Optimization above-described embodiment, is also serially connected with the second steam pump group part 24 between two adjacent condensing towers 23, previous
The corresponding second steam pump group parts 24 of waste gas Jing in condensing tower 23 enter latter condensing tower 23 in, for water ring pump 221 then with
Second steam pump group part 24 of one of which is in parallel, and water ring pump 221 be connected to the second steam of group pump group part 24 it is same
On condensing tower 23, air vent 111 can be drained into by the component of the second steam pump group part 24 by the waste gas that the condensing tower 23 is discharged to this,
Can also be extracted to air vent 111 by water ring pump 221.In the present embodiment, the waste gas after acting on Jing the first steam pump group part 21
Into in previous condensing tower 23, gas is entered in one second steam pump group part 24, in the second steam pump group Jing after cooling liquid
Enter in latter condensing tower 23 after the extraction again of part 24.Further, for include per one second steam pump group part 24 to
Few second steam pump 241, is then that parallel connection sets between each second steam pump 241 when the second steam pump 241 has multiple
Put, while being series between corresponding two condensing towers 23.When having multiple second steam pumps per one second steam pump group part 24
When 241, then generally two, two the second steam pumps 241 are serially connected between two condensing towers 23 being disposed adjacent, while two
Second steam pump 241 is parallel connection, i.e., there are the air-flow in previous condensing tower 23 two passages to enter in latter condensing tower 23, and two
It is non-interference between individual passage, with relative independence, strengthen the mobility of gas, and one second steam pump wherein
When 241 appearance are damaged, another second steam pump 241 can ensure that the unobstructed of exhaust flow path.
A preferred embodiment is taken, exhaust extraction mechanism 2 includes three the first steam pumps, 211, two the second steam pump group parts
24th, a water ring pump 221 and three condensing towers 23, three the first steam pumps 211 are sequentially connected in series, per one second steam pump group part
24 have only included second steam pump 241, and along waste gas flow direction, first the second steam pump 241 is located at first condensing tower 23
Between second condensing tower 23, second the second steam pump 241 be located at second condensing tower 23 and the 3rd condensing tower 23 it
Between, while water ring pump 221 is connected with second condensing tower 23, second the second steam pump 241 is in parallel with water ring pump 221.This reality
In applying example, exhaust extraction mechanism 2 forms Pyatyi steam pump, and along waste gas flow direction, pipe-line system distributes pressure when working, first the
The inlet pressure of airway 11 is P at one steam pump 2111, the inlet pressure of airway 11 is at second the first steam pump 211
P2, the inlet pressure of airway 11 is P at the 3rd the first steam pump 2113, airway 11 at first the second steam pump 241
Inlet pressure is P4, the inlet pressure of airway 11 is P at second the second steam pump 2415, while the inducing QI at water ring pump 221
The inlet pressure of pipe 11 is also P5(now P5As above-mentioned Pn).After main control valve 112 is closed, when the termination of pumping of first the first steam pump 211
When, pressure regulating device 3 supplements the entrance of outside air to airway 11 at second the first steam pump 211 into airway 11 automatically
Pressure is P2；When first the first steam pump 211 and second the first 211 equal termination of pumping of steam pump, the automatic guide of pressure regulating device 3
The inlet pressure that outside air to airway 11 at the 3rd the first steam pump 211 is supplemented in trachea 11 is P3；When each first steaming
During 211 equal termination of pumping of heat pump, pressure regulating device 3 supplements outside air to first the second steam pump 241 into airway 11 automatically
The inlet pressure of airway 11 is P4；When each first steam pump 211 and first the second 241 equal termination of pumping of steam pump, pressure regulation
Mechanism 3 supplement the inlet pressure of outside air to airway 11 at second the second steam pump 241 into airway 11 automatically with
And the inlet pressure of airway 11 is P at water ring pump 2215.During above-mentioned termination of pumping, termination of pumping successively is flowed to along waste gas, together
When pressure regulating device 3 pressure regulator valve 32 automatically open up gradually into airway 11 supplement outside air so that pressure transducer 33 is examined
The pressure of survey is the distribution pressure of the entrance everywhere of airway 11 so that water ring pump 221 both sides will not during termination of pumping
Excessive pressure differential is formed, is entered without producing larger noise and vibration.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvements made etc. should be included within the scope of the present invention.
Claims (8)
1. it is a kind of can automatic Regulation water ring pump-steam jet pump pipe-line system, including vacuum chamber and described for extracting
The exhaust extraction mechanism of vacuum indoor exhaust air to air vent, is provided with for deriving the vacuum at the gas outlet of the vacuum chamber
The airway of indoor exhaust air to the air vent, the exhaust extraction mechanism includes the first steam pump group part and water ring pump group
Part, the first steam pump group part includes at least two first steam pumps being sequentially communicated, and each first steam pump is gone here and there successively
It is coupled on the airway, the water ring pump group part includes the water ring pump being series on the airway, and the water ring pump position
Between the air vent and the first steam pump group part, it is characterised in that：Also include pressure regulating device, the pressure regulating device bag
Include the air inlet pipe that one end is in communication with the outside and the pressure regulator valve being arranged in the air inlet pipe, the other end of the air inlet pipe and institute
Airway connection is stated, and the junction between the airway and the air inlet pipe is located at second described the along waste gas flow direction
On the airway between one steam pump and the vacuum chamber, the pressure regulating device also includes being arranged on the airway
Pressure transducer, the pressure transducer is located between second first steam pump and the vacuum chamber of waste gas flow direction
The airway on, and the pressure transducer is electrically connected with the pressure regulator valve, and the pressure regulating device also includes being arranged at
Stop valve in the air inlet pipe, the stop valve be located at the end that is in communication with the outside with the air inlet pipe of the pressure regulator valve it
Between.
2. as claimed in claim 1 can automatic Regulation water ring pump-steam jet pump pipe-line system, it is characterised in that：Institute
State the airway that pressure transducer is located between first first steam pump and the vacuum chamber of waste gas flow direction
On.
3. as claimed in claim 1 can automatic Regulation water ring pump-steam jet pump pipe-line system, it is characterised in that：Institute
State the junction between airway and the air inlet pipe and be located at second first steam pump and first flowed to along waste gas
On the airway between first steam pump.
4. as described in any one of claim 1-3 can automatic Regulation water ring pump-steam jet pump pipe-line system, its feature
It is：Main control valve, the pressure regulation are provided with the airway between the first steam pump group part and the vacuum chamber
Mechanism is respectively positioned on side of the main control valve away from the vacuum chamber with the junction of the airway.
5. as described in any one of claim 1-3 can automatic Regulation water ring pump-steam jet pump pipe-line system, its feature
It is：The exhaust extraction mechanism also include at least one condensing tower and with the one-to-one spray assemblies of the condensing tower,
Each condensing tower is sequentially turned on to the air vent, is sequentially entered by the first steam pump group part expellant gas each described
In condensing tower, the water ring pump is with condensing tower is connected wherein described in one.
6. as claimed in claim 5 can automatic Regulation water ring pump-steam jet pump pipe-line system, it is characterised in that：In
The second steam pump group part is also in series with described in adjacent two between condensing tower, the second steam described in gas Jing in the previous condensing tower
Pump group part is entered in the latter condensing tower, the water ring pump and the second steam pump modules in parallel described in one of which.
7. as claimed in claim 6 can automatic Regulation water ring pump-steam jet pump pipe-line system, it is characterised in that：Institute
State the second steam pump group part and include at least one second steam pumps, each described the second of each second steam pump group part
Steam pump is connected with condensing tower described in adjacent two.
8. as claimed in claim 7 can automatic Regulation water ring pump-steam jet pump pipe-line system, it is characterised in that：Institute
Exhaust extraction mechanism is stated including three first steam pumps being sequentially connected in series and two second steam being sequentially connected in series
Pump, the water ring pump is arranged in parallel with latter described second steam pump flowed to along waste gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510264197.4A CN104878163B (en) | 2015-05-22 | 2015-05-22 | Water ring pump-steam jet pump pipeline system with automatic pressure regulating function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510264197.4A CN104878163B (en) | 2015-05-22 | 2015-05-22 | Water ring pump-steam jet pump pipeline system with automatic pressure regulating function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104878163A CN104878163A (en) | 2015-09-02 |
| CN104878163B true CN104878163B (en) | 2017-05-17 |
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ID=53945835
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510264197.4A Active CN104878163B (en) | 2015-05-22 | 2015-05-22 | Water ring pump-steam jet pump pipeline system with automatic pressure regulating function |
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| CN (1) | CN104878163B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203685714U (en) * | 2014-01-06 | 2014-07-02 | 中国重型机械研究院股份公司 | On-line automatic dust removal device of water vapor jet vacuum pump |
| CN103940256B (en) * | 2014-04-11 | 2016-04-20 | 张曙光 | With pressure controlled plant condenser vapor injection vacuum pumping system |
| CN204097509U (en) * | 2014-07-31 | 2015-01-14 | 中国重型机械研究院股份公司 | A kind of hybrid vacuum pump structure |
| CN104120214B (en) * | 2014-07-31 | 2016-04-27 | 中国重型机械研究院股份公司 | A kind of hybrid vacuum pump system |
| CN204185513U (en) * | 2014-10-11 | 2015-03-04 | 中冶南方工程技术有限公司 | RH refining furnace vacuum-pumping system |
| CN204737982U (en) * | 2015-05-22 | 2015-11-04 | 中冶南方工程技术有限公司 | But water ring pump - steam jet pump's of automatic voltage regulation pipe -line system |
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2015
- 2015-05-22 CN CN201510264197.4A patent/CN104878163B/en active Active
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| CN104878163A (en) | 2015-09-02 |
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