CN207330984U - A kind of changeable mechanical pump air extractor of vacuum refining of liquid steel - Google Patents
A kind of changeable mechanical pump air extractor of vacuum refining of liquid steel Download PDFInfo
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- CN207330984U CN207330984U CN201720794556.1U CN201720794556U CN207330984U CN 207330984 U CN207330984 U CN 207330984U CN 201720794556 U CN201720794556 U CN 201720794556U CN 207330984 U CN207330984 U CN 207330984U
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Abstract
A kind of changeable mechanical pump air extractor of vacuum refining of liquid steel, belongs to steel-making furnace outer refining technology field.Including water cooling exhaust tube (1), gas cooler (2), exhaust tube (3), vacuum be switched fast box (4), high-temperature dust filter (5), pump before valve (6), Roots's pump group (7), pump after valve (8), switching valve (9), screw rod pump group (10), water ring pump group (11), emptying pipeline (12).The achievable 4 kinds of different combinations of box (4), switching valve (9) are switched fast by vacuum, to adapt to operating mode different in vacuum process.Advantage is there is mechanical pump group pumping efficiency height, equipment life is long, operating cost is low.
Description
Technical field
The utility model belongs to steel-making furnace outer refining technology field, the changeable machine of more particularly to a kind of vacuum refining of liquid steel
Tool pumping device of air, suitable for making steel vacuum refining of liquid steel technique, including RH, VD, VCD, VOD, VC application of vacuum etc..
Background technology
The application of steel-making furnace outer refining technology is very extensive at present, and especially the vacuum refining of molten steel is to improving product cleanliness factor
Increasingly obtain the attention of steel mill.Vacuum refining of liquid steel technique mainly has the multi-forms such as RH, VD, VCD, VOD, VC, its is common
It is characterized in being required for a set of pumped vacuum systems, the molten steel environment of sealing is in subatmospheric (negative pressure) shape using the system
State.Under different subnormal ambients, various forms of vacuum processing techniques realize different metallurgical targets, such as VD (Vacuum
Degassing) vacuum outgas be generally 67Pa, VCD (Vacuum Carbon Deoxidation) vacuum carbon deoxidization 10KPa,
VOD (Vacuum Oxidation Decarbon) vacuum oxygen decarbonization 20KPa, VC (Vacuum Casting) vacuum casting 133Pa
Deng.
Since motor speed reduction or shutdown can be well adapted for the work of application of vacuum interruption by oil-sealed rotary pump
System, can reduce production cost, have the characteristics that energy-saving and emission-reduction, therefore certain answer has been obtained on application of vacuum facility
With.But a conventionally employed at present lobe pump+there are the following problem for secondary lobe pump+three-level screw pump：1, due to
It is all very high that exhaust gas temperature and dustiness are extracted in vacuum process, there are lobe pump and screw pump fever and dust abrasion pump
Body behind efficiency reduces；2, even if as described in patent CN204401047U：Using a lobe pump+secondary lobe pump+three-level water ring
Pumping system, there is also pre- length of finding time, power consumption are high.It is more energy efficient because screw pump is more efficient than water ring pump；3, in molten steel vacuum fine
During refining, generally require by several different processing stages, such as when RH handles high-level steel grade needs to carry out vacuum outgas, true
Empty decarburizing phase.Negative pressure and flue-gas temperature and the operating mode of dust have larger difference under the different stages.Using above-mentioned level-one sieve
Thatch pump+two level lobe pump+three-level screw pump or level-one lobe pump+two level lobe pump+three-level water ring pump all cannot all adapt to this
A little operating modes.
The content of the invention
The purpose of this utility model is to provide a kind of vacuum refining of liquid steel with changeable mechanical pump air extractor, passes through one
Level lobe pump, two level lobe pump, three-level screw pump and water ring pump switching combining, various combination is automatically switched to according to different operating modes
Pattern, to adapt to technique needs, achievees the purpose that to improve the mechanical efficiency of pump, prolongs the service life, reduces operating cost.
The purpose of this utility model is achieved through the following technical solutions：
The device mainly includes water cooling exhaust tube 1, gas cooler 2, exhaust tube 3, vacuum and is switched fast box 4, high temperature powder
Dirt filter 5, pump before valve 6, Roots's pump group 7, pump after valve 8, switching valve 9, screw rod pump group 10, water ring pump group 11, emptying pipeline 12.
The order of connection of the device from left to right is：By exhaust pipe and 1 flanged joint of water cooling exhaust tube, water cooling exhaust tube
1 uses flanged joint with gas cooler 2, and the outlet of gas cooler 2 connects with exhaust tube 3；The right side of exhaust tube 3 and vacuum
It is switched fast box 4 to connect, vacuum, which is switched fast box 4, can realize that the break-make of both direction is switched fast, and high-temperature dust is led in one end
Filter 5.Valve 6 before the other end merges the pump for leading to level-one Roots's pump group with the outlet of high-temperature dust filter 5.Level-one lobe pump
Group joins with two level lobe pump string formation, same level Roots's parallel connection of pumps.It can be divided into two-way after two level Roots's pump group, one is set per road
Switching valve 9, wherein connecting all the way with screw rod pump group 10.Another way connects with water ring pump group 11, after two-way pump valve outlet collect with
Emptying pipeline 12 connects.
Box 4 is switched fast by vacuum, 9 present apparatus of switching valve can realize following 4 kinds of combinations：
Combination 1：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-high-temperature dust filter-mono-
Level Roots pump group-two level Roots pump group-switching valve-three-level screw rod pump group-discharge duct, is conventional combination mode, in water
It is alternative during ring failure of pump；
Combination 2：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-high-temperature dust filter-mono-
Level Roots pump group-two level Roots pump group-switching valve-three-level water ring pump group-discharge duct, suitable for VOD vacuum oxygen decarbonizations
Operating mode；
Combination 3：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-level-one Roots pump group-two level
Roots's pump group-switching valve-three-level screw rod pump group-discharge duct, suitable for forvacuum and VD vacuum outgas operating modes；
Combination 4：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-level-one Roots pump group-two level
Roots's pump group-switching valve-three-level water ring pump group-discharge duct, suitable for VCD vacuum carbon deoxidization operating modes.
The major advantage of the utility model is：
1st, for pumped gas high-temperature high dust operating mode, there is provided water cooling pump-line, gas cooler and high-temperature dust point
From device.It can solve the problems, such as that lobe pump and screw pump fever and dust abrasion pump housing behind efficiency reduce；
2nd, various combination mode is switched to, adapts to different works by different processing stages in vacuum refining of liquid steel
Condition, reaches reduction operating cost, extends service life of equipment, improves the purpose of pumping efficiency.Such as in the VD vacuum outgas stages,
There are the features such as vacuum is high, fuel gas and dust concentration is low, pumpdown time is long in technique, combination 3 is selected to meet Gao Zhen
Reciprocal of duty cycle requirement, there is the characteristics of can playing screw pump low energy consumption；For the VOD vacuum oxygen decarbonization stages, in technique there are carbon oxygen and
Metal vigorous oxidation reaction, working vacuum degree is low, dust is big, temperature is high, should select combination 2 at this time, avoid using pair
The screw rod pump group of exhaust gas temperature and dust sensitive, so as to ensure the service life of equipment and the stability of extract system.
3rd, since screw rod pump group equipment machining accuracy is higher, the failure rate of equipment is also higher, can be achieved in this combination
Screw rod pump group is spare each other with water ring pump group, ensure that the reliability of extract system, can effectively prevent air-extractor failure from drawing
The production interruption risen.
Brief description of the drawings
Fig. 1 is combined machine pumping device of air schematic diagram.Wherein, water cooling exhaust tube 1, gas cooler 2, exhaust tube 3,
Vacuum be switched fast box 4, high-temperature dust filter 5, pump before valve 6, Roots's pump group 7, pump after valve 8, switching valve 9, screw rod pump group
10th, water ring pump group 11, emptying pipeline 12.
Embodiment
Below in conjunction with the accompanying drawings, the utility model is described further.
As shown in Figure 1, device composition includes：Water cooling exhaust tube 1, gas cooler 2, exhaust tube 3, vacuum are switched fast
Box 4, high-temperature dust filter 5, pump before valve 6, Roots's pump group 7, pump after valve 8, switching valve 9, screw rod pump group 10, water ring pump group 11,
Empty pipeline 12；
By exhaust pipe and 1 flanged joint of water cooling exhaust tube, water cooling exhaust tube 1 uses flanged joint with gas cooler 2,
The outlet of gas cooler 2 connects with exhaust tube 3；The right side of exhaust tube 3 is switched fast box 4 with vacuum and is connected, and vacuum is switched fast
Box 4 can realize that the break-make of both direction is switched fast, and high-temperature dust filter 5 is led in one end.The other end is filtered with high-temperature dust
The outlet of device 5 merges valve 6 before the pump for leading to level-one Roots's pump group.Level-one Roots pump group joins with two level lobe pump string formation, same level
Roots's parallel connection of pumps.Can be divided into two-way after two level Roots's pump group, per road set a switching valve 9, wherein all the way with screw rod pump group
10 connect.Another way connects with water ring pump group 11, and valve outlet collects after two-way pump is connected with emptying pipeline 12.
Box 4 is switched fast by vacuum, 9 present apparatus of switching valve can realize following 4 kinds of combinations：
Combination 1：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-high-temperature dust filter-mono-
Level Roots pump group-two level Roots pump group-switching valve-three-level screw rod pump group-discharge duct, is conventional combination mode, in water
It is alternative during ring failure of pump；
Combination 2：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-high-temperature dust filter-mono-
Level Roots pump group-two level Roots pump group-switching valve-three-level water ring pump group-discharge duct, suitable for VOD vacuum oxygen decarbonizations
Operating mode；
Combination 3：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-level-one Roots pump group-two level
Roots's pump group-switching valve-three-level screw rod pump group-discharge duct, suitable for forvacuum and VD vacuum outgas operating modes；
Combination 4：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-level-one Roots pump group-two level
Roots's pump group-switching valve-three-level water ring pump group-discharge duct, suitable for VCD vacuum carbon deoxidization operating modes.
Claims (3)
- A kind of 1. changeable mechanical pump air extractor of vacuum refining of liquid steel, it is characterised in that including：Water cooling exhaust tube (1), gas Body cooler (2), exhaust tube (3), vacuum are switched fast valve (6), Roots's pump group before box (4), high-temperature dust filter (5), pump (7), valve (8), switching valve (9), screw rod pump group (10), water ring pump group (11), emptying pipeline (12) after pumping；By exhaust pipe and water Cold exhaust tube (1) flanged joint, water cooling exhaust tube (1) use flanged joint with gas cooler (2), gas cooler (2) Outlet connects with exhaust tube (3)；Box (4) is switched fast on the right side of exhaust tube (3) with vacuum to be connected, vacuum is switched fast box (4) one High-temperature dust filter (5) is led at end；The other end merges with the outlet of high-temperature dust filter (5) and leads to level-one Roots's pump group Valve (6) before pump；Level-one Roots pump group joins with two level lobe pump string formation, same level Roots's parallel connection of pumps；It is divided into after two level Roots's pump group Two-way, a switching valve (9) is set per road, wherein connecting all the way with screw rod pump group (10)；Another way and water ring pump group (11) phase Connect, valve outlet collects after two-way pump is connected with emptying pipeline (12).
- 2. device according to claim 1, it is characterised in that：There are four kinds of combinations：Pass through switching combining mode 1：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-high-temperature dust filtering Device-level-one Roots pump group-two level Roots pump group-switching valve-three-level screw rod pump group-discharge duct, is conventional combination side Formula；Combination 2：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-high-temperature dust filter-level-one sieve Thatch pump group-two level Roots pump group-switching valve-three-level water ring pump group-discharge duct；Combination 3：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-level-one Roots pump group-two level Roots Pump group-switching valve-three-level screw rod pump group-discharge duct；Combination 4：Water cooling exhaust tube-gas cooler-vacuum is switched fast box-level-one Roots pump group-two level Roots Pump group-switching valve-three-level water ring pump group-discharge duct, suitable for VCD vacuum carbon deoxidization operating modes.
- 3. the apparatus of claim 2, it is characterised in that：Three-level pump group is in parallel using screw rod pump group and water ring pump group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720794556.1U CN207330984U (en) | 2017-07-03 | 2017-07-03 | A kind of changeable mechanical pump air extractor of vacuum refining of liquid steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720794556.1U CN207330984U (en) | 2017-07-03 | 2017-07-03 | A kind of changeable mechanical pump air extractor of vacuum refining of liquid steel |
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| CN207330984U true CN207330984U (en) | 2018-05-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326151A (en) * | 2017-07-03 | 2017-11-07 | 北京首钢国际工程技术有限公司 | A kind of vacuum refining of liquid steel is with changeable mechanical pump air extractor |
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2017
- 2017-07-03 CN CN201720794556.1U patent/CN207330984U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107326151A (en) * | 2017-07-03 | 2017-11-07 | 北京首钢国际工程技术有限公司 | A kind of vacuum refining of liquid steel is with changeable mechanical pump air extractor |
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