CN1982825A - Protecting mixed gas supplier for magnesium-alloy smelting furnace - Google Patents
Protecting mixed gas supplier for magnesium-alloy smelting furnace Download PDFInfo
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- CN1982825A CN1982825A CN 200510022364 CN200510022364A CN1982825A CN 1982825 A CN1982825 A CN 1982825A CN 200510022364 CN200510022364 CN 200510022364 CN 200510022364 A CN200510022364 A CN 200510022364A CN 1982825 A CN1982825 A CN 1982825A
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Abstract
The invention comprises a gas-mixing unit, a gas-collecting unit and at least one gas supply unit for supplying gas into the smelter. The gas-mixing unit includes a SF6 gas pipeline, a nitrogen gas pipeline and a mixed gas pipeline. The SF6 gas pipeline and the nitrogen gas pipeline are connected with the gas inlet of the mixed gas pipeline. The gas outlet of the mixed gas pipeline is connected with the gas-collecting unit and the gas-collecting unit is connected with each gas supply unit through the mixed gas pipeline.
Description
[technical field]
The present invention relates to a kind of protective gas mixed gas supply equipment that is used for magnesium-alloy smelting furnace.
[background technology]
Because the special chemical property of magnesium, the molten magnesium on magnesium and magnesium alloy surface in fusing, casting process is oxidizing fire very easily, therefore needs the special gas safeguard measure.
In early days, magnesium alloy smelting mainly adopts the salt covering flux to protect, though the method is protected respond well, but produce a large amount of slags, flue dust and pernicious gas, cause equipment corrosion and environmental pollution, even more serious is that covering flux impurity enters magnesium liquid, cause magnesium-alloy material mechanical properties decrease and corrosion resistance to worsen, thereby restricted the development of magnesium-alloy material; Since the seventies in last century, no flux magnesium alloy smelting technology is developed rapidly abroad, wherein, is used for magnesium alloy smelting with SF6 mist replacement salt coverture as protective gas and is used widely.Its protection mechanism is as follows: SF6 reacts on the magnesium alloy molten surface together with air one; formed MgF2 has filled up the space of the MgO film of Mg and oxygen reaction formation; form one deck metallic luster, fine and close, continuous diaphragm are arranged; come starvation with this; stop further oxidation of magnesium liquid and burning, thereby reach fire-retardant purpose.But this diaphragm can only be kept several minutes, so mist needs constantly to supply with.Facts have proved that in the magnesium-alloy smelting furnace of sealing, the SF6 gas that only needs to supply with extremely low concentration (0.01～0.4%) just can play a very good protection.At present; usually 0.1～0.4% SF6 gas is sneaked in the compressed air of nitrogen or drying; utilize the protective gas of the mist of SF6+ nitrogen (or air) as magnesium-alloy smelting furnace, it is generally acknowledged, the per minute volume flow of mist should be 5～8% of smelting furnace space.Because SF6 has certain corrosiveness to smelting furnace, the corrosion of excessive SF6 concentration meeting Accelerate Crucible, rare excessively concentration can not have effective protective effect, and therefore, the magnesium alloy smelting process has strict requirement to the matched proportion density and the flow of hybrid protection gas.Simultaneously, the accurate mixing of gas of realization 0.1～0.4% mixing ratio is again very difficult.
Existing application is divided into two kinds of forms in the protective gas mixed gas supply device of magnesium-alloy smelting furnace protection: 1) a kind of balance regulator gas mixer that uses as the supporting gas mixing apparatus of FRECH company die casting machine, its hybrid regulator is a patented product, cost an arm and a leg, and complex structure, less stable can not be monitored in real time; 2) another kind of frame mode is to utilize two flowmeters to measure and control the flow of SF6 and nitrogen respectively, its precision depends on the precision of the stable and flowmeter of pressure, the patent No. is ZL03239990.1, name is called " a kind of on-line mixing air feed equipment that is used for the magnesium alloy smelting protection ", date of declaration is that the Chinese patent on March 17th, 2004 adopts this kind technology, adopt mass flow controller and computer monitoring measure for improving control accuracy, though can improve control accuracy in theory, but, the corrosivity of SF6 can reduce the flow sensor service life of the precision of mass flow controller greatly, can not find a kind of mass flow controller commodity of the SF6 of being applicable to gas on the practical work, described in addition mass flow controller is very expensive, maintenance, the verification difficulty, thereby there is no practicality; In addition, owing to adopt automatically controlled measure, when meeting the burst power outage, equipment can't operate as normal, has potential safety hazard.
[summary of the invention]
The object of the present invention is to provide a kind of have a higher-security be used for the fire-retardant protective gas mixed gas supply equipment of magnesium-alloy smelting furnace.
The object of the present invention is achieved like this: a kind of protective gas mixed gas supply equipment that is used for magnesium-alloy smelting furnace comprises gas mixer; gas collecting apparatus and at least one are used for the gas input device to the smelting furnace air feed; this gas mixer comprises the SF6 gas intake line that is used for for the input of SF6 gas; the gaseous mixture pipeline that is used for the nitrogen intake line of importing for nitrogen and is used for supplying SF6 gas and nitrogen to mix; SF6 gas intake line all is connected with the air inlet of gaseous mixture pipeline with the nitrogen intake line; the gas outlet of gaseous mixture pipeline is connected with gas collecting apparatus, and gas collecting apparatus all is connected by the mixture output tube road with each gas input device.
Be equipped with flow control element and pressure control valve on described SF6 gas intake line and the nitrogen intake line.
Described flow control element is a flowmeter, and pressure control valve is a pressure-reducing valve.
Pressure-reducing valve on the described SF6 of being located at gas intake line and the nitrogen intake line is connected with the control pressure-reducing valve by control piper.
Also be equipped with filter on described SF6 gas intake line and the nitrogen intake line.
Described gaseous mixture pipeline is provided with magnetic valve, and this magnetic valve is connected with the pressure controller of its break-make of control.
Described mixture output tube road is provided with flow control element.
Described mixture output tube also is provided with pressure control valve and restricting element on the road.
The valve body that is used to control the air feed break-make is installed on the described gas collecting apparatus.Described gas input device and mixture output tube road all have two and corresponding one by one at least.
Compared with prior art, the present invention has following advantage: because the setting of gas collecting apparatus and gas input device, a gas collecting apparatus can be supplied gas to one to several smelting furnace by the gas input equipment simultaneously continuously, thereby improved the security of equipment operation greatly, satisfy the needs of large-scale die casting workshop or smelting equipment, and because the gas input equipment adopts form in parallel, so the damage of gas input equipment or smelting furnace can not have influence on the operate as normal of other smelting furnaces, has further improved security yet.
[description of drawings]
Fig. 1 is a structured flowchart of the present invention.
The schematic diagram of Fig. 2 gas mixing apparatus of the present invention and gas collecting apparatus.
Fig. 3 is the schematic diagram of gas input device of the present invention.
Fig. 4 is the structured flowchart of second specific embodiment of the present invention.
[specific embodiment]
See also Fig. 1 to Fig. 4; a kind of fire-retardant protective gas mixed gas supply equipment of magnesium-alloy smelting furnace that is used for of the present invention comprises the gas mixer 3 that connects successively; gas collecting apparatus 4 and at least one are used for the gas input device 5 to smelting furnace 6 air feed; this gas mixer comprises the SF6 gas intake line that is used for for the input of SF6 gas; the gaseous mixture pipeline that is used for the nitrogen intake line of importing for nitrogen and is used for supplying SF6 gas and nitrogen to mix; SF6 gas intake line all is connected with the air inlet of gaseous mixture pipeline with the nitrogen intake line; the gas outlet of gaseous mixture pipeline is connected with gas collecting apparatus, and gas collecting apparatus all is connected by the mixture output tube road with each gas input device.SF6 gas and nitrogen are respectively from source of the gas input SF6 gas input channel and nitrogen input channel, mix through importing the mixed air pipeline by a certain percentage after filtration, decompression and the metering, gas after mixed is input to gas collecting apparatus further to be mixed and stores, when smelting furnace needs to use gas, gas collecting apparatus is input to gas input device by the mixed air output channel, and this gas input device further filters, reduces pressure this gaseous mixture and measure the back and outputs to corresponding smelting furnace by pipeline.
This gas mixer comprises nitrogen intake line 45, SF6 gas intake line 44 and gaseous mixture pipeline 19.These nitrogen intake line 45 upper edge gas flow direction are provided with filter 8, pressure switch 9, pressure-reducing valve 12, visual flowmeter 15 and check valve 16 successively, and on this pipeline 45 between filter 8 and the pressure-reducing valve 12, be respectively equipped with visual Pressure gauge 10 and visual Pressure gauge 14 between visual flowmeter 15 and the pressure-reducing valve 12.These SF6 gas intake line 44 upper edge gas flow direction are provided with filter 34, pressure switch 33, pressure-reducing valve 31, visual flowmeter 29 and check valve 28 successively, and on this pipeline 44 between filter 34 and the pressure-reducing valve 31, be respectively equipped with visual Pressure gauge 32 and visual Pressure gauge 30 between visual flowmeter 29 and the pressure-reducing valve 31.This pressure-reducing valve 12 all is connected with same control pressure-reducing valve 11 by control piper 13 with pressure-reducing valve 31, thereby controls the outlet pressure of pressure-reducing valve 12,31 simultaneously by this control pressure-reducing valve 11.This nitrogen intake line 45 and SF6 gas intake line 44 all are connected with the air inlet of gaseous mixture pipeline 19, mix thereby nitrogen and SF6 gas are pooled in this mixed air pipeline 19.The direction of these mixed air pipeline 19 upper edge gas flow is provided with magnetic valve 17, pressure switch 26 and check valve 25 successively, and the pressure controller 27 that this magnetic valve 17 and one is used to control its break-make is connected, in addition, between magnetic valve 17 and check valve 25, also be provided with visual Pressure gauge 18 on this pipeline 19.
This gas collecting apparatus 2 is connected with the gas outlet of gaseous mixture pipeline 19, it comprises gas cylinder 24, safety valve 20, visual Pressure gauge 21, stop valve 22 and check valve 25, this gas cylinder 24 is used for further mixing SF6 gas and nitrogen and stores mist, safety valve 20, visual Pressure gauge 21, stop valve 22 and check valve 25 are installed on this gas cylinder 24, to be used to guarantee security of operation.
This gas input equipment is connected by mixture output tube road 23 with gas collecting apparatus, be provided with filtering pressure reducing valve 37, threeway piece 42, choke valve 41, visual flowmeter 40 and check valve 39 on the direction of these mixed air output pipe 23 upper edge gas flow successively, and between filtering pressure reducing valve 37 and choke valve 41, also be provided with visual Pressure gauge 43 on this pipeline 23.
Operation principle of the present invention is as follows: SF6 gas intake line 44 and the nitrogen intake line 45 of sending into gas mixer 3 from the nitrogen of the SF6 gas of SF6 source of the gas 1 and nitrogen source of the gas 2 after decompression respectively, not enough as bleed pressure, then the connected alarm lamp of pressure switch 9,33 meeting drivings is luminous, carry out sound and light alarm, prompting is adjusted bleed pressure or is changed source of the gas.The pressure of adjusting control pressure-reducing valve 11 can be regulated the outlet pressure of the pressure-reducing valve 12,31 on described SF6 gas intake line 44 and the nitrogen intake line 45 easily simultaneously, makes pressure stability, the unanimity of two visual flowmeter 15,29 front ends.Visual Pressure gauge 10,14,30,32 can read and monitor the pressure condition of gas easily, and flowmeter 15,29 is respectively applied for the flow of nitrogen and SF6 gas on the control intake line 45,44, reaches the purpose of mixing in proportion.Pressure controller 27 is used to control the break-make of magnetic valve 17, thereby the pressure in the control gas cylinder 24, and with its pressure stability within the specific limits, guaranteed the stable of flowmeter outlet pressure, thereby make the flowmeter metering stable more, accurate, improved measuring accuracy.Visual Pressure gauge 18 is used to indicate mixed gas pressure, and pressure switch 26 is used for undervoltage warning, the prompt facility fault.The gas cylinder 24 that mixed gas injects gas collecting apparatus further mixes.The gaseous mixture that is stored in the gas cylinder 24 is connected with one or more gas input devices 5 respectively by mixture output tube road 23, the gaseous mixture that enters gas input device 5 is input to corresponding magnesium-alloy smelting furnace after through further filtration, decompression, throttling, metering again, stops magnesium alloy liquation oxidizing fire.
Among the present invention, gas input device can be two or more (as shown in Figure 4), and each gas input device is connected with gas collecting apparatus by the mixed air output channel respectively, is arranged in parallel and each gas input device is.Each gas input device all can be by the protective gas pipeline connection of pipeline 39 with corresponding smelting furnace 6, and perhaps a gas input device while is connected with a plurality of smelting furnaces.
The present invention has following advantage: 1) adopt the protective gas of the mist (wherein the content of SF6 is 0.1～0.4%) of SF6 and nitrogen as magnesium-alloy smelting furnace, facts have proved, it is one of effective method the most at present, it is nontoxic, can not etching apparatus, can not form flue dust, can not pollute magnesium liquid, help guaranteeing the mechanical property and the corrosion resistance of magnesium alloy product; 2) adopt pressure-reducing valve as pressure control valve, flowmeter is as flow control element, and is simple in structure, reliable, with low cost, and the preparative capacibility of gaseous mixture and mixed proportion can be controlled by regulating flow, and can intuitively read by visual Pressure gauge; 3) owing to be provided with gas collecting apparatus, can supply one to several smelting furnaces and use simultaneously, also can two or many in parallel uses, thus improved the security of equipment operation widely, satisfy the needs of large-scale die casting workshop or smelting equipment; 4) this air feed equipment adopts frame for movement, and such environmental effects such as do not had a power failure also can guarantee the supply of gaseous mixture when meeting the burst power outage, and security is good; 5) adopt the gas input equipment that splits, help concrete needs adjustments of gas flow according to smelting furnace, satisfy the needs of coping with contingencies, and this gas input device can be for being arranged in parallel several, so when a gas input device or smelting furnace break down, can not have influence on other the gas input equipment and the operate as normal of smelting furnace.
Claims (10)
1. protective gas mixed gas supply equipment that is used for magnesium-alloy smelting furnace; it is characterized in that: comprise gas mixer; gas collecting apparatus and at least one are used for the gas input device to the smelting furnace air feed; this gas mixer comprises the SF6 gas intake line that is used for for the input of SF6 gas; the gaseous mixture pipeline that is used for the nitrogen intake line of importing for nitrogen and is used for supplying SF6 gas and nitrogen to mix; SF6 gas intake line all is connected with the air inlet of gaseous mixture pipeline with the nitrogen intake line; the gas outlet of gaseous mixture pipeline is connected with gas collecting apparatus, and gas collecting apparatus all is connected by the mixture output tube road with each gas input device.
2. a kind of protective gas mixed gas supply equipment that is used for magnesium-alloy smelting furnace as claimed in claim 1 is characterized in that: be equipped with flow control element and pressure control valve on described SF6 gas intake line and the nitrogen intake line.
3. a kind of protective gas mixed gas supply equipment that is used for magnesium-alloy smelting furnace as claimed in claim 2, it is characterized in that: described flow control element is a flowmeter, pressure control valve is a pressure-reducing valve.
4. a kind of protective gas mixed gas supply equipment that is used for magnesium-alloy smelting furnace as claimed in claim 3 is characterized in that: the pressure-reducing valve on the described SF6 of being located at gas intake line and the nitrogen intake line is connected with the control pressure-reducing valve by control piper.
5. a kind of protective gas mixed gas supply equipment that is used for magnesium-alloy smelting furnace as claimed in claim 2 is characterized in that: also be equipped with filter on described SF6 gas intake line and the nitrogen intake line.
6. a kind of protective gas mixed gas supply equipment that is used for magnesium-alloy smelting furnace as claimed in claim 1, it is characterized in that: described gaseous mixture pipeline is provided with magnetic valve, and this magnetic valve is connected with the pressure controller of its break-make of control.
7. a kind of protective gas mixed gas supply equipment that is used for magnesium-alloy smelting furnace as claimed in claim 1, it is characterized in that: described mixture output tube road is provided with flow control element.
8. a kind of protective gas mixed gas supply equipment that is used for magnesium-alloy smelting furnace as claimed in claim 7, it is characterized in that: described mixture output tube also is provided with pressure control valve and restricting element on the road.
9. a kind of protective gas mixed gas supply equipment that magnesium alloy melts the road that is used for as claimed in claim 1 is characterized in that: the valve body that is used to control the air feed break-make is installed on the described gas collecting apparatus.
10. as any described a kind of protective gas mixed gas supply equipment that is used for magnesium-alloy smelting furnace among the claim 1-9, it is characterized in that: described gas input device and mixture output tube road all have two and corresponding one by one at least.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510022364 CN1982825A (en) | 2005-12-17 | 2005-12-17 | Protecting mixed gas supplier for magnesium-alloy smelting furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510022364 CN1982825A (en) | 2005-12-17 | 2005-12-17 | Protecting mixed gas supplier for magnesium-alloy smelting furnace |
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| CN1982825A true CN1982825A (en) | 2007-06-20 |
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| CN 200510022364 Pending CN1982825A (en) | 2005-12-17 | 2005-12-17 | Protecting mixed gas supplier for magnesium-alloy smelting furnace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591452A (en) * | 2013-09-30 | 2014-02-19 | 国家电网公司 | Mixed gas charging device for high-voltage electrical equipment |
| CN106525425A (en) * | 2016-12-05 | 2017-03-22 | 江苏大学 | Bearing test device and method for static-pressure radial air bearing |
| CN106958739A (en) * | 2017-04-27 | 2017-07-18 | 无锡爱邦辐射技术有限公司 | Electron linear accelerator aerating device with automatic protection functions |
-
2005
- 2005-12-17 CN CN 200510022364 patent/CN1982825A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103591452A (en) * | 2013-09-30 | 2014-02-19 | 国家电网公司 | Mixed gas charging device for high-voltage electrical equipment |
| CN103591452B (en) * | 2013-09-30 | 2016-05-04 | 国家电网公司 | High voltage electric equipment mist aerating device |
| CN106525425A (en) * | 2016-12-05 | 2017-03-22 | 江苏大学 | Bearing test device and method for static-pressure radial air bearing |
| CN106958739A (en) * | 2017-04-27 | 2017-07-18 | 无锡爱邦辐射技术有限公司 | Electron linear accelerator aerating device with automatic protection functions |
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