CN101182593A - Gas stove outer circulation cooling method of double chamber atmosphere pressure hardening furnace and cooling system thereof - Google Patents
Gas stove outer circulation cooling method of double chamber atmosphere pressure hardening furnace and cooling system thereof Download PDFInfo
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- CN101182593A CN101182593A CNA2007101587658A CN200710158765A CN101182593A CN 101182593 A CN101182593 A CN 101182593A CN A2007101587658 A CNA2007101587658 A CN A2007101587658A CN 200710158765 A CN200710158765 A CN 200710158765A CN 101182593 A CN101182593 A CN 101182593A
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Abstract
A gas furnace external circulation cooling method and a cooling system of a double-chamber constant-pressure quenching furnace belongs to the metal quenching field; aiming at the defects of wasting nitrogen with the prior art, the invention provides a method by which the high-temperature nitrogen is discharged from the top of the quenching furnace to be introduced into a heat exchanger out of the furnace for cooling; and then the nitrogen is mixed with the liquid nitrogen from a liquid nitrogen storage tank to participate in the quenching process and the circulation of the gas out of the furnace; the system which implements the method is that the nitrogen outlet at the top of a cooling chamber is connected with the heat exchanger and the outlet of the heat exchanger is connected with the outlet pipe of the liquid nitrogen storage tank in parallel; the main pipe after the parallel connection is connected with the air intake of a convergent divergent channel which is arranged on the cooling chamber; the outlet of the convergent divergent channel is connected with a nozzle to form a gas circulation cooling system; the inlet of a heat exchanging pipe in the heat exchanger is connected with a water pump or a fan and the inlet of the water pump is connected with a water tank; the inlet of the fan is arranged in the atmosphere to form circulation cooling system; the liquid nitrogen storage tank is connected with the parallel main pipe to form a medium supply system. The invention is characterized by saving nitrogen and high-quality quenching.
Description
Technical field
The invention belongs to metal quenching field, especially in regard to a kind of gas stove outer circulation method of cooling of double chamber atmosphere pressure hardening furnace.
Background technology
The extensive at present gas quenching Thermal Equipment that adopts, except the high pressure vacuum quenching furnance, the most common with the double chamber atmosphere pressure gas quenching furnace, this quenching furnance comprises an intensification heated oven chamber and a gas cooling furnace chamber, is provided with one movable fire door between two furnace chambers.Heated oven chamber generally adopts carbon-point resistive heating mode, charges into protective gas in heat-processed in burner hearth, to avoid the workpiece surface oxidation.After workpiece is finished heating and insulation, open two fire doors between the furnace chamber, make workpiece enter the cooling furnace chamber and cool off fast, heat-eliminating medium generally adopts liquid nitrogen.Liquid nitrogen is stored in the high-pressure gas cylinder of steel, draw by pipeline, in flow process, liquid nitrogen constantly reduces pressure, heat up, the part liquid nitrogen vaporization, volume expands rapidly, pressure can constantly be converted into fluidic kinetic energy, makes its flow velocity continue to increase, last form with liquid vapour mixture, with very big flow velocity by having definite shape and certain inclination angle, the nozzle that is installed in the cooling room bottom sprays in the cooling room, this moment, liquid nitrogen was gasified totally, and it finishes heat exchange with the mode and the workpiece of forced-convection heat transfer, and the temperature of workpiece is reduced rapidly, thereby finish the quenching of workpiece, and himself temperature raises, and the effect of the convection fan of a part of subsequently nitrogen by being installed in furnace roof forms furnace atmosphere circulation, participate in heat exchange once more, other most of nitrogen discharges out of the furnace by the exhaust-duct of furnace roof.The subject matter that this quenching furnance exists is that the liquid nitrogen consumption is very big, waste very seriously, has increased production cost greatly, and inhomogeneous owing to work-piece cools, and workpiece easily deforms, and its qualification rate is relatively low.
Summary of the invention
The objective of the invention is to be the double chamber atmosphere pressure gas quenching furnace, provide that a kind of nitrogen consumption is few, work-piece cools speed is big, and the outer gas circulation method of stove and the cooling system of oxidation and distortion can not take place everywhere after cooling off evenly, quenching in workpiece.
The technical solution adopted for the present invention to solve the technical problems is: under the prerequisite that satisfies maximum workpiece usage space, dwindle furnace cavity as much as possible, distance between the workpiece outside and the body of heater is advisable with 100～150mm, make cooling gas can both participate in workpiece and carry out heat exchange, the high temperature nitrogen gas of finishing after the heat exchange adopts the stove outer circulation type of cooling to cool off.According to the concrete characteristics of workpiece and the concrete size of quenching furnace chamber, on the furnace wall of both sides and furnace bottom, the multiple spot tuyere is set, the layout of nozzle can adopt way flow ejector half or alternating flow ejector half, also entad can adopt (nozzle) flow model, be determined on a case-by-case basis, at furnace roof the multiple spot venting port is set, the convergent-divergent channel of one fixed structure and size is installed in the front of each nozzle, nitrogen can be sprayed with supersonic speed or transonic flow velocity, workpiece in the stove is carried out Cooling Quenching, high temperature nitrogen behind the absorption heat is discharged by the venting port of furnace roof, then enter interchanger, by water-cooled or air cooling interchanger with the heat-eliminating medium in the heat transferred interchanger in the nitrogen, thereby the temperature of nitrogen self is reduced, pressurize by centrifugal high pressure fan more subsequently, send into the liquid nitrogen output channel, participate in the circulation of nitrogen, this way both can make ducted nitrogen temperature further reduce, pressure after liquid nitrogen vaporization is expanded can be converted into the kinetic energy of gas, thereby further improve flow velocity, subsequently nitrogen by convergent-divergent channel and nozzle after, spray into burner hearth with supersonic speed or transonic flow velocity, participate in the heat exchange of workpiece once more, thereby finish a loop cycle, the circulation of such process is carried out continuously, up to work-piece cools till the specified temperature.
The invention has the beneficial effects as follows:
(1) high temperature nitrogen of discharging from burner hearth can reuse, thereby the liquid nitrogen consumption is reduced significantly.
(2) nitrogen has supersonic speed or transonic flow velocity, thereby has strengthened the convective heat exchange between nitrogen and the workpiece, thereby can better meet the requirement of quenching technology when nozzle sprays.
(3) nitrogen is when nozzle sprays, and liquid nitrogen has been gasified totally and has been raised to certain temperature, thereby can avoid the local overcooling of workpiece, improves the quenching quality of workpiece.
(4) concerning burner hearth, the nitrogen flow that sprays into from nozzle is greater than from recycling the flow that gas port is discharged, the nitrogen that has more overflow as fire door gas on the one hand and stove outer circulation process in the replenishing of gas loss, can guarantee the micro-pressure operation of burner hearth, the recycle gas in the stove is upgraded timely.
Description of drawings
Fig. 1 is a cooling system structure synoptic diagram of the present invention;
Among the figure: 1 nozzle, 2 convergent-divergent channels, 3 workpiece, 4 venting ports, 5 bodies of heater, 6 interchanger, 7 cooling basins, 8 recirculated water versions, 9 centrifugal high pressure machines, 10 liquid nitrogen transport pipes, 11 nitrogen storage tank.
Embodiment
The gas stove outer circulation method of cooling of double chamber atmosphere pressure hardening furnace of the present invention, employing nitrogen quenches, high temperature nitrogen from the discharge of quenching furnace roof, be incorporated in the stove external heat exchanger 6, lower the temperature, nitrogen after the cooling mixes again with from the liquid nitrogen in the nitrogen storage tank 11, participates in after the mixing quenching and the outer gas circulation of stove again.Wherein:
The flow of ejection nitrogen is greater than the nitrogen flow of discharging from burner hearth, and pressure is greater than zero millimeter water column in the burner hearth.
The heat-eliminating medium of circulation is water or air in the heat exchanger 6.
As embodiment one:
Certain company mainly produces various speedy steel cutting-tools, cutter hub adopts the Q235B carbon structural steel, blade adopts the W18Cr4V rapid steel, two kinds of materials rely on soldering to combine, scolder adopts brass, the cutter that welding is good needs quenching heat treatment to improve the hardness and the mechanical property of W18Cr4V rapid steel blade, quenching apparatus adopts twin furnace atmosphere gas quenching furnance, the physical dimension of quenching furnance is 6500mm * 2800mm * 2500mm (length * wide * height), thickness ξ≤the 50mm of general workpiece 3, most of ξ≤20mm, workpiece 3 is placed on the carriage of manufacturing with the Q235B structure iron, and every stove batch is about 200kg, quenching temperature is 1260 ℃～1280 ℃, every stove consumes the about 700～800L of liquid nitrogen before improving, and annual liquid nitrogen expense surpasses 4,000,000 yuan, and product percent of pass has only about 92%.In order to reduce liquid nitrogen consumption, improve qualification rate, on the basis of original stove, adopt the cooling system described in the present invention, adopt the way flow ejector half to arrange at nozzle 1,4 exhaust body spouts respectively are set on the furnace wall of the both sides of stove, two row's spout spacing 300mm on short transverse, every row goes up 20 of uniform spouts along its length, and dust diameter is DN10mm before the spout, 6 exhaust body spouts are set in the bottom of stove, two row's spout spacing 400mm on short transverse, every row goes up 25 of uniform spouts along its length, and dust diameter is DN10mm before the spout, convergent-divergent channel 2 is installed before each nozzle 1, nitrogen outlet flow velocity 250～300m/s, at furnace roof intermediate arrangement 1 row's venting port 4, venting port 4 diameters are DN100mm, amount to 15, go up uniform along its length.The high temperature nitrogen of discharging from burner hearth adopts copper tube recuperative heat exchanger 6, the about 55m of heat interchanging area
2, water circulating pump 8 power 1.5kw, centrifugal high pressure fan 9 power 18kw.Liquid nitrogen consumption reduces by 60～70%, has realized the accurate control of process of cooling simultaneously, make owing to inhomogeneous cooling, and the scrap rate that produces greatly reduces, and qualification rate has reached more than 98%.
As embodiment two:
Rapid steel machinery knives production line is newly gone up by certain company, cutter hub adopts Q235B carbon structural steel or 16Mn low-alloy structural, cutter head adopts W18Cr4V or W9Mo3Cr4V rapid steel, two kinds of materials rely on soldering to combine, scolder adopts brass, the cutter that welding is good needs quenching heat treatment to improve the hardness and the mechanical property of rapid steel blade, its quenching apparatus adopts twin furnace atmosphere gas quenching furnance, the physical dimension of quenching furnance is 6000mm * 2500mm * 2000mm (length * wide * height), workpiece 3 is placed on the carriage of manufacturing with the Q235B structure iron, every stove batch is about 150kg, and quenching temperature is 1240 ℃～1280 ℃
In design, adopt the cooling system described in the present invention, the nitrogen outlet on the cooling room top in this system links to each other with heat exchanger, heat exchanger outlet is in parallel with nitrogen storage tank 11 outlet pipes, house steward after its parallel connection links to each other with convergent-divergent channel 2 blast inlets on the cooling room again, convergent-divergent channel 2 outlets link to each other with nozzle 1, form the gas circulation cooling system; Heat transfer tube inlet in the heat exchanger links to each other with water pump or blower fan, and outlet links to each other with the pond pump entrance with heat transfer tube, and fans entrance places atmosphere, forms circulating cooling system; Nitrogen storage tank 11 is connected to form the medium supply system with house steward in parallel.Wherein adopt the way flow ejector half to arrange nozzle 1,4 exhaust body spouts respectively are set on the furnace wall of the both sides of stove, two row's spout spacing 280mm on short transverse, every row goes up 18 of uniform spouts along its length, dust diameter is DN10mm before the spout, 6 exhaust body spouts are set in the bottom of stove, two row's spout spacing 380mm on short transverse, every row goes up 20 of uniform spouts along its length, and dust diameter is DN10mm before the spout, convergent-divergent channel 2 is installed before each nozzle 1, nitrogen outlet flow velocity 200～250m/s, at furnace roof intermediate arrangement 1 row's venting port 4, venting port 4 diameters are DN100mm, amount to 12, go up uniform along its length.The high temperature nitrogen of discharging from burner hearth adopts copper tube recuperative heat exchanger 6, the about 45m of heat interchanging area
2, water circulating pump 8 power 1.2kw, centrifugal high pressure fan 9 power 15kw, after the operation, every stove consumes the about 100～120L of liquid nitrogen, compares with other traditional twin furnace atmosphere gas quenching furnance of the same type, the liquid nitrogen consumption reduces by 70～75%, and product percent of pass has reached 98.5%.
Claims (5)
1. the gas stove outer circulation method of cooling of a double chamber atmosphere pressure hardening furnace, employing nitrogen quenches, it is characterized in that from the high temperature nitrogen of quenching furnace roof discharge, be incorporated in the stove external heat exchanger, lower the temperature, nitrogen after the cooling mixes again with from the liquid nitrogen in the nitrogen storage tank, participates in after the mixing quenching and the outer gas circulation of stove again.
2. the gas circulation method of cooling of a kind of double chamber atmosphere pressure hardening furnace according to claim 1 is characterized in that said nozzle entrance is equipped with convergent-divergent channel, and outlet is with supersonic speed or near velocity of sound ejection nitrogen.
3. the gas circulation method of cooling of a kind of double chamber atmosphere pressure hardening furnace according to claim 1 is characterized in that said ejection nitrogen, and its flow is greater than the nitrogen flow of discharging from burner hearth, and pressure is greater than zero millimeter water column in the burner hearth.
4. the gas circulation method of cooling of a kind of double chamber atmosphere pressure hardening furnace according to claim 1 is characterized in that said heat exchanger, and heat-eliminating medium of circulation is water or air in it.
5. cooling system of implementing claim 1, comprise double chamber atmosphere pressure hardening furnace, the nitrogen outlet that it is characterized in that the cooling room top links to each other with heat exchanger, heat exchanger outlet is in parallel with the nitrogen storage tank outlet pipe, house steward after its parallel connection links to each other with convergent-divergent channel blast inlet on the cooling room again, the convergent-divergent channel outlet links to each other with nozzle, forms the gas circulation cooling system; Heat transfer tube inlet in the heat exchanger links to each other with water pump or blower fan, and outlet links to each other with the pond pump entrance with heat transfer tube, and fans entrance places atmosphere, forms circulating cooling system; Nitrogen storage tank is connected to form the medium supply system with house steward in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101587658A CN101182593A (en) | 2007-12-07 | 2007-12-07 | Gas stove outer circulation cooling method of double chamber atmosphere pressure hardening furnace and cooling system thereof |
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| CNA2007101587658A CN101182593A (en) | 2007-12-07 | 2007-12-07 | Gas stove outer circulation cooling method of double chamber atmosphere pressure hardening furnace and cooling system thereof |
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Cited By (12)
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| CN101948911A (en) * | 2010-08-27 | 2011-01-19 | 宁波基内生物技术有限公司 | Primer, kit and method for detecting Toxoplasma gondii |
| CN102534177A (en) * | 2012-03-02 | 2012-07-04 | 攀钢集团西昌钢钒有限公司 | Continuous annealing unit and circulating temperature control device for aging section of continuous annealing unit |
| CN103045813A (en) * | 2012-12-14 | 2013-04-17 | 湘潭高耐合金制造有限公司 | Cooling device for gas shielded copper wire vacuum annealing furnace and cooling method |
| CN105066716A (en) * | 2015-07-28 | 2015-11-18 | 中国恩菲工程技术有限公司 | Waste heat recycling method of reduction furnace |
| CN105369018A (en) * | 2015-12-17 | 2016-03-02 | 西南铝业（集团）有限责任公司 | Use method of glowing furnace |
| CN106148666A (en) * | 2016-08-24 | 2016-11-23 | 杭州西姆森机械有限公司 | A kind of pair of air-flow quickly cools down the deep freezer of saw band continuous quenching |
| CN107058687A (en) * | 2017-04-10 | 2017-08-18 | 遵义顺峰汽车零部件制造有限公司 | Heat-treatment part cooling device |
| CN107262700A (en) * | 2017-08-03 | 2017-10-20 | 新兴铸管股份有限公司 | Cast tube cooling system |
| CN108396124A (en) * | 2018-02-06 | 2018-08-14 | 贵州大学 | Simplicity improves double nozzle liquid nitrogen spray experiment devices of quenching velocity |
| CN108436024A (en) * | 2018-05-10 | 2018-08-24 | 嘉兴市乍浦杭湾重型机械有限公司 | A kind of quickly cooling device of high-temperature forging |
| CN113373286A (en) * | 2021-05-28 | 2021-09-10 | 吴江市新申铝业科技发展有限公司 | Liquid nitrogen cooling quenching equipment for aluminum alloy section extrusion production and aluminum alloy section cooling quenching process |
| CN115109911A (en) * | 2022-06-28 | 2022-09-27 | 江苏金源高端装备股份有限公司 | Flange forging heat treatment device and process for wind power generation equipment with uniform fire |
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2007
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101948911A (en) * | 2010-08-27 | 2011-01-19 | 宁波基内生物技术有限公司 | Primer, kit and method for detecting Toxoplasma gondii |
| CN102534177A (en) * | 2012-03-02 | 2012-07-04 | 攀钢集团西昌钢钒有限公司 | Continuous annealing unit and circulating temperature control device for aging section of continuous annealing unit |
| CN103045813A (en) * | 2012-12-14 | 2013-04-17 | 湘潭高耐合金制造有限公司 | Cooling device for gas shielded copper wire vacuum annealing furnace and cooling method |
| CN103045813B (en) * | 2012-12-14 | 2015-01-07 | 湘潭高耐合金制造有限公司 | Cooling device for gas shielded copper wire vacuum annealing furnace and cooling method |
| CN105066716A (en) * | 2015-07-28 | 2015-11-18 | 中国恩菲工程技术有限公司 | Waste heat recycling method of reduction furnace |
| CN105066716B (en) * | 2015-07-28 | 2018-02-02 | 中国恩菲工程技术有限公司 | The method that afterheat of reducing furnace recycles |
| CN105369018A (en) * | 2015-12-17 | 2016-03-02 | 西南铝业（集团）有限责任公司 | Use method of glowing furnace |
| CN106148666B (en) * | 2016-08-24 | 2018-08-07 | 杭州西姆森机械有限公司 | A kind of double air-flows are quickly cooled down the deep freezer of saw band continuous quenching |
| CN106148666A (en) * | 2016-08-24 | 2016-11-23 | 杭州西姆森机械有限公司 | A kind of pair of air-flow quickly cools down the deep freezer of saw band continuous quenching |
| CN107058687A (en) * | 2017-04-10 | 2017-08-18 | 遵义顺峰汽车零部件制造有限公司 | Heat-treatment part cooling device |
| CN107262700A (en) * | 2017-08-03 | 2017-10-20 | 新兴铸管股份有限公司 | Cast tube cooling system |
| CN108396124A (en) * | 2018-02-06 | 2018-08-14 | 贵州大学 | Simplicity improves double nozzle liquid nitrogen spray experiment devices of quenching velocity |
| CN108396124B (en) * | 2018-02-06 | 2020-08-25 | 贵州大学 | Double-nozzle liquid nitrogen injection experimental device capable of simply and conveniently improving quenching speed |
| CN108436024A (en) * | 2018-05-10 | 2018-08-24 | 嘉兴市乍浦杭湾重型机械有限公司 | A kind of quickly cooling device of high-temperature forging |
| CN113373286A (en) * | 2021-05-28 | 2021-09-10 | 吴江市新申铝业科技发展有限公司 | Liquid nitrogen cooling quenching equipment for aluminum alloy section extrusion production and aluminum alloy section cooling quenching process |
| CN115109911A (en) * | 2022-06-28 | 2022-09-27 | 江苏金源高端装备股份有限公司 | Flange forging heat treatment device and process for wind power generation equipment with uniform fire |
| CN115109911B (en) * | 2022-06-28 | 2023-10-20 | 江苏金源高端装备股份有限公司 | Flange forging heat treatment device and process for wind power generation equipment with uniform firepower |
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Open date: 20080521 |