CN101397646A - Muffleless can-type gas nitriding furnace - Google Patents
Muffleless can-type gas nitriding furnace Download PDFInfo
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- CN101397646A CN101397646A CNA2007100613195A CN200710061319A CN101397646A CN 101397646 A CN101397646 A CN 101397646A CN A2007100613195 A CNA2007100613195 A CN A2007100613195A CN 200710061319 A CN200710061319 A CN 200710061319A CN 101397646 A CN101397646 A CN 101397646A
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- furnace
- gas nitriding
- radiator tube
- nitriding furnace
- muffle pot
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Abstract
The invention discloses a structure of a novel type gas nitriding furnace, namely no muffle tank gas nitriding furnace and a manufacturing method thereof. The invention, inside which a metallic electrothermal radiant tube is arranged, provides convenience for increasing the furnace pressure of gas nitriding and gas soft-nitriding, thereby increasing the permeating rate and realizing continuous production of gas nitriding and the maximization of gas nitriding equipment.
Description
One, technical field: the no Muffle pot gas nitriding furnace that the present invention relates to belongs to a kind of Equipment for Heating Processing in the mechanical manufacturing field.
Two, background technology: the gas nitriding furnace of common use all contains Muffle pot in the industrial production at present, the typical structure of this type of furnace as shown in Figure 1, this type of furnace is made up of following major parts, and wherein 1: be Muffle pot lid (asbestos packing sealing or water-cooled rubber seal); 2 is Muffle pot; 3 is furnace shell; 4 is thermal insulation layer; 5 is resistance wire (resistive band) heating element.During operation workpiece and suspender are put into Muffle pot, build the Muffle pot lid, heating element heats Muffle pot from the Muffle pot outside subsequently, and its heat is passed to a jar interior medium and a workpiece again by the Muffle pot wall.During cooling, stop heating, lower the temperature by Muffle pot outer wall and atmospheric heat exchange.By processing requirement nitriding medium is fed in the stove by inlet pipe during operation, under the condition of slight malleation, unnecessary gas is outside the vapor pipe drain tank in keeping Muffle pot.Finish into workpiece at nitriding process and must be cooled to 200 ℃ coming out of the stove, this temperature-fall period is to realize by the outside surface of Muffle pot and atmospheric heat exchange.This have Muffle pot formula gas nitriding furnace that following shortcoming is arranged:
One, this type of furnace are difficult to improve furnace pressure, because the interior the pressure how working temperature of Muffle pot generally at 500-700 ℃, makes Muffle pot (casting or welding fabrication) bear 100-300kpa reliably and with long-term then is a difficult problem.
Two, this type of furnace requires Muffle pot to be greater than the size of workpiece forever, and the manufacturing of warp-wise large size or axial large-sized Muffle pot all will face technical many difficult problems.
Three, this type of furnace has hindered the development of gas nitriding and gas soft nitriding serialization operation technique and equipment.
Four, summary of the invention
According to the growth requirement of gas under pressure nitriding and gas under pressure soft-nitriding process and at many shortcomings of traditional gas nitriding furnace, the present invention develops Muffleless can-type gas nitriding furnace.The typical structure of this type of furnace as shown in Figure 2, wherein 1 is bell, 2 is water-cooled rubber seal locking mechanism, 3 is furnace shell, 4 is thermal insulation layer, 5 is the metal electric heating radiator tube.
Can see the structure difference of these two kinds of type of furnaces significantly by the contrast of accompanying drawing 1,2.The gaseous media of the former nitriding is sealed in the Muffle pot, the latter is sealed in furnace shell with interior space with gaseous media, this moment, the temperature of furnace shell was room temperature+10-15 ℃, promptly≤50 ℃, therefore furnace shell material adopts carbon steel to satisfy the demands, even if bear the interior pressure of 100-300kpa for a long time, this will be simple possible for pressurized vessel.
When the pressure in the stove was 100-300kpa, what the metal radiator tube bore was external pressure, and in the high temperature steel permission use temperature scope (800 ℃) of correspondence, wall thickness is that the seamless tube of 3-4mm all can satisfy above-mentioned working conditions.
In sum, the present invention has created favourable condition for improving furnace pressure.This on the other hand novel furnace all will be very easily to manufacturing and designing bell-type gas nitriding furnace and horizontal gas nitriding furnace and continous way gas nitriding furnace.
The metal electric heating radiator tube has following two big features among the present invention:
One: this radiator tube not only provides thermal source for equipment, and be the device of realizing the nitriding furnace fast cooling, this function is seen accompanying drawing 3, wherein 1 is the metal radiator tube, 2 is pottery resistance silk carriage, 3 vitrified pipes, and 4 is blast pipe (being the centring tube of heating element simultaneously), 5 is lagging material, 6 is exhaust duct, and during heating, blast pipe plays pottery is hindered carriage, vitrified pipe, the localized effect of lagging material and resistance wire is no matter radiator tube is horizontally disposed, be arranged vertically, opening faces upward or downward, these subassemblies do not allow to be free to slide, and guarantee the reliable insulation between resistance wire and the radiator tube like this.When cooling, pressurized air is blown into by the outer end of blast inlet, get back to air outlet along space reverse direction flow in the pipe behind the arrival radiator tube innermost and drain into atmosphere, the blast height, distinguished and admirable speed is big more, it is fast that the heat exchange of air and tube wall is also carried out, fast thereby furnace temperature is also fallen, thereby cooling rate also can be included the controlled process parameter area in.
Its two: the outside surface of the metal radiator tube among the present invention has applied enamel, avoiding contacting of high temperature steel radiator tube and ammonia, thereby the work-ing life of service life of radiant tubes.
Five, embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
Accompanying drawing 4 is the structural representation of a well formula Muffleless can-type gas nitriding furnace, and wherein 1 is bell, and 2 is bell water-cooled rubber seal locking mechanism, and 3 is furnace shell, and 4 is air guiding sleeve, and 5 is the metal electric heating radiator tube, and 6 is impeller, and 7 is thermal insulation layer.
At first carry out overall design according to burner hearth shape, size and maximum heating power, thereby determine length, quantity and the distributing position of furnace shell, bell, thermal insulation layer, radiator tube, the concrete parameter and the drawing of key components and parts such as air guiding sleeve, impeller, and by figure processing respectively.
The main points of this type of furnace construction are to guarantee the quality of furnace shell and radiator tube.Will carry out the water test (test pressure is more than 2 times of design effort pressure) after furnace shell, bell (comprising water-cooled rubber seal locking mechanism) completion of processing, also will carry out the leak detection under the negative pressure after the water test, halogen leak detector is adopted in leak detection; Press figure perforate (weld bond of radiator tube and furnace shell) thereafter, the production of radiator tube comprises two contents, the first is pressed the air pressure leak detection for 0.3-0.5Mpa with radiator tube welding forming (must adopt argon arc welding) and in doing, treat to change the enamel operation over to after qualified, its glaze should intactly cover the radiator tube outside surface.Change the assembling of radiation-tube emitter and intake and exhaust pipeline then over to, every radiator tube all needs to carry out the blowing test of insulation test and inlet pipe, vapor pipe.The exterior applications plotting paper of qualified radiator tube is done the cover protection, in order to avoid porcelain is fallen in collision.
Promptly carry out general assembly after hours above-mentioned.At first carry out the filling of thermal insulation layer by design requirements, then with in the pre-opened hole of radiator tube by insertion furnace shell in the stove, by the argon arc welding welding of drawing, treat radiator tube all welding finish bell and locking on the bonnet, in stove, charge into the pressurized air leak detection then, this stove was paid electric adjustment after this preface finished, and brickwork work is finished.
Five, description of drawings
Fig. 1 is the exemplary block diagram of the gas nitriding furnace type of furnace of common use.
Fig. 2 is the exemplary block diagram of the Muffleless can-type gas nitriding furnace type of furnace of the present invention.
Fig. 3 is that the device of realizing the nitriding furnace fast cooling can be schemed.
Fig. 4 is the structural representation of a well formula Muffleless can-type gas nitriding furnace.
Claims (3)
1, a kind of no Muffle pot gas nitriding furnace, it is made up of furnace shell, bell, metal electric heating radiator tube and thermal insulation layer, and this equipment does not have leakage under the pneumatic testing condition of 0-300kpa.
2, the heating function that the no Muffle pot gas nitriding furnace that requires as right 1, its metal electric heating radiator tube not only have conventional radiator tube and had has fast cooling function simultaneously, and its constitutional features is seen accompanying drawing 1.
3, the no Muffle pot gas nitriding furnace that requires as right 1,2, the outside surface coating enamel of its metal electric heating radiator tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100613195A CN101397646A (en) | 2007-09-30 | 2007-09-30 | Muffleless can-type gas nitriding furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100613195A CN101397646A (en) | 2007-09-30 | 2007-09-30 | Muffleless can-type gas nitriding furnace |
Publications (1)
| Publication Number | Publication Date |
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| CN101397646A true CN101397646A (en) | 2009-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100613195A Pending CN101397646A (en) | 2007-09-30 | 2007-09-30 | Muffleless can-type gas nitriding furnace |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831603A (en) * | 2010-05-24 | 2010-09-15 | 西峡县中嘉合金材料有限公司 | Heat energy recycling device for nitriding furnaces |
| CN102288031A (en) * | 2011-07-21 | 2011-12-21 | 广东世创金属科技有限公司 | Muffle-tank structure with multi-path temperature control for thermally-stimulated furnace |
| CN102758167A (en) * | 2012-07-16 | 2012-10-31 | 浙江长兴奇伟工业炉制造有限公司 | Fully-sealed carburization nitriding furnace |
| CN103074573A (en) * | 2013-02-20 | 2013-05-01 | 天津市天瑞硬化工程有限公司 | Horizontal non-muffle-tank gas nitriding furnace |
| CN103225012A (en) * | 2013-05-15 | 2013-07-31 | 湖南新新线缆有限公司 | Numerical control type micro-pressure gas cold-heat circulating annealing furnace |
| CN103643199A (en) * | 2013-12-13 | 2014-03-19 | 东北大学 | Pressure nitrogenization furnace |
| CN106756762A (en) * | 2016-12-22 | 2017-05-31 | 青岛农业大学 | A kind of preparation method of the austenitic stainless steel blade blade of fruit juice mixer 304 |
-
2007
- 2007-09-30 CN CNA2007100613195A patent/CN101397646A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831603A (en) * | 2010-05-24 | 2010-09-15 | 西峡县中嘉合金材料有限公司 | Heat energy recycling device for nitriding furnaces |
| CN102288031A (en) * | 2011-07-21 | 2011-12-21 | 广东世创金属科技有限公司 | Muffle-tank structure with multi-path temperature control for thermally-stimulated furnace |
| CN102288031B (en) * | 2011-07-21 | 2014-04-09 | 广东世创金属科技有限公司 | Muffle-tank structure with multi-path temperature control for thermally-stimulated furnace |
| CN102758167A (en) * | 2012-07-16 | 2012-10-31 | 浙江长兴奇伟工业炉制造有限公司 | Fully-sealed carburization nitriding furnace |
| CN103074573A (en) * | 2013-02-20 | 2013-05-01 | 天津市天瑞硬化工程有限公司 | Horizontal non-muffle-tank gas nitriding furnace |
| CN103225012A (en) * | 2013-05-15 | 2013-07-31 | 湖南新新线缆有限公司 | Numerical control type micro-pressure gas cold-heat circulating annealing furnace |
| CN103225012B (en) * | 2013-05-15 | 2014-10-22 | 湖南新新线缆有限公司 | Numerical control type micro-pressure gas cold-heat circulating annealing furnace |
| CN103643199A (en) * | 2013-12-13 | 2014-03-19 | 东北大学 | Pressure nitrogenization furnace |
| CN103643199B (en) * | 2013-12-13 | 2016-02-24 | 东北大学 | A kind of Pressure nitrogenization furnace |
| CN106756762A (en) * | 2016-12-22 | 2017-05-31 | 青岛农业大学 | A kind of preparation method of the austenitic stainless steel blade blade of fruit juice mixer 304 |
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Open date: 20090401 |