CN114410945B - Online accurate strengthening heat treatment device for medium and small-caliber stainless steel corrugated pipes - Google Patents
Online accurate strengthening heat treatment device for medium and small-caliber stainless steel corrugated pipes Download PDFInfo
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- CN114410945B CN114410945B CN202210006705.9A CN202210006705A CN114410945B CN 114410945 B CN114410945 B CN 114410945B CN 202210006705 A CN202210006705 A CN 202210006705A CN 114410945 B CN114410945 B CN 114410945B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
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Abstract
The invention relates to an online accurate strengthening heat treatment device for medium and small-caliber stainless steel corrugated pipes. The spiral air sealing unit is positioned on the inlet side of the equipment and is connected with one end of the induction heating unit; the graded cooling unit is positioned at the other end of the induction heating unit; the supporting units are respectively arranged at the bottoms of the spiral air sealing unit and the grading cooling unit; the cold air circulating unit is connected between the two ends of the grading cooling unit; the invention solves the problems that the prior equipment can not cool the wave trough in a reinforced way and the wave trough cooling efficiency is low, and the spiral air seal unit and the grading cooling unit are of a splicing type and can carry out online grading cooling on the medium-small diameter stainless steel corrugated pipe according to a preset cooling path, thereby obviously improving the uniformity of the corrugated pipe in the circumferential direction and the mechanical property of the wave trough area while ensuring the brightening effect and ensuring the comprehensive quality and the fatigue life of the corrugated pipe after heat treatment.
Description
Technical Field
The invention relates to the technical field of corrugated pipe heat treatment equipment, in particular to an online accurate strengthening heat treatment device for small and medium-caliber stainless steel corrugated pipes.
Background
The medium and small-caliber stainless steel corrugated pipe is a cylindrical thin-wall elastic pipe with transverse corrugations, and has ideal bending flexibility and periodic change characteristics, so that mutual displacement of the connecting ends of pipelines or machines and equipment can be compensated, vibration energy is absorbed, and the effects of noise reduction and shock absorption are achieved, so that the medium and small-caliber stainless steel corrugated pipe is widely applied to relevant industries such as aerospace, automobiles and the like. The caliber of the wave-shaped antenna is generally in the range of DN10-DN50, and the wave-shaped antenna is composed of nodes with consistent continuous wave shapes, wherein the nodes are provided with inward wave troughs, outward wave crests and transition regions arranged between the wave troughs and the wave crests. Taking the medium and small-caliber stainless steel corrugated pipe formed by spinning and rolling as an example, the wave trough is subjected to radial and circumferential compressive stresses in the multi-pass spinning and rolling forming process, and metal flows in the wave trough under the action of the compressive stresses, so that the wall thickness of the wave trough is continuously increased. Different from the reduction of the wall thickness of the wave trough of the traditional corrugated pipe forming mode, the wall thickness of the wave trough can be increased after the rotary pressing and roll forming.
Through carrying out solution heat treatment on the stainless steel corrugated pipe, cooling at a fast cooling speed of 200-350 ℃/s can obviously improve the microstructure and mechanical property of the corrugated pipe and prolong the fatigue life of the corrugated pipe. The traditional stainless steel corrugated pipe with medium and small caliber mainly adopts offline light quantification heat treatment equipment such as a mesh belt heat treatment furnace, a tubular heat exchanger and the like, the environment temperature is ensured through a circulating water jacket, N2 or N2+ H2 is adopted as cooling protective gas to cool the stainless steel corrugated pipe, and the heat exchange process mainly comprises large-range gas convection heat exchange and metal surface radiation heat exchange in space. Because the opening of bellows nodal is the gradual shrinkage form, and the clearance is less and the trough is darker between the adjacent crest of outer ripple, and circulation air conditioning hardly gets into constrictive trough region, leads to trough cooling efficiency to be less than crest and transition region on the contrary. The combined effect of insufficient cooling capacity of the wave trough and the increase of the wall thickness of the wave trough caused by the spinning-rolling process causes the thermal treatment fatigue property of the corrugated pipe to be obviously lower than that of the wave crest region, thereby becoming a bottleneck for limiting the improvement of the fatigue property of the corrugated pipe.
Disclosure of Invention
In view of the above problems, the present invention aims to provide an online precise strengthening heat treatment apparatus for medium and small diameter stainless steel corrugated pipes, which adopts an induction rapid heating and forced cooling manner, and combines an autonomously designed three-stage active dynamic sealing structure, a slit annular cooling structure, a graded cooling unit arrangement, a self-cooling gas circulation structure, etc. to realize controllable cooling of corrugated pipe corrugated structures and forced heat exchange of trough regions.
The technical scheme adopted by the invention is as follows:
the invention provides an online precise strengthening heat treatment device for small and medium-caliber stainless steel corrugated pipes, which comprises a spiral air seal unit, an induction heating unit, a grading cooling unit, a supporting unit and a cold air circulating unit, wherein the spiral air seal unit is arranged on the middle-caliber stainless steel corrugated pipe; the spiral air sealing unit and the grading cooling unit are respectively connected to the inlet side and the outlet side of the induction heating unit; the supporting units are respectively arranged at the bottoms of the spiral air sealing unit and the grading cooling unit;
the induction heating unit comprises a quartz tube and an induction heating coil; the induction heating coils are coaxially and uniformly wound on the outer wall of the quartz tube at intervals; the inlet side and the outlet side of the quartz tube are respectively connected with the spiral gas seal unit and the grading cooling unit;
the graded cooling unit comprises a graded cooling unit front end cover, a sealing structure partition ring, an annular end cover, a thin graphite gasket, a plurality of annular cooling box bodies, a circumferential gap adjusting ring, an adjusting ring sealing ring, a fastening screw plug, a middle air duct, a spliced cooling box body, a thick graphite gasket, a water-cooled tube, an outlet end cover, an air inlet tube, a cooling water jacket, an water inlet tube, an water outlet tube and a cooling water jacket air outlet tube; the cooling box bodies are coaxially and fixedly connected through flanges in sequence, and coaxial thick graphite gaskets are arranged between the connecting parts; the annular end cover is coaxially and fixedly connected to the front end of the first section of the cooling box body; the front end cover of the grading cooling unit is coaxially and fixedly connected to the front end of the annular end cover; the thin graphite gasket is coaxially arranged between the annular end cover and the joint of the first section of the cooling box body; a sealing structure isolating ring is arranged on the inner side of the circumference of one end, close to the annular end cover, of the front end cover of the grading cooling unit; the side wall of the middle part of the cooling box body is provided with an annular flow-equalizing cavity with a reversed L-shaped cross section, and the inner end of a vertical cavity of the annular flow-equalizing cavity is communicated with the inside of the cooling box body; the circumferential gap adjusting rings are respectively arranged on two sides of the inner circumference of the vertical cavity of the annular flow equalizing cavity; an adjusting ring sealing ring is arranged between the circumferential gap adjusting ring and the side wall of the cooling box body; the circumferential gap adjusting ring is fixed on the inner wall of the cooling box body in the circumferential direction through a fastening screw plug arranged on the outer side of the circumferential gap adjusting ring, and the gap adjusting amount is 0.2-2mm; the circumference of the air inlet pipe is uniformly distributed on the side wall of the cooling box body, the inner end of the air inlet pipe is communicated with the horizontal cavity of the annular flow-equalizing cavity, and the inner diameter sectional area of the air inlet pipe is larger than the area of an outlet between the two circumferential gap adjusting rings; the circumferences of the middle gas guide pipes are uniformly distributed on the side wall of the cooling box body, and the inner ends of the middle gas guide pipes are communicated with the inside of the cooling box body; the cooling water jacket is fixedly connected to the outer circumferential surface of the cooling box body; the outlet side of the quartz tube is coaxially and fixedly connected with the front end cover of the grading cooling unit; the outlet end cover is coaxially and fixedly connected to the outlet side of the tail cooling box body; the top of the outlet end cover is connected with the lower end of the water cooling pipe; an infrared thermometer is arranged at the upper end of the water cooling pipe;
the cooling water jacket is formed by splicing two semicircular rings, the interior of the cooling water jacket is of a double-layer circular heat exchange cavity structure, and heat exchange fins are arranged in the heat exchange cavity; water inlet pipes are arranged on two sides of the upper part of the cooling water jacket, and water outlet pipes are arranged on two sides of the lower part of the cooling water jacket; one end of the water inlet pipe is communicated with the outside, and the other end of the water inlet pipe is communicated with the inner-layer heat exchange cavity of the cooling water jacket; one end of the water outlet pipe is communicated with the outside, and the other end of the water outlet pipe is communicated with the inner-layer heat exchange cavity of the cooling water jacket; the air outlet pipes are arranged on the left side and the right side of the cooling water jacket, one end of each air outlet pipe is communicated with the outside, and the other end of each air outlet pipe is communicated with the outer-layer heat exchange cavity of the cooling water jacket; the outer end of the air inlet pipe penetrates through the cooling water jacket to be communicated with the outside; the outer end of the middle gas guide pipe is communicated with the outer layer heat exchange cavity of the cooling water jacket;
the supporting unit comprises a splicing block and a supporting frame; the splicing blocks are fixedly connected to the upper part of the support frame; the splicing blocks are attached to the bottoms of the spiral air sealing unit and the grading cooling unit; symmetrical through holes are formed in two sides of the bottom end of the support frame, and T-shaped bolts are installed in the through holes;
the cold air circulating unit is arranged outside the grading cooling unit, one end of the cold air circulating unit is connected with an air inlet pipe of the first section of cooling box body, and the other end of the cold air circulating unit is connected with an air outlet pipe of a cooling water jacket outside the last section of cooling box body.
Furthermore, the spiral air seal unit comprises a front end cover, a cylindrical air seal main body structure, a spiral purging pipe, a purging structure partition ring, an exhaust pipe, a sealed air inlet pipe, a sealing structure partition ring, a sealed graphite gasket and a rear end cover; the air seal main body structure blocks air from entering a heating and cooling area through the grading seal cavity; the front end cover and the rear end cover are respectively and coaxially fixedly connected to the front end and the rear end of the air seal main body structure, and a sealing graphite gasket is arranged between the rear end cover and the rear end of the air seal main body structure; the interior of the air seal main body structure is sequentially provided with a primary cavity, a secondary cavity and a tertiary cavity from an inlet side to an outlet side; the spiral purging pipes are uniformly distributed on the side wall of the primary cavity at the circumference, and two ends of the spiral purging pipes are respectively communicated with the outside and the inside of the primary cavity; the blowing structure isolating ring is arranged between the primary cavity and the secondary cavity; the exhaust pipes are uniformly distributed on the side wall of the secondary cavity in the circumferential direction, and two ends of the exhaust pipes are respectively communicated with the outside and the inside of the secondary cavity; the sealed air inlet pipes are uniformly distributed on the side wall of the three-stage cavity in the circumference, and two ends of the sealed air inlet pipes are respectively communicated with the outside and the inside of the three-stage cavity; the sealing structure isolating ring is arranged at the tail end of the three-stage cavity; and the inlet side of the quartz tube is coaxially and fixedly connected with the rear end cover.
Furthermore, the inner hole of the front end cover is in a circular truncated cone shape, the diameter of the inlet side is larger than that of the outlet side, the cone angle is 3-10 degrees, the side curve is in an involute form, and the inner end of the side curve corresponds to the blowing structure isolating ring.
Furthermore, 3-8 spiral purging pipes are uniformly arranged along the circumferential direction of the primary cavity, and the rotation inclination angle of the spiral purging pipes is 3-10 degrees; 3-8 air exhaust pipes are uniformly arranged along the circumferential direction of the secondary cavity; a plurality of annular rectangular tooth-shaped concave channels are formed in a secondary cavity of the air seal main body structure, the depth of each concave channel is 5-8mm, 3-8 independent flow channels are embedded in the air seal main body structure and are respectively connected with the annular rectangular tooth-shaped concave channels, and an external negative pressure power source pumps air at the wave trough of the corrugated pipe out of the concave channels through the flow channels, so that secondary exhaust is realized; 3-8 sealed air inlet pipes are uniformly arranged along the circumferential direction of the three-stage cavity; the diameter of the inner hole of the blowing structure partition ring is 0.5-1.0mm larger than that of the sealing structure partition ring, so that high-speed discharge of gas from the inlet side is ensured.
Furthermore, the grading seal cavity of the spiral air seal unit can be sequentially added with two-stage and three-stage cavity structure parts according to the seal grade requirement, and is expanded into an N-stage seal cavity structure.
Further, the cross section of the induction heating coil is rectangular or circular; the diameter of the quartz tube is 1.2-1.5 times of the outer diameter of the corrugated tube; the gap between the induction heating coil and the quartz tube is 0.3-1.0 mm.
Further, the distance between the air inlet pipe in the horizontal cavity of the annular flow equalizing cavity and the vertical cavity is 1/3 of the total width of the cooling box body; 4-8 air inlet pipes are uniformly arranged in the middle of the cooling box body along the circumferential direction.
Furthermore, the number of the sections of the cooling box body can be adjusted according to a preset cooling path, and the cooling box body is expanded into an N-level cooling unit structure.
Further, the cold air circulating unit comprises a gas distribution exhaust, a valve, a gas booster and a gas cooler; the gas distribution row is connected with a first section of cooling box body gas inlet pipe; the air inlet end of the gas booster is connected with an air outlet pipe of a cooling water jacket outside the last section of cooling box body through a valve; the inlet side of the gas cooler is connected with the gas outlet end of the gas booster; the outlet side of the gas cooler is connected to a gas distribution row; the added cooling gas is discharged from the gas distribution unit and enters the grading cooling unit.
Further, the cooling gas is NH3 decomposition gas or nitrogen or hydrogen, and the temperature of the cooling gas is 0-25 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1. the corrugated pipe cooling mode is changed from an off-line cooling mode to an on-line cooling mode through the rapid heating mode of the induction heating coil and the jet forced heat exchange structure, and the production efficiency of the corrugated pipe is greatly improved.
2. Through adjusting the thickness and the position of the circumferential gap adjusting ring, cold air can flow through the gamma-shaped annular flow equalizing cavity of each section of cooling box body in sequence, the adjustment of the height and the amount of the spraying gap is realized while the uniform cooling in the circumferential direction is ensured, and thus the effective reinforced cooling of the difficult-to-spray trough areas of corrugated pipes with different pipe diameters and wave pitches is achieved.
3. The ineffective cold air of the last section of cooling box body is recycled for the second time through the self-circulation cooling of the cooling water jacket between the cooling box bodies and the cold air circulation unit, and enters the first section of cooling box body again after pressurization, cooling and redistribution, so that the effects of saving cold air and greening are achieved.
4. The grading cooling unit comprises a first section of cooling box body and a plurality of spliced cooling box bodies, and can carry out grading cooling on the corrugated pipe according to a preset cooling path.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic cross-sectional front view of the present invention;
FIG. 3 is a schematic view of a partial cross-sectional structure of the spiral gas seal unit of the present invention;
FIG. 4 is a schematic front view of a partial cross-sectional structure of the spiral gas sealing unit of the present invention;
FIG. 5 is a partial schematic view of the air seal body structure of FIG. 4;
FIG. 6 is a side view, partially in section, of the staged cooling unit of the present invention;
FIG. 7 is a schematic view of the circumferential slot adjusting ring of the present invention;
FIG. 8 is a schematic sectional view of a cooling water jacket according to the present invention;
FIG. 9 is a schematic view of the structure of a cooling cycle unit and the cooling cycle principle of the present invention.
Wherein, the reference numbers: 1. a spiral gas seal unit; 2. an induction heating unit; 3. a staged cooling unit; 4. a supporting unit; 5. a bellows; 6. a cold air circulating unit; 11. a front end cover; 12. a cylindrical air seal main body structure; 13. a spiral purge tube; 14. a purging structure partition ring; 15. an air exhaust pipe; 16. sealing the air inlet pipe; 17. a seal structure blocking ring; 18. sealing the graphite gasket; 19. a rear end cap; 21. a quartz tube; 22. an induction heating coil; 31. a front end cover of the grading cooling unit; 32. an annular end cap; 33. a thin graphite gasket; 34. a first section of cooling box body; 35. a circumferential gap adjusting ring; 36. adjusting a ring seal; 37. fastening a screw plug; 38. a middle gas-guide tube; 39. splicing the cooling box bodies; 310. a thick graphite gasket; 311. a water-cooled tube; 312. an outlet end cap; 313. the inverted L-shaped annular flow equalizing cavity; 314. an air inlet pipe; 315. a cooling water jacket; 316. a water inlet pipe; 317. an air outlet pipe of the cooling water jacket; 318. a water outlet pipe; 41. splicing blocks; 42. a support frame; 61. gas distribution and discharge; 62. a valve; 63. a gas booster; 64. a gas cooler.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
It should be noted that in the description of the present invention, it should be noted that the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, and do not mean that a device or an element must have a specific orientation, be configured and operated in a specific orientation.
Referring to fig. 1 to 9, a specific structure of an embodiment of an online precision strengthening heat treatment device for medium and small-caliber stainless steel corrugated pipes according to the present invention is shown. The device comprises a spiral air sealing unit 1, an induction heating unit 2, a grading cooling unit 3, a supporting unit 4 and a cold air circulating unit 6; the spiral gas seal unit 1 and the grading cooling unit 3 are respectively connected to the inlet side and the outlet side of the induction heating unit 2; the supporting units 4 are respectively arranged at the bottoms of the spiral air sealing unit 1 and the grading cooling unit 3; the pipe diameter of the corrugated pipe 5 is DN12, and the traction speed is 1m/min.
The spiral gas seal unit 1 comprises a front end cover 11, a cylindrical gas seal main body structure 12, a spiral purging pipe 13, a purging structure isolating ring 14, an exhaust pipe 15, a sealing air inlet pipe 16, a sealing structure isolating ring 17, a sealing graphite gasket 18 and a rear end cover 19.
The air seal main body structure 12 blocks air from entering a heating and cooling area through a graded seal cavity, in this embodiment, a three-level seal cavity structure is arranged inside the air seal main body structure 12; the front end cover 11 and the rear end cover 19 are respectively and coaxially fixedly connected to the front end and the rear end of the air seal main body structure 12, and a sealing graphite gasket 18 is arranged between the rear end cover 19 and the rear end of the air seal main body structure 12; in this embodiment, the inner hole of the front end cover 11 is in a circular truncated cone shape, the diameter of the inlet side is larger than that of the outlet side, the cone angle is 3-10 degrees, the cone angle is 5 degrees in this embodiment, the side curve form is an involute form, and the inner end of the side curve form corresponds to the blowing structure isolation ring 14;
a primary cavity, a secondary cavity and a tertiary cavity are sequentially arranged in the air seal main body structure 12 from the inlet side to the outlet side; 3-8 spiral purging pipes 13 are uniformly arranged along the circumferential direction of the primary cavity, the number of the spiral purging pipes is 4 in the embodiment, the rotation inclination angle of each spiral purging pipe 13 is 3-10 degrees, the rotation inclination angle of each spiral purging pipe is 5 degrees in the embodiment, two ends of each spiral purging pipe 13 are respectively communicated with the outside and the inside of the primary cavity, the primary cavity forms spiral airflow reverse purging and blocks gas, most of air brought by the movement of the corrugated pipe 5 is discharged, and the gas used by each spiral purging pipe 13 is air; the blowing structure isolation ring 14 is arranged between the primary cavity and the secondary cavity; 3-8 air exhaust pipes 15 are uniformly arranged along the circumferential direction of the secondary cavity, 4 air exhaust pipes are arranged in the embodiment, two ends of each air exhaust pipe 15 are respectively communicated with the outside and the inside of the secondary cavity, a plurality of annular rectangular tooth type concave channels are arranged in the secondary cavity, 3 air exhaust pipes are arranged in the embodiment, the depth of each concave channel is 5-8mm, 3-8 independent flow channels are embedded in corresponding positions in the air seal main body structure 12, 3 air exhaust pipes are arranged in the embodiment and are respectively connected with the 3 annular rectangular tooth type concave channels, and an external negative pressure power source pumps air at the wave trough positions of the corrugated pipe 5 out of the concave channels through the flow channels, so that secondary air exhaust is realized; 3-8 sealed air inlet pipes 16 are uniformly arranged along the circumferential direction of the three-stage cavity, 4 sealed air inlet pipes are arranged in the embodiment, two ends of the sealed air inlet pipes are respectively communicated with the outside and the inside of the three-stage cavity, the sealing structure blocking ring 17 is coaxially arranged at the tail end of the three-stage cavity, protective gas is reversely filled into the two-stage cavity by adopting annular uniform pressure difference, cold air is introduced into the three-stage cavity to increase the pressure of the two-stage cavity, air brought in by the corrugated pipe 5 is discharged for the third time, and the air is further blocked; the diameter of the inner hole of the blowing structure partition ring 14 is 0.5-1.0mm larger than that of the inner hole of the sealing structure partition ring 17, in the embodiment, the diameter is 1mm, and gas is guaranteed to be discharged from the inlet side at a high speed;
the grading seal cavity of the spiral gas seal unit 1 can be sequentially provided with a secondary cavity and a tertiary cavity structure according to the seal grade requirement, and meanwhile, the provided secondary cavity and tertiary cavity are correspondingly provided with structures such as an exhaust tube 15, a seal air inlet tube 16 and a seal structure isolating ring 17, so that the spiral gas seal unit 1 is expanded into an N-grade seal cavity structure.
The induction heating unit 2 includes a quartz tube 21 and an induction heating coil 22; the induction heating coils 22 are coaxially and uniformly wound around the outer side of the circumference of the quartz tube 21 at intervals; the inlet side of the quartz tube 21 is coaxially connected with the sealing graphite gasket 18 and the rear end cover 19, so that the circumferential sealing of the quartz tube 21 is realized. The section of the induction heating coil 22 is rectangular or circular, and in the present embodiment, circular; the diameter of the quartz tube 21 is 1.2-1.5 times, in the embodiment 1.2 times, of the outer diameter of the corrugated tube 5; the gap between the induction heating coil 22 and the quartz tube 21 is 0.3 to 1.0mm, in this embodiment, 0.5mm.
The graded cooling unit 3 comprises a graded cooling unit front end cover 31, a sealing structure partition ring 17, an annular end cover 32, a thin graphite gasket 33, a first section of cooling box body 34, a circumferential gap adjusting ring 35, an adjusting ring sealing ring 36, a fastening screw plug 37, a middle air duct 38, a spliced cooling box body 39, a thick graphite gasket 310, a water cooling pipe 311, an outlet end cover 312, an air inlet pipe 314, a cooling water jacket 315, an air inlet pipe 316, a cooling water jacket air outlet pipe 317 and an air outlet pipe 318;
the number of the sections of the cooling box body can be further adjusted according to a preset cooling path, and the cooling box body is expanded into an N-level cooling unit structure, in the embodiment, the cooling box body is provided with three sections, namely a first section of the cooling box body 34 and two sections of spliced cooling box bodies 39, the three sections of the cooling box bodies are coaxially and fixedly connected through flange plates in sequence, and coaxial thick graphite gaskets 310 are arranged among the connecting parts; the annular end cover 32 is coaxially and fixedly connected to the front end of the first section of the cooling box body 34; the front end cover 31 of the grading cooling unit is coaxially and fixedly connected to the front end of the annular end cover 32; the thin graphite gasket 33 is coaxially arranged between the joint of the annular end cover 32 and the first section of the cooling box body 34; a sealing structure partition ring 17 is arranged on the inner side of the circumference of one end, close to the annular end cover 32, of the front end cover 31 of the grading cooling unit; the side wall of the middle part of each section of the cooling box body is provided with an annular flow-equalizing cavity 313 with the inverted L-shaped cross section, and the inner end of a vertical cavity of the annular flow-equalizing cavity 313 is communicated with the inside of the cooling box body; the circumferential gap adjusting rings 35 are respectively arranged on the left side and the right side of the inner circumference of the vertical cavity of the annular flow-equalizing cavity; an adjusting ring sealing ring 36 is arranged between the circumferential gap adjusting ring 35 and the side wall of the cooling box body; the circumferential gap adjusting rings 35 on the two sides are fixed on the inner wall of the cooling box body in the circumferential direction through fastening screw plugs 37 arranged on the outer sides of the circumferential gap adjusting rings, and the gap adjusting amount between the circumferential gap adjusting rings 35 on the two sides is 0.2-2mm, 1mm in the embodiment; the thickness of the circumferential gap adjusting ring 35 is 5mm, and the outer circumference is 40 pi. The air inlet pipes 314 are circumferentially and uniformly distributed on the side wall of each cooling box body, the number of the air inlet pipes is 4-8, in the embodiment, 4 air inlet pipes 314 are arranged, the inner ends of the air inlet pipes 314 are communicated with the horizontal cavity of the annular flow-equalizing cavity, the distance between the air inlet pipes 314 in the horizontal cavity of the gamma-shaped flow-equalizing cavity 313 and the vertical cavity is 1/3 of the total width of the cooling box body, the distance between the air inlet pipes and the side wall of the right side of the gamma-shaped flow-equalizing cavity 313 is 2mm, and the outer ends of the air inlet pipes are provided with annular blocking and shunting plates to ensure the air injection uniformity in the circumferential direction; the inner diameter sectional area of the air inlet pipe 314 is 49 pi, and the inner diameter sectional area of the air inlet pipe 314 is larger than the area of an outlet between the two circumferential gap adjusting rings 35, so that the air inlet of the gamma-shaped annular flow equalizing cavity 313 is larger than the air outlet, and the pressurization stable injection effect is realized. The circumferential gap adjusting ring 35 capable of adjusting the height and the gap amount of the injection gap and the air inlet pipe 314 arranged in the horizontal inner side area of the gamma-shaped annular flow-equalizing cavity are combined to comprehensively realize the annular uniform gap high-pressure air injection; the number of the middle air ducts 38 is 4, the middle air ducts are circumferentially and uniformly distributed on the side wall of each section of the cooling box body, and the inner ends of the middle air ducts 38 are communicated with the interior of the cooling box body;
the cooling water jacket 315 is fixedly connected to the outer circumferential surface of each section of cooling box body; the cooling water jacket 315 is formed by splicing two semicircular rings, and the upper end and the lower end of each semicircular ring are fixedly connected through bolts and nuts; the inner parts of the two semicircular rings are of double-layer circular ring-shaped heat exchange cavity structures, heat exchange fins are arranged in the heat exchange cavities, and the height of each layer is 10mm; the left side and the right side of the upper part of the cooling water jacket 315 are provided with water inlet pipes 316, and the left side and the right side of the lower part of the cooling water jacket 315 are correspondingly provided with water outlet pipes 318; one end of the water inlet pipe 316 is communicated with the outside, and the other end is communicated with the inner-layer heat exchange cavity of the cooling water jacket 315; one end of the water outlet pipe 318 is communicated with the outside, and the other end is communicated with the inner layer heat exchange cavity of the cooling water jacket 315; the cooling water jacket air outlet pipes 317 are respectively arranged on the left side and the right side of the cooling water jacket 315, one end of each cooling water jacket air outlet pipe 317 is communicated with the outside, the other end of each cooling water jacket air outlet pipe 317 is communicated with the outer layer heat exchange cavity of the cooling water jacket 315, and the air inlet pipe 314 on the next section of cooling box body corresponds to the air outlet pipe 317 on the previous section of cooling box body; the outer end of the air inlet pipe 314 passes through the cooling water jacket 315 to be communicated with the outside; the outer end of the middle gas-guide tube 38 is communicated with the outer layer heat exchange cavity of the cooling water jacket 315; cooling water is introduced into the inner-layer heat exchange cavity, and the inner-layer heat exchange cavity is in contact with each section of cooling box body for heat exchange and ensures the ambient temperature in the cooling box body; the outer heat exchange cavity is introduced with failure cold air through the middle air duct 38, and enters the next-stage cooling box body after being cooled and heat exchanged by the fins, so that the self-cooling and multi-stage recycling of the cooling gas are realized.
The outlet side of the quartz tube 21 is coaxially and fixedly connected with the front end cover 31 of the grading cooling unit; the outlet end cover 312 is coaxially and fixedly connected to the outlet side of the last spliced cooling box body 39, and a thick graphite gasket 310 is arranged at the connection part; the top of the outlet end cover 312 is connected with the lower end of the water cooling pipe 311; and an infrared thermometer is arranged at the upper end of the water cooling pipe 311 and used for detecting the surface temperature of the cooling outlet of the corrugated pipe 5 and detecting and feeding back the amount of the cold air. The water circulation pipeline is used for reducing the environmental temperature of the infrared thermometer, so that the environmental temperature does not exceed the upper limit service temperature of the infrared thermometer, and the normal work of the infrared thermometer is ensured.
The supporting unit 4 comprises a splicing block 41 and a supporting frame 42; the splicing blocks 41 are fixedly connected to the upper part of the support frame 42; the top of the splicing block 41 is of an arc structure which is attached to the air seal main body structure 12 of the spiral air seal unit 1 and the bottom of the cooling box body of the grading cooling unit 3; the through-hole of symmetrical arrangement is seted up to support frame 42 bottom both sides, installs T type bolt in the through-hole for be connected with the slide of operation mesa.
The cold air circulating unit 6 comprises a gas distribution exhaust 61, a valve 62, a gas supercharger 63 and a gas cooler 64; the gas distribution row 61 is connected with a gas inlet pipe 314 of the first section of the cooling box body 34; the gas inlet end of the gas supercharger 63 is connected with a gas outlet pipe 317 of an external cooling water jacket 315 of the last spliced cooling box body 39 through a valve 62; the inlet side of the gas cooler 64 is connected with the gas outlet end of the gas booster 63; the outlet side of the gas cooler 64 is connected to the gas distribution row 61; the externally added cooling gas enters the grading cooling unit 3 from the gas distribution row 61 through the gas inlet pipe 314 of the first section of the cooling box body 34; the cooling gas is NH3 decomposition gas or nitrogen or hydrogen, and the temperature of the cooling gas is 0-25 ℃.
The working principle of the invention is as follows: the corrugated pipe 5 firstly enters the spiral air sealing unit 1 under the action of a traction device, the whirling airflow generated in the primary cavity of the spiral air sealing unit 1 discharges most of air brought by the corrugated pipe 5, the secondary cavity of the spiral air sealing unit 1 pumps air out of the annular rectangular tooth-shaped concave channel through an external air pump to realize secondary exhaust, the tertiary cavity of the spiral air sealing unit 1 discharges residual air through pressurization to realize air sealing at an inlet, then the residual air enters the induction heating unit 2 to be annealed and heat treated to eliminate residual stress generated by cold machining, then the residual air enters the grading cooling unit 3 to be cooled on line, the adjustment of the height and the gap amount of a spraying gap is realized by changing the thickness and the position of the circumferential gap adjusting ring 35, so that the effective cooling of a region with difficult spraying and stress concentration is realized, meanwhile, the cooling speed of each section of cooling box and the cooling speed of a cold air flow mode can be accurately controlled by considering the traction speed of the corrugated pipe 5, the grading cooling speed at different stages is controlled, the surface temperature of the outlet surface of the corrugated pipe 5 is monitored by an infrared thermometer at the outlet end cover 312, the detection and feedback adjustment of the cold air consumption of the cooling unit 315, the circulation cooling unit, the comprehensive phase change of the corrugated pipe can be realized, and the comprehensive phase change of the green water jacket and the comprehensive water jacket can be utilized, and the comprehensive utilization of the comprehensive water jacket can be realized, and the comprehensive utilization of the comprehensive energy-saving material can be improved.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (10)
1. The utility model provides an online accurate intensive heat treatment device of medium and small-diameter stainless steel bellows which characterized in that: the device comprises a spiral air sealing unit, an induction heating unit, a grading cooling unit, a supporting unit and a cold air circulating unit; the spiral air sealing unit and the grading cooling unit are respectively connected to the inlet side and the outlet side of the induction heating unit; the supporting units are respectively arranged at the bottoms of the spiral air sealing unit and the grading cooling unit;
the induction heating unit comprises a quartz tube and an induction heating coil; the induction heating coil is coaxially wound on the outer wall of the quartz tube at uniform intervals; the inlet side and the outlet side of the quartz tube are respectively connected with the spiral gas sealing unit and the grading cooling unit;
the graded cooling unit comprises a graded cooling unit front end cover, a sealing structure partition ring, an annular end cover, a thin graphite gasket, a plurality of annular cooling box bodies, a circumferential gap adjusting ring, an adjusting ring sealing ring, a fastening screw plug, a middle air duct, a spliced cooling box body, a thick graphite gasket, a water-cooled tube, an outlet end cover, an air inlet tube, a cooling water jacket, an water inlet tube, an water outlet tube and a cooling water jacket air outlet tube; the cooling box bodies are coaxially and fixedly connected through flanges in sequence, and coaxial thick graphite gaskets are arranged between the connecting parts; the annular end cover is coaxially and fixedly connected to the front end of the first section of the cooling box body; the front end cover of the grading cooling unit is coaxially and fixedly connected to the front end of the annular end cover; the thin graphite gasket is coaxially arranged between the connecting part of the annular end cover and the first section of the cooling box body; a sealing structure isolating ring is arranged on the inner side of the circumference of one end, close to the annular end cover, of the front end cover of the grading cooling unit; the side wall of the middle part of the cooling box body is provided with an annular flow-equalizing cavity with a reversed L-shaped cross section, and the inner end of a vertical cavity of the annular flow-equalizing cavity is communicated with the inside of the cooling box body; the circumferential gap adjusting rings are respectively arranged on two sides of the inner circumference of the vertical cavity of the annular flow equalizing cavity; an adjusting ring sealing ring is arranged between the circumferential gap adjusting ring and the side wall of the cooling box body; the circumferential gap adjusting ring is fixed on the inner wall of the cooling box body in the circumferential direction through a fastening screw plug arranged on the outer side of the circumferential gap adjusting ring, and the gap adjusting amount is 0.2-2mm; the air inlet pipes are uniformly distributed on the side wall of the cooling box body in the circumferential direction, the inner ends of the air inlet pipes are communicated with the horizontal cavity of the annular flow-equalizing cavity, and the inner diameter sectional area of each air inlet pipe is larger than the area of an outlet between the two circumferential gap adjusting rings; the circumferences of the middle gas guide pipes are uniformly distributed on the side wall of the cooling box body, and the inner ends of the middle gas guide pipes are communicated with the inside of the cooling box body; the cooling water jacket is fixedly connected to the outer circumferential surface of the cooling box body; the outlet side of the quartz tube is coaxially and fixedly connected with the front end cover of the grading cooling unit; the outlet end cover is coaxially and fixedly connected to the outlet side of the tail section cooling box body; the top of the outlet end cover is connected with the lower end of the water cooling pipe; an infrared thermometer is arranged at the upper end of the water cooling pipe;
the cooling water jacket is formed by splicing two semicircular rings, the interior of the cooling water jacket is of a double-layer circular heat exchange cavity structure, and heat exchange fins are arranged in the heat exchange cavity; water inlet pipes are arranged on two sides of the upper part of the cooling water jacket, and water outlet pipes are arranged on two sides of the lower part of the cooling water jacket; one end of the water inlet pipe is communicated with the outside, and the other end of the water inlet pipe is communicated with the inner heat exchange cavity of the cooling water jacket; one end of the water outlet pipe is communicated with the outside, and the other end of the water outlet pipe is communicated with the inner heat exchange cavity of the cooling water jacket; the air outlet pipes are arranged on the left side and the right side of the cooling water jacket, one end of each air outlet pipe is communicated with the outside, and the other end of each air outlet pipe is communicated with the outer-layer heat exchange cavity of the cooling water jacket; the outer end of the air inlet pipe penetrates through the cooling water jacket to be communicated with the outside; the outer end of the middle gas guide pipe is communicated with the outer layer heat exchange cavity of the cooling water jacket;
the supporting unit comprises a splicing block and a supporting frame; the splicing blocks are fixedly connected to the upper part of the support frame; the splicing block is attached to the bottoms of the spiral air sealing unit and the grading cooling unit; symmetrical through holes are formed in two sides of the bottom end of the support frame, and T-shaped bolts are installed in the through holes;
the cold air circulating unit is arranged outside the grading cooling unit, one end of the cold air circulating unit is connected with an air inlet pipe of the first section of cooling box body, and the other end of the cold air circulating unit is connected with an air outlet pipe of a cooling water jacket outside the last section of cooling box body.
2. The on-line precise strengthening heat treatment device for the medium and small-caliber stainless steel corrugated pipes according to claim 1, characterized in that: the spiral gas seal unit comprises a front end cover, a cylindrical gas seal main body structure, a spiral purging pipe, a purging structure isolating ring, an exhaust pipe, a sealed air inlet pipe, a sealing structure isolating ring, a sealed graphite gasket and a rear end cover; the cylindrical air seal main body structure blocks air from entering a heating and cooling area through the graded seal cavity; the front end cover and the rear end cover are respectively and coaxially fixedly connected to the front end and the rear end of the cylindrical air seal main body structure, and a sealing graphite gasket is arranged between the rear end cover and the rear end of the cylindrical air seal main body structure; the interior of the cylindrical air seal main body structure is sequentially provided with a primary cavity, a secondary cavity and a tertiary cavity from an inlet side to an outlet side; the spiral purging pipes are uniformly distributed on the side wall of the primary cavity in the circumferential direction, and two ends of each spiral purging pipe are respectively communicated with the outside and the inside of the primary cavity; the blowing structure isolating ring is arranged between the primary cavity and the secondary cavity; the extraction pipes are uniformly distributed on the side wall of the secondary cavity in the circumferential direction, and two ends of the extraction pipes are respectively communicated with the outside and the inside of the secondary cavity; the sealed air inlet pipes are uniformly distributed on the side wall of the three-stage cavity in the circumference, and two ends of the sealed air inlet pipes are respectively communicated with the outside and the inside of the three-stage cavity; the sealing structure isolating ring is arranged at the tail end of the three-stage cavity; and the inlet side of the quartz tube is coaxially and fixedly connected with the rear end cover.
3. The on-line precise strengthening heat treatment device for the medium and small-caliber stainless steel corrugated pipes as claimed in claim 2, wherein: the inner hole of the front end cover is in a circular truncated cone shape, the diameter of the inlet side is larger than that of the outlet side, the cone angle is 3 to 10 degrees, the side curve is in an involute form, and the inner end of the side curve corresponds to the blowing structure isolating ring.
4. The on-line precise strengthening heat treatment device for the medium and small-caliber stainless steel corrugated pipes as claimed in claim 2, wherein: 3-8 spiral purging pipes are uniformly arranged along the circumferential direction of the primary cavity, and the rotation inclination angle of the spiral purging pipes is 3-10 degrees; 3-8 air exhaust pipes are uniformly arranged along the circumferential direction of the secondary cavity; a plurality of annular rectangular tooth-shaped concave channels are formed in a secondary cavity of the cylindrical air seal main body structure, the depth of each concave channel is 5-8mm, 3-8 independent flow channels are embedded in the cylindrical air seal main body structure and are respectively connected with the annular rectangular tooth-shaped concave channels, and an external negative pressure power source pumps air at the wave trough of the corrugated pipe out of the concave channels through the flow channels, so that secondary exhaust is realized; 3-8 sealed air inlet pipes are uniformly arranged along the circumferential direction of the three-stage cavity; the diameter of the inner hole of the blowing structure partition ring is 0.5-1.0mm larger than that of the sealing structure partition ring, and gas is guaranteed to be discharged from the inlet side at a high speed.
5. The on-line precise strengthening heat treatment device for the medium and small-caliber stainless steel corrugated pipes as claimed in claim 2, wherein: the grading seal cavity of the spiral gas seal unit can be sequentially added with two-stage and three-stage cavity structure parts according to the seal grade requirement, and is expanded into an N-stage seal cavity structure.
6. The on-line precise strengthening heat treatment device for the medium and small-caliber stainless steel corrugated pipes according to claim 1, characterized in that: the section of the induction heating coil is rectangular or circular; the diameter of the quartz tube is 1.2-1.5 times of the outer diameter of the corrugated tube; the gap between the induction heating coil and the quartz tube is 0.3-1.0 mm.
7. The on-line precise strengthening heat treatment device for the medium and small-caliber stainless steel corrugated pipes according to claim 1, characterized in that: the distance between the air inlet pipe in the horizontal cavity of the annular flow equalizing cavity and the vertical cavity is 1/3 of the total width of the cooling box body; 4-8 air inlet pipes are uniformly arranged in the middle of the cooling box body along the circumferential direction.
8. The on-line precise strengthening heat treatment device for the medium and small-caliber stainless steel corrugated pipes according to claim 1, characterized in that: the cooling box body can adjust the number of joints according to a preset cooling path and is expanded into an N-level cooling unit structure.
9. The on-line precise strengthening heat treatment device for the medium and small-caliber stainless steel corrugated pipes according to claim 1, wherein the device comprises: the cold air circulating unit comprises a gas distribution exhaust, a valve, a gas booster and a gas cooler; the gas distribution row is connected with a first section of cooling box body gas inlet pipe; the gas inlet end of the gas supercharger is connected with the gas outlet pipe of the cooling water jacket outside the last section of cooling box body through a valve; the inlet side of the gas cooler is connected with the gas outlet end of the gas booster; the outlet side of the gas cooler is connected to a gas distribution row; the added cooling gas is discharged from the gas distribution unit and enters the grading cooling unit.
10. The on-line precise strengthening heat treatment device for the medium and small-caliber stainless steel corrugated pipes according to claim 9, characterized in that: the cooling gas is NH 3 Decomposing gas or nitrogen or hydrogen, and cooling at 0-25 deg.C.
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| CN115125370B (en) * | 2022-07-21 | 2023-06-09 | 燕山大学 | Local continuous induction heat supplementing device for large-scale inner corrugated cylinder section and working method thereof |
| CN115572811A (en) * | 2022-11-09 | 2023-01-06 | 常州九天新能源科技有限公司 | Ultra-thin welding strip annealing equipment for laminated tile assembly |
| CN117107034B (en) * | 2023-10-23 | 2023-12-22 | 江苏捷东机械设备有限公司 | Stainless steel plate surface heat treatment equipment |
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