CN101264591A - Spray gun for steel tube inner-wall reinforced peening - Google Patents

Spray gun for steel tube inner-wall reinforced peening Download PDF

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Publication number
CN101264591A
CN101264591A CNA200810032962XA CN200810032962A CN101264591A CN 101264591 A CN101264591 A CN 101264591A CN A200810032962X A CNA200810032962X A CN A200810032962XA CN 200810032962 A CN200810032962 A CN 200810032962A CN 101264591 A CN101264591 A CN 101264591A
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CN
China
Prior art keywords
nozzle
steel tube
outer tube
spray gun
wall
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Pending
Application number
CNA200810032962XA
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Chinese (zh)
Inventor
陶贵钧
马耀根
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SHANGHAI XINYAXIN TECHNOLOGY Co Ltd
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SHANGHAI XINYAXIN TECHNOLOGY Co Ltd
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Application filed by SHANGHAI XINYAXIN TECHNOLOGY Co Ltd filed Critical SHANGHAI XINYAXIN TECHNOLOGY Co Ltd
Priority to CNA200810032962XA priority Critical patent/CN101264591A/en
Publication of CN101264591A publication Critical patent/CN101264591A/en
Pending legal-status Critical Current

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Abstract

The invention relates to an ejection gun for intensifying the inner wall of a steel tube by ball blast, in particular to an ejection gun for intensifying the inner wall of an austenitic stainless steel tube to improve the property of the high temperature vapor oxidation resistance and the corrosive resistance. The ejection gun comprises a nozzle and a nozzle stem, the nozzle is assembled at the front end of the nozzle stem, the nozzle comprises an outer tube and a guiding core, the front end of the guiding core is provided with a relative big head, an annular gap for injecting the mixed flow of the ball and gas is positioned between the nozzle guiding core and the front opening of the outer tube, when ball blasting, the gas source energy and the steel balls are accumulated at the narrow annular gap and injected out around the circumferential direction of the steel tube inner wall, making a hardening layer resistant to the high-temperature oxidation corrosion and distributed around the inner wall of the steel tube. The nozzle stem is a linear austenitic stainless steel tube, the unplasticity in the lengthwise direction ensures that the speed of the blasting ball is kept in the whole steel tube, and the hardening layer is generated and distributed evenly on the steel tube inner wall; a flexible design of a big length-diameter ratio is adopted on the nozzle stem shape so as to help the nozzle to automatically center to the steel tube inner wall.

Description

Spray gun for steel tube inner-wall reinforced peening
Technical field
The present invention relates to a kind of spray gun for steel tube inner-wall reinforced peening, refer to especially be used to strengthen austenite stainless heat-resisting seamless steel pipe internal wall to improve the spray gun for steel tube inner-wall reinforced peening of its high temperature resistance steam oxidation corrosive nature.
Background technology
China's thermoelectricity generating has entered overcritical and development epoch ultra supercritical pressure, the steam exit pressure of station boiler has reached 28MPa, steam exit temperature is up to 605 ℃, under so high parameter, boiler heating surface piping high temperature section uses the inwall of austenite stainless heat-resistance steel pipe such as TP304H, TP321H, the TP347H of 18Cr-8Ni type to be faced with the threat of high-temperature steam oxide etch usually.
In order to prevent the corrosion of 18Cr-8Ni austenite stainless heat-resistance steel pipe inwall high temperature resistance steam oxidation, current, " austenite stainless heat-resistance seamless shot blasting steel pipe " of inventor's invention makes overcritical and the design of ultra-supercritical boiler heating surface piping selects for use 18Cr-8Ni austenite stainless heat-resistance " shot blasting steel pipe " to become possibility, this " shot blasting steel pipe " is to implement stress peening process at the steel pipe inwall, make its inwall top layer obtain tissue and stress reinforced, in order to improve the performance of 18Cr-8Ni austenite stainless heat-resistance steel pipe high temperature resistance steam oxidation.
Add man-hour when adopting shot that the steel pipe inwall is carried out shot peening strengthening, the spray gun of shot directive steel pipe inwall is one of shot peening strengthening processing key technology, and there is following defective in the spray gun that is used for shot-peening processing now:
1. because nozzle od is bigger, be subjected to the restriction of miniaturization design, the pipe diameter of its shot peening strengthening processing is not less than 50mm, is unsuitable for the inner-wall reinforced processing of small-caliber steel pipe;
2. the nozzle in the spray gun is a diffusing structure, can not assemble enough source of the gas energy shooting steel pipe inwalls, to form the hardened layer of high temperature resistance steam oxidation corrosion;
3. the spray boom in the spray gun is a flexible pipe, can not guarantee 360 ° of even scatterings of nozzle centering, can not guarantee that nozzle at the uniform velocity advances along its length, thereby can not form along steel pipe circumferentially and the hardened layer that is evenly distributed of length direction;
4. as will realize that automation technolo need dispose complicated nozzle centering rotating mechanism, and length is only limited to 2M, not only improved cost height, and be difficult to overcome limitation on the shot-peening length.
Summary of the invention
The purpose of this invention is to provide the necessary spray gun of a kind of austenite stainless heat-resistance steel pipe internal wall strengthening shot-blasting production line, being intended to by shot is carrier with the high-pressure air source, can assemble the strong energy that sprays by this spray gun and strengthen the steel pipe inwall, to form the hardened layer that circumferentially reaches the high temperature resistance steam oxidation corrosion that length direction is evenly distributed along steel pipe.
For achieving the above object, steel pipe internal wall strengthening of the present invention has a nozzle and a spray boom with spray gun, this nozzle sets is contained in the spray boom front end, this nozzle has an outer tube and a water conservancy diversion core, the front end of this water conservancy diversion core has a bigger head end, is formed with an annular slot for the ejection of ball gas mixed flow between nozzle water conservancy diversion core and outer tube front opening.
Described this spray boom is length L≤15M, and draw ratio is greater than 600 linearity Austenitic stainless steel pipe.
The material of described nozzle is through heat treated alloy tool steel.
Described nozzle od size is suitable for processing the steel pipe that sprayed that internal diameter is 24mm≤ID≤60mm.
The front end of described outer tube forms a trumpet-shaped opening, forms the relief cambered surface of an annular in this around openings.
Described this water conservancy diversion core slightly is the loudspeaker moulding, and its front end is a bigger head end, and the rear end is provided with an end of thread, and the periphery wall between this water conservancy diversion core print end and the end of thread then forms a cancave cambered surface, and this cancave cambered surface is one slightly to be parabolic cambered surface.
Described this outer tube inboard is connected with center assembling bar with fin, the front end of this center assembling bar is formed with a screw, this water conservancy diversion core rear end is provided with an end of thread that matches with outer tube center assembling bar front end screw, and this water conservancy diversion core is assembled in the screw place of outer tube center assembling bar front end with the end of thread of its rear end; The rear perpheral of this outer tube is formed with external thread section, is formed with the internal thread segment that matches with nozzle outer tube back-end external thread section at the front end of this spray boom, and this nozzle is assembled in the internal thread segment place of spray boom front end with the external thread section of its outer tube back-end.
One ball gas passage is arranged in described this spray boom; Nozzle is assembled the ball gas speedup passage that becomes a ring-type between bar and the water conservancy diversion core in the outer tube inboard with the center, and the internal diameter of this nozzle outer tube is less than the internal diameter of the inboard ball gas of spray boom passage.
Steel pipe internal wall strengthening shot-blasting of the present invention is strengthened can reach following technique effect with spray gun:
1. nozzle adopts the miniaturization design, the pipe diameter ID 〉=24mm of its shot peening strengthening processing, and single rifle shot-peening amount maximum can reach 20kg/min, is suitable for strengthening the small-caliber steel pipe inwall of all specifications of station boiler heating surface piping;
2. what nozzle adopted is to gather to penetrate structure, and during shot-peening, the source of the gas energy accumulating is in 360 ° of narrow annular sections, and energy consumption is low and can shoot the hardened layer that the steel pipe inwall forms the corrosion of high temperature resistance steam oxidation;
3. spray boom is the linearity steel pipe, and it can not only guarantee the evenly shooting of 360 ° of nozzle centerings, can also guarantee nozzle along its length average rate advance, thereby can form hardened layer circumferential along steel pipe and that length direction is evenly distributed;
4. spray boom adopts draw ratio greater than 600 flexibility design, during shot-peening, nozzle and steel pipe automatic centering, but nozzle with compressed air shotblasting machine along the steel pipe length direction at the uniform velocity during mobile shot-peening, spray boom then is a rigid rod, can circumferentially reach at the steel pipe inwall thus and can both form uniform peening layer on the length direction, not realize automation technolo and do not need to establish in addition complex mechanism;
5. in the spray gun, spray bar length can reach 15M, and the energy shot-peening grows to the steel pipe inwall of 12M;
6. nozzle material is general alloy tool steel, and it is simple in structure, and is easy to process, after suitable heat treatment, not only anti-ly wash away, wear-resistant, and the cost performance height.
Description of drawings
Fig. 1 is the structural representation of spray gun for steel tube inner-wall reinforced peening of the present invention.
The specific embodiment
Please refer to Fig. 1, spray gun for steel tube inner-wall reinforced peening of the present invention has a nozzle 10 and a spray boom 20, and an end of this spray boom 20 is connected with nozzle 10, and the other end can be connected with the ball valve flange that goes out of portable compressed air shotblasting machine.This nozzle 10 has an outer tube 11 and a water conservancy diversion core 15.
These outer tube 11 inboards are connected with center assembling bar 13 with fin 12, the front end of this outer tube 11 forms a trumpet-shaped opening, form the relief cambered surface 110 of an annular in this around openings, the rear perpheral of this outer tube 11 is formed with external thread section 112, the rear inside of this outer tube 11 forms a tapered opening 113, the center assembling bar 13 of these outer tube 11 inboards is supported on the central axis position of outer tube 11 by fin 12, this fin 12 is three and is and is equiangularly arranged in outer tube 11 inboards in the embodiment shown in Fig. 1, the front end of center assembling bar 13 is formed with a screw 130, and the rear end forms an awl end 132;
This water conservancy diversion core 15 slightly is the loudspeaker moulding, its front end is a bigger head end 150, the rear end is provided with an end of thread 152 that matches with outer tube 11 centers assembling bar 13 front end screws 130, and this water conservancy diversion core 15 can be assembled to screw 130 places of outer tube 11 centers assembling bar 13 front ends with the end of thread 152 of its rear end, periphery wall between water conservancy diversion core 15 head ends 150 and the end of thread 152 then forms a cancave cambered surface 154, and this cancave cambered surface 154 can be one slightly to be parabolic cambered surface.
This spray boom 20 is Austenitic stainless steel pipes of linearity, its steel pipe length employing draw ratio designs greater than 600 flexibility, spray boom 20 with length L=15M is an example, the selectable specification of its steel pipe (external diameter * wall thickness) has two kinds: φ 25mm * 3mm, φ 22mm * 3mm, its external diameter are suitable for the steel pipe inwall of shot peening strengthening inner diameter, ID 〉=24mm.Front end at this spray boom 20 is formed with the internal thread segment 202 that matches with nozzle 10 outer tubes 11 rear end external thread sections 112.
Aforementioned nozzle 10 is installed in front end internal thread segment 202 places of this spray boom 20 with outer tube 11 rear end external thread sections 112, and these nozzle 10 materials can be general alloy tool steels, through after the suitable heat treatment, its hardness height, approximate 62HRc, possess anti-washing away, the wear-resistant and high characteristics of cost performance.
When finishing, spray gun for steel tube inner-wall reinforced peening assembling of the present invention as shown in fig. 1, a ball gas passage 201 is arranged in spray boom 20; Nozzle 10 is assembled the ball gas speedup passage 14 that becomes a ring-type between bar 13 and the water conservancy diversion core 15 in outer tube 11 inboards with the center, adding man-hour, the ball gas mixed flow that is mixed by pressure-air and shot enters in the ball gas speedup passage 14 of nozzle 10 after by the guiding of the ball gas passages 201 in the spray boom 20 via nozzle 10 outer tube back-end tapered openings 113 and center assembling bar 13, and then turn to via the trumpet-shaped opening guiding of nozzle 10 water conservancy diversion cores 15 and outer tube 11 front ends,, process by the ejection of the annular slot between nozzle 10 water conservancy diversion cores 15 and the trumpet-shaped opening of outer tube 11 front ends with approaching direction radially and can carry out shot-peening to the steel pipe (not shown) inwall to be processed that is set in nozzle 10 outsides.
By among Fig. 1 as can be seen the internal diameter of nozzle that spray gun for steel tube inner-wall reinforced peening of the present invention adopts 10 outer tubes 11 less than the internal diameter of spray boom 20 inboard ball gas passages 201, in nozzle 10, be provided with simultaneously center assembling bar 13, so when ball gas mixed flow is entered in the less nozzle of the sectional area 10 ball gas speedup passages 14 by spray boom 20 ball gas passages 201, can obtain the effectiveness of a speedup, make shot have bigger energy, and can shot from the front end of nozzle 10 be 360 ° comprehensive when the steel pipe inwall penetrates, can reach splendid drawing hardening effect.
In addition, when ball gas mixed flow sprays at the annular slot between nozzle 10 water conservancy diversion cores 15 and the trumpet-shaped opening of outer tube 11 front ends, because the flexibility design that pressure effect collocation spray boom 20 draw ratios own are big, make nozzle 10 can among processed steel pipe, align the center automatically, thereby obtain the uniform processing hardening effect along the steel pipe inner circumferential wall.But the flexibility of spray boom 20 design is along the automatic centering of pipe diameter energy at nozzle 10, when nozzle 10 with compressed air shotblasting machine when the steel pipe length direction moves the shot blasting steel pipe inwall, 20 of spray booms are rigid rods, thereby, not only can avoid Lou spray phenomenon in the steel pipe length direction, and can form uniform peening layer at inwall.
Scope of the present invention by claims but not aforementioned specification limit, equally, the specific embodiment wherein is schematic but not determinate, therefore, all can be contained in the claim of the present invention in the implication and all changes in the scope of the equivalent of claims.Under the situation that does not deviate from its spirit and substantive characteristics, can other ad hoc fashion implement the present invention, and these ad hoc fashions belong to scope of the present invention equally.

Claims (10)

1. spray gun for steel tube inner-wall reinforced peening, it is characterized in that: this spray gun has a nozzle and a spray boom, this nozzle sets is contained in the spray boom front end, this nozzle has an outer tube and a water conservancy diversion core, the front end of this water conservancy diversion core has a bigger head end, is formed with an annular slot for the ejection of ball gas mixed flow between nozzle water conservancy diversion core and outer tube front opening.
2. spray gun for steel tube inner-wall reinforced peening as claimed in claim 1 is characterized in that: described this spray boom is the Austenitic stainless steel pipe of linearity.
3. spray gun for steel tube inner-wall reinforced peening as claimed in claim 1 or 2 is characterized in that: the draw ratio of described this spray boom is greater than 600.
4. spray gun for steel tube inner-wall reinforced peening as claimed in claim 3 is characterized in that: described spray bar length L≤15M.
5. spray gun for steel tube inner-wall reinforced peening as claimed in claim 1 is characterized in that: the material of described nozzle is through heat treated alloy tool steel.
6. spray gun for steel tube inner-wall reinforced peening as claimed in claim 5 is characterized in that: described nozzle od size is suitable for processing the steel pipe that sprayed that internal diameter is 24mm≤ID≤60mm.
7. spray gun for steel tube inner-wall reinforced peening as claimed in claim 1 is characterized in that: the front end of described outer tube forms a trumpet-shaped opening, forms the relief cambered surface of an annular in this around openings.
8. spray gun for steel tube inner-wall reinforced peening as claimed in claim 7, it is characterized in that: described this water conservancy diversion core slightly is the loudspeaker moulding, its front end is a bigger head end, the rear end is provided with an end of thread, periphery wall between this water conservancy diversion core print end and the end of thread then forms a cancave cambered surface, and this cancave cambered surface is one slightly to be parabolic cambered surface.
9. spray gun for steel tube inner-wall reinforced peening as claimed in claim 8, it is characterized in that: described this outer tube inboard is connected with center assembling bar with fin, the front end of this center assembling bar is formed with a screw, this water conservancy diversion core rear end is provided with an end of thread that matches with outer tube center assembling bar front end screw, and this water conservancy diversion core is assembled in the screw place of outer tube center assembling bar front end with the end of thread of its rear end; The rear perpheral of this outer tube is formed with external thread section, is formed with the internal thread segment that matches with nozzle outer tube back-end external thread section at the front end of this spray boom, and this nozzle is assembled in the internal thread segment place of spray boom front end with the external thread section of its outer tube back-end.
10. spray gun for steel tube inner-wall reinforced peening as claimed in claim 9 is characterized in that: a ball gas passage is arranged in described this spray boom; Nozzle is assembled the ball gas speedup passage that becomes a ring-type between bar and the water conservancy diversion core in the outer tube inboard with the center, and the internal diameter of this nozzle outer tube is less than the internal diameter of the inboard ball gas of spray boom passage.
CNA200810032962XA 2008-01-23 2008-01-23 Spray gun for steel tube inner-wall reinforced peening Pending CN101264591A (en)

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Application Number Priority Date Filing Date Title
CNA200810032962XA CN101264591A (en) 2008-01-23 2008-01-23 Spray gun for steel tube inner-wall reinforced peening

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Application Number Priority Date Filing Date Title
CNA200810032962XA CN101264591A (en) 2008-01-23 2008-01-23 Spray gun for steel tube inner-wall reinforced peening

Publications (1)

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CN101264591A true CN101264591A (en) 2008-09-17

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102601743A (en) * 2012-04-10 2012-07-25 中国海洋石油总公司 Special spray nozzle for pipe external welding seam circulating sand-blasting rust removal device
CN102975127A (en) * 2012-11-21 2013-03-20 中国航空工业集团公司北京航空材料研究院 Split type inner cavity shot-blasting spray gun
CN104816253A (en) * 2015-05-28 2015-08-05 重庆钢铁(集团)有限责任公司 Quality defect treating device for inner wall of steel pipe
CN107756265A (en) * 2017-09-28 2018-03-06 中国航发动力股份有限公司 A kind of split type shot-peening bounce-back spray gun
CN111775063A (en) * 2020-06-09 2020-10-16 葛元安 Shot blasting treatment equipment

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102601743A (en) * 2012-04-10 2012-07-25 中国海洋石油总公司 Special spray nozzle for pipe external welding seam circulating sand-blasting rust removal device
CN102975127A (en) * 2012-11-21 2013-03-20 中国航空工业集团公司北京航空材料研究院 Split type inner cavity shot-blasting spray gun
CN102975127B (en) * 2012-11-21 2016-01-06 中国航空工业集团公司北京航空材料研究院 A kind of Split type inner cavity shot-peening spray gun
CN104816253A (en) * 2015-05-28 2015-08-05 重庆钢铁(集团)有限责任公司 Quality defect treating device for inner wall of steel pipe
CN107756265A (en) * 2017-09-28 2018-03-06 中国航发动力股份有限公司 A kind of split type shot-peening bounce-back spray gun
CN111775063A (en) * 2020-06-09 2020-10-16 葛元安 Shot blasting treatment equipment

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Open date: 20080917