EP2741861A1 - Dispositif de décapage cryogénique de surfaces non planes, en particulier de l'intérieur d'un tube - Google Patents
Dispositif de décapage cryogénique de surfaces non planes, en particulier de l'intérieur d'un tubeInfo
- Publication number
- EP2741861A1 EP2741861A1 EP12750439.7A EP12750439A EP2741861A1 EP 2741861 A1 EP2741861 A1 EP 2741861A1 EP 12750439 A EP12750439 A EP 12750439A EP 2741861 A1 EP2741861 A1 EP 2741861A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pipe
- pinion
- downstream
- fluid
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
- B05B13/0405—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with reciprocating or oscillating spray heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
- B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
- B05B13/0421—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation with rotating spray heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
- B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
- B05B13/0636—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies by means of rotatable spray heads or nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/14—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
- B05B15/60—Arrangements for mounting, supporting or holding spraying apparatus
- B05B15/65—Mounting arrangements for fluid connection of the spraying apparatus or its outlets to flow conduits
- B05B15/652—Mounting arrangements for fluid connection of the spraying apparatus or its outlets to flow conduits whereby the jet can be oriented
Definitions
- the invention relates to a jetting device for jets of cryogenic fluid, in particular high pressure liquid nitrogen, suitable for and designed to effectively strip the surface of a non-planar structure, in particular inside a tube. .
- a nozzle-holder tool with a rotary movement distributing one or more jets of liquid nitrogen at a pressure of 500 to 4000 bar and at a cryogenic temperature of between -100 and -200 ° C, typically between -140 and -160 ° C.
- the nozzle holder tool is attached to the end of a cryogenic fluid supply line which supplies the tool with cryogenic fluid, and a rotary movement about the axis of the pipe is conferred on the pipe and tool via a drive system with sprockets or belts driven by a motor.
- the dynamic sealing of the rotary system is usually provided by a cylindrical rotating cylinder seal, arranged around the pipe being traversed longitudinally by a bronze piece and surrounded for a solid piece of stainless steel.
- the problem to be solved is to propose a device for distributing cryogenic fluid, in particular liquid nitrogen, which makes it possible to clean and / or strip effectively the surface of a non-planar structure, in particular the interior of a tube or the like, for example the inner surface of a heat exchanger tube or used to perform a plastic extrusion.
- etching is used in its most general sense to mean a removal of material from the surface of a substrate, and thus also includes cleaning, peeling and other surface treatment operations including removing a material or material attached to the surface of a substrate.
- the solution of the invention is a stripping device comprising a fluid supply pipe, in particular a cryogenic fluid, such as liquid nitrogen, supplying one or more fluid distribution nozzles arranged at a free downstream end of said supply duct, and a drive motor cooperating with the fluid supply duct via a transmission mechanism, wherein the fluid supply duct comprises a fixed portion located upstream of the duct; an anchor point located on said supply pipe; and a downstream portion located downstream of the anchor point and comprising the free downstream end; and the transmission mechanism acts mechanically on the downstream portion of the pipe to obtain a determined movement of the downstream end carrying the nozzle or nozzles, characterized in that the transmission mechanism acts mechanically on the downstream portion of the pipe to give it a deformation angular torsion about its longitudinal axis.
- a fluid supply pipe in particular a cryogenic fluid, such as liquid nitrogen
- the device of the invention may comprise one or more of the following characteristics:
- the torsion occurs on the downstream part of the pipeline located between the anchor point and the place of said downstream part where the transmission mechanism acts.
- the angular deformation is a ⁇ -angle twist of the downstream pipe portion with ⁇ of between 1 and 120 °, more preferably between 30 and 90 °.
- the angular deformation is a ⁇ -angle twist of the downstream pipe portion where ⁇ is at least 5 °, preferably at least 10 °, more preferably at least 20 °.
- the angular deformation is a ⁇ -angle twist of the downstream pipe portion where ⁇ is at most 110 °, preferably at most 100 °, more preferably at most 95 °.
- At least a portion of the downstream portion of the pipe is of a material resistant to fatigue by angular torsion, that is to say a material chosen to not break despite the succession of angular torsions applied thereto.
- the material is chosen in such a way that the generated torsion does not induce, on the considered part, a stress greater than the fatigue rupture limit of the material.
- this stress will remain below the fatigue rupture limit of 316 stainless steel at the temperature of liquid nitrogen, ie about -155 ° C., or a limit of fatigue failure of about 533 N / mm 2 .
- Other other materials that can be used include titanium and nickel-based steels, which have properties similar to those of stainless steel. In all cases, the maximum stress experienced by the material must remain below 500 N / mm 2 .
- At least a portion of the downstream pipe portion is a material selected from stainless steel, nickel-based steel and titanium.
- the nozzle or nozzles each have an axis forming an angle ⁇ between 0 and 180 ° with the axis AA of said downstream channeling portion, preferably between an angle a of between 15 and
- it comprises from 2 to 30 nozzles, preferably from 2 to 10 nozzles.
- the transmission mechanism comprises a carrier pinion carried by the downstream portion of the pipe and a pinion drive device cooperating with said pinion-carrier.
- the gear drive device drives the carrier pinion, preferably in oscillation, so as to generate the deformation of the downstream portion of the pipe, preferably a torsion deformation ⁇ angle of the downstream portion of the pipe.
- the carrier pinion is rotatable about its central axis, the pipe being secured to the carrier pinion.
- said duct coaxially crosses said pinion-carrier.
- the gear drive device is driven by the drive motor.
- the pinion drive device is set in motion by the drive motor via a transmission shaft driven by the motor and acting on said pinion drive.
- the drive motor provides an oscillatory movement to the sprocket drive device via a transmission axis.
- the sprocket drive comprises a motor sprocket or a belt.
- the transmission axis is rotary or oscillating.
- a portion of the downstream pipe portion comprises turns or curves, in particular a form of pigtail, lyre or the like.
- the transmission mechanism is arranged in a transmission box, that is to say a housing, within which enters the transmission axis.
- Holding elements are provided to hold the carrier pinion, preferably the holding elements are arranged in the transmission box.
- the holding elements are skates, radial bearings or nipples.
- the main pipe is a stainless steel, nickel-base steel, titanium tube.
- the main pipe is a tube.
- the upstream end of the tube is removable via a connector so that it can be easily replaced, especially in case of wear.
- connection located downstream of the carrier pinion is adapted to receive an extension tube of given length so as to increase the length of the downstream portion carrying the end provided with nozzles.
- the invention also relates to a method for stripping the inner surface of a tube with a fluid, in which a device according to the invention is used to deliver one or more jets of cryogenic fluid at a pressure of at least 500 bar, advantageously at least 1000 bar, the cryogenic fluid being liquid nitrogen.
- the method of the invention may comprise one or more of the following technical characteristics: the cryogenic fluid, in particular liquid nitrogen, is dispensed by means of several nozzles in the form of jets of fluid at a temperature below -140 ° C. and at a pressure of at least 500 bar, advantageously between 2000 and 5000 bar, to achieve.
- the cryogenic fluid in particular liquid nitrogen
- the jets of fluid under pressure cause stripping of the surface of a material, in particular cleaning or stripping of the inner surface of a tube.
- the tube to be stripped is a tube of heat exchanger or extrusion of plastic material.
- the cryogenic fluid is at a temperature below -145 ° C., preferably between about -150 and -200 ° C.
- FIG. 1 is a schematic view of a first embodiment of a pickling device according to the present invention
- FIG. 2 is a diagrammatic (front) view of the carrier and motor gears of a device according to FIG. 1,
- FIG. 3 illustrates a device according to FIG. 1 inserted into a protective casing
- FIGS. 4 and 5 show a second embodiment of a pickling device according to the present invention.
- FIG. 6 shows the trajectory of the jets obtained with a pickling device according to the present invention.
- FIG. 1 illustrates the principle of an embodiment of a pickling device according to the present invention implementing jets of fluid at cryogenic temperature, such as liquid nitrogen, and at high pressure, that is to say say more than 500 bar.
- cryogenic temperature such as liquid nitrogen
- This device comprises a main pipe 7 for supplying fluid, such as a stainless steel tube, supplying one or more fluid distribution nozzles 6 arranged at the free downstream end 5 of said pipe 7.
- the nozzles 6 are carried by a nozzle holder tool 3 which is fixed to said downstream end 5 or formed in one piece therewith.
- the fluid to be dispensed is a fluid at cryogenic temperature and at high pressure, in particular liquid nitrogen at a pressure between 500 and 4000 bar and a temperature between -140 and -200 ° C.
- the fluid emanates from a source of fluid (not shown), such as a compressor, a tank, a heat exchanger, a feed line, a gas cylinder or the like, feeding the upstream end of the pipe 7 of fluid.
- a source of fluid such as a compressor, a tank, a heat exchanger, a feed line, a gas cylinder or the like, feeding the upstream end of the pipe 7 of fluid.
- the fluid supply line 7 of the cryogenic etching device cooperates with a drive motor 1 via a rotary transmission shaft 2 and a mechanism 8, 9, which will be detailed below.
- the pipe 7 of supply of fluid comprises, meanwhile, a fixed portion 7b upstream, that is to say, maintained so that it is not animated by any movement, and a downstream portion 7a and which it is not fixed, that is to say that it is driven by a movement which is conferred on it by the motor 1, via the transmission mechanism 2, 8, 9 as explained below.
- the downstream portion 7a carries the downstream end 5 of the pipe 7 where the fluid distribution nozzle or nozzles 6 are arranged, for example on a nozzle-carrying tool 3.
- the number of nozzles 6 implemented, for example from 2 to 12 nozzles, is related to the twist angle ⁇ of the downstream pipe 7a so that the entire surface of the substrate to be treated is swept by the jets of cryogenic liquid as shown schematically in Figure 6.
- the twist angle ⁇ of the downstream pipe 7a is preferably between 0 and 120 °, more preferably between 30 and 90 °.
- the fluid supply pipe 7 comprises an anchoring point 10 separating the fixed upstream portion 7b and the downstream portion 7a and movable which is situated downstream of the anchoring point 10.
- the transmission mechanism 2, 8, 9 acts in fact mechanically on the downstream portion 7a so as to give it a deformation, that is to say an angle twist ⁇ , and thus obtain a determined movement of the end downstream 5 carrying the nozzles 6, for example a reciprocating oscillating movement.
- the nozzles 6 each have an axis forming an angle ⁇ between 0 and 180 ° with the axis AA of the downstream pipe portion 7a, which makes it possible to obtain jets of liquid cryogenic, such as liquid nitrogen, distributed laterally, for example radially, and oriented outwardly of the pipe 7, so as to clean the inside of a tube, for example.
- liquid cryogenic such as liquid nitrogen
- Figure 6 illustrates how the fluid jets clean the inside of a tube. Since the nozzle-carrying tool 3 is oscillating about its axis, a jet emanating from a nozzle 6 is de facto also oscillated and sweeps an inside portion of the tube.
- the jet of liquid nitrogen delivered by each nozzle has an effect on a surface perpendicular to the axis of the cleaned tube.
- the two parameters to achieve this complete cleaning are the number of nozzles 6 and the twist angle ⁇ of the downstream pipe 7a.
- the transmission mechanism 2, 8, 9 comprises moving means acting mechanically on the downstream pipe portion 7a so as to give it a determined torsion movement, in particular an oscillatory torsion movement about its axis. longitudinal.
- the engine 1 cooperates with the upstream portion 7a of the fluid supply pipe 7 via its rotary transmission axis 2 and the transmission mechanism 8, 9 to which the transmission axis 2 transmits its movement.
- the transmission axis 2 transmits its movement. for example a rotary or oscillatory movement.
- the drive motor 1 is a pneumatic motor, electric, gasoline or any other type of engine.
- the transmission mechanism 2, 8, 9 comprises a carrier pinion 8 rotatable about an axis of rotation located in the center of said pinion. 8, and the downstream portion 7a of the cryogenic fluid supply line 7 is arranged centrally through said pinion-carrier 8.
- the axis of the channel portion 7a and the axis AA of the carrier pinion 8 are merged, as shown in Figure 2.
- the downstream portion 7a of the pipe 7 is thus arranged in a passage formed through the body of the carrier pinion 8, which passage is located within the disk that forms the pinion-carrier 8, in the center of said disk.
- a pinion drive device 9 such as a motor pinion or a belt, cooperates with the carrier pinion 8 so as to drive said pinion-carrier 8 in oscillation by exerting on it a mechanical torsion action. around its axis.
- the transmission shaft 2, driven by the motor 1 cooperates with the pinion drive means 9, and the pinion drive means 9 itself engages with said pinion-carrier 8 so as to transmit a given movement, for example oscillation, of the transmission axis 2 to the carrier pinion 8 and thus obtain an oscillatory torsion movement of the downstream pipe portion 7a carrying the fluid distribution nozzles 6 arranged at the downstream end 5 thereof, that is to say arranged on the tool 3 nozzle holder used to distribute the jet of fluid at high pressure.
- the device also comprises a gearbox 13 forming a protective casing, into which the transmission shaft 2 engages and which houses the transmission mechanism 8, 9.
- the gear 8 is held in place by a set of pads or by bearings of any type, for example with needles or balls, preferably balls (not detailed in Figure 3).
- the fluid supply pipe 7 cooperates with anchoring means 10, such as a flange, a slotted nut, an elastic cone, a rack and pinion system or any other suitable mechanical device for maintaining the fixed pipe 7 and in position relative to the rest of the jet distribution device.
- anchoring means 10 such as a flange, a slotted nut, an elastic cone, a rack and pinion system or any other suitable mechanical device for maintaining the fixed pipe 7 and in position relative to the rest of the jet distribution device.
- the anchoring means 10 are arranged on the pipe 7 upstream of the carrier pinion
- the pipe 7 is, on the one hand, kept fixed or approximately fixed at and because of the anchoring means 10, and, on the other hand, has a downstream end 5 provided with nozzles 6. which is mobile and describes a given movement, preferably oscillatory, when the motor 1 drives the transmission axis 2, the motor pinion 9 connected to the axis 2, and the pinion-carrier 8, which itself causes the tube 7 according to a determined trajectory, in particular of oscillatory torsion or the like.
- the torsion force applied to the pipe 7 by the transmission mechanism 8, 9 is distributed over the downstream portion 7a between the anchoring point 10 and the pinion-carrier 8.
- the anchor point 10 is a mechanical element for blocking / preventing or unblocking / allowing the slippage of the pipe 7 through the device.
- the mechanical element of the anchoring point 10 can be loosened easily by the user, for example by using a suitable tool, so as to adjust or adjust the distance of the portion 7a between including the door tool 5 and the carrier pinion 8.
- the connector 14 connects the upstream portion 7b to the cryogenic fluid supply line. This connection allows easy disassembly and change if necessary, the tube cleaning system.
- the pipe 7 is divided into two parts connected by a connector 11, preferably a very high pressure static coupling 11, positioned upstream of the anchoring point 10, as shown in FIGS. 1, 3 and 4. This makes it easy to replace the part of the tube 7 located between this static connection 11 and the nozzle-holder tool 5, by an extension tube 12 of suitable length without having to move or modify the assembly of the tube 7.
- the nature of the material constituting the tube 7 and its dimensioning, i.e. inside and outside diameters of said tube 7, are important.
- a stainless steel tube is preferentially used as pipe 7, and of internal and external diameters as given in the table below.
- a pickling device is as follows when it comes to pickling the inner surface of a tube, for example a heat exchanger tube, with liquid nitrogen at a pressure of more than 500 bar.
- the free downstream end 5 of the liquid nitrogen supply line 7 comprising the distribution nozzles 6 of the pickling device of the invention is introduced into the tube to be stripped.
- downstream portion 7a of the tube 7 is twisted at an angle ⁇ about its longitudinal axis in order to sweep through the jets of liquid nitrogen delivered by the nozzles 6, an area or area sufficient to perform an effective cleaning of the internal surface of the considered substrate, that is to say the inner wall of the tube, as shown in Figure 6.
- the free downstream end 5 carrying the nozzles 6 describes, under the effect of the torsion it undergoes, a semi-circular lateral sweep of the inside of the tube to be stripped, since the portion 7a downstream is animated by an oscillation movement, that is to say oscillating back and forth, and that the nozzles 6 are oriented so as to form an angle of about 45 ° in this case with the axis of the downstream portion 7a of the pipe 7.
- the torsion angle ⁇ can be 45 ° without risk of fatigue damage to Line 7.
- this tube undergoes a maximum stress of about 486 N / mm 2 which remains below the fatigue rupture limit of a 316 stainless steel at the temperature of liquid nitrogen, ie about -155 ° C.
- This fatigue failure limit for 316 stainless steel at the temperature of the liquid nitrogen under consideration is about 533 N / mm 2 .
- torsion angle ⁇ equal to 45 °, it is sufficient to have less than 1 m of tube disposed pigtail for example.
- the pickling device of the invention has been described in relation to a cryogenic fluid distribution, namely liquid nitrogen supplying fluid distribution nozzles. This is a particularly preferred embodiment of the invention. However, the pickling device of the invention could also be used to dispense other fluids, such as a non-liquefied gas, in particular ambient air or nitrogen, or even treated or untreated liquid water.
Landscapes
- Cleaning By Liquid Or Steam (AREA)
- Cleaning In General (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1157316A FR2978925B1 (fr) | 2011-08-12 | 2011-08-12 | Dispositif de decapage cryogenique de surfaces non planes, en particulier de l'interieur d'un tube |
| PCT/FR2012/051732 WO2013024221A1 (fr) | 2011-08-12 | 2012-07-20 | Dispositif de décapage cryogénique de surfaces non planes, en particulier de l'intérieur d'un tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2741861A1 true EP2741861A1 (fr) | 2014-06-18 |
| EP2741861B1 EP2741861B1 (fr) | 2015-09-16 |
Family
ID=46724504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12750439.7A Not-in-force EP2741861B1 (fr) | 2011-08-12 | 2012-07-20 | Dispositif de décapage cryogénique de surfaces non planes, en particulier de l'intérieur d'un tube |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2741861B1 (fr) |
| FR (1) | FR2978925B1 (fr) |
| WO (1) | WO2013024221A1 (fr) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3002863A1 (fr) | 2013-03-07 | 2014-09-12 | Air Liquide | Dispositif de distribution de jets de fluide cryogenique avec enveloppe souple de protection |
| CN105665202A (zh) * | 2016-01-05 | 2016-06-15 | 杨明华 | 使用输气系统排热且喷涂速度可调的板材喷涂工艺的执行方法 |
| CN108772231A (zh) * | 2018-08-22 | 2018-11-09 | 南通理工学院 | 一种半封闭空间辅助喷涂机器人 |
| CN114472388B (zh) * | 2022-02-15 | 2022-11-25 | 江西晶昊盐化有限公司 | 一种防止管线干湿交界处结疤堵塞的清理系统及清理方法 |
| CN114753787A (zh) * | 2022-05-06 | 2022-07-15 | 咸宁职业技术学院 | 一种用于施工的锚杆孔清孔装置 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7316363B2 (en) * | 2004-09-03 | 2008-01-08 | Nitrocision Llc | System and method for delivering cryogenic fluid |
| US7310955B2 (en) | 2004-09-03 | 2007-12-25 | Nitrocision Llc | System and method for delivering cryogenic fluid |
| FR2948301B1 (fr) * | 2009-07-21 | 2013-01-11 | Air Liquide | Dispositif de distribution de jets de fluide sans joint tournant |
-
2011
- 2011-08-12 FR FR1157316A patent/FR2978925B1/fr not_active Expired - Fee Related
-
2012
- 2012-07-20 WO PCT/FR2012/051732 patent/WO2013024221A1/fr not_active Ceased
- 2012-07-20 EP EP12750439.7A patent/EP2741861B1/fr not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013024221A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2741861B1 (fr) | 2015-09-16 |
| FR2978925A1 (fr) | 2013-02-15 |
| WO2013024221A1 (fr) | 2013-02-21 |
| FR2978925B1 (fr) | 2013-09-27 |
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