EP0028088B1 - Procédé, appareil et buse de pulvérisation pour revêtir la surface intérieure de tubes longs et de petit diamètre - Google Patents

Procédé, appareil et buse de pulvérisation pour revêtir la surface intérieure de tubes longs et de petit diamètre Download PDF

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Publication number
EP0028088B1
EP0028088B1 EP19800303602 EP80303602A EP0028088B1 EP 0028088 B1 EP0028088 B1 EP 0028088B1 EP 19800303602 EP19800303602 EP 19800303602 EP 80303602 A EP80303602 A EP 80303602A EP 0028088 B1 EP0028088 B1 EP 0028088B1
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EP
European Patent Office
Prior art keywords
nozzle
tube
paint
coating
liquid coating
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.)
Expired
Application number
EP19800303602
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German (de)
English (en)
Other versions
EP0028088A1 (fr
Inventor
Koji C/O Sumitomo Light Metal Ind.Ltd Nagata
Akio C/O Sumitomo Light Metal Ind.Ltd Ogiso
Kyuji C/O Sumitomo Light Metal Ind.Ltd Sudo
Mamoru C/O Sumitomo Light Metal Nishikawa
Shiro C/O Sumitomo Light Metal Ind.Ltd Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Light Metal Industries Ltd
Original Assignee
Sumitomo Light Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP1979147890U external-priority patent/JPS6110775Y2/ja
Priority claimed from JP6368180A external-priority patent/JPS56161870A/ja
Application filed by Sumitomo Light Metal Industries Ltd filed Critical Sumitomo Light Metal Industries Ltd
Publication of EP0028088A1 publication Critical patent/EP0028088A1/fr
Application granted granted Critical
Publication of EP0028088B1 publication Critical patent/EP0028088B1/fr
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/10—Spray pistols; Apparatus for discharge producing a swirling discharge
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/1606—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air
    • B05B7/1613—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed
    • B05B7/1633—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed and heat being transferred from the material to be sprayed to the atomising fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/1606—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air
    • B05B7/1613—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed
    • B05B7/1646—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed the material to be sprayed and the atomising fluid being heated by the same source of heat, without transfer of heat between atomising fluid and material to be sprayed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/1606—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air
    • B05B7/1613—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed
    • B05B7/1646—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed the material to be sprayed and the atomising fluid being heated by the same source of heat, without transfer of heat between atomising fluid and material to be sprayed
    • B05B7/1653—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed the material to be sprayed and the atomising fluid being heated by the same source of heat, without transfer of heat between atomising fluid and material to be sprayed the source of heat being a heat conductive fluid

Definitions

  • This invention relates to a method, apparatus and spray nozzle for coating the inner surface of long tubes of small diameter, and more particularly to a method applicable to protective coating of a heat exchanger tube or condenser tube employed in a condenser of a steam turbine, used for a power plant, being especially effective in performing the coating where the tube is in an installed condition in the plant, and to an apparatus therefor.
  • condensers In power plants condensers have been traditionally used for cooling the exhaust gas (steam) of a stream-turbine to condense it and recycle the condensed water.
  • a condenser of such use thousands of or sometimes tens of thousands of long tubes of copper alloy, for example 5-40 m in length, having a small inner diameter on the order of 10-40 mm are incorporated as condenser tubes.
  • Those tubes, which pass the cooling water such as sea water therethrough, are adapted to cool the exhaust steam passing thereoutside.
  • Those condenser tubes which constantly pass the cooling liquid such as sea water containing corrosive substances richly at a fairly high flow speed, for example 1-2.5 m/sec., are susceptible to various types of corrosion or erosion corrosion. It is therefor necessary to cover or coat the whole inner (internal) surface of those tubes with a protective synthetic resin coating or paint for the purpose of corrosion-and-rust prevention. But the coating in this case is required to avoid degradation of the heat transfer therefrom, which is the essential condition of the condenser tube, by all means.
  • a thin (on the order of 10-30 ⁇ ) and uniform coating film which will not deteriorate the heat transferring or exchanging capability is needed for the protective coating of a heat transfer tube such as a heat exchanger tube in a heat changer like a condenser.
  • tubes having a thin coating film in the interior thereof it is sometimes necessary to repaint or recoat, before the life of the whole plant for example 20 or 30 years comes to an end, because the thin coated film (a) may be worn away after the tubes being installed in the plant to expose the base metal by a mere aging, (b) may be eroded by shells or sand particles contained in the sea water, or (c) may be worn acceleratively by the so-called sponge ball cleaning method taken to remove foreign matters stuck to the tube such as seaweeds.
  • the interior coating of resin paint film of the tubes are sometimes shorter in life than the plant itself, and it must be periodically or occasionally repainted (recoated) particularly in an installed state in the plant.
  • paint nebulized or atomized by a spray gun is coated on the inner surface of a tube, and sometimes even a long neck spray gun with a length of 500 mm or so is inserted in the tube, but it is not free from a problem that the length of the tube to be effectively coatable by this spray gun is naturally restricted to some extent.
  • Still another method as a variation of the above for avoiding the problem, seems to be available, wherein a moving nozzle which is shiftable from one end of a tube to the other end while spraying the paint is employed.
  • a spray gun is provided with an elongated barrel formed of concentric rigid tubes.
  • the total length of the barrel is formed by screwing a plurality of barrel sections into one another.
  • a rigid control rod extends longitudinally up the centre of the innermost barrel table and terminates in a valve portion having a conical tip. This tip mates with the end of a passage in tubular stem of spray head.
  • the stem is located within a cylindrical nozzle cap and is provided with a spiral groove on its outer surface.
  • Flow of fluid from the spray gun is controlled in use by moving the control rod backwards and forwards and the spiral groove on the surface of stem imparts a whirling motion to the spray.
  • the thickness (t) of a coated film is regulated by an undermentioned formula, wherein,
  • the thickness (t) of the film is given as a function of the discharge amount (q) of the paint, solid ratio (a), i.e. of the solidified portion (component to be remained), of the paint, and the shifting rate (v) of the spray nozzle.
  • the ratio of the solidified portion of the paint is determined by the mixing ratio of the synthetic resin, pigment, and solvent. Coating is however practiced generally, irrespective of the environmental temperature, at a most suitable paint viscosity for spraying.
  • the viscosity of a film forming substance such as synthetic resin depends, on the other hand, upon the temperature, so it is necessary to vary the mixing ratio of the solvent in the paint according to the environmental temperature under which the coating is carried out so as to keep a constant viscosity of the paint to be coated. In other words, the value in the general formula mentioned above is varied to consequently change the thickness (t) of the film.
  • Hot spray coating was proposed, on the other hand, to eliminate those disadvantages.
  • French Specification FR-E-88147 describes an arrangement for heating the compressed air feed to a spray gun (although there is no suggestion of using the spray gun to coat the internal surfaces of tubes) in which a compressed air supply is divided and fed via flexible tubes to accumulators having electrically heated collars. Heated air is taken from the accumulators via lines and combined in flexible tube, which is provided in its interior with flexible elongated heating elements.
  • the air spray coating method in the interior coating of a tube is usually limited to a case wherein the internal diameter of the tube is relatively large, the length of the tube is within 5 meters or so, and the thickness of the coated film is allowed as large as 50-200 u. It is therefore employable only for the anti-corrosion coating of a tube or pipe used in flowing an ordinary fluid.
  • a nozzle portion In a spray gun which has been used in the air spray coating, a nozzle portion is said susceptible to sticking of paint and dust in either the paint passage or air passage. Such sticking of paint and dust to the passages is liable to deteriorate the spraying (atomizing) condition due to the clogging thereof. It makes the spraying unstable, which naturally hampers a continuous and uniform coating to be executed smoothly. Besides, the clogging of the essential portions of the nozzle requires a breaking up for cleaning thereof, giving rise to another problem of increasing the man power to be consumed.
  • the present invention was made from such a background. It is therefore a primary object of this invention to provide an effective and practical method of coating the inner or internal surface of a long tube of small diameter and an apparatus therefor.
  • a method for coating the inner surface of a long tube of small diameter from one end opening of the long tube to the other end opening thereof comprises:
  • the invention also provides a coating apparatus for coating the inner surface of a long tube of small diameter by spraying a liquid coating medium in a manner producing atomization while being shifted from one end opening to the other end opening thereof, comprising:
  • a nozzle for apparatus for continuously and gradually coating the inner surface of a tube by spraying, while being shifted inside along the axial direction of said tube comprising:
  • This invention has enabled the formation of a thin and uniform thick film on the inner surface of a long tube of small diameter, without producing any unevenness and other defects in the coated film.
  • the supplying hose is drawn back at a predetermined speed or rate toward the firstly inserted opening end, while performing the paint spraying from the nozzle.
  • the paint and the air are respectively delivered from a paint reservoir and a compressed air tank of air-transformer type located outside the long tube through the supplying hose longer than the long tube to be coated; and the paint and the air are respectively heated to a predetermined temperature in the course of being delivered to the nozzle for being sprayed therefrom. It enables the paint to be sprayed under the predetermined atomization condition constantly, eliminating the necessity of varying the solvent ratio for adjusting the viscosity of the paint.
  • the atomizing gas is imparted a straight going force and a spiral going force, owing to the axially elongated grooves, between the prism portion and the inside surface of the nozzle cap, and the spiral groove.
  • the paint can be, due to the double directional atomizing gas, spirally sprayed with a uniform thickness in the circumferential and axial directionn of the tube-to-be-coated throughout the entire length thereof.
  • This nozzle has eliminated the frequent overhauling of the spray nozzle which was conventionally inevitable due to the clogging of paint remnant and dust in the air pocket and other portions of the nozzle.
  • This nozzle has enabled in this way a stable and continuous spraying operation for a long tube of small diameter, bringing about a good result of thin and uniform thickness of film in all direction of the tube interior.
  • this invention is quite effective.
  • This nozzle is capable of giving a coating film at a thickness of 10-30,a to a condenser tube of the above-mentioned dimension, without deteriorating the heat transfer function of the tube at all, the most important feature as a heat exchanger.
  • FIG. 1 A surface condenser 10 employed in a thermal power plant (station), being connected with a steam-turbine, is shown in Fig. 1, wherein a large cylindrical fluid-tight, sealable condenser shell 1 is divided into three chambers with a pair of condenser tube plates 2 and 3 disposed at either endwise biased portion. In the central portion sandwiched by the pair of plates 2, 3 thousands of or tens of thousands of condenser tubes 4 of copper alloy with the diameter of 10-40 mm ⁇ are parallelly disposed extending along the length of 5-40 m. On either end portion of the condenser shell 1 outside the tube plates 2, 3 condenser water boxes 6 and 7 is respectively formed.
  • a steam inlet 11 is disposed centrally located for receiving the exhaust steam from the steam turbine; on the lower side of the shell 1 a condensed water recovering (receiving) inlet 12 is made, similarly centrally located in the alteral direction, as can be seen in Fig. 1.
  • a cooling water outlet 16 is provided on top of the shell 1; in the right side of the water box 7 a cooling water inlet 17 is provided on the lower side of the shell 1.
  • a vent 13 is formed on one flank of the shell 1.
  • the cooling water inlet 17 and the cooling water outlet 16 are respectively connected to a circulating water pump; the condensed water receiving inlet 12 is connected to a condensate pump; and the vent 13 is connected to an exhaust pump. These pumps are however not shown in the drawings.
  • the cooling water in a condenser 10 of this type is flowed through the condenser tubes 4 from right to left in Fig. 1, while the exhaust steam from the steam turbine is passed through the gap left among the condenser tubes 4 almost downwardly on the other hand, so as to perform a heat transference between the cooling water and the exhaust steam through the contact of both at the wall of the condenser tubes with a result of condensing the exhaust steam into water.
  • a coating operator enters into one, or both when it is necessary, of the condenser water boxes 6, 7 on the end portion of the condenser 10 for operating the spray nozzle there.
  • the operator works in the water box 6, he inserts a supplying hose 22 having a spray nozzle 21 on the tip thereof and respective passages for paint and compressed air into one side opening of a condenser tube 4 and continues to push it deeper therein until the spray nozzle 21 reaches, passing through the whole length (5-40 m) of it, the other end opening of the condenser tube 4 on the side of the water box 7.
  • the supplying hose 22 begins to be drawn back with a mechanical means at a predetermined speed, upon starting the spraying of the paint.
  • the paint to be sprayed and the compressed air are supplied from a paint reservoir (not shown) and an air transformer (not shown) respectively situated in the water box 6 or outside the condenser 10, through the separate passages.
  • the paint is atomized for being sprayed at the nozzle 21 with the aid of the compressed air in a well known way.
  • Such a coating process which is susceptible to various environmental conditions, such as temperature, humidity, etc., requires to be maintained at an optimum situation for forming a non-defective and uniform thick film.
  • the present invention is aimed at obtaining an optimum spraying conditoin of the paint through nebulization or atomization of the paint at the spray nozzle 21 by means of supplying the paint and the compressed air, through the respective passage in the supplying hose 22, heated at a most preferable temperature for coating such as 15-35°C.
  • FIG. 2 What is illustrated in Fig. 2 is an example of electrical heating means, being effective in realizing this invention and extremely simple in structure, wherein a front end portion of a nozzle is shown as an axial sectional view. The paint and the compressed air delivered thereto are heated there up to a predetermined temperature in a very short time.
  • a spray nozzle 21 of ordinary structure is provided with a paint passage 21 a in the central part and an air passage 21 b embracing the former completely in it for spraying the paint by the action of the compressed air in atomization state.
  • the supplying hose 22 to which the nozzle 21 is attached is composed of a flexible hose 23 of double-structure leading the paint and the compressed air from outside the condenser tube 4 and a metallic heating pipe 24 of a predetermined length for heating the paint and the compressed air delivered thereto by the flexible hose 23.
  • the flexible hose 23 is constituted of an inside tube 23a made of polyvinyl chloride or the like for forming a paint route or passage and a flexible outside tube 23b made of hard plastic for example hard nylon or metallic flexible tube being concentric with the inside tube 23a to form an air route or passage therebetween.
  • the heating pipe 24 which is attached with a joint. 25 to the tip of the flexible hose 23, just like the latter, of double structure consisting of an inside pipe 24a and an outside pipe 24b.
  • the inside pipe 24a is communicated with the inside tube 23a for forming a paint passage and the outside pipe 24b is communicated with the outside tube 23b for forming an air passage.
  • a sheathed heater 26 for example sheath element 0.2-1 mm ⁇ and external diameter of the sheath 1.6-4.8 mmo, as an electric heating means is wound like a coil for heating directly the compressed air and indirectly, via a pipe wall of the inside pipe 24a, the paint under the control of a thermostat 27 attached to the tip of the sheathed heater 26.
  • Power supply to the sheathed heater 26 is executed by a lead wire 28 extending through the outside tube 23b so far as to get out of the condenser tube 4; and the sheathed heater 26 is covered by a stainless-steel-made tube for being completely separated from the inside pipe 24a for feeding the paint, so there is no likelihood and no danger of a fire or an explosion.
  • the above- mentioned heating pipe 24 is, at the tip thereof, connected to the nozzle 21 by way of a joint 29; the inside pipe 24a is connected to a paint passage 21 a of the nozzle 21 and the outside pipe 24b is connected to an air passage 21 b of the nozzle 21.
  • the paint and the compressed air delivered from outside the condenser tube 4 through the flexible hose 23 are respectively heated to a predetermined temperature by the sheathed heater 26 at the heating pipe 24 for being immediately led to the nozzle 21, where the heated paint is sprayed in atomization by the action of the similarly heated compressed air.
  • the sheathed heater 26 for heating the paint and the compressed air from 5°C to 30°C respectively, under conditions where the compressed air gushing (blowing) amount is 300 I/min. and the paint discharged amount is 100 ml/min and the heater 26 has a length of 360 mm., it has to be maintained at 150°C under the control of the thermostat 27.
  • the length of the heating portion with the sheathed heater 26, i.e., the length of the heating pipe 24 may be suitably determined depending upon the compressed air amount, the paint discharge amount, the material quality of the heater's inserting portion, the heating condition, etc., with a variety of choice, for example, from ordinary length of approx. 300 mm to an extremely long case of covering the whole length of the supplying hose 22.
  • the same pipe is preferable to be flexible over the whole length from the view point of easiness of its handling, and required to be made of a material sufficiently resistant to a temperatue of 40-60°C. It is effective to employ a heat-resistant plastic for both the inside tube and the outside tube of the supplying hose 22 or employ a metallic flexible tube for the outside tube.
  • FIG. 3 another embodiment of this invention, wherein the similar sheathed heater to that in Fig. 2 is employed, is shown.
  • a spray nozzle 31 is connected therein by way of a joint 30 to a flexible hose 23 as the supplying hose 22.
  • a nozzle insert 31 a with a paint passage in the central part is coaxially threaded, and a nozzle cap 31b is threaded on the external side of the joint 30.
  • a gap formed between the nozzle insert 31 a and the nozzle cap 31 b constitutes a passage for the compressed air.
  • the outside tube 23b which delivers the compressed air in the flexible hose 23 of double structure, is firmly fitted; and at the same time on a metallic inner tube 30a, which is fitted into a central through-bore of the joint 30, the inside tube 23a for feeding the paint is firmly fitted.
  • a sheathed heater 32 is wound about for heating the paint and the compressed air by being supplied with power through a lead wire 28 running along the outside tube 23b, just like in the previous embodiment.
  • the outside tube 23b of the flexible hose 23 can be utilized, as it is, as an outside tube to the inner tube 30a, advantageously eliminating the putting of a separate metallic pipe as in Fig. 2.
  • FIG. 4 Still another embodiment with an electrical heating means such as a sheathed heater is shown in Fig. 4, wherein a flexible hose 23 as the supplying hose 22 is, unlike the previous ones, of triple structure. Between an inside tube 23a and an outside tube 23b a median tube 23c is coaxially disposed. On the external surface of the inside tube 23a a sheathed heater 33 is wound about, while a gap formed between the inside tube 23a and the median tube 23C is filled with a suitable heat conducting medium such as air, water, etc., which functions along with a sheathed heater 33 to heat the paint fed through the inside tube 23a and the compressed air fed through the outside tube 23b respectively _to a predetermined temper- atu re.
  • a suitable heat conducting medium such as air, water, etc.
  • the paint and the compresed air in the flexible tube 23 are maintained at a suitable temperature, even when the coating operation is temporarily suspended and the heating with the sheathed heater 33 is stopped by any chance, by the heat kept in the heat conducting medium.
  • the paint and the compressed air are advantageously protected from being affected by the ambient conditions immediately.
  • This structure is particularly useful in a system wherein the heating means is disposed ranging the whole length of the supplying hose 22.
  • a flexible hose 40 which extends from outside of the condenser tube 4 to a predetermined position in the condenser tube 4, is constituted of an outside tube 41 of hard plastic for forming a compressed air passage 41 a, a median tube 42 for forming a paint passage 42a, and an inside tube 43 of heat-resistant plastic for forming a passage (forward and backward) for heated fluid.
  • an outside tube 41 of hard plastic for forming a compressed air passage 41 a
  • a median tube 42 for forming a paint passage 42a
  • an inside tube 43 of heat-resistant plastic for forming a passage (forward and backward) for heated fluid.
  • Three of these are all coaxially arranged to make a triple structure.
  • a long partition is disposed in a diametric direction ranging the whole length of the tube to divide the inside into two parts, i.e., forward flowing passage 43a and a backward flowing passage 43b.
  • a spray nozzle 46 is attached by way of a suitable joint 45.
  • the inside tube 43 is not blocked by the joint 45, but the forward flowing passage 43a and the backward flowing passage 43b thereof are communicated to each other only in the end portion, that is, in the attaching portion of the spray nozzle 46. Accordingly, warm and heated water from a water supplying tank similarly disposed as the paint reservoir outside the condenser tube, or heated air (or other heated fluid) from a suitable heating means comes through the inside tube 43, specifically through the forward flowing passage 43a, to the vicinity of the attaching portion of the spray nozzle 46, where it is flowed back through the backward flowing passage 43b to outside of the condenser tube 4.
  • the amount of the medium used in the cylcing is, in contrast to the amount of the medium in a direct heating type hot air system, small and economical because of a possible small size of the heater capacity, outside the condenser tube 4.
  • a metallic heating tube of small length like one in Fig. 2 designated with 24, is attached in the above embodiment to a portion adjacent to the nozzle 46, the paint and the compressed air will be further stabilized in their required temperature.
  • the same object can be attained by incorporating a sheath heater in the inside tube 43 and by cycling only the air therethrough.
  • FIG. 7 Another example of heating by means of heated fluid can be seen in Fig. 7 or Fig. 8, either being effective.
  • a pair of small diametered tubes 51, 52 of heat resistant vinyl resin are respectively inserted into a pair of sections 50a, 50b formed in the flexible hose 50.
  • 51 is adapted to pass the paint and the other may be adapted for passing the compresed air; and one section 50a. is used as a forward flowing passage for the heating medium and the other section 50b as a backward fluid passage of the same.
  • sheathed heaters may be wound about each of the small diametered tubes 51, 52 in a coil style ranging the whole length of the tube for heating the paint and the compressed air.
  • a supplying hose 53 is divided into four sections, one pair of diagonally positioned sections 53a, 53c are used for the paint and the compressed air feeding, and the other diagonally positioned sections 53b, 53d are used for the forward flowing passage and the backward flowing passage of the heating medium.
  • Those supplying hoses 50, 53 are all connected via a suitable joint to a spray nozzle, and the heating medium is flowed through a forward flowing passage (50a, 53b), which is respectively one of the passages in the supplying hose, up to the vicinity of the connecting portion of the spray nozzle, where it is flowed back through respective backward flowing passage (50b, 53d) outside the system. While the heating medium is thus cycled from the forward flowing passage to the backward flowing passage, the paint and the compressed air are respectively heated, by way of the tube or hose wall, up to a predetermined temperature, so that the paint may be sprayed by the compressed air in a good spraying condition.
  • a spray gun preferably employable in the present invention is provided with a cylindrical outer casing 61, which is on either male-screwed end portions thereof threaded by a center guide 62 and 63, as illustrated in Fig. 9.
  • the center guides 62 and 63 are all of hexagonal form in cross section, having a dimension just inscribable in the inner surface of a tube-to-be-coated.
  • the hexagonal edge portions of the center guides 62, 63 are good for guiding the spray gun itself by being slided reciprocally along the inside of the tube.
  • a nozzle cap 64 is concentrically fastened thereto at a flange 64a thereof by the center guide 62.
  • An inner casing 65 having an external diameter smaller than the internal diameter of the outer casing 61 by a predetermined amount is disposed inside, and concentrically with, the outer casing 61.
  • a nozzle insert 68 having a through bore 68a in the axis thereof is threaded into.
  • a sheathed heater, as not shown, such as that illustrated in Fig. 2 is wound about on the external surface of the inner casing 65.
  • the nozzle insert 68 is provided with a hexagonal prism portion 68b which is inscribable in a hollow cylindrical portion 64b of the nozzle cap 64 and a conical portion 68c faced to a hollow conical space 64c of the nozzle cap 64 with a predetermined gap.
  • a hexagonal prism portion 68b which is inscribable in a hollow cylindrical portion 64b of the nozzle cap 64 and a conical portion 68c faced to a hollow conical space 64c of the nozzle cap 64 with a predetermined gap.
  • six straight but arch ceiling shaped spaces 69 are left lengthwise as seen in Fig. 12; on the surface of the nozzle insert 68 a spiral groove 70 is inscribed with a certain angle a to the axis thereof, as can be seen in Figs. 13 and 14.
  • the left end (in Fig. 9) of the inner casing 65 is threaded in a boss 61 a of the outer casing 61 as to leave a predetermined space 71 between the inner casing 65 and the outer casing 61.
  • a passage for the atomizing (spraying) gas is amde in the direction toward the nozzle cap 64.
  • the atomizing gas is supplied by an air hose 76 attached to the open end of the center guide 63; the air hose 76 is usually made into a double hose 75, i.e.
  • a supplying hose containing a paint supply passage 66 therein, for being inserted deep into, and drawn back out of a tube to be coated.
  • the boss 61 a is provided with a fitting 67 threaded thereinto, to the other end thereof the paint supply passage 66 is intended to be connected.
  • the fitting 67, the inner casing 65, and the through-bore 68a in the nozzle insert 68 constitute a route for supplying the paint.
  • the paint is supplied through an inside route of a double tube formed by the center guide 63 and the fitting 67, and atomizing gas led by the air hose 76 is supplied through an outside route of the double tube.
  • the paint coming through the fitting 67, the inner casing 65, and the through-bore 68a of the nozzle insert 68 is sprayed out of a tip portion 73 of the through-bore 68a; and the blowing gas such as compressed air is led forward through the through-holes 61 b and the space 71, and is further given a straight going force in the straight grooves 69 and a spirally advancing force through the spiral groove 70, before it is blown, getting through the space between the conical portion 68c of the nozzle insert 68 and the hollow conical space 64c of the nozzle cap 64, out of a gas blowing portion 72.
  • This blowing (or spraying) gas atomizes the paint gushing out of the tip portion 73 of the through-bore 68a of the nozzle insert 68, while spiraling the same, which enables the paint to be sprayed uniformly toward the inner surface of the tube-to-be-coated.
  • a double hose 75 having a spray nozzle 80 of this invention on the tip thereof, is inserted into the condenser tube 81 from one end opening 81 a thereof as far as the other end opening 81 b throughout the whole length (5-40 m) of the condenser tube 81.
  • the moment when the spray nozzle 80 has reached the other end opening 81 b of the condenser tube 81 spraying of the paint is commenced with atomization.
  • the paint and the atomizing gas are independently supplied through their respective passage, as mentioned above, before reaching the spray nozzle 80, where the former is sprayed in atomization due to the double directional spraying force of the latter, i.e., straight and spiral.
  • the double hose 75 is drawn back while spraying the paint from the spray nozzle 80, by means of a suitable mechanical means, at a predetermined constant speed from the other end opening 81 b toward the one end opening 81 a of the condenser tube 81.
  • the inner surface thereof is gradually and regularly coated with the atomized paint.
  • the whole length of the condenser tube 81 can thus be coated with a uniform thickness from one end to the other end thereof.
  • the spray nozzle 80 has returned to the one end opening 81 a, the supplying of the paint and the atomizing gas is suspended to stop the coating operation.
  • one condenser tube 81 is finished coating in this way another and a third tube will be coated in order successively in a similar way.
  • a condenser having a large number of condenser tubes can be coated or re-coated on the inner surface thereof quite smoothly and effectively.
  • the shape of the spiral groove or grooves 70 formed (inscribed) on the external surface of the nozzle insert 68 may be varied according to the internal diameter of the condenser tube 81 to be coated. It is appropriate in normal cases to determine the twist angle ⁇ formed between the spiral groove 70 and the axis of the nozzle insert 68 (see Fig. 13) in the range of 15-60°. And it is preferable to set the spray angle 0, that is a half of the vertical angle of the conical portion 68c of the nozzle insert 68, within the range of 5-45° so as to ensure the best spraying condition at a place 200 mm distant from the tip of the spray nozzle 80.
  • the nozzle insert 68 is provided with the hexagonal prism portion 68b which is easy in machining, but the shape of this prism portion is by no means limited to the hexagon. It is of course variable in various suitable ways to those skilled in the art, for example, quadrangular or octangular prism and so on, without any difficulty.
  • the paint used was:
  • the coating conditions were:
  • the result may be said surprisingly excellent considering the severe conditions under which the coating was carried out.

Landscapes

  • Nozzles (AREA)

Claims (11)

1. Procédé de revêtement de la surface intérieure d'un tube long (4) de petit diamètre, qui comprend: l'insertion, dans le tube long, d'un conduit d'alimentation qui est plus long que ledit tube long et comporte une buse de pulvérisation (21), fixée à son extrémité, et des passages respectifs (23a, 23b) pour conduire le milieu liquide de revêtement et le gaz comprimé à la buse; et la pulvérisation du milieu liquide de revêtement à la buse par l'action du gaz comprimé, en même temps que la buse de pulvérisation est déplacée d'un orifice d'extrémité du tube long à son autre orifice d'extrémité; caractérisé en ce que le conduit d'alimentation est un tuyau flexible (23) et en ce que le milieu liquide de revêtement et l'air comprimé sont chauffés à l'intérieur des dits passages respectifs, par transfert de chaleur à ces fluides au moins au voisinage de la région où la buse est fixée au tuyau flexible d'alimentation.
2. Procédé suivant la revendication 1, caractérisé en ce que le tube long (4) à revêtir est un tube de condenseur, ayant un diamètre intérieur dans la plage de 10 à 40 millimètres et une longueur dans la plage de 5 à 40 mètres, et en ce que sa surface intérieure est revêtue avec un film de revêtement d'une épaisseur de 10 à 30 microns.
3. Procédé suivant la revendication 1 ou la revendication 2, caractérisé en ce que le milieu liquide de revêtement et le gaz comprimé à amener la buse (21) sont chauffés à une température de 15° à 35°C dans les passages respectifs du tuyau d'alimentation.
4. Appareil de revêtement, pour revêtir la surface intérieure d'un tube long (4) de petit diamètre par pulvérisation d'un milieuliquide de revêtement d'une manière produisant de fines particules, pendant le déplacement de l'appareil d'un orifice d'extrémité à l'autre orifice d'extrémité du tube, comprenant: un conduit d'alimentation qui comporte intérieurement des passages respectifs (23a, 23b), pour l'amenée d'un milieu liquide de revêtement et de gaz comprimé, et une buse de pulvérisation (21) fixée à l'extrémité du conduit d'alimentation; caractérisé en ce que le conduit d'alimentation est un tuyau flexible (23) et en ce que des moyens de chauffage électrique (26) sont disposés au moins au voisinage de la région (24) où la buse est fixée au tuyau d'alimentation, pour chauffer le milieu liquide de revêtement et le gaz comprimé.
5. Appareil de revêtement suivant la revendication 4, caractérisé en ce que le tuyau d'alimentation (23) est de structure coaxiale et comprend un tube extérieur (23b) définissant un passage pour le gaz comprimé et un tube intérieur (23a) définissant un passage pour le milieu liquide de revêtement, et en ce que la partie du tuyau d'alimentation raccordée à la buse comporte un tube de chauffage (24) de structure coaxiale, sur la surface externe d'un tube intérieur (24a) duquel est enroulé un dispositif (26) de chauffage électrique.
6. Appareil de revêtement suivant la revendication 4, caractérisé en ce que le tuyau d'alimentation est de structure coaxiale triple, constituée d'un tube intérieur (23a), d'un tube intermédiaire (23c) et d'un tube extérieur (23b), et en ce que le dispositif (33) de chauffage électrique est placé dans un intervalle formé entre le tube intérieur et le tube intermédiaire, cet intervalle contenant un milieu conducteur de la chaleur, de sorte qu'en fonctionnement le milieu liquide de revêtement et le gaz comprimé à envoyer à la buse sont chauffés par le dispositif de chauffage électrique, par l'intermédiaire du milieu conducteur de la chaleur.
7. Appareil de revêtement suivant l'une quelconque des revendications 4 à 6, caractérisé en ce que le dispositif de chauffage électrique est une résistance protégée (33).
8. Buse pour appareil de revêtement continu et progressif de la surface intérieure d'un tube par pulvérisation, pendant son déplacement à l'intérieur et dans la direction axiale du tube (4), comprenant: un chapeau de buse (64), qui comporte une partie cylindrique creuse, et un insert de buse (68) prévu pour être placé dans le chapeau de buse (64) et qui comporte au moins une gorge hélicoïdale (70) sur sa surface externe et un passage d'alimentation (68a) pour le milieu liquide de revêtement; caractérisée en ce que le chapeau de buse (64) comporte une partie conique creuse (64c) s'étendant à partir de la partie cylindrique creuse, un orifice (72) étant prévu à la pointe de cette partie conique creuse pour le soufflage de gaz par cet orifice, la partie conique creuse convergeant vers cet orifice, et en ce que l'insert de buse (68) comprend une partie prismatique (68b), comportant au moins une gorge hélicoïdale 70 sur sa surface externe, une partie conique (68c) s'étendant à partir de cette partie prismatique, et un passage d'alimentation (68a) pour le milieu liquide de revêtement s'étendant à travers l'insert le long de son axe, l'insert de buse (68) étant prévu pour s'ajuster dans la partie cylindrique creuse (64b) du chapeau de buse, sa partie conique (64c) étant espacée par un petit intervalle de la surface intérieure de la partie conique creuse, une pluralité de gorges allongées ou d'espaces sensiblement rectilignes étant définis entre les parois latérales de la partie prismatique (68b) et la surface cylindrique intérieure du chapeau de buse, de sorte que le gaz de pulvérisation, lorsqu'il est amené par l'espace compris entre le chapeau de buse et l'insert de buse, est soumis à une force longitudinale par la pluralité de gorges allongées ou d'espaces rectiligne définis entre la surface intérieure du chapeau de buse et chacune des faces de la partie prismatique et à une force de rotation par la gorge ou les gorges (70) hélicoïdales et sort par l'orifice d'extrémité (72) de manière à pulvériser hélicoïdalement, afin de produire de fines particules, le milieu liquide de revêtement amené par le passage le long de l'axe de l'insert de buse.
9. Buse suivant la revendication 8, caractérisée en ce que la partie prismatique (68b) de l'insert de buse est de forme hexagonale, en coupe transversale, et en ce que la gorge hélicoïdale (70) ménagée sur la surface externe de la partie prismatique est inclinée par rapport à l'axe de l'insert de buse (68), suivant un angle d'inclinaison dans la plage de 15 à 60°.
10. Buse suivant la revendication 8 ou la revendication 9, caractérisée en ce que la gorge hélicoïdale (70) ménagée sur la surface externe de la partie prismatique (68b) se prolonge suffisamment loin sur la partie conique de l'insert de buse, de sorte que l'écoulement hélicoïdal du gaz de pulvérisation est conduit jusqu'à l'orifice de soufflage de gaz du chapeau de buse.
11. Buse suivant l'une quelconque des revendications 8 à 10, caractérisée en ce que le demi-angle au sommet de la partie conique (68c) de l'insert de buse (68) est compris entre 5 et 45°.
EP19800303602 1979-10-25 1980-10-13 Procédé, appareil et buse de pulvérisation pour revêtir la surface intérieure de tubes longs et de petit diamètre Expired EP0028088B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP147890/79 1979-10-25
JP1979147890U JPS6110775Y2 (fr) 1979-10-25 1979-10-25
JP6368180A JPS56161870A (en) 1980-05-14 1980-05-14 Method and apparatus for coating long pipe having small diameter
JP63681/80 1980-05-14

Publications (2)

Publication Number Publication Date
EP0028088A1 EP0028088A1 (fr) 1981-05-06
EP0028088B1 true EP0028088B1 (fr) 1984-02-08

Family

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Application Number Title Priority Date Filing Date
EP19800303602 Expired EP0028088B1 (fr) 1979-10-25 1980-10-13 Procédé, appareil et buse de pulvérisation pour revêtir la surface intérieure de tubes longs et de petit diamètre

Country Status (2)

Country Link
EP (1) EP0028088B1 (fr)
DE (1) DE3066513D1 (fr)

Cited By (1)

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WO2022152765A1 (fr) * 2021-01-12 2022-07-21 Säkaphen Gmbh Installation de projection d'un agent de revêtement sur des parois intérieures de tubes et appareil de projection pour cette installation

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US4368219A (en) * 1980-06-13 1983-01-11 Sumitomo Light Metal Industries Ltd. Method and apparatus for coating the inner surface of long tubes of small diameter
GB2145014A (en) * 1983-08-12 1985-03-20 Anthony Joseph Torntore Material spraying apparatus
BE1000767A7 (nl) * 1987-07-16 1989-03-28 Recticel Werkwijze en inrichting voor het vormen van een laag polyurethaan op een oppervlak door spuiten.
DE3800448A1 (de) * 1988-01-09 1989-07-20 Ribnitz Peter Verfahren und vorrichtung zur durchlaufbeschichtung von werkstuecken
FR2715084B1 (fr) * 1994-01-14 1996-04-05 Ryser Sarl Ets Ernest Procédé et dispositif pour appliquer un enduit dans une canalisation enterrée.
US6334579B1 (en) 1999-02-18 2002-01-01 Honeywell Measurex Devron Inc. Air atomizing nozzle
JP2005188666A (ja) * 2003-12-26 2005-07-14 Toray Eng Co Ltd 送液パイプおよび送液システム
DE102007017768B4 (de) * 2007-04-16 2010-02-11 Innovaris Gmbh & Co. Kg Heißgaserzeuger für eine thermische Spritzmaschine
CN103316792B (zh) * 2013-06-26 2016-03-02 电子科技大学 制备有机纳米线的气相喷涂装置及Alq3纳米线的制备方法
EP3205407B1 (fr) 2016-02-09 2019-09-25 IPR-Intelligente Peripherien für Roboter GmbH Procede et installation destines a revetir les parois interieures d'un espace creux a l'aide d'une couche de protection anticorrosion a base de cire
CN113578616A (zh) * 2021-08-25 2021-11-02 重庆忠泽科技有限公司 复合钢管内衬喷涂装置及复合钢管
CN115178410B (zh) * 2022-08-24 2023-07-18 赣州市桐鑫金属制品有限公司 一种金属围栏生产用外壁油漆喷涂机
CN115301431B (zh) * 2022-09-14 2023-08-15 华能国际电力股份有限公司 火电机组锅炉管内壁用高粘度浆料雾化喷头

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DE466932C (de) * 1928-11-06 Joh Weinlich Duese fuer Farbzerstaeuber
US2314329A (en) * 1938-03-12 1943-03-23 Walter M Ericson Art of spraying coatings, particularly asphaltic coatings and the like
US2520397A (en) * 1946-12-05 1950-08-29 Marion C Green Spraying apparatus for internally coating pipes
US2576942A (en) * 1948-07-06 1951-12-04 American Can Co Apparatus for the continuous spraying of individual container bodies
US2984421A (en) * 1958-08-11 1961-05-16 Sarah A Hession Adjustable aerosol device
FR88147E (fr) * 1963-12-14 1966-12-16 Dispositif de chauffage d'un courant fluide

Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2022152765A1 (fr) * 2021-01-12 2022-07-21 Säkaphen Gmbh Installation de projection d'un agent de revêtement sur des parois intérieures de tubes et appareil de projection pour cette installation

Also Published As

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EP0028088A1 (fr) 1981-05-06
DE3066513D1 (en) 1984-03-15

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