JP2018168414A - Spray device of slurry containing fine particle, and spray system of the same - Google Patents

Abstract

To suppress narrowing of a slurry transfer pipe while almost uniformly distributing atomized slurry containing fine particles when introducing the slurry to gas flame via the slurry transfer tube.SOLUTION: A slurry spray device 100 is equipped with a combustion chamber 105 for generating gas flame by burning fuel with oxygen, a gas nozzle 130 for supplying oxygen and fuel to the combustion chamber 105, and a slurry transfer pipe 80 installed coaxially inside the gas nozzle 130 for transferring slurry containing fine particles as a spray material to the gas flame. The slurry containing fine particles is sprayed by the introduced thermal fluid. The slurry transfer pipe 80 is a double pipe having an inner pipe 81 in which the slurry containing fine particles flows and an outer pipe 82 arranged outside the inner pipe 81 with a clearance in between. A cooling medium is supplied to the clearance between the inner pipe 81 and the outer pipe 82.SELECTED DRAWING: Figure 12

Description

  The present invention relates to a fine particle-containing slurry thermal spraying apparatus and a thermal spraying system including the thermal spraying apparatus.

  In recent years, it has been strongly desired to form a dense sprayed coating excellent in heat resistance and coating strength on the surface of a coating material while suppressing the occurrence of voids and cracks. As a method therefor, Patent Document 1 discloses the use of heat-resistant fine particles as a thermal spray material. Specifically, a fine particle-containing slurry in which fine particles are dispersed in an organic solvent is prepared, and the fine particles are sprayed onto the sprayed material while disappearing the organic solvent by introducing the slurry into a combustion flame in a sprayed state. To do.

  The thermal spray apparatus includes, for example, a combustion chamber that generates a gas flame in which combustion gas is combusted, a gas nozzle that supplies the combustion gas to the combustion chamber, and a slurry transport pipe that transports the fine particle-containing slurry toward the combustion chamber, The thermal spraying device in which the fine particle-containing slurry is introduced into the gas flame is sprayed toward the sprayed material.

JP, 2014-213214, A

  Patent Document 1 discloses that in order to uniformly disperse the fine particle-containing slurry by the gas frame, a slurry conveying pipe is coaxially disposed inside the gas nozzle, and the fine particle-containing slurry is supplied coaxially to the gas frame. ing. In this case, since the outlet end portion of the slurry transport pipe opens into the combustion chamber, the temperature may be excessively increased as a result of being exposed to the gas flame.

  In this case, the fine particle-containing slurry is heated when passing through the outlet end portion of the slurry carrying tube. As a result, in the fine particle-containing slurry, the organic solvent may disappear, and the fine particles may adhere to the inside of the slurry transport tube. In particular, when a fine particle-containing slurry containing nano-particles is used as the fine particles, the nanoparticles tend to adhere to the inner wall due to friction with the inner wall of the slurry-conveying tube, resulting in narrowing of the slurry-conveying tube. , Defects in the transport of fine particles occur.

  The present invention provides a fine particle-containing slurry spraying apparatus capable of suppressing narrowing of a slurry conveyance pipe while substantially uniformly distributing the fine particle-containing slurry in a sprayed state when introduced into a gas frame via a slurry conveyance pipe, and It aims at providing the thermal spraying system provided with this thermal spraying apparatus.

  The fine particle-containing slurry spraying apparatus according to the first invention of the present application includes a combustion chamber that generates a gas flame in which oxygen and fuel are combusted, a gas nozzle that supplies the oxygen and the fuel to the combustion chamber, and an inner diameter side of the gas nozzle. A slurry conveying pipe that is arranged coaxially and conveys the fine particle-containing slurry to the gas frame as a thermal spray material. The slurry is thermally sprayed by a thermal fluid in which the fine particle-containing slurry is introduced into the gas frame. The transport pipe is a double pipe having an inner pipe through which the fine particle-containing slurry flows and an outer pipe arranged at an interval on the outer peripheral side, and a cooling medium is provided between the inner pipe and the outer pipe. It is characterized by being supplied.

  The fine particle-containing slurry spraying apparatus according to the first invention preferably further comprises the following configuration.

(A) The slurry conveying pipe is configured such that the cooling medium is discharged toward the combustion chamber from between the inner pipe and the outer pipe.

(B) The gas nozzle has an oxygen supply path for supplying the air to the combustion chamber, and a fuel supply path for supplying the fuel to the combustion chamber. The oxygen supply path and the fuel supply path Are configured as separate systems.

(C) In the configuration (B), the oxygen supply path has a plurality of first inclined holes that communicate with the combustion chamber, and the fuel supply path has a plurality of second inclined holes that communicate with the combustion chamber. A plurality of the first inclined holes and the second inclined holes are arranged such that openings at the outlet end of the gas nozzle are alternately arranged on the same circumference, and The central axis is inclined at substantially the same angle on the radial side toward the combustion chamber.

(D) It has a cap attached to the outer peripheral portion of the gas nozzle and extending in the spraying direction, the combustion chamber is defined inside, and a scavenging medium is supplied to the inner peripheral wall surface of the cap It is like that.

(E) In the configuration (D), the cap has a flow passage restricting portion.

(F) The fine particle-containing slurry is a nanoparticle-containing slurry, and is supplied to the slurry transport tube in a state where the nanoparticle-containing slurry is atomized.

  Moreover, the fine particle-containing slurry spraying system according to the second invention of the present application is a fine particle-containing slurry spraying device according to the first invention, and a slurry spraying device that atomizes the fine particle-containing slurry and supplies the slurry to the slurry conveying pipe. The slurry spraying device further includes a slurry supply device that supplies the fine particle-containing slurry.

  The fine particle-containing slurry spraying system according to the second invention preferably further comprises the following configuration.

(A) The slurry supply apparatus has a cassette type syringe pre-filled with a thermal spray material.

(B) a slurry supply path connecting the slurry supply apparatus and the slurry spraying apparatus; and a slurry control valve provided in the slurry supply path and capable of opening and closing the path; A slurry inlet part to which the slurry supply apparatus is connected via the slurry supply path, a slurry outlet part to which the slurry spraying apparatus is connected via the slurry supply path, the slurry inlet part and the slurry outlet A first valve seat formed at a connection portion between the slurry inlet portion and the flow path connection chamber, and a connection between the slurry outlet portion and the flow path connection chamber. The second valve seat formed in the part and provided in the flow path connection chamber, and abuts against the first valve seat and the second valve seat, and these valve seats. A valve body that is movable between a valve closing position that closes a valve and a valve opening position that is spaced apart from the first valve seat and the second valve seat and opens these valve seats, The valve seat and the second valve seat are inclined with respect to the moving direction of the valve body.

(C) In the configuration (b), the valve body has a through-hole penetrating in the moving direction, and the flow path connection chamber is located on one side of the valve body in the moving direction of the valve body. The space defined on the other side and the space defined on the other side communicate with each other through the through hole.

(D) In the configuration (b), the valve body is elastically biased toward the first valve seat and the second valve seat in the valve closed position.

(E) In the configuration (b), the slurry control valve is controlled to the valve open position when the pressure of the fine particle-containing slurry supplied from the slurry supply device is equal to or higher than a predetermined pressure. ing.

(F) In the configuration (e), the predetermined pressure of the fine particle-containing slurry is higher than a pressure of a spray medium for the slurry spraying device to spray the fine particle-containing slurry.

  According to the first aspect, since the temperature rise of the slurry transport pipe is suppressed, it is possible to suppress the fine particles from being fixed to the inner wall surface of the inner pipe of the slurry transport pipe by heat.

  According to the above configuration (A), the fine particle-containing slurry is blown off toward the thermal fluid by the medium at the outlet end portion of the slurry conveyance tube. Therefore, since the dripping of the fine particle-containing slurry is suppressed at the outlet end portion of the slurry supply pipe, the adhesion of the fine particles at the outlet end portion can be suppressed.

  According to the above configuration (B), oxygen and fuel are mixed at a position away from the gas nozzle in the combustion chamber, so that the gas flame is generated at a position away from the gas nozzle. As a result, since heat input from the gas frame to the gas nozzle is suppressed, an increase in the temperature of the slurry transport pipe arranged coaxially with the gas nozzle is suppressed. Therefore, sticking of fine particles in the slurry transport pipe is suppressed.

  According to the above configuration (C), a gas flame having a good combustion state can be obtained from a mixed gas in which oxygen and fuel are substantially uniformly mixed while oxygen and fuel are supplied to the combustion chamber by separate systems. In addition, since the gas frame is generated on the axis of the slurry transport tube, a thermal fluid containing the fine particle-containing slurry substantially uniformly is obtained. As a result, a sprayed coating in which the fine particles are sprayed substantially uniformly is obtained.

  According to the configuration (D), the fine particle-containing slurry is scavenged from the inner peripheral wall surface of the air cap by the scavenging medium, and the temperature rise of the air cap is suppressed. Thereby, adhesion of fine particles on the inner peripheral wall surface of the air cap is suppressed.

  According to the said structure (E), it is easy to discharge | emit a thermal fluid to a thermal spraying direction by the venturi effect in a flow-path throttle part. Therefore, the adhesion of fine particles on the inner peripheral wall surface of the air cap is further suppressed.

  According to the said structure (F), it can spray by suppressing that a nanoparticle adheres and deposits with a thermal spraying apparatus.

  According to the second aspect of the invention, the slurry spray device is supplied with the fine particle-containing slurry by the slurry supply device provided outside, so that it is not necessary to provide a slurry reservoir for storing the fine particle-containing slurry and is compact. Can be configured. Moreover, the supply amount, supply speed, and supply pressure of the fine particle-containing slurry can be finely controlled by the slurry supply device.

  According to the configuration (a), by replacing the cassette type syringe, it is possible to easily replenish the fine particle-containing slurry and to easily switch to a different type of slurry. Further, by exchanging the entire syringe, the trouble of removing the fine particle-containing slurry remaining in the slurry supply device can be omitted. Furthermore, by using a small volume type (for example, 50 cc) syringe, a fine particle-containing slurry containing expensive fine particles can be used without waste.

  According to the configuration (b), since the valve body does not slide on the valve seat, the biting of the fine particle-containing slurry between the valve seat and the valve body is suppressed. As a result, wear on the valve seat and the valve body is also suppressed. Furthermore, since the valve body is disposed in the flow path connection chamber, the flow path of the slurry inlet portion and the slurry outlet portion is not narrowed by the valve body, and it is easy to ensure the flow rate of the fine particle-containing slurry.

  According to the configuration (c), the valve body can be moved quickly without the fine particle-containing slurry in the flow path connection chamber blocking the movement of the valve body. Thereby, a slurry control valve can be opened and closed quickly.

  According to the configuration (d), it is possible to mitigate the impact when the valve body is seated on the valve seat when the valve is closed. Thereby, the wear of the valve body and the valve seat can be suppressed, and the durability of the slurry control valve can be improved.

  According to the above configuration (e), since the fine particle-containing slurry is supplied to the slurry spraying apparatus in a state where the pressure is higher than a predetermined pressure, it is atomized so as to have a substantially uniform particle size. Therefore, a dense sprayed coating can be obtained by spraying using the spray.

  According to the configuration (f), the fine particle-containing slurry can be introduced into the spraying device against the spraying pressure.

  According to the fine particle-containing slurry spraying apparatus and the thermal spraying system including the thermal spraying apparatus according to the present invention, when the sprayed fine particle-containing slurry is introduced into the gas frame via the slurry conveying pipe, the distribution is substantially uniform. It is possible to suppress the narrowing of the slurry conveying pipe.

It is the schematic of the thermal spraying system which concerns on one Embodiment of this invention. It is sectional drawing of a slurry supply apparatus. It is sectional drawing of a slurry control valve. It is sectional drawing in the IV-IV line of FIG. It is sectional drawing in the VV line of FIG. It is a figure explaining the action | operation of a slurry control valve. It is sectional drawing of a spraying apparatus. It is sectional drawing in the VIII-VIII line of FIG. It is sectional drawing in the IX-IX line of FIG. It is sectional drawing in the XX line of FIG. It is sectional drawing in the XI-XI line of FIG. It is a longitudinal cross-sectional view of a thermal spraying apparatus. It is sectional drawing in the XIII-XIII line | wire of FIG. It is a rear view of the slurry spraying apparatus by A arrow view of FIG. It is a front view of the slurry spraying apparatus by the arrow B of FIG. It is sectional drawing in the XVI-XVI line | wire of FIG. It is sectional drawing in the XVII-XVII line of FIG. It is sectional drawing in the XVIII-XVIII line of FIG. It is a figure which shows typically the action | operation of a slurry spraying apparatus.

(overall structure)
FIG. 1 shows a thermal spray system 1 according to an embodiment of the present invention. The thermal spraying system 1 uses a fine particle-containing slurry in which fine particles are dispersed in an organic solvent as a spraying material, and sprays the fine particles on the material to be sprayed W.

  The thermal spraying system 1 (fine particle-containing slurry thermal spraying system) includes a slurry supply device 10, a slurry control valve 30, a slurry spraying device 50, a slurry transport pipe 80, and a slurry thermal spraying device 100 (fine particle-containing slurry thermal spraying device). The fine particle-containing slurry is supplied from the slurry supply device 10 to the slurry spraying device 50 via the slurry control valve 30. Next, the fine particle-containing slurry is atomized by the slurry spraying device 50 and then transported to the slurry spraying device 100 via the slurry transporting pipe 80. The slurry spraying apparatus 100 causes the organic solvent of the fine particle-containing slurry to disappear by the gas flame, and sprays the fine particles toward the material to be sprayed W.

  Further, in the thermal spraying system 1, the above devices / equipment are mounted on the robot arm 2. Furthermore, the thermal spraying system 1 includes a control device 3 schematically shown in FIG.

[Slurry feeder]
FIG. 2 shows a longitudinal sectional view of the slurry supply apparatus 10. The slurry supply apparatus 10 includes a syringe 11, a plunger 14 disposed in the syringe 11 so as to be able to advance and retreat, a pusher rod 16 that pushes the plunger 14 in the axial direction of the syringe 11, and an axis of the syringe 11 that pushes the pusher rod 16. And a drive unit 20 that moves forward and backward along the direction. Further, in the slurry supply apparatus 10, each of the above members is attached to the base plate 17.

  In the following description, the moving direction of the plunger 14 that discharges the contents (fine particle-containing slurry) filled therein from the syringe 11 is referred to as the front of the slurry supply device 10, and the opposite direction, that is, the syringe 11 is filled with the contents. The moving direction of the plunger 14 is referred to as the rear of the slurry supply device 10. Further, the vertical direction in the figure is referred to as the vertical direction of the slurry supply apparatus 10.

(Syringe)
The syringe 11 is a cassette-type syringe that is pre-filled with a fine particle-containing slurry as a thermal spray material, and has a discharge port 11a with a reduced diameter at the front end. The syringe 11 has a distal end portion 12 having a discharge port 11a and a main body portion 13 extending continuously rearwardly. The distal end portion 12 is formed in a conical shape whose inner surface is reduced in diameter toward the front. The main body 13 is formed in a cylindrical shape.

  In the syringe 11, the main body 13 is sandwiched in the vertical direction by an upper and lower halved clamp 18 on the upper side of the base plate 17, and the distal end portion 12 is inserted into the joint block 19 from behind and supported. By opening the half-clamp 18, the syringe 11 can be easily attached and detached from the slurry supply device 10.

  As a result, replenishment of the fine particle-containing slurry can be facilitated, and switching to a different type of slurry can be facilitated. Further, by replacing the syringe 11 together, the trouble of removing the fine particle-containing slurry remaining in the slurry supply device 10 can be omitted.

  The capacity | capacitance of the syringe 11 is comprised by the small capacity | capacitance (for example, maximum capacity is 50 cc or less). By setting the volume of the syringe 11 to a small volume, the fine particle-containing slurry filled therein can be used up easily. Thus, the fine particle-containing slurry can be suppressed from remaining in the syringe 11 and can be used efficiently while suppressing waste. In particular, when an expensive nanoparticle-containing slurry (for example, yttrium oxide or the like) is employed as the fine particle-containing slurry, cost can be effectively reduced by suppressing waste. Further, by making the syringe 11 a small capacity type, the slurry supply device 10 can be made compact, and the mountability to the robot arm 2 is good.

  Further, as indicated by phantom lines in FIG. 2, the syringe 11 may be configured to be divided into the front end portion 12 and the main body portion 13 in the front-rear direction. In this case, the fine particle-containing slurry remaining in the syringe 11 can be easily recovered, and waste can be suppressed by this.

(Plunger)
The plunger 14 seals the inside of the syringe 11 on the rear side and is configured to be movable in the front-rear direction. The plunger 14 has a conical portion 15 that substantially matches the inner surface shape of the distal end portion of the syringe 11 on the front end side. In the state where the plunger 14 is located at the front end portion in the syringe 11, the conical portion 15 substantially matches the inner surface shape of the distal end portion 12 of the syringe 11, so that the dead space of the syringe 11 can be reduced and the fine particle-containing slurry is not wasted. Can be extruded.

(Pusher rod)
The pusher rod 16 is a rod-like member that extends in the front-rear direction above the base plate 17 and abuts against the plunger 14 from the rear side at the front end.

(Drive part)
The drive unit 20 includes a drive motor 21, a coupling 22, a ball screw 23, a nut receiver 24, a carriage 25, a linear guide 26, and a bracket 27. The drive motor 21 is attached to the lower side of the base plate 17, and a ball screw 23 is connected to the output shaft via a coupling 22. The ball screw 23 extends in the front-rear direction, and a nut receiver 24 is screwed into the middle part of the ball screw 23. A carriage 25 is attached to the upper portion of the nut receiver 24.

  Here, a slot 17a extending in the front-rear direction is formed through the base plate 17 vertically. The carriage 25 extends from below the base plate 17 through the slot 17a. The carriage 25 is guided to move in the front-rear direction by a linear guide 26. A bracket 27 is attached to the upper portion of the carriage 25. The rear end portion of the pusher rod 16 is fixed to the bracket 27.

  That is, the slurry supply apparatus 10 can move the pusher rod 16 forward via the ball screw 23, the nut receiver 24, and the carriage 25 by driving and controlling the drive motor 21. As a result, the plunger 14 is pushed by the pusher rod 16 and moves forward in the syringe 11, so that the fine particle-containing slurry charged in the syringe 11 is discharged from the discharge port 11a in a pressurized state. ing.

  Note that a stepping motor (for example, a five-phase stepping motor) may be employed as the drive motor 21. In this case, the moving speed and / or moving amount of the carriage 25 can be controlled by controlling the rotating speed and / or rotating amount of the drive motor 21 via the control device 3. Thereby, the discharge amount, discharge speed, and discharge pressure of the fine particle-containing slurry pushed out from the syringe 11 can be controlled.

  The joint block 19 is formed with a communication hole 19a that allows the first slurry supply pipe 5 connected to the front side and the discharge port of the syringe 11 to communicate with each other. The first slurry supply pipe 5 is a pipe connecting the slurry supply apparatus 10 and the slurry control valve 30, and an upstream portion of the slurry supply path connecting the slurry supply apparatus 10 and the slurry spraying apparatus 50 in the pipe. Is defined.

  In addition, a pressure sensor 28 is disposed above the joint block 19. The pressure of the fine particle-containing slurry in the communication hole 19a is measured by the pressure sensor 28. The control device 3 controls the drive motor 21 based on the pressure value of the fine particle-containing slurry in the communication hole 19a measured by the pressure sensor 28, and further controls the opening and closing of the slurry control valve 30 as will be described later.

  For example, when the detected pressure of the fine particle-containing slurry is higher than a predetermined pressure, the control device 3 judges that the slurry supply path is blocked and stops the drive motor 21 to make it impossible to block the slurry. Failures such as leakage and breakage due to extrusion are prevented.

  If the detected pressure of the particulate-containing slurry is lower than the other predetermined pressure, it is determined that the pusher rod 16 is not in contact with the plunger 14 and the rotation of the drive motor 21 is increased. It can be brought into contact with the plunger 14 at an early stage. Thereby, the idle running time of the pusher rod 16 can be shortened, and the fine particle-containing slurry can be pushed out efficiently.

[Slurry control valve]
FIG. 3 is a longitudinal sectional view of the slurry control valve 30, and shows a case where the slurry control valve 30 is in a closed state. The slurry control valve 30 is provided in the middle of the slurry supply path, and is configured to be able to open and close the slurry supply path under the control of the control device 3. The slurry control valve 30 includes a main body casing 31 to which a slurry supply path is connected, a valve body 40 disposed inside the main body casing 31, and a cylinder 38 that moves the valve body 40 up and down.

  The slurry supply path is at least defined by the first slurry supply pipe 5 that connects the slurry supply apparatus 10 and the slurry control valve 30 and the second slurry supply pipe 6 that connects the slurry control valve 30 and the slurry spray apparatus 50. It is configured. Further, in the following description, in the slurry supply path, the direction toward the slurry supply device 10 as viewed from the slurry control valve 30 is referred to as the upstream side of the slurry supply direction, and the direction toward the slurry spray device 50 is referred to as the slurry supply direction. It is called the downstream side.

(Main body casing)
The main body casing 31 has a slurry inlet part 32 to which the slurry supply device 10 is connected via the slurry supply path, a slurry outlet part 33 to which the slurry sprayer 50 is connected via the slurry supply path, and a slurry inlet part 32. And a flow path connection chamber 34 for connecting the slurry outlet 33 is formed. The slurry inlet portion 32, the slurry outlet portion 33, and the flow path connection chamber 34 are filled with the fine particle-containing slurry.

  That is, in the state where the slurry inlet portion 32 and the slurry outlet portion 33 communicate with each other via the flow path connection chamber 34, when the fine particle-containing slurry is newly supplied from the slurry supply device 10 to the slurry control valve 30, The fine particle-containing slurry in the slurry inlet portion 32 is pushed out to the flow path connection chamber. Along with this, the fine particle-containing slurry in the flow path connection chamber 34 is pushed out to the slurry outlet portion 33, and the fine particle-containing slurry in the slurry outlet portion 33 is pushed out to the second slurry supply pipe 6.

  A valve body 40 is disposed in the flow path connection chamber 34 so as to be movable up and down. The flow path connection chamber 34 is divided into an upper chamber 34 a and a lower chamber 34 b above and below by the valve body 40. The flow path connection chamber 34 is configured in an inverted trapezoidal shape (also referred to as a wedge shape) that becomes narrower in the downward direction in a cross-sectional view shown in FIG. A first valve seat 35 that is inclined downward toward the downstream side of the slurry supply path is formed between the flow path connection chamber 34 and the slurry inlet portion 32. A second valve seat 36 that is inclined downward toward the upstream side of the slurry supply path is formed between the flow path connection chamber 34 and the slurry outlet portion 33.

  The slurry inlet portion 32 is formed at a substantially right angle with respect to the first valve seat 35 at the connection portion with the flow path connection chamber 34, and extends in a direction inclined downward toward the upstream side in the slurry supply direction. Yes. Similarly, the slurry outlet portion 33 is formed at a substantially right angle with respect to the second valve seat 36 at the connection portion with the flow path connection chamber 34, and is inclined downward toward the downstream side in the slurry supply direction. It extends to.

  Thereby, each of the slurry inlet portion 32 and the slurry outlet portion 33 can efficiently secure the flow passage area of the orifice portion formed in the connection portion with the flow passage connection chamber 34 and passes through the orifice portion. The pressure loss of the fine particle-containing slurry is reduced.

  FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. The flow path connection chamber 34 is configured in a substantially rectangular shape in FIG. 4, and a first valve seat 35 and a second valve seat 36 are formed on a pair of side surfaces facing the slurry supply direction, and the slurry supply direction Guide grooves 37 that are recessed in a direction intersecting with the slurry supply direction are respectively formed on a pair of side surfaces that face each other in the direction intersecting with. Referring also to FIG. 5 which is a cross-sectional view taken along line V-V in FIG. 4, the guide groove 37 extends in the vertical direction.

(Cylinder)
As shown in FIG. 3, the cylinder 38 is located above the main body casing 31 and has a rod 38 a that can protrude and retract in the vertical direction on the lower surface side. The cylinder 38 can adopt, for example, an air-operated type, and in this case, the rod 38a can be protruded and retreated at high speed by being controlled by the control device 3.

  A drive rod 39 extending downward is attached to the lower end of the rod 38a. A valve body 40 is attached to the tip of the drive rod 39 so as to be movable up and down. The valve body 40 is urged downward by a coil spring 49 at the upper end portion, and is supported from below by a fastening nut 39a fastened to the rod 38a at the lower end portion.

(Valve body)
The valve body 40 has a first valve surface 41 and a second valve surface 42 that are parallel to the first valve seat 35 and the second valve seat 36, and is narrower in the downward direction in the cross-sectional view shown in FIG. The reverse trapezoid shape (it is also called a wedge shape) becomes. A through-opening 43 through which the tip of the drive rod 39 is inserted vertically is formed at the center of the valve body 40. On the upper surface side of the valve body 40, a spring seat 44 is formed by countersinking around the through-opening 43 around the lower end of the coil spring 49. On the lower surface side, a drive rod is formed around the through-opening 43. A nut housing portion 45 for housing a fastening nut 39a fixed to the tip end portion of 39 is formed by countersinking.

  Further, the valve body 40 is configured in a substantially rectangular shape in the cross-sectional view shown in FIG. 4, and the first valve surface 41 and the second valve surface 42 are formed on a pair of side surfaces facing in the slurry supply direction. In addition, guide protrusions 46 are formed on the pair of side surfaces that face each other in the direction intersecting with the slurry supply direction and project in a direction intersecting with the slurry supply direction. The guide protrusion 46 is located inside the guide groove 37 so that each wall surface is substantially in contact with each groove wall surface constituting the guide groove 37 or opposed to each other through a minute gap. Is formed. Referring also to FIG. 5, a pair of guide protrusions 46 are formed above and below a scraper groove 48 described later.

  Further, the valve body 40 is formed with a pair of communicating holes 47 penetrating vertically on both sides of the through opening 43 in a direction intersecting the slurry supply direction. As shown in FIG. 5, a scraper groove 48 extending in the slurry supply direction is formed in the middle portion in the vertical direction on the pair of side surface portions on which the guide protrusions 46 are formed.

(Slurry control valve operation)
The slurry control valve 30 moves the valve body 40 between the valve closed position and the valve open position by the vertical movement of the rod 38a of the cylinder 38. In the valve closed position shown in FIG. 3, the valve body 40 is located at the lower end, and the first and second valve surfaces 41 and 42 close the first and second valve seats 35 and 36, and the slurry inlet portion. 32 and the slurry outlet 33 are not in communication. 6A, the valve body 40 is positioned at the upper end, and the first and second valve surfaces 41 and 42 are positioned away from the first and second valve seats 35 and 36. Thus, the slurry inlet portion 32 and the slurry outlet portion 33 communicate with each other.

  Hereinafter, referring to FIG. 6, the slurry control valve 30 when the valve body 40 moves from the valve open position (FIG. 6A) to the valve closed position (FIGS. 6B and 6C). The operation will be described.

  In the valve open position shown in FIG. 6A, the rod 38a of the cylinder 38 is held at the upper end (retreat side) moving end position (retreat position). In this state, the valve body 40 is pulled upward by the fastening nut 39a, and the first valve surface 41 and the second valve surface 42 are spaced apart from the first valve seat 35 and the second valve seat 36, respectively. It is located and does not oppose the slurry inlet part 32 and the slurry outlet part 33.

  That is, in the valve open position, the first valve seat 35 and the second valve seat 36 are not closed by the valve body 40, and the slurry inlet portion 32 and the slurry outlet portion 33 communicate with each other via the flow path connection chamber 34. It is like that. When the fine particle-containing slurry is supplied from the slurry supply device 10 in this state, the fine particle-containing slurry in the slurry control valve 30 is pushed out and supplied to the slurry spraying device 50. That is, the fine particle-containing slurry is supplied from the slurry supply device 10 to the slurry spraying device 50 via the slurry control valve 30.

  When the control device 3 moves the rod 38a of the cylinder 38 downward from the state shown in FIG. 6A, first, as shown in FIG. 6B, first, the first valve surface 41 of the valve body 40 is used. The second valve surface 42 contacts the first valve seat 35 and the second valve seat 36. In this state, the coil spring 49 is not sufficiently compressed, and the valve body 40 does not completely close the first valve seat 35 and the second valve seat 36.

  When the rod 38a of the cylinder 38 is further moved downward from the state shown in FIG. 6 (b) and is positioned at the lower (advance side) moving end position (front end position), the state shown in FIG. 6 (c) is obtained. As shown, the coil spring 49 provided between the step of the rod 38a and the spring seat 44 of the valve body 40 is further compressed by the compression amount ΔD, and the valve body 40 is moved to the first valve seat. 35 and the second valve seat 36 are elastically pressed against each other.

  In this state, communication between the slurry inlet portion 32 and the slurry outlet portion 33 is prevented by the valve body 40, and even if the fine particle-containing slurry is supplied from the slurry supply device 10, The slurry containing fine particles is not supplied to the slurry spraying device 50. That is, the valve body 40 is located at the valve closed position.

  Here, as described above, since the first and second valve seats 35 and 36 are inclined in the slurry supply direction toward the lower side, they are inclined with respect to the moving direction (vertical direction) of the valve body 40. Yes. That is, when the valve body 40 moves up and down, it does not slide on the first and second valve seats 35 and 36, so that the particulate matter is contained between the valve body 40 and the first and second valve seats 35 and 36. Slurry biting is suppressed. As a result, wear between the valve body 40 and the first and second valve seats 35 and 36 is also suppressed.

  Further, the valve body 40 is disposed in the flow path connection chamber 34 and is not opposed to the slurry inlet portion 32 and the slurry outlet portion 33 in the state where the valve body 40 is located at the valve open position. The flow path of the part 33 is not narrowed by the valve body 40, and it is easy to ensure the flow rate of the fine particle-containing slurry.

  Further, since the valve body 40 is biased downward by the coil spring 49, the impact when the valve body 40 is seated on the first and second valve seats 35, 36 can be reduced when the valve is closed. Thereby, the wear of the valve body 40 and the first and second valve seats 35 and 36 can be suppressed, and the durability of the slurry control valve 30 can be improved.

  Here, when the valve body 40 moves from the valve open position (upper side) to the valve closed position (lower side), the capacity of the upper chamber 34a increases while the capacity of the lower chamber 34b decreases. At this time, since the valve body 40 is formed with a pair of communication holes 47 communicating in the vertical direction, the slurry containing fine particles between the upper chamber 34a and the lower chamber 34b according to the movement of the valve body 40. Can be moved smoothly. That is, the valve body 40 can be quickly opened and closed.

  For example, when the valve body 40 is moved from the valve open position to the valve close position, the fine particle-containing slurry in the lower chamber 34 b can be moved to the upper chamber 34 a through the communication hole 47. Similarly, when the valve body 40 is moved from the valve closed position to the valve open position, the particulate-containing slurry in the upper chamber 34a can be moved to the lower chamber 34b through the communication hole. Therefore, the vertical movement of the valve body 40 is not hindered by the fine particle-containing slurry.

  Further, since the guide protrusion 46 is guided by the guide groove 37, the valve body 40 is restrained from swinging during movement between the valve open position and the valve close position. Furthermore, since the scraper groove 48 is formed in the valve body 40, the fine particle-containing slurry is prevented from biting into the guide groove 37.

[Slurry spraying equipment]
FIG. 7 is a longitudinal sectional view along the axis of the slurry spraying device 50. The slurry spray device 50 includes a main body casing 51, a spray unit 60 and a supply unit 52 configured inside the main body casing 51, and a nozzle expansion / contraction unit 70 configured on the rear side of the main body casing 51. The spray unit 60 atomizes the fine particle-containing slurry through the nozzle 68. The supply unit 52 supplies the fine particle-containing slurry to the spray unit 60. The nozzle enlargement / reduction unit 70 enlarges or reduces the opening area of the nozzle 68. In the following description, the direction (left side in the figure) in which the fine particle-containing slurry atomized from the slurry sprayer 50 is conveyed is referred to as the front, and the opposite direction (right side in the figure) is referred to as the rear.

(Main body casing)
The main body casing 51 is formed with a main body casing opening 53 penetrating in the front-rear direction in the inner diameter portion. A countersink hole 53 a is formed at the front end of the main casing opening 53. An adapter 58 is fixed to the counterbore hole 53a from the front side.

  The adapter 58 has a cylindrical portion 58 a protruding rearward on the rear surface, and the cylindrical portion 58 a is inserted into the counterbore hole portion 53 a of the main body casing 51 from the front side. Further, the adapter 58 has an adapter opening 59 penetrating in the front-rear direction on the inner diameter portion. The adapter opening 59 has a countersink hole 59a located at the front end and a spray guide hole 59b located at the rear end.

  The countersink hole 59a is formed by countersinking from the front. The spray guide hole portion 59b is formed in a linear shape having a rear end portion having a constant hole diameter, and is formed in a tapered shape having a diameter reduced from the middle portion in the front-rear direction to the front portion. It is formed so as to be smaller than the countersink diameter of the countersink hole 59a at the connection part with the countersink 59a.

(Spraying part)
The spray unit 60 includes a cylindrical coaxial nozzle 61 that extends in the front-rear direction and has a slit 62 at a front end, and a slit receiver 66 that engages the slit 62 in the radial direction and guides the forward and backward movement of the coaxial nozzle 61. Have.

  The coaxial nozzle 61 has a first cylindrical portion 61a, a second cylindrical portion 61b, and a third cylindrical portion 61c from the front. The outer diameter of each cylindrical part is first cylindrical part 61a <second cylindrical part 61b <third cylindrical part 61c. A spray medium passage 63 penetrating in the front-rear direction is formed in the inner diameter portion of the coaxial nozzle 61.

  A plurality of slits 62 are formed in the first cylindrical portion 61A. The plurality of slits 62 extend rearward along the axial direction from the front end portion, and penetrate in the radial direction so as to communicate with the spray medium passage 63 from the outer peripheral portion. The plurality of slits 62 are all formed in the same size and are equally arranged in the circumferential direction.

  The second cylindrical portion 61B is formed with a guide protrusion 64 that protrudes in the radial direction. FIG. 8 shows a cross-sectional view at the front position of the guide projection 64 of the slurry spraying device 50. As shown in FIG. 8, the guide protrusions 64 are formed in a rectangular shape so as to protrude in a pair in a radial direction.

  As shown in FIG. 7, the third cylindrical portion 61 </ b> C has a spray medium supply port 631 at the rear end. The spray medium supply port 631 has a front end communicating with the spray medium passage 63, and a spray medium (for example, compressed air or pressurized oxygen) is supplied from the spray medium supply means 7 to the rear end. . In the spray medium supply means 7, the supply amount and supply pressure of the spray medium are controlled by the control device 3. Further, a screw portion 65 is formed on the outer peripheral portion of the third cylindrical portion 61C.

  The slit receiver 66 is attached to a countersink hole 53 a formed in the main body casing opening 53, and is supported by the cylindrical portion 58 a of the adapter 58 on the front end surface. That is, the slit receiver 66 is clamped in the front-rear direction by the counterbore 53 a and the adapter 58 in the main body casing opening 53.

  The slit receiver 66 is a plate-like member and has a slit fitting opening 67 penetrating in the front-rear direction at the center. The slit fitting opening 67 is formed so as to be fitted on the slit 62 of the coaxial nozzle 61. FIG. 9 shows a sectional view of the slit receiver 66. As shown in FIG. 9, the slit fitting opening 67 includes a large-diameter portion 67a, a protruding portion 67b that protrudes radially inward from the large-diameter portion 67a, and a small-diameter portion that is an end surface portion on the radially inner side of the protruding portion 67b. 67c.

  The large diameter portion 67a is formed in a size that substantially matches the outer diameter of the first cylindrical portion 61A in which the slit 62 is formed. The small diameter portion 67 c is formed in a size that substantially matches the passage diameter of the spray medium passage 63. Further, the size of the protruding portion 63 b is set so that the protruding portion 63 b substantially matches the circumferential dimension of the slit 62 when the coaxial nozzle 61 is assembled to the slit fitting opening 67.

  As shown in an enlarged view in FIG. 7, when the coaxial nozzle 61 is assembled to the slit receiver 66, a plurality of nozzles 68 are formed by non-fitting portions of the slit 62 with the protruding portion 67 b. The plurality of nozzles 68 communicate with the spray medium passage 63 from the outer peripheral portion of the coaxial nozzle 61. The plurality of nozzles 68 are arranged at equal intervals in the radial direction, and are configured to have the same size.

  Further, since the protruding portion 67 b can be fitted into the slit 62, the coaxial nozzle 61 can be moved forward and backward in the axial direction with respect to the slit receiver 66. As a result, when the coaxial nozzle 61 moves rearward, the axial length H of the nozzle 68 increases and the opening area of the nozzle 68 increases. Conversely, when the coaxial nozzle 61 moves forward, the axial length of the nozzle 68 is increased. H decreases and the opening area of the nozzle 68 decreases.

  Further, the spray unit 60 further includes a porous nozzle 69 on the front side of the slit receiver 66 in order to make the spray diameter more uniform according to the material of the slurry. The perforated nozzle 69 is disposed in the vicinity of the slit receiver 66 and is a circular plate-like member, and is disposed in a state where the axis is aligned with the coaxial nozzle 61. The multi-hole nozzle 69 is attached to a countersink hole 59a of the adapter opening 59, and is supported from the front by a cylindrical portion 84a of an inner tube holder 84 described later. Accordingly, the multi-hole nozzle 69 is sandwiched in the front-rear direction by the counterbore 59 a and the inner tube holder 84 in the adapter opening 59.

  FIG. 10 shows a cross-sectional view of the porous nozzle 69 of the slurry spraying device 50. As shown in FIG. 10, the multi-hole nozzle 69 has a plurality of through holes 69 a penetrating in the front-rear direction. The plurality of through holes 69a are formed to have a small diameter so as to be located in a region (indicated by a two-dot chain line) where the passage diameter of the spray medium passage 63 is projected, and each hole diameter is, for example, 1 mm or less, more preferably 0. .7mm.

(Supply section)
As shown in FIG. 7, the supply unit 52 is configured in a main body casing 51. The opening diameter of the main casing opening 53 is larger than the first cylindrical portion 61A and the second cylindrical portion 61B of the coaxial nozzle 61. The main body casing 51 is formed with a communication hole 54 penetrating the outer peripheral portion and the main body casing opening 53 in the radial direction.

  Between the main body casing opening 53 and the first cylindrical portion 61A and the second cylindrical portion 61B of the coaxial nozzle 61, a slurry accommodating portion 55 is configured. The slurry container 55 has a front end defined by a rear end surface of the slit receiver 66 and a rear end disposed between the second cylindrical portion 61B and the main body casing opening 53 and a dust seal 56 and a dust seal. 57.

  The second slurry supply pipe 6 is connected to the communication hole 54. That is, the slurry containing part 55 is supplied with the fine particle-containing slurry from the slurry control valve 30 via the second slurry supply pipe 6.

(Nozzle expansion / contraction part)
The nozzle expansion / contraction part 70 is fixed to the rear side of the housing 73, a holder 71 fixed to the rear side of the main body casing 51, a housing 73 rotatably disposed on the holder 71 via a cross roller bearing 72, and And an adjustment nut 74.

  The holder 71 is formed with an insertion hole 71a through which the second cylindrical portion 61B of the coaxial nozzle 61 is inserted on the radially inner side. As shown in FIG. 8, a pair of guide grooves 71b are formed in the insertion hole 71a in the radial direction. A pair of guide protrusions 64 of the coaxial nozzle 61 are positioned inside the guide groove 71b. Each groove wall surface of the guide groove 71b is opposed to each wall surface of the guide protrusion 64 or through a minute gap.

  As shown in FIG. 7, the adjustment nut 74 has a screw hole 74a penetrating in the front-rear direction on the radially inner side. The screw hole 74 a is screwed into a screw portion 65 formed in the third cylindrical portion 61 </ b> C of the coaxial nozzle 61. That is, when the adjustment nut 74 is rotated with respect to the holder 71 together with the housing 73, the coaxial nozzle 61 follows the lead of the screw portion 65 without rotating because the guide protrusion 64 is restricted by the guide groove 71 b of the holder 71. , Move forward or backward with respect to the holder 71.

  Therefore, by rotating the adjustment nut 74, the coaxial nozzle 61 can be moved forward and backward. As a result, the axial length of the nozzle 68 formed by the slit 62 and the slit receiver 66 of the coaxial nozzle 61 increases or decreases, and the opening area of the nozzle 68 is enlarged or reduced.

(Operation of slurry spraying device)
In the slurry spraying device 50 described above, when the slurry containing part 55 is filled with the particulate containing slurry, and further the particulate containing slurry is supplied through the communication hole 54, the particulate containing slurry in the slurry containing part 55 is supplied. Is pushed through the plurality of nozzles 68 and into the spray medium passage 63.

  In the spray medium passage 63, a spray medium, for example, compressed air and pressurized oxygen are supplied from the spray medium supply means 7, and the fine particle-containing slurry pushed into the spray medium passage 63 is sheared by the compressed air. In response to fluidization, and further subjected to shearing force by the spray medium to be atomized. At this time, since the plurality of nozzles 68 are formed at equal intervals in the circumferential direction, the fine particle-containing slurry is evenly pushed out on the inner circumference of the spray medium passage 63. Thereby, spraying of the fine particle-containing slurry is made uniform.

  Further, the nozzle expansion / reduction unit 70 enlarges / reduces the opening area of the plurality of nozzles 68 to control the amount of the fine particle-containing slurry pushed out into the spray medium passage 63, thereby generating a spray having a desired spray diameter. be able to.

  A plurality of through holes 69a are formed in the porous nozzle 69, and the atomized fine particle-containing slurry passes through the through holes 69a and further flows downstream. Here, the atomized fine particle-containing slurry flows to the downstream side only when the spray diameter is smaller than the hole diameter of the through hole 69a. In other words, the passage of the perforated nozzle 69 prevents a spray larger than the diameter of the through hole 69a from flowing downstream.

  That is, the perforated nozzle 69 plays a role of a sieve for selecting a spray having a predetermined diameter or less from the spray of the fine particle-containing slurry. For example, even when a spray having an undesirably large spray diameter is generated from the nozzle 68, the spray having a large spray diameter is prevented from being supplied to the downstream side by the porous nozzle 69. Further, since the porous nozzle 69 can be easily attached and detached by removing the inner tube holder 84, the porous nozzle 69 can be easily replaced with a suitably set porous nozzle 69 in accordance with a desired particle diameter.

[Slurry transfer pipe]
As shown in FIG. 7, the slurry transport pipe 80 is attached to the front side of the slurry spraying device 50. The slurry transfer pipe 80 includes an inner pipe 81, an outer pipe 82 disposed on the outer peripheral side with a space therebetween, and a cooling medium supply unit 90 that supplies a cooling medium between the inner pipe 81 and the outer pipe 82. Have.

  That is, the slurry transport pipe 80 is configured as a double pipe by the inner pipe 81 and the outer pipe 82 and is cooled by a cooling medium supplied between these pipes. Further, the slurry transport pipe 80 further includes an inner pipe holder 84 attached to the front end portion of the slurry spraying device 50.

(Inner tube holder)
The inner tube holder 84 supports the rear end portion of the inner tube 81. The inner tube holder 84 has a cylindrical portion 84a protruding rearward at the rear end portion, and an inner tube holder opening 85 penetrating in the front-rear direction on the inner diameter portion. The inner tube holder opening 85 includes a counterbore hole 85a positioned at the front end, a chamfered portion 85b positioned at the rear end, and an inner tube support portion positioned between the counterbore hole 85a and the chamfer 85b. 85c.

  The countersink hole 85a is formed by countersinking from the front. The chamfered portion 85b is formed such that the rear end portion has a hole diameter (chamfered diameter) including a plurality of through holes 69a formed in the porous nozzle 69 in a front view, and the front end portion has a hole diameter (chamfered diameter). The inner tube support portion 85c is formed to have a size that substantially matches the inner diameter of the inner tube 81. The inner diameter of the inner tube support portion 85 c is formed to a size that substantially matches the outer diameter of the inner tube 81.

(Inner pipe)
The inner tube 81 is a tubular member extending in the front-rear direction. The inner pipe 81 is inserted and supported from the front side to the inner pipe support part 85c of the inner pipe holder 84 at the rear end part, and is located at a position close to the downstream side (front side) of the porous nozzle 69 via the chamfered part 85b. Is arranged. As shown in FIG. 12, the front end portion of the inner pipe 81 is located at a position close to the upstream side (rear side) of the combustion chamber 105 of the slurry spraying apparatus 100.

(Outer pipe)
As shown in FIG. 7, the outer tube 82 is a tubular member extending in the front-rear direction and has an outer diameter larger than that of the inner tube 81. More specifically, the inner diameter of the outer tube 82 is larger than the outer diameter of the inner tube 81, and the inner tube 81 is disposed at a distance from the inner diameter side of the outer tube 82. The outer tube 82 is located in front of the rear end portion of the inner tube 81. As shown in FIG. 10, the outer tube 82 is located behind the front end of the inner tube 81. That is, the outer tube 82 is shorter than the inner tube 81.

(Cooling medium supply unit)
As shown in FIG. 7, the cooling medium supply unit 90 includes a cooling nozzle 91 and a cooling nozzle holder 95. The cooling nozzle 91 includes a substantially truncated cone-shaped nozzle main body 92 whose outer diameter decreases toward the front, a cylindrical portion 93 extending rearward at the rear end, and a nozzle opening 94 penetrating in the front-rear direction on the inner diameter side. And have.

  FIG. 11 is a cross-sectional view of the cooling medium supply unit 90 of the slurry transport pipe 80. As shown in FIG. 11, a plurality of groove portions 92 a extending in the front-rear direction along the outer peripheral surface are formed on the outer peripheral surface of the nozzle main body 92. The plurality of groove portions 92a are formed in the same size at equal intervals in the circumferential direction. As shown in FIG. 7, the cooling nozzle 91 is assembled such that the cylindrical portion 93 is inserted into the counterbore hole portion 85 a of the inner tube holder opening portion 85 from the front side. An inner tube 81 extends through the nozzle opening 94 in the front-rear direction.

  The cooling nozzle holder 95 is attached to the front side of the inner tube holder 84. The cooling nozzle holder 95 has a cooling nozzle holder opening 96 penetrating in the front-rear direction on the inner diameter portion. The cooling nozzle holder opening 96 has a countersink hole 96a located at the front end and a tapered hole 96b located at the rear end.

  The countersink hole 96a is formed by countersinking from the front. The tapered hole portion 96b is formed so that the hole diameter decreases toward the front, and the cooling nozzle 91 is assembled from the rear here. The tapered hole portion 96b has a rear end portion whose hole diameter is substantially equal to the outer diameter of the rear end portion of the nozzle main body portion 92, and the front end portion (connection portion with the counterbore hole portion 96a) has a hole diameter of the nozzle main body portion 92. Is smaller than the outer diameter of the front end portion and smaller than the hole diameter of the counterbore hole portion 96a.

  Further, the tapered hole portion 96b is longer than the nozzle body portion 92 in the front-rear direction. Furthermore, the inclination angle with respect to the front-rear direction of the hole wall surface of the taper hole portion 96 b coincides with the inclination angle with respect to the front-rear direction of the nozzle body portion 92. That is, the outer peripheral surface of the nozzle main body 92 is configured to substantially coincide with the hole wall surface of the tapered hole portion 96b in a state where the cooling nozzle 91 is assembled in the tapered hole portion 96b. In this state, a plurality of cooling medium paths extending in the front-rear direction are formed by the groove 92a between the nozzle main body 92 and the tapered hole 96b.

  Further, the cooling medium supply section 90 is a cooling medium introduction chamber 97 formed in an annular shape around the axial center so as to expand from the midway portion in the front-rear direction, more specifically, from the tapered hole portion 96b to the radially outer side. And a pair of communication holes 98 for communicating the cooling medium introduction chamber 97 with the outside.

(Operation of slurry transfer pipe)
Referring also to FIG. 11, the cooling medium is supplied to the communication hole 98 by the cooling medium supply means 8. The operation, supply amount, and / or supply pressure of the cooling medium supply means 8 are controlled by the control device 3.

  As shown in FIG. 7, the rear end portion of the outer tube 82 is supported by the counterbore hole portion 96 a of the cooling nozzle holder 95. Here, the outer tube 82 is located in front of the cooling nozzle 91, and the inner tube 81 and the outer tube 82 form a double tube on the front side of the cooling nozzle 91. A cooling medium path formed by a plurality of grooves 92 a formed between the outer peripheral surface of the nozzle main body 92 and the tapered hole portion 96 b is defined on the rear side of the outer tube 82 and on the outer peripheral side of the inner tube 81. It communicates with space.

  That is, the cooling medium supplied from the cooling medium supply means 8 is introduced into the cooling medium introduction chamber 97 through the pair of communication holes 98 and then communicates with the inside of the cooling medium introduction chamber 97 in the radial direction. It is guided radially inward through the plurality of grooves 92 a and reaches the outer peripheral side of the inner tube 81. Further, the cooling medium flows forward along the outer peripheral portion of the inner tube 81 and flows forward between the inner tube 81 and the outer tube 82.

  As shown in FIG. 12, the cooling medium flowing between the inner pipe 81 and the outer pipe 82 is discharged into the combustion chamber of the slurry spraying apparatus 100. For example, compressed air can be used as the cooling medium.

[Slurry spraying equipment]
12 shows a horizontal sectional view along the axis of the slurry spraying apparatus 100, and FIG. 13 shows a longitudinal sectional view of the slurry spraying apparatus 100 along the XIII-XIII line of FIG. 14 shows a rear view of the slurry spraying apparatus 100, and FIG. 15 shows a front view of the slurry spraying apparatus 100. As shown in FIG. 12, the slurry spraying apparatus 100 includes a holder 110, a casing 120, a gas nozzle 130, an air nozzle 140, an air cap 150, and a nozzle removing unit 160.

  In the following description, the spraying direction in which the gas flame is sprayed from the slurry spraying apparatus 100 is referred to as the front (left side in the figure) of the slurry spraying apparatus 100, and the reverse direction (right side in the figure) is referred to as the rear. In FIG. 12, the vertical direction is referred to as the horizontal direction of the slurry spraying apparatus 100, and in FIG. 13, the vertical direction is referred to as the vertical direction of the slurry spraying apparatus 100.

(holder)
As shown in FIGS. 12 and 13, the holder 110 is located at the rear end of the slurry spraying apparatus 100. The holder 110 constitutes an attachment base that supports other components and is attached to the robot arm 2. A holder opening 111 penetrating in the front-rear direction is formed at the center in the left-right direction and the up-down direction of the holder 110. A slurry conveying pipe 80 penetrates through the holder opening 111 in the front-rear direction. The holder opening 111 has a first holder hole 111a, a second holder hole 111b, and a third holder hole 111c in order from the front.

  The hole diameter of the first holder hole 111a is smaller than that of the second holder hole 111b, and the hole diameter of the second holder hole 112b is smaller than the hole diameter of the third holder hole 113c. That is, the holder opening 111 is formed as a stepped hole whose diameter increases sequentially from the first holder hole 111a toward the second and third holder holes 111b and 111c.

  As shown in FIG. 12, a holder right hole 112 and a holder left hole 113 extending in the front-rear direction are formed on the right and left sides of the holder opening 111. Further, as shown in FIG. 13, a holder upper hole 114 extending in the front-rear direction is formed on the upper side of the holder opening 111. The holder right hole 112, the holder left hole 113, and the holder upper hole 114 are blind holes that do not penetrate the holder 110 in the front-rear direction and open only at the front end of the holder 110.

  12 to 14, the holder 110 includes an oxygen supply port 115 to which combustion oxygen is supplied, a fuel supply port 116 to which fuel is supplied, and a scavenging medium supply to which a scavenging medium is supplied. And a mouth 117. For example, acetylene, propane, hydrogen, or ethylene can be used as the fuel, and compressed air can be used as the scavenging medium.

  The oxygen, fuel, and scavenging medium supplied to the holder 110 are supplied by the combustion gas supply means 9. In the combustion gas supply means 9, the supply amount and supply pressure of oxygen, fuel, and scavenging medium are controlled by the control device 3.

  In the rear view shown in FIG. 14, the oxygen supply port 115, the fuel supply port 116, and the scavenging medium supply port 117 are respectively formed on different side portions of the holder 110. Specifically, an oxygen supply port 115 is formed on the right side surface of the holder 110, a fuel supply port 116 is formed on the left side surface of the holder 110, and a scavenging medium supply port is formed on the upper surface of the holder 110. 117 is formed.

  As shown in FIG. 12, the oxygen supply port 115 extends to the left side and communicates with the holder right side hole 112. Similarly, the fuel supply port 116 extends to the right side and communicates with the holder left side hole 113. As shown in FIG. 13, the scavenging medium supply port 117 extends downward and communicates with the holder upper hole 114.

(casing)
As shown in FIGS. 12 and 13, the casing 120 extends forward from the front end surface of the holder 110, and has a first cylindrical portion 121, a second cylindrical portion 122, and a third cylindrical portion 123 from the front. ing. The outer diameter of each cylindrical portion is first cylindrical portion 121 <second cylindrical portion 122 <third cylindrical portion 123. The casing 120 is attached to the front end surface of the holder 110 by the third cylindrical portion 123. A screw part 122 a is formed on the outer peripheral part of the second cylindrical part 122.

  A casing opening 124 penetrating in the front-rear direction is formed at the radial center of the casing 120. The casing opening 124 has a first hole 124a, a second hole 124b, a third hole 124c, and a fourth hole 124d in order from the front, and the diameter of each of the holes gradually increases toward the rear. It is formed to shrink. That is, the hole diameter of the casing opening 124 is first hole 124a> second hole 124b> third hole 124c> fourth hole 124d.

  FIG. 17 is a cross-sectional view perpendicular to the axial direction of the slurry spraying apparatus 100 at the rear end portion of the first hole portion 124a. Referring also to FIG. 17, a right side expansion chamber 125 extended in an arc shape on the right side is continuously formed at the rear end portion of the first hole portion 124 a.

  FIG. 18 is a cross-sectional view perpendicular to the axial direction of the slurry spraying apparatus 100 at the rear end portion of the second hole portion 124b. Referring also to FIG. 18, a left-side expansion chamber 126 that is expanded in an arc shape on the left side is continuously formed at the rear end portion of the second hole portion 124 b. Further, an upper notch 122b that is notched substantially parallel to the left-right direction is formed on the outer peripheral portion of the second cylindrical portion 122 from the rear side of the upper portion.

  As shown in FIG. 12, the casing 120 has a casing right hole 127 and a casing left hole 128 extending in the front-rear direction on the right and left sides of the casing opening 124. The casing right hole 127 has a rear end opened to the rear end surface of the casing 120, and a front end communicated with the right expansion chamber 125. The casing left side hole 128 has a rear end opened to the rear end surface of the casing 120, and a front end communicated with the left expansion chamber 126.

  As shown in FIG. 13, the casing 120 further has a casing upper hole 129 extending in the front-rear direction above the casing opening 124. The casing upper hole 129 has a rear end opened to the rear end surface of the casing 120, and a front end communicated with the upper notch 122b.

  As shown in FIGS. 12 and 13, the casing 120 is attached to the holder 110, and the fourth hole portion 124 d is positioned corresponding to the first holder hole 111 a. The casing right hole 127 is positioned corresponding to the holder right hole 112, the casing left hole 128 is positioned corresponding to the holder left hole 113, and the casing upper hole 129 corresponds to the holder upper hole 114. Is located.

  More specifically, the sleeve 101 is interposed over the connecting portion between the casing right hole 127 and the holder right hole 112, so that the casing right hole 127 and the holder right hole 112 are concentrically formed. positioned. Similarly, a sleeve 101 is also provided at a connection portion between the casing left hole 128 and the holder left hole 113, and these are arranged concentrically with each other. Similarly, a sleeve 101 is also interposed at a connection portion between the casing upper hole 129 and the holder upper hole 114, and these are arranged concentrically with each other.

(Gas nozzle)
As shown in FIG. 12, the gas nozzle 130 extends in the front-rear direction, the front portion extends in front of the casing 120, and the rear portion is inserted into the casing opening 124 from the front. The front portion of the gas nozzle 130 extends forward in the shape of a truncated cone so that the outer diameter decreases toward the front. Further, a front end portion surface of the gas nozzle 130 is formed with a tip portion 130a that protrudes forward in the shape of a truncated cone at a central portion in the radial direction.

  As shown in FIG. 15, a plurality of inclined groove portions 130 b extending in the front-rear direction along the outer peripheral portion are formed on the outer peripheral portion of the front portion of the gas nozzle 130. The plurality of inclined groove portions 130b are formed in the same size at equal intervals in the circumferential direction. As shown in FIG. 12, the inclined groove portion 130 b is formed in a substantially front half of the outer peripheral portion of the front portion of the gas nozzle 130.

  The rear part of the gas nozzle 130 has a first cylindrical part 131, a second cylindrical part 132, and a third cylindrical part 133 in order from the front, and is formed so that the outer diameter gradually decreases toward the rear. Has been. That is, the outer diameter of the rear part of the gas nozzle 130 is first cylindrical part 131> second cylindrical part 132> third cylindrical part 133.

  The outer diameters of the first cylindrical portion 131, the second cylindrical portion 132, and the third cylindrical portion 133 are substantially equal to the diameters of the first hole portion 124a, the second hole portion 124b, and the third hole portion 124c of the casing 120, respectively. . An annular notch 131a is formed at a substantially central position in the front-rear direction in the outer peripheral portion of the first cylindrical portion 131 and is notched in the radial direction at a predetermined depth.

  Referring also to FIG. 17, a plurality of communication holes 131 b that extend forward and communicate with the notch 131 a are formed at the rear end portion of the first cylindrical portion 131. The plurality of communication holes 131b are formed so as to be arranged at substantially equal intervals in the circumferential direction.

  FIG. 16 is a cross-sectional view perpendicular to the axis of the slurry spraying apparatus 100 at the notch 131a. As shown in FIG. 16, a plurality of radial holes 131c extending radially inward are formed at equal intervals in the circumferential direction in the inner diameter portion of the notch 131a. Each of the plurality of radial holes 131c is formed to have substantially the same depth as a blind hole.

  As shown in FIG. 12, the gas nozzle 130 is assembled in the casing opening 124 from the front so that the rear end surface of the third cylindrical portion 133 is in contact with the bottom of the third hole 124 c of the casing 120. The rear end portion of the two cylindrical portions 132 is positioned away from the hole bottom of the second hole portion 124b. More specifically, the rear end portion of the second cylindrical portion 132 substantially coincides with the front end surface of the left extension chamber 126 in the front-rear direction.

  That is, referring to FIG. 18 as well, an annular first space 134 is provided around the third cylindrical portion 133 and between the rear end surface of the second cylindrical portion 132 and the bottom of the second hole portion 124b. Is defined. The first space 134 communicates with the left extension chamber 126.

  As shown in FIG. 12, the rear end portion of the first cylindrical portion 131 is positioned away from the hole bottom of the first hole portion 124a. More specifically, the rear end portion of the first cylindrical portion 131 substantially coincides with the front end surface of the right expansion chamber 125 in the front-rear direction. That is, referring also to FIG. 17, between the rear end surface of the first cylindrical portion 131 and the bottom of the first hole portion 124a around the second cylindrical portion 132, an annular second space 135 is formed. Is defined. The second space 135 communicates with the right expansion chamber 125.

  A gas nozzle opening 136 penetrating in the front-rear direction is formed at the radial center of the gas nozzle 130. The gas nozzle opening 136 has a first hole 136a, a second hole 136b, and a third hole 136c in order from the front, and is formed such that the hole diameter gradually increases toward the rear. ing. That is, the hole diameter of the gas nozzle opening 136 is first hole 136a <second hole 136b <third hole 136c.

  The front end portion of the inner tube 81 of the slurry carrying tube 80 is located on the inner diameter side of the first hole 136a. The inner tube 81 is supported in the radial direction via the inner tube support ring 102 at the front end portion of the second hole 136b. The inner tube support ring 102 includes support portions extending inward in the radial direction at four locations, upper, lower, left and right, and the inner tube 81 is supported by the support portions. The outer tube 82 of the slurry transport tube 80 is supported in the radial direction by the rear portion of the inner tube support ring 102 of the second hole 136b. An internal thread portion 136d is formed in the third hole portion 136c.

  The gas nozzle 130 has a plurality of inclined hole portions 137 extending inclined inward in the radial direction toward the front around the gas nozzle opening 136. The inclined hole portion 137 includes a first inclined hole 137 a that communicates with the second space 135 and a second inclined hole 137 b that communicates with the first space 134.

  The first inclined hole 137a extends forward from the bottom side portion of the radial hole 131c to the front end surface of the gas nozzle 130, and is inclined radially inward with respect to the central axis of the gas nozzle 130 at an inclination angle θ1. . The second inclined hole 137b extends forward from the rear end surface of the second cylindrical portion 132 to the front end surface of the gas nozzle 130, and is inclined radially inward with respect to the central axis of the gas nozzle 130 at an inclination angle θ2.

  As shown in FIG. 16, the plurality of first inclined holes 137a are formed so as to communicate with the plurality of radial holes 131c, respectively, and the plurality of second inclined holes 137b are respectively connected to the plurality of radial holes 131c. It is formed between. In other words, the plurality of first inclined holes 137a and second inclined holes 137b are provided so as to be alternately arranged in the circumferential direction.

  Further, as shown in FIG. 15, in the front end surface of the gas nozzle 130, the plurality of first inclined holes 137 a and second inclined holes 137 b are alternately arranged on the same circumference at the outer peripheral side of the tip end portion 130 a. Yes. Furthermore, the inclination angle θ1 of the first inclined hole 137a and the inclination angle θ2 of the second inclined hole 137b are the same angle, for example, set to 3 °. The plurality of first inclined holes 137a and second inclined holes 137b are located with respect to the central axis of the gas nozzle 130 so as to correspond to the radially inner side of the inclined groove portion 130b formed in the outer peripheral portion of the front portion of the gas nozzle 130. Are formed at the same angular position.

(Air nozzle)
As shown in FIG. 12, the air nozzle 140 is configured to be hollow so as to cover the front portion of the gas nozzle 130 from the outer peripheral side and to define a combustion chamber 105 on the front side of the gas nozzle 130 in this inner space. The air nozzle 140 extends in a truncated cone shape so that the outer diameter decreases toward the front, and includes a rear flange 141 at the rear end. The air nozzle 140 is attached across the front end surface of the casing 120 and the front end surface of the first cylindrical portion 131 of the gas nozzle 130 via the rear flange 141.

  An air nozzle opening 142 penetrating in the front-rear direction is formed at the radial center of the air nozzle 140. The air nozzle opening 142 has a first hole 142a, a second hole 142b, and a third hole 142c in order from the front.

  The first hole 142a is formed as a straight hole having the same diameter and extending in the front-rear direction. The second hole portion 142b is formed as a tapered hole whose diameter decreases toward the front, and the outer peripheral portion of the front portion of the gas nozzle 130 is substantially in contact with the hole wall surface. The third hole 142c is formed as a tapered hole whose diameter decreases toward the front, and the wall surface of the hole is located on the outer diameter side at a substantially constant interval with respect to the outer periphery of the front part of the gas nozzle 130. ing.

  That is, in the air nozzle opening 142, the first hole 142a and the portion of the second hole 142b located on the front side of the gas nozzle 130 define the combustion chamber 105 on the inside thereof. The combustion chamber 105 has a diameter that decreases from the second hole portion 142b toward the first hole portion 142a, and the first hole portion 142a that is positioned at the front end portion is configured as a throttle portion of the combustion chamber 105. Yes. In addition, a cylindrical third space 143 is formed between the second hole 142b and the gas nozzle 130 in a radial direction so as to incline radially inward toward the front.

  On the rear end surface of the rear flange 141, a plurality of grooves 141a that are concave toward the front are formed. Each of the plurality of groove portions 141a extends in the radial direction, and communicates the outer diameter portion of the rear flange 141 and the air nozzle opening 142 in the radial direction.

(Air cap)
The air cap 150 is configured so as to cover the outer periphery of the casing 120 from the front, and is formed on the rear side of the first cylindrical portion 151 located on the outer peripheral side of the first cylindrical portion 121 of the casing 120. A second cylindrical portion 152 positioned on the outer peripheral side of the second cylindrical portion 122 of the cage casing 120 and a front flange formed on the front side of the first cylindrical portion 151 and positioned in front of the first cylindrical portion 121 of the casing 120. 153.

  That is, a fourth space 154 is formed between the air cap 150 and the casing 120 and extends forward in a cylindrical shape and extends radially inward on the rear surface of the front flange 153.

  The first cylindrical portion 151 is located away from the first cylindrical portion 121 of the casing 120 on the outer diameter side through a space. A female screw portion 152 a is formed on the inner diameter portion of the second cylindrical portion 152. The female screw portion 152 a is screwed into the screw portion 122 a of the second cylindrical portion 122 of the casing 120.

  The front flange 153 has a flange hole 153a penetrating in the front-rear direction at the radial center. A proximal end portion adjacent to the rear flange 141 of the air nozzle 140 is fitted into the flange hole 153a. Further, the front flange 153 is in contact with the front end surface of the rear flange 141 of the air nozzle 140.

  That is, the air cap 150 is screwed into the screw portion 122a of the casing 120 by the female screw portion 152a of the second cylindrical portion 152, and the front flange 153 is connected to the air nozzle 140 and the rear flange 141 is connected to the casing 120 and The gas nozzle 130 is held by being pressed toward the front end surface of the first cylindrical portion 131.

(Nozzle removal part)
As shown in FIG. 12, the nozzle removing unit 160 has a nozzle removing bolt 161, a bush 164, and an O-ring presser 165. The nozzle removing bolt 161 has a bolt head 162 positioned at the rear end portion and a bolt shaft portion 163 extending forward.

  On the outer periphery of the bolt head 162, an annular groove 162a is formed at a substantially central portion in the front-rear direction. The width dimension in the front-rear direction of the groove 162a substantially matches the dimension in the front-rear direction of the third holder hole 111c. Referring also to FIG. 14, the bolt head 162 has a rear portion of the groove 162 a formed in a hexagonal shape in rear view.

  As shown in FIG. 12, the bolt shaft portion 163 includes a first shaft portion 163 a located in the holder opening 111 of the holder 110, and a second shaft portion 163 b extending forward adjacent to the front side. Yes. The second shaft portion 163b has an outer diameter smaller than that of the first shaft portion 163a and is formed with a screw portion 163c. The threaded portion 163c is screwed into a female threaded portion 136d formed in the third hole 136c of the gas nozzle 130.

  Referring also to FIG. 14, the bush 164 is divided into two in the radial direction, and a bush hole 164 a is formed in the central portion in the radial direction. The bush hole portion 164a is formed in a size that substantially matches the groove bottom diameter at the groove bottom of the groove portion 162a of the bolt head portion 162. Further, the width dimension in the front-rear direction of the bush 164 is formed so as to substantially match the width dimension in the front-rear direction of the groove 162 a of the bolt head 162.

  The bush 164 is divided in the radial direction, and a pair of halved bush hole portions 164a is engaged with the groove portion 162a of the bolt head portion 162 in the radial direction. Is attached. Thus, the nozzle removal bolt 161 is positioned in the front-rear direction. At this time, the rear end surface of the bush 164 is positioned substantially flush with the rear end surface of the holder 110.

  In addition, a bolt opening 166 penetrating in the front-rear direction is formed in the central portion of the nozzle removal bolt 161 in the radial direction. The bolt opening 166 has a countersink hole 166a formed at the rear end, and a through-hole 166b extending forward from the front end surface of the countersink hole 166a. The slurry transport pipe 80 penetrates through the through-hole portion 166b in the front-rear direction. Moreover, the internal thread part 166c is formed in the hole wall surface of the counterbore hole part 166a.

  In addition, an O-ring 103 that seals the space defined between the slurry transport pipe 80 and the through-hole portion 166b from the rear is disposed at the groove bottom of the counterbore hole portion 166a.

  The O-ring retainer 165 has a bolt head 165a located at the rear end portion and a bolt shaft portion 165b extending forward. The bolt head 165a is formed in a hexagonal shape in the rear view shown in FIG. The bolt shaft portion 165b has a screw portion 165c formed on the outer periphery. In addition, an O-ring pressing opening 167 penetrating in the front-rear direction is formed at a central portion in the radial direction of the O-ring pressing 165. The slurry transport pipe 80 penetrates through the O-ring pressing opening 167 in the front-rear direction.

  The O-ring presser 165 is assembled to the counterbore hole 166a of the bolt head 162 by screwing the screw part 165c with the female screw part 166c. In a state where the O-ring presser 165 is assembled to the countersink hole 166a, the O-ring 103 seals the outer peripheral part of the slurry transport pipe 80, while the groove bottom surface of the countersink hole 166a and the O-ring presser 165 It is sandwiched between the front end face.

  In the slurry spraying apparatus 100 described above, an oxygen supply path, a fuel supply path, and a compressed air supply path are formed in which oxygen, fuel, and compressed air introduced into the holder 110 are individually introduced into the combustion chamber 105. Has been.

(Oxygen supply route)
As shown in FIG. 12, the oxygen supply path includes an oxygen supply port 115 and a holder right hole 112 of the holder 110, a sleeve 101, a casing right hole 127 and a right expansion chamber 125 of the casing 120, a second space 135, The gas nozzle 130 includes at least a communication hole 131b, a notch 131a, a radial hole 131c, and a first inclined hole 137a. That is, oxygen introduced into the oxygen supply path is supplied radially inward from the first inclined hole 137a to the combustion chamber 105 at an inclination angle θ1 toward the front.

(Fuel supply route)
The fuel supply path includes a fuel supply port 116 and a holder left hole 113 of the holder 110, a sleeve 101, a casing right hole 128 and a left expansion chamber 126 of the casing 120, a first space 134, and a second inclined hole of the gas nozzle 130. 137b. That is, the fuel (for example, acetylene) introduced into the fuel supply path is supplied radially inward from the second inclined hole 137b to the combustion chamber 105 at an inclination angle θ2.

(Scavenging medium supply passage)
As shown in FIG. 13, the scavenging medium supply path includes the holder 110 scavenging medium supply port 117 and the holder upper hole 114, the sleeve 101, the casing upper hole 129 and the upper notch 122 b of the casing 120, and the fourth space 154. The groove portion 141 a of the air nozzle 140, the third space 143, and the inclined groove portion 130 b of the gas nozzle 130 are at least configured. The scavenging medium introduced into the scavenging medium supply path is discharged from the inclined groove 130b of the gas nozzle 130 toward the combustion chamber 105 along the inner peripheral wall surface of the second hole 142b of the air nozzle 140.

[Operation and effect of spraying system]
In the thermal spraying system 1 described above, the control device 3 controls the operations of the slurry supply device 10, the slurry control valve 30, the slurry spraying device 50, the slurry conveying pipe 80, and the slurry thermal spraying device 100, thereby fine particles. Is sprayed toward a desired position of the material to be sprayed W.

  The control device 3 controls the drive unit 20 of the slurry supply device 10 so that the fine particle-containing slurry is pushed out of the syringe 11 and supplied to the slurry control valve 30 via the first slurry supply pipe 5. It has become. At this time, the control device 3 controls the opening and closing of the slurry control valve 30 based on the pressure of the fine particle-containing slurry pushed out from the syringe 11 detected by the pressure sensor 28 of the slurry supply device 10.

  Specifically, the control device 3 controls the cylinder 38 so that the valve body 40 is positioned at the valve closed position until the pressure value of the fine particle-containing slurry detected by the pressure sensor 28 becomes equal to or higher than a predetermined pressure.

  When the pressure of the fine particle-containing slurry detected by the pressure sensor 28 exceeds a predetermined pressure, the control device 3 controls the cylinder 38 of the slurry control valve 30 to move the valve body 40 to the valve open position. . As a result, the fine particle-containing slurry that has become a predetermined pressure or higher is supplied to the slurry spraying device 50.

  The fine particle-containing slurry supplied to the slurry spraying device 50 is pushed out from the nozzle 68 of the spraying unit 60 to the spraying medium passage 63 on the inner diameter side of the coaxial nozzle 61. The spray medium passage 63 is supplied with compressed air as a spray medium from the spray medium supply means 7. The control device 3 controls the spray medium supply means 7 to control the pressure of the compressed air supplied to the spray medium passage 63 to a predetermined pressure.

  Here, the predetermined pressure set to the compressed air is lower than the predetermined pressure set to the fine particle-containing slurry. Thus, the fine particle-containing slurry can be pushed out from the nozzle 68 to the spray medium passage 63 against the pressure of the compressed air.

  The fine particle-containing slurry pushed out to the spray medium passage 63 is atomized by the spray medium. The spray of the fine particle-containing slurry passes through the porous nozzle 69, and a spray smaller than the through hole 69 a formed here is supplied to the slurry transport pipe 80.

  In the slurry spraying device 50, the nozzle 68 is adjusted in advance so as to have a desired opening area by operating the nozzle expansion / contraction part 70. Thereby, the fine particle-containing slurry can be atomized to a desired particle size. For example, the spray diameter of the fine particles may be controlled in accordance with the properties of the fine particles to be sprayed or the properties of the sprayed coating.

  FIG. 19 schematically shows the operation of the slurry spraying apparatus 100. As shown in FIG. 19, the spray of the fine particle-containing slurry is discharged into the combustion chamber 105 of the slurry spraying apparatus 100 through the inner pipe 81 of the slurry transport pipe 80. In the slurry spraying apparatus 100, oxygen, acetylene as a fuel, and the like are individually supplied from the first inclined hole 137a and the second inclined hole 137b of the gas nozzle 130, which are coaxially disposed around the slurry conveying pipe 80. Is done.

  Since the first inclined hole 137 a and the second inclined hole 137 b are inclined radially inward toward the combustion chamber 105, oxygen, acetylene, and the like are mixed at a position spaced forward from the gas nozzle 130. A gas flame is generated. As a result, heat input from the gas frame to the gas nozzle 130 is suppressed, and therefore, a temperature rise of the slurry transport pipe 80 disposed coaxially with the gas nozzle 130 is suppressed. Therefore, sticking of the fine particles in the slurry transport pipe 80 is suppressed.

  Furthermore, the first inclined holes 137a for supplying oxygen to the combustion chamber 105 and the second inclined holes 137b for supplying acetylene or the like are alternately arranged on the same circumference, and the central axis at the outlet opening Are inclined at substantially the same angle radially inward toward the combustion chamber 105.

  As a result, while supplying oxygen and acetylene or the like to the combustion chamber 105 by separate systems, a mixed gas in which these are mixed substantially uniformly can be obtained, and a gas flame having a good combustion state can be obtained. In addition, since the gas frame is generated on the axis of the slurry transport pipe 80, a thermal fluid containing the particulate-containing slurry substantially uniformly is obtained. As a result, a sprayed coating in which the fine particles are sprayed substantially uniformly is obtained.

  From the rear of the gas frame, the spray of the fine particle-containing slurry is introduced from the slurry transport pipe 80 arranged coaxially thereto. In the gas flame, the organic solvent disappears from the fine particle-containing slurry, and the fine particles are sprayed onto the sprayed material.

  Here, the slurry conveying pipe 80 is configured as a double pipe having an inner pipe 81 and an outer pipe 82, and compressed air as a cooling medium is cooled between the inner pipe 81 and the outer pipe 82. Supplied from the medium supply means 8. As a result, the temperature rise of the slurry transport pipe 80 is suppressed, so that the fine particles are prevented from adhering to the inner wall surface of the inner pipe 81 of the slurry transport pipe 80 by heat.

  The compressed air supplied between the inner tube 81 and the outer tube 82 is introduced into the combustion chamber 105 from the outer peripheral portion at the front end portion of the inner tube 81. As a result, when the fine particle-containing slurry is introduced from the inner pipe 81 into the combustion chamber 105, it is suppressed that the fine particle-containing slurry adheres to the front edge and hangs down. Therefore, adhesion of fine particles at the outlet end portion of the slurry transport pipe 80 can be suppressed.

  In addition, compressed air as a scavenging medium is supplied to the outer peripheral portion of the combustion chamber 105 via a scavenging medium supply path. Thereby, the inner peripheral wall surface of the air nozzle 140 can be scavenged, and adhesion of the fine particles supplied to the combustion chamber 105 to the wall surface is suppressed.

  Moreover, in the gas nozzle 130, the plurality of inclined groove portions 130b from which the compressed air is discharged are respectively radially outward with respect to the plurality of first inclined holes 137a and second inclined holes 137b that open to the inner side in the radial direction. Correspondingly located. Therefore, oxygen, acetylene, and the like supplied from the first inclined hole 137a and the second inclined hole 137b to the combustion chamber 105 are prevented from reaching the inner peripheral wall surface of the air nozzle 140, so that the gas flame is radially inward of the combustion chamber 105. Easy to guide to.

  As a result, the fine particle-containing slurry introduced into the gas frame can be effectively prevented from adhering to the inner peripheral wall surface of the air nozzle 140.

  Furthermore, since the air nozzle 140 that defines the combustion chamber 105 is formed with a first hole 142a as a flow restrictor at the front end, spraying of the fine particle-containing slurry introduced into the combustion chamber 105 due to the venturi effect and The gas frame into which the spray is introduced can be easily discharged toward the front side of the first hole 142a. Thereby, the adhesion of fine particles on the inner peripheral wall surface of the air nozzle 140 is further suppressed.

[Removal of gas nozzle]
Next, attachment / detachment of the gas nozzle 130 from the casing 120 will be described. An O-ring 103 is appropriately provided between the holder 110, the casing 120, and the gas nozzle 130, and the oxygen supply path, the fuel supply path, and the scavenging medium supply path that are configured in these are sealed.

  Specifically, an O-ring 103 is disposed on the outer peripheral side of the sleeve 101 at the joint between the holder 110 and the casing 120. Further, regarding the joint between the casing 120 and the gas nozzle 130, the third hole 124c and the third cylindrical part 133, the second hole 124b and the second cylindrical part 132, the first hole 124a and the first cylinder. An O-ring 103 is disposed between the portions 131 on the casing 120 side. In the first hole portion 124a and the first cylindrical portion 131, two O-rings 103 are disposed before and after the notch portion 131a.

  Accordingly, four O-rings 103 are arranged between the gas nozzle 130 and the casing opening 124. For this reason, the gas nozzle 130 is difficult to remove because it receives a pressing force inward in the radial direction by the O-ring 103 with respect to the casing opening 124.

  Here, the slurry spraying apparatus 100 according to the present embodiment includes a nozzle removing unit 160. By rotating the nozzle removing bolt 161 with respect to the holder 110, the gas nozzle 130 screwed into the threaded portion 165c of the bolt shaft portion 165b of the nozzle removing bolt 161 is connected to the female threaded portion 136d formed at the rear end portion thereof. According to the lead, it can be separated from the nozzle removal bolt 161.

  At this time, the position of the nozzle removal bolt 161 in the front-rear direction is defined by the bush 164 and is configured so as not to move in the front-rear direction with respect to the holder 110. Therefore, the gas nozzle 130 can be easily removed from the casing opening 124 by rotating the nozzle removal bolt 161 and pushing the gas nozzle 130 forward to a position where the tightening force by the O-ring 103 is eliminated or reduced. It is like that.

  In the above embodiment, the fine particle-containing slurry has been described as an example of the thermal spray material. However, the fine particles may contain nanoparticles. As the fine particle-containing slurry, for example, a nanoparticle-containing slurry in which only nanoparticles are dispersed in an organic solvent may be employed. In the nanoparticle-containing slurry that is not easily transported in the pipe, the effects of the present invention are more suitably exhibited.

  According to the fine particle-containing slurry spraying apparatus and the thermal spraying system including the thermal spraying apparatus according to the present invention, when the fine particle-containing slurry is introduced into the gas frame through the slurry conveying pipe, the slurry is conveyed while being distributed substantially uniformly. Since the stenosis of the tube can be suppressed, the industrial utility value is great.

DESCRIPTION OF SYMBOLS 1 Thermal spraying system 3 Control apparatus 7 Spray medium supply means 8 Cooling medium supply means 10 Slurry supply apparatus 11 Syringe 14 Plunger 16 Pusher rod 20 Drive part 28 Pressure sensor 30 Slurry control valve 31 Main body casing 32 Slurry inlet part 33 Slurry outlet part 34 Flow Road connection chamber 35 First valve seat 36 Second valve seat 38 Cylinder 40 Valve body 41 First valve surface 42 Second valve surface 49 Coil spring 50 Slurry spray device 51 Main body casing 52 Supply portion 55 Slurry storage portion 60 Spray portion 61 Coaxial Nozzle 62 Slit 63 Spray medium passage 68 Nozzle 70 Nozzle expansion / contraction part 80 Slurry transport pipe 81 Inner pipe 82 Outer pipe 84 Inner pipe holder 90 Cooling medium supply part 100 Slurry spraying apparatus 105 Combustion chamber 110 Holder 115 Containing feed port 116 fuel supply port 117 scavenging medium supply port 120 casing 130 gas nozzles 140 air nozzles 150 air cap 160 nozzle removal unit 161 nozzles removable bolts

Claims (14)

A combustion chamber producing a gas flame in which oxygen and fuel are burned;
A gas nozzle for supplying the oxygen and the fuel to the combustion chamber;
A slurry conveying pipe that is coaxially disposed on the inner diameter side of the gas nozzle and conveys the fine particle-containing slurry to the gas frame as a thermal spray material,
A fine particle-containing slurry spraying apparatus that sprays with a thermal fluid in which the fine particle-containing slurry is introduced into the gas frame,
The slurry transport pipe is a double pipe having an inner pipe through which the fine particle-containing slurry flows and an outer pipe arranged at an interval on the outer peripheral side, and is cooled between the inner pipe and the outer pipe. A fine particle-containing slurry spraying apparatus in which a medium is supplied. The slurry conveying pipe is configured such that the cooling medium is discharged toward the combustion chamber from between the inner pipe and the outer pipe.
The fine particle-containing slurry spraying apparatus according to claim 1. The gas nozzle is
An oxygen supply path for supplying the oxygen to the combustion chamber;
A fuel supply path for supplying the fuel to the combustion chamber,
The oxygen supply path and the fuel supply path are configured as separate systems.
The fine particle-containing slurry thermal spraying device according to claim 1 or 2. The oxygen supply path has a plurality of first inclined holes communicating with the combustion chamber,
The fuel supply path has a plurality of second inclined holes communicating with the combustion chamber,
The plurality of first inclined holes and the second inclined holes are arranged such that the openings at the outlet end of the gas nozzle are alternately arranged on the same circumference, and the central axis of the openings is Inclined at substantially the same angle on the radial side toward the combustion chamber,
The fine particle-containing slurry spraying apparatus according to claim 3. A cap attached to the outer periphery of the gas nozzle and extending in the spraying direction, the combustion chamber being defined inside;
A scavenging medium is supplied to the inner peripheral wall surface of the cap.
The fine particle-containing slurry spraying apparatus according to any one of claims 1 to 4. The cap has a flow restrictor.
The fine particle-containing slurry spraying apparatus according to claim 5. The fine particle-containing slurry is a nanoparticle-containing slurry,
The slurry-conveying tube is supplied with the nanoparticle-containing slurry in an atomized state.
The fine particle-containing slurry spraying apparatus according to any one of claims 1 to 6. Fine particle-containing slurry spraying device according to any one of claims 1 to 7,
A slurry spraying device for atomizing the fine particle-containing slurry and supplying the slurry to the slurry transport pipe;
A fine particle-containing slurry spraying system, further comprising: a slurry supply device that supplies the fine particle-containing slurry to the slurry spraying device.   The fine particle-containing slurry spraying system according to claim 8, wherein the slurry supply device has a cassette type syringe pre-filled with a spraying material. A slurry supply path for connecting the slurry supply device and the slurry spraying device;
A slurry control valve provided in the slurry supply path and capable of opening and closing the path;
The slurry control valve is
A slurry inlet to which the slurry supply device is connected via the slurry supply path;
A slurry outlet to which the slurry spraying device is connected via the slurry supply path;
A flow path connecting chamber that connects the slurry inlet and the slurry outlet;
A first valve seat formed at a connection between the slurry inlet and the flow path connection chamber;
A second valve seat formed at a connection between the slurry outlet and the flow path connection chamber;
A valve closing position that is provided in the flow path connection chamber and closes the valve seat by contacting the first valve seat and the second valve seat, and is separated from the first valve seat and the second valve seat. A valve body that is movable over a valve open position that opens these valve seats,
The first valve seat and the second valve seat are inclined with respect to the moving direction of the valve body,
The fine particle-containing slurry spraying system according to claim 8 or 9. The valve body has a through-hole penetrating in the moving direction,
The flow path connecting chamber is configured such that, in the moving direction of the valve body, a space defined on one side of the valve body and a space defined on the other side communicate with each other through the through hole.
The fine particle-containing slurry spraying system according to claim 10. The valve body is elastically biased toward the first valve seat and the second valve seat in the valve closed position.
The fine particle-containing slurry spraying system according to claim 10 or 11. The slurry control valve is configured to be controlled to a valve open position when the pressure of the fine particle-containing slurry supplied from the slurry supply device is equal to or higher than a predetermined pressure.
The fine particle-containing slurry spraying system according to any one of claims 10 to 12. The predetermined pressure of the fine particle-containing slurry is higher than a pressure of a spray medium for the slurry spraying device to spray the fine particle-containing slurry.
The fine particle-containing slurry spraying system according to claim 13.

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