JP2016108607A - Stave cooler, production method of stave cooler, and blast furnace comprising stave cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce production cost, a number of transport, transport cost and size of a temporary arrangement space of a stave cooler, and prevent leakage of a cooling medium.SOLUTION: A stave cooler 100 comprises: an opening 102d formed on a main body, and opening a cooling channel to outside of the main body; a penetration hole fixed to the main body and communicating the cooling channel via the opening; a body 160 having a butt part in which, an end part of a circulation tube butts to inside of the penetration hole; a first screw part disposed on the body; a second screw part into which the circulation tube is inserted, and screwed to the first screw part; a bag nut 170 moving to the butt direction of the circulation tube, by screwing of the first screw part and second screw part; a sleeve member 180 disposed between the body and the bag nut, and having a claw part biting to an outer peripheral face of the circulation tube; and a press part for biting the claw part to the circulation tube.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stave cooler for cooling a furnace wall, a method for manufacturing a stave cooler, and a blast furnace equipped with a stave cooler.

  Conventionally, a stave cooler is generally made of cast iron in which a cooling channel is formed by a pipe cast into cast iron. However, in high pulverized coal injection operations that have become the mainstream in recent years, heat fluctuations in the furnace are repeated, so that the heat load in the furnace is large, and a cast iron stave cooler cannot ensure sufficient cooling performance. If the cooling performance of the stave cooler is insufficient, the surface inside the furnace wall of the furnace wall will become high temperature, the material deterioration and wear of the stave cooler will progress, or the warpage will occur due to thermal stress, which will interfere with the in-furnace profile. . Furthermore, there is a problem in that the stave cooler itself is cracked and damaged, so that the frequency of replacement of the stave cooler increases and the furnace life is shortened.

  Against this background, copper-based stave coolers have been widely adopted in recent years. Copper-based stave coolers are superior to iron-based stave coolers in terms of physical properties such as thermal conductivity and ductility, so they have a uniform temperature distribution at low temperatures, can suppress generated thermal stress, and reduce deformation. Can reduce the damage taken.

  In the copper-based stave cooler, a cooling channel is formed inside the stave cooler body by drilling or the like. Further, conventionally, a flow pipe for supplying a cooling medium to the cooling flow path or discharging the cooling medium from the cooling flow path is provided in the stave cooler body so as to communicate with an opening that leads to the cooling flow path. It was welded to the stave cooler body. As a technology for welding the flow pipe to the main body of the cooler, the flow pipe is made of copper so that it can be welded to the main body of the stave cooler, and the end of the flow pipe is inserted into the opening to form between the opening and the outer periphery of the flow pipe The technique which joins the groove | channel made by fillet welding is disclosed (for example, patent document 1, 2).

  However, as the thermal load fluctuates inside the furnace body, plastic strain occurs in the main body of the cooler, and cracks due to thermal fatigue occur in the welded portion between the main body of the cooler and the flow pipe due to repeated plastic strain. Sometimes. Moreover, since a welding residual distortion arises in a welding part, there exists a possibility that a defect and a crack may generate | occur | produce. Therefore, the welded part has a problem that the strength against bending and pulling is not sufficient.

  In addition, the welding of the distribution pipe is performed at the stave cooler manufacturing factory. When the distribution pipe is welded, the distribution pipe protrudes from the stave cooler body, so it protrudes when transporting from the production factory to the blast furnace installation site or when handling (for example, when holding it horizontally or lifting it). There is a possibility that the flow pipe may be bent or the welded part may be damaged. For this reason, there has been a problem that a great deal of attention in handling must be requested from the worker.

  Furthermore, since the distribution pipe protrudes, a plurality of stave coolers cannot be stacked, the number of times the stave cooler is transported and the transport cost are increased, and a large temporary storage space must be secured.

  Therefore, a technology has been developed in which a full face flange is joined to the end of the flow pipe, and the full face flange is fixed to the stave cooler body with a bolt so that the flow pipe and the opening communicate with each other (for example, patents). Reference 3). In this technology, the production pipe is manufactured separately from the distribution pipe and the stave cooler body, transported to the installation site of the blast furnace, and then the full face flange is fixed to the stave cooler body with bolts. To the stave cooler body. With this technology, it is possible to reduce the manufacturing cost, the number of times of transportation, and the transportation cost of the stave cooler.

JP 2002-60817 A JP-T-2001-507630 JP 2004-324986 A

  In the so-called flange joint in which the stave cooler main body and the flow pipe are joined with a flange in Patent Document 3 above, a sealing material (packing, gasket) is inserted between the stave cooler main body and the full face flange, and the full face seat flange. By tightening with a bolt, leakage of the cooling medium from the joint is prevented.

  However, in a high-temperature furnace gas atmosphere environment, the bolt may be expanded by thermal expansion, the sealing material may be loosened, and the cooling medium may leak. Further, contact with the gas in the furnace may cause deterioration of the sealing material and leakage of the cooling medium.

  An object of the present invention is to provide a stave cooler, a stave cooler manufacturing method, and a stave cooler capable of preventing leakage of a cooling medium while reducing the manufacturing cost of the stave cooler, the number of times of transport, the transport cost, the temporary storage space, and the like. Is to provide a blast furnace equipped with

  In order to solve the above problems, a stave cooler of the present invention is a stave cooler in which a flow pipe is fixed to a copper or copper alloy main body in which a cooling channel is formed, and is formed on the main body, and the cooling An opening that opens the flow path to the outside of the main body, a through hole that is fixed to the main body and communicates with the cooling flow path through the opening, and an end of the flow pipe abuts in the through hole A first joint member provided with the abutting portion, a first screwing portion provided in the first joint member, and a second screw threaded into the first screwing portion while the flow pipe is inserted therethrough. A second joint member that moves in the abutting direction of the flow pipe by screwing of the screwing part, the second screwing part, and the first screwing part, the first joint member, and the second joint A claw portion provided between the members and having a claw portion that bites into the outer peripheral surface of the flow pipe. And over Bed member, characterized in that the claw portion provided with a pressing portion to bite into the circulation pipe.

  A screwed portion provided on an inner periphery of the opening of the main body; and an attachment screwed portion provided on the first joint member and screwed into the screwed portion. The first joint member may be fixed to the main body by screwing the part and the mounting screw part.

  Moreover, the said to-be-threaded part and the said attachment screwing part are good also as a taper shape which a diameter reduces gradually toward the attachment direction of the said 1st joint member with respect to the said main body.

  An insert that is provided between the groove formed in the screwed portion and the groove formed in the mounting screw portion, and disperses the pressure acting on the screwed portion and the mounting screw portion. May be provided.

  In addition, the first joint member is provided with a seating surface that projects radially outward from the mounting threaded portion, and the seating surface is in a state where the first joint member is fixed to the main body. It may be in surface contact with the surface of the main body.

  The end of the through hole on the cooling flow path side may have a shape in which the diameter gradually increases toward the tip.

  In order to solve the above-mentioned problem, the method of manufacturing a stave cooler according to the present invention is a method of manufacturing a stave cooler in which a flow pipe is fixed to a copper or copper alloy main body in which a cooling channel is formed, and the main body A first joint member is fixed to the main body so that a through-hole communicates with the cooling flow path through an opening that is formed on the cooling flow path to the outside of the main body. A sleeve member having a claw portion that bites into the surface and a second joint member screwed into the first joint member are arranged in order from the end side of the flow pipe with the sleeve member and the second joint member. As described above, the end of the flow pipe is attached to the abutting portion provided in the through hole of the first joint member, and the second joint member is attached to the first joint. By screwing the member into the member, the second joint member is protruded from the flow pipe. By moving the second joint member in the abutting direction, a compressive load is applied to the sleeve member in the abutting direction, and the acting direction of the compressive load is changed by the movement in the abutting direction. The nail portion is bitten into the flow pipe.

  In order to solve the above problems, the blast furnace of the present invention is a blast furnace including a stave cooler in which a flow pipe is fixed to a main body made of copper or a copper alloy in which a cooling channel is formed, and the stave cooler includes: An opening formed in the main body and opening the cooling flow path to the outside of the main body; a through hole fixed to the main body and communicating with the cooling flow path through the opening; and A first joint member provided with an abutting portion against which an end portion of the flow pipe is abutted; a first threaded portion provided in the first joint member; and the first pipe is inserted through the flow pipe. A second threaded portion that is threadedly engaged with the mating portion; a second joint member that moves in the abutting direction of the flow pipe by the threaded engagement of the second threaded portion and the first threaded portion; An outer peripheral surface of the flow pipe provided between the one joint member and the second joint member A sleeve member having a claw portion biting, characterized in that the claw portion provided with a pressing portion to bite into the circulation pipe.

  ADVANTAGE OF THE INVENTION According to this invention, the leakage of a cooling medium can be prevented, reducing the manufacturing cost of a stave cooler, the frequency | count of conveyance, conveyance cost, temporary storage space, etc.

It is a conceptual diagram for demonstrating a blast furnace. It is a schematic sectional drawing which shows the installation state of a stave cooler. FIG. 3 is an AA arrow view of FIG. 2. It is a figure for demonstrating the specific structure of the connection mechanism for fixing a flow pipe to a main body. It is a schematic sectional drawing which shows the installation state of the stave cooler concerning a 1st modification. It is a figure for demonstrating fixation with the main body concerning a 1st modification, and a flow pipe. It is a figure for demonstrating fixation with the main body concerning a 2nd modification, and a flow pipe.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a conceptual diagram for explaining a blast furnace 1. A blast furnace 1 shown in FIG. 1 melts iron ore, which is a metal raw material, to produce pig iron. Iron ore, a reducing agent serving as a fuel such as coke, limestone that removes impurities (hereinafter referred to as iron ore, A mixture of a reducing agent, limestone, and the like is simply referred to as “filling in the furnace”) into the furnace body 6.

  A tuyere 12 is provided below the furnace body 6, and hot air is introduced into the furnace body 6 from the tuyere 12. The hot air introduced into the furnace body 6 ascends the furnace body 6, but when coke in the in-furnace filling falling from the distribution chute 10 is burned by the hot air, carbon monoxide (reducing agent) is generated, and carbon of the coke is produced. Along with a reduction reaction in which the components deprive oxygen from iron, carbon dioxide and heat are generated, and this reaction serves as a heat source to melt the iron ore. In the dropping process of the filling in the furnace, such a reaction is continuously performed, and the temperature in the furnace reaches the maximum when reaching the lower part of the furnace body 6, and high-temperature liquid pig iron is obtained at the bottom of the furnace body 6. A gas conduit (downcomer) 14 is connected to the top of the furnace body 6, and high-temperature blast furnace gas is discharged from the furnace body 6 to the gas conduit (downcomer) 14.

  Further, since the inside of the furnace body 6 becomes extremely hot, a stave cooler 100 that cools and protects the furnace wall 6 a called a “iron skin” is installed inside the furnace body 6. Many stave coolers 100 are installed along the inner peripheral surface of the furnace wall 6a. Below, the structure of the stave cooler 100 is explained in full detail.

(Stave cooler 100)
FIG. 2 is a schematic cross-sectional view showing an installation state of the stave cooler 100, and FIG. 3 is an AA arrow view of FIG. As shown in FIGS. 2 and 3, the stave cooler 100 of the present embodiment includes a main body 102 made of a rolled sheet of copper or copper alloy that is disposed with a gap maintained on the inner peripheral surface of the furnace wall 6 a of the blast furnace 1. I have.

  Hereinafter, in the installed state in which the main body 102 is disposed on the inner peripheral surface of the furnace wall 6a, the surface facing the center side of the space surrounded by the furnace wall 6a is referred to as the surface 102a, and the gap is maintained in the furnace wall 6a. In other words, the surface facing the furnace wall 6a is the back surface 102b. And in the installation state of the stave cooler 100, the direction which connects the upper surface located in the furnace top part side of the furnace body 6, and the lower surface located in the lower part side of the furnace body 6 is the height direction (x direction in the figure) of the main body 102. The direction connecting the front surface 102a and the back surface 102b is the thickness direction (y direction in the figure) of the main body 102, and the height direction and the direction orthogonal to the thickness direction are the width direction of the main body 102 (z direction in the figure). explain.

  As shown in FIG. 2, a fixing pin 6 b is attached to the inner peripheral surface of the furnace wall 6 a, and the fixing pin 6 b is inserted into a pin hole 104 provided on the back surface 102 b of the main body 102. The load of 102 is supported, and the main body 102 is positioned. Bolts 108 are fixed to the back surface 102b of the main body 102 via bolt part spacers 106, and the stave cooler 100 is fixed and installed in the furnace wall 6a by the bolts 108. A plurality of dovetail grooves (concave grooves) are formed on the surface 102a of the main body 102, and a refractory material 110 is attached to the dovetail grooves.

  As is clear from FIGS. 2 and 3, a plurality of (four in this embodiment) cooling channels 112 through which a cooling medium flows are circulated inside the main body 102 by drilling using a drill or the like. Is formed. Each cooling flow path 112 extends linearly in the height direction (x direction) of the main body 102 from the upper surface side to the lower surface side of the main body 102, and each cooling flow path 112 extends in the width direction ( (z direction) are arranged in parallel at a predetermined interval. Further, the upper end and the lower end of each cooling flow path 112 are sealed with plug plugs 114.

  Furthermore, a water supply pipe 116 (flow pipe) is connected to the lower end side of each cooling flow path 112 and a drain pipe 118 (flow pipe) is connected to the upper end side of each cooling flow path 112 by a coupling mechanism 150 described later. ing. At this time, a pipe portion spacer 120 is provided between the back surface 102b of the main body 102 and the furnace wall 6a, which is a connection portion between the main body 102, the water supply pipe 116, and the drain pipe 118. A compensator 114a having a gas sealing function is provided outside the furnace wall 6a so that no stress is applied to the water supply pipe 116 and the drain pipe 118 when the main body 102 is thermally deformed. In addition, in the opening 6c of the furnace wall 6a and the internal space of the seal hardware 6d erected from the opening 6c, a shrinkable refractory material such as a wool material is used in order to prevent high temperature gas from entering the furnace and to insulate it. (Not shown) is filled.

  With the above configuration, when the cooling medium is supplied from the water supply pipe 116 to the cooling flow path 112, the cooling medium is moved from the lower side to the upper side in the height direction (x direction) of the furnace wall 6 a inside the main body 102. The cooling medium is discharged from the drain pipe 118 to the outside of the furnace body 6. Thereby, the furnace wall 6a of the furnace body 6 is cooled in the process in which the cooling medium circulates inside the main body 102.

  The connecting mechanism 150 that connects the water supply pipe 116, the drain pipe 118, and the main body 102 includes a body 160 (first joint member), a cap nut 170 (second joint member), and a sleeve member 180. The

  FIG. 4 is a diagram for explaining a specific configuration of the coupling mechanism 150 for fixing the flow pipe to the main body 102. In FIG. 4, the drain pipe 118 is described as an example of the flow pipe, but it goes without saying that the water supply pipe 116 is also fixed to the main body 102 by the connecting mechanism 150 similarly to the drain pipe 118.

  As shown in FIG. 4A, the body 160 has a through hole 162 formed from one end side to the other end side. The through-hole 162 has a taper-shaped tapered portion 162a whose diameter gradually decreases from one end side toward the other end side, and extends from the small-diameter side end portion of the tapered portion 162a to the other end side and has a small diameter of the tapered portion 162a. An extending portion 162b having the same diameter and a small diameter portion 162c extending from the extending portion 162b to the other end side and having a smaller diameter than the extending portion 162b are provided. Further, an abutting portion 162d is formed between the extending portion 162b and the small diameter portion 162c.

  On the outer peripheral surface of the body 160, a screw part 164 (first screwing part) is provided on one end side, and a taper screw part 166 (attachment screwing part) is provided on the other end side. Further, on the outer peripheral surface of the body 160, a seat surface 168 is provided between the screw portion 164 and the taper screw portion 166 so as to protrude radially outward from the taper screw portion 166.

  The cap nut 170 includes a cylindrical portion 172 and a flat portion 174 that closes one end of the cylindrical portion 172, and an insertion hole 174 a through which the drain pipe 118 is inserted is formed in the flat portion 174. Since the cylindrical portion 172 has an inner diameter larger than the outer diameter of the drain pipe 118, an accommodation space 172 a is formed between the inner peripheral surface of the cylindrical portion 172 and the outer peripheral surface of the drain pipe 118. . Further, a screw portion 176 (second screwing portion) is provided on the inner peripheral surface of the cylindrical portion 172.

  The sleeve member 180 has a cylindrical shape through which the drain pipe 118 is inserted, and has an inner diameter slightly larger than the outer diameter of the drain pipe 118. Further, a cutting wedge 182 (claw portion) that bites into the outer peripheral surface of the drain pipe 118 is provided on the inner periphery of the sleeve member 180. The sleeve member 180 is accommodated in the accommodating space 172 a of the cap nut 170 and is provided between the cap nut 170 and the body 160.

  Then, the manufacturing method of the stave cooler 100 is demonstrated using FIG.

  As shown in FIG. 4A, the main body 102 is formed with an opening 102d that opens the cooling flow path 112 to the outside of the main body 102, and a pipe taper thread 102e (on the inner peripheral surface of the opening 102d). A threaded portion) is formed.

  When fixing the drain pipe 118 to the main body 102, as shown in FIG. 4A, first, the taper screw part 166 provided on the other end side of the body 160 is screwed into the pipe taper screw part 102e. Then, the seating surface 168 comes into surface contact with the surface of the main body 102 (see FIGS. 4B and 4C).

  Next, the cap nut 170 and the sleeve member 180 are inserted through the drain pipe 118 so that the sleeve member 180 and the cap nut 170 are sequentially arranged from the end 118 a side of the drain pipe 118. The sleeve member 180 is inserted into the drain pipe 118 so that the cutting wedge 182 is disposed on the end portion 118a side. After the cap nut 170 and the sleeve member 180 are inserted into the drain pipe 118, the end 118 a of the drain pipe 118 is abutted against the abutting portion 162 d of the body 160, and the screw portion 176 of the cap nut 170 is screwed to the screw of the body 160. Screwed into the portion 164 (see FIGS. 4B and 4C). Then, the cap nut 170 moves in the abutting direction of the drainage pipe 118 (that is, the cooling channel 112 side, the left side in FIG. 4) by screwing the screw portions 164 and 176 together.

  As the cap nut 170 moves in the abutting direction, the sleeve member 180 is sandwiched between the flat surface portion 174 and the tapered portion 162a, and a compressive load acts on the sleeve member 180 in the abutting direction. Further, since the tapered portion 162a has a tapered shape whose diameter gradually decreases in the abutting direction, the compressive load acting on the sleeve member 180 is converted to the inner side (the drain pipe 118 side) and the cutting wedge 182 is drained. It will bite into the tube 118 (metal contact seal). That is, the flat portion 174 and the tapered portion 162a cause the compressive load to act on the sleeve member 180 in the abutting direction by the movement of the cap nut 170 in the abutting direction, and also change the acting direction of the compressive load and perform cutting. It functions as a pressing portion that causes the wedge 182 to bite into the flow pipe.

  On the other hand, one end 184 of the sleeve member 180 is crimped to the outer periphery of the drainage pipe 118 by the flat part 174, and the leakage of the cooling medium from the joint of the end 118a of the drainage pipe 118 is suppressed, and the connection mechanism It is possible to prevent the drainage pipe 118 from being detached from 150.

  In this way, the drain pipe 118 is fixed to the main body 102, and the drain pipe 118 communicates with the cooling flow path 112 via the through hole 162 and the opening 102d of the body 160.

  As described above, the cutting wedge 182 is drained by the configuration in which the main body 102 and the distribution pipe (the water supply pipe 116 and the drain pipe 118) are fixed using the connecting mechanism 150 including the body 160, the cap nut 170, and the sleeve member 180. A metal contact seal is formed by biting into the pipe 118, so that the main body 102 and the flow pipe can be firmly connected. This makes it possible to prevent leakage of the cooling medium from the flow pipe without any sealing material such as an O-ring and packing.

  In addition, compared to the conventional technique of welding the main body 102 and the flow pipe, since there is no occurrence of welding residual strain that causes defects or cracks in the welded portion, it is possible to ensure strength against bending and pulling. Become. In addition, the manufacturing cost can be reduced.

  Furthermore, the connection mechanism 150 of the present embodiment can easily fix the flow pipe to the main body 102 with a commonly used tool such as a spanner or a wrench without using a dedicated jig. Therefore, the main body 102, the distribution pipe (the water supply pipe 116, the drain pipe 118), and the connection mechanism 150 are manufactured separately, and the distribution pipe can be fixed to the main body 102 at the installation site of the blast furnace 1. . Accordingly, the main bodies 102 can be stacked when transporting from the manufacturing factory to the installation site of the blast furnace 1 or when handling (for example, when holding or lifting), reducing the number of times of transportation and transportation costs. In addition, it is possible to make it unnecessary to secure a wide temporary storage space.

  Further, since the sleeve member 180 of the coupling mechanism 150 has a mechanical elastic force inside, the cap nut 170 can be strongly biased to prevent the cap nut 170 from loosening due to vibration or the like.

  Furthermore, the body 160 includes a seating surface 168, and when the body 160 is fixed to the main body 102, the seating surface 168 is in surface contact with the surface of the main body 102, so that the main body 102 and the body 160 can be closely bonded. It becomes possible to ensure the mechanical strength of the base portion of the coupling mechanism 150.

  In the present embodiment, the pipe taper screw portion 102 e of the main body 102 and the taper screw portion 166 of the coupling mechanism 150 have a tapered shape whose diameter gradually decreases in the direction in which the body 160 is attached to the main body 102. Since it has a tapered shape, if it is tightly screwed in, there will be no gap to prevent fluid leakage and loosening between the main body 102 and the body 160 can be suppressed, and the mechanical strength of the base of the coupling mechanism 150 can be ensured. It becomes.

  Furthermore, the body 160 of the present embodiment has a shape in which the end 162e of the through hole 162 (small diameter portion 162c) on the cooling flow path 112 side gradually increases in diameter toward the tip, that is, a so-called bellmouth curved surface shape. . Thereby, the pressure loss at the time of suction of the cooling medium can be reduced to 1/20 or less as compared with the case where the end portion 162e is a straight inlet pipe having the same diameter. The effect of reducing the pressure loss of the coolant due to the curved shape of the bell mouth is particularly effective in the drain pipe 118.

  In addition, the coupling mechanism 150 and the distribution pipe (the water supply pipe 116 and the drain pipe 118) of the present embodiment are made of austenitic stainless steel (for example, SUS304). Austenitic stainless steel has a linear expansion coefficient of 17.3 × 10 −6 / ° C., which is very close to the linear expansion coefficient of copper, which is the material of the main body 102, 17.1 × 10 −6 / ° C. For this reason, the thermal stress between the main body 102, the connection mechanism 150, and a flow pipe can be reduced. It is also possible to improve the corrosion resistance of the coupling mechanism 150 and the flow pipe.

  Austenitic stainless steel has a tensile strength of 2.5 times or more and high mechanical strength. Therefore, mechanical strength can be improved by comprising the connection mechanism 150 and a flow pipe with austenitic stainless steel compared with the case where it comprises copper or a copper alloy.

  In addition, various metal materials have their own potentials, and when the metal material corrodes in a moist environment, most of it is due to an electrochemical reaction. It is well known that when different metals, that is, metals of different potentials are combined in an electrolyte (in water or seawater), low potential metals corrode due to differences in ionization tendency. The potential when a metal is dissolved as an ion differs depending on the metal. For example, the anticorrosion potential of a steel material is −0.77 (V.SCE), and copper or a copper alloy is −0.35 to −0. .5 (V.SCE), and stainless steel is -0.4 to -0.7 (V.SCE). Therefore, for example, when copper and iron are combined, a metal having a low potential “iron” serves as an anode (anode), and a noble metal “copper” serves as a cathode (cathode) to form a battery. "Iron" corrodes.

  Conventionally, the distribution pipe is made of copper with respect to the copper main body, and an inexpensive steel pipe is used as a communication pipe for connecting between the stave coolers outside the furnace. Since the copper pipe and the steel pipe cannot be welded, the connection between the flow pipe and the connecting pipe is a flange joint. However, in order to avoid the above-described electrochemical corrosion, it has been necessary to use, for example, rubber packing that can be electrically insulated for the sealing material of the flange joint surface of the copper pipe and the steel pipe. Furthermore, plastic insulation sleeves had to be used for flange-joined bolts.

  However, in this embodiment, since the coupling mechanism 150 and the flow pipe are made of austenitic stainless steel whose potential difference is close to that of copper, even when combined with the copper body 102, electrochemical corrosion is suppressed. Therefore, it is possible to avoid the trouble of performing electrical insulation.

  Moreover, according to this embodiment, the connection pipe and the distribution pipe which connect between each stave cooler 100 can be welded via a L-shaped pipe etc. by using austenitic stainless steel for a distribution pipe. For this reason, the conventional flange joint becomes unnecessary and it becomes possible to improve the working efficiency of the worker.

(First modification)
In the above embodiment, the configuration in which the pipe taper screw portion 102e is formed in the opening portion 102d of the main body 102 has been described as an example. However, another member provided with a portion to be screwed with the taper screw portion 166 of the body 160 may be fixed to the main body 102.

  FIG. 5 is a schematic cross-sectional view showing an installation state of the stave cooler 100 according to the first modification, and FIG. 6 illustrates fixing of the main body 102 and the distribution pipe (drain pipe 118) according to the first modification. FIG. Moreover, Fig.6 (a) shows the state before fixation with the main body 102 and a flow pipe (drainage pipe 118), and FIG.6 (b) shows the state after fixation. As shown in these drawings, in the first modification, after the screw sleeve 200 having a flange portion is inserted into the opening 102 d of the main body 102, the screw sleeve 200 is welded to the main body 102. As a result, the screw sleeve 200 is fixed to the main body 102 by the fillet welded portion 202 so that the cooling medium does not leak from the opening 102d to the outside.

  Further, the screw sleeve 200 is provided with a taper-shaped taper screw hole 204 (threaded portion) whose diameter gradually decreases from one end side toward the other end side. The taper screw hole 204 has a dimensional relationship to be screwed with the taper screw portion 166 of the body 160.

  As described above, the main body 102 can be provided with a portion to be screwed with the taper screw portion 166 of the body 160 by simply inserting the screw sleeve 200 into the opening 102d and welding the main body 102. As a result, it is possible to save the trouble of screwing the main body 102 itself, and the manufacturing cost can be greatly reduced.

  The screw sleeve 200 may be made of substantially the same material (copper or copper alloy) as the main body 102.

  The screw sleeve 200 may be inserted into the opening 102d by heating the periphery of the opening 102d of the main body 102 to expand the hole diameter and shrink-fitting the screw sleeve 200. By shrink-fitting the screw sleeve 200, the opening 102d of the main body 102 and the screw sleeve 200 can be tightly joined, and a decrease in heat conduction at these boundary portions can be avoided.

(Second modification)
FIG. 7 is a view for explaining fixation between the main body 102 and the flow pipe (drain pipe 118) according to the second modification. Moreover, Fig.7 (a) shows the state before fixation with the main body 102 and a flow pipe (drainage pipe 118), and FIG.7 (b) shows the state after fixation.

  As shown in FIG. 7, in the second modification, the main body 102 is provided with the same diameter screw hole 264 (threaded portion) having the same diameter in the screwing direction instead of the taper screw hole 204. . Further, instead of the taper screw portion 166 of the body 160, a same-diameter screw portion 266 (attachment screw portion) that is screwed into the same-diameter screw hole 264 is provided. Then, the body 160 is screwed into the same diameter screw hole 264 with the insert 270 attached to the same diameter screw portion 266 of the body 160. Then, between the groove | channel formed in the same diameter screw hole 264 (attachment screwing part) provided in the main body 102, and the groove | channel formed in the same diameter screw part 266 (screwed part) of the body 160, The insert 270 is mounted, and the same diameter screw hole 264 and the same diameter screw portion 266 are screwed together.

  The insert 270 is made of austenitic stainless steel and is a spring-like coil. Further, in the insert 270, one section of the coil has a rectangular shape (diamond shape). The insert 270 can absorb the lead error and the angle error between the male screw and the female screw, and can distribute the pressure acting on the same-diameter screw hole 264 and the same-diameter screw portion 266. Thereby, the strength of the body 160 (same diameter screw portion 266) can be improved, and the durability of the connection between the body 160 and the main body 102 (screw sleeve 200) can be improved.

  Further, it is possible to prevent the thread from being damaged due to wear, corrosion, vibration or the like of the same diameter screw hole 264 and the same diameter screw portion 266. Therefore, even if assembly and disassembly are frequently performed, damage can be avoided.

  Further, the fatigue limit of the same-diameter screw hole 264 and the same-diameter screw portion 266 can be increased, and the contact ratio of the meshing of the screws can be improved, and the stress distribution can be brought into an ideal state. As a result, it is possible to withstand repeated loading and to reduce the amount of load borne by the screw thread.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  For example, in the above-described embodiment, the configuration in which the main body 102 and the body 160 (first joint member) are fixed by being screwed together is described as an example. However, the fixing means between the main body 102 and the body 160 is not limited to screwing, and other fixing means such as welding may be used.

  In the above embodiment, the taper screw portion 102e (threaded portion), the taper screw portion 166 (mounting screw portion), and the taper screw hole 204 (threaded portion) are tapered, but have the same diameter. Also good.

  In the second modified example, the configuration in which the insert 270 is mounted between the same diameter screw hole 264 and the same diameter screw portion 266 has been described as an example. However, the insert 270 may be mounted between the taper screw hole 204 and the taper screw portion 166 which are tapered.

  Moreover, in the said embodiment, the structure which provides the seat surface 168 in the body 160 was mentioned as an example, and was demonstrated. However, the seating surface 168 is not an essential configuration.

  In the above-described embodiment, the configuration in which the end of the through hole 162 of the body 160 on the cooling flow path side has a shape in which the diameter gradually increases toward the tip has been described as an example. However, the through hole 162 of the body 160 may have the same diameter.

  Moreover, in the said embodiment, the case where the connection mechanism 150 and the flow pipe were comprised with austenitic stainless steel was mentioned as an example, and was demonstrated. However, at least members (for example, the body 160, the screw sleeve 200, and the insert 270) that are in contact with the main body 102 may be made of austenitic stainless steel.

  INDUSTRIAL APPLICABILITY The present invention can be used for a stave cooler that cools a furnace wall, a stave cooler manufacturing method, and a blast furnace equipped with a stave cooler.

DESCRIPTION OF SYMBOLS 1 Blast furnace 100 Stave cooler 102 Main body 102d Opening 102e Pipe taper thread part (threaded part)
112 Cooling channel 116 Water supply pipe (distribution pipe)
118 Drain pipe (distribution pipe)
118a End 160 Body (first joint member)
162 Through-hole 162a Tapered part (pressing part)
162d Abutting portion 164 Screw portion (first screwing portion)
166 Tapered screw part (mounting screw part)
168 Seat 170 Cap nut (second joint member)
174 Plane part (pressing part)
176 Screw part (second screwing part)
180 Sleeve member 182 Cutting wedge (claw part)
204 Tapered screw hole (threaded part)
H.264 Same diameter screw hole (threaded part)
266 Same diameter screw part (Mounting screw part)
270 insert

Claims (8)

A stave cooler in which a flow pipe is fixed to a copper or copper alloy body in which a cooling channel is formed,
An opening formed in the main body and opening the cooling channel to the outside of the main body;
A through hole fixed to the main body and communicating with the cooling flow path through the opening;
A first joint member provided with an abutting portion against which an end of the flow pipe is abutted in the through hole;
A first threaded portion provided on the first joint member;
A second screwing portion through which the flow pipe is inserted and screwed into the first screwing portion;
A second joint member that moves in the abutting direction of the flow pipe by screwing the second screwing portion and the first screwing portion;
A sleeve member provided between the first joint member and the second joint member, and having a claw portion that bites into an outer peripheral surface of the flow pipe;
A pressing part for causing the claw part to bite into the flow pipe, and
Stave cooler characterized by having. A threaded portion provided on the inner periphery of the opening of the main body;
An attachment screwing portion provided on the first joint member and screwed into the screwed portion;
With
2. The stave cooler according to claim 1, wherein the first joint member is fixed to the main body by screwing between the screwed portion and the mounting screwed portion.   3. The stave cooler according to claim 2, wherein the threaded portion and the mounting threaded portion have a tapered shape whose diameter gradually decreases in a direction in which the first joint member is attached to the main body.   An insert is provided between a groove formed in the threaded portion and a groove formed in the mounting threaded portion, and disperses pressure acting on the threaded portion and the mounting threaded portion. The stave cooler according to claim 2 or 3, characterized in that.   The first joint member is provided with a seat surface that protrudes radially outward from the mounting threaded portion, and the seat surface is fixed to the main body in a state where the first joint member is fixed to the main body. The stave cooler according to any one of claims 2 to 4, wherein the stave cooler is in surface contact with the surface.   The stave cooler according to any one of claims 1 to 5, wherein the end of the through hole on the cooling flow path side has a shape in which a diameter gradually increases toward the tip. A manufacturing method of a stave cooler in which a flow pipe is fixed to a copper or copper alloy body in which a cooling channel is formed,
The first joint member is fixed to the main body so that a through hole communicates with the cooling flow path through an opening formed in the main body and opening the cooling flow path to the outside of the main body.
A sleeve member having a claw portion that bites into the outer peripheral surface of the flow pipe, and a second joint member screwed into the first joint member, in order from the end side of the flow pipe, the sleeve member and the second joint Attach to the flow pipe so that it is arranged with the member,
The end of the flow pipe is abutted against the abutting portion provided in the through hole of the first joint member,
By screwing the second joint member into the first joint member, the second joint member is moved in the abutting direction of the flow pipe,
By moving the second joint member in the abutting direction, a compressive load is applied to the sleeve member in the abutting direction, and the acting direction of the compressive load is changed so that the claw portion is connected to the flow pipe. A method of manufacturing a stave cooler, characterized in that the stave cooler is bitten into the wall. A blast furnace equipped with a stave cooler in which a flow pipe is fixed to a copper or copper alloy body in which a cooling channel is formed,
The stave cooler
An opening formed in the main body and opening the cooling channel to the outside of the main body;
A through hole fixed to the main body and communicating with the cooling flow path through the opening;
A first joint member provided with an abutting portion against which an end of the flow pipe is abutted in the through hole;
A first threaded portion provided on the first joint member;
A second screwing portion through which the flow pipe is inserted and screwed into the first screwing portion;
A second joint member that moves in the abutting direction of the flow pipe by screwing the second screwing portion and the first screwing portion;
A sleeve member provided between the first joint member and the second joint member, and having a claw portion that bites into an outer peripheral surface of the flow pipe;
A pressing part for causing the claw part to bite into the flow pipe, and
A blast furnace equipped with a stave cooler characterized by comprising

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