KR100730599B1 - Manufacturing method of an inner-liner inner body - Google Patents

Abstract

A manufacturing method of an inner-liner inner body is provided to form the inner body using a plate member to rapidly supply the inner body with a low cost and to prevent the inner body from being damaged. A manufacturing method of an inner-liner inner body having an upper inner body(21a) and a lower inner body(21b) includes an upper inner body forming step, a lower inner body forming step, and an inner body assembling step. Firstly the upper inner body forming step is performed to form the upper inner body of the inner body. Since the upper inner body has the same diameter of an upper end as a diameter of a lower end, the upper inner body is manufactured with a rectangular plate. A predetermined sized rectangular plate is prepared and is supplied between an upper roller and a lower roller. The upper roller and the lower roller form thermal expansion preventing wrinkles in the supplied plate. The upper roller has a protrusion formed in an outer circumference and the lower roller has a recess formed in the outer circumference. The upper roller and the lower roller rotate in opposite direction to bit the supplied rectangular plate to form the wrinkles.

Description

Manufacturing method of inner liner inner body

1 is a partial configuration diagram of a power plant in which an inner liner related to the present invention is used.

Figure 2 is a perspective view of the inner liner inner body completed in accordance with the present invention.

Figure 3 is a simplified work flow chart showing the process of the inner liner inner manufacturing method according to the present invention.

<Description of Major Symbols Used in Drawings>

20: internal 21a: upper internal

21b: Lower inner body R1: Upper roller

R2: Lower roller protrusion: r1

r2: groove

W: Expansion prevention corrugation P1: Straight plate

P2: Curved plate guide: G

The present invention relates to an inner liner (inner liner) required for the installation of gas turbines used in power generation equipment, and more particularly to a method for manufacturing the inner liner body developed to solve the manufacturing difficulties due to the specificity of the shape. will be.

The structure of the main part of the power plant using a gas turbine will be described, and FIG. 1 shows a partial configuration diagram of a power plant in which an inner liner related to the present invention is used.

As shown, the compressor is connected to one side of the long shaft 10 and the turbine is formed on the other side. In addition, a combustion chamber is provided above the shaft 10 and the high pressure air formed by the compressor is supplied to the combustion chamber and used for combustion of fuel. The high temperature and high pressure gas generated in the combustion chamber is moved to the blade of the shaft through the inner liner 20 and the induction casing 30 as shown, and as the high temperature and high pressure gas collides with the blade, rotational force is generated in the shaft. do.

The shaft is disposed through the lower portion of the induction casing, the inner liner is coupled to the upper end of the induction casing. The high temperature and high pressure gas generated in the combustion chamber is introduced into the induction casing through the inner liner, and both the inner liner and the induction casing are prone to damage by heat and pressure because they are exposed for a long time under poor conditions of the high temperature and high pressure.

Therefore, the innerliner and the induction casing should be made of a material which can basically have sufficient heat resistance, and these points should be taken into consideration when designing.

The inner liner 20 is composed of a double structure of the inner body 21 and the outer body 22, and the inner liner and the outer body are manufactured and combined to complete the inner liner. In particular, the inner body is in direct contact with the gas at a high temperature and high pressure as compared to the outer body, so that the inner body needs to be provided with a plurality of wrinkles for preventing thermal expansion.

However, until now, there is no known production method for placing thermal expansion wrinkles on a product such as an inner body having a complicated shape that can be used in a large-scale facility such as a power generation facility. Of course, if manufactured by casting can be easily produced, but the disadvantages in terms of cost compared to using the plate material is a situation that is urgently required a method for producing the inner body using the plate material.

Therefore, in order to solve the problems of the prior art as described above, in the present invention, it is possible to manufacture an inner body having a complicated shape using a plate, the inner body is separated into an upper inner body and a lower inner body and to prevent wrinkles in each of the thermal expansion. And finally, to propose a technology that can provide a single inner liner inner body by welding the lower body and the upper body.

The present invention for achieving the object as described above, the inner production method of the inner liner (inner liner) is connected to the upper portion of the induction casing for supplying hot gas to the gas turbine used in the power generation equipment, the inner and outer double structure. The upper body forming step of supplying a rectangular plate between the upper roller and the lower roller to form a thermal expansion preventing wrinkles at equal intervals, and then bending and welding in a circular shape; The curved curved plate member is supplied between the upper roller and the lower roller to form the right and left symmetrical to form a wrinkle-shaped thermal expansion prevention wrinkles forming equal intervals, and by placing a guide for rolling motion at the inlet and the outlet, the base of the curved plate A lower inner body forming step of forming a corrugation for preventing thermal expansion by moving the curved sheet material in the same direction as the curvature, and then bending and welding the tapered form so that both ends thereof are in contact with each other; The inner liner inner body manufacturing method characterized in that it comprises a; the inner body assembly step of welding the upper body and the lower body produced by the inner body forming step and the lower body forming step.

In addition, the inner liner inner manufacturing method relates to an inner liner inner manufacturing method further comprises a heat treatment step to improve the structure by heating and cooling after the inner assembly step.

In addition, the heat treatment step relates to the inner liner inner fabric manufacturing method characterized in that the heat treatment in an upside down state so that the upper body is directed downward.

In addition, the upper roller and the lower roller relates to the inner liner inner manufacturing method characterized in that to move to the left and right to form a neighboring thermal expansion prevention wrinkles.

And the upper roller is provided with two protrusions, the lower roller is formed in the rectangular plate or curved plate to be inserted into the two grooves corresponding to the protrusion formed thermal expansion prevention wrinkles, but for the first time to prevent two thermal expansion The inner liner inner fabric manufacturing method characterized in that to form a wrinkle, and then the subsequent processing to form one of the thermal expansion prevention wrinkles on the basis of any one of the first processed thermal expansion prevention wrinkles.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, since the accompanying drawings are presented as a way of helping the understanding of the present invention, various modifications are possible within the scope of the same technical idea.

Figure 2 is a perspective view of the inner liner inner body completed in accordance with the present invention, Figure 3 is a simplified work flow chart showing the process of the inner liner inner body manufacturing method according to the present invention.

The inner body 21 is manufactured by being divided into an upper inner body 21a and a lower inner body 21b. The main components include upper inner molding step (I), lower inner molding step (II), and inner assembly step (III). It will include.

In the present invention, to provide the inner liner inner body using a metal plate, to provide a thermal expansion prevention wrinkles for preventing deformation or breakage under high temperature and high pressure.

In the first step, the upper inner body forming step (I) is performed. This is for molding the upper inner body 21a of the inner body 21, and the upper inner body 21a has the same diameter as the upper end and the lower end, so that the rectangular plate P1 is formed. Produce using). That is, a rectangular plate P1 of a predetermined size cut in advance is prepared, and the rectangular plate is supplied between the upper roller R1 and the lower roller R2.

The upper roller (R1) and the lower roller (R2) is paired with each other to form a thermal expansion preventing wrinkles (W) in the plate material supplied to this, for this purpose, a protrusion (r1) is formed on the outer surface of the upper roller (R1) And a concave groove r2 is provided on the outer surface of the lower roller R2. The upper roller (R1) and the lower roller (R2) is rotated in the opposite direction to bit the rectangular plate (P1) supplied to form a thermal expansion wrinkle (W) in the plate. At this time, the rectangular plate (P1) can be advanced by the friction force by the upper roller (R1) and the lower roller (R2) without a separate transfer power. In some cases, a pushing unit for pushing the rectangular plate P1 at an appropriate speed may be provided.

In the present example, the upper roller R1 and the lower roller R2 are provided with two protrusions r1 and grooves r2. First, the rectangular plate material P1 is used as the upper roller R1 and the lower roller. Supplying between (R2) produces two thermal expansion wrinkles (W). Depending on the size of the upper body 21a, the number of thermal expansion preventing wrinkles (W) may be several. Therefore, when forming the third thermal expansion preventing wrinkles, the second thermal expansion preventing wrinkles among the first two thermal expansion preventing wrinkles are formed. As a baseline, to form one of the thermal expansion wrinkles. In other words, when the third thermal expansion prevention wrinkles are to be molded, the third thermal expansion prevention wrinkles are made based on the second thermal expansion prevention wrinkles as a reference line by setting and rotating one protrusion and groove of the upper roller and the lower roller to the second thermal expansion prevention wrinkles. . The fourth and fifth wrinkles can also be molded in the same way. After forming the first two thermal expansion wrinkles, the upper and lower rollers are moved to make neighboring thermal expansion wrinkles. That is, the upper roller and the lower roller should be basically rotated in conjunction with the drive motor (not shown), and should have a structure that can move.

 The plurality of thermal expansion preventing wrinkles W formed on the rectangular plate P1 constituting the upper body 21a form a straight line, and both ends of the rectangular plate P1 are formed when the forming of the thermal expansion preventing wrinkles W is completed. Bend round so that it touches and fix by welding.

The second step is the lower inner body forming step (II), and the lower inner body 21b has a shape in which the diameter decreases from the upper end to the lower end. The plate used in the lower internal forming step (II) has a curved shape and will be referred to as a curved plate (P2). The curved plate material (P2) is pre-cut to form the left and right symmetry, and a plurality of wrinkles (W) for preventing the thermal expansion of the curved form by using the upper roller (R1) and the lower roller (R2) is formed at equal intervals.

Inlet part to which curved plate material P1 is supplied based on upper roller R1 and lower roller R2 and discharged after molding to form wrinkles W for preventing thermal expansion in the same shape as the basic curvature of curved plate material P2. At the outlet portion, a plurality of guides G contacting the inner curved portion and the outer curved portion of the curved plate member are disposed. The guide G is clouded in contact with the curved plate member P2, and arranges the guide so that the curved plate member P2 can be moved in the same direction as the basic curvature thereof.

The upper roller (R1) and the lower roller (R2) is the same as in the above-mentioned upper internal molding step, it will be installed in different arrangements. As shown in FIG. 3 in the arrangement of the preferred guide G, the curved plate material P2 is lowered one by one to the left and right sides of the upper roller R1 and the lower roller at the center of the basic curvature formed by the curved plate material P2. Install the guides (G) one by one in contact with the site.

After forming the thermal expansion preventing wrinkles (W) in the curved plate (P2), the ends of the curved plate (P2) to be abutted and welded and fixed, the bent curved plate (P2) has a diameter of the upper end and the lower end Different taper shapes are achieved.

On the other hand, the upper roller and the lower roller used in the upper inner mold forming step and the lower inner mold forming step is installed to be movable so as to form a plurality of wrinkles for thermal expansion in order.

Next, there is an inner assembly step (III) of combining the upper inner body 21a and the lower inner body 21b manufactured by the upper inner molding step (I) and the lower inner molding step (II). (21a) and the lower inner body 21b to be welded to each other. When the upper body 21a and the lower body 21b are combined in this way, the basic outline of the inner liner body 21 is completed.

More preferably, the heat treatment step is performed after the inner body assembly step (III), and the heat treatment step is for improving the metal structure, and may be quenched after heating to a high temperature. The heat treatment conditions may be found according to the material of the plate constituting the inner body.

In particular, in performing the heat treatment step, the inner body is inverted and the upper body is disposed downward so that the heat treatment is suitable. Since the upper body is heavier than the lower body, the upper body should come downward to minimize deformation during high temperature heat treatment.

The innerliner inner body manufacturing method according to the present invention has the effect of enabling the inner molding using a plate material to supply the inner body at a quick and low cost.

And according to the present invention there is an effect that can be easily solved the problem that the body is easily damaged because the inner body is provided with a plurality of wrinkles for thermal expansion.

In addition, if the present invention can be produced in a large amount of the inner liner used in power generation equipment, etc., as well as domestic demand and export is expected to have a high added value.

Claims (5)

The inner fabrication method of the inner liner, which is connected to the upper part of the induction casing to supply hot gas to the gas turbine used in the power generation equipment, has an inner and outer dual structure. An upper internal molding step of supplying a rectangular plate between the upper roller and the lower roller to form wrinkles for preventing thermal expansion at equal intervals, and then bending and welding the sheet to form a circle; The curved curved sheet material is supplied between the upper roller and the lower roller to form left and right symmetry, thereby forming a curved shape for preventing thermal expansion in the form of equal intervals, and by arranging a guide for rolling motion at the inlet and the outlet. A lower inner body forming step of forming a corrugation for preventing thermal expansion by moving the curved sheet material in the same direction as the curvature, and then bending and welding the tapered form so that both ends thereof are in contact with each other; The inner liner inner body manufacturing method comprising a; inner body assembly step of welding the upper body and the lower body produced by the inner body forming step and the lower body forming step. The method of claim 1, The inner liner inner manufacturing method, After the inner assembly step, the inner liner inner production method further comprising a heat treatment step for improving the structure by heating and cooling. The method of claim 2, The heat treatment step, The inner liner inner body manufacturing method characterized in that the heat treatment in the upside down state so that the upper body facing downward. The method according to any one of claims 1 to 3, The upper roller and the lower roller, The inner liner inner body manufacturing method characterized in that to move to the left and right to form a neighboring thermal expansion wrinkle. The method of claim 4, wherein The upper roller is provided with two protrusions, the lower roller is formed to form a wrinkle for preventing the thermal expansion on the rectangular plate or curved plate material is inserted into the two grooves corresponding to the protrusion, In the first process, make two thermal expansion wrinkles at once, The inner liner inner fabric manufacturing method characterized in that for forming the thermal expansion prevention wrinkles one by one on the basis of any one of the first thermal expansion prevention wrinkles for processing.

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