Apparatus for Simultaneous Pressing and Heating of Four Straight Roebel Bar Pre-assemblies

Abstract

The present invention relates to a device capable of simultaneously pressurizing and heating four Robelbar pre-assemblies during the first pressurizing and heating step of a Robelbar manufacturing process. By newly developing a compression jig part for compressing four Robelbar pre-assemblies, the invention can resolve bottlenecks occurring in the Robelbar production process, thereby improving Robelbar productivity and shortening the overall process time.

Description

Technology Field

[0001] The present invention relates to a device capable of simultaneously pressurizing and heating four Robelbar pre-assemblies during the primary pressurizing and heating stage when manufacturing a Robelbar, which is a type of stator winding of a generator. Background Technology

[0002] Power plants are equipped with generators, which generate electricity by utilizing heat produced by nuclear fission, heat generated by burning fuels such as oil or coal, or the kinetic energy of water such as hydropower or tidal power.

[0003] A generator is a device that converts mechanical energy into electrical energy, and its basic principle is to generate electromotive force using electromagnetic induction. For example, if a coil is placed between two magnets and rotated, a change in the magnetic field occurs within the coil. At this time, an induced electromotive force is generated at both ends of the coil, causing an induced current to flow. The current generated in this way is alternating current, which changes periodically in both strength and direction.

[0004] Specifically, a generator generates electricity by using the rotational force of a turbine, which rotates due to water or steam, to rotate the generator's rotor at high speed.

[0005] The stator winding of a large generator is a winding structure formed by electrically connecting multiple stator coils or conductors installed in the slots of the generator stator, generating an induced electromotive force by linking with the magnetic flux produced by the rotating magnetic field of the rotor, and forming a conductive path through which the generated current flows. In addition, the stator winding is configured to have a predetermined electrical dielectric strength by laminating insulating materials, such as mica-based insulating tape, on the outer side of the conductors so as to withstand the rated voltage of the generator and overvoltage that may occur during operation.

[0006] FIG. 10 is a schematic diagram showing the configuration of a general generator. A stator (2) consisting of stator coils (3) is installed on the inner outer edge of an iron core, and a rotor (4) consisting of an electromagnet or magnet corresponding to the stator coils (3) is installed on a rotating shaft (5) positioned to penetrate the center of the iron core.

[0007] Accordingly, as the rotating shaft (5) rotates, the rotor (4) installed on the rotating shaft (5) rotates at high speed, and the magnetic flux generated from the rotor (4) links with the outer stator coil (3), and current flows through the stator coil (3) due to the electromagnetic force generated at this time, thereby generating electricity.

[0008] Among these, the stator (2) is configured to prevent damage, such as breakage of the coil due to electric discharge, by providing an insulating material outside the stator coil (3), which is composed of a plurality of coils. The insulating material includes a thermosetting resin, mica, etc., and a corona prevention tape, etc., is wound on the outer side of the insulating material to prevent discharge.

[0009] When classifying the stator windings of a generator, they are divided into amorphous windings (random-wound, random winding) for low voltage of 1 MW or less and formed windings (form-wound, or formed winding) for high voltage of over 1 MW, and formed windings are further divided into diamond shape for less than 50 MW and Roebel Bar for over 50 MW.

[0010] The Roebel bar, which is the subject of the present invention, is a stator winding developed by Ludwig Roebel of Germany, in which multiple insulated conductor strands are stacked to form a stack, and in order to prevent unwanted heat generation problems caused by unnecessary circulating current flowing due to the difference in induced electromotive force between each conductor strand, the position of each conductor strand is transposed and arranged so as to periodically change along the length direction of the bar. It is a conductor for the stator winding of a generator or large rotating electric machine.

[0012] The manufacturing process of Robelva is largely carried out in the following order.

[0013] (1) Robelva pre-assembly manufacturing stage

[0014] A Lovelbar preassembly is manufactured comprising a plurality of stacks in which a plurality of conductor wires arranged in a potential are stacked, an insulating strip member interposed between the plurality of stacks, and an internal corona prevention member disposed at each of the potential portions at the top and bottom of the stacks.

[0015] (2) Primary pressurization and heating step

[0016] An integrated Robelbar molded body is manufactured by pressurizing and heating a Robelbar pre-assembly, wherein a plurality of stacks are joined together by the insulating strip member and the internal corona prevention member fills the empty space of the dislocation part.

[0017] That is, the insulating strip member (Separator) plays a role in maintaining the shape of the Robelbar after cooling, as the resin is squeezed out by pressurized heating and the stacks are joined together.

[0018] In addition, the Inner Corona Protection (ICP) material (such as Black mastic) spreads out through pressurized heating and fills the empty spaces in the dislocation area.

[0019] The integrated Robelbar molded body produced by the first pressurization and heating step in this way is in a straight shape.

[0020] FIG. 11 is a photograph showing the state of primary pressurization and heating of two Robelbar pre-assemblies (10) in the prior art, and FIG. 12 is a perspective view of an integrated Robelbar molded body (20) manufactured by the primary pressurization and heating step.

[0021] (3) End forming step

[0022] The ends of the straight-shaped integrated love bar molded body are bent and formed so that the love bar has a shape consisting of a straight section extending in a straight line and end sections extending by bending at both ends in the longitudinal direction of the straight section.

[0023] (4) Main insulation tape and OCP taping step

[0024] After the end forming step, the main insulation tape and outer corona protection (OCP) tape are wrapped around the lobule.

[0025] The main insulation tape is applied to the entire Robelbar excluding the connection part, and after the main insulation tape is applied, the outer corona protection tape is applied to the straight part of the Robelbar.

[0026] (5) Secondary pressurization and heating step

[0027] A Robelbar wrapped with a main insulating tape and an outer corona prevention tape is pressurized and heated to form an outer corona prevention layer, and the resin of the main insulating tape is squeezed out to fill the empty space while simultaneously allowing the insulating materials to adhere to the Robelbar.

[0028] The final dimensions and shape of the Robelbar are determined by the second pressurization and heating step.

[0029] (6) ECP formation stage

[0030] End Corona Protection (ECP) tape is wrapped around the end of the Robelba and heat-treated to form an end corona protection layer.

[0032] The present invention relates to the first pressurization and heating step among the above steps.

[0033] Conventionally, for the primary pressurization and heating of the Robelbar pre-assemblies, two Robelbar pre-assemblies were arranged vertically in a compression jig to perform the primary pressurization and heating operation.

[0034] However, the step of first pressurizing and heating two Lobelva preassemblies per cycle in this manner caused a bottleneck in the overall production process, which became a factor in reducing production efficiency.

[0035] In addition, the configuration of arranging the Robelbar pre-assemblies in the vertical direction has the problem that the overall device must become excessively large when the number of Robelbar pre-assemblies to be pressurized and heated is to be increased. Prior art literature

[0036] Registered Patent No. 10-2268609 "Equipment for manufacturing an integrated high-compression stator coil for a high-voltage generator" (Registered June 17, 2021) Registered Patent No. 10-2268610 "Method for manufacturing an integrated high-compression stator coil for a high-voltage generator" (Registered June 17, 2021) The problem to be solved

[0037] The present invention was devised to solve the problems of the prior art as described above, and aims to provide a device for simultaneously pressurizing and heating four straight-shaped Robelbar pre-assemblies that can improve productivity by simultaneously pressurizing and heating four Robelbar pre-assemblies. means of solving the problem

[0038] To solve the above problem, the present invention relates to an apparatus for the simultaneous pressurization and heating of four linear Lobelbar preassemblies, comprising: a plurality of stacks in which a plurality of conductor wires arranged in a potential arrangement are stacked, an insulating strip member interposed between the plurality of stacks, and an internal corona prevention member disposed at each of the potential portions of the upper and lower parts of the stacks, wherein: a base frame; A main jig for lower vertical compression in the form of a horizontal plate; a pair of horizontal compression jigs in the form of vertical plates disposed on both sides of the upper surface of the main jig for lower vertical compression; four auxiliary jigs for lower vertical compression in the form of vertical plates disposed on the upper surface of the main jig for lower vertical compression and spaced apart from each other between the pair of horizontal compression jigs; four auxiliary jigs for upper vertical compression in the form of vertical plates disposed spaced upward from the auxiliary jigs for lower vertical compression to compress four Robelbar pre-assemblies disposed on the upper surface of each of the four auxiliary jigs for lower vertical compression from above; three horizontal spacers in the form of vertical plates disposed on the upper surface of the main jig for lower vertical compression and disposed between an adjacent pair of auxiliary jigs for lower vertical compression, between an adjacent pair of auxiliary jigs for Robelbar pre-assemblies, and between an adjacent pair of auxiliary jigs for upper vertical compression; and a horizontal plate in the form of a horizontal plate and in the width direction A compression jig section comprising an upper vertical compression main jig having both ends positioned on the upper portion of the pair of horizontal compression jigs to press the four upper vertical compression auxiliary jigs; and a plurality of compression heating devices arranged in a row along the longitudinal direction of the compression jig section on the base frame, wherein a compression heating processing space is formed through which the compression jig section penetrates, for pressing and heating the compression jig section in the horizontal and vertical directions. Effects of the invention

[0039] As described above, the present invention can improve the productivity of the Robelbar and shorten the overall process time by simultaneously pressurizing and heating four Robelbar preassemblies to eliminate bottlenecks occurring in the Robelbar production process. Brief explanation of the drawing

[0041] FIG. 1 is a perspective view of a device for simultaneous pressurization and heating of four lobel bars according to an embodiment of the present invention. FIG. 2 is a front view of FIG. 1, FIG. 3 is a plan view of FIG. 1, FIG. 4 is a side view of FIG. 1, FIG. 5 is a perspective view of the compression jig part of FIG. 1, FIG. 6 is an exploded perspective view of FIG. 5. FIG. 7 is a conceptual cross-sectional view illustrating the state in which a Robelva-jig assembly is pressurized and heated in the pressurized heating device of FIG. 1. FIG. 8 is a conceptual cross-sectional view of the Lovelva-Jig assembly of FIG. 7, FIG. 9 is a photograph showing the state in which four Lobelva preassemblies are simultaneously pressurized and heated in the device. FIG. 10 is a schematic diagram showing the configuration of a typical generator, FIG. 11 is a photograph showing the state of primary pressurization and heating of two Lobelva preassemblies in the prior art. FIG. 12 is a perspective view of an integrated Lobelva molded body manufactured by a first pressurization and heating step. Specific details for implementing the invention

[0042] Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification have been given similar reference numerals.

[0043] Throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0044] FIG. 1 is a perspective view of a device for simultaneous pressurization and heating of four Robelbars according to an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a top view of FIG. 1, FIG. 4 is a side view of FIG. 1, FIG. 5 is a perspective view of a compression jig part of FIG. 1, FIG. 6 is an exploded perspective view of FIG. 5, FIG. 7 is a conceptual cross-sectional view illustrating the state in which a Robelbar-jig assembly is pressurized and heated in the pressurization and heating device of FIG. 1, FIG. 8 is a conceptual cross-sectional view of the Robelbar-jig assembly of FIG. 7, and FIG. 9 is a photograph taken of the state in which four Robelbar pre-assemblies are simultaneously pressurized and heated in the device.

[0045] In FIGS. 1 to 6, the Robelva pre-assembly (10) is not shown.

[0046] This device is intended to simultaneously pressurize and heat four straight-shaped Robelbar pre-assemblies (10).

[0047] In order to separate the compression jig part (300) from the integrated Robelbar molded body (20) after pressurizing and heating the Robelbar pre-assembly (10), the Robelbar pre-assembly (10) is mounted on the compression jig part while wrapped in a release film, and after the pressurization and heating treatment is completed, the compression jig part is separated and the release film is removed.

[0048] In this device, four straight-shaped Robelbar pre-assemblies (10) are arranged in a spaced-apart state in the horizontal direction.

[0049] A device for simultaneously pressurizing and heating four lobel bars according to the present embodiment is described below.

[0050] The device is composed of a base frame (100), a plurality of pressure heating devices (200), a compression jig part (300), etc.

[0051] As shown in FIGS. 1 to 4, a base frame (100) is provided. A plurality of pressurized heating devices (200) are provided on the base frame (100).

[0052] That is, a plurality of pressure heating devices (200) are arranged in a row along the longitudinal direction on the upper surface of the base frame (100).

[0053] The pressure heating device (200) is a type of press device for applying pressure and heating in the horizontal and vertical directions to a Robelbar-jig assembly in which a plurality of Robelbar pre-assemblies (10) are mounted on a compression jig part (300) described later. However, the pressure heating device (200) is equipped with means for heating as well as pressure.

[0054] A pressurized heating device (200) is described with reference to FIGS. 1 to 4 and FIG. 7.

[0055] A pressurized heating processing space (202) is formed in the central part of the pressurized heating device (200) so that a compression jig part (300) is positioned to pass through it.

[0056] In the pressurized heating processing space (202) of the pressurized heating device (200), a vertical moving pressure plate (211) of a vertical pressure cylinder (210), a horizontal moving pressure plate (221) of a horizontal pressure cylinder (220), a lower support block (231), a lower heating block (232), an upper heating block (233), a horizontal fixed pressure plate (241), etc. are provided.

[0057] The vertical moving pressure plate (211) can move vertically by driving the vertical pressure cylinder (210) and can move downward to press the compression jig part (300) vertically.

[0058] The horizontal moving pressure plate (221) can move horizontally by driving the horizontal pressure cylinder (220) and can press the compression jig part (300) horizontally.

[0059] The horizontal moving pressure plate (221) and the horizontal fixed pressure plate (241) have a heater built inside, and the compression jig part (300) can be heated by driving the built-in heater.

[0060] In addition, the vertical moving pressure plate (211) and the lower support block (231) do not have a heater built inside, and an upper heating block (233) and a lower heating block (232) are placed on the upper and lower parts of the compression jig part (300) respectively to heat the compression jig part (300).

[0061] The configuration of the pressurized heating device (200) as described above can be applied in a wide variety of forms, and this embodiment is merely one example.

[0062] A compression jig (300) is positioned to penetrate the pressure heating processing space (201) of a plurality of pressure heating devices (200).

[0063] As illustrated in FIGS. 5 to 9, the compression jig section (300) forms a lobule-jig assembly together with four lobule pre-assemblies (10), and the compression jig section (300) is composed of one lower vertical compression main jig (311), one upper vertical compression main jig (312), two horizontal compression jigs (313), four lower vertical compression auxiliary jigs (314), four upper vertical compression auxiliary jigs (315), three horizontal spacers (316), etc.

[0064] The main jig (311) for lower vertical compression is a jig located at the very bottom in the form of a horizontal plate.

[0065] A pair of horizontal compression jigs (313), four auxiliary jigs (314) for lower vertical compression, and three horizontal spacers (316) are placed on the upper surface of the main jig (311) for lower vertical compression.

[0066] A pair of horizontal compression jigs (313) are arranged in the form of vertical plates on both sides of the upper surface of the lower vertical compression main jig (311).

[0067] Four auxiliary jigs (314) for lower vertical compression are in the form of vertical plates and are placed on the upper surface of the main jig (311) for lower vertical compression, spaced apart from each other between a pair of horizontal compression jigs (313).

[0068] A Robelbar pre-assembly (10) is placed directly above each lower vertical compression auxiliary jig (314), and an upper vertical compression auxiliary jig (315) is placed directly above the Robelbar pre-assembly (10).

[0069] That is, the upper vertical compression auxiliary jig (315) is positioned spaced upward from the lower vertical compression auxiliary jig (314), and a Robelba pre-assembly (10) is positioned between the upper vertical compression auxiliary jig (315) and the lower vertical compression auxiliary jig (314).

[0070] That is, four Robelbar pre-assemblies (10) extending in a straight line are each placed on the upper part of a lower vertical compression auxiliary jig (314), and four upper vertical compression auxiliary jigs (315) are each placed on the upper part of the Robelbar pre-assemblies (10) in the form of vertical plates so that each Robelbar pre-assembly (10) can be compressed from the upper part.

[0071] Therefore, the number of Robelba pre-assemblies (10), the number of lower vertical compression auxiliary jigs (314), and the number of upper vertical compression auxiliary jigs (315) are the same.

[0072] A horizontal spacer (316) is placed between a pair of adjacent lower vertical compression auxiliary jigs (314), a pair of adjacent Robelba pre-assemblies (10), and a pair of adjacent upper vertical compression auxiliary jigs (315).

[0073] That is, three horizontal spacers (316) are provided, and each horizontal spacer (316) is in the form of a vertical plate placed on the upper surface of the main jig (311) for lower vertical compression and is placed between a pair of adjacent auxiliary jigs (314) for lower vertical compression, between a pair of adjacent Robelbar pre-assemblies (10), and between a pair of adjacent auxiliary jigs (315) for upper vertical compression.

[0074] The upper vertical compression main jig (312) is a jig located at the very top in the form of a horizontal plate.

[0075] The upper vertical compression main jig (312) has a structure in which both ends in the width direction are positioned above a pair of horizontal compression jigs (313) to press four upper vertical compression auxiliary jigs (315).

[0076] In this way, the compression jig part (300) is configured such that four Robelbar pre-assemblies (10) are mounted spaced apart from each other in the horizontal direction in order to compress four Robelbar pre-assemblies (10) simultaneously.

[0077] That is, when the lower vertical compression main jig (311) and the upper vertical compression main jig (312) receive vertical pressure, the Robelbar pre-assembly (10) is compressed vertically between the lower vertical compression auxiliary jig (314) and the upper vertical compression auxiliary jig (315), and when a pair of horizontal compression jigs (313) receive horizontal pressure, the Robelbar pre-assembly (10) is compressed horizontally between the horizontal spacers (316) or between the horizontal spacers (316) and the horizontal compression jig (313).

[0079] The operation of the present invention as described above is explained.

[0080] In this embodiment, four Robelbar pre-assemblies (10) are arranged in a compression jig section (300) in a horizontally spaced manner to form a Robelbar-jig assembly, and the Robelbar-jig assembly is introduced into a pressure heating processing space (202) of a pressure heating device (200) and pressured and heated.

[0081] Four Robelbar pre-assemblies (10) wrapped in a compression jig (300) are pressurized and heated by a plurality of pressure heating devices (200).

[0082] By the above-mentioned pressurization and heat treatment, four Robelbar pre-assemblies (10) are manufactured into four integrated Robelbar molded bodies (20) in which a plurality of stacks are joined together by an insulating strip member and an internal corona prevention member fills the empty space of the dislocation part.

[0084] By the above-mentioned pressurization and heating treatment, the device can simultaneously pressurize and heat four straight-shaped lobel bar pre-assemblies (10), thereby greatly increasing the production efficiency of the first pressurization and heating stage of the lobel bar, which causes a bottleneck in the entire process.

[0086] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art may implement the present invention in various forms. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.

[0087] The scope of the present invention is defined by the claims set forth below. Explanation of the symbols

[0088] 10 : Robelva pre-assembly 20 : Integrated Robelva molded body 100 : Base frame 200 : Pressurized heating device 202 : Pressurized heating processing space 210: Vertical pressure cylinder 211: Vertical movable pressure plate 220: Horizontal pressure cylinder 221: Horizontal movable pressure plate 231: Lower support block 232: Lower heating block 233: Upper heating block 241: Horizontal fixed pressure plate 300: Crimping jig part 311: Main jig for lower vertical compression 312: Main jig for upper vertical compression 313: Horizontal crimping jig 314: Auxiliary jig for lower vertical compression 315: Auxiliary jig for upper vertical compression 316: Horizontal spacer

Claims

Claim 1 An apparatus for the simultaneous pressurization and heating of four linear-shaped Robelbar preassemblies comprising: a plurality of stacks having multiple conductor wires arranged in a potential arrangement, an insulating strip member interposed between the plurality of stacks, and an internal corona prevention member disposed at each of the upper and lower potential portions of the stacks; wherein: a base frame; a main jig for lower vertical compression in the form of a horizontal plate; a pair of horizontal compression jigs in the form of vertical plates disposed on both sides of the upper surface of the main jig for lower vertical compression; four auxiliary jigs for lower vertical compression in the form of vertical plates disposed on the upper surface of the main jig for lower vertical compression and spaced apart from each other between the pair of horizontal compression jigs; four auxiliary jigs for upper vertical compression in the form of vertical plates disposed spaced upward from the auxiliary jigs for lower vertical compression to compress four Robelbar preassemblies disposed on the upper surface of each of the four auxiliary jigs for lower vertical compression from the upper surface; and a member disposed on the upper surface of the main jig for lower vertical compression. A device for simultaneous pressurization and heating of four straight-shaped Robelbar preassemblies, characterized by comprising: a pressurization jig section including three horizontal spacers in the form of vertical plates disposed between a pair of adjacent lower vertical pressurization auxiliary jigs, between a pair of adjacent Robelbar preassemblies, and between a pair of adjacent upper vertical pressurization auxiliary jigs, and an upper vertical pressurization main jig in the form of a horizontal plate with both ends in the width direction disposed above the pair of horizontal pressurization jigs to pressurize the four upper vertical pressurization auxiliary jigs; and a plurality of pressurization and heating devices arranged in a row along the longitudinal direction of the pressurization jig section on a base frame, wherein a pressurization and heating processing space is formed through which the pressurization jig section penetrates, for pressurizing and heating the pressurization jig section in the horizontal and vertical directions.

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