Iron core protective case, amorphous iron core molded transformer, and method for manufacturing the same.
The U-shaped core protection case with dedicated lifting jigs and reinforcing stays stabilizes amorphous cores, simplifying assembly and reducing deformation risks, enhancing manufacturing efficiency.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- HITACHI IND EQUIP SYST CO LTD
- Filing Date
- 2023-10-20
- Publication Date
- 2026-07-30
AI Technical Summary
Amorphous cores in transformers lack sufficient rigidity to stand on their own, requiring complex assembly methods that involve inverting the core with a coil, and existing protection cases risk deformation during lifting.
A core protection case with a U-shaped design and suspension holes, allowing the core to be self-supporting and preventing deformation during handling by using dedicated lifting jigs and reinforcing stays.
Enables stable, deformation-free handling and assembly of amorphous cores, reducing the need for complex machinery and minimizing manufacturing time and damage risks.
Smart Images
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Figure 0007897831000003
Abstract
Description
Technical Field
[0001] The present invention relates to a core protection case, an amorphous core molded transformer, and a method for manufacturing the same.
Background Art
[0002] Patent Document 1 discloses "a molded transformer including a coil and a core made of an amorphous material, wherein the core is provided with a core protection case, and the core protection case has an upper piece provided with a hole, and is characterized in that it is an amorphous core molded transformer".
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] The amorphous material of the core material itself is thin, and the core manufactured by laminating the amorphous materials does not have sufficient rigidity to stand on its own. Therefore, conventionally, in an amorphous core molded transformer, the core is inserted from above a highly rigid coil molded with resin, and the shape is maintained by the core being placed on the coil. However, in this assembly method, the wrapped portion of the core is located below the coil, and it is necessary to close the wrapped portion after once laying the coil and the core horizontally. Therefore, an apparatus for inverting the core with the coil inserted is required for the assembly work.
[0005] In Patent Document 1, by attaching a U-shaped core protection case with a U-shaped cross section along the U-shaped amorphous wound core before wrapping, the amorphous wound core stands on its own with the wrapped portion facing up, and it becomes possible to insert the coil from above and close the wrapped portion at the upper part, eliminating the need to invert the core with the coil inserted.
[0006] However, although the upper piece of the U-shaped outer side surface of the core protection case in Patent Document 1 is provided with a suspension hole for standing upright and for moving in the upright position, if the case is lifted using suspension holes on upper pieces of U-shaped outer sides that are far apart, movement in the upright position is unstable, and there is a risk that the core protection case may deform due to bending or twisting.
[0007] The present invention aims to provide an iron core protection case, an amorphous iron core transformer, and a method for manufacturing the same, which can protect an amorphous iron core without deformation during lifting and without damaging the core. [Means for solving the problem]
[0008] The core protection case according to the present invention is a core protection case that is placed over a wound core, and the core protection case is composed of a first portion having a tip that covers one end of the lap portion of the wound core that is lap-joined, a second portion having a tip that covers the other end of the other end, and a third portion that connects the first portion and the second portion, and each tip of the first portion and the second portion opposite to the third portion is formed by a first surface which is the outer side surface of the core protection case and a second surface which extends from the first surface at a predetermined angle, and the second surface is provided with a hole for attaching a suspension jig which is connected to the lap portion. [Effects of the Invention]
[0009] According to the present invention, the amorphous iron core can be protected without deformation during lifting and without damage. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments for carrying out the invention. [Brief explanation of the drawing]
[0010] [Figure 1] Overall view of the core protection case in this embodiment [Figure 2]Diagram illustrating the amorphous iron core, the iron core protective case before installation, and the wrap cover in this embodiment. [Figure 3] Diagram illustrating the amorphous iron core and insulating plate after the iron core protection case and wrap cover are attached in this embodiment. [Figure 4] Diagram showing the inversion process of the amorphous iron core after the iron core protection case and wrap cover have been attached in this embodiment. [Figure 5] Diagram illustrating the amorphous iron core and dedicated lifting jig for the wrap section after the iron core protective case and wrap section cover have been attached in this embodiment. [Figure 6] Lifting diagram of the amorphous iron core in a lateral position after the iron core protection case and wrap cover have been attached in this embodiment. [Figure 7] This embodiment shows the self-supporting state of the amorphous iron core after the iron core protection case and wrap section cover have been attached, and a diagram illustrating the process of attaching a jig to hold the wrap section upright when inserting a coil. [Figure 8] Diagram illustrating the process of inserting a coil into the amorphous iron core after the iron core protection case and wrap cover have been attached in this embodiment. [Modes for carrying out the invention]
[0011] Hereinafter, an embodiment applying the amorphous iron core molded transformer and its manufacturing method according to the present invention will be described with reference to the drawings.
[0012] Figure 1 shows the core protection case 3 before assembly in this embodiment. As shown in Figure 1, the core protection case 3 has round holes 31 through which bolts for attaching a dedicated lifting jig 7 for the lap section pass, a lifting hole 32 for lifting the third part 3c side of the core protection case 3 for attaching the dedicated lifting jig 7 for the lap section and moving it to a predetermined assembly position, an extension 33 which is the part that is longer than the lower surface of the amorphous core 2, which is a wound core that is laid on its side when attached to the core protection case 3, and a reinforcing stay 34 to prevent the amorphous core 2 from opening outwards together with the core protection case 3 due to its own weight when in a vertical state in which the lap section 21 to be lap-joined is located above the third part 3c.
[0013] The core protection case 3 is a case that is enclosed on three sides by a first part 3a that forms a first side, a second part 3b that forms a second side parallel to the first side, and a third part 3c that connects the end of the first part 3a and the end of the second part 3b that is opposite to the first part 3a, forming a so-called "U" shape. The tip E1 of the first part 3a that is not connected to the third part 3c and the tip E2 of the second part 3b that is not connected to the third part 3c are spaced apart, forming the open region R in the aforementioned "U" shape.
[0014] The first part 3a has a first surface 30a that forms the outer side of the core protection case 3, an inner side 30b of the core protection case 3, and a second surface 30c that connects the first surface 30a and the inner side 30b, and is enclosed on three sides by these surfaces, forming a so-called "U" shape like the Japanese katakana character. The second part 3b and the third part 3c are also formed in the same U shape as the first part 3a. In other words, each of the first part 3a, the second part 3b, and the third part 3c is formed by a first surface 30a and an inner side 30b that are parallel to the direction in which the core protection case 3 is placed over the amorphous core 2, and a second surface 30c that is perpendicular to the direction in which the core protection case 3 is placed (horizontal in the sideways state described later). The lower side in the direction in which the core protection case 3 is placed is open, forming a U shape, and the amorphous core 2 is covered and protected. In Figure 1, the orientation of these surfaces is shown by dotted lines.
[0015] The iron core protection case 3 is provided with suspension holes 32 at both longitudinal ends of the third part 3c. Specifically, the suspension holes 32 are provided at two locations on the first surface 30a at both ends in the connecting direction that connects the first part 3a and the second part 3b in the third part 3c, and are provided on a surface different from the second surface 30c where the round hole 31 of the iron core protection case 3 is provided. As will be described later, the suspension hole 32 is configured as a hole that is used for both the lifting on the third part 3c side for attaching the dedicated lifting jig 7 for the wrap part and the lifting in the state where the iron core protection case 3 is lying on its side by the suspension hole 72 of the dedicated lifting jig 7 for the wrap part. By the suspension hole 32, the third part 3c side of the iron core protection case 3 can be lifted, and it can be easily reversed front and back in the vertical state with the suspension hole 32 facing upward.
[0016] The first part 3a and the second part 3b of the iron core protection case 3 have tip parts 23a, 23b (Fig. 2) formed by the first surface 30a and the second surface 30c at the tip parts on the side opposite to the third part 3c side. The second surface 30c is a surface that extends from the first surface 30a at a predetermined angle (in this example, 90 degrees). The tip parts 23a, 23b have notch parts 24a, 24b with lengths corresponding to the width of the wrap part 21 to be lap-joined. The notch parts 24a, 24b can be formed by making the length in the longitudinal direction (the direction perpendicular to the connecting direction) of the inner side surface 30b of the first part 3a and the second part 3b shorter than the first surface 30a and the second surface 30c. When both ends of the wrap part 21 enter the notch parts 24a, 24b, the tip parts 23a, 23b can cover both ends of the wrap part 21.
[0017] The round hole 31 for attaching the dedicated lifting jig 7 for the wrap part is provided on the tip side of the second surface 30c of the tip parts 23a, 23b, at a position outside the center of the second surface 30c (for example, at the position where it becomes the boundary with the first surface 30a). Since the round hole 31 is provided on the tip side of the second surface 30c and outside the center, the wrap part 21 of the amorphous iron core 2 and the round hole 31 of the iron core protection case 3 do not overlap, and the dedicated lifting jig 7 for the wrap part can be easily attached to the iron core protection case 3.
[0018] Thus, the core protection case 3 in this embodiment is composed of a first part 3a having a tip part 23a covering one end of both ends of the wrap part 21 of the amorphous core 2, a second part 3b having a tip part 23b covering the other end of both ends, and a third part 3c connecting the first part 3a and the second part 3b. Each tip part on the side opposite to the third part 3c side of the first part 3a and the second part 3b is formed by a first surface 30a which is the outer side surface of the core protection case 3 and a second surface 30c extending at a predetermined angle (in this example, 90 degrees) from the first surface. A round hole 31 for attaching a wrap part dedicated lifting jig 7 connected to the wrap part 21 is provided in the second surface 30c.
[0019] Figure 2 is an explanatory view of the amorphous core and the core protection case before assembly in this embodiment. The operation of attaching the core protection case 3 to the amorphous core 2 of this embodiment will be described. First, as shown in Figure 2, the heat-treated amorphous core 2 is placed on the spacer 5 in a lying-down state. At this time, the spacer 5 is arranged avoiding the extension part 33 of the core protection case 3. The extension part 33 is a convex part formed to protrude in the covering direction on the first part 3a, the second part 3b, and the third part 3c of the core protection case 3. That is, the core protection case 3 mounted on the heat-treated amorphous core 2 in a lying-down state has a thickness sufficient to surround up to the lower surface of the amorphous core 2 in the covering direction at the part where the spacer 5 supporting the amorphous core 2 is arranged. On the other hand, at the part where the spacer 5 is not arranged, it has a further thickness in the covering direction by a predetermined width considering its own weight than the lower surface of the core at the part where the spacer 5 is arranged.
[0020] Due to this convex shape, the amorphous iron core 2 is surrounded and protected up to the bottom surface in the covering direction, including the portion where deflection occurs due to the amorphous iron core 2's own weight. This allows the amorphous iron core 2 to be placed in a stable position while being covered so that it does not protrude from the iron core protection case 3 due to deflection due to its own weight. As shown in Figure 2, the extension portion 33 is formed on the first surface 30a and the inner side surface 30b of the first portion 3a, the second portion 3b, and the third portion 3c, respectively. The iron core protection case 3 is attached to the amorphous iron core 2 such that the tip E1 of the first portion 3a and the tip E2 of the second portion 3b are on the overlap portion 21 side of the amorphous iron core 2.
[0021] The amorphous iron core 2 is wrapped with insulating paper up to the insulating wrapping boundary line 22, except for the overlapping portion 21 of the amorphous iron core 2, for insulation and protection. When the amorphous iron core 2 is placed on the splint 5, (1) first, the overlapping portion cover 4 is placed over the overlapping portion 21, and then (2) the iron core protective case 3 is placed over it. Then, (3) the overlapping portion 21, along with the overlapping portion cover 4, is wrapped multiple times with tape or a band that has sufficient tensile strength to secure it.
[0022] Next, (4) as shown in Figure 3, insert the insulating plate 6 into the extension 33 of the core protection case 3 from below, in the opposite direction to the covering direction, between the splints 5, and apply it to the lower surface of the amorphous core 2 that is not in contact with the splint 5 on the lower side of the amorphous core 2 that is placed on the splint 5. The number of insulating plates 6 will vary depending on the dimensions of the amorphous core 2. Then, (5) the portion of the amorphous core 2 with the insulating plate 6 applied to it, along with the core protection case 3, is secured by wrapping it multiple times with tape or a band that has sufficient tensile strength.
[0023] Furthermore, in order to attach the dedicated lifting jig 7 for the wrap section, (6) as shown in Figure 4, a reversing device (not shown) passes a wire through the lifting hole 32 of the core protection case 3, which has been fixed by the procedure up to (5) above, lifts it up 90 degrees vertically so that the side with the lifting hole 32 is facing upward, and then rotates it horizontally 180 degrees HR using a lifting device such as a crane. Then, (7) the reversing device again lifts the rotated core protection case 3 and returns it to the sideways state shown in Figure 5, which is the opposite of the state shown in Figure 3.
[0024] Then, as shown in Figure 5 (8), the lap section-specific suspension jig 7 is placed over the amorphous iron core 2, along with the lap section cover 4, from the lap section 21 side of the amorphous iron core 2. When attaching, the position of the round holes 31 on the tip side of the tip sections 23a and 23b of the iron core protection case 3 is aligned with the bolt holes 71 of the lap section-specific suspension jig 7, and the lap section-specific suspension jig 7 is physically fixed with bolts and nuts to attach it to the iron core protection case 3.
[0025] (9) When moving the amorphous core 2 with the core protection case 3 attached to the predetermined assembly position, as shown in Figure 6, the core is lifted by wires at a total of four points: the two lifting holes 32 of the core protection case 3 and the two lifting holes 72 of the lifting jig for the lap section, while the core is lying on its side. In this way, the lifting holes 32 are used for both the lifting in (6) and (9) above, so the number of holes in the core protection case 3 can be reduced, and lifting can be performed while maintaining a certain level of strength.
[0026] As shown in Figure 6, the dedicated lifting jig 7 for the lap portion, attached to the lap portion 21 of the amorphous core 2, forms a fourth portion 3d parallel to the third portion 3c of the core protection case 3. The open region R formed by the tip E1 of the first portion 3a and the tip E2 of the first portion 3b is closed, forming a new core protection case in the shape of a square. As a result, the lifting holes 32 and the lifting holes 72 of the dedicated lifting jig 7 for the lap portion are positioned on the diagonal of the new core protection case 3. In the new square-shaped core protection case, the dedicated lifting jig 7 for the lap portion is connected to the lap portion 21 by bolts inserted into round holes 31 aligned with the bolt holes 71, thereby covering the amorphous core 2, including the lap portion 21.
[0027] The suspension holes 72 are provided to move the new core protection case 3 described above to a predetermined assembly position and to lift the lap portion 21 after it has been moved to the predetermined assembly position. When the dedicated suspension jig 7 for the lap portion is physically fixed to the core protection case 3, the outer side surface 7a of the new core protection case, which is shaped like a square, is formed. As a result, the suspension holes 32 are provided at positions opposite to the suspension holes 72 provided at both ends in the connecting direction of the outer side surface 7a of the attached dedicated suspension jig 7 for the lap portion. Therefore, a wire can be passed through the suspension holes 72 of the attached dedicated suspension jig 7 for the lap portion and the suspension holes 32 of the core protection case 3, and the core protection case 3 can be lifted horizontally in a balanced manner while lying on its side. The new core protection case 3, to which the dedicated lifting jig 7 for the lap portion is attached, covers the outer surface of the amorphous core 2, including the lap portion 21, with the first surfaces 30a of the first portion 3a, the second portion 3b, and the third portion 3c, and the outer side surface 7a of the fourth portion 3d.
[0028] Figure 6 shows an amorphous core 2 with a core protection case 3 attached in a horizontal position. In this example, the arrangement of the suspension holes 72 and 32 formed at the four diagonal corners of the new core protection case 3, to which the dedicated suspension jig 7 for the lap section is attached, allows the amorphous core 2 covered by the core protection case 3 to be lifted in a horizontal position by passing a wire through the four suspension holes 32 and 72 when moving to a predetermined assembly position. As a result, it can be moved more stably than with two-point suspension in a vertical position, and without causing unnecessary bending or twisting of the core protection case 3.
[0029] Next, the manufacturing method of the amorphous core molded transformer will be described. (11) First, the transformer is lifted by wire using only the two suspension holes 72 of the dedicated suspension jig 7 for the lap section shown in Figure 6, so that the lap section 21 is positioned above the third section 3c. At this time, the reinforcing stay 34 has the role of preventing the amorphous core 2 from opening outwards together with the core protection case 3 due to its own weight. The reinforcing stay 34 is also shaped in a curve that follows the R section (bent section) on the outer layer side of the amorphous core 2. The bent section is the end of the bottom surface formed by the amorphous core 2 in the above-mentioned vertical state covered by the core protection case 3, in the direction of connection.
[0030] As described above, reinforcing stays 34 are provided at the connection points between the first part 3a and the third part 3c, and between the second part 3b and the third part 3c, with a shape that conforms to the shape of the R portion formed on the outer layer side of the amorphous core 2. In Figure 7, the reinforcing stays 34 are provided at the corner C formed by the first surfaces 30a of the first part 3a and the second part 3b, and the first surface 30a of the third part 3c. The reinforcing stays 34 prevent the amorphous core 2 from falling into the corner C of the core protection case 3 due to its own weight. Furthermore, because the reinforcing stays 34 prevent the amorphous core 2 from falling into the corner C due to its own weight, even if it becomes necessary to rotate the suspension hole 32 90 degrees vertically so that the suspension hole 32 is facing upwards, the wire can be easily passed through the suspension hole 32, which is not blocked by the amorphous core 2. Furthermore, because the reinforcing stay 34 is curved to follow the bend, it becomes less likely for creases to form in the amorphous iron core 2, thus preventing damage to the amorphous iron core 2.
[0031] Then, as shown in Figure 7 (12), the dedicated suspension jig 7 for the wrap section connected to the wrap section 21 is removed from the new iron core protection case 3 described above to open the wrap section 21, and the jig 8 for making the wrap section 21 stand upright is placed over the top of the opened wrap section 21, which is the tip side, and then the wrap section cover 4 is temporarily removed.
[0032] Furthermore, (13) as shown in Figure 8, the molded coil 1 to be wound around the amorphous iron core 2 is inserted from above the lapped section 21 covered with the jig 8. Then, (14) the lapped section cover 4 is reattached, the jig 8 that holds the lapped section 21 upright is removed, and the lapped section 21 of the amorphous iron core 2 is closed.
[0033] In this way, the core protection case 3 is placed over the amorphous core 2 except for the lap portion 21, the lap portion-specific lifting jig 7 is placed over the lap portion 21, and the lap portion-specific lifting jig 7 is fixed by aligning the round hole 31 with the bolt hole 71 of the lap portion-specific lifting jig 7 to form a new core protection case 3. Then, the new protection case is lifted using the lifting hole 72 provided in the lap portion-specific lifting jig 7 to a vertical position where the lap portion 21 is positioned above the third portion 3c.
[0034] Specifically, first, a wire is passed through the suspension holes 32 provided at both ends of the first surface 30a of the third part 3c in the direction connecting the first part 3a and the second part 3b, and the core protection case 3 covering the amorphous core 2 is lifted and lowered to a horizontal position. Then, the suspension jig 7 for the lap section is attached to the core protection case 3 by bolts inserted into round holes 31 that are aligned with the bolt holes 71 provided at both ends of the suspension jig 7 in the direction of connection. Furthermore, a wire is attached to the suspension holes 72 provided at both ends of the outer side surface 7a of the attached suspension jig 7 in the direction of connection, and the suspension jig is lifted to a vertical position with the lap section 21 facing upwards.
[0035] Then, the dedicated suspension jig 7 for the lap section is removed to open the lap section 21. From above, which is the tip end of the opened lap section 21, the molded coil 1 to be wound around the amorphous iron core 2 is inserted, and the lap section 21 is closed with the lap section cover 4.
[0036] As described above, according to this embodiment, when manufacturing an amorphous core molded transformer, the amorphous core can be made self-supporting with the overlapping portion positioned at the top by the core protection case, making it possible to overlap the top. Therefore, a large turning machine is not required, and the man-hours required for manufacturing amorphous core molded transformers can be greatly reduced. In addition, even at delivery locations where the transformer body cannot be delivered, it becomes easy to disassemble and deliver the core and coil and assemble them on-site.
[0037] Specifically, as explained using Figure 1-4, etc., in the core protection case (core protection case 3) that is placed over the wound core (amorphous core 2), the core protection case has a first part (first part 3a) having a tip (tip 23a) that covers one end of the lapped portion (lapped portion 21) of the wound core that is lap-joined, a second part (second part 3b) having a tip (tip 23b) that covers the other end of the above two ends, and a connecting part between the first part and the second part The first part and the second part are formed by a first surface (first surface 30a) which is the outer side surface of the core protection case, and a second surface (second surface 30c) which is extended from the first surface at a predetermined angle (for example, 90 degrees). The second surface is provided with a hole (round hole 31) for attaching a lifting jig (lifting jig 7 for the lap section) which is connected to the lap section. With this configuration, for example, the amorphous core 2 can be protected without being damaged, without deformation such as bending or twisting during lifting. In addition, because the round hole 31 is provided on the second surface 30c, the position of the hole can be confirmed when placing the core protection case 3 over the amorphous core 2, making it easy to attach the lifting jig 7 for the lap section.
[0038] Furthermore, the holes are located on the side of the first surface rather than the center of the second surface 30c of each tip. With this configuration, for example, there is no risk of the round hole 31 being blocked by the overlapping portion 21, and the dedicated suspension jig 7 for the overlapping portion can be easily attached to the iron core protective case 3.
[0039] Furthermore, the core protection case is attached to the lifting jig by bolts inserted into holes aligned with bolt holes (bolt holes 71) provided at both ends of the lifting jig in the connecting direction. With this configuration, for example, a lifting jig 7 specifically for the lap portion is connected to the lap portion 21, forming a new square-shaped core protection case 3 that covers the amorphous core 2, including the lap portion 21.
[0040] Furthermore, the core protection case is provided with suspension holes (suspension holes 32) at both ends of the first surface of the third portion in the connecting direction for lifting the third portion side of the core protection case. With this configuration, for example, the third portion 3c side of the core protection case 3 can be lifted, and it becomes easy to invert the case into its front and back sides in a vertical position with the suspension holes 32 facing upwards.
[0041] Furthermore, the above-mentioned suspension holes are positioned opposite to the suspension holes for the suspension jig used to lift the lap portion, which are provided at both ends of the outer side surface of the suspension jig in the direction of connection. With this configuration, for example, a wire can be passed through the suspension hole 72 of the attached suspension jig 7 for the lap portion and the suspension hole 32 of the core protection case 3, allowing the core protection case 3 to be lifted horizontally and in a balanced manner while lying on its side.
[0042] Furthermore, the above-mentioned suspension holes are used for both lifting the third portion side for attaching the suspension jig and lifting the iron core protection case in a horizontal position using the suspension jig suspension holes. With this configuration, for example, the number of holes in the iron core protection case 3 can be reduced, making it possible to lift the iron core protection case 3 while maintaining a certain level of strength.
[0043] Furthermore, the core protection case is provided with reinforcing stays (reinforcing stays 34) to reinforce the shape of the wound core at the corner (corner C) formed by the first surface of the first part and the first surface of the third part, and at the corner (corner C) formed by the first surface of the second part and the first surface of the third part. With this configuration, for example, the amorphous core 2 can be prevented from falling into the corner C of the core protection case 3 due to its own weight, and a wire can be easily passed through the suspension hole 32.
[0044] Furthermore, the reinforcing stay is shaped to conform to the bent portions (R portions) on the outer layer side of both ends of the base formed by the wound core, which is covered by the iron core protective case that has been lifted up, on the side of the third portion. With this configuration, for example, creases are less likely to form at the bent portions (R portions), and damage to the amorphous iron core 2 can be prevented.
[0045] The present invention is not limited to the embodiments described above, and in the implementation stage, the components can be modified and implemented without departing from the gist of the invention, or the multiple components disclosed in the embodiments can be appropriately combined. [Explanation of symbols]
[0046] 1 molded coil 2 Amorphous iron core 21 Amorphous iron core wrap section 22 Insulating Wrapping Boundary 3. Iron core protective case 31. Round holes for passing bolts to attach the dedicated lifting jig. 32 Hanging holes 33 Extension 34 Reinforcement stay 4. Wrap section cover 5. Splint 6. Insulating board 7. Lifting jig specifically for the wrap section 71 Bolt holes for dedicated lifting fixture 72. Hanging holes for dedicated hanging fixtures 8. A jig for keeping the overlapping section upright when inserting the coil.
Claims
1. A core protection case that is placed over a wound iron core, The aforementioned core protection case is It is composed of a first portion having a tip that covers one end of the lapped portion of the wound core to be lap-joined, a second portion having a tip that covers the other end of the lapped portion, and a third portion connecting the first portion and the second portion. The first portion and the tip of the second portion opposite to the third portion are, It is formed by a first surface which is the outer side surface of the iron core protective case, and a second surface which extends from the first surface at a predetermined angle, The second surface is provided with a hole for attaching a suspension jig that is connected to the lap portion. A core protection case characterized by the following features.
2. The aforementioned holes are provided on the side of the first surface rather than the center of the second surface of each tip portion. The core protection case according to feature 1.
3. The aforementioned core protection case is The lifting jig is attached by bolts inserted into bolt holes that are aligned with bolt holes provided at both ends of the lifting jig in the connecting direction. The core protection case according to feature 1.
4. The aforementioned core protection case is At both ends of the first surface of the third portion in the connecting direction, there are suspension holes for lifting the third portion side of the iron core protective case. The core protection case according to feature 1.
5. The aforementioned hanging hole is, It is provided at a position opposite to the lifting holes of the lifting jig for lifting the lap portion, which are provided at both ends in the connecting direction on the outer side surface of the lifting jig. The core protection case according to feature 4.
6. The aforementioned hanging hole is, This hole is used for both lifting the third portion for attaching the lifting jig and lifting the iron core protective case in a horizontal position using the lifting jig's lifting hole. The core protection case according to feature 5.
7. The aforementioned core protection case is Reinforcing stays are provided at the corners formed by the first surface of the first portion and the first surface of the third portion, and at the corners formed by the first surface of the second portion and the first surface of the third portion, in order to reinforce the shape of the wound iron core. The core protection case according to feature 1.
8. The aforementioned reinforcing stay is The third portion is shaped to follow the bent portion, which is the outer layer portion at both ends of the bottom of the wound core that is covered by the iron core protective case that has been lifted. The core protection case according to feature 7.
9. An amorphous core molded transformer having a coil wound around a wound core covered with the core protective case described in claim 1.
10. A method for manufacturing an amorphous iron core molded transformer according to claim 9, By passing a wire through the suspension holes provided at both ends in the connecting direction of the first surface of the third portion and lifting and lowering it, the core protection case covering the wound core is placed on its side. The lifting jig is attached to the iron core protective case by bolts inserted into bolt holes that are aligned with the bolt holes provided at both ends of the lifting jig in the connecting direction. The wire is attached to the suspension holes of the suspension jig provided at both ends in the connecting direction on the outer side surface of the attached suspension jig, and the object is lifted in a vertical position with the overlapping portion facing upwards. From above, which is the tip side of the wrap portion from which the aforementioned suspension jig has been removed, the coil to be wound around the winding iron core is inserted. The wrap portion is closed with the wrap portion cover. A method for manufacturing an amorphous iron core molded transformer, characterized by the following features.