Die strip structure for filling heat dissipation cavity of high-voltage coil of dry-type transformer

Abstract

The utility model relates to the technical field of dry-type transformers, in particular to a mold strip structure for filling a heat dissipation cavity of a high-voltage coil of a dry-type transformer, which comprises a mold strip body and a joint piece, the mold strip body is strip-shaped, and comprises two arc parts, a connecting part and two deformation parts in the section direction of the mold strip body, the two ends of the connecting part are fixedly connected with the middle sections of the two arc parts respectively, the two arc parts face the same direction, the connecting part is located between the two deformation parts, the two ends of the two deformation parts are fixedly connected with the ends of the two arc parts, the joint part is in threaded connection with the connecting part, and the two ends of the joint part are rotationally connected with the two deformation parts respectively. According to the utility model, the deformation parts can be in a straight shape or a bent arc shape by screwing the combined piece, so that dual purposes of an arc shape and a straight strip shape are realized, the length of the mold strip can be longer, and the mold strip is suitable for a large-batch filling situation.

Description

Technical Field

[0001] This application relates to the field of dry-type transformer technology, and more specifically to a template structure for filling the heat dissipation cavity of a dry-type transformer high-voltage coil. Background Technology

[0002] A dry-type transformer is a type of transformer whose core and windings are not immersed in insulating oil. A dry-type transformer includes a high-voltage coil. It should be noted that after the high-voltage coil is wound, epoxy resin is cast onto the outside of the coil to provide protection. Simultaneously, to improve the heat dissipation of the high-voltage coil, a mold strip is often placed inside the casting mold before casting. After casting, the mold strip is removed, resulting in the desired shape. Figure 1 The high-voltage coil 92 shown has multiple heat dissipation cavities 921.

[0003] There is a filling die strip 90, such as Figure 2 As shown, the cross-section of the mold strip is a solid waist shape. Before casting, multiple of these strips are placed in the casting mold. However, because the cross-section of the mold strip is waist-shaped, when two filling mold strips 90 are placed side by side, a gap 901 exists at the junction of the arcs of the two filling mold strips 90, and epoxy resin will flow into the gap 901. Therefore, another type of filling mold strip 91 is now available, such as... Figure 3 As shown, one end of the mold strip is semi-circular, and the other end is a semi-circular groove. When two filling mold strips 91 are placed side by side, the arc joints of the two filling mold strips 91 are tightly joined. However, because the high-voltage coil is waist-shaped, that is, the high-voltage coil has an arc-shaped portion, although... Figure 3 The mold strips can be tilted at a predetermined angle to approximate an arc by "substituting a curve with a straight line". However, this also requires the overall length of the mold strip to be relatively short so that the contour obtained by "substituting a curve with a straight line" is closer to an arc. The overall size of the high-voltage coil is relatively large, which leads to the need to place a large number of mold strips.

[0004] Therefore, there is a need for a mold strip structure that can be used in both arc and straight shapes, with a longer strip length, and is suitable for filling the heat dissipation cavity of the high-voltage coil of a dry-type transformer in a high-volume filling scenario. Utility Model Content

[0005] The application aims to provide a mold strip structure for filling the heat dissipation cavity of a high-voltage coil of a dry-type transformer. The mold strip structure comprises a mold strip body and a joint. The mold strip body is in the shape of a long strip. In the cross-sectional direction of the mold strip body, the mold strip body comprises two circular arc portions, a connecting portion and two deformation portions. The two ends of the connecting portion are fixedly connected with the middle sections of the two circular arc portions respectively. The two circular arc portions are oriented in the same direction. The connecting portion is located between the two deformation portions. The two ends of the two deformation portions are fixedly connected with the end portions of the two circular arc portions respectively. The joint is threadedly connected with the connecting portion. The two ends of the joint are rotatably connected with the two deformation portions respectively. When the joint is rotated circumferentially, the two deformation portions are bent by a predetermined angle towards the same side. By screwing the joint, the deformation portions can be straight or arc-shaped. Compared with the prior art, the mold strip structure has the advantages of dual use of circular arc type and straight strip type, longer length and suitability for large-volume filling.

[0006] Another object of the application is to provide a mold strip structure for filling the heat dissipation cavity of a high-voltage coil of a dry-type transformer. The width of the deformation portion is smaller than the widths of the connecting portion and the circular arc portion, so that the deformation portion can be deformed under stress.

[0007] To achieve the above-mentioned at least one object, the application provides a mold strip structure for filling the heat dissipation cavity of a high-voltage coil of a dry-type transformer. The mold strip structure comprises:

[0008] a mold strip body. The mold strip body is in the shape of a long strip. In the cross-sectional direction of the mold strip body, the mold strip body comprises two circular arc portions, a connecting portion and two deformation portions. The two ends of the connecting portion are fixedly connected with the middle sections of the two circular arc portions respectively. The two circular arc portions are oriented in the same direction. The connecting portion is located between the two deformation portions. The two ends of the two deformation portions are fixedly connected with the end portions of the two circular arc portions respectively; and

[0009] a joint. The joint is threadedly connected with the connecting portion. The two ends of the joint are rotatably connected with the two deformation portions respectively. When the joint is rotated circumferentially, the two deformation portions are bent by a predetermined angle towards the same side.

[0010] In one or more embodiments of the application, the width of the deformation portion is smaller than the widths of the connecting portion and the circular arc portion.

[0011] In one or more embodiments of the application, the two ends of the joint each have a ball portion. The deformation portion has a ball groove. The ball portion is rotatably arranged in the ball groove.

[0012] In one or more embodiments of the application, the two ends of the joint each have a screwing portion.

[0013] In one or more embodiments of the present application, the deformation part is partially thickened.

[0014] In the embodiment of the present application, the mold strip structure for filling the heat dissipation cavity of the high-voltage coil of the dry-type transformer comprises a mold strip body and a joint piece. The mold strip body is in the shape of a long strip. In the cross-sectional direction of the mold strip body, the mold strip body comprises two circular arc parts, a connecting part, and two deformation parts. The two ends of the connecting part are fixedly connected with the middle sections of the two circular arc parts, respectively. The two circular arc parts are oriented in the same direction. The connecting part is located between the two deformation parts. The two ends of the two deformation parts are fixedly connected with the end sections of the two circular arc parts, respectively. The joint piece is threadedly connected with the connecting part. The two ends of the joint piece are rotatably connected with the two deformation parts, respectively. When the joint piece is rotated circumferentially, the two deformation parts are bent by a predetermined angle towards the same side. By screwing the joint piece, the deformation parts can be in a straight shape or an arc shape. Compared with the prior art, the mold strip structure has the advantages of dual use of the arc type and the straight strip type, longer length of the mold strip, and suitability for large-batch filling situations. BRIEF DESCRIPTION OF DRAWINGS

[0015] These and / or other aspects and advantages of the present application will become more apparent and more readily appreciated from the following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings in which:

[0016] Figure 1 FIG. 1 illustrates a structural schematic diagram of a high-voltage coil of a dry-type transformer according to the prior art;

[0017] Figure 2 FIG. 4 illustrates a structural schematic diagram of a mold strip for filling according to the prior art when the mold strips are arranged in parallel with each other;

[0018] Figure 3 FIG. 5 illustrates a structural schematic diagram of another mold strip for filling according to the prior art when the mold strips are arranged in parallel with each other;

[0019] Figure 4 FIG. 6 illustrates a structural schematic diagram of a mold strip structure for filling the heat dissipation cavity of the high-voltage coil of a dry-type transformer according to the present application. DETAILED DESCRIPTION

[0020] The terms and words used in the following description and claims are not limited to the meanings that are commonly understood, but are used by the inventors to enable a clear and consistent understanding of the present application. Accordingly, it is apparent that the following description of various embodiments of the present application is provided only for the purpose of illustration and explanation, and not for the purpose of limiting the present application as defined in the appended claims and their equivalents.

[0021] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0022] Although numerals such as "first", "second", and the like will be used to describe various components, those components are not limited by those numerals. The terms are used only to distinguish one component from another. For example, a first component could be termed a second component, and, likewise, a second component could be termed a first component, without departing from the teachings of the present inventive concept. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0023] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "has", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

[0024] The structure of the strip for filling the high-voltage coil heat dissipation cavity of the dry-type transformer, refer to Figure 4 According to a preferred embodiment of the present application, the structure of the strip for filling the high-voltage coil heat dissipation cavity of the dry-type transformer comprises a strip body 10 and a joint 20.

[0025] Specifically, the strip body 10 is in the shape of a long strip. In the cross-sectional direction of the strip body 10, the strip body 10 comprises two arc sections 101, a connecting section 102, and two deformation sections 103. The two ends of the connecting section 102 are fixedly connected to the middle sections of the two arc sections 101, respectively. The two arc sections 101 face the same direction. The connecting section 102 is located between the two deformation sections 103. The two ends of the two deformation sections 103 are fixedly connected to the end sections of the two arc sections 101. The fixed connection modes include, but are not limited to, injection molding.

[0026] In addition, the joint 20 is threadedly connected to the connecting section 102. The two ends of the joint 20 are rotatably connected to the two deformation sections 103, respectively.

[0027] It should be noted that the material of the die strip body 10 is plastic, and in the initial state, the two deformation portions 103 are in a straight line shape, at this time, the length from the two ends of the joint member 20 to the connecting portion 102 is equal, which is suitable for being placed in the straight line segment of the high-voltage coil filling mold; when the joint member 20 is rotated in the circumferential direction, the two deformation portions 103 are bent by a predetermined angle towards the same side, at this time, the length from one end of the joint member 20 to the connecting portion 102 is greater than the length from the other end of the joint member 20 to the connecting portion 102, and the two deformation portions 103 are both in an arc shape towards the same side, which is suitable for being placed in the arc segment of the high-voltage coil filling mold. It can be seen that by rotating the joint member 20, the filling personnel can freely adjust the cross section of the die strip body 10 to be a straight strip or an arc strip, and the radius of the arc strip can be adjusted within a certain range to adapt to the radius of different positions of the arc segment of the high-voltage coil filling mold. In addition, since the radius of the deformation portion 103 can be adjusted, it itself constitutes an arc shape without the need to approximate the arc shape by using multiple small straight die strip bodies 10 in a "straight instead of curved" manner. Therefore, the overall length of the deformation portion 103 can be made longer, so that the number of die strip bodies 10 placed in the high-voltage coil filling mold is smaller, which is suitable for large-batch filling situations.

[0028] Further, in order to facilitate the deformation of the deformation portion 103 after being subjected to stress, the width of the deformation portion 103 is smaller than the width of the connecting portion 102 and the arc portion 101.

[0029] Further, in order to realize the rotating connection of the joint member 20 and the deformation portion 103, both ends of the joint member 20 are provided with a ball portion 201, the deformation portion 103 is provided with a ball groove 1031, and the ball portion 201 is rotatably arranged in the ball groove 1031. It should be noted that the ball portion 201 is arranged in the ball groove 1031 by means of one-piece injection molding.

[0030] Further, in order to provide space for opening the ball groove 1031 and avoid the deformation portion 103 being too thin after the ball groove 1031 is opened, the part of the deformation portion 103 where the ball groove 1031 is arranged is partially thickened.

[0031] Further, in order to facilitate the rotation of the joint member 20 by the filling personnel, both ends of the joint member 20 are provided with a rotating portion 202, and in the embodiment of the present application, the cross section of the rotating portion 202 is a regular hexagon.

[0032] In summary, the die strip structure for filling the high-voltage coil heat dissipation cavity of the dry-type transformer according to the embodiment of the present application is illustrated, which provides both arc and straight types for the die strip structure for filling the high-voltage coil heat dissipation cavity of the dry-type transformer, the length of the die strip can be longer, which is suitable for large-batch filling situations, and other advantages.

[0033] It is worth mentioning that, in the embodiment of the present application, the structure of the mold strip for filling the high-voltage coil heat dissipation cavity of the dry-type transformer is simple, does not involve complex manufacturing processes and expensive materials, and has high economy. At the same time, for the manufacturer, the mold strip for filling the high-voltage coil heat dissipation cavity of the dry-type transformer provided by the present application is easy to produce and has low cost, which is more conducive to controlling the production cost and further conducive to product promotion and use.

[0034] Those skilled in the art will understand that the embodiments of the present application shown in the above description and the accompanying drawings are only examples and do not limit the present application. The purpose of the present application has been completely and effectively achieved. The function and structural principle of the present application have been demonstrated and explained in the embodiments, and the implementation of the present application can be any deformation or modification without departing from the principle.

Claims

1. A template structure for filling the heat dissipation cavity of a dry-type transformer high-voltage coil, characterized in that: The dry-type transformer high-voltage coil heat dissipation cavity filling die structure comprises a die body, the die body is in the shape of a long strip, in the cross-sectional direction of the die body, the die body comprises two circular arc portions, a connecting portion and two deformation portions, the two ends of the connecting portion are respectively fixedly connected with the middle sections of the two circular arc portions, the two circular arc portions face the same direction, the connecting portion is located between the two deformation portions, and the two ends of the two deformation portions are fixedly connected with the end portions of the two circular arc portions; and a joint, the joint is threadedly connected with the connecting portion, and the two ends of the joint are respectively rotationally connected with the two deformation portions, when the joint is circumferentially rotated, the two deformation portions are bent by a predetermined angle towards the same side.

2. The structure of the mold strip for filling the dry-type transformer high-voltage coil heat dissipation cavity according to claim 1, characterized in that: The width of the deformation portion is smaller than the widths of the connecting portion and the circular arc portions.

3. The structure of the mold strip for filling the dry-type transformer high-voltage coil heat dissipation cavity according to claim 2, characterized in that: The two ends of the joint each have a ball portion, the deformation portion has a ball groove, and the ball portion is rotatably arranged in the ball groove.

4. The structure of the mold strip for filling the dry-type transformer high-voltage coil heat dissipation cavity according to claim 3, characterized in that: The two ends of the joint each have a screwing portion.

5. The structure of the mold strip for filling the dry transformer high voltage coil heat dissipation cavity according to claim 3, characterized in that: The part of the deformation portion provided with the ball groove is partially thickened.

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