Dry-type transformer winding pouring mold and dry-type transformer winding

Abstract

The invention discloses a dry-type transformer winding pouring mold. The dry-type transformer winding pouring mold comprises a mold body and a terminal forming assembly. A cylindrical main body pouring cavity is formed in the mold main body, and a pouring opening communicated to the main body pouring cavity is formed in the mold main body; and the terminal forming assembly is arranged on the outer side of the mold main body, the terminal forming assembly is provided with a terminal pouring cavity, the terminal pouring cavity is communicated with the main body pouring cavity, and the cavity wall of the terminal pouring cavity is concavely provided with an umbrella skirt forming groove. The cavity wall of the terminal pouring cavity is concavely provided with the umbrella skirt forming groove, so that the pouring terminal is provided with an umbrella skirt structure, the distance of different wiring terminals along the surface of the insulating sleeve is increased, the creepage distance between the different wiring terminals can be increased, and the operation reliability of the winding is improved. The invention further discloses the dry-type transformer winding manufactured by adopting the dry-type transformer winding pouring mold.

Description

Technical Field

[0001] The invention relates to a dry-type transformer, in particular to a dry transformer winding casting mould and a dry transformer winding. Background Art

[0002] The dry-type transformer has a winding that is approximately cylindrical, and the winding includes a wound coil and an insulating sleeve. The outer side of the wound coil has a terminal. The coil portion of the insulating sleeve wraps the wound coil to form the winding body, and the terminal portion of the insulating sleeve wraps the terminal to form a casting terminal. The outermost end of the terminal is exposed to facilitate the connection of wires. When the winding is produced, the wound coil is placed in a casting mold, and then the insulating material is poured, and the winding is demolded after cooling. In the current dry-type transformer, the creepage distance between the terminals is insufficient in harsh environments or when high voltage levels are required. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a dry transformer winding casting mold, which can increase the creepage distance between different terminal blocks of the cast dry transformer winding.

[0004] The present invention also provides a dry transformer winding manufactured by the above-mentioned dry transformer winding casting mold.

[0005] According to the first embodiment of the present invention, the dry-type transformer winding casting mold comprises a mold body and a terminal forming assembly. The mold body is provided with a cylindrical main body casting cavity, and the mold body is provided with a casting port connected to the main body casting cavity; the terminal forming assembly is arranged on the outside of the mold body, and the terminal forming assembly is provided with a terminal casting cavity, and the terminal casting cavity is connected with the main body casting cavity, and the cavity wall of the terminal casting cavity is concavely provided with an umbrella skirt forming groove.

[0006] The dry-type transformer winding casting mold according to the embodiment of the first aspect of the present invention has at least the following beneficial effects: after the wound coil is placed in the casting mold, the insulating material is poured through the casting port, and the winding is formed after cooling. The insulating material wraps the wound coil through the main casting cavity and is cooled to form the winding body. The insulating material wraps the terminal through the terminal casting cavity and is cooled to form the casting terminal. Since the cavity wall of the terminal casting cavity is concavely provided with an umbrella skirt forming groove, the casting terminal has an umbrella skirt structure, which increases the distance between different terminals along the surface of the insulating sleeve, thereby increasing the creepage distance between different terminals and improving the operating reliability of the winding.

[0007] According to some embodiments of the present invention, the width of the shed forming groove has a tendency to decrease from the groove opening to the groove bottom.

[0008] According to some embodiments of the present invention, the umbrella skirt forming groove includes a groove bottom wall and two groove side walls, the two groove side walls are arranged at an acute angle, the bottoms of the two groove side walls are connected by the groove bottom wall, the groove bottom wall is arc-shaped, and there is a smooth transition between the groove side walls and the groove bottom wall.

[0009] According to some embodiments of the present invention, the terminal casting cavity is cylindrical, the shed forming groove is located on the circumferential cavity wall of the terminal casting cavity, and the shed forming groove is an annular groove arranged around the central axis of the terminal casting cavity.

[0010] According to some embodiments of the present invention, at least two shed forming grooves are provided, and all of the shed forming grooves are arranged at intervals along the central axis of the terminal casting cavity.

[0011] According to some embodiments of the present invention, the terminal forming assembly includes two terminal side molds and a terminal cover mold, the two terminal side molds are arranged around the central axis of the terminal casting cavity, the terminal cover mold is arranged at one end of the two terminal side molds away from the main casting cavity, the terminal cover mold and the two terminal side molds enclose the terminal casting cavity, the two terminal side molds are detachably connected, the terminal side mold and the terminal cover mold are detachably connected, the end of the terminal side mold close to the mold body is detachably connected to the mold body, and the umbrella skirt forming groove is located in the terminal side mold.

[0012] According to some embodiments of the present invention, the terminal side mold is provided with a handle mounting hole.

[0013] According to some embodiments of the present invention, one of the terminal side mold and the terminal cover mold is provided with a limiting block, and the other is provided with a limiting groove, and the limiting block is accommodated in the limiting groove.

[0014] According to some embodiments of the present invention, the mold body includes an inner mold core, an outer mold plate, a lower end plate, an upper end plate and a terminal panel, the terminal panel is arranged on the outer mold plate, the outer mold plate is arranged around the inner mold core, the upper end plate is arranged at the upper end of the inner mold core and the upper end of the outer mold plate, the lower end plate is arranged at the lower end of the inner mold core and the lower end of the outer mold plate, the inner mold core, the outer mold plate, the lower end plate, the upper end plate and the terminal panel enclose the main casting cavity, the terminal forming assembly is arranged on the terminal panel; the terminal panel is provided with an overflow hole, and the terminal casting cavity is connected with the main casting cavity through the overflow hole.

[0015] The dry transformer winding according to the embodiment of the second aspect of the present invention is manufactured by using the above-mentioned dry transformer winding casting mold.

[0016] The dry transformer winding according to the embodiment of the second aspect of the present invention has at least the following beneficial effects: due to the use of the above-mentioned casting mold, the casting terminal of the dry transformer winding has an umbrella skirt structure, which increases the creepage distance between different terminal blocks and improves the operational reliability.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a three-dimensional schematic diagram of a casting mold for a dry-type transformer winding according to an embodiment of the present invention;

[0020] Figure 2 For the embodiment of the present invention Figure 1 A schematic cross-sectional view in the AA direction;

[0021] Figure 3 For the embodiment of the present invention Figure 2 A local enlarged schematic diagram of point B;

[0022] Figure 4 It is an exploded schematic diagram of a terminal forming assembly and a terminal panel according to an embodiment of the present invention;

[0023] Figure 5 An exploded schematic diagram of a terminal forming assembly according to an embodiment of the present invention;

[0024] Figure 6 It is a three-dimensional schematic diagram of the winding according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] Mold body 100, main body casting cavity 101, casting gate 102, inner mold core 110, outer mold plate 120, lower end plate 130, upper end plate 140, terminal panel 150, flow hole 151;

[0027] Terminal forming assembly 200, terminal casting cavity 201, umbrella skirt forming groove 202, terminal side mold 210, handle mounting hole 211, limiting block 212, terminal cover mold 220, limiting groove 221, adapting hole 222;

[0028] Dry transformer winding 300 , winding body 310 , casting terminal 320 , connection terminal 321 , shed structure 322 . DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientation, such as orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the description of the present invention, "a plurality" means more than two. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0033] There is a solution for increasing the creepage distance between the terminals of the winding 300, which is to make the cast terminal 320 longer, that is, to increase the distance between the outer end of the terminal and the wound coil. However, after the winding 300 is made into a dry-type transformer, a metal shell needs to be set on the outside of the winding 300, and a sufficient air discharge distance is also required between the outer end of the terminal and the metal shell, so that the size of the metal shell needs to be made larger, which increases the manufacturing cost and increases the floor space of the dry-type transformer.

[0034] Reference Figures 1 to 5 , is a dry transformer winding casting mold according to an embodiment of the present invention, comprising a mold body 100 and a terminal forming assembly 200. The mold body 100 is provided with a cylindrical main body casting cavity 101, and a casting port 102 connected to the main body casting cavity 101 is provided at the upper end of the mold body 100; the terminal forming assembly 200 is arranged on the outer side of the mold body 100, and the terminal forming assembly 200 is provided with a terminal casting cavity 201, and the terminal casting cavity 201 is connected with the main body casting cavity 101, and the cavity wall of the terminal casting cavity 201 is concavely provided with an umbrella skirt forming groove 202.

[0035] After the wound coil is placed in the casting mold, the insulating material is poured through the pouring port 102, and the winding 300 is formed after cooling. The insulating material wraps the wound coil through the main casting cavity 101 and cools to form the winding body 310. The insulating material wraps the terminal 321 through the terminal casting cavity 201 and cools to form the casting terminal 320; because the cavity wall of the terminal casting cavity 201 is concave with an umbrella skirt forming groove 202, the casting terminal 320 has an umbrella skirt structure 322, so that the distance between different terminals 321 along the surface of the insulating sleeve is increased, thereby increasing the creepage distance between different terminals 321 and improving the operating reliability of the winding 300. Furthermore, the casting terminal 320 does not need to be made longer, so that the mechanical strength of the casting terminal 320 is higher.

[0036] In the embodiment, the width of the shed forming groove 202 tends to decrease along the direction from the groove mouth to the groove bottom. Under the condition that the creepage distance is basically not affected, it is convenient for the insulating material to enter the shed forming groove 202 to form the shed structure 322, and it is convenient to demold the shed structure 322 after casting, and the comprehensive use effect is good.

[0037] In the embodiment, the shed forming groove 202 includes a groove bottom wall and two groove side walls, the two groove side walls are arranged at an acute angle, the bottoms of the two groove side walls are connected by the groove bottom wall, the groove bottom wall is arc-shaped, and the groove side walls and the groove bottom wall have a smooth transition. The above-mentioned shed forming groove 202 structure is convenient for machining and forming, and has good processability and use effect.

[0038] Specifically, the cross section of the shed forming groove 202 is similar to a V-shaped groove and the groove bottom is in an arc shape. It is conceivable that in other embodiments, the cross section of the shed forming groove 202 can also be other shapes, for example, the cross section of the shed forming groove 202 is a trapezoid, a rectangle, etc., and those skilled in the art can make specific configurations according to actual needs.

[0039] In the embodiment, the central axis of the main casting cavity 101 is arranged in the up-down direction, the central axis of the terminal casting cavity 201 is arranged in the horizontal direction, the terminal casting cavity 201 is cylindrical, the shed forming groove 202 is located on the circumferential cavity wall of the terminal casting cavity 201, and the shed forming groove 202 is an annular groove arranged around the central axis of the terminal casting cavity 201. The terminal casting cavity 201 is cylindrical and the shed forming groove 202 extends in an annular manner around the central axis, so that the shed structure 322 of the casting terminal 320 is relatively uniform in all directions, which is conducive to improving the creepage distance between the connection terminals 321 in all directions.

[0040] It is conceivable that, in some embodiments, the shape of the cast terminal 320 may also be conical, and in this case, an umbrella skirt structure 322 may also be provided to increase the creepage distance between the wiring terminals 321 .

[0041] In the embodiment, at least two shed forming grooves 202 are provided, and all shed forming grooves 202 are arranged at intervals along the central axis of the terminal casting cavity 201. A plurality of shed forming grooves 202 are provided, so that a plurality of shed structures 322 are provided at the casting terminal 320, thereby further increasing the distance between different wiring terminals 321 along the outer surface of the insulating sleeve, that is, further increasing the creepage distance between different wiring terminals 321.

[0042] Specifically, the winding 300 of this embodiment has thirteen shed structures 322 at the casting terminal 320. It is conceivable that in other embodiments, the number of shed structures 322 at the casting terminal 320 can also be one, two, three, four or more, and those skilled in the art can make specific configurations according to actual needs.

[0043] In the embodiment, the depths of all the shed forming grooves 202 are the same, which facilitates processing of the shed forming grooves 202 at the terminal forming assembly 200 , and the structure is relatively simple and easy to implement.

[0044] Specifically, the depth direction of the shed molding groove 202 is perpendicular to the central axis of the terminal casting cavity 201 , which facilitates demolding of the shed structure 322 .

[0045] In an embodiment, the terminal forming assembly 200 includes two terminal side molds 210 and a terminal cover mold 220. The two terminal side molds 210 are arranged around the central axis of the terminal casting cavity 201. The terminal cover mold 220 is arranged at one end of the two terminal side molds 210 away from the main casting cavity 101. The terminal cover mold 220 and the two terminal side molds 210 enclose the terminal casting cavity 201. The two terminal side molds 210 are detachably connected, the terminal side mold 210 and the terminal cover mold 220 are detachably connected, and the end of the terminal side mold 210 close to the mold body 100 is detachably connected to the mold body 100, and the umbrella skirt forming groove 202 is located in the terminal side mold 210.

[0046] After the winding 300 is cast, it is necessary to remove the mold. Since the shed molding groove 202 is located on the circumferential cavity wall of the terminal casting cavity 201, that is, the shed molding groove 202 is located on the terminal side mold 210. When removing the mold, first remove the terminal cover plate, then separate the two terminal side molds 210, so that the shed structure 322 is out of the shed molding groove 202. The demolding method is relatively simple and avoids damaging the casting terminal 320.

[0047] Specifically, the terminal cover mold 220 is provided with a through hole, and the terminal side mold 210 is provided with a threaded hole at one end away from the casting cavity. The terminal cover mold 220 and the terminal side mold 210 are detachably connected by screws passing through the through hole and threadedly connected to the threaded hole. The ends of the two terminal side molds 210 close to the casting cavity are also detachably connected to the mold body 100 by screw locking. The two ends of the terminal side mold 210 are respectively connected through the terminal cover plate and the mold body 100, so that the two terminal side molds 210 are detachably connected.

[0048] It is conceivable that, in other embodiments, the terminal cover mold 220 and the terminal side mold 210 can also be detachably connected by other structures, for example, by means of a lock; the two terminal side molds 210 can also be detachably connected by means of a lock; the terminal side mold 210 and the mold body 100 can also be detachably connected by means of a lock.

[0049] In the embodiment, the terminal side mold 210 is provided with a handle installation hole 211. Since the temperature of the terminal side mold 210 is high when it is demolded after pouring, the handle installation hole 211 is provided at the terminal side mold 210, and a clamping handle can be installed. The clamping handle is clamped with a tool to disassemble the terminal side mold 210, which is safer.

[0050] Specifically, the handle mounting hole 211 is a threaded hole, and the clamping handle can be screwed. It is conceivable that in other embodiments, the handle mounting hole 211 can also be a plain hole, and the clamping handle is plugged into the handle mounting hole 211 and fixed by welding or the like.

[0051] In the embodiment, the terminal side mold 210 is provided with a limiting block 212, and the terminal cover mold 220 is provided with a limiting groove 221, and the limiting block 212 is accommodated in the limiting groove 221. By accommodating the limiting block 212 in the limiting groove 221, the position of the terminal side mold 210 can be fixed by the terminal cover mold 220, so that the two terminal side molds 210 are not easily separated under the pouring pressure, which is conducive to the molding of the pouring terminal 320.

[0052] Specifically, the limit block 212 is semicircular, the limit blocks 212 of the two terminal side molds 210 are butted together to form an annular block, and the limit groove 221 is a circular groove. It is conceivable that in other embodiments, the limit block 212 can be provided on the terminal cover mold 220, and the limit groove 221 can be provided on the terminal side mold 210; the limit block 212 and the limit groove 221 can be of other shapes.

[0053] Specifically, the terminal cover mold 220 is provided with an adapting hole 222 for accommodating the outer end of the terminal 321. When the wound coil is placed in the casting mold, the outer end of the terminal 321 needs to be inserted into the adapting hole 222 to prevent the insulating material from completely covering the outer end of the terminal 321 when casting the insulating material.

[0054] In the embodiment, the mold body 100 includes an inner mold core 110, an outer mold plate 120, a lower end plate 130, an upper end plate 140 and a terminal panel 150, the terminal panel 150 is arranged on the outer mold plate 120, the outer mold plate 120 is arranged around the inner mold core 110, the upper end plate 140 is arranged at the upper end of the inner mold core 110 and the upper end of the outer mold plate 120, the lower end plate 130 is arranged at the lower end of the inner mold core 110 and the lower end of the outer mold plate 120, the inner mold core 110, the outer mold plate 120, the lower end plate 130, the upper end plate 140 and the terminal panel 150 enclose a main casting cavity 101, and the terminal forming assembly 200 is arranged on the terminal panel 150; the terminal panel 150 is provided with a flow hole 151, and the terminal casting cavity 201 is connected with the main casting cavity 101 through the flow hole 151. The above-mentioned mold body 100 can form a main casting cavity 101 that is approximately cylindrical, and has a simple structure and is easy to implement. The insulating material first enters the main casting cavity 101 from the casting gate 102 , and then enters the terminal casting cavity 201 through the flow hole 151 .

[0055] Specifically, a sealing ring is provided around the opening of the flow hole 151 of the terminal panel 150, and the sealing ring is clamped between the terminal side mold 210 and the terminal panel 150, so that the terminal side mold 210 and the terminal panel 150 can be detachably connected and have a better sealing effect during assembly.

[0056] In the embodiment, the terminal panel 150 is also detachably connected to the outer template 120, and the terminal panel 150 also has a tap casting groove for casting to form the tap terminal. The terminal panel 150 can be detachably connected to the outer template 120 by screw locking, clip clamping, etc.

[0057] Specifically, the pouring port is opened on the upper end plate 140 .

[0058] Reference Figure 6 The present invention also discloses a dry transformer winding 300, which is manufactured using the above-mentioned casting mold. Due to the use of the above-mentioned casting mold, the casting terminal 320 of the dry transformer winding 300 has an umbrella skirt structure, which increases the creepage distance between different terminal blocks and improves the operation reliability.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A dry transformer winding casting mold, characterized in that: include: The mold body (100) is provided with a cylindrical main body casting cavity (101), and the mold body (100) is provided with a casting port (102) connected to the main body casting cavity (101); A terminal molding component (200) is arranged outside the mold body (100), and the terminal molding component (200) is provided with a terminal casting cavity (201), the terminal casting cavity (201) is connected with the main body casting cavity (101), and the cavity wall of the terminal casting cavity (201) is concavely provided with an umbrella skirt molding groove (202).

2. The dry transformer winding casting mold according to claim 1, characterized in that: The width of the umbrella skirt forming groove (202) has a tendency to decrease along the direction from the groove opening to the groove bottom.

3. The dry transformer winding casting mold according to claim 2, characterized in that: The umbrella skirt forming groove (202) comprises a groove bottom wall and two groove side walls, the two groove side walls are arranged at an acute angle, the bottoms of the two groove side walls are connected by the groove bottom wall, the groove bottom wall is arc-shaped, and the groove side walls and the groove bottom wall have a smooth transition.

4. The dry transformer winding casting mold according to claim 1, characterized in that: The terminal casting cavity (201) is columnar, the shed molding groove (202) is located on the circumferential cavity wall of the terminal casting cavity (201), and the shed molding groove (202) is an annular groove arranged around the central axis of the terminal casting cavity (201).

5. The dry transformer winding casting mold according to claim 4, characterized in that: At least two shed molding grooves (202) are provided, and all of the shed molding grooves (202) are arranged at intervals along the central axis of the terminal casting cavity (201).

6. The dry transformer winding casting mold according to claim 4, characterized in that: The terminal molding assembly (200) comprises two terminal side molds (210) and a terminal cover mold (220); the two terminal side molds (210) are arranged around the central axis of the terminal casting cavity (201); the terminal cover mold (220) is arranged at one end of the two terminal side molds (210) away from the main casting cavity (101); the terminal cover mold (220) and the two terminal side molds (210) enclose the terminal casting cavity (201); the two terminal side molds (210) are detachably connected to each other; the terminal side mold (210) and the terminal cover mold (220) are detachably connected; one end of the terminal side mold (210) close to the mold main body (100) is detachably connected to the mold main body (100); and the umbrella skirt molding groove (202) is located in the terminal side mold (210).

7. The dry transformer winding casting mold according to claim 6, characterized in that: The terminal side mold (210) is provided with a handle mounting hole (211).

8. The dry transformer winding casting mold according to claim 6, characterized in that: One of the terminal side mold (210) and the terminal cover mold (220) is provided with a limiting block (212), and the other is provided with a limiting groove (221), wherein the limiting block (212) is accommodated in the limiting groove (221).

9. The dry transformer winding casting mold according to claim 1, characterized in that: The mold body (100) comprises an inner mold core (110), an outer mold plate (120), a lower end plate (130), an upper end plate (140) and a terminal panel (150), wherein the terminal panel (150) is arranged on the outer mold plate (120), the outer mold plate (120) is arranged around the inner mold core (110), the upper end plate (140) is arranged at the upper end of the inner mold core (110) and the upper end of the outer mold plate (120), the lower end plate (130) is arranged at the lower end of the inner mold core (110) and the At the lower end of the outer mold plate (120), the inner mold core (110), the outer mold plate (120), the lower end plate (130), the upper end plate (140) and the terminal panel (150) enclose the main casting cavity (101), and the terminal forming assembly (200) is arranged on the terminal panel (150); the terminal panel (150) is provided with an overflow hole (151), and the terminal casting cavity (201) is connected with the main casting cavity (101) through the overflow hole (151).

10. A dry transformer winding, characterized in that: The dry transformer winding casting mold is used for manufacturing.

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