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

Abstract

The utility model discloses a casting mold for a dry transformer winding. The casting mold comprises a mold main 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 utility model further discloses the dry-type transformer winding manufactured by adopting the dry-type transformer winding pouring mold.

Description

TECHNICAL FIELD

[0001] The utility model relates to a dry-type transformer, in particular to a dry-type transformer winding pouring mold and dry-type transformer winding. BACKGROUND

[0002] The dry-type transformer has a winding approximating to a cylinder, the winding comprises a winding coil and an insulating sleeve, the winding coil has a terminal on the outside, the coil part of the insulating sleeve wraps the winding coil to form a winding main body, the terminal part of the insulating sleeve wraps the terminal to form a pouring terminal, and the outermost end of the terminal is exposed to facilitate the connection of an electric wire.When the winding is produced, the winding coil is placed in the pouring mold, then the insulating material is poured, and the winding is formed after cooling and demolding. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art. To this end, the utility model provides a dry-type transformer winding pouring mold, which can increase the creepage distance between different terminals of the poured dry-type transformer winding.

[0004] The utility model discloses still provide a kind of dry-type transformer winding made by above-mentioned dry-type transformer winding pouring mold.

[0005] According to the dry-type transformer winding pouring mold of the first aspect embodiment of the utility model, the following beneficial effects are at least obtained: after the winding coil is placed in the pouring mold, the insulating material is poured through the pouring port, and the winding is formed after cooling, the insulating material wraps the winding coil through the main body pouring cavity to form the winding main body, and the insulating material wraps the terminal through the terminal pouring cavity to form the pouring terminal; since the cavity wall of the terminal pouring cavity is concave with the umbrella skirt forming groove, the pouring terminal has the umbrella skirt structure, the distance between different terminals along the surface of the insulating sleeve is increased, so that the creepage distance between different terminals can be increased, and the operation reliability of the winding is improved.

[0006] According to some embodiments of the utility model, the width of the umbrella skirt forming groove has a decreasing trend along the direction from the slot opening to the slot bottom.

[0007]

[0008] According to some embodiments of the utility model, 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 through the groove bottom wall, the groove bottom wall is arc-shaped, and the groove side wall and the groove bottom wall are smoothly connected.

[0009] According to some embodiments of the utility model, the terminal pouring cavity is columnar, the umbrella skirt forming groove is located on the circumferential cavity wall of the terminal pouring cavity, and the umbrella skirt forming groove is an annular groove arranged around the central axis of the terminal pouring cavity.

[0010] According to some embodiments of the utility model, the umbrella skirt forming groove is provided in at least two, and all the umbrella skirt forming grooves are arranged at intervals along the central axis of the terminal pouring cavity.

[0011] According to some embodiments of the utility model, 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 pouring cavity, the terminal cover mold is arranged at one end of the two terminal side molds away from the main body pouring cavity, the terminal cover mold and the two terminal side molds form the terminal pouring cavity, the two terminal side molds are detachably connected, the terminal side mold and the terminal cover mold are detachably connected, one end of the terminal side mold close to the mold main body is detachably connected with the mold main body, and the umbrella skirt forming groove is located on the terminal side mold.

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

[0013] According to some embodiments of the utility model, 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 utility model, the mold main 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 on the upper end of the inner mold core and the upper end of the outer mold plate, the lower end plate is arranged on the lower end of the inner mold core and the lower end of the outer mold plate, and the inner mold core, the outer mold plate, the lower end plate, the upper end plate and the terminal panel form the main body pouring cavity, and the terminal forming assembly is arranged on the terminal panel.

[0015] The dry transformer winding is made by using the dry transformer winding pouring 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 operational reliability.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or 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 readily understood from the description of the embodiments in conjunction with the following drawings, in which:

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

[0020] Figure 2 For the embodiment of the utility model Figure 1 A cross-sectional schematic diagram in the AA direction;

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

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

[0024] Figure 6 This is a three-dimensional schematic diagram of the winding of an embodiment of the present utility model.

[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, adapter hole 222;

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

[0029] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0030] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0031] In the description of the present application, the plurality of refers to two or more. If there is a description of first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0032] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0033] A scheme for increasing the creepage distance between the wiring terminals of the winding 300 is known, which makes the pouring terminal 320 longer, i.e. increases the distance between the outer end of the wiring terminal and the wound coil. However, since the winding 300 is made into a dry-type transformer, the outer part of the winding 300 needs to be sleeved with a metal shell, and there also needs to be enough air discharge distance between the outer end of the wiring terminal and the metal shell, so that the size of the metal shell needs to be larger, increasing the manufacturing cost and the floor area of the dry-type transformer.

[0034] Referring to Figures 1 to 5 The dry-type transformer winding pouring mold of the present application comprises a mold main body 100 and a terminal forming assembly 200. The mold main body 100 is provided with a cylindrical main body pouring cavity 101, and the upper end of the mold main body 100 is provided with a pouring port 102 communicating with the main body pouring cavity 101; the terminal forming assembly 200 is arranged on the outer side of the mold main body 100, and the terminal forming assembly 200 is provided with a terminal pouring cavity 201, the terminal pouring cavity 201 is in communication with the main body pouring cavity 101, and the cavity wall of the terminal pouring cavity 201 is concavely provided with an umbrella skirt forming groove 202.

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

[0036] In an embodiment, the width of the umbrella skirt forming groove 202 has a narrowing trend from the groove opening to the groove bottom. In the case of basically not affecting the creepage distance, it is convenient for the insulating material to enter the umbrella skirt forming groove 202 to form the umbrella skirt structure 322, and it is convenient for the umbrella skirt structure 322 after pouring to be demolded, and the comprehensive use effect is better.

[0037] In an embodiment, the umbrella skirt 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 wall and the groove bottom wall are smoothly transitioned. The above-mentioned umbrella skirt forming groove 202 structure is convenient for being machined and formed in a machining manner, and has good processability and use effect.

[0038] Specifically, the cross section of the umbrella skirt forming groove 202 is similar to a V-shaped groove and the groove bottom is arc-shaped. It can be imagined that in other embodiments, the cross section of the umbrella skirt forming groove 202 can also be other shapes, for example, the cross section of the umbrella skirt forming groove 202 is trapezoidal, rectangular, etc., and a person skilled in the art can configure it according to actual needs.

[0039] In an embodiment, the central axis of the main body pouring cavity 101 is arranged in the up-down direction, the central axis of the terminal pouring cavity 201 is arranged in the horizontal direction, the terminal pouring cavity 201 is column-shaped, the umbrella skirt forming groove 202 is located on the circumferential cavity wall of the terminal pouring cavity 201, and the umbrella skirt forming groove 202 is an annular groove arranged around the central axis of the terminal pouring cavity 201. The terminal pouring cavity 201 is column-shaped and the umbrella skirt forming groove 202 extends annularly around the central axis, so that the umbrella skirt structure 322 of the pouring terminal 320 is relatively uniform in each direction, which is conducive to improving the creepage distance between the terminal 321 in each direction.

[0040] It can be imagined that in some embodiments, the shape of the pouring terminal 320 can also be conical, and at this time, the umbrella skirt structure 322 can also be arranged to improve the creepage distance between the terminal 321.

[0041] In the embodiment, the plurality of umbrella skirt forming grooves 202 are arranged along the central axis of the terminal pouring cavity 201. The plurality of umbrella skirt forming grooves 202 are arranged to form a plurality of umbrella skirt structures 322 at the pouring terminal 320, so as to further increase the distance between the different terminals 321 along the outer surface of the insulating sleeve, i.e., to further increase the creepage distance between the different terminals 321.

[0042] Specifically, the winding 300 has thirteen umbrella skirt structures 322 at the pouring terminal 320. It can be imagined that in other embodiments, the number of umbrella skirt structures 322 at the pouring terminal 320 can also be one, two, three, four or more, and a person skilled in the art can configure it according to actual needs.

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

[0044] Specifically, the depth direction of the umbrella skirt forming groove 202 is perpendicular to the central axis of the terminal pouring cavity 201, which facilitates the demolding of the umbrella skirt structure 322.

[0045] In the 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 pouring cavity 201, and the terminal cover mold 220 is arranged at one end of the two terminal side molds 210 away from the main body pouring cavity 101. The terminal cover mold 220 and the two terminal side molds 210 form the terminal pouring cavity 201, and 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 main body 100 is detachably connected to the mold main body 100. The umbrella skirt forming groove 202 is located in the terminal side mold 210.

[0046] After the winding 300 is poured, demolding is needed. Since the umbrella skirt forming groove 202 is located in the circumferential cavity wall of the terminal pouring cavity 201, i.e., the umbrella skirt forming groove 202 is located in the terminal side mold 210. When demolding, the terminal cover plate is first removed, and then the two terminal side molds 210 are split away from each other, so that the umbrella skirt structure 322 is out of the umbrella skirt forming groove 202. The demolding method is relatively simple and avoids damaging the pouring 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 pouring cavity. A screw is arranged in the through hole and is screwed into the threaded hole, thereby achieving detachable connection of the terminal cover mold 220 and the terminal side mold 210. The two terminal side molds 210 are also detachably connected to the mold main body 100 by screw locking at one end close to the pouring cavity. The two ends of the terminal side mold 210 are respectively connected to the terminal cover plate and the mold main body 100, thereby achieving detachable connection between the two terminal side molds 210.

[0048] It can be imagined 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, detachable connection by using a lock buckle; the two terminal side molds 210 can also be detachably connected by using a lock buckle; and the terminal side mold 210 and the mold main body 100 can also be detachably connected by using a lock buckle.

[0049] In an embodiment, the terminal side mold 210 is provided with a handle mounting hole 211. Since the temperature of the terminal side mold 210 is high when it is removed after pouring, the handle mounting hole 211 is arranged on the terminal side mold 210, a clamping handle can be installed, and a tool can be used to clamp the clamping handle to remove 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 a screw. It can be imagined that in other embodiments, the handle mounting hole 211 can also be a light hole, and the clamping handle is inserted into the handle mounting hole 211 and fixed by welding or other methods.

[0051] In an 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 action of pouring pressure, which is beneficial to the molding of the pouring terminal 320.

[0052] Specifically, the limiting block 212 is in the shape of a semicircular arc, the limiting blocks 212 of the two terminal side molds 210 are butted, forming an annular block, and the limiting groove 221 is a circular groove. It can be imagined that in other embodiments, the limiting block 212 can be arranged on the terminal cover mold 220, and the limiting groove 221 can be arranged on the terminal side mold 210; the limiting block 212 and the limiting groove 221 can be other shapes.

[0053] Specifically, the terminal cover mold 220 is provided with an adaptive hole 222 for accommodating the outer end of the terminal 321. When the coil is placed in the pouring mold, the outer end of the terminal 321 needs to be inserted into the adaptive hole 222, so as to avoid that the insulating material completely covers the outer end of the terminal 321 when the insulating material is poured.

[0054] In the embodiment, 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. 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 on 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 on 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 to form a main pouring 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 pouring cavity 201 is communicated with the main pouring cavity 101 through the overflow hole 151. The above-mentioned mold body 100 can form a main pouring cavity 101 in a nearly cylindrical shape, and has a simple structure and is easy to implement. The insulating material first enters the main pouring cavity 101 from the pouring port 102, and then enters the terminal pouring cavity 201 through the overflow hole 151.

[0055] Specifically, the overflow hole 151 of the terminal panel 150 is provided with a sealing ring around the hole port, and the sealing ring is clamped between the terminal side mold 210 and the terminal panel 150. When the terminal side mold 210 and the terminal panel 150 are detachably connected, the sealing effect is good during assembly.

[0056] In the embodiment, the terminal panel 150 is also detachably connected to the outer mold plate 120, and the terminal panel 150 is further provided with a tapping pouring groove for pouring a tapping terminal. The terminal panel 150 can be detachably connected to the outer mold plate 120 by screw locking, clamping and the like.

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

[0058] Referring to Figure 6 The utility model discloses further disclose a dry variable winding 300, use above-mentioned pouring mold to make. Because adopted above-mentioned pouring mold, make the dry variable winding 300's pouring terminal 320 place has the umbrella skirt structure, improve the creepage distance between different terminal, improve the operation reliability.

[0059] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

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

Claims

1. A dry-vari winding casting mold characterized by, The utility model relates to a mould for manufacturing terminal, which comprises: a mould body (100) provided with a cylindrical main body pouring cavity (101), the mould body (100) is provided with a pouring gate (102) communicated to the main body pouring cavity (101); a terminal forming assembly (200) arranged outside the mould body (100), the terminal forming assembly (200) is provided with a terminal pouring cavity (201), the terminal pouring cavity (201) is communicated with the main body pouring cavity (101), and the cavity wall of the terminal pouring cavity (201) is concavely provided with an umbrella skirt forming groove (202).

2. The dry-rope-winding casting mold according to claim 1, characterized in that: The umbrella skirt forming groove (202) has a narrowing trend along the direction from the groove mouth to the groove bottom.

3. The dry-rope-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 wall and the groove bottom wall are smoothly connected.

4. The dry-rope-winding pouring mold according to claim 1, characterized in that: The terminal pouring cavity (201) is cylindrical, the umbrella skirt forming groove (202) is located at the circumferential cavity wall of the terminal pouring cavity (201), and the umbrella skirt forming groove (202) is an annular groove arranged around the central axis of the terminal pouring cavity (201).

5. The dry-rope-winding casting mold according to claim 4, characterized in that: The umbrella skirt forming groove (202) is provided with at least two, and all the umbrella skirt forming grooves (202) are arranged at intervals along the central axis of the terminal pouring cavity (201).

6. The dry-rope-winding casting mold according to claim 4, characterized in that: The terminal forming assembly (200) comprises two terminal side moulds (210) and a terminal cover mould (220), the two terminal side moulds (210) are arranged around the central axis of the terminal pouring cavity (201), the terminal cover mould (220) is arranged at one end of the two terminal side moulds (210) away from the main body pouring cavity (101), the terminal cover mould (220) and the two terminal side moulds (210) form the terminal pouring cavity (201), the two terminal side moulds (210) are detachably connected, the terminal side mould (210) and the terminal cover mould (220) are detachably connected, one end of the terminal side mould (210) close to the mould body (100) is detachably connected with the mould body (100), and the umbrella skirt forming groove (202) is located at the terminal side mould (210).

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

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

9. The dry-rope-winding pouring 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), 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 on 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 on 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 to form the main body pouring 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 pouring cavity (201) communicates with the main body pouring cavity (101) through the overflow hole (151).

10. A dry-rope winding, characterized in that The dry winding pouring mold is made by using any one of claims 1 to 9.

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