Die for pouring dry-type phase-shifting transformer with epoxy resin

Abstract

The utility model discloses an epoxy resin pouring dry-type phase-shifting transformer mould, which comprises a pouring outer mould, a pouring inner mould, a pouring outer mould, a pouring inner mould and a pouring outer mould, and is characterized in that the pouring outer mould comprises a first inclined part, an arc part and a second inclined part; the wire outlet sealing plate is connected with the first inclined part and the second inclined part; the mold defined by the pouring outer mold and the outgoing line sealing plate is arranged on the secondary winding of the phase-shifting transformer in a sleeving mode, the outgoing line sealing plate is connected with the arc part through the first inclined part and the second inclined part, and compared with a traditional mode that the outgoing line sealing plate is directly located in the tangential direction of an arc structure, the space between the outer surface of the secondary winding and the outgoing line sealing plate can be enlarged; and lead arrangement during die filling is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of phase-shifting transformers, in particular to a mold for epoxy resin-cast dry-type phase-shifting transformers. Background Art

[0002] With increasing public interest in energy storage, charging stations, and high-voltage frequency conversion, phase-shifting transformers are playing an increasingly important role. As engineering production pursues higher performance and diverse application environments, epoxy resin-cast dry-type phase-shifting transformers are poised to become a key category of phase-shifting transformers.

[0003] Currently, most phase-shifting transformers use an impregnated structure, which easily accumulates dust on the winding surface during operation. This makes subsequent maintenance complex and unsuitable for use in harsh environments. Epoxy resin-cast dry-type phase-shifting transformers effectively address these issues, simplifying and facilitating subsequent maintenance. This plays a crucial role in ensuring product quality and enhancing market competitiveness.

[0004] In the process of implementing the technical method of the embodiment of the utility model, the inventors of this application found that there are at least the following technical problems in the prior art:

[0005] The secondary winding of an epoxy resin-cast dry-type phase-shifting transformer consists of multiple subgroups. These windings have numerous lead wires, all of which exit from the same side. Existing molds for epoxy resin-cast dry-type phase-shifting transformers consist of an outer mold and a lead wire cover. The outer mold is an arc-shaped structure, with the lead wire cover located on a tangent to the arc. Because the secondary windings have numerous lead wires and exit from the same side, the existing space between the lead wire cover and the secondary winding is limited, making lead wire routing difficult during mold assembly.

[0006] In summary, the existing epoxy resin cast dry-type phase-shifting transformer mold cannot meet the actual mold installation requirements. Utility Model Content

[0007] The embodiment of the utility model provides a mold for an epoxy resin cast dry-type phase-shifting transformer, which solves the problem that the existing epoxy resin cast dry-type phase-shifting transformer mold cannot meet actual mold installation requirements.

[0008] The present invention provides a mold for an epoxy resin cast dry-type phase-shifting transformer, comprising:

[0009] The casting outer mold includes a first inclined portion, an arc portion, and a second inclined portion connected in sequence;

[0010] an outlet sealing plate connecting the first inclined portion and the second inclined portion;

[0011] The mold formed by the casting outer mold and the wire-outlet sealing plate is sleeved on the secondary winding of the phase-shifting transformer. The wire-outlet sealing plate is connected to the arc portion through the first inclined portion and the second inclined portion respectively, which can increase the space between the outer surface of the secondary winding and the wire-outlet sealing plate, and facilitate the lead arrangement during mold installation.

[0012] Optionally, the central angle of the arc portion is greater than 180 degrees but less than 360 degrees.

[0013] Optionally, the inclination direction of the first inclined portion is the same as the tangent direction at the first end point of the arc portion.

[0014] Optionally, the inclination direction of the second inclined portion is the same as the tangent direction at the second end point of the arc portion.

[0015] Optionally, a plurality of wire nuts are provided on the wire outlet sealing plate, and different wire nuts correspond to the lead wires of different windings in the secondary winding. The lead wires of each winding are flush with the corresponding wire nuts in the axial direction, and the spacing between the wire nuts is the same.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0017] The casting outer mold of the present invention includes a first inclined portion, an arc portion and a second inclined portion. The wire-outlet sealing plate is connected to the arc portion through the first inclined portion and the second inclined portion respectively. Compared with the traditional wire-outlet sealing plate directly located in the tangent direction of the arc structure, it can increase the space between the outer surface of the secondary winding and the wire-outlet sealing plate, which is convenient for the lead arrangement during mold assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a top view of a mold for an epoxy resin cast dry-type phase-shifting transformer in one embodiment of the present utility model;

[0019] Figure 2 This is a left side view of a mold for an epoxy resin cast dry-type phase-shifting transformer in one embodiment of the present utility model;

[0020] Figure 3 This is a front view of a mold of an epoxy resin cast dry-type phase-shifting transformer in one embodiment of the present utility model;

[0021] In the figure: 10 - casting outer mold; 11 - first inclined portion; 12 - arc portion; 13 - second inclined portion; 121 - first end point; 122 - second end point; 20 - outlet sealing plate; 21 - wiring nut. DETAILED DESCRIPTION

[0022] The embodiment of the utility model provides a mold for an epoxy resin cast dry-type phase-shifting transformer, which solves the problem that the existing epoxy resin cast dry-type phase-shifting transformer mold cannot meet actual mold installation requirements.

[0023] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be internal communication between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood based on specific circumstances.

[0024] To better understand the aforementioned epoxy resin-cast dry-type phase-shifting transformer mold, the following detailed description is provided in conjunction with the accompanying drawings and specific implementation methods. Obviously, the embodiments described herein represent only a portion of the embodiments, not all of them. Based on the embodiments herein, all other embodiments derived by persons of ordinary skill in the art without inventive effort are considered within the scope of protection of this utility model.

[0025] The primary winding of the epoxy resin cast dry-type phase-shifting transformer of the present invention is inside, and the secondary winding is outside. Since there are many secondary winding groups, the secondary winding is composed of multiple independent groups. If the wire gauge selection or the number of turns is not arranged properly, the height of the entire winding cannot be controlled, and the insulation distance between the groups and between the leads cannot be guaranteed, which can easily cause local discharge. In order to avoid local discharge, the secondary winding of the present invention adopts a multi-stage layered structure. The wire gauge of the phase-shifting group and the basic group are selected to have the same thickness. The number of turns, height and thickness of each group are reasonably arranged, which is conducive to balancing the impedance of the group. It can also control the overall height of the winding, ensure that there is enough distance between the leads, between the groups and between the large groups, and the distance is uniform, and ensure that the radial dimensions of different groups are the same to meet the voltage resistance requirements.

[0026] In the epoxy resin cast dry-type phase-shifting transformer of the present invention, since the current size and wire gauge width of the phase-shifting group and the basic group are different, and the number of turns of each group is different, by optimizing the arrangement of the wire turns of each group and adopting fractional turns when necessary, the axial height and radial thickness of each group are ensured to be the same, and the impedance difference between the groups is minimized as much as possible; during the winding process, the lead wires are led out as close to the group as possible to ensure the insulation distance between the lead wires.

[0027] Please refer to the following Figure 1-3The embodiment of the present invention provides an epoxy resin cast dry-type phase-shifting transformer mold, including a casting outer mold 10 and an outlet sealing plate 20. The mold formed by the casting outer mold 20 and the outlet sealing plate 20 is sleeved on the secondary winding of the phase-shifting transformer.

[0028] The casting outer mold 10 includes a first inclined portion 11 , an arc portion 12 and a second inclined portion 13 connected in sequence.

[0029] The outgoing line sealing plate 20 connects the first inclined portion 11 and the second inclined portion 13 .

[0030] The epoxy resin cast dry-type phase-shifting transformer of the present invention has many outgoing wires, and the outgoing wires are all on the same side. The outgoing wire sealing plate 20 is connected to the arc portion 12 through the first inclined portion 11 and the second inclined portion 13. Compared with the conventional outgoing wire sealing plate directly located in the tangent direction of the arc structure, the outgoing wire sealing plate 20 of the present invention is spaced apart from the conventional outgoing wire sealing plate. Figure 1 As shown, the distance between the two is 70 mm. Therefore, the utility model can increase the space between the outer surface of the secondary winding and the lead sealing plate 20, which is convenient for the lead arrangement during the mold assembly.

[0031] The central angle of the arc portion 12 is greater than 180 degrees but less than 360 degrees. The first inclined portion 11, the arc portion 12, the second inclined portion 13 and the outlet sealing plate 20 are enclosed together to form a cylindrical structure similar to a cylinder.

[0032] The inclination direction of the first inclined portion 11 is the same as the tangent direction of the first endpoint 121 of the arc portion 12, which can directly lead out the lead wire of the secondary winding at the first endpoint 121 of the arc portion without bending the lead wire, thereby avoiding damage to the lead wire and improving the service life.

[0033] The inclination direction of the second inclined portion 13 is the same as the tangent direction of the second end point 122 of the arc portion 12, which can directly lead out the lead wire of the secondary winding at the second end point 122 of the arc portion without bending the lead wire, thereby avoiding damage to the lead wire and improving the service life.

[0034] Several wire nuts 21 are provided on the lead-out sealing plate 20. Different wire nuts 21 correspond to the lead-out wires of different windings in the secondary winding. To facilitate lead-out, the lead-out wires need to be welded to the wire nuts 21. Before welding, the lead-out wire routing must be arranged in advance. The lead-out wires of each winding are aligned axially with the corresponding wire nuts 21, and the spacing between the wire nuts 21 is the same. This ensures that the lead-out wires and wire nuts are neatly and beautifully arranged when welded, reduces cross-over of the leads, ensures that the insulation distance between the leads meets the requirements, reduces the probability of partial discharge between the leads, and facilitates the user's external wiring.

[0035] Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if such modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.

Claims

1. A mold for epoxy resin casting dry-type phase-shifting transformer, characterized in that: include: A casting outer mold (10) comprising a first inclined portion (11), an arc portion (12), and a second inclined portion (13) connected in sequence; An outlet sealing plate (20) connecting the first inclined portion (11) and the second inclined portion (13); The mold formed by the casting outer mold (10) and the outlet sealing plate (20) is sleeved on the secondary winding of the phase-shifting transformer. The outlet sealing plate (20) is connected to the arc portion (12) through the first inclined portion (11) and the second inclined portion (13), respectively, which can increase the space between the outer surface of the secondary winding and the outlet sealing plate (20), thereby facilitating the arrangement of the leads during molding.

2. The mold according to claim 1, wherein The central angle of the arc portion (12) is greater than 180 degrees but less than 360 degrees.

3. The mold according to claim 1, wherein The inclination direction of the first inclined portion (11) is the same as the tangent direction of the first end point (121) of the arc portion (12).

4. The mold according to claim 1, wherein The inclination direction of the second inclined portion (13) is the same as the tangent direction of the second end point (122) of the arc portion (12).

5. The mold according to claim 1, wherein A plurality of wiring nuts (21) are provided on the outlet sealing plate (20), and different wiring nuts (21) correspond to lead wires of different windings in the secondary winding. The lead wires of each winding are flush with the corresponding wiring nuts (21) in the axial direction, and the spacing between the wiring nuts (21) is the same.

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