Epoxy potting center positioning device for toroidal transformer

Abstract

The utility model relates to an epoxy casting center positioning device of annular transformer belongs to transformer manufacturing technical field, and this device includes: base is provided with the vertical fixed epoxy positioning rod, positioning round plate, the center is provided with the center hole for the sleeve into epoxy positioning rod, a plurality of locating blocks, the radial direction of active connection in positioning round plate is used for through the position adjustment clamping different outer diameter annular transformer coil, and makes the center hole of positioning round plate with annular transformer coil center line coaxial, wherein, when the center hole of positioning round plate is sleeved into the epoxy positioning rod, can make the center line of annular transformer coil placed on the base with the center axis of epoxy positioning rod coaxial. The utility model solves the installation and structural stability problem that the high -power transformer brings in the epoxy casting process because of the eccentricity of center hole.

Description

Technical Field

[0001] This utility model relates to the field of transformer manufacturing technology, and in particular to a positioning device for epoxy casting center of annular transformers. Background Technology

[0002] To improve insulation performance and structural stability, toroidal transformers typically require epoxy resin to be poured into the central hole, and a fixing screw to be installed in the central hole of the resin to mount the transformer onto a sheet metal plate.

[0003] When casting epoxy resin into a toroidal transformer, the epoxy positioning rod must be precisely aligned with the center line of the transformer coil's central hole to ensure coaxiality. For small, lightweight transformers, operators can easily move the transformer and align the center line of the coil's central hole with the epoxy positioning rod. However, as transformer power, size, and weight increase (e.g., power reaching 4KW, weight exceeding 30Kg, outer diameter reaching 280mm, height 130mm and above), manual movement becomes difficult during epoxy resin casting. Furthermore, it is challenging to accurately determine center alignment visually, resulting in low operational efficiency and poor positioning accuracy. This can easily lead to misalignment between the epoxy resin center hole and the transformer coil's center line, i.e., center hole eccentricity. This eccentricity causes the transformer's installation center to shift, leading to instability in the overall center of gravity, increased vibration, and even affecting the transformer's electrical performance and service life. Utility Model Content

[0004] Therefore, it is necessary to provide a toroidal transformer epoxy casting center positioning device to address the installation and structural stability issues caused by the eccentricity of the center hole during the epoxy casting process of high-power transformers.

[0005] This utility model provides a toroidal transformer epoxy casting center positioning device, comprising:

[0006] The base is equipped with a vertically fixed epoxy positioning rod;

[0007] A positioning circular plate has a central hole for fitting the epoxy positioning rod.

[0008] Multiple positioning blocks are movably connected to the radial side of the positioning circular plate, used to clamp toroidal transformer coils of different outer diameters by adjusting their positions, and to make the center hole of the positioning circular plate coaxial with the center line of the toroidal transformer coil.

[0009] When the central hole of the positioning circular plate is fitted into the epoxy positioning rod, the center line of the annular transformer coil placed on the base is made coaxial with the central axis of the epoxy positioning rod.

[0010] In one embodiment, the number of positioning blocks is at least three, and they are evenly distributed on the circumference of the positioning circular plate.

[0011] In one embodiment, the positioning block has an elongated hole extending radially along the positioning disc and is movably mounted on the positioning disc by fasteners.

[0012] In one embodiment, the elongated hole is a waist-shaped hole.

[0013] In one embodiment, the positioning block is provided with a scale for indicating the adjustment position.

[0014] In one embodiment, the scale is adjustable within a range of ±20 mm.

[0015] In one embodiment, a sponge pad is provided on the base, and the central hole of the sponge pad is fitted onto the epoxy positioning rod.

[0016] In one embodiment, foam is attached to the back of the positioning disc.

[0017] In one embodiment, the positioning blocks have gaps between them for leading out the transformer coil lead-out harness.

[0018] In one embodiment, the epoxy positioning rod is marked with a mark for indicating the epoxy resin pouring height.

[0019] The aforementioned epoxy casting center positioning device for toroidal transformers uses an epoxy positioning rod vertically fixed to the base as an absolute reference axis. By utilizing the central hole on the positioning circular plate and its engagement with the epoxy positioning rod, the geometric center of the positioning circular plate is quickly aligned with the axis of the epoxy positioning rod. Furthermore, multiple positioning blocks, movably connected radially to the positioning circular plate, adjust and clamp toroidal transformer coils of different outer diameters, forcing the coil's centerline to automatically align with the central hole of the positioning circular plate. Thus, when the coil with the positioning circular plate is placed on the base, the engagement of the central hole and the positioning rod precisely achieves coaxial positioning of the toroidal transformer coil's centerline with the epoxy positioning rod's central axis in a single operation. This completely solves the problems of low efficiency and eccentricity associated with traditional manual visual adjustment methods, ensuring the centering accuracy of the epoxy casting center hole and significantly improving production efficiency and product consistency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1A schematic diagram of an epoxy casting center positioning device for a toroidal transformer according to one embodiment;

[0022] Figure 2 for Figure 1 Top view;

[0023] Figure 3 This is a schematic diagram of a positioning block according to one embodiment.

[0024] Figure label:

[0025] 110. Base; 112. Epoxy positioning rod; 114. Sponge pad; 50. Toroidal transformer coil; 52. Wire harness; 120. Positioning round plate; 130. Positioning block; 132. Long hole; 60. Epoxy resin. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this specification are for illustrative purposes only and do not represent the only possible implementation.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this specification belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0031] The following is combined with Figures 1-3 This invention describes a toroidal transformer epoxy casting center positioning device.

[0032] like Figure 1 and Figure 2 As shown, in one embodiment, a toroidal transformer epoxy casting center positioning device includes a base 110, a positioning circular plate 120, and a positioning block 130.

[0033] The base 110 is equipped with a vertically fixed epoxy positioning rod 112. Optionally, the base 110 and the epoxy positioning rod 112 can be welded together. A sponge pad 114 is provided on the base 110, with its central hole fitting onto the epoxy positioning rod 112, allowing the sponge pad 114 to lie flat against the surface of the base 110. When the operator places the heavy toroidal transformer coil 50 onto the base 110, the sponge pad 114 provides cushioning and protection, preventing direct collision or friction between the bottom of the toroidal transformer coil 50 and the hard surface of the base 110, thus avoiding damage to the coil's insulation layer. Simultaneously, the soft pad helps the toroidal transformer coil 50 remain stable after placement, preventing it from deviating from its centered position due to slight slippage. This further ensures the accuracy of the alignment between the epoxy positioning rod 112 and the centerline of the toroidal transformer coil 50, improving operational safety and the reliability of the casting quality.

[0034] The positioning circular plate 120 has a central hole for fitting the epoxy positioning rod 112. Foam (not shown) is attached to the back of the positioning circular plate 120 to protect the transformer coil 50. This foam (not shown) is fixed to the entire back surface of the positioning circular plate 120 by adhesive bonding. It is soft and has a certain thickness. When the positioning block is adjusted according to the outer diameter of the coil and the positioning circular plate 120 is placed on the upper surface of the transformer coil 50, the foam (not shown) on the back directly contacts the coil surface, using its own elastic deformation to buffer the contact pressure and prevent the hard positioning circular plate 120 body from directly scratching or damaging the insulation layer or enameled wire on the surface of the transformer coil 50. At the same time, the soft foam (not shown) contact surface allows the positioning circular plate 120 to have a certain degree of self-adaptability during placement, preventing slight unevenness of the coil surface from affecting the horizontal placement of the positioning circular plate 120. This further ensures the accuracy and stability of the alignment between the central hole and the epoxy positioning rod 112, improving protection and operational reliability.

[0035] Multiple positioning blocks 130 are movably connected radially to the positioning circular plate 120, used to clamp toroidal transformer coils 50 of different outer diameters by adjusting their positions, and to ensure that the center hole of the positioning circular plate 120 is coaxial with the center line of the toroidal transformer coil 50. Specifically, when the center hole of the positioning circular plate 120 is fitted into the epoxy positioning rod 112, the center line of the toroidal transformer coil 50 placed on the base 110 is made coaxial with the central axis of the epoxy positioning rod 112, thereby ensuring that the center hole does not shift during epoxy pouring. The number of positioning blocks 130 is set to at least three, preferably four. The positioning blocks 130 are evenly distributed on the circumference of the positioning circular plate 120, forming a symmetrical structure. Each positioning block 130 is movably connected to the radial direction of the positioning circular plate 120, can slide along the radial direction of the positioning circular plate 120 and can be fixed on the positioning circular plate 120, thereby allowing the radial sliding adjustment of the position to accommodate toroidal transformer coils of different outer diameters (such as coils with an outer diameter of 280mm), and is fixed to the edge of the transformer coil 50 by clamping action, so that the center hole of the positioning circular plate 120 is coaxial with the center line of the coil. At the same time, the gaps between the multiple positioning blocks 120 are used to lead out the lead wire bundle 52 of the transformer coil 50, ensuring that the arrangement of the lead wire bundle 52 is not interfered with during operation. When the center hole of the positioning circular plate 120 is fitted into the epoxy positioning rod 112, this evenly distributed structure ensures that the center line of the coil and the center axis of the epoxy positioning rod 112 are precisely coincident, avoiding errors caused by manual handling and visual alignment. Because there are at least three positioning blocks evenly distributed around the circumference, multi-point symmetrical clamping force is provided, ensuring that the toroidal transformer coil is subjected to uniform force during clamping, preventing center offset or eccentricity caused by single-point or asymmetrical support. Specifically, the even distribution of the four positioning blocks further enhances stability and adaptability, enabling operators to quickly adjust and fix coils of different sizes (such as those with an outer diameter of 240-320mm), significantly improving positioning accuracy and operational efficiency, reducing physical exertion and downtime when moving heavy transformers (such as those weighing over 30kg), ensuring that the epoxy casting center hole is completely coaxial with the coil centerline, avoiding instability or vibration problems during subsequent installation, and improving product quality and reliability.

[0036] This embodiment, through the adjustable design of the positioning block 130, can adapt to toroidal transformer coils 50 with different outer diameters, achieving rapid and accurate positioning. This ensures that the center line of the transformer coil 50 is coaxial with the center axis of the epoxy positioning rod 112, avoiding the difficulties of manual handling and alignment, improving work efficiency and accuracy, ensuring the accurate center position of the toroidal transformer fixing screw (epoxy positioning rod 112) assembly, preventing the problem of epoxy casting center hole offset, thereby ensuring the installation stability and overall performance of the transformer.

[0037] like Figure 3As shown, in one embodiment, the positioning block 130 has an elongated hole, specifically a slotted hole, extending radially along the positioning circular plate 120, and is movably mounted on the positioning circular plate 120 by fasteners. The positioning block 130 is provided with a scale for indicating the adjustment position, the scale being set along the direction of the elongated hole 132, with an adjustment range of ±20mm. The fasteners include a screw and a nut, wherein the screw shank passes through a countersunk hole on the back of the positioning circular plate 120, and then through the elongated hole 132 of the positioning block 130 before being locked by the nut, with the nut portion resting within the countersunk hole. The positioning block 130 is movably mounted on the positioning circular plate through the slotted hole and the fasteners, forming a slidable connection. During operation, the positioning block 130 can slide radially along the positioning circular plate 120 by loosening the fasteners, thereby adjusting its position relative to the center of the circular plate to accommodate toroidal transformer coils of different outer diameters (e.g., 280mm outer diameter). The position is adjusted by the scale indication on the oblong hole. After adjusting to the desired position, tightening the fasteners will reliably lock the positioning block 130, allowing multiple positioning blocks to clamp the edge of the coil and ensuring that the center hole of the positioning circular plate is coaxial with the center line of the coil. At the same time, the gap between the positioning blocks provides a lead-out channel for the transformer coil lead-out harness 52. The movable connection between the oblong hole and the fasteners allows the positioning blocks to achieve continuous and precise radial position adjustment and reliable locking, ensuring adaptability when clamping coils of different outer diameters (e.g., 240-320mm range), and improving the accuracy of adjustment and operational efficiency through the scale indication. This structure allows the fixture to be quickly adapted to various transformer specifications, significantly reducing manual handling and alignment time, avoiding center offset caused by uneven clamping force or inaccurate positioning, and ensuring that the epoxy casting center is strictly coaxial with the coil center.

[0038] In one embodiment, see Figure 1 The epoxy positioning rod 112 is marked with a mark to indicate the pouring height of epoxy resin 60, such as a clear circular line or numerical marking. This mark is pre-set at a specific height position on the epoxy positioning rod according to the product process requirements. After the center positioning of the transformer coil is completed, when the operator removes the positioning disc 120 and pours epoxy resin 60 into the central hole of the coil, this mark serves as a visual reference, indicating the precise height position that the pouring liquid level should reach, ensuring that the depth of epoxy resin 60 poured each time is consistent and meets the design requirements.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above-described embodiments are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. An epoxy potting center positioning device for toroidal transformers, characterized by, include: The base is equipped with a vertically fixed epoxy positioning rod; A positioning circular plate has a central hole for fitting the epoxy positioning rod. Multiple positioning blocks are movably connected to the radial side of the positioning circular plate, used to clamp toroidal transformer coils of different outer diameters by adjusting their positions, and to make the center hole of the positioning circular plate coaxial with the center line of the toroidal transformer coil. When the central hole of the positioning circular plate is fitted into the epoxy positioning rod, the center line of the annular transformer coil placed on the base is made coaxial with the central axis of the epoxy positioning rod.

2. The toroidal transformer epoxy potting centering device of claim 1, wherein, The number of positioning blocks is at least three, and they are evenly distributed on the circumference of the positioning circular plate.

3. The toroidal transformer epoxy potting centering device of claim 1, wherein, The positioning block has an elongated hole extending radially along the positioning circular plate and is movably mounted on the positioning circular plate by fasteners.

4. The toroidal transformer epoxy potting centering device of claim 3, wherein, The elongated hole is a waist-shaped hole.

5. The toroidal transformer epoxy potting centering device of claim 1, wherein, The positioning block is provided with a scale for indicating the adjustment position.

6. The epoxy casting center positioning device for a toroidal transformer according to claim 5, characterized in that, The scale adjustment range is ±20mm.

7. The epoxy casting center positioning device for a toroidal transformer according to claim 1, characterized in that, A sponge pad is provided on the base, and the central hole of the sponge pad is fitted onto the epoxy positioning rod.

8. The epoxy casting center positioning device for a toroidal transformer according to claim 1, characterized in that, Foam is attached to the back of the positioning circular plate.

9. The epoxy casting center positioning device for a toroidal transformer according to claim 1, characterized in that, The positioning blocks have gaps between them for leading out the transformer coil lead-out harness.

10. The toroidal transformer epoxy casting center positioning device according to any one of claims 1 to 9, characterized in that, The epoxy positioning rod is marked with a mark to indicate the epoxy resin pouring height.

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