Distribution transformer long circular coil shaping device
By combining hydraulic and clamping devices, the problem of difficult assembly caused by the excessive size of the long oval coil after winding was solved, achieving stable curing of the coil and improving its mechanical strength, thereby enhancing the transformer's short-circuit withstand capability.
Patent Information
- Application Number
- CN202511812573.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-04
- Publication Date
- 2026-02-27
AI Technical Summary
In the existing technology, the straight section of the elongated oval coil is too large after winding, which makes it difficult to assemble. The short axis of the coil is also too large, resulting in insufficient phase spacing and difficulty in assembling the device body.
Using a hydraulic device and a clamping device, the short shaft of the coil is pressed to the design size by a hydraulic cylinder, and then fastened with a clamping screw before entering a drying oven for curing and shaping.
The coil size was effectively compressed, solving the gap problem between layers in the straight section of the coil, enhancing the mechanical strength of the coil, and improving the transformer's short-circuit withstand capability.
Smart Images
Figure CN121583767A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of coil shaping, and particularly relates to a long-circular coil shaping device for distribution transformer. BACKGROUND
[0002] In order to design a more economical transformer structure and reduce product manufacturing cost, the coil of a distribution transformer is gradually changed into a long-circular coil, which is similar in structure to a runway, and a straight section is added in the middle of the circular coil. Compared with the circular coil, the long-circular coil has a reduced short-axis size, which can effectively reduce the size of the core MO.
[0003] However, in the prior art, due to winding process problems, the straight section of the low-voltage coil is usually processed into an arc shape, and the short-axis size of the wound coil is larger than the design value, while the size margin of the core MO is small, causing difficulty in assembly. At present, the common method is to knock the wire of the straight section during winding to make the wire adhere to the mold as much as possible. However, since the semi-hard copper wire has high hardness, the knocking method cannot completely make the wire adhere to the mold, and the efficiency is low.
[0004] Therefore, in terms of coil winding, the short-axis winding of the coil is still larger, the coil assembly causes insufficient phase-to-phase distance, and the body assembly is difficult. SUMMARY
[0005] The application provides a long-circular coil shaping device for distribution transformer, which solves the problems of the current coil short-axis winding being larger, the coil assembly causing insufficient phase-to-phase distance, and the body assembly being difficult.
[0006] In order to solve the above technical problems, the technical scheme of the application is that the long-circular coil shaping device for distribution transformer comprises a hydraulic device, a coil assembly, and a clamping device.
[0007] The hydraulic device comprises a vertical plate, a baffle plate arranged on the vertical plate, a fixed plate, and a hydraulic cylinder. The hydraulic cylinder is fixedly connected with the fixed plate through a fixed flange. The baffle plate is located at one end of the vertical plate, and the fixed plate is located at the other end of the vertical plate. The extension end of the hydraulic cylinder is arranged towards the baffle plate.
[0008] The coil assembly comprises at least three coils arranged in sequence along the radial direction. The coil assembly is arranged in the clamping assembly, and the clamping assembly is arranged between the baffle plate and the vertical plate of the hydraulic device.
[0009] In a preferred embodiment of the application, the upper portion of the vertical plate is provided with a bottom plate, and the baffle plate and the fixed plate are fixed to the bottom plate.
[0010] In a preferred embodiment of the present application, a reinforcing plate is arranged on the side of the baffle plate away from the hydraulic cylinder, and a transverse support plate and a longitudinal support plate are arranged on the side of the fixed plate away from the baffle plate.
[0011] In a preferred embodiment of the present application, the hydraulic cylinder is connected with the fixed plate through a fixed flange, the fixed flange is fixedly connected with the fixed plate, and the hydraulic cylinder passes through the fixed plate and is connected with the fixed flange.
[0012] In a preferred embodiment of the present application, the clamping device comprises four limiting channel steels arranged in parallel, a plurality of partition plates, and radial tensioning screws, the limiting channel steels are arranged along the arrangement direction of the coil, the partition plates are arranged at intervals with the coil, the radial tensioning screws are arranged above the coil assembly, and the two ends of the radial tensioning screws are connected with the partition plates at the two ends of the coil assembly.
[0013] In a preferred embodiment of the present application, two limiting channel steels are arranged above the coil assembly, two limiting channel steels are arranged below the coil assembly, and the radial tensioning screws are arranged between the two limiting channel steels.
[0014] In a preferred embodiment of the present application, a support member is arranged between the limiting channel steel and the coil assembly.
[0015] In a preferred embodiment of the present application, the two limiting channel steels arranged on the same side of the coil assembly are connected through axial tensioning screws.
[0016] In a preferred embodiment of the present application, when the clamping device is placed on the hydraulic device, the extension end of the hydraulic cylinder and the center of the partition plate are at the same height.
[0017] In a preferred embodiment of the present application, the use method comprises the following steps:
[0018] S1: temporarily clamping the wound coil by using the clamping device;
[0019] S2: hoisting the temporarily clamped coil on the hydraulic device;
[0020] S3: pressurizing the coil in the short axis direction to a design value through the hydraulic cylinder, manually tightening the nut on the transverse tensioning screw, releasing the pressure of the hydraulic cylinder, and curing and shaping the coil in the drying furnace.
[0021] Compared with the prior art, the technical scheme provided by the present application has the following advantages:
[0022] The present application is a shaping device, through hydraulic device to press the coil short shaft to the design size, fasten the compression screw rod, enter the drying furnace to dry and solidify. The device has simple structure and low manufacturing cost. The coil size can be effectively compressed, and the coil does not rebound after solidification. At the same time, the gap between layers of the straight part of the coil is solved, so that the whole coil is bonded integrally. The present application solves the problems of coil short shaft winding too large, coil fitting causing insufficient interphase distance, and device body assembly difficulty. For low-voltage coil-wound products, both the coil width size and the coil axial size are ensured. At the same time, drying and solidification under pressure can effectively enhance the mechanical strength of the coil and improve the short-circuit resistance of the transformer. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings of embodiments according to these drawings without creative labor.
[0024] Figure 1 is a front view of a variable-length circular coil shaping device according to an embodiment of the present application;
[0025] Figure 2 is a top view of a variable-length circular coil shaping device according to an embodiment of the present application.
[0026] The drawings shown in the figure are:
[0027] 101-stand plate; 102-baffle; 103-fixed plate; 104-hydraulic cylinder; 105-bottom plate; 106-stiffener; 107-transverse support plate; 108-longitudinal support plate; 109-fixed flange; 20-coil; 301-limiting channel steel; 302-baffle; 303-radial tensioning screw; 304-support; 305-axial tensioning screw. DETAILED DESCRIPTION
[0028] In order to facilitate understanding, the variable-length circular coil shaping device will be described below in conjunction with the embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application.
[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0031] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms, and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.
[0032] A variable long circular coil 20 shaping device, comprising: a hydraulic device, a coil assembly, and a clamping device.
[0033] As shown in Figure 1 , specifically, the hydraulic device comprises a vertical plate 101, a baffle plate 102 arranged on the vertical plate 101, a fixed plate 103, and a hydraulic cylinder 104, the hydraulic cylinder 104 is fixedly connected with the fixed plate 103 through a fixed flange 109, the baffle plate 102 is located at one end of the vertical plate 101, the fixed plate 103 is located at the other end of the vertical plate 101, and the telescopic end of the hydraulic cylinder 104 is arranged towards the baffle plate 102.
[0034] In addition, in combination with Figure 1 and Figure 2As shown, a base plate 105 is provided above the upright plate 101, and a baffle 102 and a fixing plate 103 are fixed to the base plate 105. A reinforcing plate 106 is provided on the side of the baffle 102 away from the hydraulic cylinder 104, and a transverse support plate 107 and a longitudinal support plate 108 are provided on the side of the fixing plate 103 away from the baffle 102. Here, the present invention enhances the rigidity of the entire device and improves its stability by providing the base plate 105, the reinforcing plate 106, the transverse support plate 107, and the longitudinal support plate 108.
[0035] The hydraulic cylinder 104 is connected to the fixed plate 103 via a fixed flange 109. The fixed flange 109 is fixedly connected to the fixed plate 103, and the hydraulic cylinder 104 passes through the fixed plate 103 and the fixed flange 109. Specifically, the fixed flange 109 is located on the side of the fixed plate 103 near the baffle 102. The hydraulic cylinder 104 passes through the fixed plate 103 and the fixed flange 109 and is fixed as a whole. The telescopic end of the hydraulic cylinder 104 can extend or retract.
[0036] The coil assembly includes at least three coils 20 arranged radially in sequence, that is, the three coils 20 are arranged in a line.
[0037] The coil assembly is located in the clamping assembly, which is located between the baffle 102 and the vertical plate 101 of the hydraulic device.
[0038] like Figure 2 As shown, specifically, the clamping device includes four parallel limiting channel steels 301, several partitions 302, and radial tensioning screws 303.
[0039] Combination Figure 1 and Figure 2 As shown, the limiting channel steels 301 are arranged along the arrangement direction of the coils 20, with two limiting channel steels 301 positioned above the coil assembly and two limiting channel steels 301 positioned below the coil assembly. The two limiting channel steels 301 located on the same side of the coil assembly are connected by an axial tensioning screw 305.
[0040] The partition 302 is spaced apart from the coil 20. Specifically, partitions 302 are provided at both ends of the coil assembly, and partitions 302 are also provided between two adjacent coils 20. A radial tension screw 303 is provided above the coil assembly and is positioned between two limiting channel steels 301. Both ends of the radial tension screw 303 are connected to the partitions 302 at both ends of the coil assembly.
[0041] A support member 304 is provided between the limiting channel steel 301 and the coil assembly to reduce the pressure of the channel steel on the coil 20 and prevent damage to the coil 20.
[0042] When the clamping device is placed on the hydraulic device, the extension end of the hydraulic cylinder 104 is at the same height as the center of the partition plate 302. In this way, when the extension end of the hydraulic cylinder 104 is extended, the partition plate 302 in the clamping assembly is the main stress point.
[0043] Referring to Figure 1 and Figure 2 As shown in the figure, a method for using a variable-length circular coil 20 shaping device includes the following steps:
[0044] S1: temporarily clamp the wound coil 20 with the clamping device.
[0045] Here specifically, the low-voltage coil 20 is a wire-wound product. In order to prevent the axial dimension from rebounding during the compression process of the hydraulic device, the coil 20 is clamped in the axial direction with a limiting channel steel 301 and an axial tensioning screw 305.
[0046] S2: hoist the temporarily clamped coil 20 onto the hydraulic device.
[0047] S3: press the coil 20 in the short axis direction to the design value by the hydraulic cylinder 104, manually tighten the nut on the transverse tensioning screw, release the hydraulic cylinder 104, and put the coil 20 into the drying oven for curing and shaping.
[0048] The present application is to shape the coil 20 by the shaping device, press the coil 20 in the short axis direction to the design size by the hydraulic device, tighten the compression screw, and dry and cure in the drying oven. The device has a simple structure and low manufacturing cost. It can effectively compress the size of the coil 20, and the coil 20 does not rebound after curing, while solving the problem of the gap between the layers of the straight part of the coil 20, making the entire coil 20 adhere to an integral whole. The present application solves the problems of over-winding of the short axis of the coil 20, insufficient distance between coils 20 caused by the coil 20 fitting, and difficult assembly of the device body. For wire-wound low-voltage products, both the width dimension of the coil 20 and the axial dimension of the coil 20 are ensured. At the same time, drying and curing under pressure can effectively enhance the mechanical strength of the coil 20 and improve the short-circuit resistance of the transformer.
[0049] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and are not limiting. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can modify the technical solutions described in the foregoing examples, or make equivalent substitutions for some or all of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solution to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A device for shaping a long oval coil of a distribution transformer, characterized in that, include: Hydraulic devices, coil assemblies, and clamping devices; The hydraulic device includes a vertical plate, a baffle plate disposed on the vertical plate, a fixed plate, and a hydraulic cylinder. The hydraulic cylinder is fixedly connected to the fixed plate through a fixed flange. The baffle plate is located at one end of the vertical plate, the fixed plate is located at the other end of the vertical plate, and the telescopic end of the hydraulic cylinder is positioned towards the baffle plate. The coil assembly includes at least three coils arranged radially in sequence; the coil assembly is disposed in the clamping assembly, which is located between the baffle and the upright plate of the hydraulic device.
2. The transformer elongated oval coil shaping device according to claim 1, characterized in that: A base plate is provided above the upright plate, and the baffle and the fixing plate are fixed to the base plate.
3. The transformer elongated oval coil shaping device according to claim 1, characterized in that: A reinforcing plate is provided on the side of the baffle away from the hydraulic cylinder, and a transverse support plate and a longitudinal support plate are provided on the side of the fixing plate away from the baffle.
4. The transformer elongated oval coil shaping device according to claim 1, characterized in that: The hydraulic cylinder is connected to the fixed plate via a fixed flange, and the fixed flange is fixedly connected to the fixed plate. The hydraulic cylinder passes through the fixed plate and the fixed flange.
5. The transformer elongated oval coil shaping device according to claim 1, characterized in that: The clamping device includes four parallel limiting channel steels, several partitions, and a radial tensioning screw; the limiting channel steels are arranged along the coil arrangement direction, the partitions are spaced apart from the coils, the radial tensioning screw is located above the coil assembly, and the two ends of the radial tensioning screw are connected to the partitions at both ends of the coil assembly.
6. The transformer elongated oval coil shaping device according to claim 5, characterized in that: Two limiting channel steels are disposed above the coil assembly, two limiting channel steels are disposed below the coil assembly, and the radial tensioning screw is disposed between the two limiting channel steels.
7. The transformer elongated oval coil shaping device according to claim 5, characterized in that: A support is provided between the limiting channel steel and the coil assembly.
8. The transformer elongated oval coil shaping device according to claim 5, characterized in that: The two limiting channel steels located on the same side of the coil assembly are connected by an axial tensioning screw.
9. The transformer elongated oval coil shaping device according to claim 5, characterized in that: When the clamping device is placed on the hydraulic device, the telescopic end of the hydraulic cylinder is at the same height as the center of the partition.
10. A transformer elongated oval coil shaping device according to claim 5, characterized in that, Its usage includes the following steps: S1: Temporarily clamp the wound coil using a clamping device; S2: Place the temporarily clamped coil onto the hydraulic device; S3: Press the coil to the design value in the short axis direction by applying pressure with a hydraulic cylinder, manually tighten the nut on the transverse tension screw, release the pressure from the hydraulic cylinder, and put the coil into the drying oven to cure and set.