Support for fixing current coil

Abstract

The utility model relates to the technical field of mutual inductors, in particular to a support for fixing a current coil, the support is arranged in a casting body mold, a primary winding and a secondary winding are arranged in the casting body mold, the secondary winding is wound on the primary winding, and the secondary winding is wound on the secondary winding. The support comprises a hoisting piece, a hoisting nut, a support body and an embedded nut, the support body comprises a cross beam, longitudinal beams arranged at the two ends of the cross beam and a stand column vertically connected with the longitudinal beams, and the top end of the stand column is fixed to the top of the pouring body mold through the embedded nut; the cross beam is provided with a groove for the hoisting piece to penetrate through and is fixed through the hoisting nut, and the bottom of the hoisting piece is connected with the secondary winding. The support is high in stability, grooving on a mold is avoided, and the installation reliability of the mutual inductor is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of current transformers, and particularly relates to a bracket for fixing a current coil. Background Art

[0002] A current transformer generally consists of an iron core, coils and a coil skeleton. The coils usually include a plurality of primary coils and secondary coils, and are preformed by winding around the coil skeleton.

[0003] When installing the 35kV current coil into the mold, the coil is fixed by nut hoisting, that is, a fixing piece is placed on the iron core during coil production, a nut is welded on the fixing piece, and when installing the mold, a screw is screwed into the nut for hoisting and fixing. Therefore, a slot needs to be opened at the position where the coil is hoisted above the mold to ensure that the coil can be hoisted. This hoisting method brings a problem that after the mold installation is completed, the hoisting slot needs to be sealed well, otherwise the casting mixture will leak out during the casting process, wasting materials and affecting the appearance and performance of the product. When demolding with this hoisting method, all the coil fixing screws need to be removed to take out the transformer body, wasting a lot of labor.

[0004] The document with the patent number ZL202121925154.3 discloses a hoisting bracket for a current transformer coil, including a main body of the hoisting bracket for the current transformer coil. The size of the main body of the hoisting bracket for the current transformer coil is the same as the size of the installation insert of the transformer bottom plate. Slots matching with the anti-pulling slots of the transformer bottom plate are opened on the four sides of the main body of the hoisting bracket for the current transformer coil, and the slots are used to prevent loosening. A bottom support is installed at the middle position of the top of the main body of the hoisting bracket for the current transformer coil. The cross-section of the bottom support is in a predetermined shape, and the bottom support is used to fix the secondary coil of the current transformer. This hoisting bracket is only applicable to small current transformers. When the coil is large and the number of secondary winding coils is large, it is difficult to lift the coil to the insert position for slot fixing during mold installation with this hoisting method, and the stability of the bracket is lacking. Summary of the Utility Model

[0005] To solve the above problems, the utility model provides a bracket for fixing a current coil, in which the hoisting structure is arranged inside the casting body mold. There is no need to open a slot above the mold, and there is no need to seal the hoisting slot after mold installation, and there will be no leakage of materials during the casting process, and the stability of the bracket is high.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a bracket for fixing the current coil, the bracket is arranged inside the casting body mold, the casting body mold is provided with a primary winding and a secondary winding, the secondary winding is wound on the primary winding, the bracket includes a hanging piece, a hanging nut, a bracket body and an embedded nut, the bracket body includes a crossbeam, a longitudinal beam arranged at both ends of the crossbeam and a column vertically connected to the longitudinal beam, the top of the column is fixed to the top of the casting body mold by the embedded nut, the crossbeam is provided with a strip groove, the strip groove is for the hanging piece to pass through and be fixed by the hanging nut, and the bottom of the hanging piece is connected to the secondary winding.

[0007] Furthermore, the hanging member is a hanging screw.

[0008] Furthermore, the embedded nut and the column are welded into one body.

[0009] Furthermore, a grounding wire is fixed on the hanging piece, one end of which is connected to a U-shaped open terminal. After the U-shaped open terminal is clamped on the hanging piece, the hanging nut is screwed onto the hanging piece to fix the U-shaped open terminal between the hanging nut and the beam.

[0010] Furthermore, the bottom of the primary winding is fixed to the bottom of the casting body mold.

[0011] Furthermore, the columns are connected to the ends of the longitudinal beams, there are two longitudinal beams, and there are four columns, and the positions of the four columns are symmetrical about the center of the cross beam.

[0012] Furthermore, a plurality of the hanging parts are provided and are evenly arranged along the axial direction of the secondary winding.

[0013] Furthermore, the bottom of the primary winding is fixed to the bottom of the casting body mold via a connecting fixture, and the fixture is a wiring block on the primary winding.

[0014] The technical solution of this utility model has the following advantages:

[0015] 1. The utility model avoids the need to make grooves on the mold for the hanging parts to pass through by arranging the hanging winding brackets inside the casting mold, which prevents leakage on the surface of the casting mold during casting and improves the sealing of the casting mold. The surface of the casting mold is smoother and flatter, which reduces the work of subsequent grinding. All hanging structures are also cast inside the coil, and demoulding does not require the removal of hanging parts, which reduces labor and improves work efficiency.

[0016] 2. The hoisting member of the present utility model adopts a hoisting screw. Through the cooperation of the hoisting screw and the hoisting nut, the hoisting height of the secondary winding coil can be adjusted, and the up and down position of the coil can be adjusted to avoid installation errors. At the same time, the same bracket structure can be used for the installation of coils of different sizes, which not only meets the fixation of the coils of small current transformers, but also saves the cost of reconstructing the bracket.

[0017] 3. The bracket of the present utility model provides a suitable fixing method for the grounding wire. The grounding wire does not need to be wound around the hoisting screw. The grounding wire is fixed by connecting one end of the grounding wire to a U-shaped open terminal and fixing the U-shaped open terminal between the hoisting nut and the cross beam. The surface of the grounding wire is smooth and free of burrs, and at the same time, the reliability of grounding is ensured, and there is no risk of grounding falling off.

[0018] It should be understood that all combinations of the foregoing concepts and additional concepts described in more detail below can be regarded as part of the inventive subject matter of the present disclosure as long as such concepts do not conflict with each other.

[0019] The foregoing and other aspects, embodiments and features of the teachings of the present utility model can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present utility model, such as the features and / or beneficial effects of exemplary embodiments, will be apparent in the following description, or will be learned through the practice of specific embodiments according to the teachings of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are not drawn to scale with respect to actual reference objects. In the drawings, each identical or approximately identical component shown in each figure may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present utility model will be described by way of example and with reference to the drawings, wherein:

[0021] Figure 1 is a schematic diagram of the overall structure of the bracket for fixing the current coil and the winding of the present utility model.

[0022] Figure 2 is a top view of the bracket for fixing the current coil of the present utility model.

[0023] Figure 3 is a front view of the bracket for fixing the current coil of the present utility model.

[0024] Figure 4 is a schematic diagram of the structure of the U-shaped open terminal in the present utility model.

[0025] Explanation of reference numerals in the drawings:

[0026] 1 - Insert nut; 2 - Column; 3 - Cross beam; 4 - Casting body mold; 5 - Primary winding; 6 - Secondary winding; 7 - Lifting piece; 8 - Grounding wire; 9 - Lifting nut; 10 - Strip groove; 11 - Longitudinal beam; 12 - U-shaped open wiring terminal. Detailed implementation mode

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which the present utility model belongs.

[0028] The "first", "second" and similar terms used in the specification and claims of the patent application of the present utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "a", "an" or "the" and similar terms do not indicate a limitation in quantity, but indicate the existence of at least one. The terms such as "comprising" or "including" are intended to mean that the elements or objects appearing before "comprising" or "including" cover the features, wholes, steps, operations, elements and / or components listed after "comprising" or "including", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations. The terms such as "upper", "lower", "left" and "right" are only used to indicate the relative position relationship. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0029] When the 35kV current coil is fixed during mold installation, the coil is fixed by nut hoisting, that is, during coil production, a fixing piece is placed on the iron core, and a nut is welded on the fixing piece. During mold installation, a screw is screwed into the nut for hoisting and fixing. Therefore, a slot needs to be opened at the position for hoisting the coil above the mold to ensure that the coil can be hoisted. This hoisting method brings a problem that after the mold installation is completed, the hoisting slot needs to be sealed well, otherwise the casting mixture will leak out during the casting process, wasting materials and also affecting the appearance and performance of the product. When demolding with this hoisting method, all the fixing screws of the coil need to be removed to take out the transformer body, wasting a lot of labor.

[0030] The document with the patent number ZL202121925154.3 discloses a hoisting bracket for a current transformer coil, which includes a main body of the hoisting bracket for the current transformer coil. The size of the main body of the hoisting bracket for the current transformer coil is the same as the size of the installation insert on the transformer bottom plate. Slots are provided around the main body of the hoisting bracket for the current transformer coil and are matched with the anti-pulling slots on the transformer bottom plate. The slots are used to prevent loosening. A bottom support is installed at the middle position of the top of the main body of the hoisting bracket for the current transformer coil. The cross-section of the bottom support is in a predetermined shape, and the bottom support is used to fix the secondary coil of the current transformer. This hoisting bracket is only applicable to small current transformers. When the coil is large and the number of secondary winding coils is large, it is difficult to lift the coil to the insert position for slot fixing when using this hoisting method for mold installation, and the stability of the bracket is lacking.

[0031] Moreover, for a hoisting bracket for a current transformer coil disclosed in the document with the patent number ZL202121925154.3, the bracket and the coil are integrated into one. When the coil is fixed to the bottom support, it cannot be ensured that the position of the coil is exactly the same each time. If there is a deviation in the left and right dimensions when the coil is fixed to the bottom support, the positions of the coil and the bracket cannot be adjusted left and right during mold installation, and the accuracy of the casting layer cannot be guaranteed. At the same time, the parameters of the current transformer are constantly changing, and the core size used in the design will also change continuously. The position of the bracket in this patent is fixed and cannot be adjusted, so the up and down position of the coil cannot be adjusted, and the accuracy of the up and down casting layers cannot be guaranteed either.

[0032] Based on the above problems, the embodiment of the present invention provides a bracket for fixing a current coil, which has high stability, does not require mold opening on the mold, and can adjust the installation height of the coil by adjusting the bracket.

[0033] Please refer to Figure 1 As shown, the embodiment of the present invention provides a bracket for fixing a current coil. The bracket is arranged inside a casting body mold 4. A primary winding 5 and a secondary winding 6 are arranged in the casting body mold 4. The secondary winding 6 is wound around the primary winding 5. The bracket includes a hoisting member 7, a hoisting nut 9, a bracket main body, and an embedded nut 1. The bracket main body includes a cross beam 3, longitudinal beams 11 arranged at both ends of the cross beam 3, and columns 2 vertically connecting the longitudinal beams 11. The top of the column 2 is fixed to the top of the casting body mold 4 through the embedded nut 1. A strip-shaped slot 10 is opened on the cross beam 3. The strip-shaped slot 10 allows the hoisting member 7 to pass through and is fixed by the hoisting nut 9. The bottom of the hoisting member 7 is connected to the secondary winding 6.

[0034] In the present utility model, the supports for hoisting the windings are all arranged inside the casting mold 4, avoiding the need to slot the mold for the hoisting member 7 to pass through, thus preventing the problem of leakage of the casting material on the surface of the casting mold 4 during casting and improving the sealing performance of the casting mold 4. The surface of the casting mold 4 is smoother and flatter, reducing the subsequent grinding work. All the hoisting structures are also cast inside the coil, and the hoisting member 7 does not need to be removed during demolding, reducing labor and improving work efficiency.

[0035] The shape and structure of the strip-shaped groove 10 ensure that the groove has a certain length and can pass through multiple hoisting members 7 simultaneously, meeting the hoisting requirements of coils with different numbers of turns.

[0036] In some embodiments of the present utility model, the hoisting member 7 is a hoisting screw. By cooperating the hoisting screw with the hoisting nut 9, the hoisting height of the secondary winding 6 coil can be adjusted, the up and down position of the coil can be adjusted to avoid installation errors, and the same support structure can be used for the installation of coils of different sizes, not only meeting the coil fixation of small current transformers but also saving the cost of remanufacturing the support.

[0037] In some embodiments of the present utility model, the embedded nut 1 and the column 2 are welded into one body. By welding the embedded nut 1 and the column 2 into one body in the embodiment of the present utility model, the firmness is improved, the contact surface with the cast resin is increased, the tensile force is enhanced, and the stability of the current transformer during side installation is improved.

[0038] In some embodiments of the present utility model, a grounding wire 8 is further fixed on the hoisting member 7. One end of the grounding wire 8 is connected to a U-shaped open wiring terminal 12. After the U-shaped open wiring terminal 12 clamps the hoisting member 7, the hoisting nut 9 is screwed onto the hoisting member 7 to fix the U-shaped open wiring terminal 12 between the hoisting nut 9 and the cross beam 3. In traditional current transformers, since the slot is opened on the casting mold 4 and there is no suitable structure inside the casting mold 4 for fixing the grounding wire 8, the grounding wire 8 is directly wound around the embedded nut, and there is a risk of the grounding wire 8 falling off. After the grounding wire 8 falls off, the grounding wire contacts the primary winding, causing a primary breakdown of the product and the entire current transformer to be scrapped. Moreover, winding the grounding wire 8 around the embedded nut will also produce burrs on the surface of the grounding wire 8, affecting the partial discharge level of the product. After improving the support in the embodiment of the present utility model, the grounding wire 8 does not need to be wound around the embedded nut. The grounding wire 8 is fixed by connecting one end of the grounding wire 8 to the U-shaped open wiring terminal 12 and fixing the U-shaped open wiring terminal 12 between the hoisting nut 9 and the cross beam 3. The surface of the grounding wire 8 is smooth without burrs, and at the same time, the reliability of grounding is ensured, and there is no risk of grounding falling off.

[0039] In some embodiments of the present utility model, the bottom of the primary winding 5 is fixed to the bottom of the casting mold 4, further fixing the primary winding 5 and the secondary winding 6 to ensure that the primary winding 5 and the secondary winding 6 do not displace within the casting mold 4.

[0040] In some embodiments of the present utility model, the column 2 is connected to the end of the longitudinal beam 11. The number of the longitudinal beams 11 is two, and the number of the columns 2 is four. The positions of the four columns 2 are symmetric about the center of the cross beam 3, ensuring reliable hoisting and more stable fixation of the coil of the secondary winding 6.

[0041] In some embodiments of the present utility model, a plurality of hoisting members 7 are provided and arranged uniformly along the axial direction of the secondary winding 6, so that the cross beam 3 is evenly stressed and the hoisting is more firm.

[0042] In some embodiments of the present utility model, the bottom of the primary winding 5 is fixed to the bottom of the casting mold 4 through a connecting and fixing member, and the fixing member is a wiring block on the primary winding.

[0043] In summary, the present utility model can not only overcome the adverse effects such as casting leakage and non-smooth mold surface caused by slotting in the traditional current transformer mold, but also adapt to the hoisting and fixation of coils of different sizes, which is economical and practical and conducive to popularization.

[0044] Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Those with ordinary knowledge in the technical field to which the present utility model belongs can make various changes and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to that defined by the claims.

Claims

1. A bracket for fixing a current coil, characterized in that: The bracket is arranged inside the casting body mold, and a primary winding and a secondary winding are arranged in the casting body mold. The secondary winding is wound on the primary winding. The bracket includes a hanging piece, a hanging nut, a bracket body and an embedded nut. The bracket body includes a crossbeam, a longitudinal beam arranged at both ends of the crossbeam and a column vertically connected to the longitudinal beam. The top of the column is fixed to the top of the casting body mold by the embedded nut. A strip groove is provided on the crossbeam, and the strip groove is used for the hanging piece to pass through and be fixed by the hanging nut. The bottom of the hanging piece is connected to the secondary winding.

2. The bracket for fixing the current coil according to claim 1, characterized in that: The hanging parts are hanging screws.

3. The bracket for fixing a current coil according to claim 1, characterized in that: The embedded nut and the column are welded into one body.

4. The bracket for fixing a current coil according to claim 1, characterized in that: A grounding wire is also fixed on the hanging piece, one end of which is connected to a U-shaped open terminal. After the U-shaped open terminal is clamped on the hanging piece, the hanging nut is screwed onto the hanging piece to fix the U-shaped open terminal between the hanging nut and the crossbeam.

5. The bracket for fixing a current coil according to claim 1, characterized in that: The bottom of the primary winding is fixed to the bottom of the casting body mold.

6. The bracket for fixing a current coil according to claim 1, characterized in that: The columns are connected to the ends of the longitudinal beams. There are two longitudinal beams and four columns. The positions of the four columns are symmetrical about the center of the cross beam.

7. The bracket for fixing a current coil according to claim 1, characterized in that: There are a plurality of hanging parts, which are evenly arranged along the axial direction of the secondary winding.

8. The bracket for fixing a current coil according to claim 5, characterized in that: The bottom of the primary winding is fixed to the bottom of the casting body mold by a connecting fixture, and the fixture is a wiring block on the primary winding.

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