Process for die-filling and independent positioning of upper part and lower part of open-close type current transformer

Abstract

The invention discloses a die-filling independent positioning process for upper and lower parts of an open-close type current transformer, and relates to the technical field of current transformer manufacturing. Comprising the following steps: placing a square magnet in a groove of a bottom cover plate of a pouring mold, and fixing a fixed insert on the bottom cover plate of the pouring mold; the front mold of the pouring mold and the bottom cover plate of the pouring mold are assembled together; fixing the clamp inserts of the open-close type current transformer with the front mold and the rear mold of the pouring mold respectively; putting the body of the open-close type current transformer into a front mold of a pouring mold, wherein the body is aligned with the square magnet up and down; the pouring mold rear mold, the pouring mold bottom cover plate and the pouring mold front mold are fixed together; and the lower part of the open-close type current transformer is molded and independently positioned in the same manner as the upper part. The upper and lower parts are independently positioned, so that the operation is more flexible and simple, and the operation difficulty and labor intensity are reduced; error accumulation caused by simultaneous positioning is reduced through an independent positioning mode, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of current transformer manufacturing, and in particular to a process for independently positioning upper and lower parts of a split-type current transformer. Background Art

[0002] In the manufacturing process of split-type current transformers, mold positioning is one of the key links. In the past, the common mold installation method was to position the upper and lower parts at the same time, but this approach was accompanied by many challenges, including limited positioning accuracy, cumbersome operating procedures, and easy deviations. These problems significantly hindered the improvement of product quality and the optimization of production efficiency. More importantly, due to the lack of production accuracy, traditional split-type current transformers can no longer meet the growing needs of the current power system, and have become a key problem that needs to be overcome in the upgrading and sustainable development of the power system. Summary of the invention

[0003] The purpose of the present invention is to provide a process for independently positioning the upper and lower parts of a split-type current transformer, so as to solve the problems of transformer body damage, transformer leakage after casting, complicated procedures, low pass rate, long production period, etc. that are easily generated during the mold positioning of the existing split-type current transformer.

[0004] To achieve the above purpose, the technical solution of the present application is: a process for independently positioning the upper and lower parts of a split-type current transformer, including:

[0005] Step 1: Cut the circular iron core into two semi-circular iron cores, and grind the cut edges of the iron cores to make their end faces smooth and flat;

[0006] Step 2: Insulate and wrap the semi-annular iron core and wind the copper wire to form the body of the split-type current transformer;

[0007] Step 3: Place a square magnet in the groove of the bottom cover of the casting mold, and use the first hexagonal bolt to fix the fixed insert of the lower part of the split current transformer to the bottom cover of the casting mold;

[0008] Step 4: Assemble the front mold of the casting mold and the bottom cover plate of the casting mold together;

[0009] Step 5: Use the second hexagonal bolt to fix the clamp insert of the split current transformer to the front mold of the casting mold and the back mold of the casting mold respectively;

[0010] Step 6: Place the body of the split-type current transformer into the front mold of the casting mold, align the body with the square magnet up and down, fix the body of the split-type current transformer by the square magnet, and then adjust the body to leave a gap between it and the clamp insert and the fixed insert to ensure that the coil of the body and the clamp insert are insulated from the ground;

[0011] Step 7: Use the third hexagonal bolt to fix the back mold of the casting mold, the bottom cover plate of the casting mold, and the front mold of the casting mold together;

[0012] The above is a method for independently positioning the lower part of the split-type current transformer. The method for independently positioning the upper part of the mold is the same as the method for independently positioning the lower part of the mold.

[0013] In one embodiment, the body of the current transformer is centered in the inner cavities of the front mold and the back mold of the casting mold by means of the fixing insert at the top and the clamping inserts at both sides.

[0014] In one embodiment, in the first step, the annular core of the split-type current transformer is rolled with a Permalloy alloy having high magnetic permeability and stable performance and then subjected to a glue spraying treatment.

[0015] In one of the embodiments, the bottom cover plate of the casting mold is provided with two grooves, a square magnet is placed in each groove, and the square magnet is aligned with the end surface of the semi-circular body of the split-type current transformer up and down for fixation.

[0016] In one of the embodiments, first through holes are formed around the bottom cover of the casting mold, and first hexagonal bolts are passed through the corresponding first through holes to fix the fixing inserts of the upper and lower parts of the split-type current transformer on the bottom cover of the casting mold.

[0017] In one of the embodiments, the front mold and the back mold of the casting mold are respectively provided with second through holes, and second hexagonal bolts are passed through the corresponding second through holes to fix the clamp insert of the open-close current transformer on the front mold and the back mold of the casting mold respectively.

[0018] In one of the embodiments, a third through hole is further provided on the periphery of the front mold of the casting mold and the rear mold of the casting mold, and a third hexagonal head bolt passes through the third through hole to fix the front mold of the casting mold and the rear mold of the casting mold.

[0019] In one of the embodiments, the front mold and the back mold of the casting mold are both provided with outer edges extending outwards.

[0020] In one of the embodiments, a third through hole is opened on the outer edge of the front mold of the casting mold and the rear mold of the casting mold.

[0021] In one embodiment, third through holes are opened on both sides of the bottom cover plate of the casting mold, and third hexagonal head bolts pass through the third through holes of the bottom cover plate of the casting mold and the third through holes on the outer edge to fix the bottom cover plate of the casting mold, the front mold of the casting mold, and the back mold of the casting mold.

[0022] The present invention adopts the above technical solution, and can achieve the following technical effects:

[0023] 1) Due to the independent positioning of the upper and lower parts, the operation is more flexible and simple, reducing the difficulty and labor intensity of operation; the independent positioning method reduces the error accumulation caused by simultaneous positioning, improves production efficiency, and the transformer produced has high precision to meet the growing requirements of the power system.

[0024] 2) The present invention adopts a process of independently positioning the upper and lower parts of the transformer body, replacing the traditional top screw positioning method. It is not only easier to operate, but also saves multiple processes such as removing the top screw, adding materials and repairing the appearance after pouring, thereby improving production efficiency while ensuring the appearance quality of the product.

[0025] 3) The present invention uses a square magnet to position the transformer coil body, ensuring that the insulation distance of the body in the mold is uniform. The strong magnetic force can prevent the transformer body from tilting and shaking, making the transformer body more stable, thereby ensuring the performance stability of the transformer and significantly improving the product qualification rate.

[0026] 4) During the production process, the present invention uses a Permalloy rolled core with high magnetic permeability and stable performance, so that the measurement accuracy of the produced product can reach 0.5 level, ensuring the accuracy of product measurement under wide load conditions.

[0027] 5) By setting a fixed insert on the top and equipping the two sides with clamp inserts, the coil can be more intuitively ensured to be centered during the molding process, thereby improving the accuracy and efficiency of assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a front view of the mold assembly mold for the split-type current transformer of the present invention;

[0030] Figure 2 This is a schematic diagram of the internal structure of the mold assembly die for the split-type current transformer of the present invention;

[0031] Figure 3 It is a side view of the mold assembly die of the split-type current transformer of the present invention and a schematic diagram of part of the internal structure;

[0032] Figure 4 This is a top view of the mold assembly mold for the open and close type current transformer of the present invention.

[0033] In the figure: 1 is the bottom cover plate of the casting mold; 2 is the front mold of the casting mold; 3 is the body of the split current transformer; 4 is the square magnet; 5 is the clamp insert; 6 is the second hexagonal bolt; 7 is the third hexagonal bolt; 8 is the back mold of the casting mold; 9 is the first hexagonal bolt; 10 is the fixed insert; 11 is the first through hole; 12 is the groove; 13 is the second through hole; 14 is the third through hole; 15 is the iron core. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0037] In the description of the present application, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position 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 specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] See also Figure 1-4 This embodiment provides a process for independently positioning the upper and lower parts of a split-type current transformer, including the following steps:

[0040] The first step is to roll the annular core 15 of the split-type current transformer with high magnetic permeability and stable performance Permalloy and perform glue spraying, and then cut the annular core into two semi-annular cores, and the core cutouts are required to be finely ground to make the end faces of the core smooth and flat;

[0041] Step 2: Insulate and wrap the semi-annular iron core and wind the copper wire to form the body 3 of the split current transformer;

[0042] Step 3: Place the square magnets 4 in the two grooves of the bottom cover plate 1 of the casting mold, open the first through holes 11 around the bottom cover plate 1 of the casting mold, use the first hexagonal bolts 9 to pass through the corresponding first through holes 11, and fix the fixing insert 10 of the lower part of the split current transformer on the bottom cover plate 1 of the casting mold;

[0043] Step 4: Assemble the casting mold front mold 2 and the casting mold bottom cover plate 1 together;

[0044] Step 5: The front mold 2 of the casting mold and the back mold 8 of the casting mold are respectively provided with second through holes 13, and the second hexagonal bolts 6 are passed through the corresponding second through holes 13 to fix the clamp insert 5 of the split current transformer on the front mold 2 of the casting mold and the back mold 8 of the casting mold respectively;

[0045] Step 6: Place the body 3 of the split-type current transformer into the front mold 2 of the casting mold, align the body 3 with the square magnet 4 up and down, fix the body 3 of the split-type current transformer by the square magnet 4, and then adjust the body 3 to leave a gap between it and the clamp insert 5 and the fixing insert 10 to ensure that the coil of the body and the clamp insert are insulated from the ground;

[0046] Step 7: A third through hole is also opened on the outer periphery of the front mold 2 and the back mold 8 of the casting mold, and the third hexagonal bolt 7 passes through the third through hole to fix the front mold 2 and the back mold 8 of the casting mold; in addition, a third through hole is opened on the outer edge of the front mold 2 and the back mold 8 of the casting mold, and third through holes are opened on both sides of the bottom cover plate 1 of the casting mold. The third hexagonal bolt 7 passes through the third through hole of the bottom cover plate 1 of the casting mold and the third through hole on the outer edge to fix the bottom cover plate 1 of the casting mold, the front mold 2 of the casting mold, and the back mold 8 of the casting mold.

[0047] The above is a method for independently positioning the lower part of the split-type current transformer. The method for independently positioning the upper part of the mold is the same as the method for independently positioning the lower part of the mold.

[0048] The present invention realizes the positioning of the body of the split-type zero-sequence current transformer by using a square magnet instead of a traditional top screw. The operation is simple and eliminates a series of processes such as removing the top screw after casting, supplementing materials, repairing the appearance, etc., thereby ensuring production efficiency while also ensuring the appearance of the product. The mold positioning accuracy of the upper and lower parts of the split-type current transformer is improved, thereby significantly improving product quality. Since the upper and lower parts are positioned independently, the operation is more flexible and simple, and the operating difficulty and labor intensity are reduced; the independent positioning method reduces the error accumulation caused by simultaneous positioning, improves production efficiency, and the transformers produced are of high precision to meet the growing requirements of the power system.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A process for independently positioning the upper and lower parts of a split-type current transformer, characterized in that: include: The first step is to cut the circular iron core (15) into two semi-circular iron cores, and grind the cut edges of the iron cores to make their end faces smooth and flat; Step 2: Insulate and wrap the semi-annular iron core and wind the copper wire to form the body of the split-type current transformer (3); Step 3: Place a square magnet (4) in the groove of the bottom cover plate (1) of the casting mold, and use a first hexagonal bolt (9) to fix the fixing insert (10) of the lower part of the split-type current transformer to the bottom cover plate (1) of the casting mold; Step 4: Assemble the casting mold front mold (2) and the casting mold bottom cover plate (1) together; Step 5: Use the second hexagonal bolt (6) to fix the clamp insert (5) of the split-type current transformer to the front mold (2) and the back mold (8) of the casting mold respectively; Step 6: Place the body (3) of the split-type current transformer into the front mold (2) of the casting mold, align the body (3) with the square magnet (4) up and down, fix the body (3) of the split-type current transformer by the square magnet (4), and then adjust the body (3) to leave a gap between it and the clamp insert (5) and the fixing insert (10) to ensure that the coil of the body and the clamp insert are insulated from the ground; Step 7: Use the third hexagonal bolt (7) to fix the casting mold rear mold (8) with the casting mold bottom cover (1) and the casting mold front mold (2); The above is a method for independently positioning the lower part of the split-type current transformer. The method for independently positioning the upper part of the mold is the same as the method for independently positioning the lower part of the mold.

2. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1 is characterized in that: The body (3) of the current transformer is centered in the inner cavities of the front mold (2) and the back mold (8) of the casting mold by means of the fixing insert (10) on the top and the clamp inserts (5) on both sides.

3. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1 is characterized in that: In the first step, a circular ring-shaped iron core (15) of a split-type current transformer is rolled with a Permalloy alloy having high magnetic permeability and stable performance and then subjected to a glue spraying treatment.

4. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1 is characterized in that: The bottom cover plate (1) of the casting mold is provided with two grooves (12), each of which contains a square magnet, which is aligned with the end surface of the semi-circular body of the split-type current transformer in the vertical direction for fixation.

5. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1, characterized in that: The bottom cover plate (1) of the casting mold is provided with first through holes (11) on all sides, and first hexagonal bolts (9) are passed through the corresponding first through holes (11) to fix the fixing inserts (10) of the upper and lower parts of the split-type current transformer on the bottom cover plate (1) of the casting mold.

6. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1, characterized in that: The front mold (2) and the back mold (8) of the casting mold are respectively provided with second through holes (13), and second hexagonal bolts (6) are passed through the corresponding second through holes (13) to fix the clamp insert (5) of the split-type current transformer on the front mold (2) and the back mold (8) of the casting mold.

7. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1, characterized in that: The outer peripheries of the front mold (2) and the back mold (8) of the casting mold are also provided with a third through hole, and a third hexagonal bolt (7) passes through the third through hole to fix the front mold (2) and the back mold (8) of the casting mold.

8. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 1, characterized in that: The front mold (2) and the rear mold (8) of the casting mold are both provided with outer edges extending outwards.

9. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 8, characterized in that: A third through hole is formed on the outer edges of the front mold (2) and the rear mold (8) of the casting mold.

10. The process for independently positioning the upper and lower parts of the split-type current transformer according to claim 9, characterized in that: The casting mold bottom cover plate (1) has third through holes on both sides, and third hexagonal head bolts (7) pass through the third through holes of the casting mold bottom cover plate (1) and the third through holes on the outer edge to fix the casting mold bottom cover plate (1), the casting mold front mold (2), and the casting mold back mold (8).

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