A core assembly and a transformer

Abstract

The utility model discloses a kind of iron core assembly and mutual inductor. Iron core assembly includes: two oppositely arranged iron core bodies, each iron core body includes a plurality of protrusions in the extension direction along length, form a plug-in slot between each adjacent two protrusions, the plug-in slot of one iron core body is used for the protrusion of another iron core body insertion, to make two iron core bodies plug-in form annular structure. Two iron core bodies in the iron core assembly in the utility model, annular structure is formed by the way of plug-in, since the area of overlap after plug-in connection, thereby increase the contact area of two, so that magnetic circuit can be in stable closed state, can form reliable loop.

Description

Technical Field

[0001] This utility model belongs to the field of current transformer technology, specifically relating to an iron core assembly and a current transformer. Background Technology

[0002] A current transformer is a device that proportionally transforms voltage or current, converting high voltage or large current into standard low voltage or standard small current to enable the use of measuring instruments, protection devices, and automatic control equipment. In a switchable current transformer, the two iron cores are joined together by a plane, which can easily lead to poor magnetic circuit closure. Utility Model Content

[0003] The purpose of this invention is to disclose a core assembly to solve the technical problem in the prior art where the core assembly has planar contact, resulting in poor magnetic circuit closure.

[0004] To achieve the above objectives, one aspect of this utility model discloses a core assembly, comprising:

[0005] Two iron cores are arranged opposite each other. Each end of each iron core includes a plurality of protrusions along its length. A insertion slot is formed between each pair of adjacent protrusions. The insertion slot of one iron core is used for the protrusion of the other iron core to be inserted, so that the two iron cores are inserted to form a ring structure.

[0006] As an optional implementation, the length of the protrusion ranges from 6mm to 15mm along the extension direction of the core body.

[0007] As an alternative implementation, the thickness of the free end of the protrusion gradually decreases along the thickness direction of the iron core.

[0008] As an optional implementation, the protrusion has a variable diameter section with gradually decreasing thickness and a constant diameter section with constant thickness. Along the extension direction of the length of the iron core, the length of the variable diameter section is 1 / 5 to 1 / 3 of the length of the constant diameter section.

[0009] As an optional implementation, the bottom wall of the insertion slot is provided with a mating groove for the protrusion to be inserted.

[0010] As an optional implementation, the core body is composed of multiple substrates, with the same end of each pair of adjacent substrates having different lengths, arranged in an alternating manner to form the protrusions and the insertion slots.

[0011] As an optional implementation, the substrate is a silicon steel sheet or a permalloy sheet.

[0012] As an alternative implementation, the core body includes a main body and a plurality of protrusions located at each end of the main body.

[0013] As an optional implementation, the end faces of the plurality of protrusions are flush with each other, and the bottom walls of the plurality of insertion slots are flush with each other.

[0014] Another aspect of this utility model discloses a current transformer, including the aforementioned iron core assembly.

[0015] Compared with the prior art, the advantages of the iron core assembly and current transformer of this utility model are as follows:

[0016] The iron core assembly of this invention, by setting a protrusion and a plug-in groove at one end of each iron core body, allows two iron core bodies to form a ring structure through plug-in connection. Since the two bodies have overlapping areas after plug-in connection, the contact area between them is increased, so that the magnetic circuit can be in a stable closed state and a reliable loop can be formed. At the same time, by reducing the air gap and seam, the magnetic reluctance is significantly reduced, allowing the magnetic flux to flow more concentratedly along the path of the iron core body, while reducing magnetic field leakage and interference to surrounding circuits, which can effectively improve the service life and accuracy when applied to current transformers. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the core assembly according to an embodiment of the present utility model;

[0019] Figure 2 yes Figure 1 An exploded view of the iron core assembly;

[0020] Figure 3 This is an exploded view of the iron core body according to an embodiment of the present invention;

[0021] Figure 4 yes Figure 2 The front view of the iron core.

[0022] Explanation of key figure labels:

[0023] 100-Core assembly, 10-Core body, 11-Protrusion, 111-Sloping surface, 112-Variable diameter section, 113-Equal diameter section, 12-Intercepting groove, 13-Base plate, 131-Intermediate section, 132-First intercepting section, 133-Second intercepting section, 17-Main body. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0026] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0027] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0028] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0029] The technical solution of this utility model will be further described below with reference to the embodiments and accompanying drawings.

[0030] Please see Figures 1 to 4 This application provides a core assembly 100, which includes two opposing core bodies 10.

[0031] Please refer to Figure 1 and Figure 2 Each iron core 10 includes a plurality of protrusions 11 at each end along its length extension direction, and a insertion slot 12 is formed between each pair of adjacent protrusions 11. The insertion slot 12 of one iron core 10 is used for the protrusions 11 of another iron core 10 to be inserted, so that the two iron cores 10 are inserted to form a ring structure.

[0032] The aforementioned iron core assembly 100, by providing a protrusion 11 and a insertion slot 12 at one end of each iron core body 10, enables two iron core bodies 10 to form a ring structure through insertion. Since the two have overlapping areas after insertion, the contact area between them is increased, allowing the magnetic circuit to be in a stable closed state and forming a reliable loop. At the same time, by reducing the air gap and seam, the magnetic resistance is significantly reduced, allowing the magnetic flux to flow more concentratedly along the path of the iron core body 10, while reducing magnetic field leakage and interference to surrounding circuits, effectively improving the service life and accuracy when applied to current transformers.

[0033] In this embodiment, the iron core 10 is roughly C-shaped, and the two iron cores 10 are connected to form a closed ring structure.

[0034] When forming each iron core 10, please refer to [the relevant documentation / reference]. Figure 3 Each core body 10 can be composed of multiple sheet-like substrates 13, meaning each core body 10 is composed of multiple substrates 13 connected together. The lengths of the same end of any two adjacent substrates 13 are different, and they are staggered to form protrusions 11 and insertion slots 12. Each substrate 13 includes a middle section 131 and a first insertion section 132 and a second insertion section 133 located at both ends of the middle section 131. The extension length of the first insertion section 132 is less than the extension length of the second insertion section 133. When multiple substrates 13 are stacked, one... The shorter first insertion segment 132 of the substrate 13 and the longer second insertion segment 133 of the adjacent substrate 13 are stacked together. Multiple substrates 13 are stacked in sequence so that the longer second insertion segment 133 is used as a protrusion 11 relative to the shorter protruding length. The end faces of two adjacent second insertion segments 133 and the first insertion segment 132 located between them form an insertion groove 12. When the two iron cores 10 are inserted, the second insertion segment 133 of one iron core 10 is inserted into the insertion groove 12 of the other iron core 10, thereby realizing the installation of the two.

[0035] In this embodiment, the substrate 13 can be a silicon steel sheet or a permalloy sheet, and is not limited thereto. When forming the iron core 10, the substrate 13 can be formed by stamping, riveting, or injection molding. It can be understood that after the two iron cores 10 are assembled into a whole, not only are the end faces of the protrusions 11 and the end faces of the insertion slots 12 in contact, but the surfaces of the protrusions 11 of the two iron cores 10 are also in contact with each other. That is, the surfaces of the second insertion section 133 of one iron core 10 and the second insertion section 133 of the other iron core 10 are in contact with each other to achieve closed conduction of the magnetic circuit.

[0036] Please see Figure 4 Along the extension direction of the length of the iron core 10, the length L of the protrusion 11 in this embodiment ranges from 6mm to 15mm, that is, the length L of the second insertion segment 133 that is longer than the first insertion segment 132 ranges from 6mm to 15mm. By setting this length, the two iron cores 10 have a certain overlapping area when they are inserted, which ensures the stable closure of the magnetic circuit; at the same time, it ensures that the length of the protrusion of the second insertion segment 133 is not too long, so as not to affect the structural strength of the protrusion 11.

[0037] In some embodiments, the length L of the protrusion 11 can be set to a value such as 6mm, 7mm, 8mm, 9mm, 12mm or 15mm, and is not limited here.

[0038] In addition, please see Figure 3 and Figure 4 To facilitate the interlocking of the two iron cores 10, the thickness of the free end of the protrusion 11 gradually decreases along the thickness direction of the iron core 10. That is, the two opposite sides of the free end of the protrusion 11 have inclined surfaces 111. The inclined surfaces 111 have a guiding function. The free end with reduced thickness facilitates the interlocking of the two iron cores 10 and improves the smoothness of the interlocking. At the same time, the thickness of the free end gradually decreases to avoid collision and friction between the two iron cores 10 during interlocking.

[0039] Please refer to Figure 4When the portion with the inclined surface 111 is set, the protrusion 11 has a variable diameter section 112 with gradually decreasing thickness and a constant diameter section 113 with constant thickness. Along the extension direction of the length of the iron core 10, the length L1 of the variable diameter section 112 is 1 / 5 to 1 / 3 of the length L2 of the constant diameter section 113. By setting this ratio, the constant diameter section 113 has a certain length, while the length of the variable diameter section 112 is not too long and affects the overall structural strength. If the variable diameter section 112 is set too long, the protrusion 11 may break when the two iron cores 10 are inserted. At the same time, after the insertion is achieved, the surfaces of the constant diameter sections 113 of the two iron cores 10 need to be in contact with each other. If the length of the constant diameter section 113 is set too small, it will affect the magnetic circuit closure between the two iron cores 10.

[0040] Furthermore, in order to achieve the positioning of the two iron cores 10 during insertion, a mating groove can be provided on the bottom wall of the insertion slot 12. The mating groove is used for the protrusion 11 to be inserted. That is, a mating groove is provided at the end of the first insertion section 132, and the second insertion section 133 of the other iron core 10 is inserted into the mating groove, which enables the quick positioning and installation of the two iron cores 10 during insertion.

[0041] Please see Figure 2 In another embodiment, when forming the core body 10, the core body 10 may include a main body 17 and a plurality of protrusions 11 at each end of the main body 17. That is, when forming the protrusions 11, a portion of the material is cut off from both ends of a whole raw material. After the material is cut off, the insertion groove 12 is formed, and the protrusions 11 are formed corresponding to the positions of the insertion grooves 12. This method facilitates the rapid forming of the entire core body 10.

[0042] Furthermore, whether the core body 10 is formed by molding the substrate 13 or by cutting raw materials to form the protrusions 11 and the insertion grooves 12, in this embodiment, the end faces of the multiple protrusions 11 are flush with each other, and the bottom walls of the multiple insertion grooves 12 are flush with each other, thereby ensuring the consistency of the appearance of each core body 10 and facilitating the molding of each core body 10.

[0043] The aforementioned iron core assembly 100, by setting each iron core body 10 to have a protrusion 11 and a plug-in groove 12 at its end, allows two iron core bodies 10 to be combined to form a ring structure by plugging in. Since there is a certain overlap area between the two, a stable closed magnetic circuit can be achieved, which further improves the measurement accuracy of the current transformer when applied to the current transformer.

[0044] In another embodiment of the present invention, a current transformer is also provided, the current transformer including a housing and the aforementioned iron core assembly 100.

[0045] The iron core assembly 100 is located inside the outer casing.

[0046] The aforementioned current transformer has a protrusion 11 and a slot 12 at the end of each iron core 10. The two are combined to form a ring structure by plugging them together. The two have a certain overlapping area, which enables a stable closed magnetic circuit and makes the current transformer have higher measurement accuracy.

[0047] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A core assembly, characterized in that, include: Two iron cores are arranged opposite each other. Each end of each iron core includes a plurality of protrusions along its length. A insertion slot is formed between each pair of adjacent protrusions. The insertion slot of one iron core is used for the protrusion of the other iron core to be inserted, so that the two iron cores are inserted to form a ring structure.

2. The core assembly according to claim 1, characterized in that, Along the length of the iron core, the length of the protrusion ranges from 6mm to 15mm.

3. The core assembly according to claim 1 or 2, characterized in that, Along the thickness direction of the iron core, the thickness of the free end of the protrusion gradually decreases.

4. The core assembly according to claim 3, characterized in that, The protrusion has a variable diameter section with gradually decreasing thickness and a constant diameter section with constant thickness. Along the extension direction of the length of the iron core, the length of the variable diameter section is 1 / 5 to 1 / 3 of the length of the constant diameter section.

5. The core assembly according to claim 3, characterized in that, The bottom wall of the insertion slot is provided with a mating groove, which is used for the protrusion to be inserted.

6. The core assembly according to claim 1 or 2, characterized in that, The iron core is composed of multiple substrates, with the same end of each pair of adjacent substrates having different lengths, arranged in an alternating manner to form the protrusions and the insertion slots.

7. The core assembly according to claim 6, characterized in that, The substrate is a silicon steel sheet or a permalloy sheet.

8. The core assembly according to claim 1 or 2, characterized in that, The core body includes a main body and a plurality of protrusions located at each end of the main body.

9. The core assembly according to claim 1 or 2, characterized in that, The end faces of the plurality of protrusions are flush with each other, and the bottom walls of the plurality of insertion slots are flush with each other.

10. A current transformer, characterized in that, Includes the core assembly as described in any one of claims 1-9.

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