Modular structure of electronic transformer

Abstract

The utility model provides an electronic mutual inductor modularization structure which comprises a mutual inductor shell and a cover plate arranged above the mutual inductor shell in a covering mode, a limiting cavity is formed in the mutual inductor shell, a plurality of containing cavities used for containing magnetic cores are formed in the mutual inductor shell, the limiting cavity is located in the containing cavities, and the magnetic cores are arranged in the containing cavities. The magnetic core is arranged outside the limiting cavity in a sleeving mode, a partition plate is arranged between every two adjacent containing cavities, the lower end face of the cover plate is further provided with wrapping plates wrapping the two sides of the partition plate, avoiding grooves allowing the partition plates to be embedded are formed in the wrapping plates, and the wrapping plates are arranged between every two adjacent protruding ribs. The modular structure of the electronic mutual inductor can overcome the defect that in the prior art, a magnetic core is prone to shaking in the using process, and consequently internal magnetic flux changes instably.

Description

Technical Field

[0001] The utility model relates to the technical field of instrument transformers, and particularly relates to a modular structure of an electronic instrument transformer. Background Art

[0002] A circuit breaker is internally provided with an instrument transformer for monitoring the current of each phase. When the current fluctuates, the instrument transformer transmits a signal to the inside of the circuit breaker to provide a trigger basis for the operation of the circuit breaker.

[0003] In the utility model patent with the publication number of CN111190099A, a monitoring module and a fusion circuit breaker are disclosed. The metering instrument transformer includes 3 magnetic cores, but there are relatively large gaps outside the magnetic cores, resulting in easy shaking of the magnetic cores during use, unstable induced magnetic fields, and thus affecting the magnetic field measurement accuracy. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect that the magnetic core is prone to shaking during use in the prior art, resulting in unstable magnetic flux inside the magnetic core and affecting the magnetic field measurement accuracy, so as to provide a modular structure of an electronic instrument transformer capable of fixing the magnetic core.

[0005] To this end, the utility model provides a modular structure of an electronic instrument transformer, which includes an instrument transformer housing and a cover plate covering the upper part of the instrument transformer housing. The instrument transformer housing is provided with a limiting cavity. Inside the instrument transformer housing, there are several accommodating cavities for accommodating the magnetic cores. The limiting cavity is located inside the accommodating cavities, and the magnetic core is sleeved outside the limiting cavity. A partition plate is arranged between adjacent accommodating cavities. The lower end surface of the cover plate is further provided with wrapping plates covering both sides of the partition plate. An avoidance groove for the partition plate to be embedded is arranged inside the wrapping plates. The wrapping plates are arranged between two adjacent rib strips.

[0006] Further: The cover plate is provided with rib strips inserted towards one end of the magnetic core.

[0007] Further: Extension blocks for positioning the magnetic core are arranged on the side walls of the accommodating cavities.

[0008] Further: A buckling structure is arranged between the instrument transformer housing and the cover plate. The buckling structure includes a buckling block arranged on one of the cover plate or the instrument transformer housing and a buckling groove arranged on the other and adapted to the buckling block.

[0009] Further: The buckling block is arranged on the cover plate, the buckling groove is arranged on the instrument transformer housing, and the buckling block is provided with barbs.

[0010] Further: The mutual inductor module is arranged inside the circuit breaker. The circuit breaker includes a circuit breaker housing. A nut is arranged inside the mutual inductor housing, and a screw adapted to the nut is connected to the circuit breaker housing.

[0011] Further: A transfer board and a receiving groove for receiving the transfer board are arranged on the mutual inductor housing. A card slot for the transfer board to be snapped into is opened on the side wall of the receiving groove.

[0012] Further: A transfer board and a circuit board are arranged above the mutual inductor module. A wire groove for the wires on the transfer board to be inserted and connected to the magnetic core is arranged on the mutual inductor housing.

[0013] Further: A gas blocking rib for preventing gas from entering the circuit board is also arranged on the mutual inductor housing.

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

[0015] 1. For the modular structure of the electronic mutual inductor provided by the present utility model, the limiting cavity on the mutual inductor housing is used to limit the lateral or longitudinal movement of the magnetic core. However, due to the differences in the sizes of different magnetic cores, the magnetic core is installed outside the limiting cavity, and the magnetic core and the limiting cavity cannot be fully adapted, resulting in gaps and shaking between the limiting cavity and the magnetic core. The three magnetic cores inside the mutual inductor housing are separated by partition plates, so as to avoid mutual influence between the magnetic cores. Partition plates are added between any two adjacent magnetic cores, and wrapping plates covering both sides of the partition plates are added on the cover plate. Through the setting of the wrapping plates, the creepage distance between the two magnetic cores is increased, the safety of the product is improved, and the wrapping plates can fill the gaps between the two magnetic cores, so as to cooperate with the limiting cavity to clamp the magnetic core on both sides and fix the position of the magnetic core to avoid shaking of the magnetic core.

[0016] 2. For the modular structure of the electronic mutual inductor provided by the present utility model, when the cover plate is covered on the mutual inductor housing, the convex rib will abut against the upper end face of the magnetic core to realize the preliminary positioning of the magnetic core. Through the setting of the convex rib, the moving space of the magnetic core can be reduced, and finally glue is poured into the mutual inductor housing to perform secondary positioning on the magnetic core. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic cross-sectional structure diagram of the circuit breaker;

[0019] Figure 2 It is a schematic structural diagram inside the mutual inductor module;

[0020] Figure 3 It is a schematic structural diagram of the cover plate;

[0021] Figure 4 It is a schematic cross-sectional view inside the mutual inductor module;

[0022] Figure 5 It is another schematic cross-sectional view inside the mutual inductor module;

[0023] Figure 6 It is a side view inside the mutual inductor module.

[0024] Explanation of reference numerals:

[0025] 1. Mutual inductor housing; 10. Limiting cavity; 11. Accommodating cavity; 12. Extension block; 13. Nut; 2. Cover plate; 21. Rib; 22. Wrapping plate; 23. Avoidance groove; 3. Magnetic core; 4. Partition plate; 5. Buckling structure; 51. Buckling block; 52. Buckling groove; 6. Circuit breaker housing; 61. Screw; 7. Accommodating groove; 8. Card slot; 9. Adapter plate; 91. Cable management groove; 92. Air baffle rib; 93. Insert block; 94. Limiting groove. Detailed implementation manners

[0026] Next, the technical solutions of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] Embodiment

[0031] This embodiment provides a modular structure of an electronic current transformer, including a transformer housing 1 and a cover plate 2 covering the upper part of the transformer housing 1. A plurality of accommodating cavities 11 for accommodating magnetic cores 3 are arranged inside the transformer housing 1. A partition plate 4 is arranged between adjacent accommodating cavities 11. A wrapping plate 22 covering both sides of the partition plate 4 is further arranged on the lower end surface of the cover plate 2. An avoidance groove 23 for the partition plate 4 to be inserted into is arranged inside the wrapping plate 22. The wrapping plate 22 is arranged between two adjacent ribs 21.

[0032] The above specific improvement is as follows: As Figures 1-4 shown, the limiting cavity 10 on the transformer housing 1 is used to limit the lateral or longitudinal movement of the magnetic core 3. However, due to the differences in the sizes of different magnetic cores 3, when installed outside the limiting cavity 10, the magnetic core 3 and the limiting cavity 10 cannot be fully adapted, resulting in a gap between the limiting cavity 10 and the magnetic core 3, and the magnetic core 3 will shake. The three magnetic cores 3 inside the transformer housing 1 are separated by partition plates 4 from each other, so as to avoid the mutual influence between the magnetic cores 3. A partition plate 4 is added between any two adjacent magnetic cores 3, and a wrapping plate 22 covering both sides of the partition plate 4 is added on the cover plate 2. Through the arrangement of the wrapping plate 22, the creepage distance between the two magnetic cores 3 is increased, the safety of the product is improved, and the wrapping plate 22 can fill the gap between the two magnetic cores 3, so as to cooperate with the limiting cavity 10 to clamp the magnetic core 3 left and right and fix the position of the magnetic core 3 to avoid the magnetic core 3 from shaking.

[0033] Based on the above embodiment: Ribs 21 inserted towards one end of the magnetic core 3 are arranged on the cover plate 2.

[0034] The above specific improvement is as follows: When the cover plate 2 is covered on the transformer housing 1, the rib 21 will abut against the upper end surface of the magnetic core 3 to realize the preliminary positioning of the magnetic core 3. Through the arrangement of the rib 21, the movement space of the magnetic core 3 can be reduced. Finally, glue is poured into the transformer housing 1 to perform secondary positioning on the magnetic core 3.

[0035] Based on the above embodiments: An extension block 12 for positioning the magnetic core 3 is provided on the side wall of the accommodation cavity 11.

[0036] The above specific improvement is as follows: As Figure 1 and Figure 2 shown, an extension block 12 is provided in the accommodation cavity 11. The extension block 12 is used to fill the space in the accommodation cavity 11. The extension block 12 cooperates with the limiting cavity 10 to abut against the magnetic core 3 so as to fix the position of the magnetic core 3. After the position of the magnetic core 3 is fixed, the cover plate 2 is then covered on the mutual inductor housing 1, thereby preventing the magnetic core 3 from moving or falling out.

[0037] Based on the above embodiments: A snap-fit structure 5 is provided between the mutual inductor housing 1 and the cover plate 2. The snap-fit structure 5 includes a snap-fit block 51 provided on one of the cover plate 2 or the mutual inductor housing 1 and a snap-fit groove 52 provided on the other party and adapted to the snap-fit block 51.

[0038] Based on the above embodiments: The snap-fit block 51 is provided on the cover plate 2, the snap-fit groove 52 is provided on the mutual inductor housing 1, and an inverted hook is provided on the snap-fit block 51.

[0039] The above specific improvement is as follows: As Figure 5 and Figure 6 shown, the cooperation of the snap-fit block 51 and the snap-fit groove 52 is adopted between the mutual inductor housing 1 and the cover plate 2 to replace the screw fixation in the prior art, and the cover plate 2 and the mutual inductor housing 1 can be quickly connected.

[0040] Based on the above embodiments: The mutual inductor module is arranged in a circuit breaker. The circuit breaker includes a circuit breaker housing 6. A nut 13 is arranged inside the mutual inductor housing 1, and a screw 61 adapted to the nut 13 is connected to the circuit breaker housing 6.

[0041] The above specific improvement is as follows: As Figure 1 shown, a nut 13 is provided on the mutual inductor housing 1. The mutual inductor housing 1 and the circuit breaker housing 6 are connected by the screw 61 and the nut 13. Specifically, an extension part can be provided outside the mutual inductor housing 1, and a accommodation space for accommodating an insert nut is opened inside it. When assembling the mutual inductor housing 1 and the circuit breaker housing 6, the machine screw is screwed into the insert nut to fix the mutual inductor housing 1 and the circuit breaker housing. As an alternative implementation, a accommodation space for a nut can be provided at the bottom of the mutual inductor housing 1. When assembling the mutual inductor housing 1 and the circuit breaker housing 6, the screw is screwed into the nut to fix the mutual inductor housing 1 and the circuit breaker housing.

[0042] Based on the above embodiments: A transfer board 9 and a receiving groove 7 for receiving the transfer board 9 are provided on the current transformer housing 1, and a card slot 8 for the transfer board 9 to be snapped into is provided on the side wall of the receiving groove 7.

[0043] The above specific improvement is as follows: As Figure 1 and Figure 2 shown, in order to fix the transfer board 9 above the current transformer housing 1, a receiving groove 7 is opened above the current transformer housing 1 for the transfer board 9 to be snapped into, so as to fix the position of the transfer board 9. There is a plug 93 on the transfer board 9 for plugging into the controller module above the transfer board 9, and a limiting groove 94 adapted to the plug 93 is provided on the side wall of the current transformer housing 1. After the transfer board 9 is inserted from the card slot 8, the plug 93 will abut against the limiting groove 94. Finally, the cover plate 2 is covered on the current transformer housing 1, and the cover plate 2 and the limiting groove 94 clamp the transfer board 9 from both sides, so as to position the transfer board 9.

[0044] Based on the above embodiments: A transfer board 9 and a circuit board are provided above the current transformer module, and a wire arranging groove 91 for the wires on the transfer board 9 to be inserted and connected to the magnetic core 3 is provided on the current transformer housing 1.

[0045] The above specific improvement is as follows: The wires on the circuit board are transferred through the transfer board 9, and then enter the current transformer housing 1 through the wire arranging groove 91 to be connected to the magnetic core 3. There is a gap of 1.1 mm between the magnetic core 3 and the side wall of the current transformer housing 1 for accommodating the wires (the diameter of the wires is 0.8 mm). Through the setting of this gap, it can prevent the cover plate 2 from pressing the wires, thus affecting power transmission.

[0046] Based on the above embodiments: A gas blocking rib 92 for preventing gas from entering the circuit board is further provided on the current transformer housing 1.

[0047] The above specific improvement is as follows: There is a contact mechanism in the circuit breaker. When the contact mechanism is opened, a strong air flow will be generated, and these air flows carry metal particles. To prevent the metal particles from entering the circuit board and causing a short circuit of the circuit board, a gas blocking rib 92 for preventing gas from entering the circuit board is provided on the current transformer housing 1.

[0048] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. An electronic current transformer modular structure, characterized in that: It includes an instrument transformer housing (1) and a cover plate (2) covering the upper part of the instrument transformer housing (1). A limiting cavity (10) is formed in the instrument transformer housing (1). A plurality of accommodating cavities (11) for accommodating a magnetic core (3) are arranged inside the instrument transformer housing (1). The limiting cavity (10) is located inside the accommodating cavity (11), and the magnetic core (3) is sleeved outside the limiting cavity (10). A partition plate (4) is arranged between adjacent accommodating cavities (11). A wrapping plate (22) wrapping both sides of the partition plate (4) is further arranged on the lower end surface of the cover plate (2). An avoidance groove (23) for the partition plate (4) to be embedded is arranged inside the wrapping plate (22). The wrapping plate (22) is arranged between two adjacent ribbed protrusions (21).

2. The modular structure of an electronic current transformer according to claim 1, characterized in that: The cover plate (2) is provided with ribbed protrusions (21) inserted towards one end of the magnetic core (3).

3. The modular structure of an electronic current transformer according to claim 2, wherein: An extension block (12) for positioning the magnetic core (3) is arranged on the side wall of the accommodating cavity (11).

4. An electronic current transformer modular structure according to any one of claims 1-3, characterized in that: A buckling structure (5) is arranged between the instrument transformer housing (1) and the cover plate (2). The buckling structure (5) includes a buckling block (51) arranged on one side of the cover plate (2) or the instrument transformer housing (1) and a buckling groove (52) arranged on the other side and adapted to the buckling block (51).

5. An electronic current transformer modular structure according to claim 4, characterized in that: The buckling block (51) is arranged on the cover plate (2), the buckling groove (52) is arranged on the instrument transformer housing (1), and barbs are arranged on the buckling block (51).

6. An electronic current transformer modular structure according to any one of claims 1-3, characterized in that: The instrument transformer module is arranged inside a circuit breaker. The circuit breaker includes a circuit breaker housing (6). A nut (13) is arranged inside the instrument transformer housing (1). A screw (61) adapted to the nut (13) is connected to the circuit breaker housing (6).

7. An electronic current transformer modular structure according to any one of claims 1-3, characterized in that: A transition board (9) and a receiving groove (7) for receiving the transition board (9) are arranged on the instrument transformer housing (1). A card slot (8) for the transition board (9) to be snapped into is formed on the side wall of the receiving groove (7).

8. A modular structure of an electronic current transformer according to any one of claims 1-3, characterized in that: A transition board (9) and a circuit board are arranged above the instrument transformer module. A wire arranging groove (91) for the wire on the transition board (9) to be inserted and connected to the magnetic core (3) is arranged on the instrument transformer housing (1).

9. A modular structure of an electronic current transformer according to any one of claims 1-3, characterized in that: A gas blocking rib (92) for preventing gas from entering the circuit board is further arranged on the instrument transformer housing (1).

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