Open-close type current transformer
The closely connected U-core closed-loop structure is formed through ultrasonic welding, which solves the problem of insufficient sealing and insulation of the open-closed current transformer, achieves better sealing and insulation, and reduces the risk of leakage.
Patent Information
- Application Number
- CN202422332521.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-24
AI Technical Summary
The existing open-closed current transformers have poor sealing and insulation when covered, which has a risk of leakage and affects the safety of use.
Ultrasonic welding is used to form a closed-loop structure that is closely connected in the first U-shaped iron core in the upper housing assembly and the second U-shaped iron core in the lower housing assembly, so as to achieve a close connection between the upper housing assembly and the lower housing assembly.
It improves the sealing and insulation of the open-closing current transformer, reduces the risk of leakage, and improves the safety of use.
Smart Images
Figure CN223230211U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of current transformers, in particular to a split-type current transformer. Background Art
[0002] A current transformer is an electronically-based current sensor that accurately measures current and outputs a corresponding electrical signal. It is widely used in power systems, industrial control, and power instrumentation. However, existing current transformers are typically closed-type. When using closed-type transformers to measure conductor current, the transformer must first be powered off and then re-energized after the conductor is inserted into the transformer to measure the conductor's current. While the aforementioned technical solution can measure the conductor's current, it requires powering off before inserting the conductor and then re-energizing it. This makes the closed-type transformer cumbersome for users to operate.
[0003] In order to solve the above technical problems, a split-type current transformer has appeared on the market. Although the split-type current transformer does not need to be powered off when installing the wires, it has the problem of insufficient sealing when the cover is closed. As a result, the sealing and insulation properties of the existing split-type current transformer are poor, and there is a risk of leakage. In severe cases, it may cause harm to the human body. Utility Model Content
[0004] In response to the shortcomings of the existing technology, the utility model provides a split-type current transformer. When the upper shell assembly and the lower shell assembly of the split-type current transformer are covered, ultrasonic welding is used to form a tightly connected closed-loop structure with the first U-shaped iron core in the upper shell assembly and the second U-shaped iron core in the lower shell assembly, thereby achieving a tight connection between the upper shell assembly and the lower shell assembly, so that the split-type current transformer has better sealing and insulation.
[0005] To achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:
[0006] A split-type current transformer comprises an upper shell assembly and a lower shell assembly, each of which is rotatably connected on one side and can be fixed by snapping on the other side. U-shaped grooves for adapting to the side walls of the conductor are correspondingly provided on the mating surfaces of the upper shell assembly and the lower shell assembly. A first U-shaped iron core is adapted in the upper shell assembly, and a second U-shaped iron core is adapted in the lower shell assembly. When the upper shell assembly and the lower shell assembly are closed, the first U-shaped iron core and the second U-shaped iron core are configured to be tightly connected together by ultrasonic welding to form a closed loop.
[0007] Furthermore, the upper shell assembly includes an upper shell body and an upper sealing plate, the lower shell assembly includes a lower shell body and a lower sealing plate, and the upper sealing plate and the lower sealing plate are configured to be sealed and connected to the upper shell body and the lower shell body respectively by ultrasonic welding.
[0008] Furthermore, the upper sealing plate and the lower sealing plate are configured to form abutting surfaces of the upper shell assembly and the lower shell assembly, respectively.
[0009] Furthermore, two ends of the first U-shaped iron core pass through the upper sealing plate of the upper shell assembly and are located on opposite sides of the U-shaped groove of the upper shell assembly, and the two ends of the first U-shaped iron core exposed to the outside through the upper sealing plate are first iron core welding parts for ultrasonic welding; two ends of the second U-shaped iron core pass through the lower sealing plate of the lower shell assembly and are located on opposite sides of the U-shaped groove of the lower shell assembly, and the two ends of the second U-shaped iron core exposed to the outside through the lower sealing plate are second iron core welding parts for ultrasonic welding; when the upper shell assembly and the lower shell assembly are covered, the two first iron core welding parts are configured to be able to be tightly connected with the two second iron core welding parts respectively through ultrasonic welding.
[0010] Furthermore, grooves are provided on the lower sealing plate and on opposite sides of the U-shaped groove of the lower shell assembly, and the two second core welding parts are respectively located in the two grooves, and the height of the second core welding parts is less than the depth of the grooves; when the upper shell assembly and the lower shell assembly are covered, the two first core welding parts will be respectively accommodated in the two grooves to contact the second core welding parts.
[0011] Furthermore, when the upper shell assembly and the lower shell assembly are covered, the height of the first core welding portion exceeds the end surface of the groove, so that a gap exists between the upper sealing plate and the lower sealing plate.
[0012] Furthermore, the cross-sectional size of the groove is larger than the cross-sectional size of the first core welding portion and the second core welding portion.
[0013] Furthermore, a protrusion is provided on the side surface of the lower shell body, and a buckle for fitting and engaging with the protrusion on the lower shell body is provided on the side surface of the upper shell body.
[0014] Furthermore, the upper shell assembly and the lower shell assembly are an integrated structure.
[0015] The above technical solution has the following advantages or beneficial effects:
[0016] In the split-type current transformer described in the utility model, when the upper and lower housing assemblies of the split-type current transformer are closed, ultrasonic welding is used to form a tightly connected closed-loop structure between the first U-shaped core in the upper housing assembly and the second U-shaped core in the lower housing assembly. This achieves a tight connection between the upper and lower housing assemblies, resulting in improved sealing and insulation performance for the split-type current transformer. This improves the poor sealing and insulation performance of existing split-type current transformers, which are prone to leakage. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural schematic diagram of a split-type current transformer according to an embodiment of the present utility model.
[0018] Figure 2 yes Figure 1 Schematic diagram of the structure from another perspective.
[0019] Figure 3 yes Figure 2 A partial enlarged view of point A in the figure.
[0020] Figure 4 It is a cross-sectional view of a split-type current transformer according to an embodiment of the present utility model.
[0021] Figure 5 yes Figure 4 A partial enlarged view of point B in FIG.
[0022] Description of labels:
[0023] 1. First U-shaped iron core, 2. Second U-shaped iron core, 3. Upper shell body, 4. Upper sealing plate, 5. Lower shell body, 6. Lower sealing plate, 7. Protrusion, 8. Buckle, 11. First iron core welding part, 21. Second iron core welding part, 61. Groove. DETAILED DESCRIPTION
[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0025] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.
[0026] Please refer to the attached Figure 1 To the attached Figure 5One embodiment of the present invention provides a split-type current transformer, comprising an upper shell assembly and a lower shell assembly, each of which is rotatably connected on one side and can be fixed by snapping on the other side. U-shaped grooves for adapting to the side walls of the conductor are correspondingly provided on the mating surfaces of the upper shell assembly and the lower shell assembly. A first U-shaped iron core 1 is adapted in the upper shell assembly, and a second U-shaped iron core 2 is adapted in the lower shell assembly. When the upper shell assembly and the lower shell assembly are covered, the first U-shaped iron core 1 and the second U-shaped iron core 2 are configured to be tightly connected together by ultrasonic welding to form a closed loop. It can be understood that in this embodiment, when the upper shell assembly and the lower shell assembly of the split-type current transformer are covered, the first U-shaped iron core 1 in the upper shell assembly and the second U-shaped iron core 2 in the lower shell assembly form a tightly connected closed loop structure by adopting ultrasonic welding, thereby achieving a tight connection between the upper shell assembly and the lower shell assembly, so that the split-type current transformer has better sealing and insulation properties.
[0027] Please refer to the attached Figure 1 To the attached Figure 5 In one preferred embodiment, the upper housing assembly includes an upper housing body 3 and an upper sealing plate 4, and the lower housing assembly includes a lower housing body 5 and a lower sealing plate 6. The upper sealing plate 4 and the lower sealing plate 6 are configured to be sealedly connected to the upper housing body 3 and the lower housing body 5, respectively, via ultrasonic welding, thereby isolating the components within the housing bodies from the outside world. Preferably, the upper sealing plate 4 and the lower sealing plate 6 are configured to form the mating surfaces of the upper and lower housing assemblies, respectively.
[0028] Please refer to the attached Figure 1 and attached Figure 4 In one preferred embodiment, the two ends of the first U-shaped core 1 pass through the upper sealing plate 4 of the upper shell assembly and are located on opposite sides of the U-shaped groove of the upper shell assembly, and the two ends of the first U-shaped core 1 exposed to the outside through the upper sealing plate 4 are first core welding parts 11 for ultrasonic welding; the two ends of the second U-shaped core 2 pass through the lower sealing plate 6 of the lower shell assembly and are located on opposite sides of the U-shaped groove of the lower shell assembly, and the two ends of the second U-shaped core 2 exposed to the outside through the lower sealing plate 6 are second core welding parts 21 for ultrasonic welding; when the upper shell assembly and the lower shell assembly are covered, the two first core welding parts 11 are configured to be tightly connected to the two second core welding parts 21 respectively through ultrasonic welding. It can be understood that in this embodiment, the U-shaped core is directly used as the welding part for ultrasonic welding, so that when the upper shell assembly and the lower shell assembly are covered, not only can the performance of the open-close current transformer of the present invention be guaranteed, but also welding materials are saved, thereby reducing production costs.
[0029] Please refer to the attached Figure 2 To the attached Figure 5In one preferred embodiment, grooves 61 are provided on the lower sealing plate 6 and on opposite sides of the U-shaped groove of the lower shell assembly. The two second core welding parts 21 are respectively located in the two grooves 61, and the height of the second core welding parts 21 is less than the depth of the grooves 61. When the upper shell assembly and the lower shell assembly are covered, the two first core welding parts 11 are configured to be respectively accommodated in the two grooves 61 to contact the second core welding parts 21. In this way, after the first core welding parts 11 and the second core welding parts 21 are ultrasonically welded, the upper shell assembly and the lower shell assembly can be tightly covered and connected together. However, those skilled in the art should understand that in other embodiments, the grooves can also be provided on the upper sealing plate 4, and are not limited to the specific implementation methods disclosed in this embodiment.
[0030] Please refer to the attached Figure 2 To the attached Figure 5 In one preferred embodiment, when the upper shell assembly and the lower shell assembly are covered, the height of the first core welding portion 11 exceeds the end surface of the groove 61, so that there is a gap between the upper sealing plate 4 and the lower sealing plate 6, preventing ultrasonic welding from causing damage to the upper shell assembly and the lower shell assembly when welding the first core welding portion 11 and the second core welding portion 21. It can be understood that in this embodiment, when the upper shell assembly and the lower shell assembly are covered, the height of the first core welding part 11 will exceed the end face of the groove 61. At this time, there is a gap between the upper sealing plate 4 and the lower sealing plate 6; ultrasonic welding is then used to melt the surfaces of the first core welding part 11 and the second core welding part 21 to achieve a tight connection. At this time, since the surfaces of the first core welding part 11 and the second core welding part 21 will melt, the first core welding part 11 will continue to move inward into the groove 61, thereby causing the spacing of the gap between the upper sealing plate 4 and the lower sealing plate 6 to continue to decrease. When the upper sealing plate 4 and the lower sealing plate 6 are just in contact, the ultrasonic welding is stopped. In this way, the open and close current transformer of the utility model not only has a good sealing and insulation effect, but also prevents damage to the shell assembly during welding.
[0031] Please refer to the attached Figure 4 and attached Figure 5 In one preferred embodiment, the cross-sectional size of the groove 61 is larger than the cross-sectional size of the first core welding part 11 and the second core welding part 21, so as to accommodate the melted parts of the first core welding part 11 and the second core welding part 21 during ultrasonic welding.
[0032] Please refer to the attached Figure 1 and attached Figure 2In one preferred embodiment, a protrusion 7 is provided on the side of the lower shell body 5, and a buckle 8 is provided on the side of the upper shell body 3 for adapting and snapping with the protrusion 7 on the lower shell body 5. The adaption and snapping of the protrusion 7 and the buckle 8 can realize the snap connection and fixation of the lower shell assembly and the upper shell assembly.
[0033] Please refer to the attached Figure 1 and attached Figure 2 The upper shell assembly and the lower shell assembly are an integrated structure. However, those skilled in the art should understand that in other embodiments, the upper shell assembly and the lower shell assembly can also be other structures and are not limited to the specific implementation methods disclosed in this embodiment.
[0034] The following is the installation process of this utility model:
[0035] Please refer to the attached Figure 1 To the attached Figure 5 When it is necessary to measure the current of the wire, the wire must first be clamped in the U-shaped groove of the lower shell assembly, then the upper shell assembly and the lower shell assembly are closed, and the buckle 8 on the upper shell assembly is clamped with the protrusion 7 on the lower shell assembly. Finally, the first iron core welding part 11 and the second iron core welding part 21 are tightly welded together by ultrasonic welding. When the upper sealing plate 4 and the lower sealing plate 6 are just in place, the ultrasonic welding is stopped immediately, achieving a tight connection between the upper shell assembly and the lower shell assembly, thereby making the split-type current transformer have better sealing and insulation.
[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention 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. These modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present invention.
Claims
1. A split-type current transformer, characterized in that: The invention comprises an upper shell component and a lower shell component, one side of which is rotatably connected and the other side of which is capable of being fixed by clamping. U-shaped grooves for matching with the side walls of the wires are correspondingly provided on the mating surfaces of the upper shell component and the lower shell component. A first U-shaped iron core (1) is fitted in the upper shell component, and a second U-shaped iron core (2) is fitted in the lower shell component. When the upper shell component and the lower shell component are covered, the first U-shaped iron core (1) and the second U-shaped iron core (2) are configured to be tightly connected together by ultrasonic welding to form a closed loop.
2. The split-type current transformer according to claim 1, characterized in that: The upper shell assembly includes an upper shell body (3) and an upper sealing plate (4), and the lower shell assembly includes a lower shell body (5) and a lower sealing plate (6), and the upper sealing plate (4) and the lower sealing plate (6) are configured to be sealed and connected to the upper shell body (3) and the lower shell body (5) respectively through ultrasonic welding.
3. The split-type current transformer according to claim 2, characterized in that: The upper sealing plate (4) and the lower sealing plate (6) are configured to form the butt joint surfaces of the upper shell assembly and the lower shell assembly, respectively.
4. The split-type current transformer according to claim 3, characterized in that: Two ends of the first U-shaped iron core (1) pass through the upper sealing plate (4) of the upper shell assembly and are located on opposite sides of the U-shaped groove of the upper shell assembly, and the two ends of the first U-shaped iron core (1) exposed to the outside through the upper sealing plate (4) are first iron core welding parts (11) for ultrasonic welding; two ends of the second U-shaped iron core (2) pass through the lower sealing plate (6) of the lower shell assembly and are located on opposite sides of the U-shaped groove of the lower shell assembly, and the two ends of the second U-shaped iron core (2) exposed to the outside through the lower sealing plate (6) are second iron core welding parts (21) for ultrasonic welding; when the upper shell assembly and the lower shell assembly are covered, the two first iron core welding parts (11) are configured to be tightly connected to the two second iron core welding parts (21) respectively through ultrasonic welding.
5. The split-type current transformer according to claim 4, characterized in that: Grooves (61) are provided on the lower sealing plate (6) and on opposite sides of the U-shaped groove of the lower shell assembly. The two second core welding portions (21) are respectively located in the two grooves (61), and the height of the second core welding portions (21) is less than the depth of the grooves (61). When the upper shell assembly and the lower shell assembly are covered, the two first core welding portions (11) are respectively accommodated in the two grooves (61) to contact the second core welding portions (21).
6. The split-type current transformer according to claim 5, characterized in that: When the upper shell assembly and the lower shell assembly are covered, the height of the first core welding portion (11) exceeds the end surface of the groove (61), so that a gap exists between the upper sealing plate (4) and the lower sealing plate (6).
7. The split-type current transformer according to claim 6, characterized in that: The cross-sectional dimensions of the groove (61) are larger than the cross-sectional dimensions of the first iron core welding portion (11) and the second iron core welding portion (21).
8. The split-type current transformer according to any one of claims 2 to 7, characterized in that: A protrusion (7) is provided on the side surface of the lower shell body (5), and a buckle (8) for fitting and snapping with the protrusion (7) on the lower shell body (5) is provided on the side surface of the upper shell body (3).
9. The split-type current transformer according to claim 1, characterized in that: The upper shell assembly and the lower shell assembly are an integrated structure.