Current transformer

Abstract

The utility model discloses a current transformer which comprises a first shell and a second shell, a first iron core is arranged in the first shell, a second iron core is arranged in the second shell, a wire passing groove is formed in the first shell, a first column body and a second column body are arranged on the two sides of the wire passing groove, a sliding hole is formed in the first column body, and a sliding groove is formed in the second column body. The second shell is slidably connected into the sliding hole and can be connected between the first column body and the second column body, so that the first iron core in the first shell and the second iron core in the second shell define a closed iron core. The sliding hole is formed in the first column body of the first shell, and the second shell is slidably connected into the sliding hole, so that sliding connection is formed between the first shell and the second shell, and the first iron core and the second iron core in the first shell and the second shell can form a closed iron core, a cable can be conveniently installed in the cable passing groove and locked, and the cable passing groove can be conveniently used in a narrow space.

Description

Technical Field

[0001] The present application relates to the technical field of current detection equipment, and in particular to a current transformer. Background Art

[0002] A current transformer is a device that measures current in a cable based on the battery induction principle and consists of a closed iron core and windings.

[0003] The current transformers in the prior art are structurally classified into open-type current transformers and clamp-type current transformers. The open-type current transformer includes an upper shell and a lower shell that are hingedly connected. A wire hole is provided between the upper and lower shells. The upper and lower shells are opened and closed by rotating along the hinge axis. However, the upper shell is difficult to open due to obstacles when the cable to be tested is located in a narrow space, and installation is inconvenient. The two shells of the clamp-type current transformer are also hingedly connected, and a pressing handle is required, which makes the overall volume of the AC transformer larger. During installation, it is necessary to press the handle to open the two shells to both sides, which takes up a large space and cannot be used in narrow cable ducts.

[0004] Therefore, it is necessary to design a current transformer that is easy to install and has a wide range of applications. Utility Model Content

[0005] The present application aims to solve one of the technical problems in the related art to a certain extent. To this end, the present application provides a current transformer that is easy to install and convenient to use in a narrow space.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical solution: a current transformer, including a first shell and a second shell, a first iron core is provided in the first shell, and a second iron core is provided in the second shell, the first shell includes a first column and a second column arranged at intervals, the interval between the first column and the second column forms a wire groove, a sliding hole is provided on the first column, the second shell is slidably connected in the sliding hole and can be connected between the first column and the second column, so that the first iron core in the first shell and the second iron core in the second shell form a closed iron core.

[0007] In the present technical solution, a first iron core is arranged in the first shell, a second iron core is arranged in the second shell, and a wire groove is formed between the first column and the second column of the first shell. A sliding hole is arranged on the first column and the second shell is slid in the sliding hole to realize the opening and closing of the wire groove of the first shell by the second shell. When the second shell is connected between the first column and the second column, the first iron core and the second iron core form a closed iron core, and the wire groove is located in the closed iron core, so that when the cable is installed in the wire groove, the cable is located inside the closed iron core, and the current transformer can detect the circuit flowing through the cable. By arranging the first shell and the second shell as a sliding connection, the opening and closing process of the wire groove is simplified, and the current transformer can be easily used in a narrow space by adjusting the movement direction of the first shell.

[0008] Preferably, the second column is provided with an insertion hole, which is arranged opposite to the sliding hole. The second shell includes a first end and a second end. When the second shell slides toward the second column in the sliding hole, the first end of the second shell can be inserted into the insertion hole.

[0009] Preferably, the first shell and the first iron core are both set to be U-shaped, the second shell is set to be a long strip, the second shell is slidably connected to the slot of the wire groove, the second iron core is set to be bar-shaped or U-shaped, and can form a ring-shaped closed iron core with the first iron core.

[0010] Preferably, protrusions bent in the same direction are formed on both side ends of the second iron core, and the end faces of the protrusions pass through the first shell or are flush with the outer surface of the first shell. The end faces of the protrusions are formed into planes, and the two end faces of the first iron core are also formed into planes. When the first end of the second shell is inserted into the insertion hole, the end faces of the protrusions on both sides of the second iron core are tightly fitted with the two end faces of the first iron core respectively.

[0011] Preferably, the height of the protruding portion of the second core is set to 1-5 mm.

[0012] Preferably, a protrusion is provided at the bottom of the first end of the second shell, and when the first end of the second iron core is inserted into the insertion hole 131, the protrusion lifts the first end of the second shell upward.

[0013] Preferably, an elastic member is provided between the inner top surface of the first column and the second column and the second iron core, and when the first iron core and the second iron core form a closed iron core, the elastic member presses the second iron core downward.

[0014] Preferably, the core shell is configured to be U-shaped to match the first core, and end portions are provided at both ends of the core shell. The end portions are tightly connected and clamped inside the first shell, and the core shell is tightly wrapped around the outside of the first core so that the first core is clamped inside the first shell.

[0015] Preferably, a plurality of elastic members for supporting the core shell are provided between the bottom of the core shell and the inner bottom surface of the first shell.

[0016] Preferably, a push plate for pushing and pulling the second shell to slide in the sliding hole is provided on the second end of the second shell, and the push plate can fit with the first column when the first end of the second shell is inserted into the insertion hole.

[0017] Preferably, a positioning hole is provided on the push plate, and a positioning protrusion cooperating with the positioning hole is correspondingly provided on the surface of the first column. When the push plate is in contact with the first column, the positioning protrusion is inserted into the positioning hole.

[0018] Preferably, a limiting block is provided on the second shell for preventing the second shell from escaping from the sliding hole of the first shell.

[0019] Preferably, the limit block is configured as an elastic pressure block, and an elastic member is provided at the bottom of the limit block. When the elastic member is in a compressed state, the limit block can be retracted inside the second shell so that the second shell can be removed from the sliding hole.

[0020] Preferably, an iron core shell is tightly fitted on the first iron core, and a winding is wound on the outer circumference of the iron core shell.

[0021] Preferably, the first column and the second column of the first shell are arranged in parallel, and the second shell is arranged perpendicular to the first column and the second column.

[0022] Preferably, the second shell includes a buckle cover and a base, the buckle cover and the base are snap-connected to form an installation chamber, the second iron core is arranged in the installation chamber, and a through hole is provided on the bottom surface of the base, the second iron core can pass through the through hole and form a closed iron core with the first iron core.

[0023] These features and advantages of this application will be disclosed in detail in the following detailed description and accompanying drawings. The best embodiments or means of this application will be fully illustrated in conjunction with the accompanying drawings, but this does not limit the technical solutions of this application. Furthermore, although there may be multiple features, elements, and components in each of the following text and accompanying drawings, different symbols or numbers may be used for convenience, but all represent components with the same or similar structure or function. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present application will be further described below with reference to the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the three-dimensional structure of an AC transformer according to an embodiment of the present application (with the wire slot opening open);

[0026] Figure 2 This is a schematic diagram of another three-dimensional structure of an AC transformer according to an embodiment of the present application (with the wire slot opening closed);

[0027] Figure 3 for Figure 1 A rear view of the first housing after it is opened;

[0028] Figure 4 for Figure 2 A rear view of the first housing after it is opened;

[0029] Figure 5 This is a schematic structural diagram of the first shell of an embodiment of the present application;

[0030] Figure 6 This is an exploded schematic diagram of the second shell of the embodiment of the present application;

[0031] Figure 7 This is a schematic structural diagram of the first core according to an embodiment of the present application;

[0032] Figure 8 This is a schematic diagram of the internal structure of another AC transformer according to an embodiment of the present application (with the housing open);

[0033] Figure 9 for Figure 8 A is an enlarged structural diagram of FIG.

[0034] Among them: 100, first shell; 110, first iron core; 111, iron core shell; 120, first column; 121, positioning protrusion; 122, sliding hole; 130, second column; 131, jack; 140, wire groove; 150, spring; 200, second shell; 201, base; 202, buckle cover; 210, second iron core; 220, limit block; 230, push plate; 231, positioning hole; 240, protrusion. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described in the embodiments are intended to be used to explain the present application and should not be construed as limiting the present application.

[0036] References in this specification to "one embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment itself can be included in at least one embodiment disclosed herein. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0037] In the existing technology, current transformers are typically configured as split-type and clamp-type current transformers. When in use, the housing must be flipped outward or simultaneously flipped to both sides. This requires a larger space, making it inconvenient to use in confined spaces. Split-type current transformers also require the opening to be fixed after the cable is installed, making installation difficult. Clamp-type current transformers require elastic members for rebound support, which has poor stability and a laborious installation process. To address these issues, the present technicians proposed a lock-type current transformer.

[0038] like Figures 1 to 9 As shown, this embodiment proposes a current transformer, including a first shell 100 and a second shell 200, wherein a first iron core 110 is provided in the first shell 100, and a second iron core 210 is provided in the second shell 200, the first shell 100 includes a first cylinder 120 and a second cylinder 130 arranged at intervals, the interval between the first cylinder 120 and the second cylinder 130 is formed as a wire groove 140, and a sliding hole 122 is provided on the first cylinder 120, and the second shell 200 is slidably connected in the sliding hole 122 and can be connected between the first cylinder 120 and the second cylinder 130, so that the first iron core 110 in the first shell 100 and the second iron core 210 in the second shell 200 form a closed iron core.

[0039] When in use, first place the second housing 200 of the circuit transformer in a position as shown in FIG. Figure 1 In the position shown, slide the second shell 200 toward the first column 120 to open the notch at the upper end of the wire groove 140 of the first shell 100, place the cable to be tested in the wire groove 140, and then slide the second shell 200 of the circuit transformer to the bottom toward the second column 130, and make the second shell 200 slidably connected in the sliding hole 122 and able to be connected between the first column 120 and the second column 130, so that the first iron core 110 in the first shell 100 and the second iron core 210 in the second shell 200 form a closed iron core. At this time, the cable to be tested is located inside the closed iron core, and the current flowing in the cable can be detected by the battery induction principle.

[0040] In this embodiment, a first iron core 110 is provided in the first shell 100, a second iron core 210 is provided in the second shell 200, and a wire groove 140 is formed between the first column 120 and the second column 130 of the first shell 100. A sliding hole 122 is provided on the first column 120 and the second shell 200 slides in the sliding hole 122 to realize the opening and closing of the wire groove 140 of the first shell 100 by the second shell 200. The second shell 200 is connected to the first column 120 and the second column 130. In the case between the two cylinders 130, the first iron core 110 and the second iron core 210 form a closed iron core, and the wire trough 140 is located in the closed iron core, so that when the cable is installed in the wire trough 140, the cable is located inside the closed iron core, and the current transformer can detect the current flowing through the cable. By setting the first shell 100 and the second shell 200 as a sliding connection, the opening and closing process of the wire trough 140 is simplified, and by adjusting the movement direction of the first shell 100, the current transformer can be easily used in a narrow space.

[0041] Specifically, such as Figures 3 to 5 As shown, the second column 130 is provided with an insertion hole 131, which is arranged opposite to the sliding hole 122. The second shell 200 includes a first end and a second end. When the second shell 200 slides toward the second column 130 in the sliding hole 122, the first end of the second shell 200 can be inserted into the insertion hole 131. Figure 3 、 4 As shown, a socket 131 is provided on the second column 130, opposite to the sliding hole 122. When the second housing 200 slides within the sliding hole 122 toward the second column 130, the first end of the second housing 200 can be inserted into the socket 131, so that the first end of the second housing 200 is located within the socket 131 and the second end is located within the sliding hole 122. The second housing 200 is fixed to the notch of the wire channel 140 of the first housing 100 through the socket 131 and the sliding hole 122. In some embodiments, the first end of the second housing 200 forms a tight plug-in connection with the socket 131, and the second housing 200 is tightly fitted to the sidewall of the sliding hole 122, making the connection between the first housing 100 and the second housing 200 more stable.

[0042] like Figure 3 、 4As shown, in this embodiment, the first housing 100 and the first core 110 are both configured as a U-shape, the second housing 200 is configured as an elongated strip, and the second housing 200 is slidably connected to the notch of the wire trough 140. The second core 210 is configured as a strip or U-shape and can form a closed annular core with the first core 110. The U-shape of the first housing 100 and the first core 110, and the elongated strip shape of the second housing 200 that is slidably connected to the notch of the wire trough 140, make the overall structure of the current transformer compact and reasonable, reduce the overall size of the current transformer, and further expand its scope of application.

[0043] In this embodiment, if Figure 7 As shown, protrusions bent in the same direction are formed on both ends of the second core 210. The end surfaces of the protrusions extend through the first housing 100 or are flush with the outer surface of the first housing 100. The end surfaces of the protrusions are flat, and the end surfaces of the first core 110 are also flat. When the first end of the second housing 200 is inserted into the insertion hole 131, the end surfaces of the protrusions on both sides of the second core 210 are tightly fitted with the end surfaces of the first core 110. The height of the protrusions of the second core 210 is set to 1 to 5 mm. By forming downwardly bent protrusions at both ends of the second core 210 and allowing the two end surfaces of the protrusions to tightly fit with the end surfaces of the first core 110, the closed core formed by the first core 110 and the second core 210 is more tightly closed, the gap between the first core 110 and the second core 210 is smaller, and the measurement accuracy of the current transformer is improved.

[0044] Specifically, such as Figure 8 、 9As shown, a protrusion 240 is provided at the bottom of the first end of the second shell 200, and a slope facing the front end is also provided at the front end of the protrusion 240. During the process of inserting the first end of the second shell 200 into the insertion hole 131, the first end of the second shell 200 is gradually lifted upward along the slope and the protrusion 240 to prevent the second shell 200 from interfering with the first shell 100 and the first iron core 110 during the insertion process of the second shell 200 and getting stuck and unable to be inserted into the insertion hole 131. That is, by providing the slope and the protrusion 240, the second shell 200 can slide more smoothly in the sliding hole 122. In this embodiment, the core shell 111 can also be set to a U-shape that matches the first core 110, and end portions are provided at both ends. The end portions are tightly connected and clamped inside the first shell 100, and the core shell 111 is tightly wrapped around the outside of the first core 110 to clamp the first core 110 inside the first shell 100, preventing the first core 110 from shaking inside the first shell 100, and further ensuring that the first core 110 and the second core 210 can be tightly fitted and enclosed to form a closed core. Several elastic members for supporting the core shell 111 are provided between the bottom of the core shell 111 and the inner bottom surface of the first shell 100. The elastic member is set as a spring or a spring. In this embodiment, the elastic member is set as a spring 150 to push the core shell 111 upward to ensure that the first core 110 and the second core 210 are tightly fitted.

[0045] Specifically, such as Figure 4 As shown, a push plate 230 is provided on the second end of the second housing 200 for pushing and pulling the second housing 200 to slide within the sliding hole 122. When the first end of the second housing 200 is inserted into the insertion hole 131, the push plate 230 can be fitted with the first column 120. By providing the push plate 230 on the second end of the second housing 200, it is possible to more conveniently push and pull the second housing 200 and make it slide within the first housing 100.

[0046] Specifically, such as Figure 1 、 2 As shown, the push plate 230 is provided with a positioning hole 231, and the surface of the first column 120 is provided with a corresponding positioning protrusion 121 that cooperates with the positioning hole 231. When the push plate 230 and the first column 120 are in contact, the positioning protrusion 121 is snapped into the positioning hole 231. By providing the mutually cooperating positioning holes 231 and positioning protrusions 121 on the surfaces of the push plate 230 and the first column 120, respectively, the connection of the second housing 200 within the sliding hole 122 is more stable, preventing the second housing 200 from shaking.

[0047] Specifically, such as Figure 1 、 3As shown in FIG8 , the second shell 200 is provided with a limit block 220 for preventing the second shell 200 from coming out of the sliding hole 122 of the first shell 100. The limit block 220 is set as an elastic pressure block. An elastic member is set at the bottom of the limit block 220. When the elastic member is in a compressed state, the limit block 220 can be retracted inside the second shell 200 so that the second shell 200 can come out of the sliding hole 122. The top surface of the limit block 220 is set as a slope surface. The first end of the second shell 200 is inserted into the insertion hole 131 and is located Figure 8 In the position shown, the front end of the sloped face of the stopper 220 is inserted into the insertion hole 131, so that the stopper 220 presses the second housing 200 downward, thereby pressing the second core 210 within the second housing 200, further allowing the two end faces of the protruding portion of the second core 210 to fit more closely with the two end faces of the first core 110. Providing the stopper 220 on the second housing 200 prevents the second housing 200 from falling out of the sliding hole 122 of the first housing 100. Configuring the stopper 220 as an elastic pressure block allows the first housing 100 and the second housing 200 to be separated from each other, facilitating replacement or repair if one is damaged.

[0048] Specifically, such as Figure 4 As shown, a core housing 111 is tightly fitted over the first core 110, and a winding is wound around the outer circumference of the core housing 111. By fitting the core housing 111 over the first core 110, arranging the winding on the core housing 111, and connecting the winding to a measurement circuit, the current flowing through the winding can be measured to calculate the current within the cable under test.

[0049] In this embodiment, if Figure 1 As shown, the first column 120 and the second column 130 of the first housing 100 are arranged in parallel, and the second housing 200 is arranged perpendicular to the first column 120 and the second column 130. Through the above arrangement, the current transformer in this embodiment has a more reasonable structure, a smaller size, and is more convenient to install.

[0050] like Figure 5 As shown, the second housing 200 includes a snap-on cover 202 and a base 201. The snap-on cover 202 and base 201 are connected by a snap fit to form an installation chamber. The second core 210 is disposed within the installation chamber. The bottom surface of the base 201 is provided with a through hole. The second core 210 can pass through the through hole and form a closed core with the first core 110. By configuring the second housing 200 as a snap-on connection between the snap-on cover 202 and base 201, the second housing 200 is more convenient to assemble and disassemble, and the installation and replacement of the second core 210 is also facilitated.

[0051] The effects of this embodiment are described below with specific experimental data. The actual measurement data of the current transformer of this embodiment and the clamp-on transformer and split-type transformer of Comparative Example 1 on the same wire are described. The current flowing in the wire is set to 1A. The measurement data of the three are as follows:

[0052] Device Name Measurement value (A) error This embodiment 0.995 0.5％ Clamp-on current transformers 0.95 5％ Split current transformer 0.97 3％

[0053] It can be seen from the above table that the measurement error of the current transformer of this embodiment is greatly reduced compared with the clamp-on current transformer and the split-type current transformer, and the measurement accuracy is greatly improved.

[0054] To sum up, the current transformer of this embodiment is configured as a lock-type current transformer in which the first shell 100 and the second shell 200 are slidably connected, which solves the problem in the prior art that the open-and-close current transformer and the clamp-type current transformer require a large opening and closing space during installation, making the installation process simpler, effectively reducing the lateral space occupied during the installation process, and facilitating use in a small space; by forming downwardly bent protrusions at the two side ends of the second iron core 210, and setting the end faces of the protrusions and the two end faces of the first iron core 110 to be planes, after the current transformer is installed, the two end faces of the first iron core 110 are tightly fitted with the end faces of the two protrusions of the second iron core 210, so that the first iron core 110 and the second iron core 210 can form a complete closed iron core, thereby improving the measurement accuracy of the current transformer.

[0055] The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modifications that do not deviate from the functional and structural principles of the present application are included within the scope of the claims.

Claims

1. A current transformer, comprising a first shell (100) and a second shell (200), wherein a first iron core (110) is provided in the first shell (100), and a second iron core (210) is provided in the second shell (200), characterized in that: The first shell (100) includes a first column (120) and a second column (130) arranged at an interval, the interval between the first column (120) and the second column (130) forming a wire groove (140), the first column (120) being provided with a sliding hole (122), the second shell (200) being slidably connected in the sliding hole (122) and being capable of being connected between the first column (120) and the second column (130), so that the first iron core (110) in the first shell (100) and the second iron core (210) in the second shell (200) form a closed iron core.

2. The current transformer according to claim 1, characterized in that: The second column (130) is provided with an insertion hole (131), and the insertion hole (131) is arranged opposite to the sliding hole (122). The second shell (200) includes a first end and a second end. When the second shell (200) slides toward the second column (130) in the sliding hole (122), the first end of the second shell (200) can be inserted into the insertion hole (131).

3. The current transformer according to claim 2, characterized in that: The first shell (100) and the first iron core (110) are both configured as a U-shape, the second shell (200) is configured as a long strip, and the second shell (200) is slidably connected to the notch of the wire groove (140).

4. The current transformer according to claim 3, characterized in that: Both ends of the second iron core (210) are formed with protrusions bent in the same direction, and the end faces of the protrusions pass through the first shell (100) or are flush with the outer surface of the first shell (100). The end faces of the protrusions are formed into planes, and the two end faces of the first iron core (110) are also formed into planes. When the first end of the second shell (200) is inserted into the insertion hole (131), the end faces of the protrusions on both sides of the second iron core (210) are tightly fitted with the two end faces of the first iron core (110).

5. The current transformer according to claim 4, characterized in that: The height of the protruding portion of the second iron core (210) is set to 1 to 5 mm.

6. The current transformer according to claim 2, characterized in that: A protrusion (240) is provided at the bottom of the first end of the second shell (200), and when the first end of the second iron core (210) is inserted into the insertion hole (131), the protrusion (240) lifts the first end of the second shell (200) upward.

7. The current transformer according to claim 6, characterized in that: An elastic member is provided between the inner top surface of each of the first column (120) and the second column (130) and the second iron core (210); when the first iron core (110) and the second iron core (210) form a closed iron core, the elastic member presses the second iron core (210) downward.

8. The current transformer according to claim 1, characterized in that: An iron core shell (111) is tightly fitted onto the first iron core (110), and a winding is wound on the outer circumference of the iron core shell (111).

9. The current transformer according to claim 8, characterized in that: The core shell (111) is configured to be U-shaped and matched with the first core (110). End portions are provided at both ends of the core shell (111), and the end portions are clamped inside the first shell (100). The core shell (111) is wrapped around the outside of the first core (110), so that the first core (110) is clamped inside the first shell (100).

10. The current transformer according to claim 9, characterized in that: A plurality of elastic members for supporting the core shell (111) are provided between the bottom of the core shell (111) and the inner bottom surface of the first shell (100).

11. The current transformer according to claim 2, characterized in that: A push plate (230) is provided on the second end of the second shell (200) for pushing and pulling the second shell (200) to slide in the sliding hole (122), and the push plate (230) can fit with the first column (120) when the first end of the second shell (200) is inserted into the insertion hole (131).

12. The current transformer according to claim 11, characterized in that: A positioning hole (231) is provided on the push plate (230), and a positioning protrusion (121) that cooperates with the positioning hole (231) is correspondingly provided on the surface of the first column (120). When the push plate (230) and the first column (120) are in contact with each other, the positioning protrusion (121) is inserted into the positioning hole (231).

13. The current transformer according to any one of claims 1 to 11, characterized in that: The second shell (200) is provided with a limiting block (220) for preventing the second shell (200) from falling out of the sliding hole (122) of the first shell (100).

14. The current transformer according to claim 13, characterized in that: The limit block (220) is configured as an elastic pressure block, and an elastic member is provided at the bottom of the limit block (220). When the elastic member is in a compressed state, the limit block (220) can be retracted inside the second shell (200) so that the second shell (200) can be removed from the sliding hole (122).

15. The current transformer according to any one of claims 1 to 11, characterized in that: The first column (120) and the second column (130) of the first shell (100) are arranged in parallel, and the second shell (200) is arranged perpendicular to the first column (120) and the second column (130).

16. The current transformer according to any one of claims 1 to 11, characterized in that: The second shell (200) includes a buckle cover (202) and a base (201), wherein the buckle cover (202) and the base (201) are snap-connected to form an installation chamber, and the second iron core (210) is arranged in the installation chamber, and a through hole is provided on the bottom surface of the base (201), and the second iron core (210) can pass through the through hole and form a closed iron core with the first iron core (110).

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