Miniature mutual inductor inspection and test tool
By designing a testing fixture for miniature current transformers, a circuit is formed using a vertical column and a liftable contact terminal, which solves the problem of low testing efficiency for miniature current transformers, achieves efficient disassembly and electrical connection, and improves testing efficiency.
Patent Information
- Application Number
- CN202423187246.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-24
AI Technical Summary
Existing technologies for miniature current transformers have low testing efficiency and poor practicality, and cannot efficiently perform ratio testing and load testing.
A test fixture for miniature current transformers was designed, including a base, a test component, and a connection component. A circuit is formed by a vertical column and a liftable contact end, which simplifies the installation and electrical connection process of miniature current transformers.
It improves the efficiency of disassembly and assembly and testing of miniature current transformers, saves manpower and material resources, and enhances the practicality of testing.
Smart Images
Figure CN223742721U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of instrument transformer testing technology, specifically relating to a testing fixture for miniature instrument transformers. Background Technology
[0002] Instrument transformers undergo a series of rigorous tests before leaving the factory to ensure their performance and reliability meet standard requirements. These tests include ratio testing and load testing. Both tests require applying rated voltage or current to the primary side of the transformer and detecting the voltage or current output on the secondary side to determine whether the design requirements are met.
[0003] In existing technologies, when applying a rated voltage or current to the primary side of a current transformer, a wire needs to be threaded through the transformer's central hole. However, miniature current transformers lack the ability to be disassembled and installed freely on the wire. Therefore, only one end of the wire can be pulled through the miniature current transformer before being electrically connected to the power supply module. Additionally, the detection module needs to be electrically connected to the leads on the current transformer. This method is time-consuming, labor-intensive, slow, inefficient, and impractical during testing. Utility Model Content
[0004] This utility model provides a testing fixture for miniature current transformers, which aims to solve the problem of poor practicality caused by the low testing efficiency of existing testing methods for miniature current transformers.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a miniature current transformer testing fixture, comprising:
[0006] The base has a mounting platform; the mounting platform is provided with a vertical column; the base is provided with a power supply module that is electrically connected to the bottom end of the vertical column;
[0007] The test component, set on the mounting platform, has a through hole through which the vertical column passes;
[0008] A connecting component, disposed on the base, has a first contact end located above the vertical column and movable vertically, and a second contact end that can be electrically connected to the power supply module. The connecting component is used to allow the first contact end to descend to the top of the vertical column and contact the top of the vertical column after the miniature current transformer is sleeved on the test component and sleeved on the vertical column, and the second contact end to descend and electrically connect to the power supply module to form a circuit.
[0009] In one possible implementation, the test component includes:
[0010] The support base is detachably connected to the mounting platform;
[0011] An upright plate is mounted on the support base. The upright plate has two vertical slots, which are spaced apart. Each vertical slot extends through the top of the upright plate. Each vertical slot contains a spring piece. The two vertical slots are used to place the two leads of the miniature current transformer, and to make the leads contact with the spring pieces.
[0012] The test module is electrically connected to the two spring contacts respectively, and is used to measure the current and voltage generated by the current transformer.
[0013] In one possible implementation, the bottom end of the vertical column is detachably connected to the base.
[0014] In one possible implementation, the power supply module includes:
[0015] The voltage regulator's input terminal is connected to an external AC circuit.
[0016] The first terminal is electrically connected to one of the output terminals of the voltage regulator and is used for connecting the vertical column;
[0017] The second terminal is located below the second contact terminal and is used for contact by the second contact terminal.
[0018] In one possible implementation, the connection component includes:
[0019] A vertical arm is fixed on the base, and the vertical arm has a through hole arranged in the vertical direction;
[0020] A cantilever is horizontally positioned above the vertical arm. One end of the cantilever is provided with a conductive rod that can extend vertically into the through hole. The bottom end of the conductive rod is the second contact end.
[0021] A telescopic structure is fixedly mounted on the vertical arm, with the telescopic end fixedly connected to the cantilever to drive the cantilever to move up and down;
[0022] An elastic contact structure is provided on the vertical arm and corresponds to the top of the vertical column. The elastic contact structure is electrically connected to the conductive rod.
[0023] In one possible implementation, the elastic contact structure includes:
[0024] A contact slider is slidably disposed in a sliding cavity provided in the cantilever along the vertical direction, and the contact slider is the first contact end;
[0025] A spring is disposed in the sliding cavity and abuts against the contact slider, for springing the contact slider so that the contact slider has a tendency to move downward continuously;
[0026] The cantilever has a through hole for the top of the vertical column to extend into.
[0027] In this implementation, the vertical column on the base can ensure that the miniature current transformer under test can be fitted. At the same time, after the miniature current transformer is fitted on the vertical column, the connecting component can drive the first contact end and the second contact end to move downward to form a circuit with the power supply module. This can save manpower and material resources, improve the efficiency of disassembling and assembling the miniature current transformer, and thus improve the testing efficiency. It is highly practical. Attached Figure Description
[0028] Figure 1 A schematic diagram of the structure of the miniature current transformer testing fixture provided in this embodiment of the utility model;
[0029] Figure 2 A cross-sectional view of the micro transformer testing fixture provided in this embodiment of the utility model;
[0030] Explanation of reference numerals in the attached figures:
[0031] 10. Base; 11. Installation platform; 12. Vertical column;
[0032] 20. Test component; 21. Support base; 22. Vertical plate; 23. Vertical slot; 24. Spring piece;
[0033] 30. Connecting component; 31. Vertical arm; 32. Cantilever; 33. Telescopic structure; 34. Elastic contact structure; 341. Contact slider; 342. Spring; 35. Perforation; 36. Sliding cavity; 37. Conductive rod;
[0034] 40. Power supply module; 41. Voltage regulator; 42. First terminal; 43. Second terminal;
[0035] 50. Miniature current transformer. Detailed Implementation
[0036] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0037] Please refer to the following: Figure 1 and Figure 2The present invention provides a tooling for testing and inspecting miniature current transformers. The tooling includes a base 10, a testing component 20, and a connecting component 30. The base 10 has a mounting platform 11. A vertical column 12 is mounted on the mounting platform 11. A power supply module 40, electrically connected to the bottom end of the vertical column 12, is located in the base 10. The testing component 20 is mounted on the mounting platform 11 and has a through hole through which the vertical column 12 passes. The connecting component 30 is mounted on the base 10 and has a first contact end located above the vertical column 12 and movable vertically, and a second contact end electrically connected to the power supply module 40. After the miniature current transformer 50 is placed on the testing component 20 and mounted on the vertical column 12, the first contact end moves downwards to contact the top of the vertical column 12, and the second contact end moves downwards to connect electrically to the power supply module 40, thus forming a circuit.
[0038] Compared with the prior art, the miniature current transformer testing fixture provided in this embodiment has the advantage that the vertical column 12 on the base 10 can ensure that the miniature current transformer 50 under test can be fitted onto it. At the same time, after the miniature current transformer 50 is fitted onto the vertical column 12, the connecting component 30 can drive the first contact end and the second contact end to move downward to form a circuit with the power supply module 40, which can save manpower and material resources, improve the assembly and disassembly efficiency of the miniature current transformer 50, and thus improve the testing efficiency, making it highly practical. In addition, the testing component 20 can be used to place the miniature current transformer 50, which facilitates the testing process.
[0039] In some embodiments, the test component 20 described above may employ, for example... Figure 1 and Figure 2 The structure shown. See also Figure 1 and Figure 2 The test assembly 20 includes a support base 21, a vertical plate 22, and a test module. The support base 21 is detachably connected to the mounting platform 11. The vertical plate 22 is mounted on the support base 21 and has two vertical slots 23 spaced apart, each extending through the top of the vertical plate 22. Each vertical slot 23 contains a spring contact 24. The two vertical slots 23 allow the two leads of the miniature current transformer 50 to be placed separately, ensuring contact between the leads and the spring contact 24. The test module is electrically connected to the two spring contact 24 respectively, enabling the measurement of the current and voltage generated by the current transformer.
[0040] Since the two leads of the miniature transformer 50 correspond to its internal coil, they are typically rigid to ensure proper mounting of the miniature transformer 50 on the circuit board. Therefore, the two vertical slots 23 on the support plate 22 correspond to the two leads, ensuring that as the miniature transformer 50 is mounted on the vertical column 12 and moves from top to bottom, the two leads can respectively enter the two vertical slots and contact the two spring contacts 24 to form an electrical connection. This structure ensures that the miniature transformer 50 can be electrically connected to the test assembly 20 simultaneously during installation, further saving manpower and improving testing efficiency.
[0041] For information on shrapnel 24, please refer to [link / reference]. Figure 2 The top end of the spring piece 24 is fixed to one side wall of the corresponding vertical slot, and the other end extends diagonally downward toward the other side wall.
[0042] It should be noted that the via is located on the support base 21 and its diameter is larger than that of the vertical column 12. In addition, a placement ring can be provided on the support base 21 to ensure that the miniature current transformer 50 can be placed horizontally.
[0043] In this embodiment, the test module can be a multimeter electrically connected to the two spring contacts 24.
[0044] In some embodiments, the aforementioned vertical column 12 can be adopted as follows: Figure 2 The structure shown. See also Figure 2 The bottom end of the vertical column 12 is detachably connected to the base 10. This structure allows for the replacement of vertical columns 12 of different diameters according to different specifications of miniature current transformers 50, thus enhancing adaptability.
[0045] It should be noted that the bottom end of the vertical column 12 can be threaded to the base 10, that is, the bottom end is connected with a stud, and the outer wall surface of the vertical column 12 is covered with an insulating layer.
[0046] In some embodiments, the power supply module 40 described above may employ, for example... Figure 2 The structure shown. See also Figure 2 The power supply module 40 includes a voltage regulator 41, a first terminal 42, and a second terminal 43. The input terminal of the voltage regulator 41 is connected to an external AC circuit. The first terminal 42 is electrically connected to one of the output terminals of the voltage regulator 41, allowing connection to the vertical column 12. The second terminal 43 is located below the second contact terminal, allowing the second contact terminal to make contact.
[0047] The voltage regulator 41 ensures the regulation of the AC voltage, thereby ensuring the control of the output voltage. The first terminal 42 can be a first connecting block embedded in the base 10, and the first connecting block can be provided with a connecting hole for detachable connection to the bottom of the vertical column 12. The second terminal 43 can be a second connecting block located in the base 10, and the second connecting block corresponds to the second contact end.
[0048] In some embodiments, the connection component 30 described above may employ, for example... Figure 1 and Figure 2 The structure shown. See also Figure 1 and Figure 2 The connecting assembly 30 includes a vertical arm, a cantilever 32, a telescopic structure 33, and an elastic contact structure 34. The vertical arm is fixed to the base 10 and has a through hole arranged vertically. The cantilever 32 is horizontally positioned above the vertical arm, and one end of the cantilever 32 has a conductive rod 37 that can extend vertically into the through hole; the bottom end of the conductive rod 37 is a second contact end. The telescopic structure 33 is fixed to the vertical arm, and its telescopic end is fixedly connected to the cantilever 32 to drive the cantilever 32 to move up and down. The elastic contact structure 34 is disposed on the vertical arm and corresponds to the top of the vertical column 12; the elastic contact structure 34 is electrically connected to the conductive rod 37.
[0049] The vertical arm supports the cantilever 32, and the through hole on the vertical arm connects with the through hole on the base 10, ensuring that the conductive rod 37 can extend into the base 10 and abut against the second contact end. The telescopic structure 33 can move the cantilever 32 up and down, thereby ensuring that the elastic contact structure 34 is away from the vertical column 12. At this time, the miniature current transformer 50 can be disassembled and assembled, and the current on the vertical column 12 can also be disconnected.
[0050] This structure ensures convenient assembly and disassembly of the miniature current transformer 50, thereby improving testing efficiency.
[0051] In some embodiments, the above-described elastic contact structure 34 may employ, for example... Figure 2 The structure shown. See also Figure 2 The elastic contact structure 34 includes a contact slider 341 and a spring 342. The contact slider 341 is slidably disposed in a sliding cavity 36 provided in the cantilever 32 along the vertical direction. The spring 342 is disposed in the sliding cavity 36 and abuts against the contact slider 341, enabling it to spring the contact slider 341 so that the contact slider 341 has a tendency to move continuously downward. The other end of the spring 342 abuts against the bottom end of the sliding cavity 36 and is electrically connected to the conductive rod 37 through a wire.
[0052] Among them, the cantilever 32 is provided with a through hole 35 for the top of the vertical column 12 to be inserted.
[0053] The electrical connection between the first contact end and the vertical column 12, and the electrical connection between the second contact end and the power supply module 40, are performed simultaneously. Therefore, the spring 342 and the contact slider 341 can withstand height errors at the first and second contact ends, ensuring the stability of the circuit. For example, when the vertical column 12 abuts against the connecting slider, the bottom end of the conductive rod 37 does not abut against the power supply module 40. At this time, the cantilever 32 can continue to move downward, thereby compressing the spring 342 and causing the bottom end of the conductive rod 37 to contact the power supply module 40.
[0054] It should be noted that the perforation 35 ensures that the top of the vertical slide can pass through and contact the connecting slider.
[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A miniature transformer inspection test fixture, characterized by, The utility model relates to a micro mutual inductor test device, including: a base has a setting platform, and a vertical column is arranged on the setting platform, and a power supply module is arranged in the base and is electrically connected to the bottom end of the vertical column; a test assembly is arranged on the setting platform and has a through hole for the vertical column to pass through; a connecting assembly is arranged on the base and has a first contact end above the vertical column and capable of lifting and moving, and has a second contact end capable of being electrically connected to the power supply module, and the connecting assembly is used for placing a micro mutual inductor sleeve on the test assembly and sleeving the vertical column, so that the first contact end is lowered to contact the top end of the vertical column, and the second contact end is electrically connected to the power supply module to form a loop.
2. The micro-transformer verification test fixture of claim 1, wherein, The test assembly includes: a support seat is detachably connected to the setting platform; a vertical plate is arranged on the support seat, and the vertical plate has two vertical slots arranged at intervals, and each vertical slot penetrates the top end of the vertical plate; each vertical slot is provided with an elastic sheet; the two vertical slots are used for placing two lead wires of a micro mutual inductor respectively and making the lead wires contact the elastic sheets; a test module is electrically connected to the two elastic sheets respectively and is used for measuring the current and voltage generated by the mutual inductor.
3. The micro-transformer verification test fixture of claim 1, wherein, The bottom end of the vertical column is detachably connected to the base.
4. The micro-transformer verification test fixture of claim 3, wherein, The power supply module includes: a voltage regulator is connected to an external alternating current circuit at the input end; a first terminal post is electrically connected to one of the output ends of the voltage regulator and is used for connecting the vertical column; a second terminal post is arranged below the second contact end and is used for contacting the second contact end.
5. The micro-transformer verification test fixture of claim 1, wherein, The connecting assembly includes: a vertical arm is fixedly arranged on the base, and a through hole is arranged in the vertical arm in the vertical direction; a cantilever is horizontally arranged above the vertical arm, one end of the cantilever is provided with a conductive rod capable of extending into the through hole in the vertical direction, and the bottom end of the conductive rod is the second contact end; a telescopic structure is fixedly arranged on the vertical arm, and a telescopic end is fixedly connected to the cantilever to drive the cantilever to lift and move; an elastic contact structure is arranged on the vertical arm and corresponds to the top end of the vertical column, and the elastic contact structure is electrically connected to the conductive rod.
6. The micro-transformer verification test fixture of claim 5, wherein, The elastic contact structure includes: a contact slider is arranged in a sliding cavity in the cantilever in the vertical direction, and the contact slider is the first contact end; a spring is arranged in the sliding cavity and abuts against the contact slider and is used for driving the contact slider to have a downward moving trend; wherein a through hole is arranged on the cantilever for the top end of the vertical column to extend into.