Threading type leakage current sensor
By setting the PCB board above the magnetic core in the threaded leakage current sensor and centrally arranging components, the problem of insufficient space utilization of existing RCD equipment is solved, and effective space saving and convenience of installation are achieved.
Patent Information
- Application Number
- CN202421525305.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-06-20
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The existing RCD equipment has a large area of empty board design, which leads to insufficient space utilization and is difficult to save space.
A threaded leakage current sensor is designed. By setting a PCB board above the magnetic core, components are arranged centrally, which saves large-area empty boards, and the housing installation of the sensor is conveniently completed through multiple connecting slots and connection parts.
It effectively saves space, simplifies the sensor installation process, and selects a configurable output method through multiple lines to meet the use of multiple application scenarios, while reducing the repeated layout of lines.
Smart Images
Figure CN223006282U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of current detection, in particular to a threading type leakage current sensor. Background Technique
[0002] An RCD (Residual Current Device) is a device used to detect the magnitude of leakage current in a circuit. If an RCD is not installed in the circuit, when a person or an animal touches a high voltage, a leakage current will be generated to the ground. When the leakage current exceeds a certain threshold, it will cause the fibrillation of the heart of the person or the animal, leading to cardiac arrest and further causing life danger. If a leakage detection device such as an RCD is installed in the circuit, when there is a leakage current in the circuit and the magnitude of the leakage current signal exceeds the set threshold, the RCD will send an alarm signal to the actuating mechanism, triggering the actuating mechanism to quickly disconnect the circuit, thereby achieving the purpose of protecting life safety. However, there is a large area of empty board design in the existing RCDs on the market, and how to save space has also become a problem to be solved by the personnel in this field. Content of the Utility Model
[0003] The purpose of the utility model is to provide a threading type leakage current sensor for the existing technical defects, so as to solve the problems put forward in the above background technique.
[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: A threading type leakage current sensor, including a first housing and a second housing connected to the first housing. A first connection groove is provided in the middle of the first housing, a magnetic core is sleeved outside the first connection groove, the magnetic core is attached to the bottom of the first housing, and a PCB board is provided on one side above the magnetic core. The PCB board is arranged above the magnetic core, and the components are concentratedly arranged, eliminating a large area of empty board and effectively saving space.
[0005] The utility model further explains that a first connection part is provided at the position of the second housing corresponding to the first connection groove. The diameter length of the first connection groove is smaller than that of the first connection part. After the first connection groove and the first connection part are connected, a power measurement port is formed for performing detection procedures.
[0006] The utility model further explains that a second connection groove and several third connection grooves are provided on the inner wall of the first housing. A second connection part and several third connection parts are fixed on the side of the second housing facing the first housing. The second connection part and several third connection parts correspond to the second connection groove and several third connection grooves respectively, and can conveniently and effectively complete the installation of the sensor housing.
[0007] Further description of the present utility model: A set of mounting holes are provided on both sides of the surface of the PCB board. A limiting post is connected through the interior of each of the set of mounting holes, and a support block is fixedly connected below the limiting post.
[0008] Further description of the present utility model: The PCB board is provided with a multiple-choice resistor and an OR gate part connected to the multiple-choice resistor. By providing an output method with configurable multi-line selection, it not only meets the use in multiple application scenarios but also reduces the repeated layout of circuits.
[0009] Further description of the present utility model: An induction part and a self-test part are provided on the PCB board. The induction part is used to sense the measured current, and the self-test part is used to detect whether the functions of the RCD itself are normal; the induction part and the self-test part are respectively connected with a bidirectional diode, and corresponding bidirectional diodes are arranged on the test coil and the induction coil to perform bidirectional surge current protection and ESD protection.
[0010] Compared with the prior art, the beneficial effects achieved by the present utility model are:
[0011] By arranging the PCB board above the magnetic core, the present utility model enables the centralized arrangement of components, eliminating a large area of empty board and effectively saving space;
[0012] By providing a plurality of connecting grooves and matching connecting parts, the present utility model conveniently and effectively completes the installation of the housing of the sensor;
[0013] By providing an output method with configurable multi-line selection, the present utility model not only meets the use in multiple application scenarios but also reduces the repeated layout of circuits;
[0014] By arranging the induction part and the self-test part respectively connected with a bidirectional diode, corresponding bidirectional diodes are arranged on the test coil and the induction coil to perform bidirectional surge current and ESD protection. Description of the Drawings
[0015] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:
[0016] Figure 1 is the overall structural schematic diagram of the present utility model;
[0017] Figure 2 is the present utility model Figure 1 top view schematic diagram of the split structure;
[0018] Figure 3 is the present utility model Figure 1 bottom view schematic diagram of the split structure;
[0019] Figure 4 It is a schematic diagram of the PCB board splitting structure of the present utility model;
[0020] Figure 5 It is a schematic diagram of the component distribution on the PCB board of the present utility model;
[0021] Figure 6 It is a schematic diagram of the circuit connection of the components on the PCB board of the present utility model;
[0022] In the figure: 1. First housing; 2. Second housing; 3. First connection groove; 4. First connection part; 6. Second connection groove; 7. Second connection part; 8. Third connection part; 9. Third connection groove; 10. PCB board; 12. Multiselect resistor; 13. Magnetic core; 14. Diode two; 15. Diode five; 16. Diode three; 17. Diode four; 18. OR gate part; 19. Induction part; 20. Self-test part; 21. Limit post; 22. Support block. Specific embodiments
[0023] The technical solution of the present utility model will be further described in detail and non-limitingly below in conjunction with the preferred embodiments and their accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.
[0024] Please refer to Figures 1-4 , the present utility model provides a technical solution: A wire-passing leakage current sensor includes a first housing 1 and a second housing 2 connected to the first housing 1. A first connection groove 3 is provided in the middle of the first housing 1, and a first connection part 4 is provided at the position of the second housing 2 corresponding to the first connection groove 3. The first connection groove 3 and the first connection part 4 are both provided as but not limited to circular rings, and can also be elliptical or rectangular shapes, and the diameter of the first connection groove 3 is smaller than that of the first connection part 4. After the first connection groove 3 and the first connection part 4 are connected, a power measurement port is formed for the sensor to be connected to the circuit to be measured for the detection process.
[0025] Furthermore, a second connection groove 6 and several third connection grooves 9 are provided on the inner wall of the first housing 1. A second connection portion 7 and several third connection portions 8 are fixed on the side of the second housing 2 facing the first housing 1. The second connection portion 7 and several third connection portions 8 correspond to the second connection groove 6 and several third connection grooves 9 in position respectively, and the second connection portion 7 can be slidably connected to the second connection groove 6 for pre-positioning when the first housing 1 and the second housing 2 are connected to determine their connection positions. Then, by continuously inserting the second connection portion 7 into the second connection groove 6, the installation connections between the third connection portion 8 and the third connection groove 9, the first connection groove 3, and the first connection portion 4 are respectively realized, and the housing installation process of the sensor is completed conveniently and effectively.
[0026] Reference Figure 2 、 Figure 4 , a magnetic core 13 is sleeved outside the first connection groove 3. The magnetic core 13 is arranged in contact with the bottom of the first housing 1. One side above the magnetic core 13 is provided with a PCB board 10. A set of mounting holes are opened on both sides of the surface of the PCB board 10. Limiting columns 21 are connected through the inside of the set of mounting holes. A support block 22 is fixedly connected below the limiting column 21. The support block 22 is used to support the upper PCB board 10, and the limiting column 21 is used to limit the PCB board 10 in the housing, that is, the installation of the PCB board 10 is completed. At the same time, the PCB board 10 in this solution is above the magnetic core 13, and the components are arranged centrally, saving a large area of empty board and effectively saving space.
[0027] Reference Figure 5 、 Figure 6 , for the circuit product position design of the components on the PCB board 10, the PCB board 10 is provided with a multi-select resistor 12 and an OR gate part 18 connected to the multi-select resistor 12, thereby providing a multi-line selection configurable output method, which can not only meet special DC or AC single-receiving application scenarios, but also realize the output and acquisition of DC and AC on the same line. Specifically, when the multi-select resistor 12 is connected to a 0Ω resistor, it is a dual-line DC or AC output respectively; when the multi-select resistor 12 is not connected to a resistor and remains open, the DC and AC output lines are combined, and the OR gate part 18 is used to solve the problem that the DC and AC signals will affect each other after the DC and AC are combined; therefore, by providing a multi-line selection configurable output method, it not only meets the use of multiple application scenarios, but also reduces the repeated layout of the lines;
[0028] Among them, when the DC is triggered, the high level is pulled down by the AC and cannot output 5V, and the AC trigger level becomes a process of gradually rising from 0V to 5V. Both problems will affect the client's discrimination of the leakage current.
[0029] Furthermore, an induction part 19 and a self-test part 20 are also arranged on the PCB board 10. The induction part 19 is used to sense the current to be measured, and the self-test part 20 is used to detect whether the RCD itself functions normally. The induction part 19 includes a diode three 16 and a diode four 17 that interact with the induction coil, and the self-test part 20 includes a diode two 14 and a diode five 15 that interact with the test coil. Among them, the diode two 14, the diode five 15, the diode three 16, and the diode four 17 are all arranged as bidirectional diodes. In this solution, corresponding bidirectional diodes are arranged on the test coil and the induction coil to perform bidirectional surge current protection and ESD protection, thereby improving the electrical safety.
[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, 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 should not be construed as a limitation to the present invention.
[0031] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A threading leakage current sensor, comprising a first housing (1) and a second housing (2) connected to the first housing (1), characterized in that: A first connecting groove (3) is provided in the middle of the first shell (1), a magnetic core (13) is sleeved outside the first connecting groove (3), the magnetic core (13) is arranged in contact with the bottom of the first shell (1), and a PCB board (10) is arranged on one side above the magnetic core (13).
2. A threading type leakage current sensor according to claim 1, characterized in that: The PCB board (10) is provided with a multiple-selection resistor (12) and an OR gate portion (18) connected to the multiple-selection resistor (12).
3. The threading type leakage current sensor according to claim 1, characterized in that: The PCB board (10) is provided with a sensing part (19) and a self-test part (20), and the sensing part (19) and the self-test part (20) are respectively connected to a bidirectional diode for surge current and ESD protection.
4. The threading type leakage current sensor according to claim 1, characterized in that: A first connecting portion (4) is provided at a position of the second shell (2) corresponding to the first connecting groove (3).
5. A threading type leakage current sensor according to claim 4, characterized in that: The diameter of the first connection groove (3) is smaller than the diameter of the first connection portion (4), and the first connection groove (3) and the first connection portion (4) are connected to form an electrical measurement port.
6. The threading type leakage current sensor according to claim 1, characterized in that: A second connecting groove (6) and a plurality of third connecting grooves (9) are provided on the inner wall of the first shell (1), and a second connecting portion (7) and a plurality of third connecting portions (8) are fixed to a side of the second shell (2) facing the first shell (1).
7. A threading type leakage current sensor according to claim 6, characterized in that: The second connection portion (7) and the plurality of third connection portions (8) correspond to the positions of the second connection groove (6) and the plurality of third connection grooves (9) respectively.
8. The threading type leakage current sensor according to claim 1, characterized in that: A group of mounting holes are provided on both sides of the surface of the PCB board (10), and a limiting column (21) is connected through the inside of each of the mounting holes. A support block (22) is fixedly connected below the limiting column (21).