Electric energy meter with electric leakage detection function
By integrating a detection mechanism and an alarm mechanism into the electricity meter, and using a closed iron core and induction coil to detect leakage current, the problems of low sensitivity and the need for regular maintenance of leakage current protectors are solved, achieving high-precision autonomous leakage current detection and timely alarm.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 武汉阿迪克电子股份有限公司
- Filing Date
- 2025-08-18
- Publication Date
- 2026-07-24
AI Technical Summary
Existing residual current devices (RCDs) have low sensitivity to detecting minute leakage currents and require regular maintenance by users. Neglecting maintenance can easily lead to RCD malfunctions and failure to trip in time. Professional testing requires intervention from professionals.
Design an energy meter with leakage current detection function, including a detection mechanism, a positioning mechanism, and an alarm mechanism. It uses a closed iron core and an induction coil to detect leakage current and issues an alarm through the alarm mechanism. It includes a combination of a closed iron core, an induction coil, a positioning mechanism, and an alarm mechanism, and is adaptable to fixing different types of wires. The alarm mechanism is a leakage current alarm.
It achieves high-precision detection of minute leakage current, allowing users to detect leakage in a timely manner without the need for professional testing, simplifying the modification process, reducing the risk of misjudgment, and without forcibly cutting off power.
Smart Images
Figure CN224553342U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electricity meter technology, and in particular to an electricity meter with leakage current detection function. Background Technology
[0002] An electricity meter is an instrument used to measure electrical energy. It is also called an electricity meter, watt-hour meter, or kilowatt-hour meter. It refers to an instrument that measures various electrical quantities.
[0003] Leakage current typically occurs inside aging electrical appliances, such as when the internal insulation of the appliance is damaged, causing the live wire to come into contact with the metal casing. It can also be caused by aging or damaged wiring within the walls, loose wiring in sockets or switches, or short circuits due to moisture. When leakage current occurs, the reading on the household electricity meter will continue to rise, but users often cannot detect it in time. In such cases, they rely on whether the residual current device (RCD) trips to determine the cause.
[0004] Regarding the aforementioned technologies, the inventors believe that the following defects exist: the leakage current device has low sensitivity to detect minor leakage current, and the leakage current device needs to be maintained by pressing the test button once a month. If the user neglects maintenance, the leakage current device may malfunction and fail to trip. If the user suspects leakage current, but the leakage current device does not trip or is not installed, the circuit needs to be measured by a professional. Summary of the Invention
[0005] To address the problem of minute leakage in circuits or electrical appliances being difficult to detect, this application provides an energy meter with leakage detection function.
[0006] The energy meter with leakage current detection function provided in this application adopts the following technical solution: An energy meter with leakage current detection function includes a meter body, on which an input live wire, an output live wire, an input neutral wire, and an output neutral wire are connected, and further includes: The testing mechanism includes a closed iron core disposed on the meter body and an induction coil wound on the closed iron core, wherein the input live wire and the input neutral wire pass through the closed iron core together; A positioning mechanism is used to locate the positions of the input live wire and the input neutral wire relative to the closed iron core; An alarm mechanism, electrically connected to the induction coil, is used to issue an alarm signal based on the current generated by the induction coil.
[0007] Optionally, the positioning mechanism includes a fixed locking block fixed to the watch body, a movable locking block abutting against the fixed locking block, and a connecting member for connecting the fixed locking block and the movable locking block. The connecting member is a screw threaded into the fixed locking block, the screw passing through the movable locking block, and the head of the screw abutting against the movable locking block. The positioning mechanism also includes clamping blocks disposed on the fixed locking block and the movable locking block and close to each other on one side. The clamping blocks have a first clamping groove adapted to the input live wire on the close side of the clamping blocks.
[0008] Optionally, both the fixed card block and the movable card block are easily peeled and bonded to the clamping block, and a second clamping groove is provided on the side of the fixed card block and the movable card block that are close to each other.
[0009] Optionally, both the fixed clamping block and the movable clamping block penetrate the closed iron core and extend beyond both ends of the closed iron core coil, and the length directions of the first clamping groove and the second clamping groove are both perpendicular to the closed iron core.
[0010] Optionally, the edges of both the first clamping groove and the second clamping groove are rounded.
[0011] Optionally, the alarm mechanism is a leakage current alarm, the detection signal input terminal of the leakage current alarm is electrically connected to both ends of the induction coil, and the operating power supply terminal of the leakage current alarm is electrically connected to the input live wire and the input neutral wire.
[0012] Optionally, the leakage current alarm has a built-in indicator light and / or buzzer.
[0013] Optionally, an insulating protective shell is fixed to the body of the meter, and the insulating protective shell encloses the induction coil and the closed iron core.
[0014] In summary, this application includes at least one of the following beneficial technical effects: 1. When there is no leakage, the current between the input live wire and the input neutral wire is equal and opposite in direction. At this time, the magnetic field on the closed iron core cancels out, the induction coil will not generate an induced current, and the alarm mechanism will not sound an alarm. When a leakage occurs, part of the current will not return to the input neutral wire through the output neutral wire, but will flow through the ground wire or the earth. At this time, the current in the input live wire is greater than the current in the input neutral wire. The closed iron core generates an alternating magnetic field, which in turn generates an alternating current in the induction coil. When the alarm mechanism receives the current generated by the induction coil, it will sound an alarm to remind the user of the leakage. This process will not force a power outage, and the modification of the detection mechanism, positioning mechanism, and alarm mechanism on old energy meters is relatively simple. 2. If the wire is a thin wire of 6 square millimeters, pass the input live wire and input neutral wire through the first clamping slot on the fixed block, and then abut the clamping block on the movable block against the clamping block on the fixed block, so that the first clamping slots on the fixed block and the movable block close together to form a cylindrical groove; if the wire is a thick wire of 10 square millimeters, remove the clamping block, then abut the fixed block and the movable block together, and then tighten the screw to complete the fixing of the input live wire and input neutral wire. This method is suitable for most working conditions and has a simple structure. 3. When there is no current in the induction coil, the power light and normal light on the leakage current alarm will light up, the leakage current light will turn off, and the buzzer will stop sounding; when the leakage current alarm detects current in the induction coil, the power light and leakage current light on the leakage current alarm will light up, the normal light will turn off, and the buzzer will sound to remind the user of the leakage current situation. The alarm signal is relatively obvious. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a cross-sectional structural diagram used in this application to illustrate the input live wire, input neutral wire, detection mechanism, positioning mechanism, leakage current alarm and insulating protective shell; Figure 3 This is a structural diagram used in this application to illustrate the positioning mechanism.
[0016] Reference numerals: 1. Meter body; 11. Input live wire; 12. Output live wire; 13. Input neutral wire; 14. Output neutral wire; 2. Detection mechanism; 21. Closed iron core; 22. Induction coil; 3. Positioning mechanism; 31. Fixed block; 32. Movable block; 33. Screw; 34. Clamping block; 35. First clamping slot; 36. Second clamping slot; 4. Leakage alarm; 5. Insulating protective shell. Detailed Implementation
[0017] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.
[0018] This application discloses an energy meter with leakage current detection function. (Refer to...) Figure 1 and Figure 2An energy meter with leakage current detection function includes a meter body 1, on which an input live wire 11, an output live wire 12, an input neutral wire 13, and an output neutral wire 14 are electrically connected. It also includes: a detection mechanism 2, which comprises a closed iron core 21 mounted on the meter body 1 and an induction coil 22 wound on the closed iron core 21. The input live wire 11 and the input neutral wire 13 both pass through the closed iron core 21, which is a ferrite core; a positioning mechanism 3, used to position the input live wire 11 and the input neutral wire 13 relative to the closed iron core 21; and an alarm mechanism, electrically connected to the induction coil 22, used to issue an alarm signal based on the current generated by the induction coil 22.
[0019] The input live wire 11 and output live wire 12 are confined within the closed iron core 21 by the positioning mechanism 3. When there is no leakage, the currents between the input live wire 11 and the input neutral wire 13 are equal and opposite in direction. At this time, the magnetic fields on the closed iron core 21 cancel each other out, the induction coil 22 will not generate an induced current, and the alarm mechanism will not sound an alarm. When a leakage occurs, part of the current will not return to the input neutral wire 13 through the output neutral wire 14, but will flow through the ground wire or the earth. At this time, the current in the input live wire 11 is greater than the current in the input neutral wire 13. The closed iron core 21 generates an alternating magnetic field, which in turn generates an alternating current in the induction coil 22. The detection accuracy is high. When the alarm mechanism receives the current generated by the induction coil 22, it will sound an alarm to remind the user of the leakage. This process will not force a power outage, and the modification of the detection mechanism 2, positioning mechanism 3, and alarm mechanism on old energy meters is relatively simple.
[0020] Reference Figure 1 and Figure 3 The positioning mechanism 3 includes a fixed locking block 31 fixed to the meter body 1, a movable locking block 32 abutting against the fixed locking block 31, and a connector for connecting the fixed locking block 31 and the movable locking block 32. The connector is a plurality of screws 33 passing through the movable locking block 32. There are two screws 33, which are located on both sides of the movable locking block 32. The screws 33 are plastic screws. The heads of the screws 33 abut against the movable locking block 32. The positioning mechanism 3 also includes a clamping block 34 disposed on the fixed locking block 31 and the movable locking block 32 and close to each other on one side. The fixed locking block 31, the movable locking block 32 and the clamping block 34 are all made of insulating plastic. The clamping block 34 has a first clamping groove 35 adapted to the input live wire 11 on the side close to each other. The connector can also be electrical tape wrapped between the fixed locking block 31 and the movable locking block 32.
[0021] When wiring the electricity meter, the input live wire 11 and the input neutral wire 13 are passed through the first clamping groove 35 on the fixed block 31. Then, the movable block 32 is attached to the fixed block 31, so that the first clamping groove 35 on the fixed block 31 and the movable block 32 form a cylindrical groove, which clamps and fixes the input live wire 11 and the input neutral wire 13. Finally, the screw 33 is tightened to complete the fixing of the input live wire 11 and the input neutral wire 13. The structure is simple, the operation is convenient, the cost is low, and the clamping stability is good, which effectively reduces the false alarm caused by the shaking of the input live wire 11 and the input neutral wire 13 located in the closed iron core 21.
[0022] Reference Figure 2 Both the fixed locking block 31 and the movable locking block 32 are easily peeled and bonded to the clamping block 34. The easy-peel bonding method can be double-sided adhesive. Other connection methods can also be used between the fixed locking block 31 and the movable locking block 32, such as: wedge-shaped grooves are formed on the fixed locking block 31 and the movable locking block 32, and a wedge block with interference fit is fixed to the clamping block 34, i.e., by squeezing the wedge block, the wedge block undergoes slight elastic deformation and is clamped in the wedge groove. A second clamping groove 36 is formed on the side of the fixed locking block 31 and the movable locking block that is close to each other. Both the fixed locking block 31 and the movable locking block 32 penetrate the closed iron core 21 and extend beyond both ends of the coil of the closed iron core 21. The length direction of both the first clamping groove 35 and the second clamping groove 36 is perpendicular to the closed iron core 21. The edges of both the first clamping groove 35 and the second clamping groove 36 are rounded to prevent damage to the input live wire 11 and the input neutral wire 13.
[0023] Since household electrical wires typically use either 6 square millimeters or 10 square millimeters, if the wire used during wiring is a thinner 6 square millimeter wire, simply connect the fixed clip 31 and the movable clip 32 to fix the input live wire 11 and the input neutral wire 13 in the first clamping slot 35. If the wire used during wiring is a thicker 10 square millimeter wire, remove the clamping block 34, then place the input live wire 11 and the input neutral wire 13 into the corresponding second clamping slot 36 of the fixed clip 31, and then move the movable clip 32 against the fixed clip 31. Tighten the screw 33 to fix the input live wire 11 and the input neutral wire 13 in the second clamping slot 36.
[0024] Reference Figure 1The alarm mechanism is a leakage current alarm 4 with built-in indicator lights and / or buzzers. In this application, the leakage current alarm 4 integrates indicator lights and buzzers and is located on the housing of the leakage current alarm 4. There are three indicator lights, namely power light, leakage current light and normal light. The leakage current alarm 4 can be RCM or other leakage current alarms conforming to GB / T 16916.1 standard. The detection signal input terminal of the leakage current alarm 4 is electrically connected to the two ends of the induction coil 22, and the working power supply terminal of the leakage current alarm 4 is electrically connected to the input live wire 11 and the input neutral wire 13, respectively.
[0025] When the leakage current alarm 4 detects current in the induction coil 22, the power light and leakage current light on the leakage current alarm 4 light up, the normal light goes out, and the buzzer sounds to remind the user of the leakage current situation; when there is no current in the induction coil 22, the power light and normal light on the leakage current alarm 4 light up, and the leakage current light goes out.
[0026] Reference Figure 2 An insulating protective shell 5 is fixed to the body 1. The insulating protective shell 5 encloses the induction coil 22 and the closed iron core 21. The insulating protective shell 5 can be a plastic shell to provide better protection for the closed iron core 21 and the induction coil 22 and reduce the interference caused by environmental factors to the closed iron core 21 and the induction coil 22.
[0027] The implementation principle of an energy meter with leakage current detection function according to an embodiment of this application is as follows: Determine the wire type. If the wire is a thin wire of six square millimeters, pass the input live wire 11 and the input neutral wire 13 through the first clamping groove 35 on the fixed block 31, and then abut the clamping block 34 on the movable block 32 against the clamping block 34 on the fixed block 31, so that the first clamping groove 35 on the fixed block 31 and the movable block 32 together form a cylindrical groove; if the wire is a thick wire of ten square millimeters, remove the clamping block 34, and then abut the fixed block 31 and the movable block 32 together, and then tighten the screw 33 to complete the fixing operation of the input live wire 11 and the input neutral wire 13.
[0028] When there is no leakage, the current between the input live wire 11 and the input neutral wire 13 is equal and opposite in direction. At this time, the magnetic field on the closed iron core 21 cancels out, the induction coil 22 will not generate an induced current, and the alarm mechanism will not sound an alarm. When a leakage occurs, part of the current will not return to the input neutral wire 13 through the output neutral wire 14, but will flow through the ground wire or the earth. At this time, the current of the input live wire 11 is greater than the current of the input neutral wire 13. The closed iron core 21 generates an alternating magnetic field, which in turn generates an alternating current in the induction coil 22. When the alarm mechanism receives the current generated by the induction coil 22, it will sound an alarm to remind the user that a leakage has occurred. This process will not force a power outage, and the modification of the detection mechanism 2, the positioning mechanism 3 and the alarm mechanism on old energy meters is relatively simple.
[0029] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. An energy meter with leakage current detection function, comprising a meter body (1), wherein an input live wire (11), an output live wire (12), an input neutral wire (13), and an output neutral wire (14) are connected to the meter body (1), characterized in that: Also includes: The detection mechanism (2) includes a closed iron core (21) disposed on the meter body (1) and an induction coil (22) wound on the closed iron core (21), wherein the input live wire (11) and the input neutral wire (13) pass through the closed iron core (21). Positioning mechanism (3) is used to position the input live wire (11) and the input neutral wire (13) relative to the closed iron core (21); An alarm mechanism, electrically connected to the induction coil (22), is used to issue an alarm signal based on the current generated by the induction coil (22).
2. The energy meter with leakage current detection function according to claim 1, characterized in that: The positioning mechanism (3) includes a fixed block (31) fixed to the body (1), a movable block (32) abutting against the fixed block (31), and a connector for connecting the fixed block (31) and the movable block (32). The connector is a screw (33) threaded into the fixed block (31), the screw (33) passing through the movable block (32), and the head of the screw (33) abutting against the movable block (32). The positioning mechanism (3) also includes a clamping block (34) disposed on the fixed block (31) and the movable block (32) and close to each other on one side. The clamping block (34) has a first clamping groove (35) adapted to the input fire wire (11) on the side close to each other.
3. An energy meter with leakage current detection function according to claim 2, characterized in that: Both the fixed card block (31) and the movable card block (32) are easily peeled and bonded to the clamping block (34). The fixed card block (31) and the movable card block are provided with a second clamping groove (36) on the side of each other that is close to each other.
4. An energy meter with leakage current detection function according to claim 3, characterized in that: Both the fixed clamp (31) and the movable clamp (32) penetrate the closed iron core (21) and extend beyond both ends of the coil of the closed iron core (21), and the length directions of the first clamping groove (35) and the second clamping groove (36) are perpendicular to the closed iron core (21).
5. An energy meter with leakage current detection function according to claim 3, characterized in that: The edges of the first clamping groove (35) and the second clamping groove (36) are both rounded.
6. An energy meter with leakage current detection function according to claim 1, characterized in that: The alarm mechanism is a leakage current alarm (4). The detection signal input terminal of the leakage current alarm (4) is electrically connected to both ends of the induction coil (22). The working power supply terminal of the leakage current alarm (4) is electrically connected to the input live wire (11) and the input neutral wire (13).
7. An energy meter with leakage current detection function according to claim 6, characterized in that: The leakage current alarm (4) has a built-in indicator light and / or buzzer.
8. An energy meter with leakage current detection function according to claim 1, characterized in that: An insulating protective shell (5) is fixedly attached to the body (1), and the insulating protective shell (5) encloses the induction coil (22) and the closed iron core (21).