Leakage test detection loop and release
By installing a torsion spring on the outside of the leakage current trip unit housing and adopting a double-break structure, the problems of large space and poor dielectric performance of the trip unit are solved, achieving space saving and improved dielectric performance, avoiding accidental activation, and ensuring equipment stability and safety.
Patent Information
- Application Number
- CN202423229240.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing leakage current trip devices occupy a large space, have poor dielectric properties, and the test button is prone to accidental activation, affecting equipment use.
Design a leakage current test detection circuit, which uses a first torsion spring and a second torsion spring installed on the outside of the trip unit housing. It adopts a double-break structure, which saves space and improves dielectric performance by utilizing the elastic deformation characteristics of the torsion spring. Two break points are set to simulate leakage current test signals and quickly cut off the power supply.
It reduces the design space of the trip unit, improves dielectric performance, avoids accidental activation, ensures the stability and reliability of the equipment, reduces maintenance costs, and extends the service life of the equipment.
Smart Images
Figure CN223743481U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a leakage current test detection circuit and a trip unit, belonging to the field of low-voltage electrical technology. Background Technology
[0002] A residual current device (RCD) is an electrical safety device that quickly cuts off power in the event of a leakage current to prevent electric shock. An RCD includes a test button and a test circuit mechanism that simulates a leakage current situation. By testing parameters such as current and voltage in the circuit, it detects the presence of a leakage current and verifies the RCD's proper functioning, ensuring it can quickly cut off power in the event of a leakage current, thus preventing electrical accidents. The installation and use standard GB13955 clearly stipulates that the test button and test circuit mechanism of the RCD must be pressed monthly to determine if the RCD's leakage protection device is functioning correctly.
[0003] In existing technologies, the test circuit of a test button is generally installed entirely within the residual current device (RCD), resulting in a large space occupied by the RCD and poor dielectric properties of the entire product. Furthermore, the test circuit of a test button typically contains only one break point, and controlling the entire circuit's on / off state via the test button can easily lead to accidental activation by operators, affecting the use of the equipment. Utility Model Content
[0004] This utility model provides a leakage current test detection circuit and trip unit, which solves the problems of leakage current trip units occupying a large space, having poor dielectric properties, and containing only one break point, which can easily cause workers to accidentally touch the circuit and affect the use of the equipment.
[0005] This utility model is achieved through the following technical solution:
[0006] In a first aspect, this utility model provides a leakage current test detection circuit, comprising:
[0007] First connector;
[0008] A first torsion spring is connected to the first connecting member;
[0009] The second torsion spring has a first break point at the first connecting member, and the second torsion spring can abut against the first connecting member.
[0010] The second connector has a second break point at the junction of the first torsion spring and the second connector, and the first torsion spring can abut against the second connector.
[0011] The third connector is connected to the third connector at the end of the second torsion spring that is away from the first connector.
[0012] The circuit board has a second connector at one end opposite to the first torsion spring connected to the circuit board, and a third connector at one end opposite to the second torsion spring connected to the circuit board.
[0013] In one embodiment of this utility model, a handle is included, and the handle is connected to the first connecting member.
[0014] In one embodiment of this utility model, a test button is also included, which abuts against the first torsion spring.
[0015] In one embodiment of this utility model, the first connecting member is an elastic body.
[0016] In one embodiment of this utility model, the second connecting member and the third connecting member are compression springs.
[0017] In one embodiment of this utility model, the circuit board covers the second connector and the third connector.
[0018] Secondly, this utility model provides a trip unit, including the aforementioned leakage current test detection circuit. The trip unit further includes a housing, and the first torsion spring and the second torsion spring are mounted on the outside of the housing. The first and second torsion springs utilize the elastic deformation characteristics of torsion springs and are mounted outside the housing of the trip unit, saving space within the housing, reducing the design space of the leakage current trip unit, and improving the dielectric performance of the leakage current test detection circuit.
[0019] In one embodiment of this utility model, the housing is provided with a groove, and the test button is installed in the groove of the housing.
[0020] In one embodiment of this utility model, the handle is rotatably connected to the housing.
[0021] In one embodiment of this utility model, the first connector, the second connector, the third connector, and the circuit board are all installed inside the housing.
[0022] Beneficial effects
[0023] The leakage current testing circuit provided by this utility model saves space inside the trip unit housing by placing the first and second torsion springs on the outside of the trip unit housing and utilizing the elastic deformation characteristics of the torsion springs. This achieves the goal of reducing the design space of the leakage current trip unit and improving the dielectric performance of the product. Furthermore, the leakage current testing circuit has two breakpoints: the connection between the first connector and the second torsion spring, and the connection between the first torsion spring and the second connector. When these two breakpoints are closed, a leakage current test signal is simulated. Once a leakage current is detected, the circuit can quickly and synchronously disconnect with the leakage current trip mechanism, effectively cutting off the power supply and preventing electrical accidents. Simultaneously, it avoids accidental operation by operators, has high stability and reliability, reduces maintenance costs, and extends the service life of the equipment. Attached Figure Description
[0024] Figure 1 This is a front view of the leakage current test detection circuit provided by this utility model;
[0025] Figure 2 Rear view of the leakage current test detection circuit provided by this utility model;
[0026] Figure 3 This is a front view of the test button in the untested state provided by this utility model;
[0027] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;
[0028] Figure 5 This is a front view of the test button in the test state provided by this utility model;
[0029] Figure 6 for Figure 3 A magnified view of a section at point B.
[0030] In the diagram: 1. Test button; 2. Handle; 3. First connector; 4. First torsion spring; 5. Second torsion spring; 6. Second connector; 7. Third connector; 8. Circuit board; 9. Housing; 100. Trip unit. Detailed Implementation
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0034] like Figures 1 to 6 As shown, this application provides a leakage current test detection circuit. This leakage current test detection circuit can simulate leakage current conditions and detect whether there is leakage current in the circuit by testing parameters such as current and voltage in the circuit. At the same time, it can also verify whether the working status of the leakage current protector is normal, ensuring that it can quickly cut off the power supply in the event of leakage current, thereby avoiding the occurrence of electrical accidents.
[0035] like Figure 1 and Figure 2As shown, in some embodiments, the leakage current test detection circuit includes a test button 1, a handle 2, a first connector 3, a first torsion spring 4, a second torsion spring 5, a second connector 6, a third connector 7, and a circuit board 8. The handle 2 is mounted on the trip unit and rotatably connected to it. Specifically, the two can be connected via a rotating shaft or bearing. The handle 2 is used to control the on / off state of the circuit. The first connector 3 is located on one side of the handle 2 and connected to it. Rotation of the handle 2 can drive the first connector 3 to rotate. The first connector 3 has a certain elasticity, used to assist in the reset of the handle 2 and the on / off state of the leakage current test detection circuit. The first torsion spring 4 is mounted on the outside of the housing 9 of the trip unit 100, with its end near the handle 2 connected to the first connector 3. The second torsion spring 5 is also mounted on the outside of the housing 9 of the trip unit 100, with its end near the handle 2 connected to the first connector 3. The first connector 3 has two endpoints; one endpoint is always connected to the first torsion spring 4, and the other endpoint can abut against the second torsion spring 5. When handle 2 is in the open state, the second torsion spring 5 is disconnected from the first connector 3, forming the first break point in the leakage current test detection circuit. When handle 2 is in the closed state, the second torsion spring 5 can abut against the first connector 3 and connect to the first torsion spring 4 through the first connector 3, forming a circuit. The first torsion spring 4 and the second torsion spring 5 utilize the elastic deformation characteristics of torsion springs and are installed outside the housing 9 of the trip unit 100, saving space inside the housing 9 of the trip unit 100, reducing the design space of the leakage current trip unit 100, and improving the dielectric performance of the leakage current test detection circuit.
[0036] In some embodiments, a slot is provided on the side of the housing 9 of the trip unit 100, and a test button 1 is installed in the slot. The test button 1 is connected to a first torsion spring 4, and the end of the first torsion spring 4 facing away from the first connecting member 3 can abut against a second connecting member 6. The second connecting member 6 is installed inside the trip unit 100, and the end of the second connecting member 6 facing away from the first torsion spring 4 is connected to the circuit board 8. When the test button 1 is not pressed, the first torsion spring 4 and the second connecting member 6 are in an open state, forming a second break point in the leakage current test detection circuit; when the test button 1 is pressed, the first torsion spring 4 moves to abut against the second connecting member 6, forming a circuit. By setting two break points to be closed, a leakage current test signal is simulated. Once a leakage current phenomenon is detected, the circuit can quickly disconnect synchronously with the leakage current tripping mechanism, thereby effectively cutting off the power supply and preventing electrical accidents; at the same time, it can also avoid accidental activation by operators, has high stability and reliability, reduces maintenance costs, and improves the service life of the equipment.
[0037] In some embodiments, the end of the second torsion spring 5 facing away from the first connector 3 is connected to the third connector 7. The third connector 7 is installed inside the trip unit 100, and the end of the third connector 7 facing away from the second torsion spring 5 is connected to the circuit board 8, forming a circuit. The circuit board 8 is installed inside the trip unit 100, covering the second connector 6 and the third connector 7, to realize the electrical control of the entire leakage current test detection circuit.
[0038] like Figures 3 to 4 As shown, in some embodiments, when handle 2 is closed, it rotates the first connector 3, causing the first connector 3 to abut against the second torsion spring 5, i.e., the first break point is connected, forming a circuit. The first connector 3 connects the first torsion spring 4 and the second torsion spring 5. The other end of the second torsion spring 5 is connected to the third connector 7, the third connector 7 is connected to the circuit board 8, and the circuit board 8 is connected to the second connector 6. However, since the test button 1 is in an untested state, the first torsion spring 4 and the second connector 6 are in an open state, i.e., the second break point is in an open circuit state. The leakage current test detection circuit cannot be connected, therefore, the test cannot be performed.
[0039] like Figures 5 to 6 As shown, in some embodiments, when handle 2 is closed, it rotates the first connector 3, causing the first connector 3 to abut against the second torsion spring 5, i.e., a first break point connection, forming a circuit. The first connector 3 connects the first torsion spring 4 and the second torsion spring 5. The other end of the second torsion spring 5 is connected to the third connector 7, the third connector 7 is connected to the circuit board 8, and the circuit board 8 is connected to the second connector 6. At this time, pressing the test button 1 puts it in the test state. Under the push of the test button 1, the first torsion spring 4 abuts against the second connector 6, i.e., a second break point connection, forming a circuit. The entire leakage current test detection circuit forms a circuit, enabling real-time monitoring and detection of leakage current in the equipment. When leakage current is detected, a protection action is triggered, automatically cutting off the power supply to protect the equipment and personal safety.
[0040] Optionally, the first connecting member 3 is an elastic body with a certain elastic force, which can assist the handle 2 in resetting. Preferably, the first connecting member 3 is a spring.
[0041] Optionally, the second connector 6 and the third connector 7 are compression springs installed inside the trip unit. They not only transmit current but also provide shock absorption and support, supporting the circuit board 8 and ensuring the stability and durability of the equipment operation.
[0042] Furthermore, this utility model also provides a trip unit 100, which includes the aforementioned leakage current test detection circuit. The handle 2, first connector 3, second connector 6, third connector 7, and circuit board 8 of the leakage current test detection circuit are installed inside the trip unit 100. The test button 1 is installed in a groove in the housing 9. The first torsion spring 4 and the second torsion spring 5, utilizing the elastic deformation characteristics of torsion springs, are installed outside the housing 9 of the trip unit 100, saving the space occupied by the leakage current test detection circuit within the housing of the trip unit 100, reducing the design space of the leakage current trip unit 100, and improving the dielectric performance of the trip unit 100. A double-break design is also adopted, with the connection between the first connector 3 and the second torsion spring 5 as the first break point and the connection between the first torsion spring 4 and the second connector 6 as the second break point. This avoids accidental activation by operators, provides high stability and reliability, reduces maintenance costs, and extends the service life of the equipment.
[0043] The working principle of this utility model is as follows: This leakage current test detection circuit has two breakpoints, located at the connection between the first connector 3 and the second torsion spring 5, and at the connection between the first torsion spring 4 and the second connector 6, respectively. When the handle 2 is in the open state, both the first and second breakpoints are open. When the handle 2 is rotated to the closed state, the handle 2 drives the first connector 3 to rotate, and the first connector 3 abuts against the second torsion spring 5, connecting the first breakpoint and forming a circuit. The first connector 3 connects the first torsion spring 4 and the second torsion spring 5. The other end of the second torsion spring 5 is connected to the third connector 7, the third connector 7 is connected to the circuit board 8, and the circuit board 8 is connected to the second connector 6. However, when the test button 1 is not pressed, because the second breakpoint is still in the open state, that is, the connection between the first torsion spring 4 and the second connector 6 is open, the entire leakage current test detection circuit is still in an open circuit state and cannot work. When the test button 1 is pressed, the test button 1 pushes the first torsion spring 4 to abut against the second connecting piece 6, so that the entire leakage test detection circuit is connected, and the leakage phenomenon of the equipment is monitored and detected in real time. When leakage current is detected, the protection action is triggered to automatically cut off the power supply to protect the equipment and personal safety.
[0044] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0045] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.
[0046] This document uses specific embodiments to illustrate the principles and implementation methods of this utility model. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. An electric leakage test detection circuit, characterized by comprising: Comprising: a first connecting piece (3); a first torsion spring (4) connected with the first connecting piece (3); a second torsion spring (5) with a first break point at the first connecting piece (3), and capable of abutting against the first connecting piece (3); a second connecting piece (6) with a second break point at the first torsion spring (4), and capable of abutting against the first torsion spring (4); a third connecting piece (7) connected with one end of the second torsion spring (5) away from the first connecting piece (3); a circuit board (8) connected with one end of the second connecting piece (6) away from the first torsion spring (4), and with one end of the third connecting piece (7) away from the second torsion spring (5).
2. The leakage test detection circuit according to claim 1, wherein, Comprising a handle (2) connected with the first connecting piece (3).
3. The leakage test detection circuit according to claim 1, wherein, Further comprising a test button (1) abutting against the first torsion spring (4).
4. The leakage test detection circuit according to claim 2, wherein, The first connecting piece (3) is an elastic body.
5. The leakage test detection circuit according to claim 1, wherein, The second connecting piece (6) and the third connecting piece (7) are compression springs.
6. The leakage test detection circuit according to claim 5, wherein, The circuit board (8) covers the second connecting piece (6) and the third connecting piece (7).
7. A trip unit characterized by, Comprising the leakage test detection circuit according to any one of claims 1-6, the release (100) further comprises a housing (9), and the first torsion spring (4) and the second torsion spring (5) are installed outside the housing (9).
8. A release according to claim 7, characterised in that The housing (9) is provided with a recess, and the test button (1) is installed in the recess of the housing (9).
9. A release according to claim 7, wherein The handle (2) is rotationally connected with the housing (9).
10. The trip unit of claim 7 wherein, The first connecting piece (3), the second connecting piece (6), the third connecting piece (7) and the circuit board (8) are all installed inside the housing (9).