A passive non-contact DC current detection device
By using a passive, non-contact DC current detection device, which utilizes a flat cylindrical magnet and a spring to detect current, the limitations of the testing environment and power supply issues of clamp-on ammeters are solved, enabling contactless current detection and concealed wire location.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-07-25
- Publication Date
- 2026-03-10
AI Technical Summary
In the maintenance of existing DC cables, clamp-on ammeters face challenges such as limited testing environment, high cost, and the need for power supply.
Design a passive, non-contact DC current detection device, including a transparent shell, a flat cylindrical magnet and a spring. The device uses Ampere's law to detect current and determines the presence of current by observing the magnet's rotation. The device does not require contact with cables.
It enables current detection without power supply in complex environments, reducing costs and allowing detection of DC wires in concealed locations.
Smart Images
Figure CN115060960B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of current detection technology, and in particular to a passive non-contact DC current detection device. Background Technology
[0002] For the maintenance of DC cables or DC equipment, in most cases, maintenance personnel only need to determine whether current is flowing through the cable to proceed to the next step. Currently, the vast majority of methods for determining the presence of current in a cable involve clamping a DC clamp meter onto the cable under test. While this method is reliable, in environments with dense cable distribution or limited space, clamp meters often lack sufficient room to operate. Furthermore, clamp meters are relatively expensive, inconvenient to carry, and their battery power is limited by its operating time. Summary of the Invention
[0003] This application provides a passive, non-contact DC current detection device to solve the problems of limited testing environment, high cost, and the need for power supply for clamp-on ammeters in current testing methods using test cables.
[0004] This application provides a passive non-contact DC current detection device, comprising: a transparent shell, a flat cylindrical magnet, and springs; the flat cylindrical magnet is horizontally placed at the center of the transparent shell; the number of springs is 6; wherein 4 of the springs are evenly pulled towards the inner wall of the transparent shell in the horizontal direction of the flat cylindrical magnet, and 2 of the springs are evenly pulled towards the inner wall of the transparent shell in the vertical direction of the center of the flat cylindrical magnet; the transparent shell is marked with a reference line for the direction of the detection cable; the reference line for the direction of the detection cable is perpendicular to the plane where the flat cylindrical magnet is located.
[0005] Optionally, the transparent outer shell is specifically a spherical shell.
[0006] Optionally, a magnet flipping indicator is attached directly below the flat cylindrical magnet.
[0007] Optionally, the magnet flip indicator is coated with fluorescent powder.
[0008] Optionally, the transparent outer shell is uniformly engraved with magnet flip angle scale marks; the plane on which the magnet flip angle scale marks are located is parallel to the flat cylindrical magnet.
[0009] Optionally, the flat cylindrical magnet is made of rubidium.
[0010] Optionally, the spring is made of copper.
[0011] Optionally, the transparent outer shell is made of an insulating material.
[0012] Optionally, the spring is a cylindrical compression spring.
[0013] Optionally, an extension auxiliary insulating rod interface is provided at the intersection point of the detection cable direction reference line and the plane where the flat cylindrical magnet is located; the extension auxiliary insulating rod interface has a threaded structure.
[0014] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:
[0015] This application provides a passive non-contact DC current detection device, comprising: a transparent shell, a flat cylindrical magnet, and springs; the flat cylindrical magnet is horizontally placed at the center of the transparent shell; the number of springs is 6; wherein 4 of the springs are evenly pulled towards the inner wall of the transparent shell in the horizontal direction of the flat cylindrical magnet, and 2 of the springs are evenly pulled towards the inner wall of the transparent shell in the vertical direction of the center of the flat cylindrical magnet; the transparent shell is marked with a reference line for the direction of the detection cable; the reference line for the direction of the detection cable is perpendicular to the plane where the flat cylindrical magnet is located.
[0016] By housing a flat cylindrical magnet and a spring within a transparent casing, when inspecting the cable under test, simply bring the device as close to the cable as possible and observe the rotation of the flat cylindrical magnet to determine whether current is flowing through the cable. This overcomes the shortcomings of traditional testing methods using clamp-on ammeters, such as the limited testing environment, high cost, and need for a power supply.
[0017] In addition to detecting cables, the device can also detect modules through which DC current flows, such as fuses. It can also pinpoint the approximate location of DC wires buried in walls. Attached Figure Description
[0018] Figure 1 This is an internal structural diagram of a passive non-contact DC current detection device provided in the embodiments of this application;
[0019] Figure 2 This is a schematic diagram of the appearance of a passive non-contact DC current detection device provided in the embodiments of this application;
[0020] Figure 3 This refers to the extended auxiliary insulating rod carried by a passive non-contact DC current detection device provided in the embodiments of this application;
[0021] Figure 4 The principle of the detection process of a passive non-contact DC current detection device provided in the embodiments of this application. Figure 1 ;
[0022] Figure 5The principle of the detection process of a passive non-contact DC current detection device provided in the embodiments of this application. Figure 2 ;
[0023] Figure 6 The principle of a passive non-contact DC current detection device provided in the embodiments of this application is as follows. Figure 1 ;
[0024] Figure 7 The principle of a passive non-contact DC current detection device provided in the embodiments of this application is as follows. Figure 2 .
[0025] in:
[0026] 1 is a transparent outer shell, 2 is a flat cylindrical magnet, 3 is a spring, 4 is a magnet flip indicator, 5 is a reference line for the direction of the detection cable, 6 is a scale mark for the magnet flip angle, 7 is an extension auxiliary insulating rod interface, and 8 is an extension auxiliary insulating rod. Detailed Implementation
[0027] This application provides a passive non-contact DC current detection device to solve the problems of limited testing environment, high price, and the need for power supply for clamp-on ammeter test cables in current testing methods.
[0028] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.
[0029] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0030] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0031] Please see Figure 1 and Figure 2 , Figure 1 This is an internal structural diagram of a passive non-contact DC current detection device provided in the embodiments of this application. Figure 2 This is a schematic diagram of the external appearance of a passive non-contact DC current detection device provided in an embodiment of this application. The internal structure of this passive non-contact DC current detection device includes: a transparent outer shell 1, a flat cylindrical magnet 2, and springs 3; the flat cylindrical magnet 2 is horizontally placed at the center of the transparent outer shell 1; the number of springs 3 is 6; four of the springs 3 are evenly pulled towards the inner wall of the transparent outer shell 1 in the horizontal direction of the flat cylindrical magnet 2, and two of the springs 3 are evenly pulled towards the inner wall of the transparent outer shell 1 in the vertical direction of the center of the flat cylindrical magnet 2; the transparent outer shell 1 is marked with a reference line 5 for the direction of the detection cable; the reference line 5 for the direction of the detection cable is perpendicular to the plane where the flat cylindrical magnet 2 is located.
[0032] In this embodiment of the invention, a flat cylindrical magnet 2 and a spring 3 are disposed in the transparent outer shell 1. The flat cylindrical magnet 2 is pulled by springs 3 on all four sides in the horizontal direction, and two springs 3 are pulled at the center position of the flat cylindrical magnet 2 perpendicular to its horizontal plane, thereby fixing the flat cylindrical magnet 2 in the transparent outer shell 1.
[0033] In an alternative embodiment, the transparent outer shell 1 is specifically a circular spherical shell.
[0034] In one alternative embodiment, the surface of the transparent shell is coated with fluorescent powder.
[0035] In this embodiment of the invention, the transparent outer shell 1 is a circular spherical shell.
[0036] In an alternative embodiment, a magnet flipping indicator 4 is attached directly below the flat cylindrical magnet 2.
[0037] In this embodiment of the invention, the magnet flip indicator 4 allows users to more intuitively observe the angle of magnet flipping.
[0038] To facilitate observation in dim environments, in one alternative embodiment, the magnet flip indicator 4 is covered with fluorescent powder.
[0039] In one optional embodiment, the transparent outer shell 1 is uniformly engraved with magnet flip angle scale marks 6; the plane on which the magnet flip angle scale marks 6 are located is parallel to the flat cylindrical magnet.
[0040] In this embodiment of the invention, the magnet flip angle scale 6 is used to estimate the magnitude of the current in the cable under test. The larger the scale indicated by the flip indicator, the larger the flip angle of the flat cylindrical magnet 2, and the greater the force that the flat cylindrical magnet 2 overcomes the spring tension. Therefore, the magnetic field of the cable under test is also greater, thus leading to the conclusion that the current in the cable is greater.
[0041] In one alternative embodiment, the flat cylindrical magnet 2 is made of rubidium.
[0042] In this embodiment of the invention, the flat cylindrical magnet 2 is made of rubidium, and its magnetic poles are located at the top and bottom respectively.
[0043] In one alternative embodiment, the spring 3 is specifically made of copper.
[0044] In this embodiment of the invention, in order to fix the flat cylindrical magnet 2 and allow it to return to its initial position without the influence of other magnetic fields, a copper spring is used as an important component of this embodiment of the invention.
[0045] In an alternative embodiment, the transparent outer shell 1 is made of an insulating material.
[0046] In this embodiment of the invention, in order to ensure the safety of the user during the use of this device, the transparent shell 1 is made of insulating material.
[0047] In an alternative embodiment, the spring 3 is a cylindrical compression spring.
[0048] In an optional embodiment, an extension auxiliary insulating rod interface 7 is provided at the intersection of the plane where the detection cable direction reference line 5 and the flat cylindrical magnet 2 are located; the extension auxiliary insulating rod interface is a threaded structure.
[0049] Please see Figure 3 , Figure 3 The extended auxiliary insulating rod carried by the passive non-contact DC current detection device provided in this application embodiment has a threaded interface 7 that can be connected to the extended auxiliary insulating rod 8. This allows for the detection of more concealed cables in complex field environments using the extended auxiliary insulating rod 8.
[0050] In a preferred embodiment, the extended auxiliary insulating rod 8 has a telescopic function, which can be adapted to more complex field environments.
[0051] Please refer to Figure 4 The principle of the detection process of a passive non-contact DC current detection device provided in the embodiments of this application. Figure 1 , Figure 5 The principle of the detection process of a passive non-contact DC current detection device provided in the embodiments of this application. Figure 2 First, align the cable direction reference line of the device with the cable under test and move it close to the cable, ideally even touching it. Then, observe the position of the magnet's indicator. If it remains stationary at the "0" mark, no current is flowing through the cable. If the indicator moves beyond the "0" mark, current is flowing through the cable. By observing the corresponding reading on the indicator, the magnitude of the current in the cable can be determined.
[0052] Please see Figure 6 and Figure 7 , Figure 6 The principle of a passive non-contact DC current detection device provided in the embodiments of this application is as follows. Figure 1 , Figure 7 The principle of a passive non-contact DC current detection device provided in the embodiments of this application is as follows. Figure 2 In terms of the principle of the device, this invention actually utilizes Ampere's law: Assuming there is a DC cable perpendicular to the ground, when current flows upward through it, a magnetic field will be generated around the cable. According to Ampere's law, the direction of this magnetic field is as follows... Figure 6 As shown by the magnetic field lines, there is then a horizontally placed flat neodymium magnet, as... Figure 7 As shown, if its N pole points upward and its S pole points downward, then its magnetic field direction is as follows: Figure 6 The magnetic field lines are shown. When the magnet moves closer to the wire, because the magnetic field lines of the wire and the magnet are not aligned, assuming the wire is fixed, the magnet will flip, resulting in a flip angle 'a'. Without any other external force, the magnet will flip until its magnetic field lines align with those of the wire. At this point, the magnet will be parallel to the wire and perpendicular to the ground.
[0053] The passive non-contact DC current detection device provided by this invention includes: a transparent shell 1, a flat cylindrical magnet 2, and springs 3; the flat cylindrical magnet 2 is horizontally placed at the center of the transparent shell 1; the number of springs 3 is 6; four of the springs 3 are evenly pulled towards the inner wall of the transparent shell 1 in the horizontal direction of the flat cylindrical magnet 2, and two of the springs 3 are evenly pulled towards the inner wall of the transparent shell 1 in the vertical direction of the center of the flat cylindrical magnet 2; the transparent shell 1 is marked with a detection cable direction reference line 5; the detection cable direction reference line 5 is perpendicular to the plane where the flat cylindrical magnet 2 is located.
[0054] By mounting a flat cylindrical magnet 2 and a spring 3 within a transparent housing 1, when inspecting the cable under test, simply bring the device as close to the cable as possible and observe the rotation of the flat cylindrical magnet 2 to determine whether current flows through the cable. This solves the problems of traditional testing methods using clamp-on ammeters, such as the limited testing environment, high cost, and need for power supply.
[0055] In addition to detecting cables, the device can also detect modules through which DC current flows, such as fuses. It can also pinpoint the approximate location of DC wires buried in walls.
[0056] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A passive non-contact DC current detection device, characterized by, The utility model relates to a transparent shell, flat cylinder magnet and spring, the flat cylinder magnet is placed in the positive center position of the transparent shell horizontally, the number of spring is 6, wherein 4 springs are evenly pulled to the inner wall of the transparent shell in the horizontal direction of the flat cylinder magnet, and two springs are evenly pulled to the inner wall of the transparent shell in the vertical direction of the center of the flat cylinder magnet, the transparent shell is marked with detection cable direction reference line, the detection cable direction reference line is perpendicular to the plane where the flat cylinder magnet is located, the transparent shell is evenly engraved with magnet overturning angle scale mark, the plane where the magnet overturning angle scale mark is located is parallel with the flat cylinder magnet, the intersection point of the detection cable direction reference line and the plane where the flat cylinder magnet is located is provided with extension auxiliary insulating rod interface, and the extension auxiliary insulating rod interface is screw thread structure. The transparent shell is specifically circular spherical shell. The lower side of the flat cylinder magnet is closely attached with magnet overturning indication mark. The magnet overturning indication mark is covered with fluorescent powder. The material of the flat cylinder magnet is rubidium.
2. The passive non-contact DC current sensing device of claim 1, wherein, The material of the spring is specifically copper.
3. The passive non-contact DC current sensing device of claim 1, wherein, The transparent shell is made of insulating material.
4. The passive non-contact DC current sensing device of claim 3, wherein, The spring is cylindrical compression spring.
5. The passive non-contact DC current sensing device of claim 1, wherein, 6. The passive non-contact DC current sensing device of claim 1, wherein, 7. The passive non-contact DC current sensing device of claim 1, wherein, 8. The passive non-contact DC current sensing device of claim 1, wherein,