Open type mutual inductor
Through the design of rail limit grooves and screw fixing combined with protective silicone, the problem of unstable cable position of the open transformer and aging of the plastic shell is solved, achieving higher measurement accuracy and longer service life.
Patent Information
- Application Number
- CN202422567399.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-10-23
AI Technical Summary
The measurement accuracy of existing open transformers decreases when the cable position is unstable, and the contact instability caused by the cable thermal expansion and contraction, affecting the measurement accuracy; the aging of the plastic shell, which shortens the life, and the oxidation of the iron core contact surface affects the measurement accuracy.
The design of rail limit grooves and screws are used to fix the cables through the limit parts to ensure the accurate position of the iron core, avoid aging of the plastic shell, increase the anti-oxidation capacity, and improve measurement accuracy and life.
Improves the stability and measurement accuracy of cable position, extends the service life of the transformer, enhances the anti-oxidation capacity, and ensures measurement accuracy.
Smart Images
Figure CN223296614U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of current sensors, in particular to an open-type mutual inductor. Background Art
[0002] Open-type transformers are used for low-voltage 220V current measurement and have the advantage of being directly fixed without removing copper busbars or cables. More and more open-type transformers are used on installed distribution cabinets, which is particularly convenient for on-site installation without power outages.
[0003] In the existing technology, open-type current transformers are usually directly nested on the surface of the cable for measurement. Due to the unstable cable position, the accuracy of the sensor measurement may be reduced, especially when measuring small currents. Any error caused by the unstable cable position may be amplified, which may cause greater leakage magnetic field in the magnetic ring of the sensor, reducing the magnetic field gathering capacity in the magnetic ring, thereby reducing the measurement accuracy. At the same time, due to thermal expansion and contraction of the cable, the contact between the contact point of the sensor and the cable may become unstable, thereby affecting the accuracy of the sensor. Utility Model Content
[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose an open type mutual inductor.
[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an open-type transformer, comprising an upper part and a lower part of the transformer, the interface ends of the upper part and the lower part of the transformer are both provided with an iron core, and mounting parts are fixed at both ends of the top of the upper part of the transformer, the mounting parts are composed of two symmetrical guide rails, and the side walls of the guide rails are arranged with limiting grooves in an array, and the limiting parts are embedded in the mounting parts, and both sides of the limiting parts are provided with clamping feet, and the clamping feet are made of elastic material.
[0006] The upper interface end and the lower interface end of the transformer are both fixed with fixing parts, and screw holes are opened in the middle of the fixing parts, and the adjacent fixing parts are fixed with bolts. The existing open transformer is simple to install and usually adopts a snap-fit method. Due to the stress and aging of the plastic shell, the life of the transformer is shortened, and the misalignment of the iron core contact surface during installation causes long-term exposure to the air and oxidation. The life of an ordinary transformer is required to be more than 15 years, while the life and mean failure-free time of an open-type transformer are half of that of an ordinary transformer. In addition, since the iron core contact area may be moved, the accuracy of the transformer measurement does not meet the requirements, and the installed open-type transformer cannot be simply confirmed whether it is caused by installation. To address this problem, the utility model adopts screw fixing on both sides of the transformer. The screw fixing has less deformation stress, which effectively avoids the shortening of the transformer life caused by aging of the plastic fixing buckle of the shell, and the screw fixing makes the iron core position relatively accurate, thereby improving the accuracy of the transformer measurement.
[0007] Protective silicone is provided at the interface ends of the upper and lower parts of the transformer. Protective silicone is added at the fixed end to ensure the contact between the two core end faces and isolate the end faces from the air, thereby improving the anti-oxidation ability and the life of the transformer.
[0008] The surface of the limit groove is smoothed, and the contact end between the clamping foot and the limit groove is set to an arc surface. In order to further improve the flexibility of the limit piece, the surface of the limit groove is smoothed, and the contact end between the clamping foot and the limit groove is set to an arc surface, so that the limit piece can move more sensitively when the cable expands and contracts due to heat.
[0009] One end of the limiter is set as a paddle. The design of the paddle is to make it easier and faster for the staff to move or adjust the position of the limiter when they need to, so that the user can be more stable during operation and maintain good friction even when there is sweat or oil on the hands, thereby avoiding slipping.
[0010] An arc groove is provided at the other end of the limiter, which enables the mutual inductor to measure cables with a smaller radius, provides a more stable limit on the cables, and improves the measurement accuracy of small cables.
[0011] Beneficial effects
[0012] 1. In the prior art, open-type current transformers are usually directly nested on the surface of the cable for measurement. Due to the unstable cable position, the accuracy of the sensor measurement may be reduced. Especially in small current measurements, any error caused by the unstable cable position may be amplified, which may cause greater leakage magnetic field in the magnetic ring of the sensor, reduce the magnetic field gathering capacity in the magnetic ring, and thus reduce the measurement accuracy. At the same time, due to the thermal expansion and contraction of the cable, the contact between the contact point of the sensor and the cable may become unstable, thereby affecting the accuracy of the sensor. To address such problems, the utility model adopts a guide groove snap-on fixing method that is perpendicular to the opening direction, and fixes both sides of the cable by a limiter. This is not only convenient for installation, but also improves the stability of the cable. At the same time, when the cable expands and contracts, the limiter adjusts its position automatically under pressure, avoiding the influence of the thermal expansion and contraction of the cable on the expansion of the opening, thereby improving the accuracy of the measuring transformer.
[0013] 2. The existing open-type transformer is simple to install and usually adopts a snap-fit method. Due to the stress and aging of the plastic shell, the life of the transformer is shortened, and the contact surface of the core is misaligned during installation, resulting in long-term exposure to the air and oxidation. The life of an ordinary transformer is required to be more than 15 years, while the life and mean time between failures of the open-type transformer are half of that of an ordinary transformer. In addition, since the contact area of the core may be moved, the accuracy of the transformer measurement does not meet the requirements, and it is impossible to simply confirm whether the installed open-type transformer is caused by the installation. To address such problems, the utility model adopts screw fixing on both sides of the transformer. The screw fixing has less deformation stress, which effectively avoids the shortening of the transformer life caused by aging of the plastic fixing buckle of the shell, and the screw fixing makes the core position relatively accurate, thereby improving the accuracy of the transformer measurement. At the same time, protective silicone is added to the fixed end to ensure the contact between the two core end faces and isolate the end faces from the air, thereby improving the antioxidant ability and the life of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;
[0015] Figure 2 This is a schematic diagram of the three-dimensional structure of the mounting member of the present utility model;
[0016] Figure 3 This is a schematic diagram of the three-dimensional structure of the fixing member of the present utility model;
[0017] Figure 4 It is a schematic diagram of the three-dimensional structure of the limiting member in the utility model.
[0018] Legend:
[0019] 1. Upper part of the transformer; 2. Lower part of the transformer; 3. Mounting part; 301. Limiting groove; 4. Limiting part; 401. Arc groove; 402. Clamping foot; 403. Pick; 5. Fixing part. DETAILED DESCRIPTION
[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments and drawings. However, the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the implementation manner, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.
[0021] The specific embodiments of the present utility model are described below with reference to the accompanying drawings. Specific embodiment:
[0023] Reference Figure 1-4The open-type transformer includes an upper transformer part 1 and a lower transformer part 2. The interface ends of the upper transformer part 1 and the lower transformer part 2 are both provided with iron cores. The interface ends of the upper transformer part 1 and the lower transformer part 2 are provided with protective silicone. Adding protective silicone at the fixed end ensures the contact between the two iron core end faces and isolates the end faces from contact with the air, thereby improving the antioxidant capacity and the life of the transformer. Mounting parts 3 are fixed at both ends of the top of the upper transformer part 1. The mounting parts 3 are composed of two symmetrical guide rails. The side walls of the guide rails are arrayed with limit slots 301. The mounting parts 3 are embedded in the mounting parts 3. Both sides of the limit members 4 are provided with clamping feet 402, and the clamping feet 402 are made of elastic material.
[0024] The upper interface end 1 of the transformer and the lower interface end 2 of the transformer are both fixed with fixing parts 5, and screw holes are opened in the middle of the fixing parts 5, and the adjacent fixing parts 5 are fixed with bolts. The existing open transformer is simple to install and usually adopts a snap-fit method. Due to the stress and aging of the plastic shell, the life of the transformer is shortened, and the contact surface of the core is misaligned during installation, resulting in oxidation after long-term exposure to the air due to aging or evaporation of the protective oil. The life of the epoxy resin cast non-open transformer of the ordinary transformer is required to be more than 15 years, while the life and mean failure-free time of the open transformer are half of that of the ordinary transformer. In addition, since the contact area of the core may be moved, the accuracy of the transformer measurement does not meet the requirements, and the installed open transformer cannot be simply confirmed whether it is caused by installation. To address this problem, the utility model adopts screw fixing on both sides of the transformer. The screw fixing has less deformation stress, which effectively avoids the shortening of the transformer life caused by aging of the plastic fixing buckle of the shell, and the screw fixing makes the core position relatively accurate, thereby improving the accuracy of the transformer measurement.
[0025] The surface of the limit groove 301 is smoothed, and the contact end of the clamping foot 402 with the limit groove 301 is set as an arc surface. In order to further improve the flexibility of the limit member 4, the surface of the limit groove 301 is smoothed, and the contact end of the clamping foot 402 with the limit groove 301 is set as an arc surface, so that the limit member 4 can move more sensitively when the cable expands and contracts with heat. One end of the limit member 4 is set as a paddle 403. The design of the paddle 403 is to facilitate the staff to move or adjust the position of the limit member 4 more easily and quickly when it is needed, so that the user can operate more steadily and maintain good friction even when there is sweat or oil on the hands, thereby preventing slipping. The other end of the limit member 4 is provided with an arc groove. The arc groove enables the mutual inductor to measure cables with a smaller radius, and to limit them more stably, thereby improving the measurement accuracy of small cables.
[0026] The working principle of the present invention is as follows: open the lower part 2 of the transformer, put the lower part 2 of the transformer and the upper part 2 of the transformer around the cable, and make the iron core end faces of the lower part 2 of the transformer and the upper part 2 of the transformer contact, fix the fixing part 5 by bolts, then pull open the paddle 403, adjust the position of the limiter 4 to clamp the cable, and perform measurement.
[0027] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0028] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.
Claims
1. An open-type transformer, comprising a transformer upper part (1) and a transformer lower part (2), wherein the interface ends of the transformer upper part (1) and the transformer lower part (2) are both provided with an iron core, characterized in that: Mounting members (3) are fixed at both ends of the top of the upper part (1) of the mutual inductor. The mounting member (3) is composed of two symmetrical guide rails. The side walls of the guide rails are provided with limiting grooves (301) in an array. A limiting member (4) is embedded in the mounting member (3). Both sides of the limiting member (4) are provided with clamping feet (402), and the clamping feet (402) are made of elastic material.
2. The open-type mutual inductor according to claim 1, characterized in that: The upper (1) interface end of the mutual inductor and the lower (2) interface end of the mutual inductor are both fixed with fixing members (5), and screw holes are provided in the middle of the fixing members (5), and adjacent fixing members (5) are fixed with bolts.
3. The open-type mutual inductor according to claim 2, characterized in that: Protective silica gel is provided at the interface end between the upper part (1) of the mutual inductor and the lower part (2) of the mutual inductor.
4. The open-type mutual inductor according to claim 1, characterized in that: The surface of the limiting groove (301) is smoothed, and the contact end between the clamping foot (402) and the limiting groove (301) is configured as an arc surface.
5. The open-type mutual inductor according to claim 1, characterized in that: One end of the limiting member (4) is configured as a paddle (403).
6. The open-type mutual inductor according to claim 1, characterized in that: The other end of the limiting member (4) is provided with an arc-shaped groove (401).