Inductor with thermal broken wire for voltage sag

Abstract

The utility model provides an inductor with thermal breaking wires for voltage sag, which belongs to the technical field of voltage sag, and comprises an inductor, the inductor comprises a main body, the main body comprises an iron core and a coil, the coil comprises a plurality of layers, a plurality of strip-shaped rigid insulating parts are arranged between the layers, and the strip-shaped rigid insulating parts are arranged between the iron core and the coil. The two sides, making contact with the coil, of the strip-shaped rigid insulating part are provided with raised grains matched with copper wires of the coil in the direction perpendicular to the winding direction of the coil, and an airflow channel is formed. The inductor is respectively provided with an inlet wire and an outlet wire, a thermal breaker is arranged at the inlet wire position, the thermal breaker comprises an insulating tube body and an end cap, the thermal breaker convenient to replace is arranged at the inlet wire end of the inductor, maintenance time and cost can be reduced, and meanwhile, the service life of the inductor is prolonged. The thermal breaker of the plug-in structure can be replaced according to different current, voltage or temperature requirements.

Description

Technical Field

[0001] The utility model belongs to the technical field of voltage sag, and in particular relates to an inductor with a thermal fuse used for voltage sag. Background Art

[0002] Voltage sag is a power quality problem, usually a phenomenon in which the voltage in the power system drops in a short period of time. This drop can be instantaneous or last longer, but within two weeks. Voltage sag is usually caused by faults in the power system, motor starting, short circuits, etc., which may cause the voltage of the power grid to drop momentarily, which may cause equipment failure or problems in industrial production. Inductors are commonly used in power equipment. For voltage sags, they are prone to overheating and instability. Utility Model Content

[0003] In view of this, the utility model provides an inductor with a thermal fuse for voltage sag, so as to solve the problem of reducing the damage of the inductor caused by voltage sag in the occasion of unstable power quality.

[0004] The utility model is achieved in this way:

[0005] The utility model provides an inductor with a thermal cutoff for voltage sag, comprising an inductor, wherein the inductor is connected with an input line and an output line, the inductor comprises a main body, the main body comprises an iron core and a coil, the coil comprises multiple layers, a plurality of strip-shaped rigid insulating members are arranged between each layer, and the strip-shaped rigid insulating members are perpendicular to the winding direction of the coil, and both sides of the strip-shaped rigid insulating members contacting the coil have wavy patterns of copper wires matching the coil to form an airflow channel; the input line is provided with a thermal cutoff, the thermal cutoff comprises an insulating tube body and two end caps made of metal material, metal sheets are arranged at the connection between the two end caps and the insulating tube body, a fuse is arranged in the insulating tube body, and the two ends of the fuse are respectively connected to the two metal sheets.

[0006] The technical effects of an inductor with a thermal cutout for voltage sag provided by the utility model are as follows: the use of an air layer channel can effectively improve heat dissipation and prevent various faults caused by overheating due to voltage sag; in addition, during the voltage sag, when the voltage suddenly drops, a current increase will occur synchronously. This current increase causes the heat generation of the thermal breaker to increase. When the heat generation increases to a certain extent, the thermal breaker will blow. The thermal breaker after blowing can effectively protect the inductor from being damaged by the voltage sag. By providing a thermal breaker that is easy to replace at the line input end of the inductor, it is convenient to measure the current. If the thermal breaker triggers the fuse, for example, due to current overload or overheating, the user can relatively easily remove the original thermal breaker and then insert a new thermal breaker, which can reduce the time and cost of maintenance and repair.

[0007] On the basis of the above technical solution, the inductor with thermal fuse for voltage sag of the utility model can also be improved as follows:

[0008] The beneficial effect of adopting the above-mentioned improvement scheme is that by matching the metal sheet with the end cap, a protection mechanism can be realized. When the temperature of the thermal breaker rises to the melting point, the metal sheet will melt first and disconnect the circuit. The end cap not only provides additional safety, but also enhances the mechanical stability of the metal sheet. It can help fix the metal sheet and prevent it from moving or loosening under vibration or mechanical shock. This helps to ensure that the thermal breaker maintains its integrity under normal working conditions.

[0009] Furthermore, the metal sheet is fixedly connected to the insulating tube body.

[0010] The beneficial effect of adopting the above-mentioned improvement scheme is that the presence of the insulating tube body provides insulation protection for the metal sheet. Because under normal working conditions, the metal sheet needs to be isolated from other circuit parts to prevent short circuits or other electrical problems. The insulating tube body ensures that the current can only flow inside the metal sheet and will not affect other parts. The insulating tube body can also protect the metal sheet from the influence of the external environment, such as dust, moisture and chemicals. This helps to extend the life of the thermal breaker and ensure that it can work reliably under various conditions.

[0011] Furthermore, the end cap and the metal sheet are fixed via a snap-fit ​​connection structure or a sliding connection structure.

[0012] The beneficial effect of adopting the above-mentioned improvement scheme is that the thermal breakers of the movable connection structure can be replaced according to different current, voltage or temperature requirements. This makes them suitable for various applications, from small electronic devices to large power systems.

[0013] Furthermore, the end cap is provided with a groove, and the metal sheet is provided with a protrusion in a matching manner, the protrusion matches the groove, and the protrusion is used to fix the metal sheet to the end cap.

[0014] The beneficial effect of adopting the above-mentioned improvement scheme is that by matching the protrusion of the metal sheet with the groove of the end cap, the metal sheet can be firmly fixed on the end cap, which helps to prevent the metal sheet from moving or falling off under the action of vibration or other external forces, thereby ensuring the reliability of the thermal breaker device.

[0015] Furthermore, the insulating tube body is in the shape of a cylindrical tube.

[0016] Furthermore, the metal sheet matches with two ends of the insulating tube body, the metal sheet is circular, and the radius of the circle is equal to the radius of the cylindrical tube.

[0017] The beneficial effect of adopting the above-mentioned improvement scheme is that when the radius of the metal sheet matches the radius of the insulating tube body, a tight seal can be achieved, which helps to prevent dust, moisture or other pollutants in the external environment from entering the insulating tube body, thereby improving the reliability and life of the thermal breaker device.

[0018] Furthermore, two ends of the fuse are fixedly connected to the two metal sheets.

[0019] The beneficial effect of adopting the above improved solution is that the fuse is fixedly connected to the two metal sheets to ensure the connectivity of the current path. When the current passes through the thermal breaker, this connection ensures that the current can smoothly pass through the metal sheets and the fuse to achieve the function of the thermal breaker.

[0020] Furthermore, the metal sheet and the metal cap are both made of metal materials with good electrical conductivity; preferably, the metal sheet is made of a low melting point metal material.

[0021] This metal piece is conductive under normal operating conditions, but when the temperature rises to the melting temperature, the metal piece will melt, causing an open circuit and cutting off the circuit.

[0022] Compared with the prior art, the utility model provides an inductor with a thermal fuse for voltage sag, which has the following beneficial effects:

[0023] 1: Replaceability: The plug-in structure allows the thermal breaker to be easily replaced. If the thermal breaker triggers a fuse, such as due to current overload or overheating, the user can relatively easily remove the original thermal breaker and insert a new one, which can reduce the time and cost of maintenance and repair;

[0024] 2: Stability: Since the inductor uses a breathable layer, it can facilitate heat dissipation and avoid thermal failures. It has a good heat dissipation effect when voltage sags occur frequently and cause overheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 A schematic diagram of an inductor with a thermal fuse for voltage sag;

[0027] Figure 2 A schematic diagram of an inductor fuse with a thermal fuse for voltage sag;

[0028] Figure 3 It is a schematic diagram of an inductor clamping structure with a thermal fuse for voltage sag;

[0029] Figure 4 A schematic diagram of a sliding connection of an inductor with a thermal fuse for voltage sag;

[0030] Figure 5 An example diagram of the interior of an inductor with a thermal fuse for voltage sag;

[0031] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0032] 10. Inductor; 20. Incoming wire; 30. Outgoing wire; 40. Thermal breaker; 41. Metal sheet; 42. Fuse; 43. Insulating tube; 44. End cap. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the implementation mode of the present invention clearer, the technical solution in the implementation mode of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the implementation mode of the present invention.

[0034] like Figure 1 , Figure 2 , Figure 5As shown, an embodiment of an inductor with a thermal cutoff for voltage sag provided by the utility model is shown. In this embodiment, the inductor 10 is included, wherein the inductor 10 is connected with an input line 20 and an output line 30, and the inductor 10 includes a main body, the main body includes an iron core and a coil, the coil includes multiple layers, and multiple strip-shaped rigid insulating members are provided between each layer, perpendicular to the winding direction of the coil, and the two sides of the strip-shaped rigid insulating members in contact with the coil have wavy patterns of copper wires matching the coil to form an air flow channel; wherein the input line 20 is provided with a thermal breaker 40, and the thermal breaker 40 includes an insulating tube body 43 and two end caps 44 made of metal material, and a metal sheet 41 is provided at the connection between the two end caps 44 and the insulating tube body 43, and a fuse 42 is provided in the insulating tube body 43, and the two ends of the fuse 42 are respectively connected to the two metal sheets 41.

[0035] Preferably, the above solution achieves good heat dissipation and prevents damage to the device caused by excessive current caused by voltage sag.

[0036] Preferably, the strip-shaped rigid member can be in the form of a long column, such as a polygonal column, wherein at least one side of the side wall has a wave pattern, and each arc of the wave pattern is short and shallow, so as to cooperate with the copper wire clamping and positioning.

[0037] Furthermore, in the above technical solution, the metal sheet 41 is fixedly connected to the insulating tube body 43 .

[0038] like Figure 3 As shown, further, in the above technical solution, the end cap 44 and the metal sheet 41 are fixed by a snap-fit ​​connection structure.

[0039] Further, in the above technical solution, the end cap 44 is provided with a slot, and the metal sheet 41 is provided with a protrusion, which matches the slot and is used to fix the metal sheet 41 to the end cap 44. It can be fixed by gap or dovetail slot type plug-in fixation.

[0040] Furthermore, in the above technical solution, the insulating tube body 43 is in the shape of a cylindrical tube.

[0041] The cylindrical shape of the thermal cutout device has a uniform geometry, which results in relatively uniform heating distribution. This helps ensure that all parts of the thermal cutout are subject to similar current density and heat, thus avoiding local overheating when melting.

[0042] Furthermore, in the above technical solution, the metal sheet 41 matches with both ends of the insulating tube body 43, and the metal sheet 41 is circular, and the radius of the circle is equal to the radius of the cylindrical tube.

[0043] Furthermore, in the above technical solution, both ends of the fuse 42 are fixedly connected to the two metal sheets 41 .

[0044] Furthermore, in the above technical solution, the metal sheet 41 is made of a low-melting-point metal material, and the low-melting-point metal material includes lead, tin, etc. Specifically, lead: melting point 328; tin: melting point 232.

[0045] The voltage of the voltage sag can vary from a few hundred volts to tens of kilovolts for different electrical components and applications. Under normal conditions, such as room temperature and pressure, the breakdown voltage of lead can be between several thousand volts and tens of kilovolts. The breakdown voltage depends on the purity of the lead, the temperature, and the shape of the material. The breakdown voltage of tin can be between hundreds of volts and thousands of volts. The breakdown voltage of tin is low because its electronic structure and material properties make it relatively easy to conduct electricity.

[0046] like Figure 4 As shown, further, in the above technical solution, such an embodiment can also be adopted, that is, the end cap 44 and the metal sheet 41 are fixed by a sliding connection structure.

[0047] In another embodiment, the inductor input line 20 is provided with a thermal breaker 40, the thermal breaker 40 includes an insulating tube body 43 and an end cap 44, a metal sheet 41 is provided at the connection between the end cap 44 and the insulating tube body 43, and a fuse 42 is provided in the insulating tube body 43;

[0048] The metal sheet and the fuse are made of lead. When the current is 100A, the thickness of the metal sheet and the diameter of the fuse are both 0.5mm. Under the current of 100A, the temperature rises rapidly to the melting point of lead (about 327.5℃), causing melting. The melting time is completed within 10 milliseconds.

[0049] like Figure 1 , Figure 2 As shown, in this embodiment, the fuse is made of silver metal with a high melting point. Silver has a high electrical conductivity. Under the current condition of 100A, the diameters of the silver metal sheet and the silver fuse are both greater than or equal to 2mm, and the fusing time is greater than 100 milliseconds.

[0050] Specifically, the principle of the utility model is to provide reliable overheat protection in the circuit through the channel of the heat dissipation layer combined with the protective fuse, so as to reduce the impact of frequent voltage sags on the inductor.

Claims

1. An inductor with a thermal fuse for voltage sag, comprising an inductor (10), characterized in that: The inductor (10) is externally connected with an input line (20) and an output line (30). The inductor (10) comprises: an iron core and a coil. The coil comprises multiple layers, and multiple strip-shaped rigid insulating members are provided between each layer. The strip-shaped rigid insulating members are perpendicular to the winding direction of the coil. The two sides of the strip-shaped rigid insulating members in contact with the coil have wavy patterns matching the copper wire of the coil to form an air flow channel. The input line (20) is provided with a thermal breaker (40). The thermal breaker (40) comprises an insulating tube body (43) and two end caps (44) made of metal material. Metal sheets (41) are provided at the connection between the two end caps (44) and the insulating tube body (43). A fuse (42) is provided in the insulating tube body (43). The two ends of the fuse (42) are respectively connected to the two metal sheets (41).

2. An inductor with a thermal fuse for voltage sag according to claim 1, characterized in that: The end cap (44) is made of a metal material with good electrical conductivity.

3. The inductor with thermal fuse for voltage sag according to claim 2, characterized in that: The metal sheet (41) is made of a metal material with good electrical conductivity.

4. The inductor with thermal fuse for voltage sag according to claim 3, characterized in that: The metal sheet (41) is fixedly connected to the insulating tube body (43).

5. The inductor with thermal fuse for voltage sag according to claim 4, characterized in that: The end cap (44) and the metal sheet (41) are fixed via a snap-fit ​​connection structure or a sliding connection structure.

6. The inductor with thermal fuse for voltage sag according to claim 5, characterized in that: The end cap (44) is provided with a groove, and the metal sheet (41) is matched with a protrusion, the protrusion matches the groove, and the protrusion is used to fix the metal sheet (41) to the end cap (44).

7. An inductor with a thermal fuse for voltage sag according to claim 6, characterized in that: The insulating tube body (43) is in the shape of a cylindrical tube.

8. An inductor with a thermal fuse for voltage sag according to claim 7, characterized in that: The metal sheet (41) is made of a low melting point metal.

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