Resistor tube convenient for fault detection

Abstract

The utility model relates to the technical field of resistance tubes, in particular to a resistance tube convenient for fault detection, which comprises a metal outer tube and a resistance wire arranged in the metal outer tube in a penetrating manner, the metal outer tube is filled with insulating powder, so that the resistance wire is separated from the inner wall of the metal outer tube, a PTC (Positive Temperature Coefficient) resistor and a leading-out terminal are arranged at the end part of the metal outer tube, and the PTC resistor is connected with the leading-out terminal. One end of the PTC resistor is connected with the resistance wire, the other end of the PTC resistor is connected with the leading-out terminal, the leading-out terminal extends out of the metal outer tube, and the PTC resistor is insulated from the inner wall of the metal outer tube; and an induction coil sleeved outside the leading-out terminal is arranged at the port of the metal outer tube and is connected with an indicator lamp. When the resistance tube is abnormal, the resistance wire is burnt out, no current passes through the leading-out terminal, the induction coil has no induction current, and the indicating lamp is extinguished, so that whether the resistance tube is normal or not can be quickly judged, and when a fault occurs, the position of the fault resistance tube can be quickly positioned and replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of resistor tubes, in particular to a resistor tube which is convenient for fault detection. Background Art

[0002] With the development of power electronics, the requirements for the integration of equipment and the use of loads are getting higher and higher. As the main component of the load, the stability and safety of the resistor are extremely important. During the use of resistors, the resistors often overheat and burn out, and even burn out other components, leading to safety accidents. Furthermore, for multiple parallel resistors used in the load, it is difficult to determine the location of the faulty resistor tube after a single resistor tube fails, which brings great inconvenience to maintenance. Summary of the invention

[0003] In view of the above technical problems existing in the prior art, the utility model provides a resistor tube which is easy to detect faults. When the resistance wire becomes high temperature, the resistance power will be automatically reduced to reduce the heat generation and prevent safety accidents caused by excessive temperature. In addition, in many resistor tubes, burnt resistors can be easily identified and quickly replaced.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] Provided is a resistor tube for easy fault detection, comprising a metal outer tube and a resistor wire inserted in the metal outer tube, the metal outer tube is filled with insulating powder to separate the resistor wire from the inner wall of the metal outer tube, and is characterized in that: a PTC resistor and a lead-out terminal are provided at the end of the metal outer tube, one end of the PTC resistor is connected to the resistor wire, the other end of the PTC resistor is connected to the lead-out terminal, and the lead-out terminal extends out of the metal outer tube, and the PTC resistor and the inner wall of the metal outer tube are insulated from each other; an induction coil sleeved outside the lead-out terminal is provided at the port of the metal outer tube, and the induction coil is connected to an indicator light.

[0006] Specifically, the insulating powder is magnesium oxide powder.

[0007] Specifically, a light-transmitting insulating column is provided at the port of the metal outer tube, the induction coil and the indicator light are wrapped in the insulating column, and the insulating column blocks the port of the metal outer tube.

[0008] Specifically, the insulating column is formed by cooling hot-melt epoxy resin.

[0009] Specifically, the insulating column is arranged flush with the outer wall of the metal outer tube.

[0010] Specifically, the segment of the lead-out terminal located in the metal outer tube is also surrounded by the insulating powder, or is poured with epoxy resin.

[0011] Specifically, the resistance wire is arranged in a spiral or wave shape inside the metal outer tube.

[0012] Specifically, the metal outer tube is an aluminum tube.

[0013] Specifically, the metal outer tube is a straight tube or a U-shaped tube.

[0014] Specifically, the end of the resistor and the end of the lead terminal are respectively welded and fixed to the PTC resistor.

[0015] Beneficial effects of the utility model:

[0016] The utility model discloses a resistor tube which is convenient for fault detection. When the resistor tube is used at normal temperature, the resistance of the PTC resistor is within a normal range. When the resistor is abnormal (such as short circuit) and the temperature is too high, the resistance of the PTC resistor increases, and the higher the temperature, the greater the resistance, so that the resistance of the entire resistor tube increases, the power decreases, and then the heat generation decreases, thereby avoiding faults caused by excessive temperature.

[0017] When the resistor tube works normally, current passes through the lead-out terminals, and the external induction coil generates induced current through electromagnetic induction, which lights up the indicator light. When the resistor tube is abnormal, the resistance wire burns out, no current passes through the lead-out terminals, and the induction coil has no induced current, so the indicator light goes out. This allows you to quickly determine whether the resistor tube is normal. When a fault occurs, you can quickly locate the faulty resistor tube and replace it. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a resistor tube for facilitating fault detection in an embodiment.

[0019] Figure 2 for Figure 1 A partial enlarged view of .

[0020] Reference numerals:

[0021] Metal outer tube 1, resistance wire 2, insulating powder 3, PTC resistor 4, lead terminal 5, induction coil 6, indicator light 7, insulating column 8. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with specific embodiments and drawings.

[0023] A resistor tube that is convenient for fault detection in this embodiment, such as Figure 1 and Figure 2As shown, it includes a metal outer tube 1 and a resistance wire 2 inserted in the metal outer tube 1. The metal outer tube 1 is an aluminum tube. The metal outer tube 1 is filled with insulating powder 3. The insulating powder 3 is magnesium oxide powder, so that the resistance wire 2 is separated from the inner wall of the metal outer tube 1. The end of the metal outer tube 1 is provided with a PTC resistor 4 and a lead terminal 5. One end of the PTC resistor 4 is connected to the resistance wire 2, and the other end of the PTC resistor 4 is connected to the lead terminal 5. The lead terminal 5 extends out of the metal outer tube 1. The outer side of the PTC resistor 4 is provided with an insulating layer so that a rubber layer is provided between the inner wall of the metal outer tube 1 to achieve mutual insulation. The port of the metal outer tube 1 is provided with an induction coil 6 sleeved outside the lead terminal 5, and the induction coil 6 is connected to an indicator light 7. The end of the resistor and the end of the lead terminal 5 are fixed to the PTC resistor 4 by welding.

[0024] Specifically, a light-transmitting insulating column 8 is provided at the end of the metal outer tube 1. The insulating column 8 is formed by cooling hot-melt epoxy resin. The induction coil 6 and the indicator light 7 are wrapped in the insulating column 8. The insulating column 8 blocks the end of the metal outer tube 1. The insulating column 8 is arranged flush with the outer wall of the metal outer tube 1.

[0025] In this embodiment, the segment of the lead-out terminal 5 located inside the metal outer tube 1 is also surrounded by the insulating powder 3 or is poured with epoxy resin.

[0026] In practice, the resistance wire 2 is arranged in a spiral or wave shape inside the metal outer tube 1 .

[0027] In this embodiment, the metal outer tube 1 is a straight tube, but can actually be changed to a U-shaped tube.

[0028] When the resistor tube is used at normal temperature, the resistance of the PTC resistor 4 is within the normal range; when the resistor is abnormal (such as short circuit) and the temperature is too high, the resistance of the PTC resistor 4 becomes larger, and the higher the temperature, the greater the resistance, which increases the resistance of the entire resistor tube, reduces the power, and then reduces the heat generation, thereby avoiding accidents caused by excessive temperature.

[0029] When the resistor tube is working normally, AC current passes through the lead terminal 5, and the external induction coil 6 generates an induced current through electromagnetic induction, which lights up the indicator light 7. The principle is: when AC current passes through the lead terminal, a changing magnetic field is generated in the closed induction coil 6 next to it, which will generate current. When the resistor tube is abnormal, the resistance wire 2 burns out, no current passes through the lead terminal 5, and the induction coil 6 has no induced current, and the indicator light 7 goes out. In this way, it can be quickly determined whether the resistor tube is normal. When a fault occurs, the position of the faulty resistor tube can be quickly located and the faulty resistor tube can be replaced.

[0030] The manufacturing method of the above resistor tube comprises the following steps:

[0031] 1. Spray metal electrodes on both sides of the cylindrical PTC resistor 4;

[0032] 2. Weld the lead terminal 5 to one end of the PTC resistor 4 and the resistance wire 2 to the other end.

[0033] 3. Install the welded resistance wire 2 and PTC resistor 4 into the metal outer tube 1, then fill it with magnesium oxide powder, and finally compact the magnesium oxide powder by shrinking the tube;

[0034] 4. Install an LED indicator light 7 on the induction coil 6;

[0035] 5. The induction coil 6 equipped with the indicator light 7 is encapsulated and fixed with transparent epoxy resin to form an insulating column 8;

[0036] 6. Install the insulating column 8 outside the lead-out terminal 5 at both ends of the metal outer tube 1 to replace the original porcelain head of the resistor.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt the conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A resistance tube for easy fault detection, comprising a metal outer tube and a resistance wire inserted into the metal outer tube, wherein the metal outer tube is filled with insulating powder to separate the resistance wire from the inner wall of the metal outer tube, and wherein: A PTC resistor and a lead-out terminal are provided at the end of the metal outer tube, one end of the PTC resistor is connected to the resistance wire, and the other end of the PTC resistor is connected to the lead-out terminal, and the lead-out terminal extends out of the metal outer tube, and the PTC resistor and the inner wall of the metal outer tube are insulated from each other; an induction coil sleeved outside the lead-out terminal is provided at the port of the metal outer tube, and the induction coil is connected to an indicator light.

2. The resistor tube for facilitating fault detection according to claim 1 is characterized in that: The insulating powder is magnesium oxide powder.

3. The resistor tube for facilitating fault detection according to claim 1 is characterized in that: A light-transmitting insulating column is arranged at the port of the metal outer tube, the induction coil and the indicator light are wrapped in the insulating column, and the insulating column blocks the port of the metal outer tube.

4. The resistor tube for facilitating fault detection according to claim 3 is characterized in that: The insulating column is formed by cooling hot-melt epoxy resin.

5. The resistor tube for facilitating fault detection according to claim 3 is characterized in that: The insulating column is arranged flush with the outer wall of the metal outer tube.

6. The resistor tube for facilitating fault detection according to claim 1 is characterized in that: The segment of the lead-out terminal located in the metal outer tube is also surrounded by the insulating powder or is poured with epoxy resin.

7. The resistor tube for facilitating fault detection according to claim 1 is characterized in that: The resistance wire is arranged in a spiral or wave shape inside the metal outer tube.

8. The resistor tube for facilitating fault detection according to claim 1 is characterized in that: The metal outer tube is an aluminum tube.

9. The resistor tube for facilitating fault detection according to claim 1 is characterized in that: The metal outer tube is a straight tube or a U-shaped tube.

10. The resistor tube for facilitating fault detection according to claim 1 is characterized in that: The ends of the resistor and the ends of the lead terminals are respectively fixed to the PTC resistor by welding.

Images