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CN-115831507-B - Overcurrent-preventing resistor

CN115831507BCN 115831507 BCN115831507 BCN 115831507BCN-115831507-B

Abstract

The application relates to an overcurrent-preventing resistor which comprises a shell and a resistance coil, wherein a winding tube is arranged at the bottom of the shell inwards, a first pin and a second pin are arranged outwards, the resistance coil is electrically connected with the first pin and the second pin, the resistance coil is sleeved on the winding tube and is electrically insulated from the winding tube, a magnetic piece is arranged in the winding tube, the magnetic piece is in sliding connection with the winding tube, magnetic poles of the magnetic piece are distributed along the axis of the winding tube, the magnetic piece is electrically connected with the winding tube, an electric contact opposite to the winding tube is arranged at the top inside the shell, an indicator lamp electrically connected with the electric contact is arranged at the top outside the shell, and a wire for electrically connecting the second pin is arranged inside the shell. The application has the function of rapidly measuring overcurrent and giving out warning in a laboratory.

Inventors

  • YI CHUNZHI
  • LI JUAN

Assignees

  • 深圳世纪稳特电子有限公司

Dates

Publication Date
20260508
Application Date
20221222

Claims (9)

  1. 1. The overcurrent-resistant resistor is characterized by comprising a shell (1) and a resistance coil (2), wherein a winding tube (3) is arranged at the bottom of the shell (1) inwards and is provided with a first pin (101) and a second pin (102) outwards, the resistance coil (2) is electrically connected with the first pin (101) and the second pin (102), the resistance coil (2) is sleeved on the winding tube (3) and is electrically insulated from the winding tube (3), a magnetic piece (4) is arranged in the winding tube (3), the magnetic piece (4) is in sliding connection with the winding tube (3) and the magnetic poles of the magnetic piece (4) are distributed along the axis of the winding tube (3), the magnetic piece (4) is electrically connected with the winding tube (3), the top inside the shell (1) is provided with an electric contact (5) opposite to the winding tube (3), the top outside the shell (1) is provided with an indicator lamp (6) electrically connected with the electric contact (5), the inside of the shell (1) is provided with a second conducting layer (301) which is arranged on the inner side of the conducting layer (3), the conducting layer (401) is arranged on the second conducting layer (4), the first conductive layer (301) and the second conductive layer (401) are slidably connected.
  2. 2. The overcurrent resistor according to claim 1, wherein the housing (1) includes a base (103), a tube (104) and a top plate (105), the tube (104) is fixedly connected to the base (103), the top plate (105) is fixedly mounted to the tube (104), the bobbin (3) is mounted to the base (103), and the electrical contact (5) is mounted to the top plate (105).
  3. 3. The overcurrent protection resistor according to claim 2, characterized in that the length of the bobbin (3) in the axial direction is smaller than the distance of the base (103) from the electrical contact (5).
  4. 4. An anti-over-current resistor according to claim 3, characterized in that the sum of the length of the bobbin (3) in the axial direction and the length of the magnetic member (4) in the axial direction of the bobbin (3) is greater than the distance of the base (103) to the electrical contact (5).
  5. 5. The overcurrent-preventing resistor according to claim 4, wherein a magnetic field generated in the bobbin (3) by the resistive coil (2) when a current in a predetermined direction is passed is repelled from a magnetic pole of the magnetic member (4) near the base (103).
  6. 6. The overcurrent protection resistor according to claim 5, wherein the resistive coil (2) generates a force on the magnetic member (4) in an axial direction of the bobbin (3) away from the base (103) that is less than a gravitational force of the magnetic member (4) when passing a rated current.
  7. 7. The overcurrent protection resistor according to claim 6, wherein the magnetic field generated by the resistive coil (2) generates a force on the magnetic member (4) in an axial direction of the bobbin (3) away from the base (103) that is less than a gravitational force of the magnetic member (4) when the current passed by the resistive coil (2) exceeds a threshold current value, wherein the threshold current is greater than the rated current.
  8. 8. The overcurrent protection resistor according to claim 2, wherein the first pin (101) and the second pin (102) are provided on a base (103).
  9. 9. The overcurrent resistor according to claim 2, wherein the base (103) is provided with a positioning ring groove (106), the shape of the positioning ring groove (106) is matched with the shape of one end, close to the base (103), of the pipe body (104), and one end, close to the base (103), of the pipe body (104) is embedded in the positioning ring groove (106).

Description

Overcurrent-preventing resistor Technical Field The application relates to the field of resistors, in particular to an overcurrent-preventing resistor. Background The resistor is a current limiting element for a circuit, and the wire-wound resistor is used as a common resistor and widely applied to various current limiting circuits, voltage dividing circuits, bleeder circuits and bias circuits, wherein the circuits are relatively high in power, and the resistor is always in a heat release state when the circuit is current-limited, so that the resistor is always in a high-temperature state. However, in a laboratory environment, a student cannot operate the resistor in a too large voltage source or cannot find the resistor in time due to unskilled or improper operation, so that the resistor is damaged due to excessive heat, and a great deal of time is spent for post-investigation, so that the efficiency of classroom experiments is affected. To avoid this problem, it is common to use a ammeter in series on the circuit or a voltmeter in parallel across the resistor. But this is not only inconvenient to operate but may also lead to damage to the voltmeter ammeter. Disclosure of Invention In order to rapidly detect overcurrent and give out warning, the application provides an overcurrent-preventing resistor. The application provides an overcurrent-preventing resistor, which adopts the following technical scheme: The utility model provides an overcurrent-resistant resistor, includes casing and resistance coil, the bottom of casing inwards is provided with the bobbin and outwards is provided with first pin and second pin, resistance coil electricity connect in first pin with the second pin, resistance coil snare is located on the bobbin and the electricity is insulated in the bobbin, be provided with the magnetic part in the bobbin, the magnetic part with bobbin sliding connection just the magnetic pole of magnetic part distributes along the axis of bobbin, the magnetic part with bobbin electric connection, the inside top of casing be provided with the relative electric contact of bobbin, the outside top of casing is provided with the pilot lamp with electric contact electric connection, the inside wire that is used for electrically connecting the second pin that is provided with of casing. Through adopting above-mentioned technical scheme, casing cladding resistance coil protects inside resistance coil. The first pin and the second pin are connected in series with the resistance coil and used for being connected with an external circuit. When the resistive coil is energized, a magnetic field is generated inside the resistive coil, and the direction of the magnetic field is related to the energizing direction of the resistive coil, so that the resistive coil needs to be energized in a predetermined current direction. When the internal excitation of the resistive coil generates a magnetic field, a force will be generated on the magnetic element towards the top or bottom of the housing. When the resistor coil is electrified according to a preset current direction, the magnetic field generates acting force towards the top of the shell on the magnetic piece, and when the current intensity exceeds a threshold value, the magnetic piece moves towards the electric contact against gravity under the action of magnetic force. At this time, the winding tube is electrically connected with the electric contact through the magnetic piece, and the indicator lamp is electrified to generate electricity so as to be used for indicating current overcurrent. Through this scheme, can be in the resistance through simple structure integration overcurrent alarm device, and need not external a large amount of surrounding circuits, it is very convenient. In addition, the circuit of the first pin, the winding tube, the magnetic part, the electric contact point, the indicator lamp, the lead wire and the second pin can also have the shunt effect on the resistance coil, so that the risk of burning out the resistance coil caused by long-term overcurrent can be reduced. Optionally, a first conductive layer is disposed on an inner side surface of the bobbin, a second conductive layer is disposed on an outer surface of the magnetic member, and the first conductive layer and the second conductive layer are slidably connected. Through adopting above-mentioned technical scheme, bobbin and magnetic part can be connected through first conducting layer and second conducting layer electricity, and first conducting layer sets up in the inboard of bobbin, has avoided the risk of taking place the short circuit when resistance coil's enamelled wire lacquer skin is damaged. The second conductive layer is arranged outside the magnetic part, so that the defect of poor conductivity of ferrite of the magnetic part can be overcome. Optionally, the casing includes base, body and roof, body fixed connection is on the base, roof fixed mounting is on the body, the bobbin