Embedded high-strength resistor

Abstract

The invention relates to the technical field of resistors, in particular to an embedded high-strength resistor which comprises a resistor shell, a resistance wire, a resistor lead, a ceramic core and a sliding assembly, the ceramic core is installed in the resistor shell, the resistor shell is provided with the resistor lead, the sliding assembly is arranged in the resistor shell, and the resistor lead is arranged in the sliding assembly. The sliding assembly is located on one side of the ceramic core, the ceramic core is sleeved with the resistance wire, one end of the resistance wire is connected with the inner wall of the resistor shell, and the other end of the resistance wire is connected with the sliding assembly. According to the invention, the sliding assembly is arranged to control the fitting and disconnection of the copper rod and the resistor lead, so that the resistor is prevented from being fused due to a protection circuit due to uncertain factors such as lightning stroke of electrical equipment or current increase at the moment of unstable voltage, and the troubleshooting and replacement times of a fault resistor by workers are effectively reduced; the maintenance cost of the electrical equipment is reduced, and the service life of the electrical equipment is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of resistors, in particular to an embedded high-strength resistor. Background Art

[0002] A fuse resistor, also known as a fusible resistor, has the functions of both a resistor and a fuse. It is usually used only as a resistor; once the current is too large, it will play the role of a fuse to protect machinery and equipment, protect other components in the circuit from damage, and improve the safety and economy of the circuit. There are two fusing principles for traditional fusible resistors. One is to add a fuse to the lead at one end of the resistor body. When the current passing through is too large, the fuse will blow, thereby protecting the resistor and the circuit; the other is to coat the resistance wire inside the resistor with a layer of heat-insulating and insulating skin. When the current is too large, the heating rate of the resistance wire increases. When the heat in the resistance wire cannot be dissipated in time, the fuse point on the resistance wire will blow in time to protect the circuit. The above two types of fusible resistors both achieve the function of protecting the circuit by increasing the temperature under specific overcurrent conditions. However, in some special circumstances, such as lightning strikes or voltage instability, when the current suddenly increases for an instant, and then the current returns to normal, the entire circuit cannot return to normal after the resistor blows, and the resistor needs to be replaced in time, which increases the maintenance cost of the entire electrical equipment.

[0003] In order to address the shortcomings of existing fuse resistors and prevent the entire circuit from being unable to return to normal after the resistor melts when the electrical equipment is struck by lightning or the voltage is unstable and the current suddenly increases, the invention patent with application number CN202110174004.1 provides an insulated wire-wound molded temperature fuse resistor. The invention arranges a movable copper sheet inside the resistor, and a sliding metal sheet is installed on the movable copper sheet. When the sliding metal sheet contacts the inner cavity of the resistor, the circuit is connected. When the sliding metal sheet is separated from the inner cavity, the circuit is disconnected and the current cannot flow. The movement of the movable copper sheet is controlled by a permanent magnet inside the resistor. When the current is normal, the permanent magnet has a small adsorption force on the movable copper sheet. When the equipment is struck by external lightning or the voltage fluctuates, causing the current in the circuit to increase several times instantly, the magnetic field formed by the permanent magnet and the wound resistance wire increases, and the adsorption force of the permanent magnet on the movable copper sheet increases, causing the movable copper sheet to move. The sliding metal sheet is separated from the inner cavity and automatically disconnects the circuit to protect the circuit. This protection will not cause the resistor to be scrapped, but the magnetic force brought by the permanent magnet inside the resistor will affect the current flowing through the resistor when it is working normally, thereby affecting the working stability of the electrical equipment.

[0004] Therefore, in order to prevent the electrical equipment from being struck by lightning or the voltage from being unstable and the current suddenly increasing, which may cause the circuit to be unable to return to normal after the resistor is blown, an embedded high-strength resistor is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide an embedded high-strength resistor. In order to prevent electrical equipment from being struck by lightning or the voltage is unstable and the current suddenly increases, such uncertain factors may cause the resistor to melt due to reasons other than the protection circuit, resulting in the need to check and replace the resistors in the entire circuit, thereby increasing the maintenance cost of the electrical equipment. The temperature change is used to control whether the copper rod is in contact with the resistor lead, so that the circuit inside the resistor is connected or disconnected, thereby avoiding unexpected situations that cause the circuit to be unable to return to normal after the resistor melts, effectively reducing the number of times the staff checks and replaces the faulty resistor, reducing the maintenance cost of the electrical equipment, and increasing the service life of the electrical equipment.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An embedded high-strength resistor comprises a resistor housing, a resistor wire, a resistor lead, a ceramic core, and a sliding component. The ceramic core is installed inside the resistor housing. The ceramic core is arranged in a cylindrical shape and one end is in contact with the side wall of the resistor housing. The resistor leads are symmetrically arranged on both sides of the resistor housing. The resistor leads pass through the side wall of the resistor housing and enter the inside of the resistor housing. The sliding component is arranged inside the resistor housing. The sliding component is located on one side of the ceramic core. The sliding component is slidably connected to the inner wall of the resistor housing. The sliding component contacts the resistor lead on one side. The resistor wire is wound on the ceramic core. One end of the resistor wire is connected to the resistor lead on the other side, and the other end is connected to the sliding component. The resistor wire is coated with an insulating skin layer. The sliding component is separated from the contact with the resistor wire through thermal expansion, and contacts with the resistor wire again after cooling and shrinking.

[0008] The ceramic core is fixedly installed inside the resistor housing, and the resistance wire is sleeved on the ceramic core. One end of the resistance wire is connected to the inner wall of the resistor housing, and the other end is connected to the sliding component. The sliding component is in contact with the resistor lead. The current in the resistor lead at one end is transferred to the resistance wire through the sliding component and finally flows out from the resistor lead at the other end. Under normal conditions, the resistance work is completed. The sliding component is slidably connected to the inner wall of the resistor housing. If the electrical equipment has unstable voltage, the instantaneous current suddenly increases, or it is struck by lightning, causing the circuit temperature to rise, the sliding component will move to the side close to the ceramic core and disconnect the connection with the resistor lead. The circuit is disconnected at the same time as the touch. At this time, the instantly increased current cannot be transmitted through the resistor, and the high heat caused by the increased current cannot be transmitted to the resistor wire to prevent the resistor wire from melting. When the current in the circuit returns to normal and the circuit temperature drops, the sliding component will move again to fit and contact the resistor lead, and the resistor can work normally again, avoiding electrical equipment from being struck by lightning or the voltage being unstable and the current increasing instantly. Such uncertain factors may cause the resistor to melt not because of the protection circuit, effectively reducing the number of times the staff needs to check and replace the faulty resistor, reducing the maintenance cost of electrical equipment, and increasing the service life of electrical equipment.

[0009] Preferably, the sliding component includes a sliding copper sheet and a driving spring. The sliding copper sheet is slidably installed inside the resistor housing. The sliding copper sheet is arranged in a circular shape and the side wall of the sliding copper sheet is fitted with the inner wall of the resistor housing. One end of the resistor wire is fixedly connected to one side of the sliding copper sheet. A copper rod is vertically installed on one side of the sliding copper sheet, and the copper rod is fitted with the resistor lead. The driving spring is made of a memory metal material. The driving spring extends when the set temperature is reached. A locking component is arranged on the sliding copper sheet, and the locking component locks and unlocks the sliding component through temperature control.

[0010] By setting the side wall of the sliding copper sheet to fit with the inner wall of the resistor housing, the sliding copper sheet can slide smoothly inside the resistor housing. The driving spring is made of memory metal material and is connected to the sliding copper sheet. When the resistor is working normally, the copper rod fits with the resistor lead on the inner wall of the resistor housing to transfer the current and heat in the resistor lead. When the electrical equipment is struck by lightning or the voltage is unstable and the current increases instantly, the temperature of the driving spring rises to the set temperature. At this time, the driving spring stretches to give a thrust to the sliding copper sheet, and the sliding copper sheet moves toward the ceramic core. The copper rod breaks contact with the resistor lead, and the circuit is disconnected. When the unstable voltage disappears or the lightning strike disappears, After that, the temperature of the driving spring drops below the set temperature, the driving spring contracts to make the copper rod contact with the resistor lead again, and the circuit returns to normal. The locking component on the sliding copper sheet locks the sliding component when the resistor is in normal working condition to prevent the sliding component from moving. When the temperature of the driving spring reaches the set temperature, the locking component unlocks the sliding component to allow the sliding copper sheet to move. The heat brought by the resistor lead controls the expansion and contraction of the driving spring, so that the resistor wire will not melt due to unexpected factors. After avoiding the influence of lightning strikes and instantaneous current increases due to voltage instability, the resistor can resume working, reducing the number of repairs and replacements for the resistor and increasing the service life of the resistor.

[0011] Preferably, the driving spring is sleeved on the copper rod and contacts the copper rod, one side of the driving spring is in contact with the inner wall of the resistor housing and contacts with the resistor lead, and the other side is in contact with the sliding copper sheet.

[0012] By sleeveing ​​the driving spring on the copper rod and contacting the copper rod, one end of the driving spring is connected to the inner wall of the resistor housing and contacts the resistor lead on the resistor housing, and the other end is connected to the sliding copper sheet. When the driving spring is extended, it can push the sliding copper sheet. The memory metal material has poor electrical conductivity. When the driving spring pushes the sliding copper sheet to disconnect the copper rod from the resistor lead, one end of the driving spring simultaneously disconnects from the resistor lead on one side. The heat on the resistor lead cannot be transferred to the driving spring, avoiding the driving spring from continuously heating up and causing the temperature to be too high to cause the resistor wire to melt. The contact between the driving spring and the resistor lead can improve the response speed of the mechanism and avoid damage to the electrical equipment.

[0013] Preferably, the locking assembly includes a deformation plate, a fixing pin, and a locking hole. Two deformation plates are symmetrically installed on the sliding copper plate, and fixing pins are vertically installed on the two deformation plates. Two rectangular blocks are symmetrically arranged on the inner wall of the resistor housing, and locking holes are opened on the two rectangular blocks. The locking holes are set as cylindrical shallow grooves, and the fixing pins are inserted into the locking holes. The deformation plate is made of bimetallic sheet, and the deformation plate bends and deforms when the set temperature is reached.

[0014] By installing a deformation plate made of a bimetallic sheet on a sliding copper sheet, due to the different thermal expansion coefficients of each component layer of the bimetallic material, the one with a higher expansion coefficient is called an active layer; the one with a lower expansion coefficient is called a passive layer. When the temperature changes, the deformation of the active layer is greater than that of the passive layer, so that the entire bimetallic sheet will bend toward the passive layer. When the resistor is working normally, the deformation plate is parallel to the axis of the sliding copper sheet, the fixing pin is located in the locking hole, and the locking component fixes the sliding copper sheet to limit the movement of the sliding component. When the electrical equipment encounters a lightning strike or the voltage is unstable and the current increases instantly, the heat on the resistor lead is transferred to the sliding copper sheet through the copper rod, and the sliding copper sheet is heated together with the deformation plate. At this time, the deformation plate bends toward the axis of the sliding copper sheet, the fixing pin leaves the locking hole, and the locking component releases the fixation of the sliding copper sheet. The locking component locks the sliding component when the resistor is working normally, so as to prevent the driving spring from extending or contracting when the resistor is affected by external force and vibrates, thereby affecting the transmission of current in the resistor, thereby improving the working stability of the resistor.

[0015] Preferably, the sliding copper sheet is provided with an arc interface on the side close to the ceramic core, and the arc interface is composed of two symmetrical arc tiles. A cylindrical groove is opened on one side of the ceramic core, and the arc interface gap is slidably installed in the cylindrical groove. Two rotating shafts are symmetrically arranged in the sliding copper sheet, and two rotating plates are symmetrically arranged in the resistor housing. The two rotating plates pass through the sliding copper sheet and are rotatably connected to the rotating shafts. One end of the two rotating plates is respectively fixedly connected to the deformation plate. A pressure rod is provided on the rotating plate close to the ceramic core, and the end of the pressure rod abuts against the surface of the arc interface.

[0016] By setting an arc interface on the sliding copper sheet, the arc interface gap is slidably installed in the cylindrical groove, which is convenient for the horizontal movement of the sliding copper sheet when the sliding assembly is working, and at the same time can reduce the installation accuracy of the sliding copper sheet and the ceramic core. One end of the rotating plate is fixedly installed on the deformation plate, and the other end passes through the sliding copper sheet and abuts against the surface of the arc interface through a pressure rod. The rotating plate is sleeved on the rotating shaft and can be rotated in the horizontal direction with a limited limit. When the deformation plate is parallel to the axis of the sliding copper sheet, the pressure rod will apply pressure to the surface of the arc interface. When the resistor is working normally, the arc interface is close to the ceramic core. Inside the ceramic core, the heat transfer and dissipation is enhanced. After the deformation plate reaches the set temperature and bends, the rotating plate rotates, and the end of the pressure rod leaves the arc interface surface. When the sliding assembly is working, the arc interface and the cylindrical groove restore the clearance fit, which is convenient for the movement of the sliding copper sheet. Under temperature changes, the pressure rod and the deformation plate are linked to improve the contact heat dissipation of the sliding copper sheet. The installation of the sliding copper sheet and the fixing pin will cause partial position gaps inside the mechanism. The clearance fit of the arc interface can reduce the installation coaxiality of the arc interface and the ceramic core, reduce the installation accuracy of the equipment, and save production costs.

[0017] Preferably, a trapezoidal plate is provided on the rectangular block, and the trapezoidal plate is provided as an arc-shaped slide near one end of the fixing pin, and the end of the fixing pin is provided as a semicircle, and the end of the fixing pin is slidably matched with the arc-shaped slide. When the deformation plate is bent and deformed, it drives the fixing pin to slide on the upper limit of the arc-shaped slide.

[0018] By arranging a trapezoidal plate on the rectangular block, the deformation plate is bent by heat to release the lock on the sliding copper sheet, and the driving spring pushes the sliding copper sheet to move toward the ceramic core. During the movement of the sliding copper sheet, the fixed pin slides on the arc-shaped landslide. After the sliding copper sheet stops moving, the fixed pin and the slope of the arc-shaped landslide are offset, and the arc-shaped landslide gives the fixed pin a thrust. When the temperature of the deformation plate is lower than the set temperature, the deformation plate will recover from the bent shape to a horizontal state. Under the thrust of the arc-shaped landslide and the deformation force of the deformation plate, the fixed pin moves along the arc-shaped landslide toward the locking hole, and is finally inserted into the locking hole to complete the resetting of the locking assembly.

[0019] Preferably, the portion where the pressure rod abuts against the arc interface surface is configured as an arc plate, and the radius of the arc plate is 1-2 mm smaller than the radius of the arc interface.

[0020] By setting the abutting part between the pressure rod and the arc interface surface as an arc plate, the arc plate can wrap the arc interface when the deformation plate is parallel to the axis of the sliding copper sheet, so that the pressure of the pressure rod is evenly applied to the arc interface, and when the deformation plate is bent by heat, the arc plate can rotate in the horizontal direction with the rotating plate within the upper limit, and the arc plate leaves the arc interface surface. The arc plate no longer applies pressure to the arc interface surface, thereby facilitating the sliding of the arc interface in the horizontal direction.

[0021] Preferably, protective sleeves are symmetrically arranged at both ends of the side walls of the resistor housing, the protective sleeves wrap the welding points of the resistor leads and the resistor leads, and the protective sleeves are made of insulating high-temperature resistant rubber material.

[0022] By adding protective sleeves to the resistor leads and the welding joints, the resistor leads can be prevented from being subjected to stress when the electrical equipment is vibrated or shaken, causing the resistor leads to bend and break or the welding joints to be disconnected, thereby increasing the service life of the resistor.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By setting a sliding component to control the fitting and disconnection of the copper rod and the resistor lead, the electrical equipment can be prevented from being hit by lightning or the voltage is unstable and the current increases instantly. Such uncertain factors may cause the resistor to fuse not because of the protection circuit. After avoiding the influence of lightning strikes and the instantaneous increase of current due to voltage instability, the resistor can be restored to work, effectively reducing the number of times the staff needs to check and replace the faulty resistor, reducing the maintenance cost of electrical equipment, and increasing the service life of electrical equipment.

[0025] 2. By setting the driving spring on the copper rod and making it contact with the copper rod, when the driving spring pushes the sliding copper sheet to make the copper rod break contact with the resistor lead, one end of the driving spring simultaneously breaks contact with the resistor lead on one side, and the heat on the resistor lead cannot be transferred to the driving spring, thus preventing the driving spring from continuously heating up and causing the temperature to be too high and causing the resistor wire to melt. The contact between the driving spring and the resistor lead can improve the response speed of the mechanism and avoid damage to electrical equipment.

[0026] 3. By setting a locking component to lock the sliding component when the resistor is in normal working state, it is prevented that the driving spring stretches or contracts when the resistor is vibrated by external force, which affects the transmission of current in the resistor, thereby improving the working stability of the resistor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the appearance structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the connection of the resistance wire of the present invention;

[0029] Figure 3 It is a schematic diagram of the arc interface connection of the present invention;

[0030] Figure 4 It is a schematic diagram of a sliding assembly of the present invention;

[0031] Figure 5 It is a schematic diagram of the locking assembly of the present invention;

[0032] Figure 6 is a cut-away side view of the present invention;

[0033] Figure 7 It is a working schematic diagram of the driving spring of the present invention;

[0034] Figure 8 It is a schematic diagram of bending of the deformable plate of the present invention.

[0035] In the figure: 1. resistor housing; 2. resistor wire; 3. resistor lead; 4. ceramic core; 41. cylindrical groove; 5. sliding assembly; 51. sliding copper sheet; 511. arc interface; 512. rotating shaft; 52. driving spring; 53. copper rod; 6. locking assembly; 61. deformation plate; 62. fixing pin; 63. locking hole; 7. rectangular block; 71. trapezoidal plate; 72. arc landslide; 8. rotating plate; 81. pressure rod; 82. arc plate; 9. protective sleeve. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms "inside", "on", "fit", "bend", "surface", "parallel", "one side" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] See also Figures 1 to 8 The present invention provides an embedded high-strength resistor, and the technical solution is as follows:

[0039] The resistor housing 1 is embedded and installed inside the electrical equipment. The shape of the resistor housing 1 is set to be cylindrical. The ceramic core 4 is fixedly installed inside the resistor housing 1. The ceramic core 4 is also set to be cylindrical with a radius smaller than the resistor housing 1, and one end of the ceramic core 4 is in contact with the side wall of the resistor housing 1. Resistor leads 3 are symmetrically arranged on both sides of the resistor housing 1. The resistor leads 3 are fixed on the resistor housing 1 by welding and pass through the inner wall of the resistor housing 1. A sliding component 5 is arranged inside the resistor housing 1. The sliding component 5 is located on one side of the ceramic core 4. The resistance wire 2 is sleeved on the ceramic core 4, one end is connected to the sliding component 5, and the other end is connected to the inner wall of the resistor housing 1, and the resistance wire 2 is covered with an insulating layer. The other side of the sliding component 5 is slidably connected to the inner wall of the resistor housing 1 and contacts with the resistor lead 3 on this side. When the resistor is in normal working state, the current in the resistor lead 3 on this side is transmitted to the resistance wire 2 through the sliding component 5. Then it flows out from the resistor lead 3 on the other side. The transformation temperature of the memory metal material is set to 80°C. If the electrical equipment has unstable voltage and the current suddenly increases or is struck by lightning, causing the circuit temperature to rise, the sliding component 5 will move to the side close to the ceramic core 4 when it reaches the set temperature, and disconnect the circuit while disconnecting the contact with the resistor lead 3. At this time, the instantly increased current cannot be transmitted through the resistor, and the high heat brought by the increased current cannot be transmitted to the resistance wire 2, preventing the resistance wire 2 from melting. When the current in the circuit returns to normal and the circuit temperature drops, the sliding component 5 will move again to fit and contact the resistor lead 3, and the resistor can work normally again, avoiding the electrical equipment being struck by lightning or the voltage being unstable and the current increasing instantly. Such uncertain factors cause the resistor to melt not because of the protection circuit, effectively reducing the number of times the staff checks and replaces the faulty resistor, reducing the maintenance cost of electrical equipment, and increasing the service life of electrical equipment.

[0040] As an embodiment of the present invention, refer to Figures 4 to 8The sliding assembly 5 includes a sliding copper sheet 51 and a driving spring 52. The sliding copper sheet 51 is set to be circular and is coaxially installed inside the resistor housing 1 with the resistor housing 1. The side wall of the sliding copper sheet 51 fits with the inner wall of the resistor housing 1, so that the sliding copper sheet 51 can slide smoothly inside the resistor housing 1. A copper rod 53 is vertically installed on the side of the sliding copper sheet 51 close to the inner wall of the resistor housing 1. The driving spring 52 is sleeved on the copper rod 53 and does not contact the copper rod 53. One end of the driving spring 52 is connected to the inner wall of the resistor housing 1 and contacts the resistor lead 3 at the same time, and the other end is connected to the sliding copper sheet 51. The driving spring 52 is connected to the inner wall of the resistor housing 1 and contacts the resistor lead 3 at the same time. The dynamic spring 52 is made of memory metal material. The copper rod 53 fits with the resistor lead 3 when the resistor is in normal working state, and is used to transfer the current and heat in the resistor lead 3. When the electrical equipment is struck by lightning or the voltage is unstable and the current increases instantly, the temperature of the driving spring 52 rises to the set temperature. At this time, the driving spring 52 will stretch and bring thrust to the sliding copper sheet 51. The sliding copper sheet 51 moves toward the ceramic core 4. The copper rod 53 moves with the sliding copper sheet 51 and breaks the contact with the resistor lead 3. The circuit is disconnected. When the unstable voltage disappears or the lightning disappears, the temperature of the driving spring 52 When the temperature drops below the set temperature, the drive spring 52 contracts and drives the sliding copper sheet 51 to move, so that the copper rod 53 contacts the resistor lead 3 again, and the circuit returns to normal. The electrical conductivity of the memory metal material is poor. When the drive spring 52 pushes the sliding copper sheet 51 to disconnect the copper sheet from the resistor lead 3, only a small amount of current will be transferred to the resistor wire 2 through the drive spring 52. The heat brought by the small amount of current cannot melt the resistor wire 2, while the heat on the resistor lead 3 can directly pass through the drive spring 52, thereby improving the heat transfer effect and improving the working stability of the sliding component 5. The sliding copper sheet 51 is provided with a locking Component 6, when the resistor is in normal working condition, the locking component 6 locks the sliding component 5 to prevent the sliding component 5 from moving. When the temperature of the driving spring 52 rises to the set temperature, the locking component 6 unlocks the sliding component 5, so that the sliding copper sheet 51 can move under the deformation of the driving spring 52. The heat brought by the resistor lead 3 controls the expansion and contraction of the driving spring 52, so that the resistance wire 2 will not be melted due to unexpected factors, and after avoiding the influence of lightning strikes and instantaneous current increase due to voltage instability, the resistor can be restored to work, reducing the number of repairs and replacements for the resistor and increasing the service life of the resistor.

[0041] As an embodiment of the present invention, refer to Figures 3 to 8The locking assembly 6 includes a deformation plate 61, a fixing pin 62, and a locking hole 63. Two deformation plates 61 are symmetrically installed on the same side of the sliding copper sheet 51. The deformation plate 61 is made of a bimetallic sheet. Due to the different thermal expansion coefficients of the component layers of the bimetallic sheet, the one with a higher expansion coefficient is called the active layer; the one with a lower expansion coefficient is called the passive layer. When the temperature changes, the deformation of the active layer is greater than that of the passive layer, so that the entire bimetallic sheet will bend toward the passive layer. The fixing pins 62 are vertically installed on the two deformation plates 61. Two rectangular blocks 7 are symmetrically arranged on the inner wall of the resistor housing 1 on the same side of the fixing pins 62. A circular locking hole 63 is provided on the rectangular block 7. When the resistor is in normal working condition, the deformation plate 61 is parallel to the axis of the sliding copper sheet 51, and the fixing pin 62 is inserted into the locking hole 63. The fixing pin 62 fixes the sliding copper sheet 51 to limit the movement of the sliding component 5. When the electrical equipment is struck by lightning or the voltage is unstable and the current increases instantly, the heat on the resistor lead 3 is transferred to the sliding copper sheet 51 through the copper rod 53, and the deformation plate 61 is heated together with the sliding copper sheet 51. When the deformation plate 61 reaches the set temperature, it will bend toward the axis direction of the sliding copper sheet 51, and the deformation plate 61 drives the fixing pin 62 to leave the locking hole 6 3. After the locking assembly 6 releases the fixation of the sliding copper sheet 51, the sliding assembly 5 starts to work. The locking assembly 6 locks the sliding assembly 5 under the normal working state of the resistor to prevent the driving spring 52 from extending or contracting when the resistor is vibrated by external force, which affects the transmission of current in the resistor, thereby improving the working stability of the resistor; a trapezoidal plate 71 is provided on the rectangular block 7, and the side of the trapezoidal plate 71 close to the fixing pin 62 is provided with an arc slide 72, and the end of the fixing pin 62 contacting the locking hole 63 is provided with a semicircular shape, and the end of the fixing pin 62 can slide with the arc slide 72, and the deformation plate 61 is bent by heat to release the fixing of the sliding copper sheet 5 1, the driving spring 52 pushes the sliding copper sheet 51 to move toward the ceramic core 4. During the movement of the sliding copper sheet 51, the fixing pin 62 slides on the arc-shaped landslide 72. After the sliding copper sheet 51 stops moving, the fixing pin 62 abuts against the slope of the arc-shaped landslide 72. The arc-shaped landslide 72 gives the fixing pin 62 a thrust. When the temperature of the deformation plate 61 is lower than the set temperature, the deformation plate 61 will recover from the bent shape to the horizontal state. Under the thrust of the arc-shaped landslide 72 and the deformation force of the deformation plate 61, the fixing pin 62 moves along the arc-shaped landslide 72 toward the locking hole 63, and finally inserts into the locking hole 63, completing the reset of the locking assembly 6.The sliding copper sheet 51 is provided with an arc interface 511 on one side close to the ceramic core 4. The arc interface 511 is composed of two symmetrical arc tiles. The ceramic core 4 is provided with a cylindrical groove 41 and is located on the same side as the ceramic core 4. The arc interface 511 is installed in the cylindrical groove 41 with a gap to facilitate the horizontal movement of the sliding copper sheet 51 when the sliding assembly 5 is working. The gap installation can reduce the installation coaxiality requirement of the arc interface 511 and the ceramic core 4, and reduce the installation accuracy of the sliding copper sheet 51 and the ceramic core 4. Two rotating shafts 512 are symmetrically arranged inside the sliding copper sheet 51. Two rotating plates 8 are symmetrically arranged in the resistor housing 1. The rotating plates 8 are sleeved on the rotating shaft 512. One end of the rotating plate 8 is fixedly mounted on the deformation plate 61, and the other end passes through the sliding copper sheet 51. The rotating plate 8 can rotate in the horizontal direction with a limited limit. A pressure rod 81 is arranged on the side of the rotating plate 8 close to the ceramic core 4. The end of the pressure rod 81 is arranged as an arc plate 82. When the deformation plate 61 is parallel to the axis of the sliding copper sheet 51, the pressure rod 81 will apply pressure to the surface of the arc interface 511, and the arc plate 82 will wrap the arc interface 511, so that the pressure rod 81 The pressure is evenly applied to the arc interface 511, and the arc interface 511 is close to the inside of the ceramic core 4, which strengthens the transfer and dissipation of heat. After the deformation plate 61 reaches the set temperature and bends, the rotating plate 8 rotates, and the arc plate 82 leaves the surface of the arc interface 511, and no longer applies pressure to the surface of the arc interface 511. The arc interface 511 and the cylindrical groove 41 restore the clearance fit, which facilitates the movement of the sliding copper sheet 51 when the sliding component 5 is working. Under temperature changes, the pressure rod 81 and the deformation plate 61 are linked to improve the contact heat dissipation of the sliding copper sheet 51, and the sliding The installation of the copper sheet 51 and the fixing pin 62 will cause a partial position gap inside the mechanism. The gap fit of the arc interface 511 can reduce the installation accuracy of the equipment and save production costs. The two ends of the side wall of the resistor housing 1 are symmetrically provided with protective sleeves 9, which are made of insulating high-temperature resistant rubber material silicone rubber. The protective sleeves 9 wrap the welding part of the resistor lead 3 and the resistor lead 3 to prevent the resistor lead 3 from being bent and broken or the welding port from being disconnected when the electrical equipment is vibrated or shaken. This improves the service life of the resistor. ;

[0042] Working principle: When the resistor is in normal working state, the copper rod 53 fits with the resistor lead 3, the current passes through the resistor lead 3 at one end through the sliding component 5 to the resistor wire 2 and finally flows out from the resistor lead 3 at the other end, the driving spring 52 is in a contracted state, the deformation plate 61 is parallel to the axis of the sliding copper sheet 51, the fixing pin 62 is located in the locking hole 63, the locking component 6 fixes the sliding component 5, the arc plate 82 applies pressure to the arc interface 511, and the arc interface 511 is tightly attached to the inside of the ceramic core 4. When the electrical equipment has unstable voltage and the current increases instantly or is struck by lightning, causing the circuit temperature to rise, the heat transferred by the resistor lead 3 instantly reaches the set temperature, the deformation plate 61 bends toward the axis of the sliding copper sheet 51, and the deformation plate 61 with The movable fixing pin 62 leaves the locking hole 63, and the locking component 6 releases the fixation of the sliding copper sheet 51. At this time, the driving spring 52 extends, pushing the sliding copper sheet 51 to move closer to the ceramic core 4. The copper rod 53 moves with the sliding copper sheet 51 and breaks the contact with the resistor lead 3. The fixing pin 62 slides on the upper limit of the arc slope 72. When the voltage is unstable or the lightning strike disappears, the driving spring 52 contracts, and the deformation plate 61 recovers to the horizontal state from the bent state. The fixing pin 62 moves along the arc slope 72 toward the locking hole 63 under the thrust of the arc slope 72 and the deformation force of the deformation plate 61, and is finally stuck in the locking hole 63, completing the locking of the sliding component 5. The copper rod 53 contacts the resistor lead 3, and the current in the circuit flows again, and the resistor resumes normal operation.

[0043] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. An embedded high-intensity resistor, characterized in that: The invention comprises a resistor housing (1), a resistor wire (2), a resistor lead wire (3), a ceramic core (4), and a sliding component (5), wherein the ceramic core (4) is installed inside the resistor housing (1), the ceramic core (4) is arranged in a cylindrical shape and one end of the ceramic core (4) is in contact with the side wall of the resistor housing (1), the resistor lead wires (3) are symmetrically arranged on both sides of the resistor housing (1), the resistor lead wires (3) pass through the side wall of the resistor housing (1) and enter the inside of the resistor housing (1), the sliding component (5) is arranged inside the resistor housing (1), and the sliding component The component (5) is located on one side of the ceramic core (4), the sliding component (5) is slidably connected to the inner wall of the resistor housing (1), the sliding component (5) is in contact with the resistor lead (3) on one side, the resistance wire (2) is wound on the ceramic core (4), one end of the resistance wire (2) is connected to the resistor lead (3) on the other side, and the other end is connected to the sliding component (5), the resistance wire (2) is coated with an insulating layer, the sliding component (5) is separated from the contact with the resistance wire (2) by thermal expansion, and contacts with the resistance wire (2) again after cooling and shrinking.

2. The embedded high-intensity resistor according to claim 1, characterized in that: The sliding assembly (5) comprises a sliding copper sheet (51) and a driving spring (52). The sliding copper sheet (51) is slidably mounted inside the resistor housing (1). The sliding copper sheet (51) is arranged in a circular shape and the side wall of the sliding copper sheet (51) is in contact with the inner wall of the resistor housing (1). One end of the resistance wire (2) is fixedly connected to one side of the sliding copper sheet (51). A copper rod (53) is vertically mounted on one side of the sliding copper sheet (51), and the copper rod (53) is in contact with the resistor lead (3). The driving spring (52) is made of a memory metal material. The driving spring (52) extends when a set temperature is reached. A locking assembly (6) is arranged on the sliding copper sheet (51), and the locking assembly (6) controls the locking and unlocking of the sliding assembly (5) by temperature control.

3. The embedded high-intensity resistor according to claim 2, characterized in that: The driving spring (52) is sleeved on the copper rod (53) and is in contact with the copper rod (53); one side of the driving spring (52) is in contact with the inner wall of the resistor housing (1) and in contact with the resistor lead (3); and the other side is in contact with the sliding copper sheet (51).

4. The embedded high-intensity resistor according to claim 2, characterized in that: The locking assembly (6) comprises a deformation plate (61), a fixing pin (62), and a locking hole (63). Two deformation plates (61) are symmetrically mounted on the sliding copper sheet (51). The two deformation plates (61) are vertically mounted with a fixing pin (62). Two rectangular blocks (7) are symmetrically arranged on the inner wall of the resistor housing (1). The two rectangular blocks (7) are provided with a locking hole (63). The locking hole (63) is arranged as a cylindrical shallow groove. The fixing pin (62) is inserted into the locking hole (63). The deformation plate (61) is made of a bimetallic sheet. The deformation plate (61) is bent and deformed when a set temperature is reached.

5. The embedded high-intensity resistor according to claim 1, characterized in that: A circular arc interface (511) is arranged on the side of the sliding copper sheet (51) close to the ceramic core (4), and the circular arc interface (511) is composed of two symmetrical circular arc tiles. A cylindrical groove (41) is opened on one side of the ceramic core (4), and the circular arc interface (511) is installed in the cylindrical groove (41) with clearance and sliding. Two rotating shafts (512) are symmetrically arranged in the sliding copper sheet (51), and two rotating plates (8) are symmetrically arranged in the resistor housing (1). The two rotating plates (8) pass through the sliding copper sheet (51) and are rotatably connected to the rotating shafts (512). One end of the two rotating plates (8) is fixedly connected to the deformation plate (61) respectively. A pressure rod (81) is arranged on the side of the rotating plate (8) close to the ceramic core (4), and the end of the pressure rod (81) abuts against the surface of the circular arc interface (511).

6. The embedded high-intensity resistor according to claim 4, characterized in that: The rectangular block (7) is provided with a trapezoidal plate (71), one end of the trapezoidal plate (71) close to the fixing pin (62) is provided as an arc-shaped slideway (72), the end of the fixing pin (62) is provided as a semicircular shape, the end of the fixing pin (62) is slidably matched with the arc-shaped slideway (72), and when the deformable plate (61) is bent and deformed, it drives the fixing pin (62) to slide on the arc-shaped slideway (72) to an upper limit.

7. The embedded high-intensity resistor according to claim 5, characterized in that: The portion where the pressure rod (81) abuts against the surface of the arc interface (511) is provided as an arc plate (82), and the radius of the arc plate (82) is 1-2 mm smaller than the radius of the arc interface (511).

8. The embedded high-intensity resistor according to claim 1, characterized in that: Protective sleeves (9) are symmetrically arranged at both ends of the side wall of the resistor housing (1); the protective sleeves (9) wrap the welding point of the resistor lead (3) and the resistor lead (3); and the protective sleeves (9) are made of insulating high-temperature resistant rubber material.

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