CN115359981B - Thermal protection piezoresistor module - Google Patents
Thermal protection piezoresistor module Download PDFInfo
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- CN115359981B CN115359981B CN202211054508.0A CN202211054508A CN115359981B CN 115359981 B CN115359981 B CN 115359981B CN 202211054508 A CN202211054508 A CN 202211054508A CN 115359981 B CN115359981 B CN 115359981B
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- 238000002844 melting Methods 0.000 claims abstract description 27
- 230000008018 melting Effects 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 238000005538 encapsulation Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 abstract description 56
- 239000000463 material Substances 0.000 abstract description 9
- 229920000106 Liquid crystal polymer Polymers 0.000 abstract description 5
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 abstract description 5
- 239000011810 insulating material Substances 0.000 abstract description 5
- 230000005855 radiation Effects 0.000 abstract description 5
- 238000000926 separation method Methods 0.000 abstract description 5
- 238000009413 insulation Methods 0.000 abstract 1
- 238000005476 soldering Methods 0.000 description 45
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 15
- 229910000679 solder Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 13
- 238000004806 packaging method and process Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 3
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/01—Mounting; Supporting
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuses (AREA)
Abstract
The invention belongs to the technical field of piezoresistors, in particular to a thermal protection piezoresistor module which comprises a packaged piezoresistor block, a shell and a thermal protection unit arranged in the shell, wherein the shell is provided with a plurality of heat insulation layers; the thermal protection unit comprises a conductive plate, a push rod and a connecting plate; the thermal protection piezoresistor module designed by the invention has the advantages that the connecting plate and the conducting plate are components with directly raised temperature, so that the welding point with low melting point is heated and melted, the guide tube and the push rod are indirectly heated by radiation, meanwhile, the guide tube and the push rod are made of high-temperature resistant insulating materials, such as liquid crystal polymer materials, and can bear the temperature of 315 ℃ at most, even the temperature is 200 ℃, slight deformation can be generated, sliding connection between the push rod and the guide tube is not influenced, separation between the connecting plate and the conducting plate is ensured, part of heat on the connecting plate can be prevented from being transferred to the spring, and the elasticity of the spring is protected.
Description
Technical Field
The invention belongs to the technical field of piezoresistors, and particularly relates to a thermal protection piezoresistor module.
Background
The piezoresistor is welded on the circuit board, is a voltage limiting type protection device, protection equipment or an electrical product, and is converted into a working state when surge current or overvoltage occurs in a loop during working, but other problems are caused therewith; the existing piezoresistor is of a packaging structure, and is packaged into blocks through epoxy resin materials, so that heat is generated in the piezoresistor, when the temperature is too high, the temperature reaches the combustion temperature point of the piezoresistor, the piezoresistor fires and burns, and peripheral electronic components are touched, so that larger loss is caused.
According to one patent application publication CN101261893a, a thermal protection varistor module for surge protection is disclosed, which is softened by a solder joint of low-melting point solder, forces the solder joint to be rapidly broken and inserts a wedge-shaped arc extinguisher part between gaps formed at the break of the solder joint under the combined action of a pusher with a spring and a wedge-shaped arc extinguisher and a resilient conductive connecting arm, to strengthen the effect of arc extinguishing, and in which there is described "the thermal response switch assembly 16 is composed of a resilient conductive connecting arm 21, a low-melting point solder joint 29 and a first short conductive terminal 12a of an MOV 11", which resilient conductive connecting arm 21 is used for conducting a transmission current, the temperature rises when the current voltage is overloaded, and after a plurality of times of heating, the resilient conductive connecting arm 21 gradually loses elasticity, becomes smaller, the solder joint 29 melts at the low-melting point solder joint 29 and the conductive connecting arm 2 may fail to rebound, resulting in the thermal protection.
To this end, the present invention provides a thermal protection varistor module.
Disclosure of Invention
In order to overcome the deficiencies of the prior art, at least one technical problem presented in the background art is solved.
The technical scheme adopted for solving the technical problems is as follows: the invention relates to a thermal protection piezoresistor module, which comprises a packaged piezoresistor block, a shell and a thermal protection unit arranged in the shell, wherein the shell is provided with a plurality of thermal protection switches; the thermal protection unit comprises a conductive plate, a push rod and a connecting plate; the lower end face of the shell is symmetrically provided with two electric connection plates, the two electric connection plates extend into the shell, the inner ends of the electric connection plates are fixedly connected with one electric connection pin of the encapsulation piezoresistor block, the other electric connection pin of the encapsulation piezoresistor block vertically extends upwards and is embedded into a jack I at one side of the lower surface of the connecting plate, a jack is arranged in the middle position of the lower surface of the connecting plate, one end of a conducting plate is welded in the jack, the other end of the conducting plate is vertically fixedly connected with the inner end of the other electric connection plate, and a through hole is formed in the middle horizontal position of the conducting plate; guide pipes are symmetrically arranged on the lower surface of the connecting plate, the guide pipes are connected with one end of a push rod in a sliding mode through springs, the other end of one push rod vertically penetrates through the through hole and extends out of the shell, and the other push rod vertically extends out of the shell; in the invention, the lower surface of the shell is attached to the surface of the circuit board, the circuit board extrudes the push rod into the guide tube, the temperature of the conducting plate and the connecting plate is increased in an overload circuit, a low-melting point welding point between the conducting plate and the jack is melted, the low-melting point welding point is made of pollution-free metal materials, such as materials containing no lead or cadmium, the melting temperature of the low-melting point welding point is between 100 ℃ and 165 ℃, the fixing force is lost between the conducting plate and the jack, meanwhile, under the upward pushing action of a spring in the guide tube, the jack on the connecting plate is separated from one end of the conducting plate, the jack on one side of the lower surface of the connecting plate is separated from the other pin of the encapsulation piezoresistor block, the encapsulation piezoresistor block is disconnected with the conducting plate at the moment, and the circuit is in an off state, so that protection circuit function is realized; the thermal protection piezoresistor module designed by the invention has the advantages that the connecting plate and the conducting plate are components with directly raised temperature, so that the welding point with low melting point is heated and melted, the guide tube and the push rod are indirectly heated by radiation, meanwhile, the guide tube and the push rod are made of high-temperature resistant insulating materials, such as liquid crystal polymer materials, and can bear the temperature of 315 ℃ at most, even the temperature is 200 ℃, slight deformation can be generated, sliding connection between the push rod and the guide tube is not influenced, separation between the connecting plate and the conducting plate is ensured, part of heat on the connecting plate can be prevented from being transferred to the spring, and the elasticity of the spring is protected.
Preferably, a second jack is arranged on the other side of the lower surface of the connecting plate, a balance plate is arranged in the second jack, and the balance plate is vertically fixedly connected to the middle horizontal surface of the conductive plate; the jack on one side of the lower surface of the connecting plate is connected with the other electric pin of the encapsulation piezoresistor block, sliding friction exists when the jack is separated, vertical upward stable movement of the connecting plate can be influenced, the connecting plate is inclined, resistance of the jack on one side of the lower surface of the connecting plate is increased, the jack is separated from the conducting plate and is not smooth enough, the balancing plate is arranged on the conducting plate, stress at two ends of the connecting plate is even, stable and smooth upward movement is achieved, and power-off protection performance of the thermal protection piezoresistor module is guaranteed.
Preferably, a placing groove is formed in the middle of the inner top surface of the shell, and a magnetic plate is fixedly connected in the placing groove; the upper surface of the connecting plate is fixedly connected with a metal plate; even if the spring in the guide tube is extruded for a long time or is in a heating state for a long time, the spring loses part of elasticity, the metal plate can be adsorbed by the magnetic plate to drive the connecting plate to move upwards; the metal plate is an iron metal plate and is fixedly connected on the connecting plate, after the welding point with low melting point is melted, the magnetic plate adsorbs the metal plate and drives the connecting plate to be moved in the placing groove, so that the power-off thermal protection function is realized, namely, the connecting plate is pushed up by the push rod to be separated from the conductive plate, the magnetic plate adsorbs the power-off protection, or the magnetic plate adsorbs the power-off thermal protection, and the magnetic plate are separated from the power-off protection.
Preferably, two ends of the connecting plate are symmetrically and fixedly connected with guide rods respectively; the inner top surface of the shell is symmetrically provided with vertical plates, the vertical plates are provided with sliding grooves along the length direction of the vertical plates, and the guide rods are connected in the sliding grooves in a sliding manner; through the riser that sets up, the removal of guide connecting plate makes it remove to the standing groove direction along the spout steadily, further guarantees that the connecting plate steadily removes, and the guide bar is restricted in the spout simultaneously, and after this thermal protection piezoresistor module outage, the casing is taken apart to the later stage, resets the connecting plate, and the guide bar then can assist socket and conducting plate alignment welding this moment, guarantees the electric connection at effective electrically conductive position, makes things convenient for operating personnel to both welds simultaneously.
Preferably, a concave part is arranged in the middle of two sides of each power connection plate, a through fixing hole is arranged at the upper edge of the concave part, a notch is arranged at one side of the fixing hole, and an elastic plate is arranged in the concave part; the elastic plate is L-shaped, one end of the elastic plate is fixedly connected with a connecting column, the connecting column is embedded in the fixing hole, the elastic plate is embedded in the notch, and the corner position of the elastic plate is welded at the corner in the concave part; a notch is symmetrically formed in one hole edge of the fixing hole, and a limiting hole is formed in the inner surface of the notch; one end of the connecting column is provided with a convex part, the shape of the convex part is matched with that of the notch, the end face of the convex part is provided with a limit column which points to the other end of the connecting column, the convex part is embedded in the notch, and the limit column is embedded in the limit hole; the electric soldering device is characterized in that the electric soldering device is inserted into a soldering hole on a circuit board, then the electric soldering device is melted and soldered by soldering tin, manual soldering and machine soldering are generally soldered, the soldering quality of the machine is better than that of the manual soldering, the manual concentration is realized, the long-time soldering operation is difficult to avoid the problem of empty soldering or insufficient soldering, the electric soldering device is difficult to attach to the circuit board, the machine or equipment is in an operating state and drives the circuit board to vibrate at high frequency, the empty soldering or insufficient soldering of the electric soldering device can be separated from the soldering hole when serious, the elastic board is arranged on the electric soldering device, the corner position of the elastic board is soldered at the inner corner position of a concave part in an initial state, when the electric soldering device is soldered on the circuit board, soldering tin is melted at the corner position in the concave part by using electricity, at the moment, the elastic board is in the self-elastic shape, the other end of the elastic board is scraped on the circuit board, the elastic board is used as a conducting piece at the moment, and the soldering hole is communicated with the electric soldering hole, and the electric soldering device can be ensured even under the condition of empty soldering or insufficient soldering; the connection column is matched with the notch, so that the assembly of the elastic plate and the power connection plate is convenient, and the matching of the limit hole and the limit column enables the elasticity of the elastic plate to effectively act on the circuit board, ensures the elasticity of the elastic plate, and can effectively stabilize the thermal protection piezoresistor module on the circuit board; the other end of the elastic plate is scraped on the circuit board, and then the electric connection plate is welded at the welding hole position through soldering tin.
Preferably, a groove is formed in the inner corner surface of the concave part; the corner of the elastic plate is provided with a through hole; when the elastic plate is welded in the concave part, the end part of the electric soldering iron and the end part of the welding rod extend to the penetrating hole, the soldering tin is melted and solidified, and the soldering tin is convenient to flow to the inner corner position of the concave part in a melting way, so that the elastic plate is effectively welded and fixed.
Preferably, the corner positions of the elastic plate are symmetrically provided with baffle plates which are triangular and fixedly connected to the edge positions of the two sides of the elastic plate; when the elastic plate is separated from the concave part, residual molten soldering tin on the elastic plate splashes to the periphery at the moment of swinging of the elastic plate, so that the circuit board is easy to be short-circuited, and the baffle is arranged for the purpose, so that the molten soldering tin is blocked in the elastic plate at the moment of separating the elastic plate from the concave part, and the soldering tin is prevented from splashing, and the circuit board is short-circuited.
Preferably, the outer end of each power receiving plate is provided with a rotary groove, a pressing plate is arranged in the rotary groove, rotary holes are formed in two sides in the rotary groove, a pressing plate is arranged in the rotary groove, a threaded hole is formed in the middle of the pressing plate, two sides of one end of the pressing plate are fixedly connected with rotary pins, and the rotary pins are tightly connected in the rotary holes in a rotary mode; after the electric connection plates are welded, the pressing plate is rotated, so that the pressing plate rotates towards the inner sides of the two electric connection plates, then the screw threads penetrate through the threaded holes, the end parts of the screws are propped against the circuit board, and the thermal protection piezoresistor module is further fixed on the circuit board.
Preferably, screws are symmetrically arranged on two sides in the shell, one end of each screw thread penetrates through the upper surface of the shell, and the other end of each screw thread penetrates through the lower surface of the shell; according to the thickness of the circuit board, the screw is rotated, so that the circuit board extrudes the elastic board, and the other end of the elastic board is helped to be effectively scraped at the welding hole of the circuit board.
Preferably, the other end of the screw rod is fixedly connected with a rubber pad; through setting up the rubber pad, prevent that the other end of screw rod from damaging the rotatory scratch of circuit board surface, circuit board short circuit or circuit break.
The beneficial effects of the invention are as follows:
1. According to the thermal protection piezoresistor module, the connecting plate and the conducting plate are parts with the temperature being directly increased, so that the welding point with a low melting point is heated and melted, the guide tube and the push rod are indirectly heated by radiation, meanwhile, the guide tube and the push rod are made of high-temperature resistant insulating materials, such as liquid crystal polymer materials, and can bear the temperature of 315 ℃ at most, even if the temperature is 200 ℃, the temperature can be slightly deformed, the sliding connection between the push rod and the guide tube is not influenced, the separation between the connecting plate and the conducting plate is ensured, meanwhile, the heat on part of the connecting plate can be prevented from being transferred to the spring, and the elasticity of the spring is protected.
2. According to the thermal protection piezoresistor module, the upward movement of the connecting plate is balanced, and the balance plate is arranged on the conducting plate, so that the stress at two ends of the connecting plate is uniform, stable and smooth upward movement is realized, and the power-off protection performance of the thermal protection piezoresistor module is ensured.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a perspective view of a thermal protection varistor module of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a front cross-sectional view of a thermal protection varistor module of the present invention;
fig. 4 is a perspective view of a power board according to the present invention;
Fig. 5 is a front view of the power board of the present invention;
FIG. 6 is a perspective view of an elastic plate according to the present invention;
FIG. 7 is a view showing the fit of the screw to the housing in the present invention;
In the figure: the voltage-dependent resistor block 001, the shell 1, the conducting plate 2, the push rod 3, the connecting plate 4, the electric connection plate 5, the electric connection pin 6, the first jack 7, the jack 8, the guide tube 9, the spring 10, the second jack 11, the balance plate 12, the magnetic plate 13, the metal plate 14, the guide rod 15, the vertical plate 16, the concave part 17, the fixing hole 18, the notch 19, the elastic plate 20, the connecting column 21, the notch 22, the limiting hole 23, the convex part 24, the limiting column 25, the groove 26, the through hole 27, the baffle 28, the rotary groove 29, the pressing plate 30, the threaded hole 31, the rotary hole 32, the screw 33 and the rubber pad 34 are packaged.
Detailed Description
The invention is further described in connection with the following detailed description in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
Embodiment one:
Referring to fig. 1, 2 and 3, a thermal protection varistor module includes a packaged varistor block 001, a case 1, and a thermal protection unit disposed within the case 1; the thermal protection unit comprises a conductive plate 2, a push rod 3 and a connecting plate 4; the lower end face of the shell 1 is symmetrically provided with two electric connection plates 5, the two electric connection plates 5 extend into the shell 1, the inner end of each electric connection plate 5 is fixedly connected with one electric connection pin 6 of the encapsulation piezoresistor block 001, the other electric connection pin 6 of the encapsulation piezoresistor block 001 extends vertically upwards and is embedded into a jack I7 at one side of the lower surface of the connecting plate 4, a jack 8 is arranged in the middle position of the lower surface of the connecting plate 4, one end of a conductive plate 2 is welded in the jack 8, the other end of the conductive plate 2 is vertically fixedly connected with the inner end of the other electric connection plate 5, and a through hole is formed in the middle horizontal position of the conductive plate 2; guide pipes 9 are symmetrically arranged on the lower surface of the connecting plate 4, the guide pipes 9 are connected with one end of the push rod 3 in a sliding mode through springs 10, the other end of one push rod 3 vertically penetrates through the through hole and extends out of the shell 1, and the other push rod 3 vertically extends out of the shell 1; in the invention, the lower surface of a shell 1 is attached to the surface of a circuit board, the circuit board extrudes a push rod 3 into a guide tube 9, the temperature of a conducting plate 2 and a connecting plate 4 is increased in an overload circuit, a low-melting point welding point between the conducting plate 2 and a socket 8 is melted, the low-melting point welding point is made of a pollution-free metal material, such as a material which does not contain lead or cadmium, and the like, the melting temperature of the low-melting point welding point is between 100 ℃ and 165 ℃, the fixing force is lost between the conducting plate 2 and the socket 8, meanwhile, under the upward pushing action of a spring 10 in the guide tube 9, the socket 8 on the connecting plate 4 is separated from one end of the conducting plate 2, a first jack 7 on one side of the lower surface of the connecting plate 4 is separated from another power pin 6 of a packaging piezoresistor block 001, the packaging piezoresistor block 001 is disconnected with the conducting plate 2, and the circuit is in a disconnected state, so that circuit protection function is realized; the thermal protection piezoresistor module designed by the invention has the advantages that the connecting plate 4 and the conducting plate 2 are temperature direct rising parts, so that the low-melting-point welding points are heated and melted, the guide tube 9 and the push rod 3 are indirectly heated by radiation, meanwhile, the guide tube 9 and the push rod 3 are made of high-temperature resistant insulating materials, such as liquid crystal polymer materials, which can bear the temperature of 315 ℃ at the maximum, only slightly deform even at 200 ℃, the sliding connection between the push rod 3 and the guide tube 9 is not influenced, the separation between the connecting plate 4 and the conducting plate 2 is ensured, part of heat on the connecting plate 4 can be prevented from being transferred to the spring 10, and the elasticity of the spring 10 is also protected.
Referring to fig. 1 and 3, a second jack 11 is arranged on the other side of the lower surface of the connecting plate 4, a balance plate 12 is arranged in the second jack 11, and the balance plate 12 is vertically fixedly connected to the middle horizontal surface of the conductive plate 2; the connecting plate 4 is jacked on two stand pipes 9, jack one 7 on one side of the lower surface of connecting plate 4 is connected with another electric pin 6 of encapsulation piezoresistor block 001, this electric pin 6 has sliding friction when breaking away from jack one 7, can influence the vertical steady removal upwards of connecting plate 4 this moment, lead to connecting plate 4 crooked, the resistance increase that jack one 7 on one side of connecting plate 4 breaks away from electric pin 6, jack 8 breaks away from conducting plate 2 is not smooth enough, for this purpose the upward movement of balanced connecting plate 4, set up balanced board 12 on conducting plate 2, make connecting plate 4 both ends atress even, steady and smooth upward movement, guarantee the outage protection performance of thermal protection piezoresistor module.
Referring to fig. 1 and 2, a placement groove is formed in the middle of the inner top surface of the shell 1, and a magnetic plate 13 is fixedly connected in the placement groove; the upper surface of the connecting plate 4 is fixedly connected with a metal plate 14; even if the spring 10 in the guide pipe 9 is extruded for a long time or is in a heating state for a long time, the spring 10 loses part of elasticity, the metal plate 14 can be adsorbed by the magnetic plate 13 to drive the connecting plate 4 to move upwards; the metal plate 14 is an iron metal plate 14 and is fixedly connected to the connecting plate 4, after the low-melting point welding point is melted, the magnetic plate 13 adsorbs the metal plate 14 to drive the connecting plate 4 to be moved upwards and placed in the placing groove, so that the power-off thermal protection function is realized, namely, the connecting plate 4 is pushed up by the push rod 3 to be separated from the conductive plate 2, the magnetic plate 13 adsorbs the power-off protection, or the two power-off thermal protection functions are simultaneously separated from the power-off thermal protection.
Referring to fig. 1 and 2, two ends of the connecting plate 4 are symmetrically and fixedly connected with guide rods 15 respectively; the inner top surface of the shell 1 is symmetrically provided with a vertical plate 16, the vertical plate 16 is provided with a chute along the length direction, and a guide rod 15 is slidably connected in the chute; through the riser 16 that sets up, the removal of guide connecting plate 4 makes it steadily remove to the standing groove direction along the spout, further guarantees that connecting plate 4 steadily removes, and guide bar 15 is restricted in the spout simultaneously, and after this thermal protection piezoresistor module outage, later stage unpacks casing 1, resets connecting plate 4, and the guide bar 15 then can assist socket 8 and conductive plate 2 alignment welding this moment, guarantees the electric connection of effective electrically conductive position, makes things convenient for operating personnel to both welds simultaneously.
Referring to fig. 4 and 6, a concave portion 17 is formed in the middle position of two sides of each of the power receiving plates 5, a through fixing hole 18 is formed in the upper edge of the concave portion 17, a notch 19 is formed in one side of the fixing hole 18, and an elastic plate 20 is arranged in the concave portion 17; the elastic plate 20L is shaped, one end of the elastic plate 20 is fixedly connected with a connecting column 21, the connecting column 21 is embedded in the fixing hole 18, the elastic plate 20 is embedded in the notch 19, and the corner position of the elastic plate 20 is welded at the inner corner of the concave part 17; a notch 22 is symmetrically formed at the edge of one hole of the fixed hole 18, and a limiting hole 23 is formed in the inner surface of the notch 22; one end of the connecting column 21 is provided with a convex part 24, the shape of the convex part 24 is matched with that of the notch 22, the end face of the convex part 24 is provided with a limit column 25, the limit column 25 points to the other end of the connecting column 21, the convex part 24 is embedded in the notch 22, and the limit column 25 is embedded in the limit hole 23; the electric board 5 is inserted into a welding hole on a circuit board, then the electric board 5 is welded by soldering tin melting, manual welding and machine welding are generally welded, the welding quality of the machine is better than that of the manual welding, the manual concentration is realized, the long-time welding operation is carried out, the problem of empty welding or false welding can not occur easily, the electric board 5 is difficult to attach to the circuit board, the machine or equipment is in an operating state and drives the circuit board to vibrate at high frequency, the empty welding or false welding electric board 5 can be vibrated to be separated from the welding hole when serious, the elastic board 20 is arranged on the electric board 5, the corner position of the elastic board 20 is welded at the inner corner position of the concave part 17 in an initial state, when the electric board 5 is welded on the circuit board, the electric soldering iron is used for melting the corner position of the concave part 17, the elastic board 20 is in an elastic shape, the other end of the elastic board 20 is taken over on the circuit board, the elastic board 20 is used as a conducting piece at the moment, and the welding hole is communicated with the electric board 5 even if the empty welding or the false welding is carried out, and the electrization between the electric board 5 and the welding hole can be ensured; the connection column 21 is matched with the notch 19, so that the assembly of the elastic plate 20 and the power connection plate 5 is convenient, and the matching of the limit holes 23 and the limit columns 25 ensures that the elasticity of the elastic plate 20 can effectively act on the circuit board, the elasticity of the elastic plate 20 is ensured, and the thermal protection piezoresistor module can be effectively stabilized on the circuit board; the other end of the elastic plate 20 is scraped against the circuit board, and then the electric connection plate 5 is soldered to the soldering hole position by solder.
Referring to fig. 1, 3 and 6, the inner corner surface of the concave portion 17 is provided with a groove 26, and the corner position of the elastic plate 20 is provided with a through hole 27; when the elastic plate 20 is welded on the concave portion 17, the end portion of the electric soldering iron and the end portion of the welding rod extend to the position of the through hole 27, the soldering tin is melted and solidified, and the soldering tin can flow to the inner corner position of the concave portion 17 conveniently, so that the elastic plate 20 is effectively welded and fixed.
Referring to fig. 6, the corner positions of the elastic plate 20 are symmetrically provided with a baffle 28, and the baffle 28 is triangular and fixedly connected to the edge positions of two sides of the elastic plate 20; when the elastic plate 20 is separated from the concave portion 17, the residual molten solder on the elastic plate 20 splashes to the periphery at the moment of swinging of the elastic plate 20, and thus the circuit board is easily short-circuited, and therefore, the baffle 28 is arranged, and the baffle 28 blocks the molten solder in the elastic plate 20 at the moment of separating the elastic plate 20 from the concave portion 17, so that the splashing of the solder is prevented, and the short circuit of components on the circuit board is prevented.
Referring to fig. 4 and 5, the outer end of each power receiving plate 5 is provided with a rotary groove 29, a pressing plate 30 is arranged in the rotary groove 29, rotary holes 32 are formed in two sides of the rotary groove 29, the pressing plate 30 is arranged in the rotary groove 29, a threaded hole 31 is formed in the middle of the pressing plate 30, a rotating pin is fixedly connected to two sides of one end of the pressing plate 30, and the rotating pin is tightly connected in the rotary holes 32 in a rotating manner; after the power connection plates 5 are welded, the pressing plate 30 is rotated, so that the pressing plate 30 rotates towards the inner sides of the two power connection plates 5, then the threaded holes 31 are penetrated through by screw threads, the end parts of the screws are propped against the circuit board, and the thermal protection piezoresistor module is further fixed on the circuit board.
Embodiment two:
Referring to fig. 7, in a first comparative example, as another embodiment of the present invention, screws 33 are symmetrically disposed at both sides of the inside of the housing 1, one end of each screw 33 is threaded through the upper surface of the housing 1, and the other end of each screw 33 is threaded through the lower surface of the housing 1; the screw 33 is rotated according to the thickness of the circuit board so that the circuit board presses the elastic plate 20, facilitating the other end of the elastic plate 20 to be effectively caught at the soldering hole position of the circuit board.
The other end of the screw 33 is fixedly connected with a rubber pad 34; by arranging the rubber pad 34, the other end of the screw 33 is prevented from rotating, scratching and damaging the surface of the circuit board, and the circuit board is short-circuited or broken.
Working principle: in the invention, the lower surface of a shell 1 is attached to the surface of a circuit board, the circuit board extrudes a push rod 3 into a guide tube 9, the temperature of a conducting plate 2 and a connecting plate 4 is increased in an overload circuit, a low-melting point welding point between the conducting plate 2 and a socket 8 is melted, the low-melting point welding point is made of a pollution-free metal material, such as a material which does not contain lead or cadmium, and the like, the melting temperature of the low-melting point welding point is between 100 ℃ and 165 ℃, the fixing force is lost between the conducting plate 2 and the socket 8, meanwhile, under the upward pushing action of a spring 10 in the guide tube 9, the socket 8 on the connecting plate 4 is separated from one end of the conducting plate 2, a first jack 7 on one side of the lower surface of the connecting plate 4 is separated from another power pin 6 of a packaging piezoresistor block 001, the packaging piezoresistor block 001 is disconnected with the conducting plate 2, and the circuit is in a disconnected state, so that circuit protection function is realized; the thermal protection piezoresistor module designed by the invention has the advantages that the connecting plate 4 and the conducting plate 2 are temperature direct rising parts, so that the low-melting-point welding point is heated and melted, the guide tube 9 and the push rod 3 are indirectly heated by radiation, meanwhile, the guide tube 9 and the push rod 3 are made of high-temperature resistant insulating materials, such as liquid crystal polymer materials, which can bear the temperature of 315 ℃ at the highest, and can only slightly deform even at 200 ℃, so that the sliding connection between the push rod 3 and the guide tube 9 is not influenced, the separation between the connecting plate 4 and the conducting plate 2 is ensured, and meanwhile, the heat on the connecting plate 4 can be prevented from being transferred to the spring 10, and the elasticity of the spring 10 is also protected;
The connecting plate 4 is jacked on the two guide pipes 9, the jack I7 on one side of the lower surface of the connecting plate 4 is connected with the other electric pin 6 of the packaging piezoresistor block 001, when the electric pin 6 is separated from the jack, sliding friction is generated, the vertical upward stable movement of the connecting plate 4 is influenced, the deflection of the connecting plate 4 is caused, the resistance of the jack I7 on one side of the lower surface of the connecting plate 4 separated from the electric pin 6 is increased, the jack 8 is not smooth enough to separate from the conducting plate 2, the upward movement of the connecting plate 4 is balanced, and the balance plate 12 is arranged on the conducting plate 2, so that the stress at two ends of the connecting plate 4 is uniform, stable and smooth, and the power-off protection performance of the thermal protection piezoresistor module is ensured;
The upper surface of the connecting plate 4 is fixedly connected with a metal plate 14; even if the spring 10 in the guide pipe 9 is extruded for a long time or is in a heating state for a long time, the spring 10 loses part of elasticity, the metal plate 14 can be adsorbed by the magnetic plate 13 to drive the connecting plate 4 to move upwards; the metal plate 14 is an iron metal plate 14 and is fixedly connected to the connecting plate 4, after the low-melting point welding point is melted, the magnetic plate 13 adsorbs the metal plate 14 to drive the connecting plate 4 to be moved upwards and placed in the placing groove, so that the power-off thermal protection function is realized, namely, the connecting plate 4 is pushed up by the push rod 3 to be separated from the conductive plate 2, and the magnetic plate 13 adsorbs the power-off protection, or the two are separated from the power-off protection simultaneously;
through the vertical plate 16, the movement of the connecting plate 4 is guided, so that the connecting plate 4 can move along the chute smoothly towards the direction of the placing chute, the smooth movement of the connecting plate 4 is further ensured, meanwhile, the guide rod 15 is limited in the chute, after the thermal protection piezoresistor module is powered off, the shell 1 is disassembled at a later stage, the connecting plate 4 is reset, and the guide rod 15 at the moment can assist the socket 8 to be aligned and welded with the conducting plate 2, so that the electric connection of effective conducting parts is ensured, and meanwhile, the welding of the socket and the conducting plate is convenient for operators;
The electric board 5 is inserted into a welding hole on a circuit board, then the electric board 5 is welded by soldering tin melting, manual welding and machine welding are generally welded, the welding quality of the machine is better than that of the manual welding, the manual concentration is realized, the long-time welding operation is carried out, the problem of empty welding or false welding can not occur easily, the electric board 5 is difficult to attach to the circuit board, the machine or equipment is in an operating state and drives the circuit board to vibrate at high frequency, the empty welding or false welding electric board 5 can be vibrated to be separated from the welding hole when serious, the elastic board 20 is arranged on the electric board 5, the corner position of the elastic board 20 is welded at the inner corner position of the concave part 17 in an initial state, when the electric board 5 is welded on the circuit board, the electric soldering iron is used for melting the corner position of the concave part 17, the elastic board 20 is in an elastic shape, the other end of the elastic board 20 is taken over on the circuit board, the elastic board 20 is used as a conducting piece at the moment, and the welding hole is communicated with the electric board 5 even if the empty welding or the false welding is carried out, and the electrization between the electric board 5 and the welding hole can be ensured; the connection column 21 is matched with the notch 19, so that the assembly of the elastic plate 20 and the power connection plate 5 is convenient, and the matching of the limit holes 23 and the limit columns 25 ensures that the elasticity of the elastic plate 20 can effectively act on the circuit board, the elasticity of the elastic plate 20 is ensured, and the thermal protection piezoresistor module can be effectively stabilized on the circuit board; the other end of the elastic plate 20 is scraped on the circuit board, and then the electric connection plate 5 is welded at the welding hole position through soldering tin;
when the elastic plate 20 is welded on the concave part 17, the end part of the electric soldering iron and the end part of the welding rod extend to the position of the through hole 27, the soldering tin is melted and solidified, and the soldering tin is convenient to flow to the inner corner position of the concave part 17, so that the elastic plate 20 is effectively welded and fixed;
When the elastic plate 20 is separated from the concave part 17, residual molten solder on the elastic plate 20 splashes to the periphery at the moment of swinging of the elastic plate 20, and short circuit of the circuit board is easily caused, therefore, the baffle 28 is arranged, and the baffle 28 blocks the molten solder in the elastic plate 20 at the moment of separating the elastic plate 20 from the concave part 17, so that the splashing of the solder is prevented, and the short circuit of components on the circuit board is caused; after the power connection plates 5 are welded, the pressing plate 30 is rotated, so that the pressing plate 30 rotates towards the inner sides of the two power connection plates 5, then the threaded holes 31 are penetrated through by screw threads, the end parts of the screws are propped against the circuit board, and the thermal protection piezoresistor module is further fixed on the circuit board.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A thermal protection varistor module comprising a packaged varistor block (001), characterized in that: the device also comprises a shell (1) and a thermal protection unit arranged in the shell (1); the thermal protection unit comprises a conductive plate (2), a push rod (3) and a connecting plate (4); the lower end face of the shell (1) is symmetrically provided with two power connection plates (5), the two power connection plates (5) extend into the shell (1), the inner end of each power connection plate (5) is fixedly connected with one power connection pin (6) of the encapsulation piezoresistor block (001), the other power connection pin (6) of the encapsulation piezoresistor block (001) vertically extends upwards and is embedded into a jack I (7) at one side of the lower surface of the connecting plate (4), a jack (8) is arranged in the middle position of the lower surface of the connecting plate (4), one end of a conductive plate (2) is welded at a low melting point in the jack (8), the other end of the conductive plate (2) is vertically fixedly connected with the inner end of the other power connection plate (5), and a through hole is formed in the middle horizontal position of the conductive plate (2); guide pipes (9) are symmetrically arranged on the lower surface of the connecting plate (4), the guide pipes (9) are connected with one end of the push rod (3) in a sliding mode through springs (10), the other end of one push rod (3) vertically penetrates through the through hole and extends out of the shell (1), and the other push rod (3) vertically extends out of the shell (1);
The other side of the lower surface of the connecting plate (4) is provided with a second jack (11), a balance plate (12) is arranged in the second jack (11), and the balance plate (12) is vertically fixedly connected to the middle horizontal surface of the conducting plate (2).
2. The thermal protection varistor module of claim 1, wherein: a placing groove is formed in the middle of the inner top surface of the shell (1), and a magnetic plate (13) is fixedly connected in the placing groove; an iron metal plate (14) is fixedly connected to the upper surface of the connecting plate (4).
3. A thermally protected piezoresistor module as set forth in claim 2 wherein: guide rods (15) are symmetrically and fixedly connected to two ends of the connecting plate (4); the top surface symmetry is equipped with riser (16) in casing (1), sets up the spout along its length direction on riser (16), guide bar (15) sliding connection in the spout.
4. The thermal protection varistor module of claim 1, wherein: a concave part (17) is formed in the middle position of two sides of each power receiving plate (5), a through fixing hole (18) is formed in the upper edge of each concave part (17), a notch (19) is formed in one side of each fixing hole (18), and an elastic plate (20) is arranged in each concave part (17); the elastic plate (20) is L-shaped, one end of the elastic plate (20) is fixedly connected with a connecting column (21), the connecting column (21) is embedded in the fixing hole (18), the elastic plate (20) is embedded in the notch (19), and the corner position of the elastic plate (20) is welded at the inner corner of the concave part (17); a notch (22) is symmetrically formed at the edge of one hole of the fixed hole (18), and a limit hole (23) is formed in the inner surface of the notch (22); one end of the connecting column (21) is provided with a convex part (24), the shape of the convex part (24) is matched with that of the notch (22), the end face of the convex part (24) is provided with a limit column (25), the limit column (25) points to the other end of the connecting column (21), the convex part (24) is embedded in the notch (22), and the limit column (25) is embedded in the limit hole (23).
5. The thermal protection varistor module of claim 4, wherein: the inner corner surface of the concave part (17) is provided with a groove (26), and the corner position of the elastic plate (20) is provided with a through hole (27).
6. The thermal protection varistor module of claim 5, wherein: baffle plates (28) are symmetrically arranged at the corner positions of the elastic plate (20), and the baffle plates (28) are triangular and fixedly connected to the edge positions of the two sides of the elastic plate (20).
7. The thermal protection varistor module of claim 4, wherein: the outer end of each power receiving plate (5) is provided with a rotary groove (29), a pressing plate (30) is arranged in the rotary groove (29), rotary holes (32) are formed in two sides in the rotary groove (29), the rotary groove (29) is internally provided with the pressing plate (30), the middle position of the pressing plate (30) is provided with a threaded hole (31), two sides of one end of the pressing plate (30) are fixedly connected with rotary pins, and the rotary pins are tightly connected in the rotary holes (32) in a rotary mode.
8. A thermally protected piezoresistor module as set forth in claim 3 wherein: screw rods (33) are symmetrically arranged on two sides in the shell (1), one end thread of each screw rod (33) penetrates through the upper surface of the shell (1), and the other end thread of each screw rod (33) penetrates through the lower surface of the shell (1).
9. The thermal protection varistor module of claim 8, wherein: the other end of the screw rod (33) is fixedly connected with a rubber pad (34).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211054508.0A CN115359981B (en) | 2022-09-06 | 2022-09-06 | Thermal protection piezoresistor module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211054508.0A CN115359981B (en) | 2022-09-06 | 2022-09-06 | Thermal protection piezoresistor module |
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| CN115359981B true CN115359981B (en) | 2024-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1493455A (en) * | 1974-06-10 | 1977-11-30 | Matsushita Electric Ind Co Ltd | Electrical surge absorber devices |
| DE4219304A1 (en) * | 1992-06-12 | 1993-12-23 | Roederstein Kondensatoren | Reliable overcurrent protection component with a small footprint and simple construction |
| JP2012109078A (en) * | 2010-11-16 | 2012-06-07 | Otowa Denki Kogyo Kk | Spd with separator |
| CN212934289U (en) * | 2020-08-04 | 2021-04-09 | 福建省乔光电子科技有限公司 | Thermal protection type piezoresistor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100566056C (en) * | 2004-04-19 | 2009-12-02 | 苏勒过压保护公司 | Surge-voltage protection with improved disconnecting members and visual indicating device |
-
2022
- 2022-09-06 CN CN202211054508.0A patent/CN115359981B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1493455A (en) * | 1974-06-10 | 1977-11-30 | Matsushita Electric Ind Co Ltd | Electrical surge absorber devices |
| DE4219304A1 (en) * | 1992-06-12 | 1993-12-23 | Roederstein Kondensatoren | Reliable overcurrent protection component with a small footprint and simple construction |
| JP2012109078A (en) * | 2010-11-16 | 2012-06-07 | Otowa Denki Kogyo Kk | Spd with separator |
| CN212934289U (en) * | 2020-08-04 | 2021-04-09 | 福建省乔光电子科技有限公司 | Thermal protection type piezoresistor |
Non-Patent Citations (1)
| Title |
|---|
| 双功能熔断电阻器;石永杰;电子元件与材料;19940828(04);第1-7页 * |
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