CN221057216U - Piezoresistor with thermal protection function - Google Patents
Piezoresistor with thermal protection function Download PDFInfo
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- CN221057216U CN221057216U CN202322806774.0U CN202322806774U CN221057216U CN 221057216 U CN221057216 U CN 221057216U CN 202322806774 U CN202322806774 U CN 202322806774U CN 221057216 U CN221057216 U CN 221057216U
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- 238000000034 method Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 2
- 230000003068 static effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 5
- 239000004065 semiconductor Substances 0.000 abstract description 4
- 230000001419 dependent effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model discloses a piezoresistor with a thermal protection function, which comprises a shell and a piezoresistor arranged in the shell, wherein the piezoresistor is provided with a first lead-out pin and a second lead-out pin, the shell is provided with a third lead-out pin, a support frame is arranged between the first lead-out pin and the third lead-out pin, and the support frame is provided with an opening and closing component and is abutted against the first lead-out pin and the third lead-out pin to enable a circuit of the first lead-out pin and the third lead-out pin to be communicated. The bimetallic strip pushes the opening and closing assembly to move, so that the circuit connection between the first leading-out pin and the third leading-out pin is cut off, the piezoresistor is prevented from being invalid due to overheat of the piezoresistor and damage to semiconductor materials in the piezoresistor, and when the temperature falls back into the bearable range of the piezoresistor, the bimetallic strip and the opening and closing assembly reset, so that the circuit connection between the first leading-out pin and the third leading-out pin is realized, and the product has the advantages of thermal protection function, automatic reset and the like.
Description
Technical Field
The utility model relates to the technical field of resistors, in particular to a piezoresistor with a thermal protection function.
Background
The voltage dependent resistor is a voltage limiting element which is sensitive to voltage change, when the voltage exceeds a certain critical value at a specified temperature, the resistance value of the voltage dependent resistor is suddenly reduced, the current passing through the voltage dependent resistor is suddenly increased, the voltage and the current are not in a linear relation, and the voltage dependent resistor is installed in the current general household appliance as a lightning protection and surge current prevention device along with the enhancement of the safety consciousness of people, so that the electric appliance is safer in the use process.
When the traditional piezoresistor is used, when overvoltage and overcurrent occur, the semiconductor material in the piezoresistor is overheated, so that the piezoresistor is burnt out, and the high-temperature piezoresistor can possibly ignite nearby inflammable substances, so that open fire occurs, and finally fire can possibly be caused. The inventors have thus devised an advantageous design to find a solution to the above-mentioned problems, and the technical solutions described below are created in this context.
Disclosure of Invention
The utility model aims to overcome the defects of the traditional piezoresistor design and provides a product with a thermal protection function and automatic resetting.
In order to solve the problems, the utility model adopts the following technical scheme.
The utility model provides a piezo-resistor with thermal protection function, includes the casing, and sets up the piezo-resistor in the casing, the piezo-resistor is equipped with first pin, second pin, the casing is equipped with the third pin, the casing is equipped with braced frame between first pin, third pin, braced frame is equipped with the subassembly that opens and shuts to butt first pin, third pin make the circuit intercommunication of first pin and third pin, the casing is equipped with bimetallic strip to butt subassembly that opens and shuts, and be connected with first pin for when the piezo-resistor temperature is higher, promote the subassembly activity that opens and shuts, break the circuit connection of first pin and third pin.
Preferably, the casing is provided with a fixed frame, the bimetallic strip is fixedly arranged on the fixed frame, the casing is provided with an end cover, and the end cover is provided with a bump and is abutted against the piezoresistor.
Preferably, the bimetal comprises a driving piece and a driven piece, the driving piece is connected with the driven piece through a welding process, the driving piece is provided with a first extension plate, and the driving piece is connected with the first leading-out pin through the welding process.
Preferably, the first pin and the third pin are provided with second extension plates, the second extension plates are in vertical relation with the first pin and the third pin, the second extension plates are provided with dead points, and the third pin penetrates through the shell and is exposed outside the shell.
Preferably, a limiting groove is formed in the side wall of the supporting frame, and a first guide pillar is arranged in the limiting groove.
Preferably, the opening and closing assembly comprises a push rod, springs, moving plates and moving points, wherein ejector blocks are arranged on two sides of the push rod and are arranged in the limiting groove, the ejector blocks are provided with second guide posts, the push rod is provided with a contact rod and is abutted to the driving plate, the moving plates are connected with the end faces of the push rod through a hot riveting process, the moving plates are arranged on two sides of the moving plates, and the springs are arranged between the first guide posts and the second guide posts and act on the ejector blocks to enable the moving points to be abutted to the static points.
The beneficial effects are that:
Compared with the prior art, the utility model has the beneficial effects that:
When overvoltage and overcurrent occur in the piezoresistor, the voltage-dependent resistor is high Wen Shidi, namely the first lead-out pin, the second lead-out pin and the third lead-out pin generate heat, the first lead-out pin is thermally conducted to the first extension plate, so that the driving plate is heated and deformed, the contact rod is pushed to move, the top block moves towards the other end of the limit groove, the spring is in an energy storage state, the moving point is far away from the dead point, the circuit connection between the first lead-out pin and the third lead-out pin is cut off, the semiconductor material in the piezoresistor is prevented from being heated and damaged due to the overvoltage and the overcurrent, the piezoresistor is effectively protected, the service life of the piezoresistor is prolonged, and meanwhile, other components of a circuit of the section are protected; when the temperature of the piezoresistor falls back to the standard range, the driven piece is pulled back to the initial position due to the fact that the thermal expansion coefficient of the driven piece is lower than that of the driving piece, the push rod losing resistance is pulled back, the spring releases counterforce to push the top block and the push rod to reset, the circuit between the first leading-out pin and the third leading-out pin is communicated, normal use of the circuit is restored, and the product has the advantages of thermal protection function, automatic reset and the like.
Drawings
FIG. 1 is a schematic diagram of a varistor with thermal protection according to the present utility model;
FIG. 2 is a schematic side sectional view of a varistor with thermal protection according to the present utility model;
FIG. 3 is a top view showing the internal structure of a varistor with thermal protection function according to the present utility model;
FIG. 4 is an enlarged view showing a partial structure of a detail A of the varistor with thermal protection of FIG. 3 according to the present utility model;
the correspondence between the reference numerals and the component names in the drawings is as follows:
Reference numerals: 1. a housing; 2. a piezoresistor; 3. an opening and closing assembly; 4. bimetallic strips; 5. a second extension plate; 11. a third pin; 12. a support frame; 13. a fixed frame; 14. an end cap; 15. a bump; 121. a limit groove; 122. a first guide post; 21. a first lead-out pin; 22. a second lead-out pin; 31. a push rod; 32. a spring; 33. a moving plate; 34. a moving point; 35. a top block; 36. a second guide post; 37. a contact lever; 41. a driving plate; 42. a passive plate; 43. a first extension plate; 51. a dead point.
Detailed Description
The technical solutions of the present utility model will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Referring to fig. 1 to 4, a varistor with thermal protection function includes a casing 1, and a varistor 2 disposed in the casing 1, wherein the varistor 2 is provided with a first lead-out pin 21 and a second lead-out pin 22, and is characterized in that: the shell 1 is provided with a third lead-out pin 11, the shell 1 is provided with a support frame 12 between the first lead-out pin 21 and the third lead-out pin 11, the support frame 12 is provided with an opening and closing component 3 and is abutted against the first lead-out pin 21 and the third lead-out pin 11 to enable the first lead-out pin 21 to be communicated with a circuit of the third lead-out pin 11, the shell 1 is provided with a bimetallic strip 4 and is abutted against the opening and closing component 3 and connected with the first lead-out pin 21, and the bimetallic strip is used for pushing the opening and closing component 3 to move when the temperature of the piezoresistor 2 is higher to interrupt the circuit connection of the first lead-out pin 21 and the third lead-out pin 11;
It should be noted that the casing 1 is provided with a fixed frame 13, the bimetallic strip 4 is fixedly arranged on the fixed frame 13, the casing 1 is provided with an end cover 14, the end cover 14 is provided with a bump 15 and is abutted against the piezoresistor 2, the fixed frame 13 provides a supporting function for the bimetallic strip 4, the end cover 14 plays a role in protecting the opening and closing assembly 3, the bimetallic strip 4 and the piezoresistor 2, the bump 15 prevents the piezoresistor 2 from shaking in the casing 1, and the anti-falling capability is improved;
It should be noted that, the bimetal 4 includes a driving plate 41 and a driven plate 42, the driving plate 41 is connected with the driven plate 42 through a welding process, the driving plate 41 is provided with a first extension plate 43, the driving plate 41 is connected with the first lead-out pin 21 through a welding process, the thermal expansion coefficient of the driving plate 41 is greater than that of the driven plate 42, and the first extension plate 43 plays a role of absorbing heat of the first lead-out pin 21, so that the driving plate 41 is deformed;
It should be noted that the first lead-out pin 21 and the third lead-out pin 11 are provided with a second extension plate 5, the second extension plate 5 is in a vertical relation with the first lead-out pin 21 and the third lead-out pin 11, the second extension plate 5 is provided with a dead point 51, the third lead-out pin 11 passes through the shell 1 and is exposed outside the shell 1, the second extension plate 5 is matched with the dead point 51 for use, and the dead point 51 bears current and voltage to pass through;
It should be noted that, the side wall of the supporting frame 12 is provided with a limit groove 121, the limit groove 121 is provided with a first guide post 122, the limit groove 121 limits the moving range of the push rod 31, and the first guide post 122 prevents the spring 32 from falling off;
It should be noted that, the opening and closing assembly 3 includes a push rod 31, a spring 32, a moving plate 33 and a moving point 34, two sides of the push rod 31 are provided with a top block 35 and are arranged in a limiting groove 121, the top block 35 is provided with a second guide post 36, the push rod 31 is provided with a contact rod 37 and is abutted against a driving plate 41, the moving plate 33 is connected with the end face of the push rod 31 through a hot riveting process, the moving plate 33 is arranged at two sides of the moving plate 33, the spring 32 is arranged between the first guide post 122 and the second guide post 36 and acts on the top block 35, the moving point 34 is abutted against a dead point 51, the push rod 31 is made of an insulating material, the acting force of the spring 32 is transmitted to the push rod 31 through the top block 35, the second guide post 36 prevents the spring 32 from falling off, the contact rod 37 is matched with the driving plate 41 for use, the material of the push rod 31 is melted through hot riveting, the moving plate 33 is further connected with the push rod 31 more stably, and the moving point 34 and the moving plate 33 play a role of bearing current and voltage.
The principle of use of the utility model will now be described as follows:
When the piezoresistor 2 generates overvoltage and overcurrent, the first lead-out pin 21, the second lead-out pin 22 and the third lead-out pin 11 are high Wen Shidi, the first lead-out pin 21 is thermally conducted to the first extension plate 43, so that the driving plate 41 is heated and deformed, the contact rod 37 is pushed to move, the top block 35 moves towards the other end direction of the limiting groove 121, the spring 32 is in an energy storage state, the moving point 34 is far away from the dead point 51, the circuit connection between the first lead-out pin 21 and the third lead-out pin 11 is cut off, the semiconductor material inside the piezoresistor 2 is prevented from being heated and damaged due to the overvoltage and the overcurrent, the piezoresistor 2 is effectively protected and the service life of the piezoresistor is prolonged, and meanwhile, other components of the circuit in the circuit are protected;
When the temperature of the piezoresistor 2 falls back to the standard range, the thermal expansion coefficient of the passive plate 42 is lower than that of the active plate 41, so that the active plate 41 is pulled back to the initial position, the push rod 31 losing resistance is released, the spring 32 releases the counterforce to push the top block 35 and the push rod 31 to reset, the circuit between the first leading-out pin 21 and the third leading-out pin 11 is communicated, and the normal use of the circuit is restored.
Through the design scheme, the product has the advantages of thermal protection function and automatic reset.
The foregoing is a further elaboration of the present utility model in connection with the detailed description, and it is not intended that the utility model be limited to the specific embodiments shown, but rather that a number of simple deductions or substitutions be made by one of ordinary skill in the art without departing from the spirit of the utility model, should be considered as falling within the scope of the utility model as defined in the appended claims.
Claims (6)
1. The utility model provides a piezo-resistor with thermal protection function, includes casing (1), and sets up piezo-resistor (2) in casing (1), piezo-resistor (2) are equipped with first pin (21), second pin (22), its characterized in that: the casing (1) is equipped with third pin (11), casing (1) is equipped with braced frame (12) between first pin (21), third pin (11), braced frame (12) are equipped with and open and shut subassembly (3) to butt first pin (21), third pin (11), make the circuit intercommunication of first pin (21) and third pin (11), casing (1) is equipped with bimetallic strip (4) to butt subassembly (3) that open and shut, and be connected with first pin (21) for when piezo-resistor (2) temperature is higher, promote the activity of subassembly (3) that open and shut, break the circuit connection of first pin (21) and third pin (11).
2. The varistor with thermal protection function according to claim 1, wherein: the casing (1) is equipped with fixed frame (13), bimetallic strip (4) are installed and are fixed at fixed frame (13), casing (1) is equipped with end cover (14), end cover (14) are equipped with lug (15) to butt piezo-resistor (2).
3. The varistor with thermal protection function according to claim 2, wherein: the bimetallic strip (4) comprises a driving strip (41) and a driven strip (42), the driving strip (41) is connected with the driven strip (42) through a welding process, the driving strip (41) is provided with a first extension plate (43), and the driving strip is connected with the first leading-out pin (21) through the welding process.
4. A varistor with thermal protection according to claim 3, characterized in that: the first leading-out pin (21) and the third leading-out pin (11) are provided with a second extending plate (5), the second extending plate (5) is in vertical relation with the first leading-out pin (21) and the third leading-out pin (11), the second extending plate (5) is provided with a dead point (51), and the third leading-out pin (11) penetrates through the shell (1) and is exposed outside the shell (1).
5. The varistor with thermal protection according to claim 4, wherein: the side wall of the supporting frame (12) is provided with a limiting groove (121), and the limiting groove (121) is provided with a first guide pillar (122).
6. The varistor with thermal protection according to claim 5, wherein: the opening and closing assembly (3) comprises a push rod (31), a spring (32), a moving plate (33) and moving points (34), wherein ejector blocks (35) are arranged on two sides of the push rod (31) and are arranged in limiting grooves (121), the ejector blocks (35) are provided with second guide posts (36), the push rod (31) is provided with a contact rod (37) and is abutted against a driving plate (41), the moving plate (33) is connected with the end face of the push rod (31) through a hot riveting process, the moving plate (33) is arranged on two sides of the moving plate (33), and the spring (32) is arranged between the first guide posts (122) and the second guide posts (36) and acts on the ejector blocks (35) to enable the moving points (34) to be abutted against static points (51).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322806774.0U CN221057216U (en) | 2023-10-19 | 2023-10-19 | Piezoresistor with thermal protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322806774.0U CN221057216U (en) | 2023-10-19 | 2023-10-19 | Piezoresistor with thermal protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221057216U true CN221057216U (en) | 2024-05-31 |
Family
ID=91200312
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322806774.0U Active CN221057216U (en) | 2023-10-19 | 2023-10-19 | Piezoresistor with thermal protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221057216U (en) |
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2023
- 2023-10-19 CN CN202322806774.0U patent/CN221057216U/en active Active
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