CN212934289U - Thermal protection type piezoresistor - Google Patents
Thermal protection type piezoresistor Download PDFInfo
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- CN212934289U CN212934289U CN202021568958.8U CN202021568958U CN212934289U CN 212934289 U CN212934289 U CN 212934289U CN 202021568958 U CN202021568958 U CN 202021568958U CN 212934289 U CN212934289 U CN 212934289U
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Abstract
The utility model relates to the technical field of piezoresistor application, in particular to a thermal protection type piezoresistor, which comprises a piezoresistor main body, a lead and a spring, wherein the outer side of the piezoresistor main body is fixedly connected with a protection shell, the bottom of the piezoresistor main body is fixedly connected with the lead, the outer side of the lead is fixedly connected with a heat insulation shell, the bottom of the heat insulation shell is fixedly connected with a limiting plate, the limiting plate is fixedly connected with the lead, the outer side of the lead is provided with the spring, the outer side of the bottom of the lead is fixedly connected with an insulating plate, and a circuit board is arranged below the insulating plate. The main body of the piezoresistor is powered off, so that fire is prevented.
Description
Technical Field
The utility model relates to a technical field is used to the piezo-resistor, specifically is a thermal protection type piezo-resistor.
Background
The voltage dependent resistor is a voltage limiting type protection device, and by utilizing the nonlinear characteristic of the voltage dependent resistor, when overvoltage appears between two poles of the voltage dependent resistor, the voltage dependent resistor can clamp the voltage to a relatively fixed voltage value, so that the protection of a rear-stage circuit is realized, and the main parameters of the voltage dependent resistor are as follows: voltage dependent voltage, current capacity, junction capacitance, response time, etc.
When the traditional piezoresistor is used, under the condition that fault overvoltage occurs to a system, a piezoceramic body can be overheated, the phenomenon of shell breakdown occurs, when the shell breakdown, the combined action of high temperature and voltage can be generated, nearby inflammable materials can be ignited, open fire occurs, and finally fire can be caused.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a thermal protection type piezo-resistor to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a thermal protection type piezo-resistor, includes piezo-resistor main part, lead wire and spring, piezo-resistor main part outside fixedly connected with protection casing, piezo-resistor main part bottom and lead wire fixed connection, the thermal-insulated casing of lead wire top outside fixedly connected with, thermal-insulated casing bottom fixedly connected with limiting plate, in the limiting plate with lead wire fixed connection, the lead wire outside is equipped with the spring, lead wire bottom outside fixedly connected with insulation board, the insulation board below is equipped with the circuit board, spring outside fixedly connected with welding material.
Preferably, the protection casing includes paint layer and heat conduction silicone grease, the paint in situ fixedly connected with first insulation layer, fixedly connected with anticorrosive coating in the first insulation layer, fixedly connected with shielding layer in the anticorrosive coating, in the shielding layer with heat conduction silicone grease fixed connection, fixedly connected with heat conduction pole in the heat conduction silicone grease, fixedly connected with second insulation layer in the heat conduction silicone grease, in the second insulation layer with piezo-resistor main part fixed connection.
Preferably, the heat conducting rod is composed of a graphite block, the bottom of the heat conducting rod is fixedly connected with the second insulating layer, and the outer side of the top of the heat conducting rod is fixedly connected with the paint layer.
Preferably, the top of the spring is fixedly connected with the limiting plate, and the bottom of the spring is fixedly connected with the insulating plate.
Preferably, the welding material is a low-melting-point welding material, the welding material is fixedly connected with the insulating plate, and the bottom of the welding material is fixedly connected with the circuit board.
Compared with the prior art, the beneficial effects of the utility model are that:
1. in the utility model, the heat generated by the piezoresistor main body can be dissipated through the arranged heat dissipation silicone grease, the heat conducting rod and the insulating layer, so that the piezoresistor main body is protected from overheating, the piezoresistor main body is more stable in use, and meanwhile, the piezoresistor main body can be ensured not to be influenced by the outside through the first insulating layer, the second insulating layer and the anticorrosive layer, so that the service life is longer;
2. the utility model discloses in, through welding material, spring and the insulation board that sets up, can pop out the piezo-resistor main part when the piezo-resistor main part is overheated, for the power off of piezo-resistor main part, prevent that the piezo-resistor main part from puncturing the casing because of high temperature high voltage, prevent that the inflammable matter around the piezo-resistor main part from being lighted, prevent the conflagration breaing out.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the protective casing of the present invention;
fig. 3 is a schematic view of the lead mounting structure of the present invention.
In the figure: 1-a piezoresistor main body, 2-a protective shell, 201-a paint layer, 202-a first insulating layer, 203-an anticorrosive layer, 204-a shielding layer, 205-heat-conducting silicone grease, 206-a second insulating layer, 207-a heat-conducting rod, 3-a lead, 4-a limiting plate, 5-a spring, 6-an insulating plate, 7-a welding material, 8-a heat-insulating shell and 9-a circuit board.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution:
a thermal protection type piezoresistor comprises a piezoresistor main body 1, a lead 3 and a spring 5, wherein the outer side of the piezoresistor main body 1 is fixedly connected with a protection shell 2, the piezoresistor main body 2 can be prevented from overheating through the protective shell 2, the stable operation of the piezoresistor main body 2 is ensured, the bottom of the piezoresistor main body 1 is fixedly connected with the lead 3, the outer side above the lead 3 is fixedly connected with the heat insulation shell 8, the bottom of the heat insulation shell 8 is fixedly connected with the limiting plate 4, the inner part of the limiting plate 4 is fixedly connected with the lead 3, the outer side of the lead 3 is provided with the spring 5, the outer side of the bottom of the lead 3 is fixedly connected with the insulation plate 6, the lower part of the insulation plate 6 is provided with, can pop out piezo-resistor main part 2 when piezo-resistor main part 2 is overheated through this setting, make piezo-resistor main part 2 outage, make near the easy-to-contaminate body of piezo-resistor main part 2 can not catch fire.
The protective shell 2 comprises a paint layer 201 and heat-conducting silicone grease 205, a first insulating layer 202 is fixedly connected in the paint layer 201, electrons in the air can be prevented from affecting the main varistor body 2 through the first insulating layer 202, an anticorrosive layer 203 is fixedly connected in the first insulating layer 202, the main varistor body 2 can be prevented from being corroded through the anticorrosive layer 203, the main varistor body 2 can run more stably, a shielding layer 204 is fixedly connected in the anticorrosive layer 203, the shielding layer 204 is fixedly connected with the heat-conducting silicone grease 205, a heat-conducting rod 207 is fixedly connected in the heat-conducting silicone grease 205, a second insulating layer 206 is fixedly connected in the heat-conducting silicone grease 205, heat generated in the main varistor body 2 can be led out through the arrangement, the main varistor body 2 runs more stably, the second insulating layer 206 is fixedly connected with the main varistor body 1, and the electrons in the main varistor body 2 can be prevented from overflowing to cause damage to surrounding components through the arrangement, the heat conducting rod 207 is composed of a graphite block, the bottom of the heat conducting rod 207 is fixedly connected with the second insulating layer 206, the outer side of the top of the heat conducting rod 207 is fixedly connected with the paint layer 201, the heat in the piezoresistor main body 2 can be conveniently led out through the arrangement, so that the piezoresistor main body 2 can run more stably, the top of the spring 5 is fixedly connected with the limiting plate 4, the bottom of the spring 5 is fixedly connected with the insulating plate 6, the spring 5 can be prevented from contacting with the circuit board 9 through the arrangement, the circuit board 9 is affected, the welding material 7 is low-melting-point welding material, the welding material 7 is fixedly connected with the insulating plate 6, the bottom of the welding material 7 is fixedly connected with the circuit board 9, can pop out piezo-resistor main part 2 from circuit board 9 when piezo-resistor main part 2 high temperature through this setting, make piezo-resistor main part 2 cut off the power supply, can not cause the phenomenon that inflammable is on fire.
The working process is as follows: when the thermal protection type piezoresistor is used, the lead 3 is aligned to the preformed hole of the circuit board 9, the insulating board 6 moves upwards, the insulating board 6 drives the spring 5 to compress, the spring 5 has elasticity after being compressed, the lead 3 is inserted into the preformed hole of the circuit board 9, the bottom of the insulating board 6 is in close contact with the circuit board 9 under the action of the elasticity of the spring 5, the lead 3 and the circuit board 9 are welded through the welding material 7, the welding material 7 is attached to the surfaces of the spring 5, the lead 3, the insulating board 6 and the circuit board 9 to realize positioning, the piezoresistor main body 1 can realize the function of the piezoresistor, when the circuit board 9 is electrified to use, the piezoresistor main body 1 works to generate heat during working, the heat reaches the heat-conducting silicone grease 205 through the second insulating layer 206, the heat is absorbed by the heat-conducting silicone 205 and then is sent out of the protective shell 2 through the heat-conducting, the heat in the varistor body 1 can be dissipated, so that the heat in the varistor body 1 can be prevented from being accumulated in a large amount, the protective casing 2 can not be broken down, meanwhile, the first insulating layer 202 can prevent electrons in the air from entering the varistor body 1 to influence the varistor body 1, meanwhile, the second insulating layer 206 can prevent the electrons in the varistor body 1 from overflowing to damage other electronic elements, the anticorrosive layer 203 can prevent elements with corrosion effects from entering the varistor body 1 to cause damage to the varistor body 1 and break down the protective casing 2 to cause fire, the sudden heat in the varistor body 1 is increased, when the heat cannot be dissipated timely by the heat conducting silicone grease 205 and the heat conducting rod 207, the heat can be transferred to the welding material 7 through the lead 3, and when a large amount of heat enters the welding material 7 because the melting point of the welding material 7 is low, the solder material 7 is melted and the lead wire 3 is ejected from the circuit board 9 by the elastic force of the spring 5, so that the varistor body 1 is electrically disconnected and the ignition is prevented.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A thermal protection type varistor, includes varistor main part (1), lead wire (3) and spring (5), its characterized in that: varistor main part (1) outside fixedly connected with protects casing (2), varistor main part (1) bottom and lead wire (3) fixed connection, lead wire (3) top outside fixedly connected with heat insulating housing (8), heat insulating housing (8) bottom fixedly connected with limiting plate (4), in limiting plate (4) with lead wire (3) fixed connection, the lead wire (3) outside is equipped with spring (5), lead wire (3) bottom outside fixedly connected with insulation board (6), insulation board (6) below is equipped with circuit board (9), spring (5) outside fixedly connected with welding material (7).
2. A thermally protected varistor according to claim 1, wherein: protection casing (2) include paint layer (201) and heat conduction silicone grease (205), fixedly connected with first insulation layer (202) in paint layer (201), fixedly connected with anticorrosive coating (203) in first insulation layer (202), fixedly connected with shielding layer (204) in anticorrosive coating (203), in shielding layer (204) with heat conduction silicone grease (205) fixed connection, fixedly connected with heat conduction pole (207) in heat conduction silicone grease (205), fixedly connected with second insulation layer (206) in heat conduction silicone grease (205), in second insulation layer (206) with piezo-resistor main part (1) fixed connection.
3. A thermally protected varistor according to claim 2, wherein: the heat conducting rod (207) is composed of a graphite block, the bottom of the heat conducting rod (207) is fixedly connected with the second insulating layer (206), and the outer side of the top of the heat conducting rod (207) is fixedly connected with the paint layer (201).
4. A thermally protected varistor according to claim 1, wherein: the top of the spring (5) is fixedly connected with the limiting plate (4), and the bottom of the spring (5) is fixedly connected with the insulating plate (6).
5. A thermally protected varistor according to claim 1, wherein: the welding material (7) is a low-melting-point welding material, the welding material (7) is fixedly connected with the insulating plate (6), and the bottom of the welding material (7) is fixedly connected with the circuit board (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021568958.8U CN212934289U (en) | 2020-08-04 | 2020-08-04 | Thermal protection type piezoresistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021568958.8U CN212934289U (en) | 2020-08-04 | 2020-08-04 | Thermal protection type piezoresistor |
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| Publication Number | Publication Date |
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| CN212934289U true CN212934289U (en) | 2021-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021568958.8U Active CN212934289U (en) | 2020-08-04 | 2020-08-04 | Thermal protection type piezoresistor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115359981A (en) * | 2022-09-06 | 2022-11-18 | 福建省乔光电子科技有限公司 | Thermal protection piezoresistor module |
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2020
- 2020-08-04 CN CN202021568958.8U patent/CN212934289U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115359981A (en) * | 2022-09-06 | 2022-11-18 | 福建省乔光电子科技有限公司 | Thermal protection piezoresistor module |
| CN115359981B (en) * | 2022-09-06 | 2024-05-24 | 福建省乔光电子科技有限公司 | Thermal protection piezoresistor module |
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