CN215377096U - Varistor with fireproof performance - Google Patents
Varistor with fireproof performance Download PDFInfo
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- CN215377096U CN215377096U CN202121867007.5U CN202121867007U CN215377096U CN 215377096 U CN215377096 U CN 215377096U CN 202121867007 U CN202121867007 U CN 202121867007U CN 215377096 U CN215377096 U CN 215377096U
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- retardant
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Abstract
The utility model discloses a piezoresistor with fireproof performance, which comprises a flame-retardant outer shell, wherein an inner shell is arranged inside the flame-retardant outer shell, a fixing plate is fixedly connected to the lower surface of the inner shell, a through hole is formed in the surface of the fixing plate, an encapsulating layer is fixedly connected to the inner wall of the inner shell, a resistor body is fixedly connected to the inner wall of the encapsulating layer, pins are arranged on the surface of the resistor body, the flame-retardant outer shell comprises an outer shell body, a connecting groove is formed in the inner wall of the outer shell body, and the inner shell comprises a shell. According to the utility model, when the resistor body works, heat is generated to expand air between the flame-retardant outer shell and the inner shell, and then a large amount of air is discharged from the bottom of the flame-retardant outer shell through the air between the flame-retardant outer shell and the inner shell, so that the air between the flame-retardant outer shell and the inner shell is thin while heat dissipation is carried out, the oxygen content of the air in contact with the resistor body is very low, and the resistor body is prevented from burning.
Description
Technical Field
The utility model relates to the technical field of piezoresistors, in particular to a piezoresistor with fire-proof performance.
Background
A varistor is an electronic component whose resistance value changes according to the magnitude of an applied voltage, and its current-voltage characteristic curve shows a non-linear change. The piezoresistor has the electrical characteristics, so the piezoresistor is used as a protection element and applied to a circuit to prevent the possible damage of instantaneous surge voltage to other electronic parts, and the working principle is that when the instantaneous surge voltage occurs, the resistance value of the piezoresistor can be rapidly reduced to shunt current, so that the electronic element is protected, and the resistance value of the piezoresistor is very low and is equivalent to a short-circuit state; when the voltage higher than the voltage-sensitive voltage is removed, the voltage-sensitive resistor restores the high-resistance state. In practical use, the piezoresistor is generally connected in parallel to a protected device, when external surge energy rapidly exceeds the tolerance capacity of the piezoresistor, or when the piezoresistor deteriorates under repeated impact of the external surge energy, the piezoresistor can be broken down to be short-circuited, instantaneous energy is large during short-circuiting, local high temperature can be generated at a broken part through breakdown, self explosion and fragment scattering can be caused, safety of other electronic elements or electrical equipment is not facilitated, after an internal integrated temperature fuse of an existing product works, due to thermal inertia effect, especially under the condition of instantaneous breakdown of large-energy surge, the surface temperature of the piezoresistor can still be continuously increased, generated high-heat gas is released in time to easily cause shell explosion, high-temperature high-pressure flame is generated, and destructive fire of a machine room or a base station is often caused in practical application.
In summary, the varistor in the prior art has insufficient flame retardant capability.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the defects in the prior art and provides a piezoresistor with fire-proof performance.
In order to achieve the purpose, the utility model adopts the following technical scheme: the varistor with fireproof performance comprises a flame-retardant outer shell, wherein an inner shell is arranged inside the flame-retardant outer shell, a fixing plate is fixedly connected to the lower surface of the inner shell, a through hole is formed in the surface of the fixing plate, an encapsulating layer is fixedly connected to the inner wall of the inner shell, a resistor body is fixedly connected to the inner wall of the encapsulating layer, pins are arranged on the surface of the resistor body, the flame-retardant outer shell comprises an outer shell body, a connecting groove is formed in the inner wall of the outer shell body, the inner shell comprises a shell, a connecting block is fixedly connected to the surface of the shell, and heat dissipation holes are formed in the surface of the shell.
As a further description of the above technical solution:
the through holes and the pins are symmetrically distributed, and the positions of the through holes are matched with the pins.
As a further description of the above technical solution:
the positions of the heat dissipation holes are matched with the connecting grooves, and the heat dissipation holes are distributed on the front side and the back side of the casing in a rectangular array mode.
As a further description of the above technical solution:
the width of connecting block is greater than the degree of depth of spread groove, the shape and the spread groove adaptation of connecting block.
As a further description of the above technical solution:
the material of inner shell is the heat conduction material, the inner shell passes through the cooperation and the shell body fixed connection of spread groove and connecting block.
As a further description of the above technical solution:
the corners of fire-retardant shell and inner shell all set up to the fillet, the material of fixed plate is fire-retardant material.
As a further description of the above technical solution:
the connecting blocks are distributed at four corners of the front surface and the back surface of the casing, and the positions of the connecting blocks are matched with the connecting grooves.
The utility model has the following beneficial effects:
1. compared with the prior art, this varistor with fire behavior, resistance body during operation production of heat make the air inflation between fire-retardant shell and the inner shell, and then with the air between fire-retardant shell and the inner shell from fire-retardant shell bottom exhaust a large amount of air, when carrying out the heat dissipation, make air rarefied between fire-retardant shell and the inner shell, make the air oxygen content of resistance body contact very low, prevent that the resistance body from taking place the burning.
2. Compared with the prior art, this piezo-resistor with fire behavior through at first encapsulate the layer encapsulation with the resistance body surface, pack the resistance body into the inner shell inside again, through glue installation fixed plate to make the pin of resistance body pass the through-hole, then at the surface coating glue of connecting block, inside pushing the fire-retardant shell of inner shell through the spread groove, glue solidifies the completion fixed, convenient equipment.
Drawings
Fig. 1 is a schematic view of the overall structure of a varistor with fire-proof performance according to the present invention;
fig. 2 is a cross-sectional view of a flame-retardant housing of a varistor according to the utility model with flame-retardant properties;
FIG. 3 is a schematic diagram of an inner casing structure of a varistor with fire-resistant performance according to the present invention;
FIG. 4 is a cross-sectional view of the inner casing structure of the varistor with fireproof performance according to the present invention;
fig. 5 is a schematic structural diagram of a fixing plate of a varistor with fireproof performance according to the present invention.
Illustration of the drawings:
1. a flame retardant housing; 2. an inner shell; 3. a fixing plate; 4. a through hole; 5. an encapsulation layer; 6. a resistor body; 7. a pin; 101. a housing body; 102. connecting grooves; 201. a housing; 202. connecting blocks; 203. and (4) heat dissipation holes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 5, the present invention provides a varistor having a fireproof property: the flame-retardant cable comprises a flame-retardant outer shell 1, an inner shell 2 is arranged inside the flame-retardant outer shell 1, corners of the flame-retardant outer shell 1 and corners of the inner shell 2 are all set to be round corners, a fixing plate 3 is fixedly connected to the lower surface of the inner shell 2, the fixing plate 3 is made of flame-retardant materials, through holes 4 are formed in the surface of the fixing plate 3, an encapsulating layer 5 is fixedly connected to the inner wall of the inner shell 2, the encapsulating layer 5 is made of epoxy resin, a resistor body 6 is fixedly connected to the inner wall of the encapsulating layer 5, pins 7 are arranged on the surface of the resistor body 6, the resistor body 6 generates heat to enable air between the flame-retardant outer shell 1 and the inner shell 2 to expand, a large amount of air is discharged from the bottom of the flame-retardant outer shell 1, heat dissipation is carried out, the oxygen content of the air in contact with the resistor body 6 is low, and the resistor body 6 is prevented from burning;
the flame-retardant outer shell 1 comprises an outer shell body 101, a connecting groove 102 is formed in the inner wall of the outer shell body 101, the inner shell 2 comprises a casing 201, a connecting block 202 is fixedly connected to the surface of the casing 201, heat dissipation holes 203 are formed in the surface of the casing 201, the positions of the heat dissipation holes 203 are matched with the connecting groove 102, the heat dissipation holes 203 are distributed on the front side and the back side of the casing 201 in a rectangular array mode, and the heat dissipation effect is better;
the through holes 4 and the pins 7 are symmetrically distributed, and the positions of the through holes 4 are matched with the pins 7, so that the pins 7 can be conveniently led out to be connected with other elements;
the width of the connecting block 202 is larger than the depth of the connecting groove 102, so that a gap exists between the flame-retardant outer shell 1 and the inner shell 2, air is conveniently discharged during expansion, the shape of the connecting block 202 is matched with the connecting groove 102, and the flame-retardant outer shell 1 and the inner shell 2 are stably connected;
the inner shell 2 is made of a heat conducting material, the heat dissipation capacity is improved, the connecting blocks 202 are distributed at four corners of the front side and the back side of the casing 201, the positions of the connecting blocks 202 are matched with the connecting grooves 102, and the inner shell 2 is fixedly connected with the outer shell body 101 through the matching of the connecting grooves 102 and the connecting blocks 202;
the working principle is as follows: when the flame-retardant outer shell is assembled, the surface of a resistor body 6 is firstly packaged by an encapsulating layer 5, then the resistor body 6 is arranged in an inner shell 2, a fixing plate 3 is installed through glue, pins 7 of the resistor body 6 penetrate through holes 4, then the surface of a connecting block 202 is coated with the glue, the inner shell 2 is pushed into the flame-retardant outer shell 1 through a connecting groove 102, and the glue is solidified and fixed;
when the flame-retardant resistor is used, the resistor body 6 generates heat to enable air between the flame-retardant outer shell 1 and the inner shell 2 to expand, and further a large amount of air is discharged from the bottom of the flame-retardant outer shell 1, so that the oxygen content of the air contacted with the resistor body 6 is low while heat dissipation is carried out, and the resistor body 6 is prevented from burning.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.
Claims (7)
1. Varistor with fire behavior, including fire-retardant shell (1), its characterized in that: an inner shell (2) is arranged inside the flame-retardant outer shell (1), a fixing plate (3) is fixedly connected to the lower surface of the inner shell (2), a through hole (4) is formed in the surface of the fixing plate (3), an encapsulating layer (5) is fixedly connected to the inner wall of the inner shell (2), a resistor body (6) is fixedly connected to the inner wall of the encapsulating layer (5), and pins (7) are arranged on the surface of the resistor body (6);
the flame-retardant outer shell (1) comprises an outer shell body (101), a connecting groove (102) is formed in the inner wall of the outer shell body (101), the inner shell (2) comprises a shell (201), a connecting block (202) is fixedly connected to the surface of the shell (201), and heat dissipation holes (203) are formed in the surface of the shell (201).
2. The varistor with fire protection according to claim 1, wherein: the through holes (4) and the pins (7) are symmetrically distributed, and the positions of the through holes (4) are matched with the pins (7).
3. The varistor with fire protection according to claim 1, wherein: the positions of the heat dissipation holes (203) are matched with the connecting grooves (102), and the heat dissipation holes (203) are distributed on the front side and the back side of the casing (201) in a rectangular array mode.
4. The varistor with fire protection according to claim 1, wherein: the width of the connecting block (202) is larger than the depth of the connecting groove (102), and the shape of the connecting block (202) is matched with that of the connecting groove (102).
5. The varistor with fire protection according to claim 1, wherein: the material of inner shell (2) is the heat conduction material, inner shell (2) through the cooperation of connecting groove (102) and connecting block (202) and shell body (101) fixed connection.
6. The varistor with fire protection according to claim 1, wherein: the corners of the flame-retardant outer shell (1) and the inner shell (2) are both provided with fillets, and the fixing plate (3) is made of flame-retardant materials.
7. The varistor with fire protection according to claim 1, wherein: the connecting blocks (202) are distributed at four corners of the front surface and the back surface of the casing (201), and the positions of the connecting blocks (202) are matched with the connecting grooves (102).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121867007.5U CN215377096U (en) | 2021-08-11 | 2021-08-11 | Varistor with fireproof performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121867007.5U CN215377096U (en) | 2021-08-11 | 2021-08-11 | Varistor with fireproof performance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215377096U true CN215377096U (en) | 2021-12-31 |
Family
ID=79617785
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121867007.5U Active CN215377096U (en) | 2021-08-11 | 2021-08-11 | Varistor with fireproof performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215377096U (en) |
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2021
- 2021-08-11 CN CN202121867007.5U patent/CN215377096U/en active Active
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