CN214476733U - Flame-proof explosion-proof piezoresistor - Google Patents

Abstract

The utility model relates to a piezoresistor technical field especially relates to an explosion-proof piezoresistor prevents fires. The flame-proof and explosion-proof piezoresistor comprises: a varistor body and a housing, wherein: the piezoresistor main body is provided with two leads; the casing comprises an upper casing and a lower casing, wherein an accommodating space for accommodating the main body of the piezoresistor is formed in the upper casing, a wrapping material is filled in the accommodating space, and two lead holes for leading out are formed in the top of the upper casing; the lower shell is sleeved on the upper shell; and the top of the piezoresistor is filled with potting material. The utility model provides a pair of flame-proof explosion-proof piezoresistor is through airtight in the casing with the piezoresistor main part, with external isolated, the effectual burning and the burst of when having prevented that the lightning protection device from puncturing, through filling wrapping material and embedment material in the casing, prevent to puncture and explode in the twinkling of an eye, also played fine flame retardant efficiency.

Description

Flame-proof explosion-proof piezoresistor

Technical Field

The utility model relates to a piezoresistor field, concretely relates to explosion-proof piezoresistor of fire prevention.

Background

The voltage-limiting resistor is a voltage-limiting element sensitive to voltage change, and is characterized by that under the condition of defined temp. and when the voltage exceeds a certain critical value, its resistance value can be sharply reduced, and the current passed through it can be sharply increased, and the voltage and current do not have a linear relationship. Therefore, piezoresistors are also known as non-linear varistors.

The piezoresistor is mainly used in a circuit to absorb overvoltage and surge, the bearing capacity of the piezoresistor is exceeded, or the piezoresistor is subjected to aging failure, so that the problems of fire and explosion of the piezoresistor are easily caused, a circuit board is burnt out, equipment is damaged, and a fire disaster is caused.

Therefore, it is necessary to design a flame-proof and explosion-proof varistor.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to the above-mentioned technical problem who exists among the prior art, provide an explosion-proof piezoresistor of fire prevention, through airtight in the casing with the piezoresistor main part, with external isolated, effectual burning and the burst when preventing the lightning protection device and puncturing, through filling wrapping material and embedment material in the casing, prevent to puncture and explode in the twinkling of an eye, also played fine flame retardant efficiency.

In order to achieve the above technical purpose, an embodiment of the present invention provides an explosion-proof piezoresistor, including piezoresistor main part and casing, wherein: the varistor body has two leads; the casing comprises an upper casing and a lower casing, an accommodating space for accommodating the piezoresistor main body is formed in the upper casing, wrapping materials are filled in the accommodating space, and two lead holes for leading out of the leads are formed in the top of the upper casing; the lower shell is sleeved on the upper shell; and the top of the piezoresistor is filled with potting material.

Further, the wrapping material is quartz sand.

Further, the potting material is epoxy resin.

Further, the lead hole includes a first hole portion and a second hole portion, the first hole portion and the second hole portion communicate, and an inner diameter of the first hole portion is smaller than an inner diameter of the second hole portion.

Further, the height of the upper shell is greater than that of the lower shell, and when the upper shell is connected with the lower shell, a potting space for filling the potting material is formed between the top of the upper shell and the top of the lower shell.

Further, the top of lower casing is provided with a plurality of location portion.

Furthermore, a limiting part is arranged in the accommodating space of the upper shell.

Further, the limiting part comprises two parts, the two parts are spliced to form an annular space, and the piezoresistor main body is arranged in the annular space.

Further, the upper shell comprises an encapsulating part and a containing part, a groove is formed at the joint of the encapsulating part and the containing part, and a protrusion corresponding to the groove is arranged on the lower shell.

The embodiment of the utility model provides an in one or more technical scheme, following technological effect or advantage have at least:

1. the embodiment of the utility model provides an in through airtight in the casing with the piezo-resistor main part, with external isolated, the effectual burning and the burst when preventing the lightning protection device breakdown through filling wrapping material and embedment material in the casing, prevent to puncture and explode in the twinkling of an eye, have also played fine flame retardant efficiency.

2. The embodiment of the utility model provides an in divide into casing and lower casing with the casing, mould for traditional an organic whole, the piezoresistor's of being convenient for equipment.

3. The embodiment of the utility model provides an in the casing get into down behind the casing, go up in the recess of casing can the card income to go up the arch on the casing, fix the casing down, the filling of the embedment material of being convenient for is glued promptly.

Drawings

Fig. 1 is a schematic perspective view of an anti-flaming and anti-explosion piezoresistor according to an embodiment of the present invention;

FIG. 2 is a sectional view of the flame-proof and explosion-proof varistor of the embodiment of the present invention, wherein the plane A is taken as a sectional plane;

fig. 3 is a schematic perspective view of an upper housing according to an embodiment of the present invention;

fig. 4 is a top view of an upper housing in an embodiment of the present invention;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

fig. 6 is a schematic perspective view of the lower housing in the embodiment of the present invention;

fig. 7 is a schematic view of a connection structure of the upper casing, the lower casing and the varistor main body in the embodiment of the present invention;

fig. 8 is a schematic structural diagram of a flame-proof and explosion-proof varistor in an embodiment of the present invention, wherein the varistor is not filled with a potting material;

FIG. 9 is a view of the upper housing of FIG. 3 in the direction of C;

fig. 10 is an enlarged view of a portion D in fig. 2.

Description of the reference numerals

10-the varistor body, 101-the lead;

20-housing, 201-upper housing, 2011-containing space, 2012-lead hole, 2013-first hole portion, 2014-second hole portion, 2015-limiting portion, 2016-potting portion, 2017-containing portion, 2018-annular space, 2019-groove; 202-lower case, 2021-bottom wall, 2022-side wall, 2023-potting space, 2024-installation space, 2025-positioning portion, 2026-protrusion;

30-a wrapping material;

40-potting material.

Detailed Description

Other objects and advantages of the present invention will become apparent from the following explanation of the preferred embodiments of the present invention.

Fig. 1-10 show a schematic structural diagram of a flame-proof and explosion-proof varistor according to the present invention. For convenience of description, the terms "upper", "lower", "left" and "right" are used in the same way as the drawings, but do not limit the structure of the present invention.

As shown in fig. 1 to 10, a flame-proof and explosion-proof varistor comprises a varistor main body 10 and a casing 20, wherein: the varistor body 10 has two leads 101; the housing 20 comprises an upper housing 201 and a lower housing 202, an accommodating space 2011 for accommodating the varistor main body 10 is formed in the upper housing 201, the accommodating space 2011 is filled with a wrapping material 30, and two lead holes 2012 for leading out of the lead 101 are formed in the top of the upper housing 201; the lower shell 202 is sleeved on the upper shell 201; and the top of the piezoresistors is filled with potting material 40.

The embodiment of the utility model provides an in through airtight in casing 20 with piezo-resistor main part 10, with external isolated, the effectual burning and the burst when preventing the lightning protection device and puncturing, through filling in wrapping material 30 and embedment material 40 in casing 20, prevent to puncture and explode in the twinkling of an eye, also played fine flame retardant efficiency.

Preferably, the wrapping material 30 is quartz sand. The potting material 40 is epoxy. The upper shell 201 and the lower shell 202 are made of PBT black fireproof materials, high-grade fireproof materials and multiple fireproof and explosion-proof structures, and combustion when the piezoresistor fails can be fundamentally avoided.

As shown in fig. 4 and 5, the lead hole 2012 includes a first hole portion 2013 and a second hole portion 2014, the first hole portion 2013 and the second hole portion 2014 communicate with each other, and an inner diameter of the first hole portion 2013 is smaller than an inner diameter of the second hole portion 2014. The aperture of the lead hole 2012 is set to provide guiding and positioning functions for the lead 101 to pass through, so as to prevent the lead 101 from directly passing through the lead hole 2012 to damage the lead 101.

As shown in fig. 2, 6, 7 and 8, the height of the upper case 201 is greater than that of the lower case 202, and when the upper case 201 is connected to the lower case 202, an encapsulation space 2023 for filling the encapsulation material 40 is formed between the top of the upper case 201 and the top of the lower case 202. The upper casing 201 includes a bottom wall 2021 and a side wall 2022 connected to the periphery of the bottom wall 2021, the bottom wall 2021 and the side wall 2022 enclose to form an installation space 2024, after the wrapping material 30 is filled, the lower casing 202 is inserted from the bottom of the upper casing 201 until the bottom of the upper casing 201 contacts with the top of the bottom wall 2021 of the lower casing 202, so that the upper casing 201 completely enters the installation space 2024. By dividing the housing 20 into the upper housing 201 and the lower housing 202, assembly of the varistor is facilitated relative to conventional one-piece molding. The potting material 40 is filled at 2/3 of the potting space 2023, and cannot overflow the case 20 and the leads 101, and cannot leak glue.

As shown in fig. 6, the top of the lower case 202 is provided with a plurality of positioning portions 2025.

As shown in fig. 2 and 9, a limiting portion 2015 is arranged in the accommodating space 2011 of the upper housing 201, so that the varistor main body 10 can be conveniently positioned during installation and fixed during encapsulation, and shaking is avoided.

As shown in fig. 9, the limiting portion 2015 includes two parts, the two parts are joined to form an annular space 2018, and the varistor main body 10 is disposed in the annular space 2018. During installation, the piezoresistors are obliquely arranged relative to the accommodating space 2011, correspondingly, the annular space 2018 is oblique, the space is fully utilized, the length of the shell 20 is reduced, and the size of the shell 20 is further reduced.

As shown in fig. 2, 3 and 10, the upper case 201 includes a potting 2016 and a receptacle 2017, a groove 2019 is formed at a connection between the potting 2016 and the receptacle 2017, and a protrusion 2026 corresponding to the groove 2019 is provided on the lower case 202. After the lower housing 202 enters the upper housing 201, the protrusion 2026 on the upper housing 201 can be snapped into the groove 2019 of the upper housing 201 to fix the lower housing 202, which is convenient for filling and dispensing the potting material 40. Preferably, the surface of the protrusion 2026 facing the groove 2019 is an arc-shaped surface, and correspondingly, the bottom of the groove 2019 is an arc-shaped surface, so that the protrusion 2026 can be conveniently clamped into the groove 2019. The stopper 2015 is connected to the inner wall of the potting 2016.

The utility model relates to an in embodiment piezoresistor's equipment process flow does: taking the explosion-proof upper shell 201 by the left hand, enabling the lead 101 of the piezoresistor main body 10 to correspond to the lead hole 2012 by the right hand, enabling the piezoresistor main body 10 to penetrate into the accommodating space 2011 in the upper shell 201, and taking the pressure-sensitive P foot to the bottom of the shell; and (5) putting the arranged jigs into a material tray, filling quartz sand, and shaking left and right. The quartz sand was filled at about 3/2 points in the shell. The product filled with the quartz sand is moved to the jig clamping position upper shell 201 and inverted. The explosion proof housing lower shell 202 is pressed from top to bottom. Proportioning liquid epoxy resin: 9002GA9109 black/9002 GBH-5011 is uniformly mixed and stirred for 10 minutes according to the proportion of 100:13, and epoxy resin is put into a dispensing and glue-bearing barrel after mixing. Arranging the covered products in a jig box. Putting the mixture into a dispenser from outside to inside to tightly attach 90 straight feet; starting the dispensing operation of the dispenser, wherein the dispensing operation is set according to a three-axis intelligent dispenser control system; placing the product subjected to glue dispensing at room temperature, and hardening at normal temperature for 25 ℃/24H or 60 ℃/1H +80 ℃/4H; after hardening, baking at 110 ℃, and ensuring that the liquid epoxy resin does not melt or crack; and pouring the hardened product into a pin cutting rectifying disc, and adjusting the vibration frequency to enable the product to be sent into a pin cutting track in order. And adjusting the distance of the cutter according to the manufacturing flow sheet. The body can not be damaged or damaged, the printing content is correct, the surface of the potting adhesive can not be higher than the shell, and the epoxy can not have bubbles or pinholes; the lead 101 has a pin length of +/-0.5 mm, and is not easy to leak copper, glue and deform; the electrical characteristics are in accordance with the electrical parameters of the corresponding model.

The flame-proof and explosion-proof piezoresistor of the present invention has been described in detail with reference to the preferred embodiments of the present invention, however, it is to be noted that those skilled in the art can make any alterations, modifications and variations on the above disclosure without departing from the spirit of the present invention. The present invention includes the above-described embodiments and any equivalents thereof.

Claims (9)

1. A flame and explosion proof varistor comprising a varistor body (10) and a housing (20), wherein:

the varistor body (10) has two leads (101);

the casing (20) comprises an upper casing (201) and a lower casing (202), an accommodating space (2011) for accommodating the piezoresistor main body (10) is formed in the upper casing (201), a wrapping material (30) is filled in the accommodating space (2011), and two lead holes (2012) for leading out of the leads (101) are formed in the top of the upper casing (201); the lower shell (202) is sleeved on the upper shell (201); and

the top of the piezoresistor is filled with potting material (40).

2. A flame and explosion proof varistor according to claim 1, wherein the wrapping material (30) is quartz sand.

3. A flame and explosion proof varistor according to claim 1, characterized in that the potting material (40) is epoxy resin.

4. The varistor according to claim 1, wherein the feedthrough (2012) comprises a first aperture portion (2013) and a second aperture portion (2014), the first aperture portion (2013) and the second aperture portion (2014) are in communication, and the first aperture portion (2013) has an inner diameter smaller than that of the second aperture portion (2014).

5. The flameproof and explosion-proof varistor according to claim 1, wherein the upper case (201) has a height greater than that of the lower case (202), and when the upper case (201) is coupled to the lower case (202), a potting space (2023) for filling the potting material (40) is formed between the top of the upper case (201) and the top of the lower case (202).

6. The flameproof and explosion-proof piezoresistor according to claim 1, characterized in that the top of the lower case (202) is provided with a plurality of positioning portions (2025).

7. The pressure sensitive resistor of claim 1, wherein a limit portion (2015) is disposed in the receiving space (2011) of the upper housing (201).

8. A flame and explosion proof varistor according to claim 7, characterized in that the limit stop (2015) comprises two parts which are joined to form an annular space (2018), the varistor body (10) being placed in the annular space (2018).

9. The pressure sensitive resistor of claim 1, wherein the upper case (201) comprises a potting portion (2016) and a containing portion (2017), a groove (2019) is formed at the joint of the potting portion (2016) and the containing portion (2017), and a protrusion (2026) corresponding to the groove (2019) is arranged on the lower case (202).

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