CN206148196U - Explosion -proof pressure sensitive resistor - Google Patents

Abstract

The utility model discloses an explosion -proof pressure sensitive resistor, it includes the shell, be equipped with buffering filler and piezo -resistor in the shell, piezo -resistor includes the piezo -resistor body and is located the pin on the piezo -resistor body, the buffering filler fill in the piezo -resistor body with between the shell, the pin extends to from the lower extreme opening part of shell outside the shell, the lower extreme opening of shell solidifies sealedly through silica gel, the top of shell is equipped with a plurality of through -hole, be equipped with the rubber buffer in the through -hole, be equipped with the air vent on the rubber buffer, the diameter of air vent outwards reduces and draws one section distance back in to be linked together with the external world from interior gradually. Piezoresistor can effectually prevent that rupture of case that arouse has characteristics safe in utilization, longe -lived because high temperature produces gaseously in the shell, this explosion -proof pressure sensitive resistor can be applied to equipment such as arrester.

Description

Anti-explosion piezo-resistance device

Technical field

This utility model is related to technical field of electronic components, more particularly to a kind of anti-explosion piezo-resistance device.

Background technology

The piezoresistor for being conventionally used to spark gap uses the organic materials such as epoxy resin parcel, when actually used, one As be parallel to by protection equipment.When extraneous surge energy exceedes the tolerance of varistor, varistor can be breakdown short Road, transcient short circuit time energy is very big, and localized hyperthermia can be produced at punch through damage, may draw the coating layer wrapped up outside chip varistor Combustion bursts, and electrical fire is likely to result in when serious.Additionally, traditional pressure sensitive resistor product pin bottom in thunderbolt is easy Form electric arc, stannum or other conductors are remained in and drawn after reason is that pin is contacted with piezoresistor ceramics or gap is too little or welds Between foot and voltage dependent resistor chip, easily producing electric arc in lightning stroke process causes product failure.

Utility model content

Technical problem to be solved in the utility model be to provide it is a kind of can effectively avoid rupture of case, using safety Anti-explosion piezo-resistance device.

To solve above-mentioned technical problem, technical solution adopted in the utility model is：A kind of anti-explosion piezo-resistance device, its It is characterised by：Including shell, the inside the shell is provided with buffer fillings thing and varistor, and the varistor includes varistor Body and the pin on varistor body, the buffer fillings thing is filled in the varistor body and the shell Between, the pin is extended to outside the shell from the lower ending opening of shell, and the lower ending opening of the shell is entered by silica gel Row solidification sealing；Several through holes are provided with the top of the shell, rubber stopper is provided with the through hole, the rubber stopper is provided with Passage, the diameter of the passage is from inside to outside gradually reduced and draws in and be connected with the external world after a segment distance.

Further technical scheme is：The varistor body includes Zinc-oxide piezoresistor ceramics, the ceramics Two apparent surfaces be provided with silver electrode layer, the medial end of two pins is welded on the symmetrical table of the ceramics by scolding tin respectively On the silver electrode layer at the middle part in face, the pin is provided with what is extended laterally at place relative with Zinc-oxide piezoresistor ceramics edge Kink, the external connection end of the pin keeps between Zinc-oxide piezoresistor ceramics certain gap, epoxy Jing after kink Resin surface layer wraps up whole Zinc-oxide piezoresistor ceramics, the medial end of pin and part kink.

Further technical scheme is：The kink is started from outside pin weld part.

Further technical scheme is：The gap is 0.5～1.5 millimeter.

Further technical scheme is：The buffer fillings thing is spheroidal particle or cylindrical particle.

Further technical scheme is：The buffer fillings thing uses the insulation and moisture incombustible material of high temperature resistance and high strength It is made.

It is using the beneficial effect produced by above-mentioned technical proposal：Fill between the varistor body and shell The granular pattern protection against the tide incombustible material of high temperature resistance and high strength, can effectively play the effect of resistance to compression buffering and moistureproof radiating；Shell Through hole is provided with, rubber stopper is provided with through hole, rubber stopper is provided with passage, and the diameter of passage is from inside to outside gradually reduced simultaneously Draw in and be connected with the external world after a segment distance, when the air pressure of inside the shell becomes big, by gas after the gathering section on passage is supportted greatly Body discharge, make the air pressure of inside the shell equal with atmospheric pressure, can effectively prevent because inside the shell air pressure is excessive cause it is quick-fried It is fried；When recovering to atmospheric pressure, the gathering section on passage reverts to original state, can effectively prevent water or dampness from ventilation Hole enters into the inside the shell so as to work more stable, service life is longer.

Additionally, by being provided with extend laterally curved in the pin junction relative with Zinc-oxide piezoresistor ceramics edge Folding part, the external connection end skew for making pin gets around varistor ceramics edge, and the offset by gap of formation can prevent varistor from producing There is electric arc Problem of Failure in thunderbolt in product.

Description of the drawings

This utility model is described in further detail with reference to the accompanying drawings and detailed description.

Fig. 1 is the cross section structure diagram of piezoresistor described in this utility model embodiment；

Fig. 2 is the cross section structure diagram of varistor described in this utility model embodiment；

Fig. 3 is the enlarged section structural representation of rubber stopper described in this utility model embodiment；

Wherein：1st, shell, 2, buffer fillings thing, 3, varistor body, 31, Zinc-oxide piezoresistor ceramics, 32, silver electricity Pole layer, 33, epoxy skins, 4, pin, 41, kink, 42, external connection end, 5, silica gel, 6, through hole, 7, rubber stopper, 8, ventilation Hole.

Specific embodiment

With reference to the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out clearly Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the present utility model, rather than whole Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment for being obtained, belongs to the scope of this utility model protection.

Many details are elaborated in the following description in order to fully understand this utility model, but this practicality is new Type can also be different from alternate manner described here to implement using other, and those skilled in the art can be without prejudice to this reality With doing similar popularization in the case of new intension, therefore this utility model is not limited by following public specific embodiment.

As shown in figure 1, the utility model discloses a kind of anti-explosion piezo-resistance device, including shell 1, the making material of shell Can be any one of the prior art, additionally, concrete size those skilled in the art of shell are according to the knowledge grasped Appropriate selection can be made to meet the specific requirement of the application.Buffer fillings thing 2 and pressure-sensitive electricity are provided with the shell 1 Resistance, the varistor includes varistor body 3 and the pin 4 on varistor body 3, it should be noted that institute State varistor can for it is of the prior art any one.

The buffer fillings thing 2 is filled between the varistor body 3 and the shell 1, and the pin 4 is from shell Extend at 1 lower ending opening outside the shell 1, the lower ending opening of the shell 1 carries out solidification sealing by silica gel 5；It is described The top of shell 1 is provided with several through holes 6, the through hole 6 and is provided with rubber stopper 7, and the rubber stopper 7 is provided with passage 8, institute The diameter for stating passage 8 is from inside to outside gradually reduced and draws and be connected with the external world after a segment distance that (passage 8 starts as poroid in Then become gap-like to be in communication with the outside), as shown in Figure 3.It should be noted that the rubber stopper can be fixed on by adhesive In the through hole, it is convenient for changing, and installs simple.

Shell is provided with through hole, and rubber stopper is provided with through hole, and rubber stopper is provided with passage, and the diameter of passage is from introversion It is gradually reduced outward and draws in and be connected with the external world after a segment distance, when the air pressure of inside the shell becomes big, by the gathering on passage Gas is discharged after section support is big, makes the air pressure of inside the shell equal with atmospheric pressure, can effectively be prevented because of inside the shell air pressure mistake The blast for causing greatly；When recover to atmospheric pressure when, the gathering section on passage reverts to original state, can effectively prevent water or Person's dampness enters into the inside the shell from passage so as to work more stable, the life-span is longer.

As depicted in figs. 1 and 2, the varistor body 3 include Zinc-oxide piezoresistor ceramics 31, the two of the ceramics Individual apparent surface is provided with silver electrode layer 32, and the medial end of two pins is welded on the ceramics symmetrical surface by scolding tin respectively Middle part silver electrode layer 32 on.The pin 4 is provided with place relative with Zinc-oxide piezoresistor ceramics edge and extends laterally Kink 41, the external connection end 42 of the pin 4 keeps certain Jing after kink 41 between Zinc-oxide piezoresistor ceramics 31 Gap, epoxy skins 33 are by the medial end and part kink of whole Zinc-oxide piezoresistor ceramics 31, pin 41 parcels.It should be noted that concrete size this area of Zinc-oxide piezoresistor ceramics 31, silver electrode layer 32 and pin 4 Technical staff can according to actual needs carry out appropriate selection, to meet the needs of the application.Further, as shown in Fig. 2 The kink 41 is started from outside pin weld part, and the gap can be 0.5～1.5 millimeter.

By being provided with the kink for extending laterally in the pin junction relative with Zinc-oxide piezoresistor ceramics edge, The external connection end skew for making pin gets around varistor ceramics edge, and the offset by gap of formation can prevent varistor product in thunder Occurs electric arc Problem of Failure when hitting, this anti-explosion piezo-resistance device can be applicable to the equipment such as spark gap.

Preferably, the buffer fillings thing 2 is spheroidal particle or cylindrical particle.Further, the buffer fillings Thing 2 is made using the insulation and moisture incombustible material of high temperature resistance and high strength.Because between the varistor body and shell Fill the granular pattern protection against the tide incombustible material of high temperature resistance and high strength and there is certain space between granule and granule, can be effective Play the effect of resistance to compression buffering and moistureproof radiating.

Used as another preferred version, the surface of shell 1 is provided with organic silicon coating, and organic silicon coating thickness can be 0.02 ～0.1 millimeter, the organic silicon coating has good high-temperature stability so that piezoresistor of the present utility model can be in ring Border temperature is run under the conditions of being up to 125 DEG C, and traditional piezoresistor only can tolerate 85 DEG C of high temperature.

Claims (6)

1. a kind of anti-explosion piezo-resistance device, it is characterised in that：Including shell (1), in the shell (1) buffer fillings thing is provided with (2) and varistor, the varistor includes varistor body (3) and the pin on varistor body (3) (4), the buffer fillings thing (2) is filled between the varistor body (3) and the shell (1), the pin (4) from The shell (1) is extended at the lower ending opening of shell (1) outward, the lower ending opening of the shell (1) is carried out admittedly by silica gel (5) Change sealing；It is provided with the top of the shell (1) in several through holes (6), the through hole (6) and is provided with rubber stopper (7), the rubber Plug (7) is provided with passage (8), the diameter of the passage (8) be from inside to outside gradually reduced and draw in after a segment distance with it is outer Boundary is connected.

2. anti-explosion piezo-resistance device as claimed in claim 1, it is characterised in that：The varistor body (3) is including oxidation Zinc varistor ceramics (31), two apparent surfaces of the ceramics are provided with silver electrode layer (32), the medial end of two pins Be welded on the silver electrode layer (32) at the middle part of the ceramics symmetrical surface by scolding tin respectively, the pin (4) with oxidation Zinc varistor ceramics edge is provided with the kink (41) for extending laterally, external connection end (42) Jing of the pin (4) with respect to place Kink (41) keeps afterwards certain gap between Zinc-oxide piezoresistor ceramics (31), and epoxy skins (33) will be whole Zinc-oxide piezoresistor ceramics (31), the medial end of pin and part kink (41) parcel.

3. anti-explosion piezo-resistance device as claimed in claim 2, it is characterised in that：The kink (41) starts from pin weld part Outside.

4. anti-explosion piezo-resistance device as claimed in claim 2, it is characterised in that：The gap is 0.5～1.5 millimeter.

5. anti-explosion piezo-resistance device as claimed in claim 1, it is characterised in that：The buffer fillings thing (2) is spheroidal particle Or cylindrical particle.

6. anti-explosion piezo-resistance device as claimed in claim 1, it is characterised in that：The buffer fillings thing (2) uses high temperature resistant The insulation and moisture incombustible material of high intensity is made.