CN-122025320-A - Pressure-sensitive electrode, piezoresistor assembly and surge protector

CN122025320ACN 122025320 ACN122025320 ACN 122025320ACN-122025320-A

Abstract

The invention relates to a pressure-sensitive electrode, a piezoresistor assembly and a surge protector, and belongs to the technical field of piezoresistors. The surge protector comprises a piezoresistor assembly, wherein the piezoresistor assembly comprises a pressure-sensitive electrode, the pressure-sensitive electrode comprises an electrode body and a welding boss, the welding boss is arranged on the connecting side of the electrode body, a first blocking groove is formed in the connecting side of the electrode body, and the first blocking groove blocks the part of the direction or all the directions around the welding boss. According to the pressure-sensitive electrode, the piezoresistor assembly and the surge protector, the connecting side of the electrode body is attached to the gasket, an intrusion section is formed between the connecting side and the gasket, the direction from the welding boss to the edge of the electrode body in the intrusion section is the intrusion direction, and the first blocking groove can block the capillary phenomenon water absorption path of liquid water in the intrusion direction. By the arrangement, moisture can be effectively prevented from flowing to the edge of the ceramic of the piezoresistor along the surface of the electrode body, and the piezoresistor is prevented from being wetted and failed due to short circuit.

Inventors

CHEN TA
ZHANG HAILIN
CHEN LINAN
BAO SHUGENG
LI TIANMI

Assignees

四川中光防雷科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260402

Claims (12)

1. The utility model provides a pressure-sensitive electrode, its characterized in that includes electrode body and welding boss, the welding boss set up in the connection side of electrode body, the connection side of electrode body is provided with first recess that blocks, first recess that blocks will the welding boss is around part direction or all direction block.
2. The pressure sensitive electrode of claim 1, wherein the first blocking groove surrounds the weld boss.
3. The pressure sensitive electrode of claim 2, wherein the first blocking groove is in the shape of a closed loop.
4. The pressure sensitive electrode of claim 2, wherein the first blocking groove is of an intermittent configuration.
5. The pressure sensitive electrode according to claim 1, wherein the electrode body is provided with at least two first blocking grooves, and at least two first blocking grooves are arranged around the welding boss at intervals.
6. A varistor assembly comprising the pressure sensitive electrode of claims 1-5.
7. The varistor assembly of claim 6, further comprising a housing and a varistor, wherein the pressure sensitive electrode is bonded to the varistor, and wherein the opening of the first blocking recess is closed and forms a blocking cavity.
8. The varistor assembly of claim 7, further comprising a gasket positioned between the pressure sensitive electrode and the housing, the opening of the first blocking recess being closed by one side of the gasket.
9. The varistor assembly of claim 8, wherein at least one of the opposite sides of the shim and the housing is provided with a second blocking groove.
10. The varistor assembly of claim 9, wherein the second blocking groove surrounds the weld boss.
11. The varistor assembly of claim 10, wherein the second blocking groove is in the form of a closed ring.
12. A surge protector comprising the varistor assembly of claim 11.

Description

Pressure-sensitive electrode, piezoresistor assembly and surge protector Technical Field The invention belongs to the technical field of piezoresistors, and particularly relates to a pressure-sensitive electrode, a piezoresistor assembly and a surge protector. Background In a varistor type surge protector, a varistor assembly is generally used, and the varistor assembly generally includes a case, a varistor, a voltage-sensitive electrode, a gasket, and the like, the voltage-sensitive electrode is bonded and fixed to one side of the varistor, and the gasket is disposed between the voltage-sensitive electrode and the case. The pressure-sensitive electrode generally comprises an electrode body and a welding boss, wherein the electrode body is of a flat plate structure, the surface of the electrode body is flat, the electrode body and the gasket are attached and fixed, however, a certain gap can exist in any way of being attached tightly, and the size of the gap is very small. Because the welding boss is naked, moisture can form the condensation here, just because the existence of the tiny gap between electrode body and the gasket for liquid condensation can permeate from welding boss department to the edge of electrode body under the effect of capillary phenomenon, thereby reaches the piezo-resistor, thereby makes the piezo-resistor wet, produces the risk of failure. Disclosure of Invention In view of the above, an object of the present invention is to provide a voltage-sensitive electrode, a varistor assembly, and a surge protector, which can effectively prevent moisture (liquid dew) from flowing along the surface of the electrode body to the varistor, and prevent the varistor from being wetted and short-circuited. The technical scheme of the invention is as follows: The invention provides a pressure-sensitive electrode, which comprises an electrode body and a welding boss, wherein the welding boss is arranged on the connecting side of the electrode body, a first blocking groove is arranged on the connecting side of the electrode body, and the first blocking groove blocks part of or all directions around the welding boss. As an alternative, the first blocking groove is disposed on at least one side around the welding boss. Alternatively, the first blocking groove surrounds the welding boss. Alternatively, the first blocking groove is in a closed ring shape. Alternatively, the first blocking groove is in an intermittent structure. Alternatively, the electrode body is provided with one of the first blocking grooves. As an alternative, the electrode body is provided with at least two first blocking grooves, and the at least two first blocking grooves are arranged around the welding boss at intervals. Alternatively, the electrode body is sheet-shaped or plate-shaped. The invention also provides a piezoresistor assembly comprising the pressure-sensitive electrode. Alternatively, the varistor assembly further comprises a casing and a varistor, the pressure-sensitive electrode is attached to the varistor, and the opening of the first blocking groove is closed and forms a blocking cavity. Alternatively, the varistor assembly further includes a gasket, the gasket being located between the pressure-sensitive electrode and the housing, the opening of the first blocking recess being closed by one side of the gasket. Alternatively, at least one of opposite sides of the gasket and the housing is provided with a second blocking groove. Alternatively, the second blocking groove surrounds the welding boss. Alternatively, the second blocking groove is in a closed ring shape. As an alternative, pouring sealant is poured between the piezoresistor and the shell. The invention also provides a surge protector, which comprises the piezoresistor assembly. The beneficial effects of the invention are as follows: according to the pressure-sensitive electrode, the piezoresistor assembly and the surge protector, the connecting side of the electrode body is attached to the gasket, an intrusion section is formed between the connecting side and the gasket, the direction from the welding boss to the edge of the electrode body in the intrusion section is the intrusion direction, and the first blocking groove can block the capillary phenomenon water absorption path of liquid water in the intrusion direction. By the arrangement, moisture (liquid condensation) can be effectively prevented from flowing to the edge of the ceramic of the piezoresistor along the surface of the electrode body, and the piezoresistor is prevented from being damped and failed in short circuit. Drawings In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these d