Piezoresistor structure capable of detecting state and assembling method thereof

Abstract

The invention discloses a piezoresistor structure capable of detecting a state and an assembling method thereof. The piezoresistor structure capable of detecting the state comprises a piezoresistor and a shell, the piezoresistor comprises a resistor body and a pin connected with the resistor body; the shell comprises a main body frame, two side deformation plates and a sealing cover plate; the main body frame is of a U-shaped hollow structure, the two side surface deformation plates are respectively arranged on two side surfaces of the main body frame, the main body frame and the two side surface deformation plates jointly form an accommodating cavity, the resistor body is accommodated in the accommodating cavity, the sealing cover plate blocks the bottom of the main body frame, and the pins are arranged on the sealing cover plate in a penetrating manner and extend out of the accommodating cavity; wherein AB glue is poured into the containing cavity. According to the piezoresistor structure capable of detecting the state and the assembly method of the piezoresistor structure, a maintainer can quickly and effectively judge which piezoresistor in a circuit fails, so that the maintenance efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of varistor technology, and in particular to a varistor structure capable of detecting a state and an assembly method thereof. Background Art

[0002] A varistor, short for voltage-sensitive resistor, is a nonlinear resistor. The resistance of a varistor is related to the voltage applied across it. When the voltage applied to the varistor is within its nominal value, its resistance is infinite, and almost no current flows through it. When the voltage across the varistor is slightly greater than the nominal voltage, the varistor quickly breaks down and conducts, rapidly decreasing its resistance and placing it in the on state. When the voltage decreases below the nominal voltage, its resistance begins to increase again, and the varistor returns to a high-resistance state. When the voltage across the varistor exceeds its maximum voltage limit, it will completely break down and become damaged, unable to recover on its own.

[0003] During the design of some high-end circuits, at customer request, a casing is installed around the varistor to protect and isolate it. However, if a varistor fails, maintenance personnel cannot quickly and effectively determine which varistor in the circuit has failed because it is enclosed by the casing. They must remove the casing from each varistor and perform a thorough inspection, which is extremely time-consuming and labor-intensive.

[0004] Therefore, how to design a varistor structure with detectable status so that maintenance personnel can quickly and effectively determine which varistor in the circuit has failed and improve maintenance efficiency is a technical problem that needs to be solved. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a varistor structure with detectable status and an assembly method thereof, so that maintenance personnel can quickly and effectively determine which varistor in the circuit has failed, thereby improving maintenance efficiency.

[0006] The object of the present invention is achieved through the following technical solutions: A state-detectable varistor structure includes: a varistor and a shell; The varistor includes a resistor body and a pin connected to the resistor body; The housing includes: a main frame, two side deformation plates, and a sealing cover plate; the main frame is a "U"-shaped hollow structure, the two side deformation plates are respectively arranged on the two sides of the main frame, the main frame and the two side deformation plates together form a accommodating cavity, the resistor body is accommodated in the accommodating cavity, the sealing cover plate blocks the bottom of the main frame, and the pins are passed through the sealing cover plate and extend out of the accommodating cavity; Wherein, AB glue is poured into the accommodating cavity.

[0007] In one embodiment, The side deformation plate has an outer end surface facing away from the accommodating cavity and an inner end surface facing the accommodating cavity, and the side deformation plate forms a groove, and the groove is recessed from the outer end surface to the inner end surface; The inner end surface is attached to the plane of the resistor body, and an AB glue filling groove is opened on the inner end surface.

[0008] In one embodiment, a through hole is formed on the sealing cover plate, and the pin is passed through the through hole.

[0009] In one embodiment, the housing is a plastic structure.

[0010] In one embodiment, a limiting guide groove is provided on the main frame, and the side deformation plate and the sealing cover plate are clamped in the limiting guide groove.

[0011] A method for assembling a varistor structure, for assembling the above-mentioned varistor structure capable of detecting a state, comprises the following steps: Step 1: Obtain a varistor and a housing, wherein the housing includes: a main frame, two side deformation plates, and a sealing cover plate; Step 2: Install two side deformation plates on two sides of the main frame to form a receiving cavity; Step 3: First, pour the molten AB glue into the accommodating cavity, and then insert the resistor body into the accommodating cavity and wrap it with the AB glue; Step 4: After the AB glue is solidified, seal the bottom of the main frame with a sealing cover plate, and the pins pass through the sealing cover plate and extend to the outside of the accommodating cavity.

[0012] The present invention provides a state-detectable varistor structure and an assembly method thereof, so that maintenance personnel can quickly and effectively determine which varistor in a circuit has failed, thereby improving maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 An assembly diagram of a state-detectable piezoresistive structure according to an embodiment of the present invention; Figure 2 for Figure 1 An exploded view of the state-detectable piezoresistive structure shown; Figure 3 for Figure 1 A perspective cross-sectional view of a piezoresistive structure showing a detectable state; Figure 4 for Figure 1 A planar cross-sectional view of a piezoresistive structure showing a detectable state; Figure 5 for Figure 2 The structural diagram of the side deformation plate shown in (1); Figure 6 for Figure 2 The structural diagram of the side deformation plate shown in (2). DETAILED DESCRIPTION

[0015] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0016] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0018] like Figure 1 As shown, the present invention discloses a state-detectable varistor structure 10 , which includes: a varistor 100 and a housing 200 .

[0019] like Figure 2 and Figure 3 As shown, the varistor 100 includes a resistor body 110 and a pin 120 connected to the resistor body 110 .

[0020] like Figure 2 and Figure 3 As shown, the housing 200 includes a main frame 210, two side deformable plates 220, and a sealing cover 230. The main frame 210 is a U-shaped hollow structure. The two side deformable plates 220 are respectively provided on two sides of the main frame 210. The main frame 210 and the two side deformable plates 220 together form a receiving cavity 240. The resistor body 110 is accommodated in the receiving cavity 240. The sealing cover 230 blocks the bottom of the main frame 210. The pins 120 are provided through the sealing cover 230 and extend out of the receiving cavity 240.

[0021] The accommodating cavity 240 is filled with AB glue 300 (such as Figure 4 shown).

[0022] The specific structure of the side deformation plate 220 is described below: like Figure 5 and Figure 6 As shown, the side deformation plate 220 has an outer end surface 221 facing away from the accommodating cavity 240 and an inner end surface 222 facing the accommodating cavity 240. The side deformation plate 220 forms a groove 223, which is recessed from the outer end surface 221 to the inner end surface 222. The inner end surface 222 is attached to the plane of the resistor body 110, and an AB glue filling groove 224 is opened on the inner end surface 222 (such as Figure 6 shown).

[0023] The working principle of the above-mentioned state-detectable piezoresistive structure 10 is described below: First, it should be noted that when a varistor fails, it mainly manifests itself as expansion deformation or rapid temperature rise, or even easily explodes due to high voltage. Based on these characteristics, the present invention has made a targeted design for the structure of the housing 200. Regardless of whether the varistor fails and exhibits expansion deformation, rapid temperature rise, or high voltage explosion, the varistor of the present invention can effectively cope with it, achieving rapid and effective detection and ensuring safety. When the varistor fails and expands and deforms, the inner end surface 222 is attached to the plane of the resistor body 110, which squeezes the inner end surface 222 of the side deformation plate 220, causing the inner end surface 222 to deform, making it easy for maintenance personnel to observe. When the varistor fails and the temperature rises rapidly, the solid AB glue in the accommodating cavity 240 melts due to the heat. The melted AB glue increases in volume and squeezes the two side deformation plates 220, causing the two side deformation plates 220 to deform, making it easy for maintenance personnel to observe. It can be seen that whether the varistor fails and expands and deforms, or the varistor fails and heats up rapidly, the varistor of the present invention can effectively deal with both, making it easier for maintenance personnel to quickly find the problematic component. The side deformable plate 220 forms a groove 223, which is recessed from the outer end surface 221 to the inner end surface 222. When the side deformable plate 220 is deformed, the original groove 223 is lifted up, and the groove 223 forms a deformation buffer zone to prevent the deformed side deformable plate 220 from squeezing other electronic components. This is more friendly to dense circuit design. On the other hand, the groove 223 is recessed from the outer end surface 221 to the inner end surface 222. When the resistor body 110 is inserted into the accommodating cavity 240, the resistor body 110 will be clamped by the two grooves 223 and quickly positioned. When the varistor fails and the temperature rises rapidly, the AB glue in the AB glue filling groove 224 will first melt and then squeeze the inner end surface 222, causing the inner end surface 222 to deform, thereby improving the detection sensitivity. Furthermore, a transient high voltage may occur in the circuit, causing the varistor to fail and subsequently explode or break. However, the present invention pours AB glue 300 into the accommodating cavity 240. The AB glue 300 can effectively absorb the energy generated by the explosion or breakage, thereby improving the safety of the circuit. This is also one of the technical problems that designers need to solve when pouring AB glue into the cavity during design. It should also be noted that when the varistor fails and the temperature rises rapidly, the temperature rise may be short-lived and limited, making it difficult to melt all the AB glue 300 in the accommodating cavity 240. In order to better detect the failed varistor, the present invention also provides an AB glue filling groove 224 on the inner end surface 222. The AB glue filling groove 224 is filled with AB glue. When the varistor fails and the temperature rises rapidly, the AB glue in the AB glue filling groove 224 will first melt and then squeeze the inner end surface 222, causing the inner end surface 222 to deform, thereby improving the detection sensitivity.

[0024] In the present invention, the sealing cover plate 230 is provided with a through hole 231 (such as Figure 2 As shown), the pin 120 is arranged through the through hole 231.

[0025] In the present invention, the shell 200 is a plastic structure, and the main frame 210, two side deformation plates 220, and the sealing cover plate 230 are obtained by injection molding. The shell with a plastic structure also has a good insulation effect.

[0026] In the present invention, the main frame 210 is provided with a limited guide groove 211 (such as Figure 2 As shown in FIG, the side deformation plate 220 and the sealing cover plate 230 are clamped in the limiting guide groove 211.

[0027] The present invention also discloses a method for assembling a varistor structure, which is used to assemble the above-mentioned varistor structure capable of detecting a state, and comprises the following steps: Step 1: Obtain the varistor 100 and the housing 200, wherein the housing 200 includes: a main frame 210, two side deformation plates 220, and a sealing cover plate 230; Step 2: Install two side deformation plates 220 on two sides of the main frame 210 to form a receiving cavity 240; Step 3: First, molten AB glue 300 is poured into the accommodating cavity 240, and then the resistor body 110 is inserted into the accommodating cavity 240 and wrapped with the AB glue 300. It should be noted that the molten AB glue 300 is first poured into the accommodating cavity 240, and then the resistor body 110 is inserted into the accommodating cavity 240. This approach has the following advantages: when the resistor body 110 is inserted into the accommodating cavity 240, the resistor body 110 will squeeze the surrounding AB glue 300, allowing the AB glue 300 to more densely fill the entire accommodating cavity 240, preventing the occurrence of AB glue hollowing and improving the sensitivity of subsequent detection. Step 4: After the AB glue 300 is cured, the sealing cover plate 230 is used to seal the bottom of the main frame 210 . The pins 120 pass through the sealing cover plate 230 and extend to the outside of the accommodating cavity 240 .

[0028] The above-described embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A state-detectable piezoresistive structure, characterized in that: include: Varistor, housing; The varistor includes a resistor body and a pin connected to the resistor body; The housing includes: a main frame, two side deformation plates, and a sealing cover plate; the main frame is a "U"-shaped hollow structure, the two side deformation plates are respectively arranged on the two sides of the main frame, the main frame and the two side deformation plates together form a accommodating cavity, the resistor body is accommodated in the accommodating cavity, the sealing cover plate blocks the bottom of the main frame, and the pins are arranged through the sealing cover plate and extend out of the accommodating cavity; Wherein, AB glue is poured into the accommodating cavity.

2. The state-detectable piezoresistive structure according to claim 1, wherein: The side deformation plate has an outer end surface facing away from the accommodating cavity and an inner end surface facing the accommodating cavity, and the side deformation plate forms a groove, and the groove is recessed from the outer end surface to the inner end surface; The inner end surface is attached to the plane of the resistor body, and an AB glue filling groove is opened on the inner end surface.

3. The state-detectable piezoresistive structure according to claim 1, wherein: The sealing cover plate is provided with a through hole, and the pin is passed through the through hole.

4. The state-detectable piezoresistive structure according to claim 1, wherein: The shell is a plastic structure.

5. The state-detectable piezoresistive structure according to any one of claims 1 to 4, characterized in that: The main frame is provided with a limiting guide groove, and the side deformation plate and the sealing cover plate are clamped in the limiting guide groove.

6. A method for assembling a varistor structure, characterized in that: The method for assembling a piezoresistive resistor structure capable of detecting a state as claimed in any one of claims 1 to 5 comprises the following steps: Step 1: Obtain a varistor and a housing, wherein the housing includes: a main frame, two side deformation plates, and a sealing cover plate; Step 2: Install two side deformation plates on two sides of the main frame to form a receiving cavity; Step 3: First, pour the molten AB glue into the accommodating cavity, and then insert the resistor body into the accommodating cavity and wrap it with the AB glue; Step 4: After the AB glue is solidified, seal the bottom of the main frame with a sealing cover plate, and the pins pass through the sealing cover plate and extend to the outside of the accommodating cavity.

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