CN112054496B

CN112054496B - Surge protection module

Info

Publication number: CN112054496B
Application number: CN202010921804.0A
Authority: CN
Inventors: 曹元庭
Original assignee: Shanghai Shanti Electronic Technology Co ltd
Current assignee: Shanghai Shanti Electronic Technology Co ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2022-06-03
Anticipated expiration: 2040-09-04
Also published as: CN112054496A

Abstract

The invention discloses a surge protection module, which comprises a piezoresistor; the welding device comprises a shell, an assembly shell, a welding sheet, a welding pin, a first electrode sheet and a metal pressing sheet; a first groove is formed in one side of the assembling shell, the welding sheet, the piezoresistor and the first electrode sheet are sequentially overlapped and placed in the first groove, and the welding sheet is located at the bottom; the metal pressing sheet tightly presses the first electrode sheet in the first groove in a detachable connection mode, so that the welding sheet and the first electrode sheet are respectively tightly attached to two sides of the piezoresistor; the side of the welding piece is provided with a boss, the bottom of the first groove is provided with a notch exposing the boss, one end of the welding pin is connected with the boss in a welding mode, and then a tripping point is formed at the welding connection point. The invention avoids the problem that heat is absorbed by the piezoresistor during welding, enhances the protection of the electrical property of the piezoresistor and simultaneously alleviates the problem of limited use.

Description

Surge protection module

Technical Field

The invention relates to the field of surge protectors, in particular to a surge protection module.

Background

SPD is a surge protector, also called lightning protector, and is an electronic device for providing safety protection for various electronic equipment, instruments and meters and communication lines. When the peak current or the voltage is suddenly generated in the electric loop or the communication line due to the external interference, the surge protector can conduct and shunt in a very short time, so that the damage of the surge to other equipment in the loop is avoided.

The on-board SPD tripping structure commonly used in the market at present is an integrated structure, and the tripping principle is that a piezoresistor and a low-temperature welding point of a pin of the piezoresistor are heated by current to melt the low-temperature welding point so as to achieve the purpose of tripping of the pin in an automatic separation manner. The existing tripping structure is characterized in that a first electrode plate and a piezoresistor are combined and encapsulated or fastened through a crimping screw, and a pin of the first electrode plate is reserved, and then the pin of the first electrode plate and a tripping elastic sheet are welded by using low-temperature soldering tin.

In addition, in order to ensure that the pins of the tripping elastic sheet and the first electrode plate can be smoothly separated, a blocking plate is arranged in the prior art. The blocking plate tightly pushes the welding point between the tripping elastic sheet and the pin through the spring, and once the welding point is melted, the blocking plate swings to the position between the tripping elastic sheet and the pin under the action of the pulling force or the elastic force of the spring, so that the tripping elastic sheet and the pin are forcibly separated, and the problem of 'lotus root broken wire connection' of the tripping elastic sheet and the pin is avoided. However, the spring itself takes up a large amount of space, so that the housing must be made larger in volume. The volume of the casing is too large, so that the casing cannot be applied to some narrow circuits and is limited in use.

Disclosure of Invention

The defect in the prior art is overcome, so that the problem that heat is absorbed by the piezoresistor during welding is avoided, the protection on the electrical property of the piezoresistor is enhanced, and the problem of limited use is alleviated. The invention provides a surge protection module, which comprises a piezoresistor; the welding device comprises a shell, an assembly shell, a welding sheet, a welding pin, a first electrode sheet and a metal pressing sheet;

a first groove is formed in one side of the assembling shell, the welding sheet, the piezoresistor and the first electrode sheet are sequentially overlapped and placed in the first groove, and the welding sheet is located at the bottom; the metal pressing sheet tightly presses the first electrode sheet in the first groove in a detachable connection mode, so that the welding sheet and the first electrode sheet are respectively tightly attached to two sides of the piezoresistor;

a boss is arranged on the side face of the welding sheet, a notch exposing the boss is formed in the bottom of the first groove, one end of the welding pin is connected with the boss in a welding mode, and a tripping point is formed at the welding connection point;

the assembling shell is detachably mounted in the shell and the other end of the welding pin extends out of the shell.

The invention has the beneficial effects that:

can the split between shell and the assembly casing, tear down the metal preforming back, weld piece, piezo-resistor and first electrode piece also can the split, will weld the one end of pin and carry out welded connection alone with the boss after the split to reduce the heat that the welding produced as far as possible and scatter and disappear, guarantee soldering tin mobility, reduce the possibility that the rosin joint appears. In addition, heat generated by welding cannot be transferred to the piezoresistor, the electrical performance of the piezoresistor can be avoided, and the normal work of the piezoresistor is ensured as far as possible.

Preferably, the welding pins and the bosses are connected through low-temperature tin wire welding with the melting point of 143 ℃.

According to the line standard, a solder wire with the melting point of 143 ℃ is adopted for welding, so that the normal tripping of the tripping point is ensured.

Preferably, the first electrode plate is provided with a connection pin, and the connection pin extends out of the housing.

The connecting pins and the welding pins are respectively and electrically connected to two poles of the piezoresistor, and the piezoresistor is conveniently and electrically connected to a circuit through the connecting pins and the welding pins.

Preferably, the metal pressing plate is detachably connected with the assembling housing through screws or bolts.

Preferably, the shape of the metal tablet is rectangular; the screws or the bolts are provided with four screws or bolts distributed at four corners of the metal pressing sheet.

The assembly shell is provided with four threaded holes, four corners of the metal pressing sheet are provided with four through holes, and screws or bolts penetrate through the through holes and then are screwed in the corresponding threaded holes. Four screws or bolts are distributed in a rectangular shape, and the pressing force of the metal pressing sheet is ensured to be uniform.

Preferably, the shape of shell and assembly casing is the rectangle, and assembly casing and the inner chamber of shell adaptation.

Preferably, the housing is provided with an opening at one side, and the assembling housing is inserted into the housing through the opening, so that the housing and the assembling housing form a detachable connection mode.

The opening is convenient for installing the assembly shell, the connecting pins and the welding pins also extend out of the opening, and the situation that other openings are formed in the shell independently is avoided, so that the processing steps are reduced.

Preferably, a second groove is formed in the other side of the assembling shell and communicated with the notch.

The first groove and the second groove are respectively positioned on two sides of the assembling shell, the first groove and the second groove are separated through a partition plate, and the notch is positioned in the middle of the partition plate.

Preferably, the fitting housing includes a first housing and a second housing; the first shell and the second shell are detachably connected, and the first groove and the second groove are divided into two parts respectively by detaching the first shell and the second shell.

Divide into first casing and second casing with the assembly casing, avoid welding piece, piezo-resistor and the inconvenient separation of first electrode slice card in first recess, the dismouting is more convenient.

Preferably, the first housing and the second housing are detachably connected by a snap.

Preferably, a second electrode plate is arranged between the welding sheet and the piezoresistor.

The first electrode plate and the second electrode plate cover the two sides of the piezoresistor respectively to absorb impact current and avoid sparking.

Preferably, the device further comprises a blocking plate which is connected in the second groove in a swinging mode; the blocking plate is tightly propped against the tripping point through a torsion spring.

Preferably, a fixed shaft is arranged in the second groove, and the blocking plate and the torsion spring are sleeved on the fixed shaft; one end of the torsion spring is tightly propped against the side wall of the second groove, the other end of the torsion spring is tightly propped against the side plate of the blocking plate, and the side plate is pushed by the elasticity of the torsion spring so that the blocking plate is tightly propped against the tripping point.

When peak current or voltage is suddenly generated in the circuit, the tripping point is quickly melted, and at the moment, the blocking plate is cut into the space between the welding pin and the boss for welding under the action of the elasticity of the torsion spring, so that the welding pin and the boss are completely separated for welding. Because the blocking plate is insulated, even if the coupling-off wire connection occurs between the welding pin and the boss welding, the blocking plate can be cut off, the complete insulation effect is achieved, and the protection on other equipment in the loop is further improved.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

FIG. 1 is a schematic structural diagram of the present embodiment;

FIG. 2 is a schematic structural diagram of the middle assembling housing of the present embodiment;

fig. 3 is a schematic structural diagram of a first electrode plate and a connection pin in this embodiment;

FIG. 4 is a left side view of FIG. 3;

fig. 5 is a schematic view of the assembled concealed housing of fig. 1.

In the drawing, a piezoresistor 1, a shell 2, an assembly shell 3, a welding sheet 4, a welding pin 5, a first electrode sheet 6, a metal pressing sheet 7, an opening 8, a first groove 9, a second groove 10, a partition plate 11, a notch 12, a screw or bolt 13, a boss 14, a connecting pin 15, a first shell 16, a second shell 17, a second electrode sheet 18, a blocking plate 19, a torsion spring 20, a fixed shaft 21 and a side plate 22.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

As shown in fig. 1, the present embodiment provides a surge protection module including a varistor 1, a case 2, an assembly case 3, a weld tab 4, a weld pin 5, a first electrode tab 6, and a metal pressure piece 7. Wherein the shape of shell 2 and assembly casing 3 is the rectangle, and assembly casing 3 and the inner chamber adaptation of shell 2. And one side of the housing 2 is provided with an opening 8, and the mounting case 3 is inserted into the housing 2 through the opening 8, thereby forming a detachable connection manner of the housing 2 and the mounting case 3. The opening 8 is convenient for installing the assembling shell 3, and the connecting pins 15 and the welding pins 5 also extend out of the opening 8, so that the situation that other openings 8 are separately formed in the shell 2 is avoided, and the processing steps are reduced.

As shown in fig. 2, the fitting housing 3 is provided at opposite sides thereof with a first groove 9 and a second groove 10, respectively, and the first groove 9 and the second groove 10 are separated by a partition 11. The welding sheet 4, the piezoresistor 1 and the first electrode sheet 6 are sequentially overlapped and placed in the first groove 9, and the welding sheet 4 is positioned at the bottom; the metal pressing sheet 7 compresses the first electrode sheet 6 in the first groove 9 in a detachable connection mode, and then the welding sheet 4 and the first electrode sheet 6 are respectively attached to two sides of the piezoresistor 1. Specifically, the metal presser 7 is detachably attached to the fitting housing 3 by screws or bolts 13. The metal pressing sheet 7 is rectangular; the screws or bolts 13 are provided with four screws or bolts 13 distributed at four corners of the metal pressing plate 7. The assembly shell 3 is provided with four threaded holes, four corners of the metal pressing sheet 7 are provided with four through holes, and screws or bolts 13 are screwed in the corresponding threaded holes after penetrating through the through holes. The four screws or bolts 13 are distributed in a rectangular shape, so that the pressing force of the metal pressing sheet 7 is uniform. In addition, a second electrode sheet 18 is provided between the welding sheet 4 and the varistor 1. The first electrode plate 17 and the second electrode plate 18 cover both sides of the varistor 1 respectively, and are used for absorbing impact current and avoiding the problem of sparking.

And the side of the welding sheet 4 is provided with a special boss 14 for welding, the bottom of the first groove 9 is provided with a notch 12 exposing the boss 14, namely, the notch 12 communicates the first groove 9 with the second groove 10, and the notch 12 is positioned in the middle of the partition 11. One end of the welding pin 5 is connected with the lug boss 14 in a welding mode, and a tripping point is formed at the welding connection point. In order to realize normal tripping, the welding pin 5 is connected with the boss 14 through low-temperature tin wire welding with the melting point of 143 ℃. According to the line standard, a solder wire with the melting point of 143 ℃ is adopted for welding. The other end of the soldering pin 5 protrudes from the opening 8 of the housing 2, and as shown in fig. 3 and 4, the first electrode tab 6 is provided with a connection pin 15 and the connection pin 15 also protrudes from the opening 8 of the housing 2. The connecting pin 15 and the welding pin 5 are respectively electrically connected to two poles of the piezoresistor 1, and the piezoresistor 1 is conveniently and electrically connected into a circuit through the connecting pin 15 and the welding pin 5.

As shown in fig. 1 and 5, in this embodiment, the housing 2 and the assembly housing 3 can be separated, after the metal pressing sheet 7 is removed, the welding sheet 4, the varistor 1 and the first electrode sheet 6 can also be separated, and after the separation, one end of the welding pin 5 and the boss 14 are separately welded and connected, so that heat loss generated by welding is reduced as much as possible, solder fluidity is ensured, and the possibility of occurrence of cold solder is reduced. In addition, the heat generated by welding can not be transferred to the piezoresistor 1, the electrical performance of the piezoresistor 1 can be avoided, and the normal work of the piezoresistor 1 can be ensured as far as possible. And, for more convenient disassembly and assembly, the assembly housing 3 includes a first housing 16 and a second housing 17. The first shell 16 and the second shell 17 are detachably connected through a buckle, and the first shell 16 and the second shell 17 are separated so that the first groove 9 and the second groove 10 are respectively divided into two parts. Divide into first casing 16 and second casing 17 with assembly housing 3, avoid welding piece 4, piezo-resistor 1 and first electrode piece 6 card inconvenient separation in first recess 9, the dismouting is more convenient.

As shown in fig. 1, in order to avoid the phenomenon of "coupling wire breakage" after the welding point is melted, the welding tin is melted and becomes wire-shaped and is connected between one end of the welding pin and the boss. The embodiment further comprises a blocking plate 19 which is connected in the second groove 10 in a swinging mode, and the blocking plate 19 is tightly propped against the tripping point through a torsion spring 20. Further, a fixing shaft 21 is arranged in the second groove 10, and the blocking plate 19 and the torsion spring 20 are both sleeved on the fixing shaft 21. One end of the torsion spring 20 is tightly pressed against the side wall of the second groove 10, and the other end of the torsion spring is tightly pressed against the side plate 22 of the blocking plate, and the side plate 22 is pushed by the elasticity of the torsion spring 20 to make the blocking plate 19 tightly pressed against the trip point.

When peak current or voltage is suddenly generated in the circuit, the tripping point is quickly melted, and at the moment, the blocking plate swings at a certain angle under the action of the elasticity of the torsion spring and is cut into the space between the welding pin and the boss for welding, so that the welding pin and the boss are completely separated for welding. Because the blocking plate is insulated, even if the coupling-off wire connection occurs between the welding pin and the boss welding, the blocking plate can be cut off, the complete insulation effect is achieved, and the protection on other equipment in the loop is further improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims

1. A surge protection module comprises a piezoresistor; the method is characterized in that: the welding device comprises a shell, an assembly shell, a welding sheet, a welding pin, a first electrode sheet and a metal pressing sheet;

a first groove is formed in one side of the assembling shell, the welding sheet, the piezoresistor and the first electrode sheet are sequentially overlapped and placed in the first groove, and the welding sheet is located at the bottom; the metal pressing sheet is tightly pressed on the first electrode sheet in the first groove in a detachable connection mode, so that the welding sheet and the first electrode sheet are respectively tightly attached to two sides of the piezoresistor;

the assembling shell is detachably mounted in the shell, and the other end of the welding pin extends out of the shell;

a second groove is formed in the other side of the assembling shell and communicated with the notch; the blocking plate is connected in the second groove in a swinging mode; the blocking plate is tightly propped against the tripping point through a torsion spring.

2. A surge protection module according to claim 1, wherein: the welding pins and the bosses are connected through low-temperature welding tin wires with the melting point of 143 ℃.

3. A surge protection module according to claim 1, wherein: the first electrode plate is provided with a connecting pin, and the connecting pin extends out of the shell.

4. A surge protection module according to claim 1, wherein: the metal pressing sheet is detachably connected with the assembling shell through screws or bolts.

5. A surge protection module according to claim 4, wherein: the metal pressing sheet is rectangular; the screws or the bolts are provided with four screws or bolts distributed at four corners of the metal pressing sheet.

6. A surge protection module according to claim 1, wherein: the shape of shell and assembly casing is the rectangle, and the inner chamber adaptation of assembly casing and shell.

7. A surge protection module according to claim 2, wherein: one side of the shell is provided with an opening, and the assembling shell is inserted into the shell through the opening, so that the shell and the assembling shell form a detachable connection mode.

8. A surge protection module according to claim 1, wherein: a fixed shaft is arranged in the second groove, and the blocking plate and the torsion spring are sleeved on the fixed shaft; one end of the torsion spring is tightly propped against the side wall of the second groove, the other end of the torsion spring is tightly propped against the side plate of the blocking plate, and the side plate is pushed by the elasticity of the torsion spring so that the blocking plate is tightly propped against the tripping point.