CN213243537U - Surge protection device with backup protection function - Google Patents

Abstract

The utility model discloses a surge protector with backup protection function, which comprises a bearing component, a shell and a support, wherein the shell is sleeved on the support; the protection assembly comprises a first conducting strip, a second conducting strip and a partition piece, wherein the partition piece is connected with the first conducting strip and the second conducting strip; the first conducting strip and the second conducting strip are inserted into the support; the thermal separation device of the surge protector can break the maximum expected short-circuit current when the surge protector fails in short circuit and avoid the surge protector from firing when breaking low short-circuit current.

Description

Surge protection device with backup protection function

Technical Field

The utility model belongs to the technical field of surge protector technique and specifically relates to a surge protector who possesses reserve protect function.

Background

Generally, a backup protection function is not provided, or the backup protection and a surge protection device are integrated into a whole, and an integrated circuit breaker or fuse is used for breaking the maximum expected short-circuit current; in order to realize full-range protection and no misoperation, surge current and power frequency short-circuit current respectively pass through different conductive loops; for example, CN201720036416.8 discloses a backup circuit breaker of surge protection device, which has a complex structure, a large volume and a high cost.

SUMMERY OF THE UTILITY MODEL

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, and in this section as well as in the abstract of the specification and the title of the application may be somewhat simplified or omitted to avoid obscuring the purpose of this section, the abstract of the specification and the title of the application, and such simplification or omission may not be used to limit the scope of the invention.

The present invention has been made in view of the above and/or other problems occurring in the prior art.

Therefore, the utility model aims to solve the technical problem that current equipment does not have reserve protect function, or the structure is bulky, problem that the functionality is poor.

In order to solve the technical problem, the utility model provides a following technical scheme: a surge protector with a backup protection function comprises a bearing assembly, a power supply assembly and a power supply assembly, wherein the bearing assembly comprises a shell and a support, and the shell is sleeved on the support;

the protection assembly comprises a first conducting strip, a second conducting strip and a partition piece, wherein the partition piece is connected with the first conducting strip and the second conducting strip;

the first conducting strip and the second conducting strip are inserted into the support.

As a spare protect function's surge protector's an preferred scheme possesses, wherein: the support comprises a first base and a second base, the second base is embedded into the first base, the first base comprises a first baffle and side plates, and the side plates are arranged on two sides of the first baffle;

the side plate is provided with a fastener on the outer side, one side of the shell is provided with an opening, one end of the side surface of the shell, which is close to the opening, is provided with a clamping hole, and the fastener is positioned in the clamping hole.

As a spare protect function's surge protector's an preferred scheme possesses, wherein: the first conducting strip comprises a first pin end and a first welding end, a first perforation is formed in the first pin end, the second conducting strip comprises a second pin end and a second welding end, and a second perforation is formed in the second pin end.

As a spare protect function's surge protector's an preferred scheme possesses, wherein: the partition piece comprises a separation rod, a metal piece, a voltage limiting body, an electrode and a spring, wherein one side of the voltage limiting body is connected with the first welding end, and the electrode is connected with the other side of the voltage limiting body.

As a spare protect function's surge protector's an preferred scheme possesses, wherein: the electrode is provided with a convex surface, the metal piece is connected with the convex surface, and the side of the convex surface is covered with an insulating encapsulating layer;

a first notch is formed in the release rod, and the metal piece is embedded in the first notch.

As a spare protect function's surge protector's an preferred scheme possesses, wherein: a rotating shaft is arranged on the side surface of the first baffle plate, a rotating hole and a connecting hole are formed in the separating rod, and the rotating hole is sleeved on the rotating shaft;

and a lug is further arranged on the electrode, one end of the spring is connected with the connecting hole, and the other end of the spring is connected with the lug.

As a spare protect function's surge protector's an preferred scheme possesses, wherein: the separation rod is also provided with a spacing bar and a web plate, a second notch is formed in the second welding end, the second welding end is arranged on the web plate, and the spacing bar abuts against the second notch;

and a folded edge is arranged on the side edge of the second welding end.

As a spare protect function's surge protector's an preferred scheme possesses, wherein: the side face of the metal piece is provided with a hot melt alloy layer, and the metal piece is welded with the protruding face and the second welding end through the hot melt alloy layer.

As a spare protect function's surge protector's an preferred scheme possesses, wherein: the side wall of the shell is provided with an inner groove, the side wall of the shell is also provided with a lug, and the distance between the lug and the insulating encapsulating layer is equal to or more than the thickness of the spoke plate; the power frequency short circuit point of the pressure limiting body is arranged at a proper position relative to the convex surface.

As a spare protect function's surge protector's an preferred scheme possesses, wherein: the overlapped edges of the convex pieces and the inner grooves comprise a first transverse surface, a first inclined surface and a first vertical surface; the second welding end is also provided with a second transverse surface, a second inclined surface and a second vertical surface;

the second transverse surface is arranged corresponding to the first transverse surface, the second inclined surface is arranged corresponding to the first inclined surface, and the second vertical surface is arranged corresponding to the first vertical surface;

the top of the shell is also provided with an observation port;

the end part of the separation rod is also provided with an indicating end which is folded towards the upper end of the pressure limiting body.

The utility model has the advantages that: the thermal separation device of the surge protector can break the maximum expected short-circuit current when the surge protector fails in short circuit and avoid the surge protector from firing when breaking low short-circuit current.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor. Wherein:

fig. 1 is a schematic view of an overall structure of a surge protection device with a backup protection function according to an embodiment of the present invention;

fig. 2 is a schematic diagram of an overall explosion structure of a surge protection device with a backup protection function according to an embodiment of the present invention;

fig. 3 is a schematic diagram of an explosion structure of a bearing assembly in a surge protector with a backup protection function according to an embodiment of the present invention;

fig. 4 is a schematic view of a butt structure between a lug and a second welding end in a surge protector with a backup protection function according to an embodiment of the present invention;

fig. 5 is a schematic view of a placement structure of a first conductive sheet and a second conductive sheet in a surge protector with a backup protection function in a first base according to an embodiment of the present invention;

fig. 6 is a schematic view of a connection structure of a protection component in a surge protector with a backup protection function according to an embodiment of the present invention;

fig. 7 is a schematic view of a connection structure of a surge protector with a backup protection function according to an embodiment of the present invention, in which a second conductive strip protection assembly is removed;

fig. 8 is a schematic cross-sectional view of a spacer connection structure in a surge protector with a backup protection function according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a side structure of a housing in a surge protector with a backup protection function according to an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying the present invention are described in detail below with reference to the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Next, the present invention will be described in detail with reference to the schematic drawings, and in the detailed description of the embodiments of the present invention, for convenience of illustration, the sectional view showing the device structure will not be enlarged partially according to the general scale, and the schematic drawings are only examples, and should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.

Further still, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with at least one implementation of the invention is included. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

Example 1

Referring to fig. 1 to 9, the embodiment provides a surge protector with a backup protection function, including a bearing assembly 100, including a housing 101 and a support 300, where the housing 101 is sleeved on the support 300;

the protective assembly 200 comprises a first conductive sheet 201, a second conductive sheet 202 and a partition 203, wherein the partition 203 is connected with the first conductive sheet 201 and the second conductive sheet 202;

the first conductive plate 201 and the second conductive plate 202 are inserted into the support 300.

The support 300 comprises a first base 102 and a second base 103, the second base 103 is embedded in the first base 102, the first base 102 comprises a first baffle plate 102a and side plates 102b, and the side plates 102b are arranged on two sides of the first baffle plate 102 a;

a buckle 102c is arranged outside the side plate 102b, an opening 101a is arranged on one surface of the shell 101, an engaging hole 101b is arranged at one end of the side surface of the shell 101 close to the opening 101a, and the buckle 102c is positioned in the engaging hole 101 b.

The first conductive sheet 201 includes a first pin end 201a and a first soldering end 201b, the first pin end 201a is provided with a first through hole 201c, the second conductive sheet 202 includes a second pin end 202a and a second soldering end 202b, and the second pin end 202a is provided with a second through hole 202 c.

The partition 203 comprises a release rod 203a, a metal piece 203b, a voltage limiting body 203c, an electrode 203d and a spring 203e, wherein one side of the voltage limiting body 203c is connected with the first welding end 201b, and the electrode 203d is connected with the other side of the voltage limiting body 203 c.

A raised surface 203d-1 is arranged on the electrode 203d, the metal piece 203b is connected with the raised surface 203d-1, and the side of the raised surface 203d-1 is covered with an insulating encapsulating layer;

the release rod 203a is provided with a first notch 203a-5, and the metal piece 203b is embedded in the first notch 203 a-5.

The side surface of the first baffle plate 102a is provided with a rotating shaft 102g, the release rod 203a is provided with a rotating hole 203a-1 and a connecting hole 203a-2, and the rotating hole 203a-1 is sleeved on the rotating shaft 102 g;

the electrode 203d is further provided with a lug 203d-2, one end of the spring 203e is connected with the connecting hole 203a-2, and the other end is connected with the lug 203 d-2.

The separation rod 203a is also provided with a division bar 203a-3 and a spoke plate 203a-6, the second welding end 202b is provided with a second notch 202b-1, the second welding end 202b is arranged on the spoke plate 203a-6, and the division bar 203a-3 is abutted against the second notch 202 b-1;

the second welding end 202b is provided with a flange 202b-2 at a side thereof.

The flange 202b-2 serves to increase the overall strength of the second welding end 202 b.

The side surface of the 0 metal piece 203b is provided with a thermal fusion gold layer, and the metal piece 203b is welded with the convex surface 203d-1 and the second welding end 202b through the thermal fusion gold layer.

The side wall of the shell 101 is provided with an inner groove 101d, the side wall of the shell 101 is also provided with a lug 101e, and the distance between the lug 101e and the insulating packaging layer is equal to or larger than the thickness of the spoke plate 203 a-6; the power frequency short circuit point of the voltage limiting body 203c is arranged at the position right opposite to the convex surface 203 d-1.

The overlapped side of the convex piece 101e and the inner groove 101d comprises a first transverse surface 101f, a first inclined surface 101g and a first vertical surface 101 h; the second welding end 202b is also provided with a second transverse surface 202b-3, a second inclined surface 202b-4 and a second vertical surface 202 b-5;

the second transverse surface 202b-3 is arranged corresponding to the first transverse surface 101f, the second inclined surface 202b-4 is arranged corresponding to the first inclined surface 101g, and the second vertical surface 202b-5 is arranged corresponding to the first vertical surface 101 h;

the top of the shell 101 is also provided with an observation port 101 c;

the end of the disengaging rod 203a is also provided with an indicating end 203a-4, and the indicating end 203a-4 is folded towards the upper end of the pressure limiting body 203 c.

The side of the second base 103 is provided with a plug-in post 103a, the side of the first baffle 102a is provided with a plug-in hole 102d, and the plug-in post 103a and the plug-in hole 102d are oppositely arranged and correspond in position.

The first baffle plate 102a is provided with a first slot 102e and a second slot 102f, the first pin end 201a is arranged in the first slot 102e, and the second pin end 202a is arranged in the second slot 102 f;

the plug post 103a includes a first plug shaft 103a-1 and a second plug shaft 103a-2, the plug hole 102d includes a first insertion hole 102d-1 and a second insertion hole 102d-2, the first plug shaft 103a-1 is inserted into the first insertion hole 102d-1 through the first penetration hole 201c, and the second plug shaft 103a-2 is inserted into the second plug shaft 103a-2 through the second penetration hole 202 c.

In the present embodiment, one or two overvoltage limiting elements connected in parallel and located in one structural unit are arranged in the device housing 101; the whole device is connected into a power supply system through a first conducting strip 201 and a second conducting strip 202; specifically, the overvoltage limiting element is a combined structure of an electrode 203d, a voltage limiting body 203c and a first conducting strip 201; the voltage limiter 203c may be a voltage dependent resistor, which exhibits low resistance at high voltage and can conduct current; the thermal disconnecting means includes a disconnecting lever 203a, a metal member 203b, and a spring 203e, disconnects the surge protector from the power supply system when the overvoltage limiting element is short-circuited, and is provided with an indicating portion, i.e., a view port 101c and an indicating terminal 203a-4, which indicates the operation and failure state of the overvoltage protector.

The electrode 203d of the overvoltage limiting component is provided with a raised surface 203d-1, and the raised surface 203d-1 is spaced from or coplanar with the insulating encapsulation surface on the electrode 203 d. The welding end of the second conductive sheet 202 is welded to the convex surface 203d-1 of the overvoltage limiting element by a metal member 203b and a hot-melt alloy, and the metal member 203b is embedded in a release rod 203a made of a gas-generating insulating material.

When the hot-melt alloys on the inner surface and the outer surface of the metal piece 203b are melted synchronously, the separating rod 203a rotates under the action of the tension spring to enable the metal piece 203b to leave the initial position, the initial position is the position corresponding to the welding of the metal piece 203b and the convex surface 203d-1, the initial position is inserted between the welding end and the convex surface 203d-1 of the electrode 203d, the arc generated between the second conducting strip 202 and the overvoltage limiting element is lengthened and cut off, and the barrier is cut off. The clearance between the separation rod 203a and the surface of the electrode 203d and the clearance between the separation rod and the inner side wall of the shell 101 are very small, namely the distance between the outer side surface of the division bar 203a-3 and the outer side surface of the convex piece 101e is very small, when the separation rod 203a rotates, the separation rod rapidly elongates and forces the electric arc to enter the two very small insulation clearances, the electric arc is cooled by the double surfaces of the insulation material and the gas of the gas generating material, the voltage gradient is very high, and the narrow-slit arc extinction is realized.

The maximum expected short circuit current through the failed surge protector will cause the electrode 203d soldered to the overvoltage limiting element to increase in temperature substantially less than the second conductive tab 202 in the event of an overvoltage limiting element having a much greater thermal capacity than the second conductive tab 202. The thermal resistances of the electrode 203d, the metal member 203b and the second conductive sheet 202 in the overvoltage limiting element must be matched to synchronously melt the hot-melt alloy on the inner surface and the outer surface of the metal member 203b, so that the barrier breaking is realized.

The specific implementation mode is as follows: increasing the thermal resistance of the electrode 203d of the overvoltage limiting element to the convex surface 203d-1 (increasing the height of the convex surface 203d-1 of the electrode 203d, or reducing the cross-sectional area of the convex surface 203d-1 connected with the other part of the electrode 203d, the electrode 203d is made of a material with low thermal conductivity or low electrical conductivity); increasing the thermal resistance from the convex surface 203d-1 to the metal piece 203b (increasing the area of the convex surface 203d-1 of the electrode 203d or reducing the sectional area of the convex surface 203 d-1); the interface thermal resistance of the convex surface 203d-1 of the metal piece 203b and the electrode 203d is increased; the thermal resistance of the second conductive sheet 202 is reduced (the length of the second conductive sheet 202 is reduced, the sectional area is increased appropriately, and the second conductive sheet 202 is made of a material with high thermal conductivity or high electrical conductivity), so that the interface thermal resistance between the metal piece 203b and the second conductive sheet 202 is reduced.

When low short-circuit current passes through the surge protector, the temperature rise speed of the short-circuit breakdown point of the overvoltage limiting element is far higher than that of the thermal disconnecting device at the disconnection position, and the device cannot act in time, so that the surge protector is an important reason for firing. It is necessary to control the temperature difference between the short circuit breakdown point and the device off position. The specific implementation mode is as follows: the thermal cutoff position of the device is set on the convex surface 203d-1 of the electrode 203d of the overvoltage limiting element, and the short circuit breakdown point of the overvoltage limiting element is set at a suitable position on the convex surface 203d-1 of the electrode 203d, preferably at a position facing the convex surface 203 d-1. This also prevents the overvoltage limiting element from being damaged by the short circuit breakdown, which may result in the thermal trip device not operating properly (e.g., the spring 203e is blown and foreign objects seize the rotational path of the trip lever 203 a).

The trip lever 203a moves from the initial position to the tripped position, the indicator portion of which, indicator end 203a-4, appears at the viewing port 101c, indicating that the device is in a failed state.

By adopting the technology of barrier breaking and narrow slit arc extinguishing, the thermal disengaging device of the surge protector can break the maximum expected short-circuit current when the surge protector fails in short circuit; thermal resistance matching of the thermal separation device is realized, and the barrier is disconnected; the hot melting disconnection position of the thermal release device is arranged at a proper position of the short circuit breakdown point of the overvoltage limiting element, and the low short circuit current is cut off in time; the surge protector is prevented from firing and exploding. The surge current and the power frequency short-circuit current pass through the same conductive loop, and the integrated backup protection function is simple in structure, small in size and low in cost.

It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.

Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).

It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.

It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims (9)

1. The utility model provides a surge protector who possesses backup protection function which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

the bearing assembly (100) comprises a shell (101) and a support (300), wherein the shell (101) is sleeved on the support (300);

the protection assembly (200) comprises a first conductive sheet (201), a second conductive sheet (202) and a partition piece (203), wherein the partition piece (203) is connected with the first conductive sheet (201) and the second conductive sheet (202);

the first conducting strip (201) and the second conducting strip (202) are inserted into the support (300).

2. A surge protector with a backup protection function according to claim 1, characterized in that: the support (300) comprises a first base (102) and a second base (103), the second base (103) is embedded in the first base (102), the first base (102) comprises a first baffle (102 a) and side plates (102 b), and the side plates (102 b) are arranged on two sides of the first baffle (102 a);

a buckle (102 c) is arranged on the outer side of the side plate (102 b), an opening (101 a) is formed in one surface of the shell (101), a clamping hole (101 b) is formed in one end, close to the opening (101 a), of the side surface of the shell (101), and the buckle (102 c) is located in the clamping hole (101 b).

3. A surge protector with a backup protection function according to claim 2, characterized in that: the first conducting strip (201) comprises a first pin end (201 a) and a first welding end (201 b), the second conducting strip (202) comprises a second pin end (202 a) and a second welding end (202 b), the isolating piece (203) comprises a disconnecting rod (203 a) and a web plate (203 a-6) thereof, a metal piece (203 b), a voltage limiting body (203 c), an electrode (203 d) and a spring (203 e), a convex surface (203 d-1) is arranged on the electrode (203 d), the metal piece (203 b) is connected with the convex surface (203 d-1), and an insulating layer covers the side of the convex surface (203 d-1); one side of the pressure limiting body (203 c) is connected with the first welding end (201 b), and the electrode (203 d) is connected with the other side of the pressure limiting body (203 c).

4. A surge protector with a backup protection function according to claim 3, characterized in that:

the release rod (203 a) is provided with a first notch (203 a-5), and the metal piece (203 b) is embedded in the first notch (203 a-5).

5. A surge protector with backup protection according to claim 4, wherein: a rotating shaft (102 g) is arranged on the side surface of the first baffle (102 a), a rotating hole (203 a-1) and a connecting hole (203 a-2) are arranged on the disengaging rod (203 a), and the rotating hole (203 a-1) is sleeved on the rotating shaft (102 g);

the electrode (203 d) is also provided with a lug (203 d-2), one end of the spring (203 e) is connected with the connecting hole (203 a-2), and the other end is connected with the lug (203 d-2).

6. A surge protector with backup protection according to claim 5, characterized in that: the separation rod (203 a) is further provided with a division bar (203 a-3) and a spoke plate (203 a-6), a second notch (202 b-1) is formed in the second welding end (202 b), the second welding end (202 b) is arranged on the spoke plate (203 a-6), and the division bar (203 a-3) is abutted to the second notch (202 b-1);

and a folding edge (202 b-2) is arranged on the side edge of the second welding end (202 b).

7. A surge protector with a backup protection function according to any one of claims 4 to 6, characterized in that: the side surface of the metal piece (203 b) is provided with a hot melt alloy layer, and the metal piece (203 b) is welded with the convex surface (203 d-1) and the second welding end (202 b) through the hot melt alloy layer.

8. A surge protector with a backup protection function according to claim 3, characterized in that: the side wall of the shell (101) is provided with an inner groove (101 d), the side wall of the shell (101) is also provided with a lug (101 e), and the distance between the lug (101 e) and the insulating packaging layer is equal to or larger than the thickness of the spoke plate (203 a-6); the power frequency short circuit point of the pressure limiting body (203 c) is arranged at a proper position corresponding to the convex surface (203 d-1).

9. A surge protector with a backup protection function according to claim 8, characterized in that: the overlapped side of the convex sheet (101 e) and the inner groove (101 d) comprises a first transverse surface (101 f), a first inclined surface (101 g) and a first vertical surface (101 h); the second welding end (202 b) is also provided with a second transverse surface (202 b-3), a second inclined surface (202 b-4) and a second vertical surface (202 b-5);

the second transverse surface (202 b-3) is arranged corresponding to the first transverse surface (101 f), the second inclined surface (202 b-4) is arranged corresponding to the first inclined surface (101 g), and the second vertical surface (202 b-5) is arranged corresponding to the first vertical surface (101 h);

the top of the shell (101) is also provided with an observation port (101 c);

the end part of the disengaging rod (203 a) is also provided with an indicating end (203 a-4), and the indicating end (203 a-4) is folded towards the upper end of the pressure limiting body (203 c).

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