A surge protector with backup protection function

Abstract

The invention discloses a surge protector with a backup protection function, comprising a bearing component, comprising a shell and a support, wherein the shell is sleeved on the support; a protection component, comprising a first conductive sheet, a second conductive sheet and a partition, wherein the partition connects the first conductive sheet and the second conductive sheet; the first conductive sheet and the second conductive sheet are both inserted into the support; a thermal disconnection device of the surge protector can disconnect the maximum expected short-circuit current when the surge protector fails to short-circuit and prevent the surge protector from catching fire when disconnecting a low short-circuit current.

Description

Technical Field

[0001] The present invention relates to the technical field of surge protectors, in particular to a surge protector with a backup protection function. Background Art

[0002] Generally, there is no backup protection function, or the backup protection is integrated with the surge protector, and the maximum expected short-circuit current is disconnected by an integrated circuit breaker or fuse; in order to achieve full-range protection and no false operation, the surge current and the power frequency short-circuit current pass through different conductive circuits respectively; for example, the backup protection circuit breaker of a surge protector disclosed in patent number CN201720036416.8 has a complex structure, large size and high cost. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the title of the invention of this application to avoid blurring the purpose of this section, the abstract of the specification and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the above problems and / or the problems existing in the prior art, the present invention is proposed.

[0005] Therefore, the technical problem to be solved by the present invention is that the existing equipment has no backup protection function, or has a large structure and poor functionality.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A surge protector with backup protection function, comprising: a bearing assembly, comprising a shell and a support, wherein the shell is sleeved on the support;

[0007] A protection assembly, comprising a first conductive sheet, a second conductive sheet and a partition, wherein the partition connects the first conductive sheet and the second conductive sheet;

[0008] The first conductive sheet and the second conductive sheet are both inserted into the support.

[0009] As a preferred solution of the surge protector with backup protection function of the present invention, wherein: the support includes a first base and a second base, the second base is embedded in the first base, the first base includes a first baffle and a side plate, and the side plate is arranged on both sides of the first baffle;

[0010] A buckle is arranged on the outer side of the side plate, an opening is arranged on one side of the shell, a clamping hole is arranged on the side of the shell near one end of the opening, and the buckle is located in the clamping hole.

[0011] As a preferred solution of the surge protector with backup protection function described in the present invention, the first conductive sheet includes a first pin end and a first welding end, the first pin end is provided with a first through hole, the second conductive sheet includes a second pin end and a second welding end, the second pin end is provided with a second through hole.

[0012] As a preferred solution of the surge protector with backup protection function described in the present invention, the partition member includes a release rod, a metal member, a pressure limiting body, an electrode and a spring, one side of the pressure limiting body is connected to the first welding end, and the electrode is connected to the other side of the pressure limiting body.

[0013] As a preferred solution of the surge protector with backup protection function of the present invention, wherein: a convex surface is provided on the electrode, the metal piece is provided and connected to the convex surface, and the convex surface side is covered with an insulating encapsulation layer;

[0014] The disengagement rod is provided with a first notch, and the metal piece is embedded in the first notch.

[0015] As a preferred solution of the surge protector with backup protection function described in the present invention, wherein: a rotating shaft is arranged on the side of the first baffle, a rotating hole and a connecting hole are arranged on the disengagement rod, and the rotating hole is sleeved on the rotating shaft;

[0016] The electrode is also provided with a lug, and one end of the spring is connected to the connection hole, and the other end is connected to the lug.

[0017] As a preferred solution of the surge protector with backup protection function of the present invention, wherein: the disengagement rod is further provided with a partition bar and a spoke plate, the second welding end is provided with a second notch, the second welding end is provided on the spoke plate, and the partition bar abuts against the second notch;

[0018] The side edge of the second welding end is provided with a folded edge.

[0019] As a preferred solution of the surge protector with backup protection function described in the present invention, a hot-melt alloy layer is provided on the side of the metal member, and the metal member is welded to the raised surface and the second welding end through the hot-melt alloy layer.

[0020] As a preferred solution of the surge protector with backup protection function described in the present invention, the shell side wall is provided with an inner groove, the shell side wall is also provided with a protrusion, the distance between the protrusion and the insulating encapsulation layer is equal to or greater than the thickness of the spoke plate; the power frequency short-circuit point of the voltage limiting body is set at a suitable position for the protrusion surface.

[0021] As a preferred solution of the surge protector with backup protection function of the present invention, wherein: the overlapping edge of the protrusion and the inner groove includes 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;

[0022] The second horizontal surface is arranged corresponding to the first horizontal 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;

[0023] The top of the shell is also provided with an observation port;

[0024] The end of the disengagement rod is also provided with an indicating end, and the indicating end is folded toward the upper end of the pressure limiting body.

[0025] The beneficial effects of the present invention are as follows: the thermal disconnection device of the surge protector can disconnect the maximum expected short-circuit current when the surge protector fails in a short circuit and prevent the surge protector from catching fire when disconnecting a low short-circuit current. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0027] Figure 1 A schematic diagram of the overall structure of a surge protector with backup protection function according to an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the overall explosion structure of a surge protector with backup protection function according to an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of an exploded structure of a load-bearing component in a surge protector with a backup protection function according to an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the butt joint structure between the protruding piece and the second welding end in a surge protector with backup protection function according to an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of the placement structure of a first conductive sheet and a second conductive sheet in a first base in a surge protector with a backup protection function according to an embodiment of the present invention;

[0032] Figure 6A schematic diagram of the connection structure of a protection component in a surge protector with backup protection function according to an embodiment of the present invention;

[0033] Figure 7 A schematic diagram of a connection structure of a surge protector with backup protection function without removing the second conductive sheet protection component according to an embodiment of the present invention;

[0034] Figure 8 A schematic cross-sectional view of a connection structure of a partition member in a surge protector with a backup protection function according to an embodiment of the present invention;

[0035] Fig. 9 A schematic diagram of the side structure of a shell in a surge protector with backup protection function according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0038] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0039] Furthermore, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] Example 1

[0041] Reference Figures 1 to 9 , This embodiment provides a surge protector with backup protection function, including, a bearing assembly 100, including a housing 101 and a support 300, the housing 101 is sleeved on the support 300;

[0042] The protection assembly 200 includes a first conductive sheet 201, a second conductive sheet 202 and a partition 203, wherein the partition 203 connects the first conductive sheet 201 and the second conductive sheet 202;

[0043] The first conductive sheet 201 and the second conductive sheet 202 are both inserted into the support 300 .

[0044] The support 300 includes a first base 102 and a second base 103, the second base 103 is embedded in the first base 102, the first base 102 includes a first baffle 102a and a side plate 102b, and the side plate 102b is arranged on both sides of the first baffle 102a;

[0045] A buckle 102c is disposed on the outer side of the side plate 102b, an opening 101a is disposed on one side of the housing 101, and a locking hole 101b is disposed on one end of the side of the housing 101 close to the opening 101a, and the buckle 102c is located in the locking hole 101b.

[0046] The first conductive sheet 201 includes a first pin end 201a and a first welding end 201b, the first pin end 201a is provided with a first through hole 201c, and the second conductive sheet 202 includes a second pin end 202a and a second welding end 202b, the second pin end 202a is provided with a second through hole 202c.

[0047] The partition member 203 includes a release rod 203a, a metal member 203b, a pressure limiting body 203c, an electrode 203d and a spring 203e. One side of the pressure limiting body 203c is connected to the first welding end 201b, and the electrode 203d is connected to the other side of the pressure limiting body 203c.

[0048] The electrode 203d is provided with a raised surface 203d-1, the metal member 203b is provided and connected to the raised surface 203d-1, and the raised surface 203d-1 is covered with an insulating encapsulation layer;

[0049] The disengagement rod 203a is provided with a first notch 203a-5, and the metal piece 203b is embedded in the first notch 203a-5.

[0050] A rotating shaft 102g is disposed on the side of the first baffle 102a, and a rotating hole 203a-1 and a connecting hole 203a-2 are disposed on the disengagement rod 203a, and the rotating hole 203a-1 is sleeved on the rotating shaft 102g;

[0051] The electrode 203d is also provided with a lug 203d-2, and one end of the spring 203d-2 is connected to the connection hole 203a-2, and the other end is connected to the lug 203d-2.

[0052] The separation rod 203a is also provided with a spacer bar 203a-3 and a spoke plate 203a-6, and the second welding end 202b is provided with a second notch 202b-1, and the second welding end 202b is provided on the spoke plate 203a-6, and the spacer bar 203a-3 abuts against the second notch 202b-1;

[0053] A folded edge 202b-2 is provided on the side of the second welding end 202b.

[0054] The folded edge 202b-2 is used to increase the overall strength of the second welding end 202b.

[0055] A hot-melt alloy layer is provided on the side of the metal piece 203b, and the metal piece 203b is welded to the raised surface 203d-1 and the second welding end 202b through the hot-melt alloy layer.

[0056] The side wall of the shell 101 is provided with an inner groove 101d, and the side wall of the shell 101 is also provided with a protrusion 101e. The distance between the protrusion 101e and the insulating encapsulation layer is equal to or greater than the thickness of the spoke 203a-6; the power frequency short-circuit point of the voltage limiting body 203c is set at a position facing the raised surface 203d-1.

[0057] The overlapping edges of the protruding piece 101e and the inner groove 101d include a first transverse surface 101f, a first inclined surface 101g and a first vertical surface 101h; 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 202b-5;

[0058] The second horizontal surface 202b-3 is arranged corresponding to the first horizontal 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 101h;

[0059] The top of the housing 101 is also provided with an observation port 101c;

[0060] The end of the disengagement rod 203a is also provided with an indicating end 203a-4, and the indicating end 203a-4 is bent toward the upper end of the pressure limiting body 203c.

[0061] A plugging column 103a is disposed on the side of the second base 103, and a plugging hole 102d is disposed on the side of the first baffle 102a. The plugging column 103a and the plugging hole 102d are disposed opposite to each other and have corresponding positions.

[0062] The first baffle 102a is provided with a first slot 102e and a second slot 102f, the first pin end 201a is provided in the first slot 102e, and the second pin end 202a is provided in the second slot 102f;

[0063] The plug-in column 103a includes a first plug-in shaft 103a-1 and a second plug-in shaft 103a-2, and the plug-in hole 102d includes a first plug-in hole 102d-1 and a second plug-in hole 102d-2. The first plug-in shaft 103a-1 passes through the first through hole 201c and is inserted into the first plug-in hole 102d-1, and the second plug-in shaft 103a-2 passes through the second through hole 202c and is inserted into the second plug-in shaft 103a-2.

[0064] In this embodiment, one or two overvoltage limiting elements connected in parallel and located in a structural unit are arranged in the housing 101 of the device; the device as a whole is connected to the power supply system through the first conductive sheet 201 and the second conductive sheet 202; specifically, the overvoltage limiting element is a combined structure of an electrode 203d, a voltage limiting body 203c, and a first conductive sheet 201; the voltage limiting body 203c can be a varistor, which exhibits low resistance characteristics under high voltage and can conduct current; the thermal disengagement device includes a disengagement rod 203a, a metal part 203b and a spring 203e, and when the overvoltage limiting element is short-circuited, the surge protector is disconnected from the power supply system, and has an indication part for displaying the working and fault status of the overvoltage protector, namely the observation port 101c and the indication terminal 203a-4.

[0065] The electrode 203d of the overvoltage limiting element is provided with a raised surface 203d-1, which is very close to or coplanar with the insulating encapsulation surface on the electrode 203d. The welding end of the second conductive sheet 202 is welded to the raised surface 203d-1 of the overvoltage limiting element through a metal piece 203b and a hot-melt alloy, and the metal piece 203b is embedded in the release rod 203a made of a gas-generating insulating material.

[0066] When the hot melt alloys on the inner and outer surfaces of the metal part 203b are melted synchronously, the disengagement rod 203a rotates under the action of the tension spring force to make the metal part 203b leave the initial position, which is the position corresponding to the welding of the metal part 203b and the convex surface 203d-1, and inserts between the welding end and the convex surface 203d-1 of the electrode 203d, stretches and cuts off the arc generated between the second conductive sheet 202 and the overvoltage limiting element, and realizes the barrier breaking. The gap between the disengagement rod 203a and the encapsulated surface of the electrode 203d and the gap between the disengagement rod 203a and the inner wall of the shell 101 are very small, that is, the distance from the outer side surface of the partition bar 203a-3 to the outer side surface of the convex sheet 101e is very small. When the disengagement rod 203a rotates, the arc is quickly stretched and forced to enter the above two very small insulation gaps. The arc is cooled by the double-sided cooling of the insulating material and the air blowing cooling of the gas-generating material, and the voltage gradient is very high, so that the narrow gap arc is extinguished.

[0067] When the maximum expected short-circuit current passes through the failed surge protector, the thermal capacity of the overvoltage limiting element is much greater than that of the second conductive sheet 202, resulting in the instantaneous temperature rise of the electrode 203d welded on the overvoltage limiting element being much lower than that of the second conductive sheet 202. The thermal resistance of the electrode 203d, the metal part 203b, and the second conductive sheet 202 in the overvoltage limiting element must be matched so that the hot melt alloys on the inner and outer surfaces of the metal part 203b can be melted synchronously to achieve barrier disconnection.

[0068] The specific implementation method is: increase the thermal resistance from the overvoltage limiting element electrode 203d to its raised surface 203d-1 (increase the height of the raised surface 203d-1 of the electrode 203d, or reduce the cross-sectional area of ​​the connection between the raised surface 203d-1 and other parts of the electrode 203d, and the electrode 203d uses a material with low thermal conductivity or electrical conductivity); increase the thermal resistance from the raised surface 203d-1 to the metal part 203b (increase the area of ​​the raised surface 203d-1 of the electrode 203d or reduce the cross-sectional area of ​​the raised surface 203d-1); increase the interface thermal resistance between the metal part 203b and the raised surface 203d-1 of the electrode 203d; reduce the thermal resistance of the second conductive sheet 202 (reduce the length of the second conductive sheet 202, appropriately increase the cross-sectional area, and use the second conductive sheet 202 A material with high thermal conductivity or electrical conductivity), and reduce the interface thermal resistance between the metal part 203b and the second conductive sheet 202.

[0069] When a low short-circuit current passes through a surge protector, the temperature rise rate of the short-circuit breakdown point of the overvoltage limiting element is much faster than that of the disconnection position of the thermal detachment device. The device cannot operate in time, which is an important reason for the surge protector to catch fire. Therefore, it is necessary to control the temperature difference between the short-circuit breakdown point and the disconnection position of the device. The specific implementation method is: the hot melt disconnection position of the device is set at the raised 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 of the raised surface 203d-1 of the electrode 203d, and the preferred position is set opposite to the raised surface 203d-1. Doing so can also avoid structural damage caused by the short-circuit breakdown of the overvoltage limiting element, resulting in the thermal detachment device not being able to operate normally (for example, the spring 203e is burned out, and foreign matter is stuck in the rotation path of the detachment rod 203a).

[0070] The disengagement lever 203a moves from the initial position to the disconnected position, and its indicating portion, namely the indicating end 203a-4, appears at the observation port 101c, indicating that the device is in a fault state.

[0071] The barrier breaking and narrow-slit arc extinguishing technology are adopted to enable the thermal disconnection device of the surge protector to disconnect the maximum expected short-circuit current when the surge protector fails in a short circuit; the thermal resistance of the thermal disconnection device is matched to achieve barrier breaking; the hot melt disconnection position of the thermal disconnection device is set at a suitable position of the short-circuit breakdown point of the overvoltage limiting element to cut off the low short-circuit current in time; and prevent the surge protector from catching fire or exploding. The surge current and the power frequency short-circuit current pass through the same conductive circuit, which integrates the backup protection function while having a simple structure, small size and low cost.

[0072] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0073] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0074] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0075] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. 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 may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A surge protector with backup protection function, characterized in that: include, The bearing assembly (100) comprises a shell (101) and a support (300), wherein the shell (101) is sleeved on the support (300); A protection component (200) comprises a first conductive sheet (201), a second conductive sheet (202) and a partition member (203), wherein the partition member (203) connects the first conductive sheet (201) and the second conductive sheet (202); The first conductive sheet (201) and the second conductive sheet (202) are both inserted into the support (300); The first conductive sheet (201) comprises a first pin end (201a) and a first welding end (201b); the second conductive sheet (202) comprises a second pin end (202a) and a second welding end (202b); the partition member (203) comprises a disengagement rod (203a) and a spoke plate (203a-6) thereof, a metal member (203b), a pressure limiting body (203c), an electrode (203d) and a spring (203e); a convex surface (203d-1) is provided on the electrode (203d); the metal member (203b) is connected to the convex surface (203d-1), and a side of the convex surface (203d-1) is covered with an insulating encapsulation layer; one side of the pressure limiting body (203c) is connected to the first welding end (201b), and the electrode (203d) is connected to the other side of the pressure limiting body (203c); The disengagement rod (203a) is provided with a first notch (203a-5), and the metal piece (203b) is embedded in the first notch (203a-5); The separation rod (203a) is also provided with a spacer (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); the spacer (203a-3) abuts against the second notch (202b-1); The side edge of the second welding end (202b) is provided with a folded edge (202b-2); A hot-melt alloy layer is provided on the side of the metal piece (203b), and the metal piece (203b) is welded to the raised surface (203d-1) and the second welding end (202b) via the hot-melt alloy layer; The side wall of the shell (101) is provided with an inner groove (101d), and the side wall of the shell (101) is also provided with a convex piece (101e), and the distance between the convex piece (101e) and the insulating encapsulation layer is equal to or greater than the thickness of the spoke plate (203a-6); the power frequency short-circuit point of the voltage limiting body (203c) is set at a suitable position relative to the convex surface (203d-1).

2. The surge protector with backup protection function according to claim 1, characterized in that: The support (300) comprises a first base (102) and a second base (103), wherein the second base (103) is embedded in the first base (102), and the first base (102) comprises a first baffle (102a) and a side plate (102b), wherein the side plate (102b) is arranged on both sides of the first baffle (102a); A buckle (102c) is arranged on the outside of the side plate (102b), an opening (101a) is arranged on one side of the shell (101), a locking hole (101b) is arranged on one end of the side surface of the shell (101) close to the opening (101a), and the buckle (102c) is located in the locking hole (101b).

3. The surge protector with backup protection function according to claim 2, characterized in that: A rotating shaft (102g) is disposed on the side of the first baffle (102a), a rotating hole (203a-1) and a connecting hole (203a-2) are disposed on the disengagement rod (203a), and the rotating hole (203a-1) is sleeved on the rotating shaft (102g); The electrode (203d) is also provided with a lug (203d-2), and one end of the spring (203e) is connected to the connection hole (203a-2), and the other end is connected to the lug (203d-2).

4. The surge protector with backup protection function according to claim 3, characterized in that: The overlapping edges of the protruding piece (101e) and the inner groove (101d) include a first transverse surface (101f), a first inclined surface (101g) and a first vertical surface (101h); 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 (202b-5); The second horizontal surface (202b-3) is arranged corresponding to the first horizontal 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 (101h); The top of the housing (101) is also provided with an observation port (101c); The end of the disengagement rod (203a) is also provided with an indicating end (203a-4), and the indicating end (203a-4) is folded toward the upper end of the pressure limiting body (203c).

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