The present disclosure relates to the field of low-voltage electrical equipment, and in particular, to a box core module, a plug module, and a surge protective device (SPD).
In a low-voltage distribution system, for overvoltage caused by lightning, an SPD is more commonly used by technicians in the industry to provide protection. As a core component of the SPD, a varistor is generally limited by the processing capacity of the varistor and the outline dimension of the SPD. When a working voltage of a protection system exceeds the working voltage of the varistor, a plurality of (≥2) varistors of the same type are usually used in series to ensure the normal use of the SPD at a high working voltage. When an impulse current of the protection system is greater than a through-current limit of the varistor, a plurality of (≥2) varistors of the same type are used in parallel to ensure that the SPD can withstand a large enough impulse current.
The prior SPD is generally designed separately based on a series connection state and a parallel connection state of varistors used; in other words, the manner of connecting the varistors in series or parallel directly affects the tripping mechanism of the SPD and even the structure of the whole SPD. This inevitably leads to low repeatability, low universality, a long development cycle, and a high cost of parts, which is contrary to diversified market demand.
Given the above shortcomings in the prior art, the present disclosure is intended to provide a modularized multi-form assembly-type SPD. Through different combinations of series connections and parallel connections of all box core modules, mutual conversion between a high working voltage of the SPD and a large lightning strike through-current can be achieved when the same voltage-limiting element is used and an overall tripping mode remains unchanged.
To achieve the above objectives, the present disclosure provides a box core module, including a box core frame, a voltage-limiting element, a spring electrode, and a tripping mechanism. The voltage-limiting element and the spring electrode are respectively arranged on the front and back sides of the box core frame. The voltage-limiting element includes a pin electrode and a tripping electrode. The tripping electrode of the voltage-limiting element and one end of the spring electrode are welded using a fusible alloy. The tripping mechanism acts on the spring electrode. The tripping mechanism always separates the tripping electrode from the spring electrode when the fusible alloy is melted. The pin electrode of the voltage-limiting element is led out from a side surface of the box core frame to form a first module electrode of the box core module, and an electrode of the tripping mechanism is fixedly led out from the bottom surface of the box core frame to form a second module electrode of the box core module.
Further, the voltage-limiting element is a varistor or a transient suppression diode.
Further, the tripping mechanism includes the box core frame, a spring, and a slider. When the fusible alloy is melted, the spring pushes the slider to slide within the box core frame to always separate the tripping electrode from the spring electrode.
Further, an indication device is disposed on the box core module. A side of the box core frame on which the tripping mechanism is disposed is provided with a positioning column. The indication device is disposed on the positioning column, and the indication device rotates by a certain angle around an axis of the positioning column under a sliding effect of the slider.
Further, two side surfaces of the box core frame are provided with a snap device for positioning the pin electrode.
To achieve the above objectives, the present disclosure further provides a plug module, including a housing, a bottom plate, and a plurality of box core modules with an independent tripping mechanism. The plurality of box core modules are vertically arranged on the bottom plate in the same direction and side-by-side manner. The plurality of box core modules are connected by an internal connection electrode to form a parallel combined line, or the plurality of box core modules are vertically arranged on the bottom plate in an opposite direction and side-by-side manner, and every two adjacent box core modules are connected by an internal connection electrode to form a series combined line. The combined line is led out through a first pin electrode and a second pin electrode, and the box core module is the box core module described in any one of the above technical solutions.
Further, there are two box core modules; the two box core modules are vertically arranged on the bottom plate in the opposite direction and side-by-side manner. The connection electrode includes a series electrode arranged on the bottom surface of the bottom plate. The second module electrodes of the two box core modules are fixedly and conductively connected at the bottom side through the series electrode. The first pin electrode and the second pin electrode are led out from two sides of the bottom plate, respectively. The first module electrodes of the two box core modules are fixedly and conductively connected to the two pin electrodes, respectively, such that the two box core modules form the series combined line.
Further, the series electrode is a planarly-structured electrode.
Further, the plurality of box core modules are vertically arranged on the bottom plate in the same direction and side-by-side manner. The connection electrode includes a parallel electrode, second module electrodes of the plurality of box core modules are fixedly and conductively connected through the parallel electrode, and the parallel electrode is connected to the first pin electrode of the box core module. The first module electrodes of the plurality of box core modules are fixedly and conductively connected to the second pin electrode of the box core module, such that the plurality of box core modules form the parallel combined line.
Further, the parallel electrode is an electrode with an L-shaped structure. A vertically arranged end of the electrode with the L-shaped structure is fixedly and conductively connected to the first pin electrode of the box core module. A horizontally arranged end of the electrode with the L-shaped structure is separated to form two electrodes. The two electrodes are fixedly and conductively connected to the first module electrodes of the box core modules, respectively.
Further, the first pin electrode and the second pin electrode are plate-shaped electrodes of the same structure, and each includes a welding portion, a clamping portion, and a plugging portion. The plugging portion is led out from the bottom plate and is a lead-out pin of the plug module. The clamping portion is provided with a slot and/or a hole for clamping the box core module and the bottom plate. The welding portion is separated into welding electrodes having the same quantity as the box core modules, and the spacing between the centers of adjacent welding electrodes is the spacing between the centers of adjacent box core modules, such that the welding electrodes are fixedly and conductively connected to the first module electrodes of the box core modules.
To achieve the above objectives, the present disclosure provides an SPD, including a plug module and a base. The plug module is the plug module described in any one of the above technical solutions, and the base has a plug slot for accommodating the first pin electrode and the second pin electrode.
The present disclosure provides a modularized multi-form assembly-type SPD. Through different combinations of series connections and parallel connections of all box core modules, mutual conversion between a high working voltage of the SPD and a large lightning strike through-current can be achieved when the same voltage-limiting element is used and an overall tripping mode remains unchanged.
The above description is merely a summary of the technical solutions of the present disclosure. To make the technical means of the present disclosure more clear so it can be implemented in accordance with the content of the specification, and to make the above and other objectives, features, and advantages of the present disclosure more obvious and comprehensible, specific implementations of the present disclosure are described below.
To describe the technical solutions in the embodiments of the present disclosure or the prior art more clearly, the following briefly describes the drawings of the embodiments or the prior art. Apparently, the drawings in the following description merely show some embodiments of the present disclosure, and those of ordinary skill in the art may still derive other drawings from these drawings without creative efforts.
To further illustrate the embodiments, the present disclosure provides accompanying drawings. The accompanying drawings, as a part of the present disclosure, are mainly used to illustrate the embodiments and can explain the operating principles of the embodiments with reference to the related descriptions in this specification. With reference to such content, those of ordinary skill in the art can derive other possible implementations and advantages of the present disclosure. Components in the drawings are not drawn to scale, and similar reference numerals are usually used to represent similar components.
The present disclosure will be further described below with reference to the accompanying drawing and specific implementations.
As shown in
In this embodiment, the varistor 12 is a voltage-limiting element. In practical application, based on an application need, the voltage-limiting element may alternatively be a transient voltage suppression diode to replace the varistor 12.
The varistor 12 and the spring electrode 13 are respectively arranged on the front and back sides of the box core frame 11. The slider 14 and the spring 15 form a tripping mechanism and are arranged on the same side of the box core frame 11 as the spring electrode 13.
The varistor 12 is provided with tripping electrode 122 and pin electrode 121, where the pin electrode 121 is fixed on a side of the box core frame 11 to form first module electrode 16 of the box core module. The spring electrode 13 includes welding portion 131, elastic connection portion 132, and lead-out portion 133. The tripping electrode 122 and the welding portion 131 of the spring electrode 13 are welded using a fusible alloy, and the lead-out portion 133 is fixedly installed at a bottom of the box core frame 11 to form second module electrode 17 of the box core module 1. The elastic connection portion 132 of the spring electrode 13 limits the slider 14 and the spring 15 to a side of the box core frame 11, and the spring 15 is in an energy storage state to form the tripping mechanism. When the fusible alloy is melted, the slider 14 slides under the effect of the spring 15, and the tripping mechanism always separates the tripping electrode 122 from the welding portion 131 of the spring electrode 13.
In this embodiment, when the fusible alloy is melted, the spring 15 pushes the slider 14 to slide within the box core frame 11 to always separate the tripping electrode 122 from the spring electrode 13.
In this embodiment, an indication device is disposed on the box core module 1, a side of the box core frame 11 on which the tripping mechanism is disposed is provided with positioning column 111. The indication device is disposed on the positioning column, and the indication device rotates by a certain angle around an axis of the positioning column under the sliding effect of the slider. For details, reference is made to the following description of a plug module.
In this embodiment, two sides of the box core frame 11 are provided with snap device 113 for positioning the pin electrode. For details, reference is made to Embodiment 2 and Embodiment 3.
As shown in
As shown in
The two box core modules 1a and 1b correspond to MOD1 and MOD2 in
In the present disclosure, the fixed and conductive connection may be achieved by welding or crimping, such that the two metal electrodes are fixed and fit to form the fixed and conductive connection.
In this embodiment, an indication device is integrated. The indication device 6a is arranged on the box core module 1a, and the indication device 6a includes indicator 61a and tripping touch portion 62a. When any one of the box core modules 1a and 1b is tripped, a slider moves upward and touches the tripping touch portion 62a and pushes the indication device 6a to rotate by a certain angle to place the indicator 61a under indication windows 21a and 21b of housing 2. The indicator 61a is provided with a color different from that of the box core frame 11 to give a tripping indication.
In Embodiment 1 and Embodiment 2, the series bottom plate 4a and parallel bottom plate 4b may be bottom plates of the same structure, or may be bottom plates of different structures as shown in the specific embodiment to provide a better assembly fit.
In this embodiment, the pin electrode 3a and the pin electrode 3b are electrodes of the same structure, and each includes welding portion 31, clamping portion 32, and plugging portion 33. The clamping portion 32 is provided with a slot and a hole for clamping snap device 113 of the box core module and snap device 41 on a sidewall of the bottom plate (including the series bottom plate 4a and the parallel bottom plate 4b) to connect the box core module 1a, the box core module 1b, the bottom plate, the pin electrode 3a, and the pin electrode 3b to form a whole. The welding portion 31 is separated into two welding electrodes, and the spacing between the centers of the welding electrodes is consistent with that between centers of the box core modules 1a and 1b. The welding portion 31 is welded with the first module electrode of the box core module 1 to realize a fixed and conductive connection. The plugging portion 33 is a lead-out pin of the plug module.
As shown in
The core modules 1a and 1b correspond to MOD1 and MOD2 in
The parallel electrode 5b is an electrode with an L-shaped structure, and vertically arranged end 51 of the electrode with the L-shaped structure is fixedly and conductively connected to the pin electrode 3a, a horizontally arranged end of the electrode with the L-shaped structure is separated to form electrodes 52 and 53, and the electrodes 52 and 53 are fixedly and conductively connected to the first module electrodes 16a and 16b of the box core modules 1a and 1b, respectively.
In this embodiment, the pin electrode 3a and the pin electrode 3b are electrodes of the same structure and are the same as the pin electrode in Embodiment 2.
For a plug module with a parallel line formed by a plurality of box core modules (there are more than two box core modules), welding portion 31 is separated into a plurality of welding electrodes, and the spacing between centers of adjacent welding electrodes is the spacing between centers of adjacent box core modules to weld each welding electrode and a first module electrode of box core module 1 to realize a fixed and conductive connection.
In this embodiment, a different indication device is disposed on each box core module. Two indication devices 6b are respectively arranged on the box core modules 1a and 1b, and the indication device 6b includes indicator 61b and tripping touch portion 62b. When any one of the box core modules 1a and 1b is tripped, a slider moves upward and touches the tripping touch portion 62b of the corresponding indication device 6b and pushes the indication device 6b to rotate by a certain angle to place the indicator 61b under indication window 21a or 21b of housing 2. The indicator 61b is provided with a color different from that of box core frame 11 to give a tripping indication.
Those skilled in the art can dispose a plurality of box core modules 1 side by side in accordance with an internal connection mode shown in Embodiment 2 and with reference to
As shown in
The phrases “one embodiment”, “embodiment” or “one or more embodiments” mentioned herein mean that a specific feature, structure, or characteristic described in combination with the embodiment is included in at least one embodiment of the present disclosure. In addition, it should be noted that the phrase “in an embodiment” herein does not necessarily refer to the same embodiment.
In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present disclosure can be practiced without these specific details. In some embodiments, well-known methods, structures, and techniques are not shown in detail to avoid obscuring the understanding of this specification.
In the claims, any reference sign between brackets should not be constructed as a limitation on the claims. The word “contain” does not exclude the presence of elements or steps not listed in the claims. The word “one” or “a/an” preceding an element does not exclude the existence of a plurality of such elements. The present disclosure can be implemented with the assistance of hardware including several different components and the assistance of a properly programmed computer. In the unit claims where several apparatuses are listed, several of the apparatuses may be embodied by the same hardware item. The use of words such as first, second, and third does not indicate any order. The words may be interpreted as names.
Finally, it should be noted that the foregoing embodiments are used only to explain the technical solutions of the present disclosure but are not intended to limit the present disclosure. Although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions on some technical features therein. The modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.
Number | Date | Country | Kind |
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202021734877.0 | Aug 2020 | CN | national |
This application is the national phase entry of International Application No. PCT/CN2021/096106, filed on May 26, 2021, which is based upon and claims priority to Chinese Patent Application No. 202021734877.0, filed on Aug. 19, 2020, the entire contents of which are incorporated herein by reference.
Filing Document | Filing Date | Country | Kind |
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PCT/CN2021/096106 | 5/26/2021 | WO |