CN2323486Y - Distribution frame protector with thermistor failure protection and warning functions - Google Patents

Abstract

The utility model relates to a distribution frame protector with thermistor failure protection and warning functions, comprising a case, a pressure spring, a discharging tube, a capsule metal fusing piece, a thermistor, a wire connecting reed and an audible and visual alarm device composed of an LED. The utility model is characterized in that the other side of the capsule metal fusing piece with the failure protection in the case is tightly clung to the thermistor with positive temperature coefficient. Thus, the heat generate by the thermistor bearing overload for a long time can be transferred to the capsule metal fusing piece. The capsule metal fusing piece can generate plastic deformation for unloading the load. The device has perfect over-current and failure protecting functions of the protector. The utility model is favorable for ensuring equipment and personal safety and the normal operation of a distribution frame.

Description

Distributing frame protector with thermistor fail safe and alarm function

The utility model relates to a kind of corollary equipment of distributing frame, exactly, relates to a kind of distributing frame protector with thermistor fail safe and alarm function.

One side connects exchange line, opposite side connects the main frame of the inside cable wiring of switch entrance and exit, (claims: protector) for the operate as normal that guarantees switch must be provided with Security Unit with preventing the person and equipment from suffering the overvoltage overcurrent injury that is entered by outside line on main frame.The main source of this overvoltage, overcurrent is: 1, in the outside line or near the surge that causes of thunderbolt; When 2, near power line the outside line or electric device and railway electrification system break down, the alternating voltage that in outside line, induces; 3, the direct collision of outside line and 220 volts of power lines or city trolley bus electric wire.

Now; main frame equipment has all adopted the protector that is made of elements such as PTC (Positive temperature cofficient) semistor, gas discharge tube and terne metal hot melt sheets, and this device can be born overcurrent or the protection of superpotential instantaneous operation and overvoltage fail safe and the in time function of alarm for a long time at present.The operation principle of discharge tube fail safe mechanism wherein is: when discharge tube discharges for a long time; the heat energy that discharge tube produces will make the heat fusing generation plastic deformation with its next-door neighbour; again under the elastic force effect; make discharge tube and ground wire short circuit and make outside line a line or the direct ground connection of b line; send the alarm call snap simultaneously and show, realize fail safe.Yet a major defect of existing protector is the function that does not have long-time overcurrent fail safe and alarm.Just, run into overload situations in outside line, deficiency is so that discharge tube when discharging over the ground, then bears overload by the PTC thermistor again, and this moment, the interior resistive of thermistor was big, becomes the high resistive relative open-circuit condition that is.Because thermistor two ends long term overloading, can not produce the inefficacy action protection again and the ground connection earial drainage, the heat energy that makes generation it on is preserved on protector and damage equipment; And because of thermistor is in the overload powering state, be not intended to touching, can cause very big danger personal safety as operating personnel; Moreover because of not producing the audible and visual alarm signal, operating personnel can not in time find fault and get rid of it as early as possible, will make this fault effects distributing frame operate as normal.

The purpose of this utility model provides a kind of distributing frame protector with thermistor fail safe and alarm function that can address the aforementioned drawbacks.

The utility model is achieved in that and includes casing; stage clip; discharge tube; terne metal hot melt sheet; thermistor; wiring reed and the sound and light alarm device of forming by light-emitting diode; parallel longitudinal is installed in proper order and is provided with two row by stage clip in Qian type casing; gas discharge tube; FS terne metal hot melt sheet and the overvoltage unloading protecting mechanism of discharging when being positioned at long that the ground connection earial drainage reed with the stage clip interlock in the middle of the two row elements constitutes; wherein the gas discharge tube next-door neighbour is installed in a side of FS terne metal hot melt sheet; the inboard of casing is installed on the distribution reed; be installed on alarm indication light-emitting diode on the external handle end face of casing; it is characterized in that: the opposite side of the FS terne metal hot melt sheet in casing is close to the thermistor of pressing close to be installed on positive temperature coefficient, makes the heat energy that produces on the thermistor can conduct to terne metal hot melt sheet.

The end face of wherein installing the casing external handle of alarm indication light-emitting diode takes the form of inclined plane.

Wherein the material of the thermistor of positive temperature coefficient can be high molecular, also can be ceramic.

Wherein terne metal hot melt sheet can be one, and the next-door neighbour is installed in the middle of gas discharge tube and the PTC thermistor; Also can be two, the next-door neighbour reclines and is installed in a side of gas discharge tube and PTC thermistor respectively.

Characteristics of the present utility model are by the architecture advances to original main frame protector, gas discharge tube and PTC thermistor are close to respectively recline and are installed in the both sides of fail safe [fail-safe (FS)] terne metal hot melt sheet, when protector runs into long-time overcurrent overload, and discharge tube is can not the ground connection earial drainage time, the thermal energy conduction that the PTC thermistor is overloaded for a long time produce is given terne metal hot melt sheet, make it to produce plastic deformation, again under the effect of stage clip elastic force, make its grounding reed displacement and a line or the b line ground connection that allow outside line; In time connect warning circuit simultaneously and send the audible and visual alarm signal.The utility model can solve the fail safe and the alarm of the long-time overcurrent of main frame in a word, and the further perfect fail safe function of protector helps safeguard work personnel's the personal safety and the normal operation of equipment.In addition, the utility model has also been done adjustment to the installation site of the alarm indicator of protector, makes it to be more prone to discover so that in time fix a breakdown.

Specifically introduce structure of the present utility model below in conjunction with drawings and Examples.

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is a schematic perspective view of the present utility model;

Fig. 3 is an electrical schematic diagram of the present utility model.

Referring to Fig. 1; Fig. 2; the utility model is a kind of distributing frame protector with thermistor fail safe and alarm function; it includes casing 1; stage clip 2; discharge tube 3; terne metal hot melt sheet 4; thermistor 5; wiring reed 6 and the sound and light alarm device of forming by light-emitting diode 8; parallel longitudinal is installed in proper order and is provided with two row by stage clip 2 in Qian type casing 1; gas discharge tube 3; FS terne metal hot melt sheet 4 and the overvoltage unloading protecting mechanism of discharging when being positioned at long that ground connection earial drainage reeds 9 with stage clip 2 interlocks in the middle of the two row elements constitute; wherein gas discharge tube 3 next-door neighbours are installed in a side of FS terne metal hot melt sheet 4; the inboard of casing 1 is installed on distribution reed 6; be installed on alarm indication light-emitting diode 8 on external handle 7 end faces of casing 1; the opposite side of the FS terne metal hot melt sheet 4 in casing 1 is close to the thermistor 5 of pressing close to be installed on positive temperature coefficient, makes the heat energy that produces on the thermistor 5 can conduct to terne metal hot melt sheet.

Introduce operation principle of the present utility model below in conjunction with Fig. 3: when external cable (a, b line) when accident is touched power, illumination or electric car cable, can cause outside line to load the voltage that exchanges 160-220V or direct current 60-500V for the distributing frame protector according to what it touched apart from distance or different situations, because the effect of line resistance, the voltage when reaching device end have not reached required 190 volts-260 volts of discharge voltage.Like this, discharge tube FD-a, the FD-b on the protector also is failure to actuate, and born chance failure voltage for a long time and generated heat by PTC-a, PTC-b thermistor, and its resistance increases; This heat energy reaches terne metal hot melt sheet FS-a, the FS-b that installs by subsides with its next-door neighbour, when temperature reaches a certain numerical value (for example: 70 ℃), this hot melt sheet produces plastic deformation and melts, again under the elastic force effect of stage clip 2, make K switch-a, K-b action, connect ground wire E and earial drainage, alarm signal line S and ground wire E also constitute path simultaneously, its alarm device sends the audible and visual alarm signal, and alarm LED lamp is bright.FD is the R230 gas discharge tube among Fig. 3, and PTC is a positive temperature coefficient thermistor, and FS is 70 ℃ of leypewter hot melt sheets, and K is hot step switch, and LED is Φ 3 high brightness LEDs.

Another improvements of the present utility model are to make the handle end face outside the protector casing into inclined-plane (referring to Fig. 1) by the plane, when the alarm indicator installed on it like this 8 is bright, the staff only need stand in frame one side just can in time find it, fixes a breakdown as early as possible.The material of the PTC thermistor in the utility model can be high molecular, also can be ceramic.Wherein terne metal hot melt sheet can be that a next-door neighbour is installed in the middle of gas discharge tube and the PTC thermistor, also can be two respectively the next-door neighbour recline and be installed in a side of gas discharge tube and PTC thermistor.Wherein the plastic deformation temperatures of hot melt sheet can be selected the product of different temperatures parameter as required.

Claims (4)

1; a kind of distributing frame protector with thermistor fail safe and alarm function; include casing; stage clip; discharge tube; terne metal hot melt sheet; thermistor; wiring reed and the sound and light alarm device of forming by light-emitting diode; parallel longitudinal is installed in proper order and is provided with two row by stage clip in Qian type casing; gas discharge tube; FS terne metal hot melt sheet and the overvoltage unloading protecting mechanism of discharging when being positioned at long that the ground connection earial drainage reed with the stage clip interlock in the middle of the two row elements constitutes; wherein the gas discharge tube next-door neighbour is installed in a side of FS terne metal hot melt sheet; the inboard of casing is installed on the distribution reed; be installed on alarm indication light-emitting diode on the external handle end face of casing; it is characterized in that: the opposite side of the FS terne metal hot melt sheet in casing is close to the thermistor of pressing close to be installed on positive temperature coefficient, makes the heat energy that produces on the thermistor can conduct to terne metal hot melt sheet.

2, distributing frame protector as claimed in claim 1 is characterized in that: the end face of wherein installing the casing external handle of alarm indication light-emitting diode takes the form of inclined plane.

3, distributing frame protector as claimed in claim 1 is characterized in that: wherein the material of the thermistor of positive temperature coefficient can be high molecular, also can be ceramic.

4, distributing frame protector as claimed in claim 1 is characterized in that: wherein terne metal hot melt sheet can be one, and the next-door neighbour is installed in the middle of gas discharge tube and the PTC thermistor; Also can be two, the next-door neighbour reclines and is installed in a side of gas discharge tube and PTC thermistor respectively.

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