CN2583852Y

CN2583852Y - Automatic protective earth leakage switch for fire

Info

Publication number: CN2583852Y
Application number: CN 02281813
Authority: CN
Inventors: 罗三根
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-10-17
Filing date: 2002-10-17
Publication date: 2003-10-29
Anticipated expiration: 2012-10-17

Abstract

The utility model relates to an automatic protective earth leakage switch for fires. Due to the adoption of a structure which is provided with a voltage divider which is composed of a resistor and a thermosensitive resistor, when a fire occurs to result in that an ambient temperature increases, the thermosensitive resistor can sense the increasing of the ambient temperature, and the resistance value of the thermosensitive resistor increases to make the dividing ratio of the voltage divider change. Through a zener diode, a detecting and controlling integrated circuit, the automatic protective earth leakage switch for fires triggers the control end of the controllable silicon of a control element to be switched on, a tripping coil of an earth leakage tripping device is switched on and attracted to drive a tripping mechanism of an earth leakage switch (switch), and a main moveable contact head of the switch is separated from a main static contact head, so the automatic protective earth leakage switch for fires realizes the goal of breaking a controlled power circuit automatically. The utility model not only has functions of earth leakage detection, etc., but also is an automatic protective earth leakage switch for fires which can also be used for detecting when the ambient temperature increases because of some reasons. The utility model has the advantage of high safety, so can be used by a user without any concern.

Description

Fire automatic protection type leakage switch

1, technical field:

The utility model is a kind of switch, and particularly a kind of fire automatic protection type leakage switch belongs to the renovation technique of switch.

2, background technology:

Existing leakage switch has only functions such as detection of electrical leakage mostly, and when on-the-spot breaking out of fire causes ambient temperature to raise, can not detect, therefore, it can not make the reaction of cutting off the electricity supply when ambient temperature raises, and according to the requirement of fire-fighting to general electricity consumption place and conventional equipment, in case breaking out of fire, at first must cut off the power supply of scene of fire rapidly, to prevent that fire from further enlarging, existing common leakage switch but can not satisfy this fire-fighting requirement, carry out breaking operation and must split to the scene to close with manpower, might realize this requirement in incipient fire and scene, fire adjacent area, and, often not realize this requirement at the scene of real breaking out of fire, promptly enable to realize, also must pay bigger cost.

3, summary of the invention:

The purpose of this utility model is to overcome above-mentioned shortcoming and a kind of detection of electrical leakage that not only has is provided, and the fire automatic protection type leakage switch that also can detect when ambient temperature raises because of certain reason.The utility model is when externally ambient temperature surpasses certain certain value, can make a response voluntarily, automatically cut off the power supply of its control circuit, thereby reach when breaking out of fire, can sense ambient temperature raise, the power supply to the scene of fire carries out breaking operation automatically, and needn't go to execute-in-place with the manpower parent, its fail safe is good, and the user can relievedly use.

Structural representation of the present utility model includes power circuit (1), current detection circuit (2) as shown in Figure 1, and wherein current detection circuit (2) is connected with power circuit (1), and current detection circuit (2) also is connected with overtemperature prote circuit (3).

Above-mentioned power circuit (1) includes transformer B, ZCT, the rc filter circuit of forming by resistance R 1, capacitor C 1, the bridge rectifier and the fuse Ru that form by diode D1～D4, current detection circuit (2) includes and detects control integrated circuit U1, voltage stabilizing didoe ZD1, controllable silicon SCR and peripheral cell resistance R 2～R4 thereof, capacitor C 2～C10, overtemperature prote circuit (3) includes the voltage divider of being made up of resistance R 6, thermistor Rt; Wherein the rc filter circuit of being made up of resistance R 1, capacitor C 1 is connected on the secondary coil of transformer ZCT, the input of the bridge rectifier of being made up of diode D1～D4 is connected on the secondary coil of transformer B, and fuse Ru is connected two inputs of bridge rectifier; The two ends of controllable silicon SCR, by resistance R 6, the voltage divider that thermistor Rt forms is connected with the output of bridge rectifier respectively, the negative electrode of voltage stabilizing didoe ZD1 is connected with the output of bridge rectifier by capacitor C 9, the end of capacitor C 2～C7 is connected with an output of bridge rectifier respectively, the other end of capacitor C 2～C7 is connected with the pin that detects control integrated circuit U1 respectively, the control end of controllable silicon SCR is connected with the pin 7 that detects control integrated circuit U1, another output of bridge rectifier is connected with the pin 8 of U1 by connecting resistance R 3, and the mid point of voltage divider is connected with the breech lock input pin 5 that detects control integrated circuit U1 by voltage stabilizing didoe ZD1.

The utility model is provided with by resistance owing to adopting, thermistor is formed the structure of voltage divider, therefore when on-the-spot breaking out of fire causes ambient temperature to raise, thermistor can sense the rising of ambient temperature, this thermistor resistance increases, voltage divider dividing potential drop ratio is changed, again by voltage stabilizing didoe and detection control integrated circuit, trigger the conducting of control element silicon controlled control end, thereby the tripping coil energising adhesive that makes leakage tripping device drives the tripping mechanism of leakage switch (switch), the active contact of switch is separated with main fixed contact, thereby realize the purpose of automatic disjunction controlled source circuit.The utility model is when externally ambient temperature surpasses certain certain value, can make a response voluntarily, automatically cut off the power supply of its control range circuit, thereby reach when breaking out of fire, can sense ambient temperature raise, automatic power supply breaking operation to the scene of fire, and needn't go to execute-in-place with the manpower parent, its fail safe is good, and the user can relievedly use.Simultaneously, the utility model also can be used for to various low pressure fail, join, the ruuning situation of electric wire in the using electricity system, cable, various jointings monitors, in case certain joint junction is bad when causing its temperature too high because of contacting under "on" position, the utility model can be made a response to it, automatically cut off the electricity supply, the accident that prevents takes place.The utility model does not need existing line is done any change when installing, and the profile installation dimension is identical with original leakage switch, and its cost only exceeds less than 10% than the cost of original leakage switch.The utility model is a kind of function such as detection of electrical leakage that not only has, and the fire automatic protection type leakage switch that also can detect when ambient temperature raises because of certain reason.Its fail safe is good, and the user can relievedly use, and cost is low, installation and easy to use.

4, description of drawings:

Fig. 1 is a theory diagram of the present utility model;

Fig. 2 is a circuit diagram of the present utility model.

5, embodiment:

Embodiment:

Theory diagram of the present utility model includes power circuit (1), current detection circuit (2) as shown in Figure 1, and wherein current detection circuit (2) is connected with power circuit (1), and current detection circuit (2) also is connected with overtemperature prote circuit (3).

Circuit diagram of the present utility model as shown in Figure 2, above-mentioned power circuit (1) includes transformer B, ZCT, the rc filter circuit of forming by resistance R 1, capacitor C 1, the bridge rectifier and the fuse Ru that form by diode D1～D4, current detection circuit (2) includes and detects control integrated circuit U1, voltage stabilizing didoe ZD1, controllable silicon SCR and peripheral cell resistance R 2～R4 thereof, capacitor C 2～C10, overtemperature prote circuit (3) includes the voltage divider of being made up of resistance R 6, thermistor Rt; Wherein the rc filter circuit of being made up of resistance R 1, capacitor C 1 is connected on the secondary coil of transformer ZCT, the input of the bridge rectifier of being made up of diode D1～D4 is connected on the secondary coil of transformer B, and fuse Ru is connected two inputs of bridge rectifier; The two ends of controllable silicon SCR, by resistance R 6, the voltage divider that thermistor Rt forms is connected with the output of bridge rectifier respectively, the negative electrode of voltage stabilizing didoe ZD1 is connected with the output of bridge rectifier by capacitor C 9, the end of capacitor C 2～C7 is connected with an output of bridge rectifier respectively, the other end of capacitor C 2～C7 is connected with the pin that detects control integrated circuit U1 respectively, the control end of controllable silicon SCR is connected with the pin 7 that detects control integrated circuit U1, another output of bridge rectifier is connected with the pin 8 of U1 by connecting resistance R 3, and the mid point of voltage divider is connected with the breech lock input pin 5 that detects control integrated circuit U1 by voltage stabilizing didoe ZD1.Above-mentioned detection control integrated circuit U1 is an integrated package 54123.The utility model when mounted, thermistor is fixed on the appropriate location of housing, and the first half of thermistor is protruded outside housing, and be beneficial to the variation of sensing ambient temperature, other element except that temperature-sensitive resistance all is welded on the printed circuit board (PCB).

When the utility model uses; the voltage divider of forming by resistance R 6, thermistor Rt; because the Lower Half of voltage divider is equipped with a thermistor Rt; and its parameter adjustment (45 ° below C) when Normal Environmental Temperature does not puncture (this scope is an adjustable value); the former input voltage that the breech lock that detects control integrated circuit U1 is imported pin 5 is without any influence, and this switch is the same operate as normal with common leakage switch just.

When on-the-spot breaking out of fire causes ambient temperature to raise, by temperature-sensing element---when thermistor Rt sensed, this thermistor resistance increased, and voltage divider dividing potential drop ratio is changed, and its mid point connects the end-point voltage rising of voltage stabilizing didoe ZD1.When this point voltage rises to the puncture voltage of voltage stabilizing didoe ZD1 (puncture voltage of this element running parameter of looking the temperature spot of required control action and thermistor is adjusted flexibly and selected for use), the breech lock input pin 5 that detects control integrated circuit U1 is idiostatic with the voltage divider mid point owing to the conducting of voltage stabilizing didoe ZD1, and its voltage is increased to it more than cut-in voltage, thereby opens latch circuit; Triggering signal of 7 pin output by U1, trigger the control end conducting of control element controllable silicon SCR, thereby the tripping coil energising adhesive that makes leakage tripping device drives the tripping mechanism of leakage switch (switch), the active contact of switch is separated with main fixed contact, thereby realize the purpose of automatic disjunction controlled source circuit.Simultaneously, the utility model also can be used for to various low pressure fail, join, the ruuning situation of electric wire in the using electricity system, cable, various jointings monitors, in case certain joint junction is bad when causing its temperature too high because of contacting under "on" position, the utility model can be made a response to it, automatically cut off the electricity supply, the accident that prevents takes place.

Claims

1, a kind of fire automatic protection type leakage switch includes power circuit (1), current detection circuit (2), and wherein current detection circuit (2) is connected with power circuit (1), it is characterized in that current detection circuit (2) also is connected with overtemperature prote circuit (3).

2, fire automatic protection type leakage switch according to claim 1, it is characterized in that above-mentioned power circuit (1) includes transformer B, ZCT, the rc filter circuit of forming by resistance R 1, capacitor C 1, the bridge rectifier and the fuse Ru that form by diode D1～D4, current detection circuit (2) includes and detects control integrated circuit U1, voltage stabilizing didoe ZD1, controllable silicon SCR and peripheral cell resistance R 2～R4 thereof, capacitor C 2～C10, overtemperature prote circuit (3) includes the voltage divider of being made up of resistance R 6, thermistor Rt; Wherein the rc filter circuit of being made up of resistance R 1, capacitor C 1 is connected on the secondary coil of transformer ZCT, the input of the bridge rectifier of being made up of diode D1～D4 is connected on the secondary coil of transformer B, and fuse Ru is connected two inputs of bridge rectifier; The two ends of controllable silicon SCR, by resistance R 6, the voltage divider that thermistor Rt forms is connected with the output of bridge rectifier respectively, the negative electrode of voltage stabilizing didoe ZD1 is connected with the output of bridge rectifier by capacitor C 9, the end of capacitor C 2～C7 is connected with an output of bridge rectifier respectively, the other end of capacitor C 2～C7 is connected with the pin that detects control integrated circuit U1 respectively, the control end of controllable silicon SCR is connected with the pin 7 that detects control integrated circuit U1, another output of bridge rectifier is connected with the pin 8 of U1 by connecting resistance R 3, and the mid point of voltage divider is connected with the breech lock input pin 5 that detects control integrated circuit U1 by voltage stabilizing didoe ZD1.

3, fire automatic protection type leakage switch according to claim 2 is characterized in that above-mentioned detection control integrated circuit U1 is an integrated package 54123.