CN210324477U - Detection device of electric leakage fire detector - Google Patents
Detection device of electric leakage fire detector Download PDFInfo
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- CN210324477U CN210324477U CN201921928598.5U CN201921928598U CN210324477U CN 210324477 U CN210324477 U CN 210324477U CN 201921928598 U CN201921928598 U CN 201921928598U CN 210324477 U CN210324477 U CN 210324477U
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Abstract
The utility model relates to a detection device of a leakage fire detector, which comprises a current induction part, a current detection part and a detection part, wherein the current induction part is used for inducing the current in the leakage fire detector and outputting a current signal; the current detection part is preset with a current upper limit signal, receives the current signal and compares the current signal with the current upper limit signal, and outputs a high level comparison signal when the current signal is greater than the current upper limit signal and outputs a low level comparison signal when the current signal is less than the current upper limit signal; a signal conversion part for receiving the low level comparison signal and outputting a high level trigger signal; the safety prompting part receives the high-level trigger signal and reminds that the current is normal; a signal switching part for receiving the high level comparison signal and outputting a switching signal; a remote alarm part for receiving the switching signal and responding to the switching signal to alarm remotely; and the detector control part receives the switching signal and controls the detector to stop working in response to the switching signal. The utility model discloses can detect the warning to the inside operating current of electric leakage fire detector, reduce the damage of detector.
Description
Technical Field
The utility model belongs to the technical field of electric leakage fire detector's technique and specifically relates to a detection device for electric leakage fire detector is related to.
Background
The existing electric leakage fire detector, such as the detection protection device for the electric leakage fire detector disclosed in application publication No. CN108686319A, comprises a fireproof layer, a moving mechanism, an electric leakage fire detector body, an electric wire, a driving mechanism and the like; the wall body is internally provided with a cavity, the wall body at the periphery of the cavity is provided with a protective cover, the right side of the top of the protective cover is provided with a through wire hole, the cavity is internally provided with a fireproof layer, and the fireproof layer is provided with a moving mechanism and a protective mechanism.
The above prior art solutions have the following drawbacks: the damage of a fire to the electric leakage fire detector can be reduced by the fireproof layer in the using process of the electric leakage fire detector, but the method for damaging the electric leakage fire detector can also be that the current inside the detector is overloaded when the detector works, and the detection and protection device of the electric leakage fire detector cannot effectively protect the detector when the current inside the detector is overloaded, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a = detection device of electric leakage fire detector can detect the warning to the inside operating current of detector, reduces the damage of detector.
The above utility model discloses an above-mentioned utility model purpose can realize through following technical scheme: a detecting device of an electric leakage fire detector, comprising:
the current sensing part is used for sensing the current in the electric leakage fire detector in real time and outputting a current signal;
the current detection part is preset with a current upper limit signal, is coupled to the current induction part to receive the current signal and compare the current signal with the current upper limit signal, and outputs a high level comparison signal when the current signal is greater than the current upper limit signal and outputs a low level comparison signal when the current signal is less than the current upper limit signal;
the signal conversion part is coupled with the current detection part to receive the low-level comparison signal, perform conversion processing and output a high-level trigger signal;
the safety prompting part is coupled with the signal conversion part to receive the high-level trigger signal and remind that the current in the detector is normal;
the signal switch part is coupled with the current detection part to receive the high-level comparison signal and output a switch signal;
the remote alarm part is coupled with the signal switch part to receive the switch signal and respond to the switch signal to carry out remote alarm;
and the detector control part is coupled with the signal switching part to receive the switching signal and control the detector to stop working in response to the switching signal.
By adopting the technical scheme, after the detector is installed, the current sensing part senses the current in the detector in real time and outputs a current signal, and when the current signal is smaller than the current upper limit signal, the safety prompting part prompts that the current in the detector is normal; when the current signal is greater than the current upper limit signal, the signal switch part outputs a switch signal, and triggers the remote alarm part to perform remote alarm and the detector control part stops the work of the detector, so that the work of the detector can be stopped in time when the current inside the detector is overloaded, the staff can be remotely reminded, and the damage to the detector can be reduced.
Preferably, the current detection portion includes a current comparison unit, a current reference unit and a current adjustment unit, the current comparison unit is coupled to the current sensing portion to receive the current signal and output a comparison signal, the current reference unit is coupled to the current comparison unit and provides a current upper limit signal, and the current adjustment unit is coupled to the current reference unit and is configured to adjust a magnitude of the current upper limit signal.
By adopting the technical scheme, the current upper limit signal is the maximum current value which can be borne by the electric leakage fire detector, but the maximum current values which can be borne by the electric leakage fire detectors of different types are different, and the voltage adjusting part is arranged to adjust the current upper limit signal so as to adapt to the electric leakage fire detectors of different types.
Preferably, the safety prompt part includes a signal oscillation unit and a light emitting unit, the signal oscillation unit is coupled to the signal conversion part to receive the high level trigger signal and output an oscillation trigger signal, and the light emitting unit is coupled to an output end of the signal oscillation unit to receive the oscillation trigger signal and perform an intermittent light emission prompt in response to the oscillation trigger signal.
By adopting the technical scheme, the signal oscillation unit is arranged to intermittently output the oscillation trigger signal for triggering the light-emitting unit to work so as to improve the prompting effect of the safety prompting part.
Preferably, the remote alarm part comprises a signal transmitting unit, a signal receiving unit and a sound prompting unit, wherein the signal transmitting unit is coupled to the signal switching part to receive the switching signal and transmit the switching signal, the signal receiving unit is wirelessly coupled to the signal transmitting unit to receive the switching signal, and the sound prompting unit is coupled to the signal receiving unit to receive the switching signal and perform sound alarm in response to the switching signal.
Through adopting above-mentioned technical scheme, when the staff is not near electric leakage fire detector position, through setting up long-range warning mechanism to carry out long-range warning when transshipping to electric leakage fire detector internal current, so that the staff in time knows.
Preferably, the detector control part comprises a signal control unit and a detector control unit, the signal control unit is coupled to the signal switch part to receive the switch signal and output a control signal, and the detector control unit is coupled to an output end of the signal control unit to receive the control signal and control the detector to stop working in response to the control signal.
By adopting the technical scheme, the detector control unit can control the on-off of the detector, and once the signal control unit receives the switch signal, the signal control unit can be triggered to work in time and control the on-off of the detector, so that the protection effect on the detector is enhanced.
Preferably, the signal control unit comprises a trigger unit and a photoelectric conversion unit; the triggering unit is coupled to the signal switching part to receive the switching signal and output a triggering signal, and the photoelectric conversion unit is coupled to an output end of the triggering unit to receive the triggering signal and convert the triggering signal into an optical signal for output.
By adopting the technical scheme, the photoelectric conversion unit is arranged to convert the trigger electric signal into the trigger optical signal to be output, so that the signal transmission speed is improved, and the interference in the signal transmission process is reduced.
Preferably, the detector control unit includes a start unit, a detector power interface, and a VDD power supply, and the start unit is coupled to the output end of the photoelectric conversion unit to receive the optical signal and start the photoelectric conversion unit, so as to cut off the circuit connection between the detector power interface and the VDD power supply.
By adopting the technical scheme, the VDD power supply supplies power to the detector, the starting unit is connected with the power interface of the VDD power supply and the detector, and the circuit connection between the detector and the VDD power supply can be cut off when the starting unit receives the trigger light signal.
Preferably, a signal filtering unit is coupled between the photoelectric conversion unit and the activation unit.
By adopting the technical scheme, the signal filtering part is arranged to further remove impurities from the sent trigger optical signal, so that the interference on the signal in the signal transmission process is further reduced.
To sum up, the utility model discloses a beneficial technological effect does:
when the current signal that current induction part response is greater than the electric current upper limit signal, trigger remote alarm portion and carry out remote alarm and detector control portion stop the work of detector to in time stop the work of detector, and long-range warning staff is favorable to reducing the damage of detector.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic diagram of the circuit structure of the present invention.
Fig. 3 is a schematic diagram of the circuit structure of the present invention.
In the figure, 1, a current sensing part; 2. a current detection unit; 21. a current comparison unit; 22. a current reference unit; 23. a current adjusting unit; 3. a signal conversion section; 4. a safety prompting part; 41. a signal oscillation unit; 42. a light emitting unit; 5. a signal switch section; 6. a remote alarm section; 61. a signal transmitting unit; 62. a signal receiving unit; 63. a sound prompt unit; 7. a detector control unit; 71. a signal control unit; 711. a trigger unit; 712. a photoelectric conversion unit; 72. a detector control unit; 721. a start unit; 722. a detector power interface; 8. a signal filtering part.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, for the utility model discloses a detection device of electric leakage fire detector, including current induction portion 1, current detection portion 2, signal conversion portion 3, safety suggestion portion 4, signal switch portion 5, remote alarm portion 6 and detector control portion 7.
Referring to fig. 2, the current sensing part 1 is used for sensing a current inside the electric leakage fire detector in real time and outputting a current signal, the current sensing part 1 includes a first resistor R1, a second resistor R2 and a current sensor RA, and the type of the current sensor RA in this embodiment is preferably HKA-3 YSD; the current sensor RA senses the current inside the electric leakage fire detector in real time, converts the current physical quantity into a current signal and outputs the current signal, one end of the current sensor RA is coupled to one ends of the first resistor R1 and the second resistor R2, the other end of the first resistor R1 is coupled to VCC voltage, and the other end of the second resistor R2 is coupled to the current detection part 2.
A current upper limit signal is preset in the current detection part 2, the current upper limit signal is the maximum value of current which can be borne by the electric leakage fire detector, and the numerical value of the current upper limit signal in the embodiment is preferably 500 mA; the current detection unit 2 is coupled to the current sensor RA to receive the current signal and compare the current signal with the current upper limit signal, and outputs a high level comparison signal when the current signal is greater than the current upper limit signal, and outputs a low level comparison signal when the current signal is less than the current upper limit signal.
The current detection portion 2 includes a current comparison unit 21, a current reference unit 22 and a current regulation unit 23, the current comparison unit 21 is coupled to the current sensor RA to receive a current signal, the current reference unit 22 is coupled to the current comparison unit 21 and provides a current upper limit signal, the current regulation unit 23 is coupled to the current reference unit 22 and is configured to regulate the magnitude of the current upper limit signal to adapt to the electric leakage fire detector with different bearable maximum values of current, in this embodiment, the regulation range of the current regulation unit 23 for the current upper limit signal is preferably 300mA to 500 mA.
The current comparison unit 21 comprises a comparator N1, a third resistor R3, a fourth resistor R4 and a first capacitor C1, wherein the model of the comparator N1 is preferably LM 311; a VDD terminal of the comparator N1 is coupled to the VCC voltage, a VSS terminal is grounded, a non-inverting input terminal of the comparator N1 is coupled to the second resistor R2 through the third resistor R3 and is coupled to one end of the fourth resistor R4 and the first capacitor C1, an inverting input terminal of the comparator N1 is coupled to the current reference unit 22, and an output terminal of the comparator N1 is coupled to the signal conversion unit 3, the signal switch unit 5, the fourth resistor R4, and the other end of the first capacitor C1; the current reference unit 22 comprises a fifth resistor R5 and a sixth resistor R6, the current regulating unit 23 comprises a slide rheostat RP1, and the type of the slide rheostat RP1 in the embodiment is preferably 3296X-502; the inverting input terminal of the comparator N1 is coupled to one end of the sixth resistor R6, the other end of the sixth resistor R6 is coupled to one ends of the fifth resistor R5 and the sliding resistor RP1, the other end of the fifth resistor R5 is grounded, the other end of the sliding resistor RP1 is coupled to the VCC voltage, the connection point between the fifth resistor R5 and the sixth resistor R6 provides the current upper limit signal, and the resistance value of the connection point between the fifth resistor R5 and the sixth resistor R6 can be changed by the sliding resistor RP1 to change the magnitude of the current upper limit signal.
The signal conversion part 3 is coupled to the current detection part 2 to receive the low level comparison signal and output a high level trigger signal after conversion processing; the safety prompting part 4 is coupled to the signal conversion part 3 to receive the high level trigger signal and perform the normal reminding of the current in the detector.
The signal conversion unit 3 includes an inverter IC1, in this embodiment, the model of the inverter IC1 is preferably SN74LVC1G04, the input terminal of the inverter IC1 is coupled to the output terminal of the comparator N1, the output terminal of the inverter IC1 is coupled to the safety prompt unit 4, and the inverter IC1 receives the low-level comparison signal and converts the low-level comparison signal into the high-level trigger signal to trigger the safety prompt unit 4 to operate.
The safety prompt part 4 includes a signal oscillation unit 41 and a light emitting unit 42, the signal oscillation unit 41 is coupled to the signal conversion part 3 to receive the high level trigger signal and output an oscillation trigger signal, and the light emitting unit 42 is coupled to an output end of the signal oscillation unit 41 to receive the oscillation trigger signal and perform an intermittent light emission prompt in response to the oscillation trigger signal.
The signal oscillating unit 41 includes nand gate circuits a1 and a2, a seventh resistor R7, and a second capacitor C2, and the light emitting unit 42 includes a light emitting diode D1; one input end of the nand gate circuit a1 is coupled to the output end of the inverter IC1, the other input end is coupled to one end of the seventh resistor R7 and one end of the second capacitor C2, the output end of the nand gate circuit a1 is coupled to the other end of the seventh resistor R7 and two input ends of the nand gate circuit a2, the output end of the nand gate circuit a2 is coupled to the other end of the second capacitor C2 and the cathode of the light emitting diode D1, and the anode of the light emitting diode D1 is coupled to the VCC voltage.
When the output end of the inverter IC1 outputs a high-level trigger signal and the second capacitor C2 discharges through the seventh resistor R7, both input ends of the nand gate a1 input a high-level signal, the output end of the nand gate a1 outputs a low-level signal, the input end of the nand gate a2 receives the low-level signal and outputs a high-level signal, and the light-emitting diode D1 emits light; when the output end of the inverter IC1 does not output a high-level trigger signal and the second capacitor C2 is charged through the seventh resistor R7, a low-level signal is input to one input end of the nand gate a1, a high-level signal is input to the other input end of the nand gate a1, a high-level signal is output from the output end of the nand gate a2, a high-level signal is received and a low-level signal is output from the input end of the nand gate a2, and the light emitting diode D1 stops emitting light.
Referring to fig. 2 and 3, the signal switching part 5 is coupled to the current detecting part 2 to receive the high level comparison signal and output a switching signal, and the remote alarm part 6 is coupled to the signal switching part 5 to receive the switching signal and perform a remote alarm in response to the switching signal; the remote alarm part comprises a signal transmitting unit 61, a signal receiving unit 62 and a sound prompting unit 63, wherein the signal transmitting unit 61 is coupled to the signal switching part 5 to receive and transmit the switching signal, the signal receiving unit 62 is wirelessly coupled to the signal transmitting unit 61 to receive the switching signal, and the sound prompting unit 63 is coupled to the signal receiving unit 62 to receive the switching signal and respond to the switching signal to perform sound alarm.
The signal switch part 5 comprises a relay KM1, the relay KM1 in the embodiment is preferably HH52P 1; the signal transmitting unit 61 comprises a normally open contact KM1-2 controlled by a relay KM1, a VDD power supply and a transmitter, the signal receiving unit 62 comprises a receiver and a tenth resistor R10, and the sound prompting unit 63 comprises a sound alarm HA; normally open contact KM-2's one end is coupled in the positive pole of VDD power, and the other end is coupled in the transmitter with the negative pole of VDD power, and the transmitter passes through wireless connection with the receiver, and the one end of receiver is coupled in VCC voltage, and the other end is coupled in audible alarm HA through tenth resistance R10, and receiver and audible alarm HA load in staff's the cell-phone in this embodiment.
The detector control part 7 is coupled to the signal switching part 5 to receive the switching signal and control the detector to stop working in response to the switching signal; the detector control part 7 includes a signal control unit 71 and a detector control unit 72, the signal control unit 71 is coupled to the signal switching part 5 to receive the switching signal and output a control signal, and the detector control unit 72 is coupled to an output end of the signal control unit 71 to receive the control signal and control the detector to stop working in response to the control signal.
The signal control unit 71 includes a trigger unit 711 and a photoelectric conversion unit 712; the trigger unit 711 is coupled to the signal switch portion 5 to receive the switch signal and output the trigger signal, and the photoelectric conversion unit 712 is coupled to the output end of the trigger unit 711 to receive the trigger signal and convert the trigger signal into an optical signal for output.
The trigger unit 711 comprises a normally open contact KM1-1 controlled by a relay KM1, an eighth resistor R8 and a triode Q1, wherein the triode Q1 is preferably an NPN triode, the light path conversion unit comprises an optical coupler U1, and the type of the optical coupler U1 is preferably FC-CLC; the two ends of the normally open contact KM-1 are respectively coupled to VCC voltage and one end of an eighth resistor R8, the other end of the eighth resistor R8 is coupled to the base electrode of the triode Q1, the emitter electrode of the triode Q1 is grounded, the collector electrode is coupled to the anode of the diode in the optical coupler U1, the cathode of the diode in the optical coupler U1 is grounded, the emitter electrode of the photosensitive triode in the optical coupler U1 is grounded, and the collector electrode is coupled to the detector control unit 72.
The detector control unit 72 includes a start unit 721, a detector power interface 722, and a VDD power supply, wherein the start unit 721 is coupled to the photoelectric conversion unit 712 to receive the optical signal and start to cut off the circuit connection between the detector power interface 722 and the VDD power supply, and a signal filtering portion 8 is coupled between the start unit 721 and the photoelectric conversion unit 712.
The signal filtering part 8 comprises a ninth resistor R9 and a third capacitor C3, the starting unit 721 comprises a relay KM2 and a normally closed contact KM2-1 controlled by the relay KM2, and the type of the relay KM2 in the embodiment is preferably HH52P 1; one end of a ninth resistor R9 and one end of a third capacitor C3 are coupled to a collector of the photo-transistor in the optocoupler U1, the other end of the third capacitor C3 is grounded, the other end of the ninth resistor R9 is coupled to one end of a relay KM2, the other end of the relay KM2 is coupled to a VCC voltage, one end of a normally closed contact KM2-1 is coupled to an anode of a VDD power supply, and the other end and a cathode of the VDD power supply are coupled to a detector power interface 722.
The implementation principle of the embodiment is as follows:
after the electric leakage fire detector is installed, the current sensor RA senses the current in the electric leakage fire detector in real time and outputs a current signal to the comparator N1, the comparator N1 compares the current signal with an upper limit current signal provided by a connection point between the fifth resistor R5 and the sixth resistor R6 in real time, when the current signal is smaller than the current upper limit signal, the output end of the comparator N1 outputs a low level comparison signal, the inverter IC1 receives the low level comparison signal, converts the low level comparison signal into a high level trigger signal and outputs the high level trigger signal, the second capacitor C2 discharges through the seventh resistor R7, both input terminals of the nand gate circuit a1 input high level signals, the output terminal of the nand gate circuit a1 outputs low level signals, the input end of the NAND gate circuit A2 receives the low level signal and outputs the high level signal, and the light emitting diode D1 emits light to remind that the internal current is normal during electric leakage fire detection.
When the current signal is greater than the current upper limit signal, the output end of the comparator N1 outputs a high-level comparison signal, the inverter IC1 does not output a high-level trigger signal after receiving the high-level comparison signal, when the second capacitor C2 is charged through the seventh resistor R7, one input end of the nand gate circuit a1 inputs a low-level signal, the other input end of the nand gate circuit a1 inputs a high-level signal, the output end of the nand gate circuit a1 outputs a high-level signal, the input end of the nand gate circuit a2 receives the high-level signal and outputs the low-level signal, and the light emitting diode D1 stops emitting light.
And when the current signal is greater than the current upper limit signal, the relay KM1 is conducted and outputs a switch signal, the normally open contact KM1-1 is closed, the triode Q1 is conducted and outputs a trigger signal, the optical coupler U1 works and converts the trigger signal into a trigger light signal for fast output, the relay KM2 is triggered to be conducted after internal interference signals are removed through the ninth resistor R9 and the third capacitor C3, and the relay KM2-1 is disconnected at the moment, so that the connection between the detector power interface 722 and the VDD power supply is disconnected.
When the relay KM1 is conducted and outputs a switch signal, the normally open contact KM1-2 is also closed at the same time, the transmitter is electrified to work, the switch signal is wirelessly transmitted to the receiver in the mobile phone of a worker, and the receiver triggers the sounding alarm HA to work after receiving the switch signal so as to remotely remind the worker of the overload of the current in the electric leakage fire detector.
The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (8)
1. A detection device of an electric leakage fire detector is characterized in that: the method comprises the following steps:
the current sensing part (1) is used for sensing the current in the electric leakage fire detector in real time and outputting a current signal;
the current detection part (2) is preset with a current upper limit signal, is coupled to the current induction part (1) to receive the current signal and compare the current signal with the current upper limit signal, and outputs a high level comparison signal when the current signal is greater than the current upper limit signal and outputs a low level comparison signal when the current signal is less than the current upper limit signal;
the signal conversion part (3) is coupled with the current detection part (2) to receive the low-level comparison signal, perform conversion processing and output a high-level trigger signal;
the safety prompting part (4) is coupled with the signal conversion part (3) to receive the high-level trigger signal and remind that the current in the detector is normal;
a signal switch part (5) coupled to the current detection part (2) to receive the high level comparison signal and output a switch signal;
a remote alarm part (6) coupled to the signal switching part (5) to receive the switching signal and perform remote alarm in response to the switching signal;
and the detector control part (7) is coupled with the signal switch part (5) to receive the switch signal and control the detector to stop working in response to the switch signal.
2. The detecting device of an electric leakage fire detector according to claim 1, wherein: the current detection part (2) comprises a current comparison unit (21), a current reference unit (22) and a current regulation unit (23), wherein the current comparison unit (21) is coupled to the current sensing part (1) to receive a current signal and output a comparison signal, the current reference unit (22) is coupled to the current comparison unit (21) and provides a current upper limit signal, and the current regulation unit (23) is coupled to the current reference unit (22) and is used for regulating the magnitude of the current upper limit signal.
3. The detecting device of an electric leakage fire detector according to claim 1, wherein: the safety prompting part (4) comprises a signal oscillation unit (41) and a light-emitting unit (42), the signal oscillation unit (41) is coupled to the signal conversion part (3) to receive the high-level trigger signal and output an oscillation trigger signal, and the light-emitting unit (42) is coupled to the output end of the signal oscillation unit (41) to receive the oscillation trigger signal and respond to the oscillation trigger signal to perform intermittent light-emitting reminding.
4. The detecting device of an electric leakage fire detector according to claim 1, wherein: the remote alarm part comprises a signal transmitting unit (61), a signal receiving unit (62) and a sound prompting unit (63), wherein the signal transmitting unit (61) is coupled to the signal switch part (5) to receive the switching signal and transmit the switching signal, the signal receiving unit (62) is wirelessly coupled to the signal transmitting unit (61) to receive the switching signal, and the sound prompting unit (63) is coupled to the signal receiving unit (62) to receive the switching signal and respond to the switching signal to perform sound alarm.
5. The detecting device of an electric leakage fire detector according to claim 1, wherein: the detector control part (7) comprises a signal control unit (71) and a detector control unit (72), the signal control unit (71) is coupled to the signal switch part (5) to receive a switch signal and output a control signal, and the detector control unit (72) is coupled to an output end of the signal control unit (71) to receive the control signal and respond to the control signal to control the detector to stop working.
6. The detecting device of an electric leakage fire detector as claimed in claim 5, wherein: the signal control unit (71) comprises a trigger unit (711) and a photoelectric conversion unit (712); the trigger unit (711) is coupled to the signal switch unit (5) to receive a switch signal and output a trigger signal, and the photoelectric conversion unit (712) is coupled to an output end of the trigger unit (711) to receive the trigger signal and convert the trigger signal into an optical signal for output.
7. The detecting device of an electric leakage fire detector as claimed in claim 6, wherein: the detector control unit (72) comprises a starting unit (721), a detector power interface (722) and a VDD power supply, wherein the starting unit (721) is coupled to the output end of the photoelectric conversion unit (712) to receive the optical signal and start, so as to cut off the circuit connection between the detector power interface (722) and the VDD power supply.
8. The detecting device of an electric leakage fire detector as claimed in claim 7, wherein: a signal filtering unit (8) is coupled between the photoelectric conversion unit (712) and the activation unit (721).
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| CN201921928598.5U CN210324477U (en) | 2019-11-08 | 2019-11-08 | Detection device of electric leakage fire detector |
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| CN113619423A (en) * | 2021-09-22 | 2021-11-09 | 国网河南省电力公司平顶山供电公司 | Movable intelligent charging stake |
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| CN113619423A (en) * | 2021-09-22 | 2021-11-09 | 国网河南省电力公司平顶山供电公司 | Movable intelligent charging stake |
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