CN221040227U - Fault detector for leakage fire alarm - Google Patents

Abstract

The utility model discloses a fault detector of a leakage fire alarm, which comprises a leakage current simulation circuit and a fault detection circuit, wherein the leakage current simulation circuit comprises a storage battery, a switch, an inverter and a potentiometer which are connected in a loop, an output loop of the inverter consists of an inner wiring and an outer wiring, the outer wiring surrounds the alternating current transformer and is connected to the inner wiring through a connector, and the potentiometer is used for adjusting the output simulated leakage current; the fault detection circuit comprises a singlechip and a digital display ammeter, a liquid crystal display screen and a keyboard which are connected with the singlechip, wherein the singlechip is connected with a storage battery, and the singlechip stores an analog leakage current value of the leakage current analog circuit for triggering the leakage fire alarm to alarm and compares the triggered analog leakage current value with a standard leakage current value to judge whether the leakage fire alarm has faults. The utility model has the rapidness and accuracy of judgment.

Description

Fault detector for leakage fire alarm

Technical Field

The utility model relates to the technical field of constructional engineering, in particular to a fault detector for an electric leakage fire alarm.

Background

In the building electromechanical installation industry, fire disasters caused by aging of electrical elements and cables and damage of equipment in a building are relatively large in large-scale fire disasters of buildings in the past year. For this purpose, an electric leakage fire alarm is installed in the electric circuit of the power supply system to detect the residual current value in the electric circuit and collect the signal to the monitoring host. Wherein the leakage fire alarm is also called a leakage fire alarm detector. The leakage fire alarm can only detect whether the electric loop signal is off-line or not and whether the residual current exceeds the standard, and when the signal shows that the residual current exceeds the standard, the leakage alarm is sent. However, when the electric leakage fire alarm system fails, the electric leakage fire alarm system shows the conditions of no alarm, false alarm, alarm threshold deviation and the like, and at the moment, the electric leakage fire alarm device cannot detect whether the electric circuit has the electric leakage phenomenon or not, and cannot truly reflect whether the electric circuit has the electric leakage fire hidden trouble caused by the electric leakage accident or not. Therefore, how to determine whether the leakage fire alarm fails is a technical problem that needs to be solved in the art.

Disclosure of utility model

The utility model aims to provide a fault detector for an electric leakage fire alarm, which is used for solving the problem of judging whether the electric leakage fire alarm has faults or not.

In order to achieve the above object, the present utility model provides a fault detector for an electric leakage fire alarm, comprising:

The leakage current simulation circuit is used for outputting simulated leakage current and loading the simulated leakage current onto the leakage fire alarm through an alternating current transformer of a leakage fire alarm detection loop, and comprises a storage battery, a switch, an inverter and a potentiometer which are connected in a loop, wherein the switch is connected to a power supply line of the storage battery, an output loop of the inverter consists of an inner wiring and an outer wiring, the outer wiring surrounds the alternating current transformer and is connected to the inner wiring through a connector, the potentiometer is connected to the inner wiring, and the potentiometer is used for controlling the load of the output loop of the inverter and the magnitude of the simulated leakage current output by the output loop of the inverter;

The fault detection circuit comprises a single chip microcomputer and a digital display ammeter, a liquid crystal display and a keyboard, wherein the digital display ammeter, the liquid crystal display and the keyboard are connected with the single chip microcomputer, the digital display ammeter is connected with the storage battery circuit and is used for detecting the value of the analog leakage current output by the leakage current analog circuit, the liquid crystal display is used for displaying the analog leakage current value detected by the digital display ammeter, the single chip microcomputer stores the analog leakage current values of the leakage current analog circuit triggering the leakage fire alarm to alarm through keyboard codes at different positions, and the triggering analog leakage current value is compared with the standard leakage current value to judge whether the leakage fire alarm breaks down.

Further, the fault detector of the leakage fire alarm provided by the utility model further comprises:

and the digital ammeter is used for replacing the digital display ammeter.

Further, the fault detector of the electric leakage fire alarm provided by the utility model is also used for detecting the alternating voltage signal of the output loop of the inverter and displaying the alternating voltage signal on the liquid crystal display screen so as to judge the electric quantity of the storage battery.

Further, the fault detector of the leakage fire alarm provided by the utility model further comprises:

and the digital ammeter and the digital voltmeter are used for replacing the digital ammeter.

Further, the fault detector of the leakage fire alarm provided by the utility model further comprises:

The storage battery, the inverter, the potentiometer and the digital display ammeter are positioned in the shell, and the switch, the liquid crystal display screen and the keyboard are arranged on the shell;

a knob mounted on the potentiometer and disposed on the housing.

The power supply indicator lamp is connected to the power supply line of the storage battery and is arranged on the shell.

Further, the fault detector of the leakage fire alarm provided by the utility model further comprises:

The data interface is connected with the singlechip and is arranged on the shell.

Further, the utility model provides the fault detector for the electric leakage fire alarm, and the connector is arranged on the shell.

Compared with the prior art, the utility model has the following beneficial effects:

The fault detector for the electric leakage fire alarm provided by the utility model has the advantages that the electric leakage current is simulated and output by the electric leakage current simulation circuit and is loaded onto the alternating current transformer of the electric leakage fire alarm detection circuit, the alternating current transformer loads the simulated electric leakage current onto the electric leakage fire alarm, the electric leakage fire alarm judges whether an alarm is given out or not according to the loaded simulated electric leakage current value, and the fault detection circuit compares the triggered simulated electric leakage current value triggering the electric leakage fire alarm to give out an alarm with the standard electric leakage current value to judge whether the electric leakage fire alarm breaks down or not.

The fault detector for the electric leakage fire alarm provided by the utility model has the advantages that the external connection line of the electric leakage current analog circuit is connected to the internal connection line in the positive and negative twice, the average value of the trigger analog electric leakage current value is determined through the singlechip, and then the average value of the twice-triggered analog electric leakage current value is compared with the standard electric leakage current value through the singlechip to judge whether the electric leakage fire alarm breaks down, so that the loading of the same-direction analog electric leakage current to the detection loop of the electric leakage fire alarm can be avoided, the current deviation of the detection loop can be corrected, and the accuracy of judging whether the electric leakage fire alarm breaks down is improved.

When the detection result determines that the electric leakage fire alarm is normal and the electric leakage fire alarm does not alarm, the electric leakage fire alarm fault detector provided by the utility model can judge that no electric leakage occurs on a detection loop and a corresponding electric loop of the electric leakage fire alarm, and the possibility of fire caused by electric leakage is avoided; when the detection result determines that the electric leakage fire alarm fails, the situation of whether electric leakage current exists on the electric loop cannot be accurately reflected, and fire safety hazards caused by electric leakage possibly exist, the electric leakage fire alarm should be maintained or replaced timely so as to monitor the fire safety hazards of the electric loop and a power grid thereof, and the electric fire hazards caused by electric leakage of buildings, factories and the like are reduced.

The fault detector for the electric leakage fire alarm provided by the utility model can judge on line, is simple, convenient and quick in detection operation, does not need to disconnect a detection loop or carry out fault detection on the electric leakage fire alarm off line, and reduces the installation and maintenance cost of operators on the electric leakage fire alarm detection loop.

Drawings

FIG. 1 is a schematic diagram of the internal circuit structure of a fault detector of an electric leakage fire alarm;

FIG. 2 is a block schematic diagram of a fault detector of the leakage fire alarm;

Fig. 3 to 4 are schematic perspective views of fault detectors of the electric leakage fire alarm;

FIG. 5 is a schematic view of the structure of the fault detector of the leakage fire alarm in the use state;

the figure shows:

100. a fault detector for the electric leakage fire alarm;

110. The leakage current simulation circuit comprises a leakage current simulation circuit, 111, a storage battery, 112, a switch, 113, an inverter, 114, a potentiometer, 115, a power indicator, 116, an inner wiring, 117, an outer wiring, 118 and a connector;

120. the fault detection circuit 121, the singlechip, 122, the digital display ammeter 123, the liquid crystal display screen 124, the keyboard 125 and the data interface;

130. a housing;

140. A knob;

200. The detection circuit of the electric leakage fire alarm comprises a detection circuit 210, an alternating current transformer 220, the electric leakage fire alarm 230, a circuit breaker 240 and a zero line terminal block.

Detailed Description

The utility model is described in detail below with reference to the attached drawing figures: the advantages and features of the present utility model will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the utility model.

Referring to fig. 1 to 5, an embodiment of the present utility model provides a fault detector 100 for an electric leakage fire alarm, including an electric leakage current analog circuit 110 and a fault detection circuit 120, wherein:

The leakage current simulation circuit 110 is used for outputting simulated leakage current and loading the simulated leakage current onto the leakage fire alarm 220 through the alternating current transformer 210 of the leakage fire alarm detection circuit 200, and comprises a storage battery 111, a switch 112, an inverter 113 and a potentiometer 114 which are connected in a loop mode, wherein the switch 112 is connected to a power supply line of the storage battery 111, an output loop of the inverter 113 is composed of an inner wiring 116 and an outer wiring 117, the outer wiring 117 surrounds the alternating current transformer 210 and is connected to the inner wiring 116 through a connector 118, the potentiometer 114 is connected to the inner wiring 116, and the potentiometer 114 is used for adjusting the magnitude of the simulated leakage current output by the output loop of the inverter 113. The output circuit of the inverter 113 is a potentiometer 114 with an internal connection 116 and an external connection 117 connected to the output end of the inverter 113. Wherein the switch 112 may be a gangboard switch.

The fault detection circuit 120, the fault detection circuit 120 includes a single chip microcomputer 121 and a digital display ammeter 122, a liquid crystal display 123 and a keyboard 124 connected with the single chip microcomputer 121, the digital display ammeter 122 is connected with the storage battery 111 in a circuit manner, and is used for detecting the value of the analog leakage current output by the leakage current analog circuit 110, the liquid crystal display 123 is used for displaying the analog leakage current value detected by the digital display ammeter 122, the single chip microcomputer 121 stores the analog leakage current values of the leakage current analog circuit 110 at different positions through the keyboard 124 in a coding manner, and the analog leakage current values triggered by the analog leakage current analog circuit 110 trigger the leakage fire alarm 220 to alarm and compare with the standard leakage current values to judge whether the leakage fire alarm 220 fails.

Referring to fig. 1, in order to monitor the electric quantity of the storage battery 111, in the fault detector 100 for an electric leakage fire alarm provided by the embodiment of the utility model, the digital display ammeter 122 is further configured to detect an ac voltage signal of an output loop of the inverter 113 and display the ac voltage signal on the liquid crystal display 123, so as to determine the electric quantity of the storage battery 111. That is, since the output voltage value of the inverter 113 is lower than the voltage value output from the battery 111, the amount of electricity of the battery 111 can be determined by the ac voltage signal of the output circuit of the inverter 113. Wherein the digital display meter 122 is capable of measuring both the ac voltage signal and the ac current signal.

In order to achieve the object of the present utility model, the fault detector 100 for an electric leakage fire alarm provided in the embodiment of the present utility model may further include:

And a digital ammeter for replacing the digital ammeter 122. That is, the digital ammeter 122 may be replaced with a digital ammeter without taking the monitoring of the electric quantity of the storage battery 111 into consideration.

In order to achieve the purpose of measuring ac voltage signals and ac voltage signals, the fault detector 100 for an electric leakage fire alarm provided in the embodiment of the present utility model may further include:

A digital ammeter and a digital voltmeter, which are used for replacing the digital ammeter 122. I.e., by replacing the integrated digital electricity meter 122 with a separate digital ammeter and digital voltmeter.

Referring to fig. 1 and fig. 3 to fig. 4, in order to improve safety and convenience, in the embodiment of the present utility model, the fault detector 100 for an electric leakage fire alarm may further include:

A housing 130, the storage battery 111, the inverter 113, the potentiometer 114 and the digital electricity meter 122 are positioned in the housing 130, the switch 112, the liquid crystal display 123 and the keyboard 124 are arranged on the housing 130,

A knob 140 mounted on the potentiometer 114 and disposed on the housing 130.

A power indicator 115 connected to a power supply line of the battery 111, the power indicator 115 being provided in the housing 130. The power indicator 115 can determine whether the power supply of the detector 100 is normal. Of course, when the power indicator 115 is not present, whether the power supply of the detector 100 is normal may be determined by whether the liquid crystal display 123 is turned on.

Referring to fig. 1, in order to find out the installation position of the failed electric leakage fire alarm 220, the fault detection circuit 120 of the present utility model may further include:

The data interface 125 is connected with the singlechip, and the data interface 125 is arranged on the shell 130. The data interface 125 allows the leakage fire alarm 220 that fails at various locations within the building to be retrieved and to notify maintenance personnel for repair, and replacement.

Referring to fig. 1, 3 and 5, in order to facilitate the connection of the external connection wire 117 to the internal connection wire 116, the connector 118 is disposed on the housing 130 according to the embodiment of the present utility model. The connector 118 may be a conventional electrical interface or a terminal.

Referring to fig. 1 to 5, the embodiment of the present utility model further provides a detection method of the foregoing fault detector 100 for an electric leakage fire alarm, which may include:

In step S301, the electric leakage fire alarm failure detector 100 is turned off by the switch 112, and the potentiometer 114 is adjusted to the maximum value. The analog leakage current output at this time is minimal.

In step S302, the external connection line 117 of the leakage current analog circuit 110 passes through the ac transformer 210 of the leakage fire alarm detection circuit 200 and is connected to the internal connection line 116. Wherein the leakage fire alarm detection circuit 200 comprises an ac transformer 210 on the power grid running through the live line L and the neutral line N and a leakage fire alarm 220 connected to said ac transformer 210. The hot line L is typically connected to a circuit breaker 230 within the electrical cabinet and the neutral line N is typically mounted to a neutral terminal block 240 within the electrical cabinet. Wherein the electric cabinet is installed in a large number of buildings.

In step S303, the leakage fire alarm fault detector 100 is turned on by the switch 112, the potentiometer 114 is controlled by the knob 140 to gradually increase and adjust the magnitude of the analog leakage current outputted by the leakage current analog circuit 110 until the outputted analog leakage current triggers the leakage fire alarm 220 to alarm, and the analog leakage current value triggering the leakage fire alarm 220 to alarm is referred to as the first triggering analog leakage current value.

Step S304, the first trigger analog leakage current value is stored in the singlechip 121 of the fault detection circuit 120 through the keyboard 124 code.

In step S305, the switch 112 turns off the fault detector 100 to adjust the potentiometer 114 to a maximum value.

Step S306, the alarm of the leakage fire alarm 220 is released.

In step S307, both ends of the outer wire 117 are connected to the inner wire 116 in opposite directions. I.e. the previous connection of the external connection 117 is a positive connection and the current connection is a negative connection.

In step S308, the leakage fire alarm fault detector 100 is turned on by the switch 112, and the magnitude of the analog leakage current outputted by the leakage current analog circuit 110 is gradually increased and adjusted by the potentiometer 114 until the outputted analog leakage current triggers the leakage fire alarm 220 to alarm, and the analog leakage current value triggering the leakage fire alarm 220 to alarm is referred to as a second triggering analog leakage current value.

In step S309, the second trigger analog leakage current value is stored in the singlechip 121 of the fault detection circuit 120 through the keyboard 124 code.

In step S310, the single-chip microcomputer 121 of the fault detection circuit 120 compares the average value of the two triggered analog leakage current values with the standard leakage current value to determine whether the leakage fire alarm 220 has a fault. When (ia+ib)/2 < Is, confirming that the electric leakage fire alarm 220 Is normal, otherwise confirming that the electric leakage fire alarm 220 Is faulty, wherein Ia Is the first triggering analog electric leakage current value, ib Is the second triggering analog electric leakage current value, and Is the standard electric leakage current value. The standard leakage current value Is 500mA, and can be adjusted adaptively as required.

In order to derive information of the failed electric leakage fire alarm 220, the detection method of the electric leakage fire alarm failure detector 100 provided by the embodiment of the utility model may further include:

In step S311, the singlechip 121 derives the detection result of the electric leakage fire alarm detector 100 through the data interface 125. The data may be exported to a computer in tabular form and the fault summary distributed to service personnel for repair.

In order to distinguish the triggered analog leakage current values of the leakage fire alarms at different positions, the keyboard 124 is a 12-bit coded keyboard 124, and the triggered analog leakage current values of the leakage fire alarms 220 at different positions are recorded by the keyboard 124.

According to the leakage fire alarm fault detector 100 and the detection method thereof provided by the embodiment of the utility model, the simulated leakage current which is simulated and output by the leakage current simulation circuit 110 is loaded onto the alternating current transformer 210 of the leakage fire alarm detection circuit 200, the alternating current transformer 210 loads the simulated leakage current onto the leakage fire alarm 220, the leakage fire alarm 220 judges whether an alarm is given according to the loaded simulated leakage current value, and the fault detection circuit 120 compares the triggered simulated leakage current value which triggers the leakage fire alarm 220 to give an alarm with the standard leakage current value to judge whether the leakage fire alarm 220 has a fault.

According to the detection method of the leakage fire alarm fault detector 100 provided by the embodiment of the utility model, the external connection line 117 of the leakage current analog circuit 110 is connected to the internal connection line 116 in the positive and negative twice, the average value of the trigger analog leakage current value is determined through the single chip microcomputer 121, then the average value of the twice trigger analog leakage current value is compared with the standard leakage current value through the single chip microcomputer 121 to judge whether the leakage fire alarm 220 has a fault or not, the loading of the same-direction analog leakage current to the leakage fire alarm detection circuit 200 can be avoided, the current deviation of the detection circuit can be corrected, and the accuracy of judging whether the leakage fire alarm 220 has a fault or not is improved.

According to the leakage fire alarm fault detector 100 and the detection method thereof provided by the embodiment of the utility model, when the detection result determines that the leakage fire alarm 220 is normal and the leakage fire alarm 220 does not alarm, the detection loop of the leakage fire alarm 220 and the corresponding electrical loop can be judged that no leakage occurs, and the possibility of fire caused by leakage cannot be generated; when the detection result determines that the leakage fire alarm 220 fails, it cannot accurately reflect whether the leakage current exists in the electrical loop, and fire safety hazards caused by leakage may exist, and the leakage fire alarm 220 should be maintained or replaced in time to monitor the fire safety hazards of the electrical loop and the power grid thereof, so as to reduce the electrical fire hazards caused by leakage in building, factories and the like.

The fault detector 100 for the electric leakage fire alarm and the detection method thereof provided by the embodiment of the utility model can judge on line, are simple, convenient and quick in detection operation, do not need to disconnect a detection loop or offline detect faults of the electric leakage fire alarm 220 by an electric loop, and reduce the installation and maintenance cost of operators on the electric leakage fire alarm detection loop.

The fault detector 100 and the detection method of the electric leakage fire alarm provided by the embodiment of the utility model utilize the principle that the magnitude of electric leakage current is calculated by vector summation of zero sequence currents in the detection loop 200 of the electric leakage fire alarm. In operation, an additional equidirectional adjustable alternating current (i.e. analog leakage current) is manually applied to the alternating current transformer 210, and the current magnitude is gradually increased, so that the zero sequence current vector sum in the alternating current transformer 210 is gradually increased beyond the alarm threshold value of the leakage fire alarm 220, and whether the leakage fire alarm 220 can generate an alarm by itself or how much current can cause the leakage fire alarm to generate an alarm is observed.

The present utility model is not limited to the above-described embodiments, but rather, the above-described embodiments are merely examples of some, but not all embodiments of the present utility model. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the utility model, fall within the scope of protection of the utility model. Other levels of modification and variation to the present utility model may occur to those skilled in the art. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims.

Claims (7)

1. A fault detector for an electric leakage fire alarm, comprising:

The leakage current simulation circuit is used for outputting simulated leakage current and loading the simulated leakage current onto the leakage fire alarm through an alternating current transformer of a leakage fire alarm detection loop, and comprises a storage battery, a switch, an inverter and a potentiometer which are connected in a loop, wherein the switch is connected to a power supply line of the storage battery, an output loop of the inverter consists of an inner wiring and an outer wiring, the outer wiring surrounds the alternating current transformer and is connected to the inner wiring through a connector, the potentiometer is connected to the inner wiring, and the potentiometer is used for controlling the load of the output loop of the inverter and the magnitude of the simulated leakage current output by the output loop of the inverter;

The fault detection circuit comprises a single chip microcomputer and a digital display ammeter, a liquid crystal display and a keyboard, wherein the digital display ammeter, the liquid crystal display and the keyboard are connected with the single chip microcomputer, the digital display ammeter is connected with the storage battery circuit and used for detecting the value of the analog leakage current output by the leakage current analog circuit, the liquid crystal display is used for displaying the analog leakage current value detected by the digital display ammeter, and the single chip microcomputer stores the analog leakage current values of the leakage current analog circuit triggering the leakage fire alarm to alarm through the keyboard codes at different positions and compares the analog leakage current values with the standard leakage current values to judge whether the leakage fire alarm breaks down.

2. The electrical leakage fire alarm fault detector of claim 1, further comprising:

and the digital ammeter is used for replacing the digital display ammeter.

3. The apparatus of claim 1, wherein the digital electricity meter is further configured to detect an ac voltage signal of the output loop of the inverter and display the ac voltage signal on the lcd to determine the amount of electricity of the battery.

4. A leakage fire alarm fault detector as defined in claim 3, further comprising:

and the digital ammeter and the digital voltmeter are used for replacing the digital ammeter.

5. The electrical leakage fire alarm fault detector of claim 1, further comprising:

The storage battery, the inverter, the potentiometer and the digital display ammeter are positioned in the shell, and the switch, the liquid crystal display screen and the keyboard are arranged on the shell;

A knob mounted on the potentiometer and disposed on the housing;

the power supply indicator lamp is connected to the power supply line of the storage battery and is arranged on the shell.

6. The electrical leakage fire alarm fault detector of claim 5, wherein the fault detection circuit further comprises:

The data interface is connected with the singlechip and is arranged on the shell.

7. The electrical leakage fire alarm fault detector of claim 5, wherein the connector is disposed on the housing.