Five-prevention audible and visual alarm apparatus for switchgear

Abstract

A five-prevention audible and visual alarm apparatus for a switchgear, comprising: a power supply unit, a state indication unit, an audible warning unit, and a visual warning unit. The power supply unit outputs a low-voltage direct current, and provides a working voltage for the state indication unit, the audible warning unit, and the visual warning unit. The audible warning unit and the visual warning unit work cooperatively. The visual warning unit comprises a plurality of parallel detection branches. Each detection branch corresponds to a working compartment in a switchgear and is provided with an indicator light (10). When a door of a live working compartment is opened, the indicator light (10) emits light to provide a warning. Simultaneously, the audible warning unit is triggered to provide an audible warning. In the case of accidentally entering a live compartment when a device is not allowed to be operated, an audible alarm and a visual alarm will be triggered to give alerts, thereby enhancing device safety and reducing the likelihood of accidents.

Description

A five-proof sound and light alarm device for switch cabinets Technical Field

[0001] This invention relates to the field of switchgear, and in particular to a five-proof audible and visual alarm device for switchgear. Background Technology

[0002] The five electrical safety precautions refer to: preventing accidental opening or closing of circuit breakers; preventing opening or closing disconnect switches under load; preventing the connection (or closing) of grounding wires (grounding switches) while energized; preventing energizing with grounding wires connected; and preventing accidental entry into energized compartments. Existing five-prevention interlocking devices are all silent mechanical interlocks, meaning the circuit breaker cabinet door is locked only during equipment operation and cannot be opened. They lack other warning functions and fail to ensure the operator understands the correctness of the operating interval. Furthermore, mechanical mechanisms have a high failure rate, and there is a possibility of accidents caused by operators mistakenly entering the wrong compartment and forcibly opening the cabinet door, believing it to be faulty.

[0003] Therefore, the "five-prevention" interlocking device, which can promptly trigger misoperation signals, is of great significance in actual production processes. Compared to a purely mechanical and silent "five-prevention" device, the presence of an alarm sound and warning light when someone accidentally enters the designated area when the equipment is not permitted to operate will improve equipment safety and reduce the accident rate. Summary of the Invention

[0004] The purpose of this invention is to provide an alarm sound and light reminder when the equipment is accidentally entered into a compartment when it is not allowed to be operated, which will improve equipment safety and reduce the accident rate. This invention proposes a five-proof sound and light alarm device for switch cabinets.

[0005] A five-proof audible and visual alarm device for switchgear includes a power supply unit, a status indication unit, an audio alarm unit, and a light alarm unit; characterized in that...

[0006] The power supply unit outputs low-voltage DC power to provide operating voltage for the status indicator unit, audio alarm unit, and light alarm unit;

[0007] The audio warning unit and the light warning unit work together.

[0008] The luminous warning unit includes several parallel detection branches. Each detection branch corresponds to a working compartment in the switch cabinet and is equipped with an indicator light. When the door of the energized working compartment is opened, the indicator light illuminates as a warning; at the same time, it triggers the audio warning unit to emit an audio warning.

[0009] The beneficial effects of this invention are:

[0010] Compared to existing technologies, the circuit design of this invention consists of an integrated circuit composed of multiple independent triggering circuits and interval reminder lights. Multiple parallel circuits, or "OR" circuits, trigger the alarm bell and flashing lights, achieving centralized control of the alarm device. When the equipment is accidentally entered into an area where operation is not permitted, an alarm sound and warning lights will alert the user, improving equipment safety and reducing the accident rate. Attached Figure Description

[0011] Figure 1 shows the circuit diagram of the alarm device.

[0012] In the diagram: 1. Power switch; 2. Rectifier circuit; 3. Resistor; 4. Working indicator light; 5. Audio switch; 6. Speaker; 7. Relay (coil); 8. Position detection switch; 9. Switch cabinet auxiliary contact; 10. Signal light. Detailed Implementation

[0013] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0014] As shown in Figure 1,

[0015] The alarm device includes a power supply unit, a status indicator unit, an audio alarm unit, and an luminous alarm unit.

[0016] The power supply unit includes a transformer, a bridge rectifier circuit 2, and an RC filter circuit. The input of the power supply unit is high-voltage AC power, which is rectified and filtered by the power supply unit to output low-voltage DC power, providing operating voltage for the status indicator unit, audio alarm unit, and light alarm unit.

[0017] A power switch 1 is installed on the input line of the power supply unit. The opening or closing of switch 1 is used to control the alarm device to be activated or deactivated. Switch 1 can be a manual switch, operated manually by the operator.

[0018] Switch 1 can also use auxiliary contacts from the switchgear circuit, such as normally open auxiliary contacts of relays or normally open auxiliary contacts of contactors in the switchgear circuit. When the switchgear is powered on, the coil of its relay or contactor is energized, and the normally open auxiliary contacts of the relay or contactor close, thereby connecting the input high-voltage AC power to the power supply unit. By using auxiliary contacts from the switchgear circuit, the alarm device can be automatically powered on and activated simultaneously when the switchgear is powered on.

[0019] The status indicator unit includes a resistor 3 and a working indicator light 4, which are connected in series between the positive and negative terminals of the power supply unit's output. When the power supply unit outputs low-voltage DC power, the working indicator light 4 illuminates to indicate that the alarm device has entered the activated state. Additionally, when switch 1 uses auxiliary contacts in the switch cabinet circuit, the switch cabinet is powered on, and the alarm device automatically powers on and starts simultaneously. The working indicator light 4 also indicates that the switch cabinet is in a energized operating state. Therefore, the working indicator light 4 serves as a primary warning light. If personnel find that the working indicator light 4 is illuminated, they should avoid or stop opening the switch cabinet door.

[0020] The audio warning unit and the light warning unit work together.

[0021] The audio alarm unit includes an audio switch 5, a speaker 6, and a relay 7.

[0022] Audio switch 5 and speaker 6 are connected in series between the positive and negative terminals of the power supply unit output. Audio switch 5 is the normally open contact corresponding to relay 7. Relay 7 and the illuminated warning unit are connected in series between the positive and negative terminals of the power supply unit output.

[0023] The luminous warning unit includes several parallel detection branches, each of which is connected in series with a position detection switch (magnetic switch) 8, a switch cabinet auxiliary contact 9, and an indicator light 10.

[0024] That is, the positive terminal of the power supply unit output is first input to the coil of relay 7, and the coil output of relay 7 is connected to each detection branch in the light-emitting warning unit.

[0025] Each detection branch corresponds to a working bay in the switchgear. The auxiliary contact 9 of the switchgear uses the auxiliary normally open contact of the relay or contactor in the circuit of that working bay. The position detection switch 8 is located near the door of that working bay. The position detection switch 8 is a normally open switch; it is open when the door is closed and can be triggered to close when the door is open. The position detection switch 8 is a magnetic switch.

[0026] When a certain working compartment in the switch cabinet is in a energized working state, its auxiliary contact 9 will be closed, that is, the corresponding detection branch enters the detection working state.

[0027] When personnel accidentally enter a live compartment, the door opens, causing the normally open contact of the magnetic switch 8 to close, thus activating the corresponding detection branch and energizing the signal light 10 as a warning. The signal light 10 can be placed near the door for a direct visual warning to personnel.

[0028] After the detection branch is connected, the relay 7 connected in series with it is energized. The audio switch 5, as the normally open contact of the relay 7, is closed, that is, the audio switch 5 is turned on, and the speaker 6 is energized to emit an audio warning.

[0029] The parallel detection branches in the luminous warning unit can perform door detection and luminous warning for each working interval in the switch cabinet. When the luminous warning is triggered by mistakenly entering any energized working interval, an audio warning will also be triggered.

[0030] Once personnel stop entering and close the accidentally opened cabinet door, the magnetic switch 8 reopens, the corresponding detection circuit disconnects, the indicator light 10 goes out, the relay 7 is de-energized, the audio switch 5 disconnects, and the speaker 6 stops emitting an audio warning. The alarm device then returns to a standby state.

[0031] In practical applications

[0032] 1. The alarm device can be manually or automatically activated via switch 1. When activated automatically, the alarm device can operate synchronously with the power-on of the switch cabinet.

[0033] 2. Personnel can make a preliminary judgment on the power-on and operation status of the switchgear by looking at the work indicator light 4.

[0034] 3. When personnel open the work compartment cabinet door, if a live work compartment is accidentally opened, a corresponding light alarm will be triggered, along with an audio alarm. This reminds the operator that they have entered the wrong compartment and need to recheck the compartment.

[0035] When the working interval is opened for power outage maintenance, the auxiliary contact 9 of the switchgear is in the open state and will not trigger an alarm, thus allowing normal operation and maintenance.

[0036] 4. If the light alarm is triggered by accidental entry, personnel must stop entering and close the cabinet door to stop the light and audio alarms.

[0037] Finally, it should be noted that the above description is merely an explanation of the present invention and is not intended to limit the invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A five-proof audible and visual alarm device for switchgear, comprising a power supply unit, a status indication unit, an audio alarm unit, and a light alarm unit; characterized in that, The power supply unit outputs low-voltage DC power to provide operating voltage for the status indicator unit, audio alarm unit, and light alarm unit; The audio warning unit and the light warning unit work together. The luminous warning unit includes several parallel detection branches. Each detection branch corresponds to a working compartment in the switch cabinet and is equipped with an indicator light. When the door of the energized working compartment is opened, the indicator light illuminates as a warning; at the same time, it triggers the audio warning unit to emit an audio warning.

2. The switch cabinet five-prevention sound-light alarm device according to claim 1, characterized in that, The audio warning unit includes an audio switch, a speaker, and a relay; the audio switch and speaker are connected in series between the positive and negative terminals of the power supply unit output; the audio switch is the normally open contact of the relay, and the relay and the light warning unit are connected in series between the positive and negative terminals of the power supply unit output.

3. The switch cabinet five-prevention sound-light alarm device according to claim 2, characterized in that, Each detection branch is equipped with a position detection switch, a switch cabinet auxiliary contact, and an indicator light connected in series.

4. The five-prevention sound-light alarm device of the switch cabinet according to claim 3, characterized in that, The auxiliary contacts of the switchgear adopt the normally open auxiliary contacts in the circuit of the corresponding working interval. When the working interval in the switchgear is in a energized working state, its auxiliary contacts are closed. The position detection switch is located near the door of the working interval. The position detection switch is a normally open switch, which can be triggered to close when the door is opened.

5. The switch cabinet five-prevention sound-light alarm device according to claim 4, characterized in that, The position detection switch uses a magnetic switch.

6. The switch cabinet five-prevention sound-light alarm device according to claim 3, characterized in that, When a detection branch is activated and the indicator light illuminates as a warning, the relay is energized, the audio switch closes, and the speaker emits an audio warning.

7. The switch cabinet five-prevention sound-light alarm device according to claim 1, characterized in that, The status indicator unit includes a resistor and a working indicator light, which are connected in series between the positive and negative terminals of the power supply unit output.

8. The switch cabinet five-prevention audible and visual alarm device according to claim 7, characterized in that, A power switch is installed on the input line of the power supply unit. The power switch can be a manual switch or an auxiliary contact in the switch cabinet circuit.

9. The switch cabinet five-prevention audible and visual alarm device according to claim 8, characterized in that, When the power switch uses the auxiliary contacts in the switch cabinet circuit, the working indicator light acts as a primary warning light to indicate that the switch cabinet is energized.

10. The switch cabinet five-prevention sound-light alarm device according to claim 1, characterized in that, The power supply unit includes a transformer, a bridge rectifier circuit, and a filter circuit. The input of the power supply unit is high-voltage AC, which is rectified and filtered by the power supply unit to output low-voltage DC.

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