Five-prevention sound-light alarm device of switch cabinet

Abstract

A five-prevention sound-light alarm device for a switch cabinet comprises a power supply unit, a state indication unit, an audio warning unit and a light-emitting warning unit. The power supply unit outputs low-voltage direct current and provides working voltage for the state indication unit, the audio warning unit and the light-emitting warning unit; the audio warning unit and the light-emitting warning unit work cooperatively; the light-emitting warning unit comprises a plurality of parallel detection branches, each detection branch corresponds to a working interval in the switch cabinet and is provided with a signal lamp, and when a cabinet door of the live working interval is opened, the signal lamp emits light for warning; meanwhile, the audio warning unit is triggered to give out an audio warning; when the equipment is not allowed to operate and enters the electrified interval by mistake, the alarm sound and the alarm lamp can remind, so that the safety of the equipment can be improved, and the accident rate can be reduced.

Description

Technical Field

[0001] The invention relates to the field of switch cabinets, in particular to a five-protection sound and light alarm device for a switch cabinet. Background Art

[0002] The "five protections" of electrical equipment refer to: preventing the circuit breaker from opening and closing by mistake, preventing the disconnector from opening and closing with load, preventing the grounding wire (grounding switch) from being hung (closed) with power on, preventing power from being supplied with the grounding wire, and preventing the operator from mistakenly entering the live compartment. The existing "five protection" locking devices are all silent mechanical locking devices, which only lock the cabinet door of the circuit breaker and cannot be opened when the equipment is running. There is no other reminder function, and the operator cannot clearly know the correctness of the operating compartment. In addition, the failure rate of the mechanical mechanism is relatively high, and it is not ruled out that the wrong compartment may be entered and the switch cabinet door may be forcibly opened due to a fault.

[0003] Therefore, the "five-prevention" locking device that can trigger the misoperation signal in time is of great significance in the actual production process. Compared with the purely mechanical silent "five-prevention" device, if the equipment does not allow operation, there will be an alarm sound and alarm light to remind you if you mistakenly enter the interval, which will improve the safety of the equipment and reduce the accident rate. Summary of the invention

[0004] The purpose of the present invention is to provide a five-protection sound and light alarm device for a switch cabinet, which can provide a reminder when the device mistakenly enters a compartment when the device is not allowed to operate, thereby improving the safety of the device and reducing the accident rate.

[0005] A switch cabinet five-protection sound and light alarm device, comprising a power supply unit, a status indication unit, an audio warning unit and a light-emitting warning unit; characterized in that:

[0006] The power supply unit outputs low voltage direct current to provide working voltage for the status indication unit, the audio warning unit and the light emitting warning unit;

[0007] The audio warning unit and the luminous warning unit work in coordination;

[0008] The luminous warning unit includes several parallel detection branches, each detection branch corresponds to a working compartment in the switch cabinet and is provided with a signal light. When the cabinet door of the energized working compartment is opened, the signal light emits a warning; at the same time, the audio warning unit is triggered to issue an audio warning.

[0009] The beneficial effects of the present invention are:

[0010] Compared with the prior art, the circuit design of the present invention is an integrated circuit composed of multiple independent trigger circuits and interval reminder lights, which rely on multiple parallel circuits or "OR" circuits to trigger alarm bells and flashing lights to complete the centralized control of the alarm device. When the equipment enters the interval by mistake without allowing operation, there will be an alarm sound and alarm light to remind, which will improve the safety of the equipment and reduce the accident rate. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0012] In the figure: 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 DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] like Figure 1 As shown,

[0015] The alarm device comprises a power supply unit, a state indicating unit, an audio warning unit and a luminous warning unit.

[0016] The power supply unit has a transformer, a bridge rectifier circuit 2 and an RC filter circuit. The input end of the power supply unit is high voltage AC, which is rectified and filtered by the power supply unit to output low voltage DC to provide working voltage for the status indication unit, the audio warning unit and the light warning unit.

[0017] A power switch 1 is provided on the input end line of the power supply unit, and the opening or closing of the switch 1 is used to control the operation or closing of the alarm device. The switch 1 can be a manual switch, which is manually operated by the staff.

[0018] The switch 1 may also use auxiliary contacts in the switch cabinet circuit, such as relay auxiliary normally open contacts or contactor normally open auxiliary contacts in the switch cabinet circuit. When the switch cabinet is powered on, the coil of its relay or contactor is energized, and the relay auxiliary normally open contacts or contactor normally open auxiliary contacts are closed, thereby connecting the input high voltage AC of the power supply unit. By using the auxiliary contacts in the switch cabinet circuit, when the switch cabinet is powered on, the alarm device can be automatically powered on and started at the same time.

[0019] The status indication unit includes a resistor 3 and a working indicator light 4, which are connected in series between the positive and negative electrodes of the output end of the power supply unit. When the power supply unit outputs low-voltage direct current, the working indicator light 4 can light up to indicate that the alarm device enters the start-up state. In addition, when the switch 1 uses the auxiliary contacts in the switch cabinet circuit, the switch cabinet is powered on, and the alarm device is automatically powered on and started at the same time. The working indicator light 4 also indicates that the switch cabinet is in the energized operation state at this time, so that the working indicator light 4 can be used as a first-level warning light. If the personnel find that the working indicator light 4 is in the light-emitting state, they should avoid or stop opening the cabinet door of the switch cabinet.

[0020] The audio warning unit and the light emitting warning unit both work in coordination.

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

[0022] The audio switch 5 and the speaker 6 are connected in series between the positive and negative electrodes of the output terminal of the power supply unit. The audio switch 5 is a normally open contact corresponding to the relay 7. The relay 7 and the light-emitting warning unit are connected in series between the positive and negative electrodes of the output terminal of the power supply unit.

[0023] The luminous warning unit comprises a plurality of parallel detection branches, each of which is provided with a position detection switch (magnetic switch) 8, a switch cabinet auxiliary contact 9, and a signal lamp 10 in series.

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

[0025] Each detection branch corresponds to a working interval in the switch cabinet. The auxiliary contact 9 of the switch cabinet adopts the auxiliary normally open contact of the relay or contactor in the circuit of the working interval. The position detection switch 8 is set near the door body of the working interval. The position detection switch 8 is a normally open switch. When the door body is closed, the position detection switch 8 is in an open state. When the door body is opened, the position detection switch 8 can be triggered to close. The position detection switch 8 adopts a magnetically controlled switch.

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

[0027] When a person enters the live compartment by mistake, the door opens, causing the normally open contact of the magnetic switch 8 to close, thereby connecting the corresponding detection branch, and the signal light 10 is energized to emit light for warning. The signal light 10 can be set near the door, so that the person can be warned visually.

[0028] After the detection branch is turned on, the relay 7 connected in series therewith is energized, and 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] Several parallel detection branches in the luminous warning unit can perform door detection and luminous warning on each working compartment in the switch cabinet, and when the luminous warning is triggered by mistakenly entering any energized working compartment, an audio warning will be further triggered at the same time.

[0030] When the personnel stops entering and closes the accidentally opened cabinet door, the magnetic switch 8 is reopened, the corresponding detection branch is disconnected, the signal light 10 is extinguished, and at the same time the relay 7 loses power, the audio switch 5 is disconnected, and the speaker 6 no longer issues an audio warning. The alarm device is in the waiting state again.

[0031] In specific applications,

[0032] 1. Start the alarm device manually or automatically through switch 1. When started automatically, the alarm device can be synchronized with the power-on of the switch cabinet.

[0033] 2. Personnel can preliminarily judge the power-on operating status of the switch cabinet through the working indicator light 4.

[0034] 3. When a person opens the door of a working compartment, if he opens the live working compartment by mistake, the corresponding light alarm will be triggered, and the audio alarm will be triggered at the same time, reminding the operator that he has walked into the wrong compartment and needs to recheck the compartment.

[0035] When the working interval is opened for power outage maintenance, the auxiliary contact 9 of the switch cabinet is in disconnected state and will not trigger an alarm, so normal operation and maintenance can be carried out.

[0036] 4. When the luminous alarm is triggered by mistaken entry, the person must stop entering and close the cabinet door to stop the luminous alarm and audio alarm.

[0037] Finally, it should be noted that the above description is only an explanation of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail, those skilled in the art can still modify the technical solutions described above or replace some of the technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A switch cabinet five-protection sound and light alarm device, comprising a power supply unit, a status indication unit, an audio warning unit and a light-emitting warning unit; characterized in that: The power supply unit outputs low voltage direct current to provide working voltage for the status indication unit, the audio warning unit and the light emitting warning unit; The audio warning unit and the luminous warning unit work in coordination; The luminous warning unit includes several parallel detection branches, each detection branch corresponds to a working compartment in the switch cabinet and is provided with a signal light. When the cabinet door of the energized working compartment is opened, the signal light emits a warning; at the same time, the audio warning unit is triggered to issue an audio warning.

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

3. According to claim 2, a switch cabinet five-protection sound and light alarm device is characterized in that: Each detection branch is provided with a position detection switch, a switch cabinet auxiliary contact and a signal lamp in series.

4. A switch cabinet five-protection sound and light alarm device according to claim 3, characterized in that: The auxiliary contacts of the switch cabinet adopt the auxiliary normally open contacts in the circuit of the corresponding working interval. When the working interval in the switch cabinet is in the energized working state, the auxiliary contacts of the switch cabinet are closed; The position detection switch is arranged near the door body of the working interval. The position detection switch is a normally open switch. When the door body is opened, the position detection switch can be triggered to close.

5. A switch cabinet five-protection sound and light alarm device according to claim 4, characterized in that: The position detection switch adopts a magnetic control switch.

6. A switch cabinet five-protection sound and light alarm device according to claim 3, characterized in that: When a detection branch is turned on and the signal light is turned on to warn, the relay is energized, and the speaker emits an audio warning after the audio switch is closed.

7. A switch cabinet five-protection sound and light alarm device according to claim 1, characterized in that: The status indicating unit comprises a resistor and a working indicator light, and the resistor and the working indicator light are connected in series between the positive and negative electrodes of the output end of the power supply unit.

8. A switch cabinet five-protection sound and light alarm device according to claim 7, characterized in that: A power switch is provided on the input end circuit of the power supply unit, and the power switch adopts a manual switch or an auxiliary contact in the switch cabinet circuit.

9. A switch cabinet five-protection sound and light 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 serves as a primary warning light to indicate that the switch cabinet is energized.

10. A switch cabinet five-protection sound and light alarm device according to claim 1, characterized in that: The power supply unit has a transformer, a bridge rectifier circuit and a filter circuit. The input end 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.

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