Working state checking circuit of explosion-proof electrical equipment

Abstract

The utility model discloses a working state checking circuit of explosion-proof electrical equipment. The working state checking circuit comprises a plurality of state detection circuits, a display and a backup intrinsic safety battery, two ends of each electronic component in the explosion-proof electrical equipment are respectively connected to a detection point of one state detection circuit; the state detection circuit is used for detecting and outputting the voltage of an electronic element or outputting a voltage value under a self fault; the output end of the state detection circuit is connected with the display; the display is arranged on a shell of the explosion-proof electrical equipment; and the state detection loop is respectively connected with alternating current and the backup intrinsic safety battery. According to the invention, a maintainer can determine a fault point on site according to the schematic circuit diagram and the measured and recorded voltage value of the electronic component on site, maintenance is carried out in time, the equipment fault maintenance time is shortened, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of explosion-proof electrical explosion-proof, in particular to a kind of fault detection circuit of explosion-proof electrical equipment. BACKGROUND

[0002] At present, when the normal work and failure of internal circuit of explosion-proof electrical equipment occur, because of the special operating environment of explosion-proof equipment, internal circuit is installed in explosion-proof shell, according to the requirement of explosion-proof, must be powered off to open the door or cover plate of explosion-proof electrical equipment, and opening the door or cover plate of explosion-proof electrical equipment under electricity will cause explosion of explosion-proof electrical equipment, can cause combustible material explosion, also can cause electric shock accident occurs.So in the case of power failure, many tests, debugging cannot be completed on site, and it is not convenient to test and inspect, increases the equipment failure maintenance judgment time, reduces production efficiency. SUMMARY

[0003] Therefore, in view of the above technical problems, a working state viewing circuit of explosion-proof electrical equipment is provided to solve the problem that detection cannot be carried out on site when explosion-proof electrical equipment is powered off, and increase the equipment failure maintenance judgment time.

[0004] In a first aspect, a working state viewing circuit of explosion-proof electrical equipment, the circuit comprises: a plurality of state detection circuits, a display, a backup intrinsically safe battery;

[0005] Both ends of each electronic component inside the explosion-proof electrical equipment are connected to the detection point of a state detection circuit;The state detection circuit is used to detect and output the voltage of the electronic component or output the voltage under its own failure;

[0006] The output end of the state detection circuit is connected with the display, and the display is arranged on the shell of the explosion-proof electrical equipment;

[0007] The state detection circuit is connected with alternating current and the backup intrinsically safe battery.

[0008] In the above scheme, optionally, the state detection circuit is also connected with the control platform.

[0009] In the above scheme, further optionally, the state detection circuit is connected with the control platform through 485MODBUS network and 5G.

[0010] In the above scheme, optionally, the state detection circuit comprises: fuse F1, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6;Diode D1, diode D2, diode D3, diode D4, triode Q1, capacitor C1, optocoupler U1, switch S1, backup intrinsically safe battery V1.

[0011] One end of the F1 is connected with the resistor R5 and one end of the resistor R6 in turn, the other end of the F1 and the other end of the resistor R6 are detection points; one end of the diode D1 is connected on the connecting line of the resistor R5 and the resistor R6, the other end is connected with the base of the triode Q1 through the resistor R3; the collector of the triode Q1 is connected with one end of the backup intrinsically safe battery V1 through the resistor R2 and the switch S1; one end of the resistor R4 is connected on the connecting line of the resistor R2 and the switch S1, the other end is connected on the connecting line of the resistor R3 and the base of the triode Q1; the emitter of the triode Q1 is connected with the other end of the resistor R6 through the resistor R1; one end of the capacitor C1 is connected on the connecting line of the resistor R3 and the base of the triode Q1, the other end is connected on the connecting line of the emitter of the triode Q1 and the resistor R1; the other end of the backup intrinsically safe battery V1 is connected on the connecting line of the resistor R1 and the resistor R6; one end of the diode D2 is connected on the connecting line of the diode D1 and the resistor R3, the other end is connected with the backup intrinsically safe battery V1; a node is set on the connecting line of the emitter of the triode Q1 and the resistor R1, a first branch is led out, the first branch is connected with one end of the CPU; a node is set on the connecting line of the resistor R1 and the resistor R6, a second branch is led out, the second branch is connected with the other end of the CPU; the anode of the diode D3 and the diode D4 are connected on the second branch respectively, the cathode are connected on the first branch respectively.

[0012] In the above scheme, optionally, the resistor

[0013] Wherein, V is the normal working voltage of the element to be measured.

[0014] In the above scheme, optionally, the rated current of the fuse F1 is 0.5 AMP.

[0015] In the above scheme, optionally, the alternating current is connected with the backup intrinsically safe battery through the isolation output module, and the backup intrinsically safe battery is connected with the state detection loop through the isolation input output module.

[0016] The application has at least the following beneficial effects:

[0017] The application connects the state detection circuit at both ends of each electronic component inside the explosion-proof electrical equipment, simultaneously connects the backup intrinsic safety battery with the state detection circuit, ensures that the state detection circuit can still detect the voltage value of the electronic component under power-off condition, and detects the different value under self-failure with the electronic component, connects the state detection circuit with the display arranged on the explosion-proof electrical shell, thereby, the voltage value of multiple electronic components or the voltage value under state detection circuit failure can be displayed, thereby, the maintenance personnel can determine the failure point on site according to the circuit schematic diagram and the measured voltage value of the electronic component, timely maintenance is performed, the equipment failure maintenance time is reduced, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A circuit structure diagram of a working state viewing circuit of an explosion-proof electrical equipment provided by an embodiment of the application is provided;

[0019] Figure 2 A circuit principle diagram of a state detection circuit provided by an embodiment of the application is provided;

[0020] Figure 3 A connection schematic diagram of a backup intrinsic safety battery, an isolation output module and a state detection circuit provided by an embodiment of the application is provided;

[0021] Figure 4 A setting schematic diagram of a display of an explosion-proof electrical equipment provided by an embodiment of the application is provided. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the application more clear, the application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.

[0023] In one embodiment, as shown in Figure 1 , a working state viewing circuit of an explosion-proof electrical equipment is provided, the circuit comprising: multiple state detection circuits, a display, a backup intrinsic safety battery;

[0024] Both ends of each electronic component inside the explosion-proof electrical equipment are respectively connected to the detection points of a state detection circuit; the state detection circuit is used for detecting and outputting the voltage of the electronic component, or outputting the voltage under self-failure;

[0025] The output end of the state detection circuit is connected with the display; the display is arranged on the shell of the explosion-proof electrical equipment;

[0026] The state detection circuit is respectively connected with alternating current and the backup intrinsic safety battery.

[0027] In this embodiment, a closed-loop protection device is composed of a mechanical state and potential state sampling circuit including a detection point, a display, and an intrinsically safe power supply circuit. The mechanical state sampling circuit collects the mechanical state of the detection point by using the normally open contact of the contactor to determine whether the mechanical part of the contactor is in action. The purpose is to analyze the failure of the contactor due to the sticking of the contact in the fault state, which is always in the connected state. According to the analysis of the data based on the device arrangement, the safety usage rate of the device is improved, and the judgment time for device failure maintenance is reduced, providing accurate fault points and damaged component models for maintenance personnel, and improving production efficiency. The device has a configuration display function, which can display the voltage values of each electronic component, so that the running state and accurate fault points and damaged component models can be accurately known according to the circuit principle. The device has a communication function, which can stop the power supply of the upper level and sound and light alarm to ensure safety in the case of illegal intrusion and abnormal state of the device. The device has a storage function to record the operation of the device.

[0028] At the same time, when setting the state detection circuit, it can be set according to the actual circuit structure as needed, such as setting the state detection circuit of the electronic component that can complete the fault point determination at a minimum limit. In fact, it is not necessary to set every electronic component.

[0029] In the above working state viewing circuit of the explosion-proof electrical equipment, the state detection circuit is connected at both ends of each electronic component inside the explosion-proof electrical equipment, and the backup intrinsically safe battery is connected with the state detection circuit, so that the state detection circuit can still detect the voltage value of the electronic component in the case of power failure, and the detection value is different from that of the electronic component in the case of its own failure. The state detection circuit is connected with the display arranged on the explosion-proof electrical shell, so that the voltage values of multiple electronic components or the voltage values in the case of state detection circuit failure can be displayed. Therefore, the maintenance personnel can determine the fault point on site according to the circuit principle diagram and the measured voltage value of the electronic component, and timely maintenance is performed, which reduces the device failure maintenance time and improves the production efficiency.

[0030] In one embodiment, the state detection circuit is also connected with the control platform.

[0031] In one embodiment, the state detection circuit is also connected with the control platform through 485 MODBU network and 5G, respectively.

[0032] In this embodiment, after the explosion-proof electrical equipment fails, the voltage value collected by the state detection circuit is uploaded to the upper device and the dispatching command center (control platform) through communication (485 MODBU network or 5G), and is recorded and saved in the control platform.

[0033] In one embodiment, as Figure 2As shown, the state detection circuit comprises: a safety tube F1, resistors R1, R2, R3, R4, R5, R6; diodes D1, D2, D3, D4, a triode Q1, a capacitor C1, a photoelectric coupler U1, a switch S1, and a backup intrinsically safe battery V1.

[0034] One end of the F1 is connected to one end of the resistor R5 and the resistor R6 in sequence, and the other end of the F1 and the other end of the resistor R6 are detection points; one end of the diode D1 is connected to the connecting line of the resistor R5 and the resistor R6, and the other end is connected to the base of the triode Q1 through the resistor R3; the collector of the triode Q1 is connected to one end of the backup intrinsically safe battery V1 through the resistor R2 and the switch S1; one end of the resistor R4 is connected to the connecting line of the resistor R2 and the switch S1, and the other end is connected to the connecting line of the resistor R3 and the base of the triode Q1; the emitter of the triode Q1 is connected to the other end of the resistor R6 through the resistor R1; one end of the capacitor C1 is connected to the connecting line of the resistor R3 and the base of the triode Q1, and the other end is connected to the connecting line of the emitter of the triode Q1 and the resistor R1; the other end of the backup intrinsically safe battery V1 is connected to the connecting line of the resistor R1 and the resistor R6; one end of the diode D2 is connected to the connecting line of the diode D1 and the resistor R3, and the other end is connected to the backup intrinsically safe battery V1; a node is arranged on the connecting line of the emitter of the triode Q1 and the resistor R1 to lead out a first branch, and the first branch is connected to one end of a CPU; a node is arranged on the connecting line of the resistor R1 and the resistor R6 to lead out a second branch, and the second branch is connected to the other end of the CPU; the anodes of the diodes D3 and D4 are respectively connected to the second branch, and the cathodes are respectively connected to the first branch.

[0035] In this embodiment, an amplification circuit and a voltage division matching circuit are used before the photoelectric coupling, so that the sampling voltage range is larger, the sampling current is smaller, about 5 to 10 microamperes, the influence on the detected circuit is smaller, and it is more accurate, and theoretically the resolution can reach 4096 levels, so that the collection and judgment of the CPU can more accurately reflect the real state of the equipment and judge the fault, and will not cause misoperation.

[0036] As shown in Figure 2 The detection point a and the detection point b are arranged at two ends of the electronic device. Figure 2The left circuit of the explosion-proof electrical equipment is part of the internal circuit. If the detection points a and b of the state detection circuit are connected to the two ends of the switch KJ1 in the explosion-proof electrical equipment, the detection points 3 and 5, it can be known that when the kj1 contact is closed, the detection points a and b are at the same potential, and when the kj1 contact is opened, the control transformer enters the r5, r6 resistance divider circuit connected to the positive pole of d1 through D2 zener diode to r3 to control q1 triode. After the triode is turned on, the control voltage is formed on the resistor r1, and is connected to the U1 photoelectric coupler 1 pin 2 pin, the 3 pin 4 pin of the U1 is output to the CPU, thereby forming the closed loop control circuit of r5 and r6 voltage division, d1 rectification, q1 amplification, and U1 isolation to the CPU. Therefore, the state detection of the two sides of kj1 may appear four states:

[0037] The first is that the internal circuit of the explosion-proof electrical equipment is normal, KJ1 is closed, the detection points a and b are at the same potential, and the positive pole of d1 has no input. The q1 is controlled by the r4 resistor value to generate a detection value 1 of the linear photoelectric coupler u1.

[0038] The second is that the internal circuit of the explosion-proof electrical equipment is normal, KJ1 is opened, the control voltage is connected to the positive pole of d1 through the r5, r6 resistance divider circuit connected to the positive pole of d1 through D2 zener diode to r3 to control q1 triode. After the triode is turned on, the control voltage is formed on the resistor r1, and the linear photoelectric coupler u1 generates a detection value 2.

[0039] The third is that if there is a damaged electronic component in the internal circuit of the explosion-proof electrical equipment, the voltage value detected by the detection points a and b deviates from the normal range, causing the u1 to change the conduction state and form a detection value 3.

[0040] The fourth is that if there is a damaged electronic component in the internal circuit of the explosion-proof electrical equipment, the voltage value detected by the detection points a and b deviates from the normal range, causing the u1 to change the conduction state and form a detection value 4.

[0041] That is, when the electronic components of the explosion-proof electrical equipment are normal and damaged, the state detection circuit outputs different values. Therefore, the state detection circuit is connected to the detection points 3 and 4, 4 and 5 to detect the voltage of the two ends of L2, F3 and KJ, and the complete operation state data of the equipment is obtained. According to the voltage values of the electronic components of each loop in the explosion-proof electrical equipment collected by the state detection circuit, and according to the sampling data of the upper and lower levels of the circuit elements in the circuit principle, the fault point can be located. Moreover, not only the target equipment can be detected, but also the detection equipment itself can be monitored.

[0042] As shown in Table 1, Figure 1The left side of the explosion-proof electrical equipment internal circuit, the measured value of each state detection circuit, the corresponding fault condition of the explosion-proof electrical equipment:

[0043] Table 1

[0044]

[0045] In one embodiment, the

[0046]

[0047] Wherein, V is the normal working voltage of the element to be measured.

[0048] In one embodiment, the rated current of the fuse F1 is 0.5 AMP.

[0049] In one embodiment, the AC power is connected to the backup intrinsic safety battery through an isolation output module, and the backup intrinsic safety battery is connected to the state detection circuit through an isolation input output module.

[0050] The voltage value of the electronic element is displayed by graphics and text, with sleep power saving and wake-up functions. The high resistance state sampling circuit is used for the closing and opening intrinsic safety circuit, which reduces the impact on the equipment. The safety detection circuit with fast sparkless fuse is used for the power type potential detection point. The electrically erasable memory is used to record the equipment running state, the winding type data arrangement, and the information data can be backed up to the superior management center. After the equipment runs for several years, the earliest information data is automatically covered.

[0051] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0052] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. A circuit for monitoring the operating status of explosion-proof electrical equipment, characterized in that, The circuit comprises a plurality of state detection circuits, a display, and a backup intrinsically safe battery. Two ends of each electronic component inside the explosion-proof electrical equipment are respectively connected to a detection point of a state detection circuit, which is used to detect and output the voltage of the electronic component or output the voltage under its own failure. An output end of the state detection circuit is connected to the display, which is arranged on the shell of the explosion-proof electrical equipment. The state detection circuit is respectively connected to an alternating current and the backup intrinsically safe battery.

2. The working status viewing circuit of an explosion-proof electrical apparatus according to claim 1, characterized by The state detection circuit is further connected to a control platform.

3. The working status viewing circuit of an explosion-proof electrical apparatus according to claim 2, characterized in that, The state detection circuit is further connected to the control platform through a 485 MODBUS network and 5G.

4. The working status viewing circuit of an explosion-proof electrical apparatus according to claim 1, characterized by The state detection circuit comprises a fuse F1, resistors R1, R2, R3, R4, R5, R6, diodes D1, D2, D3, D4, a triode Q1, a capacitor C1, an optical coupler U1, a switch S1, and a backup intrinsically safe battery V1. One end of the F1 is connected to one end of the resistor R5 and the resistor R6 in sequence, and the other end of the F1 and the other end of the resistor R6 are detection points. One end of the diode D1 is connected to the connecting line of the resistor R5 and the resistor R6, and the other end thereof is connected to the base of the triode Q1 through the resistor R3. The collector of the triode Q1 is connected to one end of the backup intrinsically safe battery V1 through the resistor R2 and the switch S1. One end of the resistor R4 is connected to the connecting line of the resistor R2 and the switch S1, and the other end thereof is connected to the connecting line of the resistor R3 and the base of the triode Q1. The emitter of the triode Q1 is connected to the other end of the resistor R6 through the resistor R1. One end of the capacitor C1 is connected to the connecting line of the resistor R3 and the base of the triode Q1, and the other end thereof is connected to the connecting line of the emitter of the triode Q1 and the resistor R1. The other end of the backup intrinsically safe battery V1 is connected to the connecting line of the resistor R1 and the resistor R6. One end of the diode D2 is connected to the connecting line of the diode D1 and the resistor R3, and the other end thereof is connected to the backup intrinsically safe battery V1. A node is arranged on the connecting line of the emitter of the triode Q1 and the resistor R1 to lead out a first branch, and the first branch is connected to one end of a CPU. A node is arranged on the connecting line of the resistor R1 and the resistor R6 to lead out a second branch, and the second branch is connected to the other end of the CPU. The anodes of the diodes D3 and D4 are respectively connected to the second branch, and the cathodes thereof are respectively connected to the first branch.

5. The working status viewing circuit of an explosion-proof electrical apparatus according to claim 4, characterized in that, The V is the normal working voltage of the to-be-detected element.

6. The working status viewing circuit of an explosion-proof electrical apparatus according to claim 4, characterized by The fuse F1 has a rated current of 0.5 AMP.

7. The working status viewing circuit of an explosion-proof electrical apparatus according to claim 1, characterized by The alternating current is connected to the backup intrinsically safe battery through an isolation output module, and the backup intrinsically safe battery is connected to the state detection circuit through an isolation input / output module.

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