Working state checking circuit of explosion-proof electrical equipment

Abstract

The invention 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 equipment, and in particular to a fault detection circuit for explosion-proof electrical equipment. Background Art

[0002] At present, due to the special operating environment of explosion-proof equipment, the internal circuit is installed in the explosion-proof shell. According to the explosion-proof requirements, the door or cover of the explosion-proof electrical equipment can only be opened after the power is turned off. Opening the door or cover of the explosion-proof electrical equipment with power on will cause the explosion of the explosion-proof electrical equipment, which will cause the explosion of combustible materials and electric shock accidents. In the case of power outage, many tests and debugging cannot be completed on site, and it is not convenient to test and inspect, which increases the time for equipment failure repair judgment and reduces production efficiency. Summary of the invention

[0003] Based on this, in order to solve the above technical problems, a circuit for checking the working status of explosion-proof electrical equipment is provided to solve the problem that when the explosion-proof electrical equipment is powered off, detection cannot be performed on site, which increases the time for judging equipment fault maintenance.

[0004] In a first aspect, a circuit for checking the working status of explosion-proof electrical equipment is provided, the circuit comprising: a plurality of status detection circuits, a display, and a backup intrinsically safe battery;

[0005] 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 to detect and output the voltage of the electronic component, or output the voltage under its own fault;

[0006] The output end of the state detection circuit is connected to a display; the display is arranged on the housing of the explosion-proof electrical equipment;

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

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

[0009] In the above scheme, further optionally, the status detection circuit is also connected to the control platform via the 485MODBUS network and 5G respectively.

[0010] In the above scheme, optionally, the state detection circuit includes: a fuse F1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a resistor R6; a diode D1, a diode D2, a diode D3, a diode D4, a transistor Q1, a capacitor C1, a photocoupler U1, a switch S1, and a backup intrinsically safe battery V1;

[0011] 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 connection line between the resistor R5 and the resistor R6, and the other end is connected to the base of the transistor Q1 through the resistor R3; the collector of the transistor 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 connection line between the resistor R2 and the switch S1, and the other end is connected to the connection line between the resistor R3 and the base of the transistor Q1; the emitter of the transistor 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 connection line between the resistor R3 and the base of the transistor Q1 , and the other end is connected to the connection line between the emitter of the transistor Q1 and the resistor R1; the other end of the backup intrinsically safe battery V1 is connected to the connection line between the resistors R1 and R6; one end of the diode D2 is connected to the connection line between the diode D1 and the resistor R3, and the other end is connected to the backup intrinsically safe battery V1; a node is set on the connection line between the emitter of the transistor Q1 and the resistor R1 to lead out a first branch, and the first branch is connected to one end of the CPU; a node is set on the connection line between the resistors R1 and 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.

[0012] In the above scheme, optionally, the

[0013] Where V is the normal operating voltage of the device under test.

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

[0015] In the above solution, optionally, the alternating current is connected to the backup intrinsically safe battery through an isolated output module, and the backup intrinsically safe battery is connected to the status detection circuit through an isolated input and output module.

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

[0017] The present application connects a status detection circuit to both ends of each electronic component inside explosion-proof electrical equipment, and at the same time connects a backup intrinsically safe battery to the status detection circuit, to ensure that the status detection circuit can still detect the voltage value of the electronic component in the event of a power outage, as well as a detection value different from that of the electronic component in the event of a fault in the state detection circuit, and connects the status detection circuit to a display disposed on the explosion-proof electrical housing, thereby displaying the voltage values ​​of multiple electronic components or the voltage values ​​in the event of a status detection circuit fault. As a result, maintenance personnel can determine the fault point on site based on the circuit schematic and the measured voltage value of the electronic component, and perform maintenance in a timely manner, thereby reducing the equipment failure maintenance time and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A circuit structure diagram of a working status viewing circuit of an explosion-proof electrical device provided in one embodiment of the present application;

[0019] Figure 2 A circuit schematic diagram of a state detection circuit provided by one embodiment of the present application;

[0020] Figure 3 A schematic diagram of the connection between a backup intrinsically safe battery, an isolated output module, and a status detection circuit provided in one embodiment of the present application;

[0021] Figure 4 A schematic diagram of the configuration of an explosion-proof electrical equipment display provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

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

[0023] In one embodiment, Figure 1 As shown, a circuit for checking the working status of explosion-proof electrical equipment is provided, the circuit comprising: a plurality of status detection circuits, a display, and a backup intrinsically safe 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 to detect and output the voltage of the electronic component, or output the voltage under its own fault;

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

[0026] The state detection circuit is connected to the alternating current and the backup intrinsically safe battery respectively.

[0027] In this embodiment, a mechanical state and potential state sampling circuit including a detection point, a display, and an intrinsically safe power supply circuit are used to form a closed-loop protection device. The sampling circuit collects the mechanical state of the detection point, which means using the normally open contact of the contactor to determine whether the mechanical part of the contactor is in motion. The purpose is to analyze the failure of the contactor to disconnect due to contact adhesion in a fault state, and it has been in a connected state. According to the equipment layout, the data is analyzed to improve the safe use rate of the equipment and reduce the time for judging equipment failure maintenance, provide maintenance personnel with accurate fault points and damaged component models, and improve production efficiency. The equipment has a configuration display function, which can display the voltage value of each electronic component, so that the operating status and accurate fault points and damaged component models can be accurately known according to the circuit principle. The equipment has a communication function, which can stop the upper power supply and sound and light alarm to ensure safety when the equipment is illegally invaded and in an abnormal state. The equipment has a storage function to record the operation of the equipment.

[0028] Meanwhile, when setting the status detection circuit, it can be set as required according to the actual circuit structure. For example, the status detection circuit can be set on the electronic components that can complete the fault point determination to the minimum extent. In fact, it is not necessary to set it for each electronic component.

[0029] In the working status viewing circuit of the above-mentioned explosion-proof electrical equipment, the status detection circuit is connected to both ends of each electronic component inside the explosion-proof electrical equipment, and at the same time, the backup intrinsically safe battery is connected to the status detection circuit to ensure that the status detection circuit can still detect the voltage value of the electronic component in the case of power failure, as well as the detection value different from the electronic component under its own failure. The status detection circuit is connected to a display arranged on the explosion-proof electrical casing, thereby displaying the voltage values ​​of multiple electronic components or the voltage value under the failure of the status detection circuit. Therefore, the maintenance personnel can determine the fault point on site according to the measured voltage value of the electronic component based on the circuit schematic diagram, and perform maintenance in time, thereby reducing the equipment failure maintenance time and improving production efficiency.

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

[0031] In one embodiment, the status detection circuit is also connected to the control platform via the 485MODBU network and 5G respectively.

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

[0033] In one embodiment, Figure 2As shown, the state detection circuit includes: a fuse F1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a resistor R6; a diode D1, a diode D2, a diode D3, a diode D4, a transistor Q1, a capacitor C1, a photocoupler 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 connection line between the resistor R5 and the resistor R6, and the other end is connected to the base of the transistor Q1 through the resistor R3; the collector of the transistor 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 connection line between the resistor R2 and the switch S1, and the other end is connected to the connection line between the resistor R3 and the base of the transistor Q1; the emitter of the transistor 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 connection line between the resistor R3 and the base of the transistor Q1 , and the other end is connected to the connection line between the emitter of the transistor Q1 and the resistor R1; the other end of the backup intrinsically safe battery V1 is connected to the connection line between the resistors R1 and R6; one end of the diode D2 is connected to the connection line between the diode D1 and the resistor R3, and the other end is connected to the backup intrinsically safe battery V1; a node is set on the connection line between the emitter of the transistor Q1 and the resistor R1 to lead out a first branch, and the first branch is connected to one end of the CPU; a node is set on the connection line between the resistors R1 and 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 amplifier circuit and a voltage divider matching circuit are used before the optocoupler to make the sampling voltage range larger and the sampling current smaller, about 5 to 10 microamperes, with less impact on the detected circuit and more accuracy. Theoretically, the resolution can reach 4096 levels. In this way, after collection and judgment by the CPU, it can more accurately reflect the actual status of the equipment and judge faults without causing malfunctions.

[0036] like Figure 2 As shown, detection point a and detection point b are set at two ends of the electronic device. Figure 2The circuit on the left is part of the internal circuit of the explosion-proof electrical equipment. If the detection points a and b of the state detection circuit are connected to the detection points 3 and 5 of the switch KJ1 inside the explosion-proof electrical equipment for detection, it can be seen that after the contact of KJ1 is closed, the detection point a and the detection point b are at the same potential. When the contact of KJ1 is in the open state, the voltage divider circuit from the control transformer to the KJ coil enters R5 through F1, and the voltage is stabilized by the D2 voltage regulator tube and enters R3 to control the Q1 transistor. After the transistor is turned on, a control voltage is formed on the resistor R1, and it is connected to the 1st and 2nd pins of the U1 optocoupler to control the 3rd and 4th pins of U1 to output to the CPU, thereby forming a closed-loop control circuit of R5 and R6 voltage division, D1 rectification, Q1 amplification, and U1 isolation to the CPU. Therefore, the state detection set on both sides of KJ1 may appear in four states:

[0037] The first is that the internal circuit of the explosion-proof electrical equipment is normal, KJ1 is closed, detection point A and detection point B are at the same potential, there is no input to the positive pole of D1, and Q1 controls the linear optocoupler U1 according to the resistance value of R4 to generate a detection value of 1;

[0038] The second is that the internal circuit of the explosion-proof electrical equipment is normal, KJ1 is opened, and the control voltage is connected to the positive pole of D1 through the coil KJ to the R5 and R6 resistor voltage divider circuit, and then enters R3 to control the Q1 transistor through the D2 voltage regulator tube. After the transistor is turned on, a control voltage is formed on the resistor R1, which controls the linear optocoupler U1 to generate a detection value of 2;

[0039] The third is that if the voltage is reduced due to damage to electronic components in the explosion-proof electrical circuit, the voltage values ​​detected at detection points a and b are out of the normal range, causing the conduction state of u1 to change, forming a detection value of 3;

[0040] The fourth type is that if the voltage rises due to damage of electronic components in the explosion-proof electrical circuit, the voltage values ​​detected at detection points a and b will be out of the normal range, causing the conduction state of u1 to change, resulting in detection value 4.

[0041] That is to say, when the electronic components in the explosion-proof electrical circuit are normal or damaged, the status detection circuit will output different values. Therefore, the status detection circuit is installed at detection point 3 and detection point 4, detection point 4 and detection point 5 to detect the voltage at both ends of L2, F3 and KJ, and obtain the complete operation status data of the equipment. Therefore, according to the voltage values ​​of the electronic components of each circuit inside the explosion-proof electrical equipment collected by the status detection circuit, according to the logic of the circuit principle of the sampling data of the upper and lower levels of the circuit components, the fault point can be located. Moreover, it can not only detect the target equipment, but also monitor the detection circuit of the detection equipment itself.

[0042] As shown in Table 1, Figure 1The internal circuit of the explosion-proof electrical equipment on the left side of the middle, the measured values ​​of each state detection circuit, and the corresponding fault conditions of the explosion-proof electrical equipment:

[0043] Table 1

[0044]

[0045] In one embodiment, the

[0047] Where V is the normal operating voltage of the device under test.

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

[0049] In one embodiment, the alternating current is connected to the backup intrinsically safe battery via an isolated output module, and the backup intrinsically safe battery is connected to the status detection circuit via an isolated input and output module.

[0050] The voltage value of electronic components is displayed through graphics and text, and it has sleep power saving and wake-up functions. It uses high-impedance sampling circuits for closing and opening intrinsically safe circuits to reduce the impact on equipment. For power-type potential detection points, a safety detection circuit with a fast spark-free fuse is used, and an electrically erasable memory is used to record the equipment's operating status. The data is arranged in a winding manner, and the information data can be backed up to the superior management center. When the equipment has been in operation for several years, the earliest information data will be automatically overwritten.

[0051] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A working status checking circuit for explosion-proof electrical equipment, characterized in that: The circuit includes: multiple state detection circuits, a display, and a backup intrinsically safe battery; 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 to detect and output the voltage of the electronic component, or output the voltage under its own fault; The output end of the state detection circuit is connected to a display; the display is arranged on the housing of the explosion-proof electrical equipment; The state detection circuit is connected to the alternating current and the backup intrinsically safe battery respectively.

2. The working status checking circuit of explosion-proof electrical equipment according to claim 1, characterized in that: The state detection circuit is also connected to the control platform.

3. The working status checking circuit of explosion-proof electrical equipment according to claim 2 is characterized in that: The status detection circuit is also connected to the control platform via the 485MODBUS network and 5G respectively.

4. The working status checking circuit of explosion-proof electrical equipment according to claim 1, characterized in that: The state detection circuit includes: a fuse F1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, and a resistor R6; a diode D1, a diode D2, a diode D3, a diode D4, a transistor Q1, a capacitor C1, a photocoupler 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 connection line between the resistor R5 and the resistor R6, and the other end is connected to the base of the transistor Q1 through the resistor R3; the collector of the transistor 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 connection line between the resistor R2 and the switch S1, and the other end is connected to the connection line between the resistor R3 and the base of the transistor Q1; the emitter of the transistor 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 connection line between the resistor R3 and the base of the transistor Q1 , and the other end is connected to the connection line between the emitter of the transistor Q1 and the resistor R1; the other end of the backup intrinsically safe battery V1 is connected to the connection line between the resistors R1 and R6; one end of the diode D2 is connected to the connection line between the diode D1 and the resistor R3, and the other end is connected to the backup intrinsically safe battery V1; a node is set on the connection line between the emitter of the transistor Q1 and the resistor R1 to lead out a first branch, and the first branch is connected to one end of the CPU; a node is set on the connection line between the resistors R1 and 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.

5. The working status checking circuit of explosion-proof electrical equipment according to claim 4, characterized in that: Said Where V is the normal operating voltage of the device under test.

6. The working status checking circuit of explosion-proof electrical equipment according to claim 4, characterized in that: The rated current of the fuse F1 is 0.5 AMP.

7. The working status checking circuit of explosion-proof electrical equipment according to claim 1, characterized in that: The alternating current is connected to the backup intrinsically safe battery through an isolated output module, and the backup intrinsically safe battery is connected to the state detection circuit through an isolated input and output module.

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