Optical fiber network architecture circuit of double-fan switching protection device

Abstract

The utility model relates to the field of fan switching devices, in particular to an optical fiber network architecture circuit of a double-fan switching protection device, which comprises an optical fiber network for realizing data interaction through optical fibers; the multiple double-fan units are used for underground ventilation; the double-fan switching protection device is used for controlling the double-fan unit through the optical fiber network; the explosion-proof switch is positioned underground and is used for carrying out data exchange on the dual-fan switching protection device through the optical fiber network so as to control the dual-fan switching protection device; and the upper computer is positioned above the well and is used for performing data interaction between a user and the explosion-proof switch through the optical fiber network so as to perform control. The utility model has the effect of improving the transmission reliability and transmission speed of underground signals.

Description

Technical Field

[0001] The present application relates to the field of wind turbine switching devices, and in particular to a fiber optic network architecture circuit of a dual-wind turbine switching protection device. Background Art

[0002] To ensure continuous and stable operation of coal mine ventilation systems, a dual-fan configuration is typically used. If one fan fails or requires maintenance, it can quickly switch to the other to ensure uninterrupted ventilation. However, traditional dual-fan switching protection devices have some issues with signal transmission, such as susceptibility to electromagnetic interference, slow transmission speeds, and low reliability. Utility Model Content

[0003] In order to improve the problem of low signal transmission reliability of conventional dual-fan switching protection devices, the present application provides a fiber optic network architecture circuit for a dual-fan switching protection device.

[0004] The present application provides a fiber optic network architecture circuit for a dual-fan switching protection device, which adopts the following technical solutions:

[0005] A fiber optic network architecture circuit for a dual-fan switching protection device, comprising:

[0006] Fiber optic network, which realizes data interaction through optical fiber;

[0007] Dual-fan units, multiple in number, for underground ventilation;

[0008] A dual-fan switching protection device, used to control the dual-fan unit via the optical fiber network;

[0009] An explosion-proof switch, located underground, for exchanging data with the dual-fan switching protection device via the optical fiber network for control;

[0010] The upper computer is located above the well and is used for allowing the user to exchange data with the flameproof switch through the optical fiber network for control.

[0011] By adopting the above technical solution and building a fiber optic network, fast and reliable signal transmission can be achieved, ensuring the accuracy and timeliness of the dual-fan switching protection device in switching the fans in the dual-fan unit, thereby improving the safety and stability of the system.

[0012] Optionally, there are multiple dual-fan switching protection devices, and the dual-fan switching protection devices correspond one-to-one to the dual-fan groups.

[0013] By adopting the above technical solution, the dual-fan switching protection device corresponds to the dual-fan unit and works independently, reducing the probability of different dual-fan units using the same dual-fan switching protection device and directly affecting multiple dual-fan units when the dual-fan switching protection device fails, achieving a one-to-one correspondence between the dual-fan switching protection device and the dual-fan unit, and improving the stability and reliability of the dual-fan unit's operation.

[0014] Optionally, the dual-fan switching protection device includes:

[0015] An optical fiber conversion circuit is used to receive data from the explosion-proof switch and output the data after isolating it;

[0016] The switching execution circuit receives the output of the optical fiber conversion circuit and controls the dual-fan unit accordingly.

[0017] By adopting the above technical solution, the data signal input by the explosion-proof switch is acquired and isolated through the optical fiber conversion circuit, and then the fan in the dual-fan unit is controlled by the switching execution circuit.

[0018] Optionally, the optical fiber conversion circuit includes a photoelectric converter and a photoelectric coupler OC, the input end of the photoelectric converter receives the signal through the optical fiber, the output end of the photoelectric converter is electrically connected to the input end of the photoelectric coupler OC, and the output end of the photoelectric coupler OC is output as the output end of the optical fiber conversion circuit.

[0019] By adopting the above technical solution, the input signal is converted into an electrical signal by the photoelectric converter, and the photoelectric coupler OC is used to achieve isolation and control the conduction or disconnection of the switching execution circuit.

[0020] Optionally, the switching execution circuit includes relay KA1, relay KA2, contactor KM1 and contactor KM2, and the dual-wind unit includes fan M1 and fan M2. The normally closed contact of relay KA1 is connected in series with the coil of contactor KM1 and electrically connected to the emitter of the output end of the photoelectric coupler OC. The emitter of the output end of the photoelectric coupler OC is grounded. The coil of relay KA2 is connected in parallel to the collector of the output end of the photoelectric coupler OC. The normally open contact of relay KA2 is connected in series with the coil of contactor KM2 and then connected in parallel between the collector of the output end of the photoelectric coupler OC and the ground end. The normally open contact of contactor KM1 is electrically connected to the input end of fan M1, and the normally open contact of contactor KM2 is electrically connected to the input end of fan M2.

[0021] By adopting the above technical solution, the on and off of the contactor is controlled by the relay, and the on and off of the fan is controlled by the contactor, which is convenient, fast, reliable in operation and quick in response.

[0022] Optionally, a thermal protection device FR1 and a thermal protection device FR2 are further included, wherein the thermal protection device FR1 is electrically connected between the normally open contact of the contactor KM1 and the fan M1, and the thermal protection device FR2 is electrically connected between the normally open contact of the contactor KM2 and the fan M2.

[0023] By adopting the above technical solution, the safety of the fan is protected by the thermal protection device.

[0024] Optional, including:

[0025] A current transformer, wherein the primary coil of the current transformer is electrically connected between the AC power grid and the dual-wind turbine, and is used to detect the power supply current of the AC power grid to the dual-wind turbine;

[0026] An overcurrent protection circuit, wherein the secondary coil of the current transformer is electrically connected to the input end of the overcurrent protection circuit, and the output end of the overcurrent protection circuit is electrically connected to the dual-wind unit to control the on and off of the dual-wind unit to achieve overcurrent protection.

[0027] By adopting the above technical solution, the power supply current of the AC power grid is detected by the current transformer, and the overcurrent protection circuit is used to protect the wind turbine when the power supply current of the AC power grid is too large, thereby improving safety and playing a protective role.

[0028] Optional, including:

[0029] A voltage transformer, the primary coil of which is electrically connected between the AC power grid and the dual-wind turbine, and is used to detect the power supply voltage of the AC power grid to the dual-wind turbine;

[0030] An overvoltage protection circuit, wherein the secondary coil of the voltage transformer is electrically connected to the input end of the overvoltage protection circuit, and the output end of the overvoltage protection circuit is electrically connected to the dual-wind unit to control the on and off of the dual-wind unit to achieve overvoltage protection.

[0031] By adopting the above technical solution, the power supply current of the AC power grid is detected by the voltage transformer, and the wind turbine is protected from overvoltage by the overvoltage protection circuit when the power supply voltage of the AC power grid is too large, thereby improving safety and playing a protective role.

[0032] Optionally, a gas concentration detector and a temperature sensor are included, and the gas concentration detector and the temperature sensor are used to detect the gas concentration and temperature and output the detection signals after obtaining them.

[0033] By adopting the above technical solution, the temperature and gas concentration are detected by using a gas concentration detector and a temperature sensor, and the environment around the dual-air unit is monitored, so that the air volume can be adaptively increased or decreased, and the temperature and concentration of the discharged gas can be controlled to remain within a safe range, thereby ensuring safety in the mine.

[0034] Optionally, an intrinsically safe communication module is included, which is electrically connected to the explosion-proof switch to achieve data interaction and outputs the detection signal to the explosion-proof switch to achieve intrinsically safe communication.

[0035] By adopting the above technical solution, data transmission security in flammable and explosive environments is ensured through intrinsically safe communication.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. Realize fast and reliable signal transmission, ensure the accuracy and timeliness of the dual-fan switching protection device switching the fans in the dual-fan unit, and improve the safety and stability of the system.

[0038] 2. Control the temperature and concentration of discharged gas to keep it within a safe range to ensure safety in the mine. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a module schematic diagram of a fiber optic network architecture circuit of a dual-fan switching protection device in an embodiment of the present application.

[0040] Figure 2 This is a circuit diagram highlighting the optical fiber conversion circuit and the switching execution circuit.

[0041] Figure 3 It is a circuit diagram highlighting the AC power grid and dual wind turbines.

[0042] Figure 4 This is a module diagram highlighting the overcurrent protection circuit and overvoltage protection circuit.

[0043] Explanation of the accompanying symbols: 1. Dual-fan unit; 2. Dual-fan switching protection device; 21. Optical fiber conversion circuit; 22. Switching execution circuit; 3. Flameproof switch; 4. Host computer; 5. Optical fiber network; 6. Gas concentration detector; 61. Temperature sensor; 62. Intrinsically safe communication module. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-4 This application is described in further detail.

[0045] The embodiment of the present application discloses a fiber optic network architecture circuit of a dual wind turbine switching protection device. Figure 1The optical fiber network architecture circuit of the dual-fan switching protection device includes a dual-fan group 1, a dual-fan switching protection device 2, a flameproof switch 3, a host computer 4, an optical fiber network 5, a gas concentration detector 6, a temperature sensor 61, and an intrinsically safe communication module 62. The optical fiber network 5 uses optical fiber to network each module or device. There are multiple dual-fan groups 1 to ventilate the well. The dual-fan switching protection device 2 is electrically connected to the dual-fan group 1 through the optical fiber network 5 to achieve control. There are multiple dual-fan switching protection devices 2, and the dual-fan switching protection devices 2 are one-to-one corresponding to the dual-fan groups 1. Multiple dual-fan switching protection devices 2 are electrically connected to the same flameproof switch 3 through the optical fiber network 5 to achieve data interaction. The flameproof switch 3 is located underground. The flameproof switch 3 and the host computer 4 located above the well achieve data interaction through the optical fiber network 5. The user monitors and controls the dual-fan group 1 underground through the host computer 4.

[0046] The dual-fan switching protection device 2 includes an optical fiber conversion circuit 21 and a switching execution circuit 22. The optical fiber conversion circuit 21 includes a photoelectric converter, an optocoupler OC, a resistor R and a capacitor C. The switching execution circuit 22 includes a relay KA1, a relay KA2, a contactor KM1, a contactor KM2, and a diode D. The dual-fan unit 1 includes fans M1 and M2. Both fans M1 and M2 include a control panel, and data interaction and control are achieved through the control panel. Normally, fan M1 is the main fan and fan M2 is the backup fan. The input end of the photoelectric converter receives the signal transmitted from the flameproof switch 3 through the optical fiber, and the output end of the photoelectric converter is electrically connected to the positive pole of the input end of the optocoupler OC. The negative pole of the photoelectric coupler OC input terminal is grounded, the emitter of the photoelectric coupler OC output terminal is grounded, the anode of the diode D is electrically connected to the collector of the photoelectric coupler OC output terminal, the cathode of the diode D is electrically connected to the VCC power supply terminal, the resistor R is connected in series between the anode of the diode D and the collector of the photoelectric coupler OC output terminal, the capacitor C is connected in parallel to both ends of the resistor R, the normally closed contact of the relay KA1 is KA1-2, and the coil is KA1-1, the normally open contact of the relay KA2 is KA2-2, and the coil is KA2-1, the normally open contact of the contactor KM1 is KM1-1, and the coil is KM1-1, the normally open contact of the contactor KM2 is KM2-1, and the coil is KM2-1. One end of the relay KA1-2 is connected in parallel to the negative electrode of the diode D, and the other end of the relay KA1-2 is electrically connected to one end of the contactor KM1-1. The other end of the contactor KM-1 is connected in parallel to the emitter of the output end of the photoelectric coupler OC, and the emitter of the output end of the photoelectric coupler OC is grounded. The relay KA2-1 is connected in parallel to the positive and negative electrodes of the diode D. One end of the relay KA2-2 is connected in parallel to the negative electrode of the diode D. The other end of the relay KA2-2 is electrically connected to one end of the contactor KM2-1. The other end of the contactor KM2-2 is grounded. One end of the relay KA1-1 is connected in parallel to the negative electrode of the diode D. The other end of the relay KA1-1 is connected in parallel to the emitter of the photoelectric coupler OC. One end of the contactor KM1-2 is electrically connected to the three-phase power supply end of the AC power grid.

[0047] The other end of contactor KM1-2 is electrically connected to the input of fan M1. One end of contactor KM2-2 is electrically connected to the three-phase power supply of the AC power grid, and the other end of contactor KM2-2 is electrically connected to the input of fan M2. A thermal protection device FR1 is connected in series between contactor KM1-2 and fan M1, and a thermal protection device FR2 is connected in series between contactor KM2-2 and fan M2.

[0048] The system also includes a current transformer, a voltage transformer, an overcurrent protection circuit, and an overvoltage protection circuit. The current transformer includes a first current transformer and a second current transformer, and the voltage transformer includes a first voltage transformer and a second voltage transformer. The primary coil of the first current transformer is connected in series between the input end of the fan M1 and the three-phase power supply end of the AC power grid, and the primary coil of the first voltage transformer is connected in parallel between the input end of the fan M1 and the three-phase power supply end of the AC power grid. The primary coil of the second current transformer is connected in series between the input end of the fan M2 and the three-phase power supply end of the AC power grid, and the primary coil of the second voltage transformer is connected in parallel between the input end of the fan M2 and the three-phase power supply end of the AC power grid. The secondary coils of the first and second voltage transformers are electrically connected to the input end of the overvoltage protection circuit, and the secondary coils of the first and second current transformers are electrically connected to the input end of the overcurrent protection circuit. The output ends of the overvoltage protection circuit and the overcurrent protection circuit are both electrically connected to the control panel of the dual-wind turbine unit 1.

[0049] The temperature sensor 61 and the gas concentration detector 6 are both installed around the dual-wind unit 1, and each dual-wind unit 1 corresponds to multiple temperature sensors 61 and gas concentration detectors 6. The temperature sensor 61 detects the temperature around the dual-wind unit 1, obtains and outputs a temperature detection signal, and the gas concentration detector 6 detects the gas concentration around the dual-wind unit 1, obtains and outputs a gas concentration detection signal. The temperature sensor 61 and the gas concentration detector 6 are electrically connected to the intrinsically safe communication module 62 through the optical fiber network 5 to realize data interactive communication. The intrinsically safe communication module 62 is electrically connected to the explosion-proof switch 3 through the optical fiber network 5 to realize data interactive communication, so that the temperature detection signal and the gas concentration detection signal detected by the temperature sensor 61 and the gas concentration detector 6 are transmitted to the explosion-proof switch 3 through the intrinsically safe communication module 62, and finally communicated to the host computer 4 for the user to view. If the temperature detection signal exceeds the preset temperature threshold, or the gas concentration detection signal exceeds the preset gas concentration threshold, the host computer 4 will control the standby fan to start to increase the ventilation volume.

[0050] The implementation principle of the optical fiber network architecture circuit of a dual-fan switching protection device in an embodiment of the present application is as follows: if the temperature detected by the temperature sensor 61 or / and the gas concentration detected by the gas concentration detector 6 exceeds a preset temperature threshold value / gas concentration threshold value, the optical fiber network 5 is used to transmit the information to the intrinsically safe communication module 62 and the flameproof switch 3 to the host computer 4. The host computer 4 on the ground detects the abnormal temperature or excessively high gas concentration. The host computer 4 uses the optical fiber network 5 to quickly send a command to the dual-fan switching protection device 2 through the flameproof switch 3 (setting the input end of the optical coupler OC to a high potential). The dual-fan switching protection device 2 then sends a start command to the fan M2, causing the fan M2 to start, thereby reducing the temperature and accelerating the discharge of gas to ensure safety in the mine.

[0051] When the photoelectric converter of the dual-fan switching protection device 2 receives the signal input by the explosion-proof switch 3, it will output the corresponding potential to the input end of the photoelectric coupler OC. When the positive pole of the input end of the photoelectric coupler OC is at a low potential, the input end of the photoelectric coupler OC does not emit light, causing the output end of the photoelectric coupler OC to be disconnected. At this time, the VCC power supply end is directly grounded to the contactor KM1-1 through the relay KA1-2, and the contactor KM1-1 is energized, so that the contactor KM1-2 is closed and connected, and the fan M1 is connected to the three-phase power supply end of the AC power grid to start. The relay KA2-1 is not energized, the relay KA2-2 is disconnected, and the contactor KM2-1 is not energized, causing the contactor KM2-2 to be disconnected, causing the fan M2 to be in a shutdown state. When the input end of the photocoupler OC is at a high potential, the positive electrode of the photocoupler OC input end is forward-conducted and emits light, the emitter and collector of the photocoupler OC output end are connected, the relay KA2-1 is energized, the relay KA2-2 is closed, the contactor KM2-1 is energized, and the contactor KM2-2 is closed, so that the standby motor M2 is connected to the power supply and starts to start.

[0052] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A fiber optic network architecture circuit for a dual-fan switching protection device, characterized in that: include: Optical fiber network (5), which enables data exchange through optical fibers; A plurality of dual-fan units (1) for underground ventilation; A dual-fan switching protection device (2) is used to control the dual-fan unit (1) via the optical fiber network (5); An explosion-proof switch (3), located underground, is used to exchange data with the dual-fan switching protection device (2) via the optical fiber network (5) for control; The upper computer (4) is located above the well and is used for allowing a user to exchange data with the flameproof switch (3) through the optical fiber network (5) for control.

2. The optical fiber network architecture circuit of the dual-fan switching protection device according to claim 1, characterized in that: There are multiple dual-fan switching protection devices (2), and the dual-fan switching protection devices (2) are in one-to-one correspondence with the dual-fan units (1).

3. The optical fiber network architecture circuit of the dual-fan switching protection device according to claim 1, characterized in that: The dual-fan switching protection device (2) comprises: An optical fiber conversion circuit (21) is used to receive data from the flameproof switch (3), isolate the data, and then output it; The switching execution circuit (22) receives the output of the optical fiber conversion circuit (21) and performs corresponding control on the dual-fan unit (1).

4. The optical fiber network architecture circuit of the dual-fan switching protection device according to claim 3, characterized in that: The optical fiber conversion circuit (21) comprises a photoelectric converter and a photoelectric coupler OC, wherein the input end of the photoelectric converter receives a signal via an optical fiber, the output end of the photoelectric converter is electrically connected to the input end of the photoelectric coupler OC, and the output end of the photoelectric coupler OC serves as the output end of the optical fiber conversion circuit (21).

5. The optical fiber network architecture circuit of the dual-fan switching protection device according to claim 4, characterized in that: The switching execution circuit (22) includes a relay KA1, a relay KA2, a contactor KM1 and a contactor KM2. The dual-fan unit (1) includes a fan M1 and a fan M2. The normally closed contact of the relay KA1 is connected in series with the coil of the contactor KM1 and then electrically connected to the emitter of the output end of the photoelectric coupler OC. The emitter of the output end of the photoelectric coupler OC is grounded. The coil of the relay KA2 is connected in parallel to the collector of the output end of the photoelectric coupler OC. The normally open contact of the relay KA2 is connected in series with the coil of the contactor KM2 and then connected in parallel between the collector of the output end of the photoelectric coupler OC and the ground. The normally open contact of the contactor KM1 is electrically connected to the input end of the fan M1, and the normally open contact of the contactor KM2 is electrically connected to the input end of the fan M2.

6. The optical fiber network architecture circuit of the dual-fan switching protection device according to claim 5, characterized in that: The system further comprises a thermal protection device FR1 and a thermal protection device FR2. The thermal protection device FR1 is electrically connected between the normally open contact of the contactor KM1 and the fan M1. The thermal protection device FR2 is electrically connected between the normally open contact of the contactor KM2 and the fan M2.

7. The optical fiber network architecture circuit of the dual-fan switching protection device according to claim 1, characterized in that: include: A current transformer, wherein the primary coil of the current transformer is electrically connected between the AC power grid and the dual-wind turbine (1), and is used to detect the power supply current of the AC power grid to the dual-wind turbine (1); An overcurrent protection circuit, wherein the secondary coil of the current transformer is electrically connected to the input end of the overcurrent protection circuit, and the output end of the overcurrent protection circuit is electrically connected to the dual-wind unit (1) to control the on / off of the dual-wind unit (1) to achieve overcurrent protection.

8. The optical fiber network architecture circuit of the dual-fan switching protection device according to claim 1, characterized in that: include: A voltage transformer, wherein the primary coil of the voltage transformer is electrically connected between the AC power grid and the dual-wind turbine (1), and is used to detect the power supply voltage of the AC power grid to the dual-wind turbine (1); An overvoltage protection circuit, wherein the secondary coil of the voltage transformer is electrically connected to the input end of the overvoltage protection circuit, and the output end of the overvoltage protection circuit is electrically connected to the dual-wind unit (1) to control the on / off of the dual-wind unit (1) to achieve overvoltage protection.

9. The optical fiber network architecture circuit of the dual-fan switching protection device according to claim 1, characterized in that: It comprises a gas concentration detector (6) and a temperature sensor (61), wherein the gas concentration detector (6) and the temperature sensor (61) are used to detect gas concentration and temperature, and output detection signals after obtaining them.

10. The optical fiber network architecture circuit of the dual-fan switching protection device according to claim 9, characterized in that: It comprises an intrinsically safe communication module (62) electrically connected to the flameproof switch (3) to achieve data interaction, and outputs the detection signal to the flameproof switch (3) to achieve intrinsically safe communication.

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