Explosion-proof and intrinsically-safe dual-power-supply frequency conversion speed regulation device for coal mine fan

Abstract

The utility model provides an explosion-proof and intrinsically safe dual-power-supply frequency conversion speed regulation device for a coal mine fan, which comprises a main frequency conversion loop and an auxiliary frequency conversion loop which are respectively connected with a main fan and an auxiliary fan, the power frequency loop is connected with the main frequency conversion loop and the auxiliary frequency conversion loop in parallel; the vacuum contactors are configured in the main frequency conversion loop, the auxiliary frequency conversion loop, the power frequency loop and the auxiliary power frequency loop, and are used for controlling the switching of each loop; the comprehensive protector is connected with the main power frequency loop and is used for detecting and protecting short circuit, overload, phase loss, undervoltage, overvoltage and electric leakage faults in the power frequency loop; and the controller expansion module is in communication connection with the vacuum contactor and the comprehensive protector and is used for switching the operation modes of the frequency conversion loop and the power frequency loop according to the fault signal. The device can effectively solve the problem that when the main fan frequency conversion loop and the auxiliary fan frequency conversion loop fail, wind stopping is caused, and coal mine safety production is influenced.

Description

Technical Field

[0001] This utility model relates to the field of exhaust fan control, specifically an explosion-proof and intrinsically safe dual-power frequency conversion speed regulation device for coal mine fans. Background Technology

[0002] Mining fans are an essential piece of machinery in mining production. However, many of the mining fans currently in use do not use variable frequency drives (VFDs) for speed regulation. As a result, when both the main and auxiliary fan VFD circuits fail, the ventilation will stop, affecting the safe production of coal mines. Utility Model Content

[0003] This utility model provides an explosion-proof and intrinsically safe dual-power frequency conversion speed control device for coal mine fans, which can effectively solve the problem of ventilation stoppage affecting safe production in coal mines when both the main and auxiliary fan frequency conversion circuits fail.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A dual-power variable frequency speed control device for coal mine ventilation fans, comprising a main frequency converter circuit and a secondary frequency converter circuit, respectively connected to the main fan and the secondary fan; also including:

[0006] The power frequency circuit is connected in parallel with the main frequency converter circuit and the auxiliary frequency converter circuit.

[0007] Vacuum contactors are configured in the main frequency converter circuit, the auxiliary frequency converter circuit, the power frequency circuit, and the auxiliary power frequency circuit to control the activation and deactivation of each circuit.

[0008] The integrated protector is connected to the main power frequency circuit and is used to detect and protect against short circuits, overloads, phase loss, undervoltage, overvoltage and leakage faults in the power frequency circuit.

[0009] The controller expansion module is communicatively connected to the vacuum contactor and the integrated protector, and is used to switch the operating mode of the frequency converter circuit and the power frequency circuit according to the fault signal.

[0010] Furthermore, the input terminal of the power frequency circuit is connected to the three-phase power supply input terminal, and the output terminal is directly connected to the load.

[0011] Furthermore, the power frequency circuit is equipped with a vacuum contactor (KM3), which is connected in series with the integrated protector (ZB2), and the vacuum contactor (KM3) is connected to the input terminal of the power frequency circuit.

[0012] Furthermore, it also includes a leakage current detection module, which is installed and connected at the output end.

[0013] Furthermore, the controller expansion module includes:

[0014] The power interface unit provides operating power to the controller expansion module;

[0015] The communication interface unit connects to CANL and CANH for CAN communication;

[0016] The digital input unit is used to acquire feedback signals, including frequency converter selection feedback signals, power frequency selection feedback signals, slave station frequency converter feedback signals, and slave station power frequency feedback signals.

[0017] Digital output unit, used to output signals.

[0018] This invention enables the switching between power frequency and variable frequency control of the fan. In variable frequency mode, the fan can be controlled both on-site and remotely, saving manpower on-site. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a schematic diagram of the system of this utility model.

[0021] Figure 2 This is the electrical schematic diagram of the main frequency converter circuit of this utility model.

[0022] Figure 3 This is a schematic diagram of the frequency converter of this utility model.

[0023] Figure 4 This is a schematic diagram of the controller expansion module of this utility model. Detailed Implementation

[0024] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims:

[0025] like Figure 1 As shown, this utility model provides an explosion-proof and intrinsically safe dual-power variable frequency speed control device for coal mine fans, including a main frequency conversion circuit and an auxiliary frequency conversion circuit, which are respectively connected to the main fan and the auxiliary fan; it also includes:

[0026] Two power frequency circuits are connected in parallel with the main frequency converter circuit and the auxiliary frequency converter circuit. When the fan fails in the frequency converter circuit, it switches from the main frequency converter circuit and / or the auxiliary frequency converter circuit to the power frequency circuit, and the fan operates in power frequency mode to ensure the safety of ventilation in the roadway.

[0027] Vacuum contactors are configured in the main frequency converter circuit, the auxiliary frequency converter circuit, the power frequency circuit, and the auxiliary power frequency circuit to control the activation and deactivation of each circuit.

[0028] The integrated protector is connected to the main power frequency circuit and is used to detect and protect against short circuits, overloads, phase loss, undervoltage, overvoltage and leakage faults in the power frequency circuit.

[0029] The controller expansion module is communicatively connected to the vacuum contactor and the integrated protector, and is used to switch the operating mode of the frequency converter circuit and the power frequency circuit according to the fault signal.

[0030] In one embodiment of this utility model, the input terminal of the power frequency circuit is connected to the three-phase power supply input terminal, and the output terminal is directly connected to the load. Through the coordinated operation of its components, the power frequency circuit realizes emergency power supply, electrical parameter monitoring, and safety protection functions in case of faults, ensuring the continuous operation of the load and system safety under special circumstances.

[0031] In one embodiment of this utility model, the power frequency circuit is equipped with a vacuum contactor (KM3), which is connected in series with the integrated protector (ZB2), and the vacuum contactor (KM3) is connected to the input terminal of the power frequency circuit.

[0032] In one embodiment of this utility model, a leakage current detection module is also included, which is installed and connected to the output terminal. The leakage current detection module is powered by a power supply pin, controls its operating state using an enable pin, acquires three-phase electrical signals using AC, outputs the detection result through M, and ensures safety through PE grounding, thereby ensuring safe circuit operation.

[0033] In one embodiment of this utility model, the controller expansion module includes:

[0034] The power interface unit provides operating power to the controller expansion module;

[0035] It includes pins P24 and G24. P24 connects to the positive terminal of the DC 24V power supply, and G24 connects to the negative terminal (0V) of the power supply, providing operating power to the module. A filter circuit can be configured at the interface to suppress power fluctuations and electromagnetic interference, ensuring stable power supply to the module.

[0036] The communication interface unit connects to CANL and CANH for CAN communication;

[0037] It consists of L / A2 and H / B2 pins, which are connected to CANL and CANH for CAN communication, respectively. It supports the CAN communication protocol, enabling high-speed data transmission with external controllers (such as the main controller of a coal mine ventilation fan), and can adapt to the communication rate requirements of coal mine monitoring systems, ensuring the timeliness and accuracy of data interaction.

[0038] The digital input unit is used to acquire feedback signals, including frequency converter selection feedback signals, power frequency selection feedback signals, slave station frequency converter feedback signals, and slave station power frequency feedback signals.

[0039] Multiple input pins are used to acquire feedback signals. Specifically, DI0 connects to the frequency converter selection feedback signal, DI1 connects to the power frequency selection feedback signal, DI2 receives the slave frequency converter feedback signal, and DI3 receives the slave power frequency feedback signal. These pins employ optocoupler isolation and other technologies to prevent external interference signals from affecting the module's internal circuitry.

[0040] The digital output unit is used to output signals to control the start, stop or switch of slave equipment, thereby achieving precise control of the operating status of the coal mine fan.

[0041] The digital output unit has multiple output pins, with CB0 serving as the common terminal for both power frequency and inverter frequency. RL0 serves as the slave inverter control terminal, and RL1 serves as the slave power frequency control terminal. The output signals are used to control slave devices (such as inverters, power frequency contactors, etc.). The output terminals employ an electrical isolation design to improve anti-interference capabilities and ensure the accuracy of output control signals in the complex electromagnetic environment of underground coal mines.

[0042] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A dual-power variable frequency speed control device for explosion-proof and intrinsically safe coal mine ventilation fans, comprising a main frequency converter circuit and a secondary frequency converter circuit, respectively connected to the main fan and the secondary fan; characterized in that: Also includes: The power frequency circuit is connected in parallel with the main frequency converter circuit and the auxiliary frequency converter circuit. Vacuum contactors are configured in the main frequency converter circuit, the auxiliary frequency converter circuit, the power frequency circuit, and the auxiliary power frequency circuit to control the activation and deactivation of each circuit. The integrated protector is connected to the main power frequency circuit and is used to detect and protect against short circuits, overloads, phase loss, undervoltage, overvoltage and leakage faults in the power frequency circuit. The controller expansion module is communicatively connected to the vacuum contactor and the integrated protector, and is used to switch the operating mode of the frequency converter circuit and the power frequency circuit according to the fault signal.

2. The explosion-proof and intrinsically safe dual-power frequency conversion speed control device for coal mine fans according to claim 1, characterized in that: The input terminal of the power frequency circuit is connected to the three-phase power supply input terminal, and the output terminal is directly connected to the load.

3. The explosion-proof and intrinsically safe dual-power frequency conversion speed control device for coal mine fans according to claim 2, characterized in that: The power frequency circuit is equipped with a vacuum contactor (KM3), which is connected in series with the integrated protector (ZB2). The vacuum contactor (KM3) is connected to the input terminal of the power frequency circuit.

4. The explosion-proof and intrinsically safe dual-power frequency conversion speed control device for coal mine fans according to claim 3, characterized in that: It also includes a leakage current detection module, which is installed and connected at the output end.

5. The explosion-proof and intrinsically safe dual-power frequency conversion speed control device for coal mine fans according to claim 2, characterized in that: The controller expansion module includes: The power interface unit provides operating power to the controller expansion module; The communication interface unit connects to CANL and CANH for CAN communication; The digital input unit is used to acquire feedback signals, including frequency converter selection feedback signals, power frequency selection feedback signals, slave station frequency converter feedback signals, and slave station power frequency feedback signals. Digital output unit, used to output signals.

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