CN-224218143-U - Explosion-proof and intrinsically safe dual-power variable-frequency speed regulating device for coal mine fan

Abstract

The utility model provides an explosion-proof and intrinsically safe double-power-supply variable-frequency speed regulating device for a coal mine fan, which comprises a main variable-frequency loop and an auxiliary variable-frequency loop which are respectively connected with the main fan and the auxiliary fan, a power frequency loop which is connected with the main variable-frequency loop and the auxiliary variable-frequency loop in parallel, a vacuum contactor which is arranged in the main variable-frequency loop, the auxiliary variable-frequency loop, the power frequency loop and the auxiliary power frequency loop and is used for controlling the throwing and the retreating of each loop, a comprehensive protector which is connected with the main power frequency loop and is used for detecting and protecting short circuit, overload, phase interruption, undervoltage, overvoltage and electric leakage faults in the power frequency loop, and a controller expansion module which is in communication connection with the vacuum contactor and the comprehensive protector and is used for switching the operation modes of the variable-frequency loop and the power frequency loop according to fault signals.

Inventors

• TANG LIANG
• CHEN HUI

Assignees

• 上海贯百自动化科技有限公司

Dates

Publication Date

20260508

Application Date

20250529

Claims (5)

1. 1. The explosion-proof and intrinsically safe double-power-supply variable-frequency speed regulating device for the coal mine fan comprises a main variable-frequency loop and an auxiliary variable-frequency loop which are respectively connected with the main fan and the auxiliary fan, and is characterized by further comprising: The power frequency loop is connected with the main frequency conversion loop and the auxiliary frequency conversion loop in parallel; The vacuum contactor is arranged in the main frequency conversion loop, the auxiliary frequency conversion loop, the power frequency loop and the auxiliary power frequency loop and is 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 failure, undervoltage, overvoltage and 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 variable frequency loop and the power frequency loop according to the fault signal.
2. 2. The flameproof and intrinsically safe dual-power variable-frequency speed regulator for the coal mine fans, which is disclosed in claim 1, is characterized in that the input end of a power frequency loop is connected with the wire inlet end of a three-phase power supply, and the output end is directly connected with a load.
3. 3. The flameproof and intrinsically safe dual-power variable-frequency speed regulator for the coal mine fan, which is characterized in that a power frequency loop is provided with a vacuum contactor (KM 3), the vacuum contactor (KM 3) is connected with a comprehensive protector (ZB 2) in series, and the vacuum contactor (KM 3) is connected with the input end of the power frequency loop.
4. 4. The flameproof and intrinsically safe dual-power variable-frequency speed regulator for the coal mine fan, as claimed in claim 3, is characterized by further comprising a leakage detection module, wherein the leakage detection module is installed at the output end for connection.
5. 5. The flameproof and intrinsically safe dual-power variable-frequency speed regulating device for the coal mine fan, which is disclosed in claim 2, is characterized in that the controller expansion module comprises: the power interface unit provides a working power supply for the controller expansion module; The communication interface unit is connected to CANL and CANH of CAN communication; The digital quantity input unit is used for collecting feedback signals, wherein the feedback signals comprise a variable frequency selection feedback signal, a power frequency selection feedback signal, a secondary station variable frequency feedback signal and a secondary station power frequency feedback signal; And the digital quantity output unit is used for outputting signals.

Description

Explosion-proof and intrinsically safe dual-power variable-frequency speed regulating device for coal mine fan Technical Field The utility model relates to the field of exhaust fan control, in particular to an explosion-proof and intrinsically safe dual-power variable-frequency speed regulating device for a coal mine fan. Background The mining fan is an indispensable mechanical device in mining production, and in the mining fans used at present, a variable frequency processing frequency loop speed regulating device is not used in many cases, so that when the variable frequency loops of the main fan and the auxiliary fan are failed, the wind stopping is caused to influence the coal mine safety production. Disclosure of utility model The utility model provides an explosion-proof and intrinsically safe dual-power variable-frequency speed regulating device for a coal mine fan, which can effectively solve the problem that when a main fan variable-frequency loop and a secondary fan variable-frequency loop are failed, the coal mine safety production is affected by wind stopping. In order to achieve the above object, the present utility model provides the following technical solutions: The explosion-proof and intrinsically safe dual-power variable-frequency speed regulating device for the coal mine fan comprises a main variable-frequency loop and an auxiliary variable-frequency loop which are respectively connected with the main fan and the auxiliary fan, and further comprises: The power frequency loop is connected with the main frequency conversion loop and the auxiliary frequency conversion loop in parallel; the vacuum contactor is arranged in the main frequency conversion loop, the auxiliary frequency conversion loop, the power frequency loop and the auxiliary power frequency loop and is 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 failure, undervoltage, overvoltage and 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 variable frequency loop and the power frequency loop according to the fault signal. Further, the input end of the power frequency loop is connected with the three-phase power supply inlet wire end, and the output end is directly connected with the load. Further, the power frequency loop is provided with a vacuum contactor (KM 3), the contactor (KM 3) is connected with the comprehensive protector (ZB 2) in series, and the vacuum contactor (KM 3) is connected with the input end of the power frequency loop. Further, the device also comprises a leakage detection module, wherein the leakage detection module is installed at the output end and connected. Further, the controller expansion module includes: the power interface unit provides a working power supply for the controller expansion module; The communication interface unit is connected to CANL and CANH of CAN communication; The digital quantity input unit is used for collecting feedback signals, wherein the feedback signals comprise a variable frequency selection feedback signal, a power frequency selection feedback signal, a secondary station variable frequency feedback signal and a secondary station power frequency feedback signal; And the digital quantity output unit is used for outputting signals. The utility model can realize the switching of the power frequency and the variable frequency control of the fan, can realize the on-site and remote double-layer control of the fan in the variable frequency state, and saves the labor to the site. Drawings The utility model is described in further detail below with reference to the drawings and the detailed description. FIG. 1 is a schematic diagram of a system according to the present utility model. Fig. 2 is an electrical schematic diagram of a main inverter circuit of the present utility model. Fig. 3 is a schematic diagram of a frequency converter according to the present utility model. FIG. 4 is a schematic diagram of a controller expansion module according to the present utility model. Detailed Description Embodiments of the utility model are described in detail below with reference to the attached drawing figures, but the utility model can be implemented in a number of different ways, which are defined and covered by the claims: As shown in FIG. 1, the utility model provides an explosion-proof and intrinsically safe dual-power variable-frequency speed regulating device for a coal mine fan, which comprises a main variable-frequency loop and an auxiliary variable-frequency loop which are respectively connected with the main fan and the auxiliary fan, and further comprises: And when the fan breaks down in the variable frequency loop, the fan is switched from the main variable freq