Dual-power dual-frequency-conversion speed regulation system for coal mine fan

Abstract

A dual-power-supply dual-variable-frequency speed regulation system for a coal mine fan is composed of a fan switching module and two variable-frequency speed regulation modules, each variable-frequency speed regulation module comprises a main control unit, a trigger unit, a filter unit and an inverter unit, and the fan switching module comprises a gas sensor and a fan switching control unit. The fan switching control unit is used for switching the two groups of variable-frequency speed regulation modules; the fan switching module further comprises an oxygen sensor connected with the fan switching control unit, and the oxygen sensor is used for detecting the oxygen content of underground air. The frequency conversion speed regulation module further comprises a self-checking unit, the self-checking unit is connected with the fan switching control unit and the main control unit, and the self-checking unit is used for monitoring whether the output power supply has the phenomena of phase loss, undervoltage, overload, overcurrent and short circuit or not. And the two groups of variable-frequency speed regulation modules are respectively connected with the local fan and the gas fan. According to the dual-power-supply dual-frequency-conversion speed regulation system, dual-machine hot standby is achieved, the reliability of underground ventilation is greatly improved, and the safety of underground construction is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of mining electrical appliances, in particular to a dual-power supply dual-frequency speed regulation system for coal mine fans. Background Art

[0002] The underground local ventilator is a key equipment for safe production in coal mines. In order to solve the problem of "one wind blowing" of the underground local ventilator at a constant speed, mining companies often use dual-power dual-frequency speed regulators to control the speed of the local ventilator to achieve energy saving. However, the existing dual-power dual-frequency speed regulators still have at least the following problems:

[0003] 1. The current dual-power dual-frequency speed regulator only monitors the oxygen content of gas, but does not monitor the oxygen content underground, which may cause oxygen deficiency underground.

[0004] 2. The dual-power dual-frequency speed regulator has two systems, one master and one slave. After working for a long time, the speed regulator in the working state will intermittently have problems such as phase loss, undervoltage, overload, overcurrent, short circuit, etc. Although the problems only appear for a short time, continuing to "operate with problems" will cause serious damage to the equipment.

[0005] 3. The current dual-power dual-frequency speed regulator drives a local ventilator. If there is a problem with the local ventilator, a safety accident may occur. Utility Model Content

[0006] In order to overcome the shortcomings of the background technology, the utility model discloses a dual-power dual-frequency speed regulation system for a coal mine fan, which adopts the following technical solutions:

[0007] A dual-power dual-frequency speed regulation system for a coal mine fan is composed of a group of fan switching modules and two groups of frequency conversion speed regulation modules. The frequency conversion speed regulation module includes a main control unit, a trigger unit, a filter unit and an inverter unit. The fan switching module includes a gas sensor and a fan switching control unit. The fan switching control unit is used to switch the two groups of frequency conversion speed regulation modules; the fan switching module also includes an oxygen sensor connected to the fan switching control unit, and the oxygen sensor is used to detect the oxygen content of the air underground; the frequency conversion speed regulation module also includes a self-test unit, which is respectively connected to the fan switching control unit and the main control unit, and is used to monitor whether the output power supply has phase loss, undervoltage, overload, overcurrent, and short circuit; the two groups of frequency conversion speed regulation modules are respectively connected to the local ventilator and the gas fan.

[0008] To further improve the technical solution, the filter unit consists of a primary filter unit, a rectifier unit, and a secondary filter unit, wherein the primary filter unit is connected to an AC660V input power supply, and the secondary filter unit is connected to a trigger unit and an inverter unit.

[0009] To further improve the technical solution, the variable frequency speed regulation module also includes a transformer and a switching power supply, the input ends of the transformer and the switching power supply are connected to the primary filter unit, and the output ends are connected to the main control unit.

[0010] To further improve the technical solution, the variable frequency speed regulation module also includes a current sensor, which is connected to the main control unit and is used to feed back the current value of the output power supply to the main control unit.

[0011] To further improve the technical solution, the oxygen sensor is installed near the underground tunnel face.

[0012] To further improve the technical solution, the fan switching control unit is provided with a human-machine interface, and the human-machine interface is connected to the remote monitoring system.

[0013] After implementing the above technical solution, compared with the background technology, the beneficial effects produced by the utility model are:

[0014] 1. An oxygen sensor is set up to detect the oxygen content of the air underground, and the speed of the fan is adjusted according to the oxygen content to ensure the safety of underground construction. When the oxygen content of the air underground is too low, the fan switching control unit can simultaneously switch on two sets of variable frequency speed control modules to make the ventilation fan and gas fan work at the same time.

[0015] 2. The self-check unit can monitor whether the output power supply has phase loss, undervoltage, overload, overcurrent, or short circuit. If so, the fan switching control unit can quickly switch between two sets of variable frequency speed control modules to put the other fan into operation immediately. At the same time, the fan switching control unit is equipped with a human-machine interface, which is connected to the remote monitoring system and can send an alarm to the remote monitoring end.

[0016] 3. The local ventilation fan and the gas fan are one main and one standby. When one of the fans has a problem, the fan switching control unit can quickly switch the two sets of variable frequency speed control modules to put the other fan into operation immediately. Or, when one of the input power supplies has a problem, the fan switching control unit can quickly switch the two sets of variable frequency speed control modules to prevent oxygen deficiency or excessive gas in the well caused by fan shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 What is shown is the structural schematic diagram of the dual-power supply dual-frequency speed regulation system.

[0018] In the attached figure: 1. 1# variable frequency speed regulation module; 2. 2# variable frequency speed regulation module; 3. fan switching module. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that in the description of the present invention, the terms "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of description, rather than indicating or implying that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0020] As attached Figure 1 As shown, a dual-power dual-frequency speed regulation system for a coal mine fan is composed of a set of fan switching modules 3 and two sets of frequency conversion speed regulation modules, one set is 1# frequency conversion speed regulation module 1, and the other set is 2# frequency conversion speed regulation module 2. The frequency conversion speed regulation module includes a main control unit, a trigger unit, a filter unit and an inverter unit. The function of the frequency conversion speed regulation module is to change the frequency of the output power supply in real time according to the actual situation, so as to achieve the purpose of energy saving. The fan switching module 3 includes a gas sensor and a fan switching control unit. The function of the fan switching control unit is to switch the 1# frequency conversion speed regulation module 1 and the 2# frequency conversion speed regulation module 2 according to the gas content underground.

[0021] In order to solve the problem in the background technology, firstly, the input ends of the two sets of variable frequency speed regulation modules are respectively connected to two sets of independent input power supplies, and the output ends of the two sets of variable frequency speed regulation modules are respectively connected to the local ventilator and the gas blower. In this embodiment, the input power supply is AC660V power supply.

[0022] The beneficial effect of the above design is that the local ventilation fan and the gas fan are one main and one standby. When one of the fans has a problem, the fan switching control unit can quickly switch the two sets of variable frequency speed control modules to put the other fan into operation immediately. Or, when one of the input power supplies has a problem, the fan switching control unit can quickly switch the two sets of variable frequency speed control modules to prevent oxygen deficiency or excessive gas in the well caused by fan shutdown.

[0023] Secondly, an oxygen sensor is also provided in the fan switching module 3, the oxygen sensor is connected to the fan switching control unit, and the oxygen sensor is used to detect the oxygen content of the underground air. In this embodiment, the oxygen sensor is installed near the underground face.

[0024] The current dual-power dual-frequency speed regulator only monitors the oxygen content of gas, but not the oxygen content in the well. The beneficial effect of the above design is that the oxygen sensor is set to detect the oxygen content of the air in the well, and the speed of the fan is adjusted according to the oxygen content to ensure the safety of the well construction. When the oxygen content of the air in the well is too low, the fan switching control unit can simultaneously turn on the 1# variable frequency speed regulation module 1 and the 2# variable frequency speed regulation module 2, so that the ventilation fan and the gas fan work at the same time.

[0025] In addition, a self-test unit is also provided in the frequency conversion speed regulation module, which is respectively connected to the fan switching control unit and the main control unit. The function of the self-test unit is to monitor whether the output power supply has phase loss, undervoltage, overload, overcurrent, or short circuit.

[0026] After long-term operation, the variable frequency speed control module will intermittently experience phase loss, undervoltage, overload, overcurrent, short circuit and other problems. Although the problems only occur for a short time, continuing to "operate with problems" will cause serious damage to the equipment. The beneficial effect of the above design is that the self-test unit can monitor whether the output power supply has phase loss, undervoltage, overload, overcurrent, and short circuit. If so, the fan switching control unit can quickly switch between the two sets of variable frequency speed control modules, so that the other fan can be put into operation immediately. At the same time, the fan switching control unit is equipped with a human-machine interface, which is connected to the remote monitoring system and can send an alarm to the remote monitoring end.

[0027] To further improve the technical solution, the filter unit consists of a primary filter unit, a rectifier unit, and a secondary filter unit, wherein the primary filter unit is connected to an AC660V input power supply, and the secondary filter unit is connected to a trigger unit and an inverter unit.

[0028] The beneficial effect of the above design is that two filtering steps can eliminate clutter and improve the filtering effect.

[0029] To further improve the technical solution, the variable frequency speed regulation module also includes a transformer and a switching power supply, the input end of the transformer and the switching power supply is connected to the primary filter unit, and the output end is connected to the main control unit. The transformer and the switching power supply are used to provide a stable switching current for the main control unit.

[0030] To further improve the technical solution, the variable frequency speed regulation module also includes a current sensor, which is connected to the main control unit. The function of the current sensor is to feedback various parameters of the output power supply to the main control unit. The main control unit can actively modify the trigger parameters according to the various parameters of the output power supply to reduce the occurrence of phase loss, undervoltage, overload, overcurrent and short circuit.

[0031] From the above, it can be seen that the dual-power supply and dual-frequency speed regulation system with dual-machine hot standby greatly improves the reliability of underground ventilation and effectively ensures the safety of underground construction.

[0032] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A dual power supply dual frequency conversion speed regulation system for a coal mine fan, which consists of a fan switching module and two frequency conversion speed regulation modules. The frequency conversion speed regulation module includes a main control unit, a trigger unit, a filter unit and an inverter unit. The fan switching module includes a gas sensor and a fan switching control unit. The fan switching control unit is used to switch the two frequency conversion speed regulation modules. It is characterized by: The fan switching module also includes an oxygen sensor connected to the fan switching control unit, which is used to detect the oxygen content of the air underground; the variable frequency speed regulation module also includes a self-test unit, which is connected to the fan switching control unit and the main control unit respectively, and is used to monitor whether the output power supply has phase loss, undervoltage, overload, overcurrent, and short circuit; the two groups of variable frequency speed regulation modules are respectively connected to the local ventilator and the gas fan.

2. A dual power supply dual frequency conversion speed regulation system for a coal mine fan as claimed in claim 1, characterized in that: The filter unit is composed of a primary filter unit, a rectifier unit, and a secondary filter unit, wherein the primary filter unit is connected to an AC660V input power supply, and the secondary filter unit is connected to a trigger unit and an inverter unit.

3. A dual power supply dual frequency conversion speed regulation system for a coal mine fan as claimed in claim 2, characterized in that: The variable frequency speed regulation module also includes a transformer and a switching power supply. The input ends of the transformer and the switching power supply are connected to the primary filter unit, and the output ends are connected to the main control unit.

4. A dual power supply dual frequency conversion speed regulation system for a coal mine fan as claimed in claim 1, characterized in that: The variable frequency speed regulation module also includes a current sensor, which is connected to the main control unit and is used to feed back the current value of the output power supply to the main control unit.

5. A dual power supply dual frequency conversion speed regulation system for a coal mine fan as claimed in claim 1, characterized in that: The oxygen sensor is installed near the underground tunnel face.

6. A dual power supply dual frequency conversion speed regulation system for a coal mine fan as claimed in claim 1, characterized in that: The fan switching control unit is provided with a human-machine interface, and the human-machine interface is connected to the remote monitoring system.

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