An integrated backup power supply device for local ventilation fans in coal mines

Abstract

The present invention relates to the field of electrical equipment, and in particular to an integrated backup power supply device for local ventilation fans in coal mines, comprising: a main and backup fan monitoring module, which is used to continuously monitor the status of the power supply lines of the main and backup fans online; a flameproof special power supply device, which is used to access the power grid and charge or discharge according to the content of the control instruction; a power management module, which is used to detect the voltage of the flameproof special power supply device, and when the voltage of the flameproof special power supply device is lower than the set value, a charging instruction is generated, and the flameproof special power supply device is also used to charge after receiving the charging instruction; when the voltage of the flameproof special power supply device is not lower than the set value, a stop charging instruction is generated. The present invention is compact and efficient, and when the main / backup power supply is cut off at the same time, it can automatically detect the double stop signal, and quickly start the third backup fan under the condition of meeting the safety conditions, output AC660V power supply, and ensure the normal ventilation work.

Description

Technical Field

[0001] The invention relates to the field of electrical equipment, and in particular to an integrated backup power supply device for a local ventilator in a coal mine. Background Art

[0002] In the underground working environment of coal mines, local ventilators at the excavation and development working faces are key equipment to ensure the safety of miners and normal production. In order to ensure the stable operation of the ventilators, a dual power supply system is currently widely used, and the "three special and two interlocking" management measures are implemented to prevent ventilation interruptions caused by power failures.

[0003] However, even under such management measures, there are still situations where the dual power sources stop supplying power at the same time due to personnel misoperation, equipment failure, etc., which may cause gas over-limit accidents and seriously endanger mine safety and the lives of miners.

[0004] In view of the particularity of coal mine operations and the strict safety requirements, there is an urgent need for a technical solution that can automatically switch and maintain the operation of the ventilator when the dual power supply fails. Such a solution should be able to quickly start the backup fan to ensure that local ventilation is not interrupted, thereby preventing gas accumulation and buying valuable time for personnel evacuation or troubleshooting.

[0005] The backup power supply device for local fans in the mine on the market is usually composed of multiple independent components, such as the mine flameproof and intrinsically safe inverter, the mine flameproof charger, the mine flameproof step-up transformer, and the coal mine lead-acid battery explosion-proof special power supply device. This decentralized equipment configuration has many inconveniences in transportation, installation and operation in the mine, and is not efficient.

[0006] Therefore, there is an urgent need for a compact, efficient and integrated coal mine local ventilator backup power supply device that can automatically detect the double stop signal when the main and backup power sources are simultaneously out of power, and quickly start the third backup fan under the condition of meeting safety conditions, output AC660V power supply, and ensure the normal ventilation work. Summary of the invention

[0007] The present invention provides an integrated backup power supply device for local ventilation fans in coal mines, which is compact and efficient. When the main and backup power supplies fail at the same time, it can automatically detect the double stop signal and quickly start the third backup fan under the condition of meeting safety conditions, output AC660V power supply, and ensure the normal ventilation work.

[0008] In order to solve the above technical problems, this application provides the following technical solutions:

[0009] An integrated coal mine local ventilator backup power supply device, comprising:

[0010] The main and standby fan monitoring module is used to continuously monitor the status of the power supply lines of the main and standby fans online;

[0011] Flameproof special power supply device, used to access the power grid and charge or discharge according to the control instructions;

[0012] A power management module is used to detect the voltage of the flameproof special power supply device, and when the voltage of the flameproof special power supply device is lower than a set value, a charging instruction is generated, and the power management module is also used to charge after receiving the charging instruction; when the voltage of the flameproof special power supply device is not lower than the set value, a stop charging instruction is generated, and the power management module is also used to stop charging after receiving the stop charging instruction;

[0013] A gas concentration detection module is used to monitor gas concentration and obtain gas concentration information;

[0014] A control module is used to receive the status of the power supply lines of the main and standby fans and determine whether a power outage occurs; if the power supply lines of the main and standby fans simultaneously lose power, a pre-start instruction is generated, and then the gas concentration information is read. If the gas concentration information exceeds a preset value, the pre-start instruction is abandoned; if the gas concentration information is lower than the preset value, the pre-start instruction is upgraded to a normal start instruction and sent to the power management module. The power management module is also used to send the normal start instruction to the flameproof special power supply device. The flameproof special power supply device is also used to discharge outward after receiving the normal start instruction; if any of the power supply lines of the main and standby fans resumes power supply, an output shutdown instruction is generated;

[0015] The isolation inverter transformer is used to invert and transform the current output by the flameproof special power supply device into a current with preset parameters to supply the third standby fan when the flameproof special power supply device discharges outward. The preset parameter current is AC660V.

[0016] The basic scheme principle and beneficial effects are as follows: The present invention is a highly automated monitoring and control system designed to ensure ventilation safety in coal mine operations. The main and standby fan monitoring module is responsible for real-time monitoring of the status of the main and standby fan power supply lines to ensure that abnormal conditions in the power supply lines can be detected in a timely manner. The flameproof special power supply device, as the core power supply component of the system, is responsible for charging or discharging according to the access status and control instructions of the power grid. The power management module is the intelligent control center of the system. It intelligently generates charging or stopping charging instructions by detecting the voltage level of the flameproof special power supply device. When the voltage of the power supply device is lower than the set value, the power management module will issue a charging instruction to start charging the flameproof special power supply device; when the voltage reaches the preset value, a stop charging instruction is issued to avoid overcharging and extend battery life.

[0017] The gas concentration detection module is responsible for monitoring the gas concentration in the mine and providing key safety data for the control system. The control module receives status information from the main and standby fan monitoring modules and determines whether a power outage has occurred. If the main and standby fans lose power at the same time, the control module will generate a pre-start instruction and further check the gas concentration information. If the gas concentration exceeds the standard, the control module will give up starting for safety reasons; if the gas concentration is within the safe range, the control module will upgrade the pre-start instruction to a normal start instruction and send it to the power management module and the flameproof special power supply device to start the process of discharging outward. The isolation inverter transformer plays a role when the flameproof special power supply device is discharging, inverting and transforming the output current to a preset parameter current suitable for the third standby fan, ensuring that the standby fan can start and run smoothly.

[0018] In the present invention, multiple key functional modules are integrated together, which reduces the need for additional equipment, reduces system complexity and maintenance costs. Through continuous online monitoring and intelligent control logic, the device of the present invention can quickly respond to abnormal conditions of the power supply line, thereby improving the safety of coal mine operations. In the present invention, the combination of the gas concentration detection module and the control module ensures that the backup fan will not be started when the gas concentration exceeds the standard, thereby preventing possible safety accidents. The automatic charging management function of the power management module ensures that the flameproof special power supply device can provide power in time when needed, while avoiding overcharging of the battery. When the power supply line of the main backup fan loses power, the control module can quickly generate a start-up command and supply power to the third backup fan through the isolation inverter transformer, thereby ensuring the continuity of the ventilation system and the safe evacuation of miners. The present invention takes into account the special environment of coal mine operations, and adopts key components such as flameproof special power supply devices and isolation inverter transformers to improve the reliability and durability of the system.

[0019] In summary, the present invention achieves the purpose of compact structure and high efficiency by integrating key modules together. When the main / backup power supplies are cut off at the same time, it can automatically monitor the double stop signal and quickly start the third backup fan when safety conditions are met, output AC660V power supply, and ensure the normal ventilation work.

[0020] Furthermore, it also includes an output circuit monitoring module, which is used to determine whether there is a short circuit or overcurrent in the output circuit. If a short circuit and / or overcurrent occurs, an overcurrent alarm instruction is generated and sent to the power management module. The power management module is used to send an overcurrent alarm instruction to the flameproof special power supply device upon receiving the overcurrent alarm instruction. The flameproof special power supply device is also used to stop outputting current to the outside upon receiving the overcurrent alarm instruction.

[0021] This approach can reduce safety risks.

[0022] Furthermore, it also includes a shell, and the flameproof special power supply device, power management module, control module and isolation inverter transformer are integrated and fixed in the shell.

[0023] This approach can ensure a compact and safe structure.

[0024] Furthermore, it also includes a sound and light alarm module; the control module is also used to generate a sound and light alarm instruction when the gas concentration information exceeds a preset value, and the sound and light alarm module is also used to execute a sound and light alarm externally when receiving the sound and light alarm instruction.

[0025] This method can provide reminders in case of abnormalities and ensure personnel safety.

[0026] Furthermore, the sound and light alarm module is embedded and fixed on the side of the shell.

[0027] This method can serve as a better reminder.

[0028] Furthermore, a main cavity door cover is provided on the shell, and the main cavity door cover is hinged to the shell, a sealing gasket for improving the sealing performance is provided between the main cavity door cover and the shell, and the sealing gasket is fixedly connected to the edge of the shell, a ventilation pipe is provided on the side of the shell, a detection element is provided on the inner wall of the ventilation pipe, a horizontal air intake pipe is provided below the detection element, one end of the air intake pipe is connected to the interior of the shell, a cooling fan for inhaling air is provided on the air intake pipe, a sealing door that can be opened inwards is provided at the connection between the air intake pipe and the shell, the sealing door is hinged to the shell, a limiting member is also provided inside the shell, the limiting member is slidably connected to the shell, and a There is a driving member for pushing the limit member to limit the closed sealing door, and the sealing door and the shell are respectively provided with a first contact and a second contact that are turned on when the sealing door is in a closed state; a compensation element is provided outside the shell, and the first contact and the second contact are respectively connected to the detection element and the compensation element circuit, and the detection element and the compensation element form a Wheatstone bridge, and the control module is also used to read the current parameters of the detection element when it is turned on; the upper and lower ends of the ventilation pipe are provided with dust covers made of metal material, and a sponge buffer layer is also provided under the ventilation pipe, and the sponge buffer layer is fixedly connected to the shell, and the shell is provided with an air outlet located in the sponge buffer layer.

[0029] Since the overall working environment is in a mine containing explosive and dangerous gases and coal dust, the entire device needs to be protected. In this solution, the main chamber door cover is connected to the outer shell by a hinged connection, which is convenient for opening and closing. At the same time, a sealing gasket is set between the door cover and the outer shell to improve the overall sealing performance and prevent external harmful substances from entering the control module. The ventilation duct on the side of the outer shell is designed to maintain air circulation inside the equipment, and the detection element on the inner wall is responsible for monitoring the environmental parameters in the ventilation duct. The setting of the air intake duct allows air to flow in, and the cooling fan is located below the air intake duct to inhale air to assist in cooling the equipment. A sealing door that can be opened inward is provided at the connection between the air intake duct and the outer shell, which further enhances the sealing of the equipment. At the same time, the hinged design of the sealing door allows it to be opened and closed flexibly.

[0030] The limiter is designed to ensure the correct closing of the sealed door, and the driver is responsible for pushing the limiter to ensure the stability of the sealed door in the closed state. When the sealed door is closed, the first contact and the second contact are turned on (setting the contacts on the sealed door can reduce interference factors when reading data), and are connected to the detection element and the compensation element circuit to form a Wheatstone bridge. The control module monitors the internal environment of the ventilation duct by reading the current parameters of the detection element when it is turned on. Both ends of the ventilation duct are equipped with metal dust covers to prevent dust and impurities from entering, while the sponge buffer layer below provides additional protection to reduce the impact of mechanical shock on the equipment.

[0031] And because the detection element mainly detects methane through flameless combustion (other methods such as laser / infrared to detect methane are too expensive to use under harsh conditions), metal dust covers are provided at both ends of the ventilation pipe to reduce heat conduction and avoid accidents caused by excessive temperature during the detection process (similar to the principle of David lamp, the heat released by combustion inside is absorbed by the outer metal to avoid explosion). The waste heat generated then flows upward, and the by-product (water) flows downward after condensation (while cleaning the inner wall of the ventilation pipe), is absorbed by the sponge buffer layer, and then evenly distributed on the outer shell under the capillary action of the sponge buffer layer, and takes away a large amount of heat during the evaporation process.

[0032] Cold air enters from the bottom of the ventilation duct. If the sealing door and the cooling fan are opened at this time, since the air inlet duct is located below the detection element (flameless combustion part), this part of cold air can enter the shell to dissipate the heat of the components in the shell, and then be discharged from the air outlet. On the one hand, the sponge buffer layer provides dust protection at the air outlet, and on the other hand, the residual moisture evaporates, taking away more heat and improving the heat dissipation effect.

[0033] Furthermore, the driving element is a linear motor or an electromagnet.

[0034] This way allows the drive member to play a better driving role.

[0035] Furthermore, the compensation element is arranged outside the sponge buffer layer.

[0036] This approach allows the compensation element to better detect the ambient temperature.

[0037] Furthermore, an A / D conversion module is provided between the control module and the detection element.

[0038] This method can ensure the accuracy of the readings of the detection element.

[0039] Furthermore, it also includes a communication module, and the communication module is connected to the control module by signal.

[0040] This method can better send relevant data to the target address, making it easier for managers to understand relevant information. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The electrical schematic diagram of an integrated coal mine local ventilator backup power supply device embodiment 1;

[0042] Figure 2 A controller wiring diagram of an integrated coal mine local ventilator backup power supply device embodiment 1;

[0043] Figure 3 It is a schematic diagram of the structure of the housing in implementation 2;

[0044] Figure 4 for Figure 3 A side cross-sectional view of the connection structure of the central vent pipe, the air intake pipe and the outer shell;

[0045] Figure 5 for Figure 4 A partial enlarged view of the center sealing door and limiter. DETAILED DESCRIPTION

[0046] The following is further described in detail through specific implementation methods:

[0047] The figure marks in the drawings of the specification include: outer shell 10, main cavity door cover 20, ventilation duct 30, detection element 31, air intake duct 32, cooling fan 33, sealing door 40, limit member 41, driving member 42, first contact 43, second contact 44, dustproof net 50, sponge buffer layer 51.

[0048] Example 1

[0049] An integrated coal mine local ventilation fan backup power supply device (such as Figure 1 , Figure 2 shown), including:

[0050] The main and standby fan monitoring module (in this embodiment, a circuit power detector is used, and of course other devices that can detect whether the power supply line is conductive can also be used) is used to continuously monitor the status of the power supply line of the main and standby fans online;

[0051] Flameproof special power supply device (model DXT336 / 450F, the power box in the picture) is used to connect to the power grid and charge or discharge according to the control instructions;

[0052] The power management module (expressed as a charging module in the figure) is used to detect the voltage of the flameproof special power supply device. When the voltage of the flameproof special power supply device is lower than a set value, a charging instruction is generated. The power management module is also used to charge after receiving the charging instruction; when the voltage of the flameproof special power supply device is not lower than the set value, a stop charging instruction is generated. The power management module is also used to stop charging after receiving the stop charging instruction;

[0053] A gas concentration detection module is used to monitor gas concentration and obtain gas concentration information;

[0054] A control module is used to receive the status of the power supply lines of the main and standby fans and determine whether a power outage occurs; if the power supply lines of the main and standby fans simultaneously lose power, a pre-start instruction is generated, and then the gas concentration information is read. If the gas concentration information exceeds a preset value, the pre-start instruction is abandoned; if the gas concentration information is lower than the preset value, the pre-start instruction is upgraded to a normal start instruction and sent to the power management module. The power management module is also used to send the normal start instruction to the flameproof special power supply device. The flameproof special power supply device is also used to discharge outward after receiving the normal start instruction; if any of the power supply lines of the main and standby fans resumes power supply, an output shutdown instruction is generated;

[0055] The isolation inverter transformer (expressed as an inverter module in the figure) is used to invert and transform the current output by the flameproof special power supply device into a current of preset parameters to supply the third standby fan when the flameproof special power supply device discharges outward. The preset parameter current is AC660V.

[0056] It also includes a shell, and the flameproof special power supply device, power management module, control module and isolation inverter transformer are integrated and fixed in the shell. It also includes a sound and light alarm module; the control module is also used to generate a sound and light alarm instruction when the gas concentration information exceeds the preset value, and the sound and light alarm module is also used to execute a sound and light alarm externally when receiving the sound and light alarm instruction. The sound and light alarm module is embedded and fixed on the side of the shell. It also includes a communication module, and the communication module is connected to the control module signal (not drawn). The above device relies on a power module (PV200-27B24) and an intrinsically safe power supply (MKD-II-X-12V) for power supply (mainly low-voltage 12V power supply, charging, voltage stabilization, etc.). Of course, a display module is also provided to read relevant data on the spot.

[0057] When used specifically: The main and standby fan monitoring module continuously monitors the power supply line status of the main and standby fans online (an insulation detection module can also be set to detect the overall insulation condition) to ensure that the power supply condition can be understood in real time. The flameproof special power supply device is connected to the power grid and charges or discharges according to the control instructions. The power management module is responsible for detecting the voltage level of the power supply device. When the voltage of the flameproof special power supply device is lower than the set value, the power management module generates a charging instruction and the power supply device starts charging. Once the voltage reaches or exceeds the set value, the power management module generates a stop charging instruction and the power supply device stops charging immediately.

[0058] The gas concentration detection module is responsible for monitoring the gas concentration in the mine and transmitting the concentration information to the control module. The control module receives the status information from the main and standby fan monitoring module to determine whether a power outage has occurred. If the main and standby fan power supply lines lose power at the same time, the control module generates a pre-start instruction.

[0059] The control module reads the gas concentration information. If the gas concentration exceeds the preset value, the standby fan will not be started; if the gas concentration is lower than the preset value, the control module upgrades the pre-start instruction to a normal start instruction and sends it to the power management module. The power management module sends the normal start instruction to the flameproof special power supply device, which starts to discharge outward. At the same time, the isolation inverter transformer inverts the discharged current into a preset parameter current of AC660V and supplies it to the third standby fan.

[0060] If any of the main and standby fan power supply lines resumes power supply, the control module generates an output shutdown command to stop the discharge of the flameproof special power supply unit. The flameproof special power supply unit, power management module, control module and isolation inverter transformer are integrated and fixed in the housing to ensure the compactness and safety of the system.

[0061] The sound and light alarm module is embedded and fixed on the side of the shell. When the gas concentration of the control module exceeds the preset value, the sound and light alarm module immediately executes the sound and light alarm to remind relevant personnel to take corresponding measures. The communication module is connected to the control module signal to ensure that the system can communicate with the outside world and transmit key information, such as status updates, alarm signals, etc., for remote monitoring and management.

[0062] Example 2

[0063] Compared with the embodiment 1, the only difference is that the housing is provided with a main chamber door cover (such as Figure 3 As shown), the main cavity door cover is hinged with the shell, a sealing gasket for improving the sealing performance is arranged between the main cavity door cover and the shell, the sealing gasket is fixedly connected to the edge of the shell, a ventilation pipe is arranged on the side of the shell, a detection element is arranged on the inner wall of the ventilation pipe, a horizontal air intake pipe is arranged below the detection element, one end of the air intake pipe is communicated with the inside of the shell, and a cooling fan for inhaling air is arranged on the air intake pipe (as shown in FIG. Figure 4 As shown), a sealing door that can be opened inward is provided at the connection between the air inlet pipe and the shell, the sealing door is hinged to the shell, a limiting member is provided inside the shell, the limiting member is slidably connected to the shell, and a driving member for pushing the limiting member to limit the closed sealing door is provided between the limiting member and the shell, and a first contact and a second contact (as shown) that are conductive when the sealing door is in a closed state are respectively provided on the sealing door and the shell. Figure 5 As shown); a compensation element is arranged outside the shell, the first contact and the second contact are respectively connected to the detection element and the compensation element circuit, the detection element and the compensation element form a Wheatstone bridge, and the control module is also used to read the current parameters of the detection element when it is turned on; the upper and lower ends of the ventilation pipe are provided with metal dust covers, and a sponge buffer layer is also arranged below the ventilation pipe, the sponge buffer layer is fixedly connected to the shell, and the shell is provided with an air outlet located in the sponge buffer layer. The driving part is a linear motor. The compensation element is arranged outside the sponge buffer layer.

[0064] When used specifically: The main chamber door cover is connected to the shell through a hinge, which is convenient for opening and closing, while maintaining a close fit between the door cover and the shell. A sealing gasket is installed between the main chamber door cover and the shell to improve the sealing performance of the contact between the two and prevent dust, moisture and other harmful substances from entering the shell. A ventilation duct is provided on the side of the shell, and a detection element is installed on the inner wall to monitor the gas concentration in the ventilation duct. A horizontal air intake duct is provided below the ventilation duct (to prevent dust from entering), one end of which is connected to the inside of the shell. A cooling fan is installed on the air intake duct to inhale air for equipment heat dissipation.

[0065] A sealing door that can be opened inwards is provided at the connection between the air inlet pipe and the shell, and is hinged to the shell to control the air inflow. The limiter inside the shell is slidably connected to the shell, and the limiter is pushed by the driving member (linear motor) to ensure the accurate position of the sealing door when it is closed.

[0066] The sealed door and the housing are provided with a first contact and a second contact. When the sealed door is in a closed state, the two contacts are turned on. The first contact and the second contact are respectively connected to the detection element and the compensation element circuit to form a Wheatstone bridge. The control module monitors the change in gas concentration by reading the current parameters of the detection element when it is turned on. The gas concentration detection is accompanied by flameless combustion. The combustion products condense on the dust cover, clean the inner wall of the ventilation pipe, and drip onto the sponge buffer layer to evaporate again to improve the heat dissipation effect. The gas concentration detection is not always carried out, and when the gas concentration is monitored, the heat is not dissipated. The two do not work at the same time. That is, when the gas concentration is detected, the sealed door is closed.

[0067] Metal dust covers are installed at the upper and lower ends of the ventilation pipe to prevent dust from entering. A sponge buffer layer is installed under the ventilation pipe to provide additional protection and buffering, and is fixedly connected to the shell.

[0068] The air outlet holes in the sponge buffer layer on the housing allow the air sucked in by the cooling fan to be discharged after heat dissipation, keeping the internal temperature of the device stable. The linear motor is used as a drive to accurately control the position of the limiter to ensure the accurate closing and opening of the sealed door.

[0069] Example 3

[0070] Compared with the second embodiment, the only difference is that an A / D conversion module is further provided between the control module and the detection element.

[0071] When used specifically: the change in the current parameter flowing through the detection element is an analog signal, which is processed by the A / D conversion module and fed back to the control module, which can reduce the amount of calculation of the control module.

[0072] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field to which the invention belongs before the application date or the priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. An integrated coal mine local ventilator backup power supply device, characterized in that: include: The main and standby fan monitoring module is used to continuously monitor the status of the power supply lines of the main and standby fans online; Flameproof special power supply device, used to access the power grid and charge or discharge according to the control instructions; A power management module is used to detect the voltage of the flameproof special power supply device, and when the voltage of the flameproof special power supply device is lower than a set value, a charging instruction is generated, and the power management module is also used to charge after receiving the charging instruction; when the voltage of the flameproof special power supply device is not lower than the set value, a stop charging instruction is generated, and the power management module is also used to stop charging after receiving the stop charging instruction; A gas concentration detection module is used to monitor gas concentration and obtain gas concentration information; A control module is used to receive the status of the power supply lines of the main and standby fans and determine whether a power outage occurs; if the power supply lines of the main and standby fans simultaneously lose power, a pre-start instruction is generated, and then the gas concentration information is read. If the gas concentration information exceeds a preset value, the pre-start instruction is abandoned; if the gas concentration information is lower than the preset value, the pre-start instruction is upgraded to a normal start instruction and sent to the power management module. The power management module is also used to send the normal start instruction to the flameproof special power supply device. The flameproof special power supply device is also used to discharge outward after receiving the normal start instruction; if any of the power supply lines of the main and standby fans resumes power supply, an output shutdown instruction is generated; An isolation inverter transformer, used for inverting and transforming the current output by the flameproof special power supply device into a current with a preset parameter to supply the third standby fan when the flameproof special power supply device discharges outward, wherein the preset parameter current is AC660V; It also includes a shell, in which the flameproof special power supply device, the power management module, the control module and the isolation inverter transformer are integrated and fixed; The shell is provided with a main cavity door cover, which is hinged to the shell, a sealing gasket for improving the sealing performance is provided between the main cavity door cover and the shell, the sealing gasket is fixedly connected to the edge of the shell, a ventilation pipe is provided on the side of the shell, a detection element is provided on the inner wall of the ventilation pipe, a horizontal air intake pipe is provided below the detection element, one end of the air intake pipe is connected to the interior of the shell, a cooling fan for inhaling air is provided on the air intake pipe, a sealing door that can be opened inwards is provided at the connection between the air intake pipe and the shell, the sealing door is hinged to the shell, a limiting member is also provided inside the shell, the limiting member is slidably connected to the shell, and a sealing member for A driving member is used to push the limiting member to limit the closed sealing door. The sealing door and the shell are respectively provided with a first contact and a second contact that are turned on when the sealing door is in a closed state; a compensation element is provided outside the shell, the first contact and the second contact are respectively connected to the detection element and the compensation element circuit, the detection element and the compensation element form a Wheatstone bridge, and the control module is also used to read the current parameters of the detection element when it is turned on; the upper and lower ends of the ventilation duct are both provided with dust covers made of metal material, and a sponge buffer layer is also provided under the ventilation duct, the sponge buffer layer is fixedly connected to the shell, and the shell is provided with an air outlet located in the sponge buffer layer.

2. The integrated coal mine local ventilator backup power supply device according to claim 1 is characterized in that: It also includes an output circuit monitoring module, which is used to determine whether there is a short circuit or overcurrent in the output circuit. If a short circuit and / or overcurrent occurs, an overcurrent alarm instruction is generated and sent to the power management module. The power management module is used to send an overcurrent alarm instruction to the flameproof special power supply device upon receiving the overcurrent alarm instruction. The flameproof special power supply device is also used to stop outputting current to the outside upon receiving the overcurrent alarm instruction.

3. The integrated coal mine local ventilator backup power supply device according to claim 2 is characterized in that: It also includes a sound and light alarm module; the control module is also used to generate a sound and light alarm instruction when the gas concentration information exceeds a preset value, and the sound and light alarm module is also used to execute a sound and light alarm externally when receiving the sound and light alarm instruction.

4. The integrated coal mine local ventilator backup power supply device according to claim 3 is characterized in that: The sound and light alarm module is embedded and fixed on the side surface of the shell.

5. The integrated coal mine local ventilator backup power supply device according to claim 4 is characterized in that: The driving member is a linear motor or an electromagnet.

6. The integrated coal mine local ventilator backup power supply device according to claim 5, characterized in that: The compensation element is arranged outside the sponge buffer layer.

7. The integrated coal mine local ventilator backup power supply device according to claim 6, characterized in that: An A / D conversion module is also provided between the control module and the detection element.

8. The integrated coal mine local ventilator backup power supply device according to claim 7, characterized in that: It also includes a communication module, which is connected to the control module by signal.

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