Purified air supply device and method for underground working face

Abstract

The invention discloses a purified air supply device and method for an underground working face. According to the device, a main ventilator and a main air door are installed in a main ventilation pipeline; an auxiliary ventilating pipeline provided with an auxiliary ventilator and an auxiliary air door is connected with the main ventilating pipeline; the fresh air supply mechanism comprises a branch ventilation pipeline, a branch air door, an air purifier, an ultra-clean fresh air monitoring assembly and an individual clean air supply unit. The branch ventilation pipeline provided with the branch ventilation door is connected with the main ventilation pipeline, and the air outlet end of the branch ventilation pipeline is of an open structure; the air purifiers are arranged in the branch ventilation pipelines; the ultra-clean fresh air monitoring assembly is mounted on the branch ventilation pipeline; the individual clean air supply unit comprises a protective air supply pipeline, a one-way valve, a flow pump, a flow controller and a breathing mask. The method comprises the steps that fresh air is supplied into the main ventilation pipeline through the ventilator; deep purification is conducted through the air purifier, and fresh air is guided to the position near the working face or the tunneling face through the branch ventilation pipeline. The device and the method can meet diversified underground clean air supply requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of mine air purification, and in particular relates to a purified air supply device and method for an underground working surface. Background Art

[0002] In the production process of coal mines, air quality plays a vital role in the personal health and safety of workers. In the traditional mine ventilation system, fans are mainly used to deliver fresh air to various working faces and excavation faces of the mine. However, due to the complex environment of the mine, harmful gases and particulate matter such as dust and gas are ubiquitous, and the traditional mine ventilation system usually uses a single filter device to purify the air. Limited by the single structure of the filter device and the limitations of the overall design of the mine ventilation system, the filtration effect of the mine ventilation system is not ideal, and the filtration efficiency is also low, especially for fine particles (such as PM2.5). The removal effect is poor, and the traditional ventilation system is difficult to effectively purify the air underground, so that workers face a series of risks such as dust inhalation and CO poisoning during operation. The existence of these risks will not only affect the personal health of workers, but may also cause serious safety accidents. In addition, the traditional mine ventilation system is prone to problems such as unstable airflow during operation, which often leads to interruptions in air supply and reduced supply efficiency. As a result, it cannot effectively meet the current underground air supply needs. In addition, traditional mine ventilation systems are difficult to flexibly adjust the air supply method according to the actual needs of different working faces or excavation faces, and thus cannot provide diversified purified air supply needs.

[0003] Therefore, there is an urgent need to provide a purified air supply device and method for underground working faces that has ideal filtering effect, good stability, good flexibility, and can meet diverse air purification needs. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a purified air supply device and method for underground working surfaces. The device has convenient operation process, simple maintenance process, ideal filtering effect, good stability, good flexibility, high versatility, can meet various air purification needs, and can provide reliable health protection for workers working underground. The method has a high degree of automation, good safety, and high reliability. It can stably provide purified fresh air supply services for underground working spaces and individuals, and can meet various air supply needs, which can effectively protect the personal health and safety of underground workers and help improve the safety factor of underground operations.

[0005] In order to achieve the above-mentioned object, the present invention provides a purified air supply device for an underground working face, comprising a main ventilation duct, a main ventilator, a main damper, an auxiliary ventilation duct, an auxiliary ventilator, an auxiliary damper, a first wind source monitoring module, a second wind source monitoring module, a fresh air supply mechanism and a controller; The air inlet end of the main ventilation duct starts from the main ventilation shaft or the main air tunnel at the mine entrance, and the air outlet end thereof extends along the length direction of the air supply tunnel; The main fan is installed at the inlet end of the air inlet section of the main ventilation duct; the main air door is located at the downstream side of the main fan and is installed in the middle of the air inlet section of the main ventilation duct; The air inlet end of the auxiliary ventilation duct starts from the secondary ventilation shaft or secondary air tunnel at the mine entrance, and the air outlet end thereof is connected to the outlet end of the air inlet section of the main ventilation duct; The auxiliary ventilator is installed at the inlet end of the air inlet section of the auxiliary ventilation duct; the auxiliary damper is located at the downstream side of the auxiliary ventilator and is installed in the middle section of the auxiliary ventilation duct; The wind source monitoring module 1 is located at the upstream side of the main fan and is installed at the air inlet end of the main ventilation duct; the wind source monitoring module 1 is internally integrated with a CO sensor A, a NO sensor A, a CH4 sensor A, a CO2 sensor A and a TVOC sensor A, and is used to collect a CO concentration signal A, a NO concentration signal A, a CH4 concentration signal A, a CO2 concentration signal A and a TVOC concentration signal A at the location; The wind source monitoring module 2 is located at the upstream side of the auxiliary ventilator and is installed at the air inlet end of the auxiliary ventilation duct; the wind source monitoring module 2 is internally integrated with a CO sensor B, a NO sensor B, a CH4 sensor B, a CO2 sensor B and a TVOC sensor B, and is used to collect a CO concentration signal B, a NO concentration signal B, a CH4 concentration signal B, a CO2 concentration signal B and a TVOC concentration signal B at the location; A plurality of fresh air supply mechanisms are respectively distributed in a plurality of excavation tunnels connected to the air supply tunnels, and the fresh air supply mechanisms include branch ventilation ducts, branch dampers, air purifiers, ultra-clean fresh air monitoring components and individual clean air supply units; The branch ventilation duct extends along the length direction of the excavation tunnel, its air inlet end is connected to the main ventilation duct, and its air outlet end extends to the vicinity of the excavation face or the working face, and is an open structure; The branch damper is installed at the inlet end of the air inlet section of the branch ventilation duct; The air purifier is connected in series to the air inlet section of the branch ventilation duct and is located on the downstream side of the branch damper; the air purifier comprises an outer shell, a cyclone separator, a front filter screen, a middle filter screen, a high-precision composite filter mechanism and a CO elimination component; both left and right ends of the outer shell are open structures, respectively serving as a purified air inlet and a purified air outlet; the cyclone separator is installed in the purified air inlet of the outer shell; the front filter screen and the middle filter screen are respectively installed inside the left section and the middle section of the outer shell, and the aperture of the middle filter screen is smaller than the aperture of the front filter screen; the outer diameter of the high-precision composite filter mechanism is the same as the inner diameter of the outer shell, and is installed inside the right section of the outer shell; the CO elimination component is installed in the purified air outlet of the outer shell; The ultra-clean fresh air monitoring component is installed on the branch ventilation duct and is located on the downstream side of the air purifier; the ultra-clean fresh air monitoring component includes a temperature and humidity monitoring module, a particle concentration monitoring module, a multi-dimensional air pollutant monitoring module, an alarm module and a processing module, and the processing module is respectively connected to the temperature and humidity monitoring module, the particle concentration monitoring module, the multi-dimensional air pollutant monitoring module and the alarm module; the temperature and humidity monitoring module, the particle concentration monitoring module and the multi-dimensional air pollutant monitoring module are located inside the branch ventilation duct, and the alarm module and the processing module are located outside the branch ventilation duct; the temperature and humidity monitoring module is used to collect the temperature at the location humidity signal, the particle concentration monitoring module is used to collect the particle concentration signal at the location, and the multi-dimensional air pollutant monitoring module is internally integrated with a CO sensor, a NO sensor, a CH4 sensor, a CO2 sensor, and a TVOC sensor, which are used to collect a CO concentration signal, a NO concentration signal, a CH4 concentration signal, a CO2 concentration signal, and a TVOC concentration signal at the location; the processing module is used to obtain corresponding monitoring data according to the received monitoring signal, and compare it with the corresponding monitoring threshold, and control the alarm module to perform an alarm action when the monitoring data exceeds the monitoring threshold; The number of the individual clean air supply units is one or more, and the individual clean air supply units include a protective air supply pipeline, a one-way valve, a flow pump, a flow controller and a breathing mask; the air inlet end of the protective air supply pipeline is located at the downstream side of the ultra-clean fresh air monitoring component, and is connected to the branch ventilation duct in a through-connected manner, and the air outlet end thereof extends to the individual activity space located near the excavation face or the working face; the one-way valve, the flow pump and the flow controller are sequentially connected in series on the protective air supply pipeline from the air inlet side to the air outlet side, and the breathing mask is connected to the air outlet end of the protective air supply pipeline through a flexible connecting pipeline; The controller is respectively connected to the main damper, the auxiliary damper, the main ventilator, the auxiliary ventilator, the branch damper, the ultra-clean fresh air monitoring component, the wind source monitoring module 1, the wind source monitoring module 2, the cyclone separator and the flow pump.

[0006] As a preferred embodiment, the breathing mask comprises a mask body, a resonance component, an inhalation valve, an exhalation valve, ear hooks and a hanging rope; The mask body has a breathing cavity inside, and its rear side is an open structure adapted to the face, and the surrounding of the open part is made of silicone material; two mounting interfaces connected to the breathing cavity are symmetrically opened on the upper front side of the mask body, an air outlet interface connected to the breathing cavity is connected to the lower front side, an air inlet interface connected to the breathing cavity is opened on the front side, and an air inlet grille is installed inside the air inlet interface; the air inlet interface is connected to the air outlet end of the protective air supply pipeline through a flexible pipeline; Two resonance components are correspondingly installed in the two installation interfaces, and the resonance components are used to transmit the wearer's voice to the outside world by resonance; the inhalation valve is installed inside the outlet interface; the breathing valve is installed inside the inlet interface and is located on the inner side of the inlet grille; the two hanging ears are symmetrically fixedly connected to the two sides of the rear outer wall of the mask body; the two ends of the hanging rope are respectively connected to the hanging holes on the two hanging ears.

[0007] Furthermore, in order to improve the jet effect, an air outlet end plate is also included; the air outlet end plate is packaged at the air outlet end of the branch ventilation duct; a plurality of air outlet holes are opened all over the surface of the air outlet end plate, and a plurality of conical nozzles are connected to the positions of the plurality of air outlet holes on the side away from the branch ventilation duct; the conical nozzle has a frustum-shaped inner cavity inside, and the large mouth end of the frustum-shaped inner cavity is adapted to the aperture of the air outlet hole and is interconnected, and the small mouth end of the frustum-shaped inner cavity is located on the side away from the air outlet hole. By connecting the conical nozzle having a frustum-shaped inner cavity to the outside of the air outlet hole of the air outlet end plate, the transition of the gradually increasing cavity diameter can be used to increase the flow rate of the airflow, thereby improving the jet effect, and at the same time, the airflow acting in the relatively open space can have a better diffusion effect, which is conducive to forming a clean microspace with better cleanliness and a larger range in the relatively open space.

[0008] Furthermore, in order to quickly and conveniently connect the branch ventilation duct with the individual clean air supply unit, a plurality of connection interfaces for connecting the individual clean air supply unit are provided on the pipe body at the end of the branch ventilation duct, and a control valve is installed at the connection interface.

[0009] As a preferred embodiment, the branch ventilation duct is installed at the top of the excavation tunnel.

[0010] In the present invention, the main ventilation duct is laid along the length direction of the air supply tunnel, which can reasonably provide each specific excavation tunnel with an appropriate distance of the wind source access point, thereby improving the convenience of the air supply access process of the working face. The main air door is installed in the air inlet section of the main ventilation duct, and the main fan is installed on the upstream side of the main air door. At the same time, the air outlet end of the auxiliary ventilation duct is connected to the downstream side of the main air door, and the auxiliary air door is installed in the middle section of the auxiliary ventilation duct, and the auxiliary fan is installed on the upstream side of the auxiliary air door. In this way, two fans, one main and one standby, can be provided as power sources, so that when any fan fails, the other fan can be quickly switched to the power source. At the same time, since the air inlet end of the main ventilation duct and the air inlet end of the auxiliary ventilation duct start from different ventilation shafts or wind tunnels, when the quality of the fresh air at any starting position deteriorates significantly, the fresh air at another starting position can also be quickly used as a high-quality air source. By respectively setting the wind source monitoring modules one and two on the upstream side of the main fan and the auxiliary fan, the quality of the wind source upstream of the main fan and the auxiliary fan can be comprehensively monitored in real time, and then when the quality of one wind source does not meet the requirements, a signal can be quickly sent out so as to quickly switch to another wind source, thereby ensuring the safety and reliability of the underground air supply operation. A plurality of fresh air supply mechanisms are set in the length direction of the main ventilation duct, and one end of the branch ventilation duct in the fresh air supply mechanism is connected to the main ventilation duct, and the other end is extended to the excavation face or working face, so that the fresh air entering the main ventilation duct can be conveniently guided to the vicinity of each excavation face or working face by using a plurality of fresh air supply mechanisms, so as to facilitate the supply of purified air to multiple working faces and excavation faces. The branch damper is installed in the air inlet section of the branch ventilation duct, which can conveniently control the access or disconnection of the fresh air supply mechanism to the device, thereby improving the flexibility of control. The outlet end of the branch ventilation duct is extended to the vicinity of the excavation face or the working face, and is an open structure, which is conducive to forming a clean micro-space with better cleanliness in a relatively open space. Since the dust concentration in the clean micro-space is much lower than the dust concentration in other areas, people in the clean micro-space can wear a breathing mask connected to the supply device, or wear an independent individual protective mask with less breathing resistance and lower protection standard. For individuals who need to move frequently in the clean micro-space, they have higher requirements for mobility flexibility. In this way, they can wear an individual protective mask with less breathing resistance and lower protection standard that is independent of the device. Since the breathing resistance of the individual protective mask is small, there will be no obvious discomfort even if it is worn for a long time. For individuals who do not need to move frequently in the clean micro-space, they have lower requirements for mobility flexibility. In this way, they can wear a breathing mask connected to the device. This diversified supply method obviously meets the diversified air supply needs of individuals underground.By setting up the cyclone separator, the large particles in the fresh air can be separated from the airflow by the centrifugal principle, so that these large-size particles will not enter the subsequent filter, ensuring the filtering efficiency of the subsequent filter. At the same time, it is helpful to avoid the situation of excessive wind resistance or blockage caused by large particles adhering to the filter. While ensuring the air supply efficiency, it can also help reduce the maintenance frequency of the filter mechanism. The sieve hole diameter of the front filter screen is made larger than the sieve hole diameter of the middle filter screen. The front filter screen can be used to intercept and filter out particles with smaller particle sizes, and then the middle filter screen can be used to intercept and filter out particles with fine particle sizes. In this way, it is ensured that particles with smaller particle sizes will not directly enter the middle filter screen, and that particles with fine particle sizes will not directly enter the high-precision composite filter mechanism, thereby ensuring the filtering effect and filtering efficiency of the middle filter screen on particles with fine particle sizes, and at the same time, ensuring the filtering effect and filtering efficiency of the high-precision composite filter mechanism on ultrafine particles. The air purifier is provided with a cyclone separator, a front filter screen, a middle filter screen and a high-precision composite filter mechanism from the air inlet side to the air outlet side. Through the four-fold progressive graded deep purification technology, namely "primary interception-pre-filtration-strong filtration-deep purification", the particles of different particle sizes in the air flow can be fully filtered step by step, ensuring that various particles in the air can be filtered out layer by layer from large to small, significantly improving the air purification effect, thereby achieving the purpose of deep purification and effectively protecting the health of breathing individuals. Through the setting of the CO elimination component, carbon monoxide in the filtered airflow can be effectively removed, thereby avoiding carbon monoxide poisoning of underground workers. Installing the ultra-clean fresh air monitoring component on the downstream side of the air purifier can facilitate the monitoring of the quality of the filtered fresh air, and thus timely discover the situation where the quality of the filtered fresh air is unqualified. Setting the temperature and humidity monitoring module, the particle concentration monitoring module and the multi-dimensional air pollutant monitoring module in the ultra-clean fresh air monitoring component can comprehensively and reliably monitor the quality of the fresh air, thereby effectively ensuring the quality of the fresh air supplied to the breathing individuals. Setting a processing module and an alarm module in the ultra-clean fresh air monitoring component is conducive to timely alarm action in the control alarm module when the monitoring data exceeds the monitoring threshold, which can remind relevant personnel to check and repair the air purifier or air source in time. At the same time, it can also help managers to find out the situation of excessive dangerous gases in time, which can help avoid the occurrence of safety accidents. By setting a one-way valve in the protective air supply pipeline, it can ensure that the deeply purified air in the branch ventilation duct can only be output to the outside in one direction, and the air near the excavation face or working face will not enter the branch ventilation duct through the protective air supply pipeline. Thus, the problem of air pollution caused by backflow is avoided, and the safety and reliability of the device are further improved. By setting a flow pump, a suitable negative pressure can be provided for the protective air supply pipeline, which is conducive to introducing the deeply purified airflow in the branch ventilation duct into the breathing mask.Through the control of the flow controller, the air flow in the protective air supply duct can be easily adjusted and monitored in real time, so as to provide an appropriate amount of clean air according to the actual needs of the workers, avoid insufficient or excessive air supply, and ensure the breathing comfort and safety of individual users.

[0011] The device is easy to operate, simple to maintain, has an ideal filtering effect, good stability, good flexibility, high versatility, and can flexibly adapt to different working environments. Through the use of this device, it can reliably provide clean air supply for underground working faces, significantly improve the air quality in the working area, and meet the diverse air supply needs of individuals working underground, providing reliable health protection for workers working underground, and helping to improve safety during the operation process.

[0012] The present invention also provides a method for supplying purified air to an underground working surface, using a purified air supply device for an underground working surface, comprising the following steps: Step 1: Use the wind source monitoring module 1 to monitor the fresh air quality on the upstream side of the main fan, and send the collected CO concentration signal A, NO concentration signal A, CH4 concentration signal A, CO2 concentration signal A and TVOC concentration signal A to the controller, the controller obtains CO concentration data A, NO concentration data A, CH4 concentration data A, CO2 concentration data A and TVOC concentration data A according to the CO concentration signal A, NO concentration signal A, CH4 concentration signal A, CO2 concentration data A and TVOC concentration data A, and obtains fresh air quality data 1 on the upstream side of the main fan according to the CO concentration data A, NO concentration data A, CH4 concentration data A, CO2 concentration data A and TVOC concentration data A; The wind source monitoring module 2 is used to monitor the fresh air quality on the upstream side of the auxiliary ventilator, and the collected CO concentration signal B, NO concentration signal B, CH4 concentration signal B, CO2 concentration signal B and TVOC concentration signal B are sent to the controller. The controller obtains CO concentration data B, NO concentration data B, CH4 concentration data B, CO2 concentration data B and TVOC concentration data B according to the CO concentration signal B, NO concentration signal B, CH4 concentration data B, CO2 concentration data B and TVOC concentration data B, and obtains fresh air quality data 2 on the upstream side of the auxiliary ventilator according to the CO concentration data B, NO concentration data B, CH4 concentration data B, CO2 concentration data B and TVOC concentration data B; When the main fan fails, or the fresh air quality data 2 is better than the fresh air quality data 1, the controller controls the main fan to stop, controls the main air door to close, controls the auxiliary fan to start, controls the auxiliary air door to open, and uses the auxiliary fan to supply fresh air to the main ventilation duct, and executes step 2; when the auxiliary fan fails, or the fresh air quality data 1 is better than the fresh air quality data 2, the controller controls the auxiliary fan to stop, controls the auxiliary air door to close, controls the main fan to start, controls the main air door to open, and reuses the main fan to supply fresh air to the main ventilation duct. Intake fresh air and execute step 2; when the main fan and the auxiliary fan are normal, and the fresh air quality data 1 is equal to the fresh air quality data 2, keep the current air supply state unchanged; when the main fan and the auxiliary fan are both faulty, or the fresh air quality data 1 and the fresh air quality data 2 are over-polluted and cannot meet the normal air supply requirements, the controller controls the main fan to stop, controls the main air door to close, controls the auxiliary fan to stop, controls the auxiliary air door to stop, and sends an alarm signal to the remote alarm terminal connected to it to remind relevant personnel to deal with it in time; Step 2: According to the air supply demand, the branch damper in the corresponding fresh air supply mechanism is controlled to open, and the air purifier is controlled to start working, so that the fresh air in the main ventilation duct enters the corresponding branch ventilation duct through the branch damper, and the front filter screen, the middle filter screen, and the high-precision composite filter mechanism in the air purifier are used to deeply filter the dust particles in the incoming fresh air. At the same time, the CO elimination component is used to remove carbon monoxide in the filtered fresh air to achieve deep purification of the fresh air, and then the deeply purified fresh air is guided to the excavation face or working face through the branch ventilation duct to supply the purified fresh air; During the deep purification process, large particles in the fresh air are separated by a cyclone separator and discharged to the outside of the branch ventilation duct. The large particles in the fresh air are filtered by the front filter screen, the fine particles in the fresh air are filtered by the middle filter screen, and the ultra-fine particles in the fresh air are filtered by a high-precision composite filter mechanism. During the air supply operation, the jet and diffusion effect of the deeply purified fresh air blown out at high speed from the outlet end of the branch ventilation duct is utilized to form a relatively clean microspace in the relatively open space near the excavation face or the working face, and the polluted air flow in the excavation face or the working face is blown into the air supply tunnel; at the same time, the ultra-clean fresh air monitoring component is used to monitor and warn the quality of the fresh air after deep purification. Specifically, the temperature and humidity signals at the location are collected through the temperature and humidity monitoring module and sent to the processing module; the particle concentration signal at the location is collected through the particle concentration monitoring module and sent to the processing module; the CO concentration signal 1, NO concentration signal 1, CH4 concentration signal 1, CO2 concentration signal 1 and TVOC concentration signal 1 at the location are collected through the multi-dimensional air pollutant monitoring module and sent to the processing module; the processing module obtains the temperature and humidity signals according to the temperature and humidity signals, the particle concentration signals, the CO concentration signal 1, the NO concentration signal 1, the CH4 concentration signal 1, the CO2 concentration signal 1 and the TVOC concentration signal 1. The processing module controls the alarm module to perform an alarm action when any of the monitoring values ​​exceeds the monitoring threshold. At the same time, the processing module sends an alarm signal to the controller. When the controller receives the alarm signal, it controls the branch damper in the fresh air supply mechanism to close, stops the air supply operation, and sends an alarm signal to the remote alarm terminal connected thereto to remind relevant personnel to handle the problem in a timely manner. At the same time, the flow pump in the corresponding individual clean air supply unit is started according to individual needs, and the negative pressure provided by the flow pump is used to guide a part of the fresh air after deep purification into the protective air supply pipeline, and then transport it to the breathing mask worn by the individual user. Synchronously, the wind source monitoring module 1 is used to monitor the fresh air quality on the upstream side of the main fan. When the main fan fails, or the fresh air quality data 2 is better than the fresh air quality data 1, the controller controls the main fan to stop, controls the main air damper to close, controls the auxiliary fan to start, controls the auxiliary air damper to open, and uses the auxiliary fan to supply fresh air to the main ventilation duct; when the auxiliary fan fails, or the fresh air quality data 1 is better than the fresh air quality data 2, the controller controls the auxiliary fan to stop, controls the auxiliary air damper to close, controls the main fan to start, controls the main air damper to open, and reuses the main fan to supply fresh air to the main ventilation duct; when both the main fan and the auxiliary fan fail, or the fresh air quality data 1 and the fresh air quality data 2 cannot meet the normal air supply requirements, the controller controls the main fan to stop, controls the main air damper to close, controls the auxiliary fan to stop, controls the auxiliary air damper to stop, controls the branch air damper to close, stops the air supply operation, and sends an alarm signal to the remote alarm terminal connected to it to remind relevant personnel to deal with it in time.

[0013] As a preference, in step 2, the user adjusts the flow controller according to his or her own situation to obtain an air flow supply flow that meets his or her own needs.

[0014] In the present invention, during the operation of the ventilator, the fresh air quality on the upstream side of the main ventilator is monitored by using the wind source monitoring module 1, and the fresh air quality on the upstream side of the auxiliary ventilator is monitored by using the wind source monitoring module 2, so that the fresh air quality data 1 on the upstream side of the main ventilator and the fresh air quality data 2 on the upstream side of the auxiliary ventilator can be obtained respectively, and then the power source and the wind source can be conveniently switched according to the quality of the fresh air quality data or the failure of the two ventilators, thereby ensuring the stable and reliable operation of the entire device. During the operation of the fresh air supply mechanism, the jet and diffusion effect of the deep purified fresh air blown out at high speed at the outlet end of the branch ventilation duct are used to form a relatively clean micro space in the relatively open space near the excavation face or the working face, and the dust concentration within the range of personnel activities can be reduced by the micro space purification technology, so as to further improve the health protection of the operators. In this way, the operators are allowed to use protective masks with less breathing resistance and lower filtering standards in the clean micro space, which is conducive to the personnel in the clean micro space to move and work more flexibly. Through the formation of the clean micro space, the diversified needs of underground air supply are met, and different solutions are provided for the underground air supply technology. The negative pressure provided by the flow pump is used to guide the fresh air into the breathing mask. The flow rate of the flow pump itself can be used to effectively balance the flow rate of the airflow, which can help improve the comfort during breathing. During the deep purification process, the cyclone separator is used to separate the large particles in the fresh air, so that these large-size particles will not enter the subsequent filter net, ensuring the filtration efficiency of the subsequent filter net. At the same time, it is helpful to avoid excessive wind resistance or blockage caused by large particles adhering to the filter net. While ensuring the air supply efficiency, it can also help reduce the maintenance frequency of the filter mechanism. The air purifier is provided with a cyclone separator, a front filter screen, a middle filter screen, a high-precision composite filter mechanism and a CO elimination component from the air inlet side to the air outlet side. The four-fold progressive graded deep purification technology, namely "primary interception-pre-filtration-strong filtration-deep purification", can be used to fully filter particles of different particle sizes in the air flow step by step, ensuring that various particles in the air can be filtered out layer by layer from large to small, significantly improving the air purification effect. The CO elimination component is then used to remove carbon monoxide from the filtered fresh air, achieving the purpose of deep purification and effectively protecting the health of the breathing individual. In the air supply process, the ultra-clean fresh air monitoring component is used to monitor and warn the quality of the fresh air after deep purification, so that the deterioration of the fresh air quality can be discovered in time. When the deterioration of the fresh air quality is discovered, the alarm module is controlled to perform an alarm action. At the same time, an alarm signal is sent to the controller, which can facilitate the automatic stop of the air supply operation, thereby avoiding the supply of toxic and harmful gases to the workers, further ensuring the reliability and safety of the device.

[0015] This method has a high degree of automation, good safety and high reliability. It can stably provide purified fresh air supply services for underground working spaces and individuals, and can meet diversified air supply needs. It can effectively protect the personal health and safety of underground workers and help improve the safety factor of underground operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural schematic diagram of the air purifier in the present invention; Figure 3 It is a structural schematic diagram of the air outlet end plate in the present invention; Figure 4 It is a structural schematic diagram of a respiratory mask in the present invention.

[0017] In the figure: 1. Main fan, 2. Auxiliary fan, 3. Air purifier, 4. Main ventilation duct, 5. Branch ventilation duct, 6. Main damper, 7. Ultra-clean fresh air monitoring component, 8. Protective air supply pipeline, 9. Flow controller, 10. Flow pump, 11. Breathing mask, 12. Individual clean air supply unit, 13. Check valve, 14. Excavation face, 15. Working face, 16. Clean micro space, 17. Auxiliary ventilation duct, 18. Auxiliary damper, 19. Fresh air supply mechanism, 20. Branch air Door, 21. Cyclone separator, 22. Front filter screen, 23. Mid-end metal filter, 24. High-precision composite filter mechanism, 25. Outer shell, 26. Mask body, 27. Air outlet interface, 28. Air inlet interface, 29. Air inlet grille, 30. Inhalation valve, 31. Resonance component, 32. Installation interface, 33. Hanging ear, 34. Connection interface, 35. Wind source monitoring module 1, 36. Wind source monitoring module 2, 37. Air outlet end plate, 38. Conical nozzle, 39. CO elimination component. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] like Figures 1 to 4 As shown, the present invention provides a purified air supply device for an underground working face, comprising a main ventilation duct 4, a main ventilator 1, a main damper 6, an auxiliary ventilation duct 17, an auxiliary ventilator 2, an auxiliary damper 18, a wind source monitoring module 1 35, a wind source monitoring module 2 36, a fresh air supply mechanism 19 and a controller; The air inlet end of the main ventilation duct 4 starts from the main ventilation shaft or the main air tunnel at the mine entrance, and the air outlet end thereof extends along the length direction of the air supply tunnel; The main fan 1 is installed at the inlet end of the air inlet section of the main ventilation duct 4; the main damper 6 is located at the downstream side of the main fan 1 and installed in the middle of the air inlet section of the main ventilation duct 4; The air inlet end of the auxiliary ventilation duct 17 starts from the secondary ventilation shaft or secondary air tunnel at the mine entrance, and the air outlet end thereof is connected to the outlet end of the air inlet section of the main ventilation duct 4; The auxiliary fan 2 is installed at the inlet end of the air inlet section of the auxiliary ventilation duct 17; the auxiliary damper 18 is located at the downstream side of the auxiliary fan 2 and installed in the middle section of the auxiliary ventilation duct 17; The wind source monitoring module 35 is located at the upstream side of the main fan 1 and is installed at the air inlet end of the main ventilation duct 4; the wind source monitoring module 35 is internally integrated with a CO sensor A, a NO sensor A, a CH4 sensor A, a CO2 sensor A and a TVOC sensor A, and is used to collect a CO concentration signal A, a NO concentration signal A, a CH4 concentration signal A, a CO2 concentration signal A and a TVOC concentration signal A at the location; The wind source monitoring module 2 36 is located at the upstream side of the auxiliary ventilator 2 and is installed at the air inlet end of the auxiliary ventilation duct 17; the wind source monitoring module 2 36 is internally integrated with a CO sensor B, a NO sensor B, a CH4 sensor B, a CO2 sensor B and a TVOC sensor B, and is used to collect a CO concentration signal B, a NO concentration signal B, a CH4 concentration signal B, a CO2 concentration signal B and a TVOC concentration signal B at the location; A plurality of fresh air supply mechanisms 19 are respectively distributed in a plurality of excavation tunnels connected to the air supply tunnels, and the fresh air supply mechanism 19 includes a branch ventilation duct 5, a branch damper 20, an air purifier 3, an ultra-clean fresh air monitoring component 7 and an individual clean air supply unit 12; The branch ventilation duct 5 extends along the length direction of the tunneling tunnel, and its air inlet end is connected to the main ventilation duct 4 through-through, and its air outlet end extends to the vicinity of the tunneling face 14 or the working face 15, and is an open structure; as a preferred embodiment, the air outlet end of the branch ventilation duct 5 can be kept at a certain distance from the fixed work station located in the tunneling face 14 or the working face 15; in this way, the high-speed airflow blown out from the air outlet end of the branch ventilation duct 5 can be used to form a relatively clean micro space 16 in a relatively open space, and the micro space clean technology can be used to reduce the dust concentration within the range of personnel activities, thereby People in the clean micro-space 16 can wear the breathing mask 11 or wear an independent individual protective mask with low breathing resistance and low protection standard according to their needs. Individuals with low mobility requirements in the space can wear the breathing mask 11 connected to the device, while individuals with high mobility requirements in the space can wear an individual protective mask with low breathing resistance and low protection standard that is independent of the device. Since they are in the clean micro-space 16, even if they wear an individual protective mask with a low protection standard, they can still reliably ensure the personal health of the workers, thereby meeting the diverse needs of the underground mine. The branch damper 20 is installed at the inlet end of the air inlet section of the branch ventilation duct 5; The air purifier 3 is connected in series to the air inlet section of the branch ventilation duct 5 and is located on the downstream side of the branch damper 20; the air purifier 3 includes an outer shell 25, a cyclone separator 21, a front filter screen 22, a middle filter screen 23, a high-precision composite filter mechanism 24 and a CO elimination component 39; the left and right ends of the outer shell 25 are both open structures, respectively serving as a purified air inlet and a purified air outlet; the cyclone separator 21 is installed in the purified air inlet of the outer shell 25; the front filter screen 22 and the middle filter screen 23 are respectively installed inside the left section and the middle section of the outer shell 25, and the sieve aperture of the middle filter screen 23 is smaller than the sieve aperture of the front filter screen 22; the outer diameter of the high-precision composite filter mechanism 24 is the same as the inner diameter of the outer shell 25, and is installed inside the right section of the outer shell 25; the CO elimination component 39 is installed in the purified air outlet of the outer shell 25; wherein the high-precision composite filter mechanism 24 is used to filter fine particulate matter (such as PM2.5); As for the air purifier 3, it can make full use of its own structure, and through the four-fold progressive graded deep purification technology, namely "primary interception-pre-filtration-strong filtration-deep purification", the particles of different particle sizes in the airflow are fully filtered step by step, thereby achieving the purpose of deep purification. The cyclone separator 21 can use the principle of centrifugation to separate large particles in the fresh air from the airflow, so that these large-size particles will not enter the subsequent filter net, ensuring the filtration efficiency of the subsequent filter net. At the same time, it is helpful to avoid the excessive wind resistance caused by large particles adhering to the filter net. Furthermore, the CO elimination component 39 can also be used to effectively remove carbon monoxide in the filtered airflow, thereby avoiding carbon monoxide poisoning for underground workers.

[0020] The ultra-clean fresh air monitoring component 7 is installed on the branch ventilation duct 5 and is located on the downstream side of the air purifier 3; the ultra-clean fresh air monitoring component 7 includes a temperature and humidity monitoring module, a particle concentration monitoring module, a multi-dimensional air pollutant monitoring module, an alarm module and a processing module, and the processing module is respectively connected to the temperature and humidity monitoring module, the particle concentration monitoring module, the multi-dimensional air pollutant monitoring module and the alarm module; the temperature and humidity monitoring module, the particle concentration monitoring module and the multi-dimensional air pollutant monitoring module are located inside the branch ventilation duct 5, and the alarm module and the processing module are located outside the branch ventilation duct 5; the temperature and humidity monitoring module is used to collect the location The temperature and humidity signals at the location, the particle concentration monitoring module is used to collect the particle concentration signal at the location, and the multi-dimensional air pollutant monitoring module is internally integrated with a CO sensor 1, an NO sensor 1, a CH4 sensor 1, a CO2 sensor 1 and a TVOC sensor 1, which are used to collect a CO concentration signal 1, an NO concentration signal 1, a CH4 concentration signal 1, a CO2 concentration signal 1 and a TVOC concentration signal 1 at the location; the processing module is used to obtain corresponding monitoring data according to the received monitoring signal, and compare it with the corresponding monitoring threshold, and control the alarm module to perform an alarm action when the monitoring data exceeds the monitoring threshold; As a preferred embodiment, the particle concentration monitoring module can be monitored based on the principle of light scattering, in which the laser and the photoelectric sensing unit are placed at 90 degrees in the detection light chamber. When the dust particles pass through the light-sensitive area formed by the laser emitted by the laser and the photoelectric sensing unit, a scattering effect is formed on the laser. According to the intensity of the scattered light signal, the particle size can be statistically calculated, and then the particle concentration can be obtained; The number of the individual clean air supply units 12 is one or more, and the individual clean air supply units 12 include a protective air supply pipeline 8, a one-way valve 13, a flow pump 10, a flow controller 9 and a breathing mask 11; the air inlet end of the protective air supply pipeline 8 is located at the downstream side of the ultra-clean fresh air monitoring component 7, and is connected to the branch ventilation duct 5 in a through-connected manner, and the air outlet end thereof extends to the individual activity space located near the excavation face 14 or the working face 15; the one-way valve 13, the flow pump 10 and the flow controller 9 are connected in series on the protective air supply pipeline 8 from the air inlet side to the air outlet side, and the breathing mask 11 is connected to the air outlet end of the protective air supply pipeline 8 through a flexible connecting pipeline; As a preferred embodiment, the protective air supply duct 8 is made of pressure-resistant, wear-resistant and anti-static materials, and it can also have a certain ductility to better adapt to different working environments.

[0021] The controller is respectively connected to the main damper 6, the auxiliary damper 18, the main ventilator 1, the auxiliary ventilator 2, the branch damper 20, the ultra-clean fresh air monitoring component 7, the wind source monitoring module 1 35, the wind source monitoring module 2 36, the cyclone separator 21 and the flow pump 10. As a preferred embodiment, the controller is a PLC controller.

[0022] The breathing mask 11 includes a mask body 26, a resonance assembly 31, an inhalation valve 30, a breathing valve, a hanging ear 33 and a hanging rope; As a preferred embodiment, the mask body 26 has a breathing cavity inside, and its rear side is an open structure adapted to the face, and the surrounding of the open part is made of silicone material; two mounting interfaces 32 connected to the breathing cavity are symmetrically opened on the upper front side of the mask body 26, an air outlet interface 27 connected to the breathing cavity is connected to the lower front side, an air inlet interface 28 connected to the breathing cavity is opened on the front side, and an air inlet grille 29 is installed inside the air inlet interface 28; the air inlet interface 28 is connected to the air outlet end of the protective air supply pipeline 8 through a flexible pipeline; Two resonance components 31 are correspondingly installed in two installation interfaces 32, and the resonance components 31 are used to transmit the wearer's voice to the outside world by resonance; the inhalation valve 30 is installed inside the air outlet interface 27; the breathing valve is installed inside the air inlet interface 28 and is located on the inner side of the air inlet grille 29; two hanging ears 33 are symmetrically fixedly connected to the two sides of the rear outer wall of the mask body 26; the two ends of the hanging rope are respectively connected to the hanging holes on the two hanging ears 33. By making the open part of the mask body 26 of silicone material, not only can the comfort during wearing be effectively improved, but also the fit between the mask body 26 and the wearer's face can be significantly improved, thereby preventing dust from entering the breathing cavity through the gap between the mask body 26 and the wearer's face, effectively ensuring the personal health and safety of workers.

[0023] In order to improve the jet effect, an air outlet end plate 37 is also included; the air outlet end plate 37 is packaged at the air outlet end of the branch ventilation duct 5; a plurality of air outlet holes are opened all over the surface of the air outlet end plate 37, and a plurality of conical nozzles 38 are connected to the positions of the air outlet holes on the side away from the branch ventilation duct 5; the conical nozzle 38 has a frustum-shaped inner cavity inside, and the large mouth end of the frustum-shaped inner cavity is adapted to the aperture of the air outlet hole and is interconnected, and the small mouth end of the frustum-shaped inner cavity is located on the side away from the air outlet hole. By connecting a conical nozzle with a frustum-shaped inner cavity to the outside of the air outlet hole of the air outlet end plate, the flow velocity of the airflow can be increased by utilizing the transition of the gradually increasing cavity diameter, thereby improving the jet effect. At the same time, the airflow acting in the relatively open space can have a better diffusion effect, which is conducive to forming a clean microspace with better cleanliness and a larger range in the relatively open space.

[0024] In order to quickly and conveniently connect the branch ventilation duct to the individual clean air supply unit, a plurality of connection interfaces 34 for connecting the individual clean air supply unit 12 are provided on the pipe body at the end of the branch ventilation duct 5, and a control valve is installed at the connection interface 34. The control valve can block the connection interface 34 when the individual clean air supply unit 12 is not connected to the connection interface 34, so as to avoid the waste of purified air caused by the deep purified air flowing out directly from the connection interface 34.

[0025] As another embodiment, a quick connection mechanism may be connected to the air outlet end of the branch ventilation duct 5 to facilitate the connection of the extended section and the adjustment of the air outlet direction.

[0026] As a preferred embodiment, the branch ventilation duct 5 is installed at the top of the excavation tunnel.

[0027] In the present invention, the main ventilation duct is laid along the length direction of the air supply tunnel, which can reasonably provide each specific excavation tunnel with an appropriate distance of the wind source access point, thereby improving the convenience of the air supply access process of the working face. The main air door is installed in the air inlet section of the main ventilation duct, and the main fan is installed on the upstream side of the main air door. At the same time, the air outlet end of the auxiliary ventilation duct is connected to the downstream side of the main air door, and the auxiliary air door is installed in the middle section of the auxiliary ventilation duct, and the auxiliary fan is installed on the upstream side of the auxiliary air door. In this way, two fans, one main and one standby, can be provided as power sources, so that when any fan fails, the other fan can be quickly switched to the power source. At the same time, since the air inlet end of the main ventilation duct and the air inlet end of the auxiliary ventilation duct start from different ventilation shafts or wind tunnels, when the quality of the fresh air at any starting position deteriorates significantly, the fresh air at another starting position can also be quickly used as a high-quality air source. By respectively setting the wind source monitoring modules one and two on the upstream side of the main fan and the auxiliary fan, the quality of the wind source upstream of the main fan and the auxiliary fan can be comprehensively monitored in real time, and then when the quality of one wind source does not meet the requirements, a signal can be quickly sent out so as to quickly switch to another wind source, thereby ensuring the safety and reliability of the underground air supply operation. A plurality of fresh air supply mechanisms are set in the length direction of the main ventilation duct, and one end of the branch ventilation duct in the fresh air supply mechanism is connected to the main ventilation duct, and the other end is extended to the excavation face or working face, so that the fresh air entering the main ventilation duct can be conveniently guided to the vicinity of each excavation face or working face by using a plurality of fresh air supply mechanisms, so as to facilitate the supply of purified air to multiple working faces and excavation faces. The branch damper is installed in the air inlet section of the branch ventilation duct, which can conveniently control the access or disconnection of the fresh air supply mechanism to the device, thereby improving the flexibility of control. The outlet end of the branch ventilation duct is extended to the vicinity of the excavation face or the working face, and is an open structure, which is conducive to forming a clean micro-space with better cleanliness in a relatively open space. Since the dust concentration in the clean micro-space is much lower than the dust concentration in other areas, people in the clean micro-space can wear a breathing mask connected to the supply device, or wear an independent individual protective mask with less breathing resistance and lower protection standard. For individuals who need to move frequently in the clean micro-space, they have higher requirements for mobility flexibility. In this way, they can wear an individual protective mask with less breathing resistance and lower protection standard that is independent of the device. Since the breathing resistance of the individual protective mask is small, there will be no obvious discomfort even if it is worn for a long time. For individuals who do not need to move frequently in the clean micro-space, they have lower requirements for mobility flexibility. In this way, they can wear a breathing mask connected to the device. This diversified supply method obviously meets the diversified air supply needs of individuals underground.By setting up the cyclone separator, the large particles in the fresh air can be separated from the airflow by the centrifugal principle, so that these large-size particles will not enter the subsequent filter, ensuring the filtering efficiency of the subsequent filter. At the same time, it is helpful to avoid the situation of excessive wind resistance or blockage caused by large particles adhering to the filter. While ensuring the air supply efficiency, it can also help reduce the maintenance frequency of the filter mechanism. The sieve hole diameter of the front filter screen is made larger than the sieve hole diameter of the middle filter screen. The front filter screen can be used to intercept and filter out particles with smaller particle sizes, and then the middle filter screen can be used to intercept and filter out particles with fine particle sizes. In this way, it is ensured that particles with smaller particle sizes will not directly enter the middle filter screen, and that particles with fine particle sizes will not directly enter the high-precision composite filter mechanism, thereby ensuring the filtering effect and filtering efficiency of the middle filter screen on particles with fine particle sizes, and at the same time, ensuring the filtering effect and filtering efficiency of the high-precision composite filter mechanism on ultrafine particles. The air purifier is provided with a cyclone separator, a front filter screen, a middle filter screen and a high-precision composite filter mechanism from the air inlet side to the air outlet side. Through the four-fold progressive graded deep purification technology, namely "primary interception-pre-filtration-strong filtration-deep purification", the particles of different particle sizes in the air flow can be fully filtered step by step, ensuring that various particles in the air can be filtered out layer by layer from large to small, significantly improving the air purification effect, thereby achieving the purpose of deep purification and effectively protecting the health of breathing individuals. Through the setting of the CO elimination component, carbon monoxide in the filtered airflow can be effectively removed, thereby avoiding carbon monoxide poisoning of underground workers. Installing the ultra-clean fresh air monitoring component on the downstream side of the air purifier can facilitate the monitoring of the quality of the filtered fresh air, and thus timely discover the situation where the quality of the filtered fresh air is unqualified. Setting the temperature and humidity monitoring module, the particle concentration monitoring module and the multi-dimensional air pollutant monitoring module in the ultra-clean fresh air monitoring component can comprehensively and reliably monitor the quality of the fresh air, thereby effectively ensuring the quality of the fresh air supplied to the breathing individuals. Setting a processing module and an alarm module in the ultra-clean fresh air monitoring component is conducive to timely alarm action in the control alarm module when the monitoring data exceeds the monitoring threshold, which can remind relevant personnel to check and repair the air purifier or air source in time. At the same time, it can also help managers to find out the situation of excessive dangerous gases in time, which can help avoid the occurrence of safety accidents. By setting a one-way valve in the protective air supply pipeline, it can ensure that the deeply purified air in the branch ventilation duct can only be output to the outside in one direction, and the air near the excavation face or working face will not enter the branch ventilation duct through the protective air supply pipeline. Thus, the problem of air pollution caused by backflow is avoided, and the safety and reliability of the device are further improved. By setting a flow pump, a suitable negative pressure can be provided for the protective air supply pipeline, which is conducive to introducing the deeply purified airflow in the branch ventilation duct into the breathing mask.Through the control of the flow controller, the air flow in the protective air supply duct can be easily adjusted and monitored in real time, so as to provide an appropriate amount of clean air according to the actual needs of the workers, avoid insufficient or excessive air supply, and ensure the breathing comfort and safety of individual users.

[0028] The device is easy to operate, simple to maintain, has an ideal filtering effect, good stability, good flexibility, high versatility, and can flexibly adapt to different working environments. Through the use of this device, it can reliably provide clean air supply for underground working faces, significantly improve the air quality in the working area, and meet the diverse air supply needs of individuals working underground, providing reliable health protection for workers working underground, and helping to improve safety during the operation process.

[0029] The present invention also provides a method for supplying purified air to an underground working surface, using a purified air supply device for an underground working surface, comprising the following steps: Step 1: Use the wind source monitoring module 1 35 to monitor the fresh air quality on the upstream side of the main fan 1, and send the collected CO concentration signal A, NO concentration signal A, CH4 concentration signal A, CO2 concentration signal A and TVOC concentration signal A to the controller, the controller obtains CO concentration data A, NO concentration data A, CH4 concentration data A, CO2 concentration data A and TVOC concentration data A according to the CO concentration signal A, NO concentration signal A, CH4 concentration signal A, CO2 concentration data A and TVOC concentration data A, and obtains fresh air quality data 1 on the upstream side of the main fan 1 according to the CO concentration data A, NO concentration data A, CH4 concentration data A, CO2 concentration data A and TVOC concentration data A; The wind source monitoring module 2 36 is used to monitor the fresh air quality on the upstream side of the auxiliary ventilator 2, and the collected CO concentration signal B, NO concentration signal B, CH4 concentration signal B, CO2 concentration signal B and TVOC concentration signal B are sent to the controller, and the controller obtains CO concentration data B, NO concentration data B, CH4 concentration data B, CO2 concentration data B and TVOC concentration data B according to the CO concentration signal B, NO concentration signal B, CH4 concentration data B, CO2 concentration data B and TVOC concentration data B, and obtains fresh air quality data 2 on the upstream side of the auxiliary ventilator 2 according to the CO concentration data B, NO concentration data B, CH4 concentration data B, CO2 concentration data B and TVOC concentration data B; When the main fan 1 fails, or the fresh air quality data 2 is better than the fresh air quality data 1, the controller controls the main fan 1 to stop, controls the main air damper 6 to close, controls the auxiliary fan 2 to start, controls the auxiliary air damper 18 to open, and uses the auxiliary fan 2 to supply fresh air to the main ventilation duct 1, and executes step 2; when the auxiliary fan 2 fails, or the fresh air quality data 1 is better than the fresh air quality data 2, the controller controls the auxiliary fan 2 to stop, controls the auxiliary air damper 18 to close, controls the main fan 1 to start, controls the main air damper 6 to open, and reuses the main fan 1 to supply fresh air to the main ventilation duct 1, fresh air is supplied to the auxiliary fan 2, and step 2 is executed; when the main fan 1 and the auxiliary fan 2 are both normal, and the fresh air quality data 1 is equal to the fresh air quality data 2, the current air supply state is kept unchanged; when the main fan 1 and the auxiliary fan 2 are both faulty, or the fresh air quality data 1 and the fresh air quality data 2 are both over-polluted and cannot meet the normal air supply requirements, the controller controls the main fan 1 to stop, controls the main air door 6 to close, controls the auxiliary fan 2 to stop, controls the auxiliary air door 18 to stop, and sends an alarm signal to the remote alarm terminal connected thereto to remind relevant personnel to handle it in time; Step 2: According to the air supply demand, the branch damper 20 in the corresponding fresh air supply mechanism 19 is controlled to open, and the air purifier 3 is controlled to start working, so that the fresh air in the main ventilation duct 4 enters the corresponding branch ventilation duct 5 through the branch damper 20, and the front filter screen 22, the middle filter screen 23, and the high-precision composite filter mechanism 24 in the air purifier 3 are used to deeply filter the dust particles of the incoming fresh air. At the same time, the CO elimination component 39 is used to remove carbon monoxide in the filtered fresh air to achieve deep purification of the fresh air, and then the deeply purified fresh air is guided to the excavation face 14 or the working face 15 through the branch ventilation duct 5 to supply the purified fresh air; During the deep purification operation, large particles in the fresh air are separated by the cyclone separator 21 and discharged to the outside of the branch ventilation duct 5, the front filter screen 22 is used to filter the larger particles in the fresh air, the middle filter screen 23 is used to filter the fine particles in the fresh air, and the high-precision composite filter mechanism 24 is used to filter the ultrafine particles in the fresh air; During the air supply operation, the jet and diffusion effect of the deeply purified fresh air blown out at high speed from the outlet end of the branch ventilation duct 5 is utilized to form a relatively clean microspace 16 in the relatively open space near the excavation face 14 or the working face 15, and the polluted air flow in the excavation face 14 or the working face 15 is blown into the air supply tunnel; at the same time, the ultra-clean fresh air monitoring component 7 is used to monitor and warn the quality of the fresh air after deep purification. Specifically, the temperature and humidity signals at the location are collected through the temperature and humidity monitoring module and sent to the processing module, the particle concentration signal at the location is collected through the particle concentration monitoring module and sent to the processing module, and the CO concentration signal 1, NO concentration signal 1, CH4 concentration signal 1, CO2 concentration signal 1 and TVOC concentration signal 1 at the location are collected through the multi-dimensional air pollutant monitoring module and sent to the processing module; the processing module obtains the temperature and humidity signals according to the temperature and humidity signals, the particle concentration signals, the CO concentration signal 1, the NO concentration signal 1, the CH4 concentration signal 1, the CO2 concentration signal 1 and the TVOC concentration signal 1. Data, particulate matter concentration data, CO concentration data one, NO concentration data one, CH4 concentration data one, CO2 concentration data one and TVOC concentration data one, and are respectively proportional to the corresponding temperature and humidity thresholds, particulate matter concentration thresholds, CO concentration threshold one, NO concentration threshold one, CH4 concentration threshold one, CO2 concentration threshold one and TVOC concentration threshold one. When any monitoring value exceeds the monitoring threshold, the processing module controls the alarm module to perform an alarm action. At the same time, the processing module sends an alarm signal to the controller. When the controller receives the alarm signal, it controls the branch damper 20 in the fresh air supply mechanism 19 to close, stops the air supply operation, and sends an alarm signal to the remote alarm terminal connected thereto to remind relevant personnel to handle it in time; at the same time, the flow pump 10 in the corresponding individual clean air supply unit 12 is controlled to start according to individual needs, and a part of the deeply purified fresh air is drained into the protective air supply pipeline 18 by using the negative pressure provided by the flow pump 10, and then transported to the breathing mask 11 worn by the individual user; Synchronously, the wind source monitoring module 1 35 is used to monitor the fresh air quality on the upstream side of the main fan 1. When the main fan 1 fails, or the fresh air quality data 2 is better than the fresh air quality data 1, the controller controls the main fan 1 to stop, controls the main damper 6 to close, controls the auxiliary fan 2 to start, controls the auxiliary damper 18 to open, and uses the auxiliary fan 2 to supply fresh air to the main ventilation duct 1; when the auxiliary fan 2 fails, or the fresh air quality data 1 is better than the fresh air quality data 2, the controller controls the auxiliary fan 2 to stop, controls the auxiliary damper 18 to close , control the main fan 1 to start, control the main damper 6 to open, and reuse the main fan 1 to supply fresh air to the main ventilation duct 1; when both the main fan 1 and the auxiliary fan 2 fail, or the fresh air quality data 1 and the fresh air quality data 2 cannot meet the normal air supply requirements, the controller controls the main fan 1 to stop, controls the main damper 6 to close, controls the auxiliary fan 2 to stop, controls the auxiliary damper 18 to stop, controls the branch damper 20 to close, stops the air supply operation, and sends an alarm signal to the remote alarm terminal connected to it, so as to remind relevant personnel to deal with it in time.

[0030] As a preference, in step 2, the user adjusts the flow controller 9 according to his / her own situation to obtain an air flow supply flow that meets his / her needs.

[0031] In the present invention, during the operation of the ventilator, the fresh air quality on the upstream side of the main ventilator is monitored by using the wind source monitoring module 1, and the fresh air quality on the upstream side of the auxiliary ventilator is monitored by using the wind source monitoring module 2, so that the fresh air quality data 1 on the upstream side of the main ventilator and the fresh air quality data 2 on the upstream side of the auxiliary ventilator can be obtained respectively, and then the power source and the wind source can be conveniently switched according to the quality of the fresh air quality data or the failure of the two ventilators, thereby ensuring the stable and reliable operation of the entire device. During the operation of the fresh air supply mechanism, the jet and diffusion effect of the deep purified fresh air blown out at high speed at the outlet end of the branch ventilation duct are used to form a relatively clean micro space in the relatively open space near the excavation face or the working face, and the dust concentration within the range of personnel activities can be reduced by the micro space purification technology, so as to further improve the health protection of the operators. In this way, the operators are allowed to use protective masks with less breathing resistance and lower filtering standards in the clean micro space, which is conducive to the personnel in the clean micro space to move and work more flexibly. Through the formation of the clean micro space, the diversified needs of underground air supply are met, and different solutions are provided for the underground air supply technology. The negative pressure provided by the flow pump is used to guide the fresh air into the breathing mask. The flow rate of the flow pump itself can be used to effectively balance the flow rate of the airflow, which can help improve the comfort during breathing. During the deep purification process, the cyclone separator is used to separate the large particles in the fresh air, so that these large-size particles will not enter the subsequent filter net, ensuring the filtration efficiency of the subsequent filter net. At the same time, it is helpful to avoid excessive wind resistance or blockage caused by large particles adhering to the filter net. While ensuring the air supply efficiency, it can also help reduce the maintenance frequency of the filter mechanism. The air purifier is provided with a cyclone separator, a front filter screen, a middle filter screen, a high-precision composite filter mechanism and a CO elimination component from the air inlet side to the air outlet side. The four-fold progressive graded deep purification technology, namely "primary interception-pre-filtration-strong filtration-deep purification", can be used to fully filter particles of different particle sizes in the air flow step by step, ensuring that various particles in the air can be filtered out layer by layer from large to small, significantly improving the air purification effect. The CO elimination component is then used to remove carbon monoxide from the filtered fresh air, achieving the purpose of deep purification and effectively protecting the health of the breathing individual. In the air supply process, the ultra-clean fresh air monitoring component is used to monitor and warn the quality of the fresh air after deep purification, so that the deterioration of the fresh air quality can be discovered in time. When the deterioration of the fresh air quality is discovered, the alarm module is controlled to perform an alarm action. At the same time, an alarm signal is sent to the controller, which can facilitate the automatic stop of the air supply operation, thereby avoiding the supply of toxic and harmful gases to the workers, further ensuring the reliability and safety of the device.

[0032] This method has a high degree of automation, good safety and high reliability. It can stably provide purified fresh air supply services for underground working spaces and individuals, and can meet diversified air supply needs. It can effectively protect the personal health and safety of underground workers and help improve the safety factor of underground operations.

Claims

1. A purified air supply device for an underground working face, comprising a main ventilation duct (4), wherein the air inlet end of the main ventilation duct (4) starts from the main ventilation shaft or the main air tunnel at the entrance of the mine, and the air outlet end thereof extends along the length direction of the air supply tunnel; It is characterized in that It also includes a main ventilator (1), a main damper (6), an auxiliary ventilation duct (17), an auxiliary ventilator (2), an auxiliary damper (18), a first wind source monitoring module (35), a second wind source monitoring module (36), a fresh air supply mechanism (19), and a controller; The main fan (1) is installed at the inlet end of the air inlet section of the main ventilation duct (4); the main air door (6) is located on the downstream side of the main fan (1) and is installed in the middle of the air inlet section of the main ventilation duct (4); The air inlet end of the auxiliary ventilation duct (17) starts from the secondary ventilation shaft or the secondary air tunnel at the mine entrance, and the air outlet end thereof is connected to the outlet end of the air inlet section of the main ventilation duct (4); The auxiliary ventilator (2) is installed at the inlet end of the air inlet section of the auxiliary ventilation duct (17); the auxiliary damper (18) is located on the downstream side of the auxiliary ventilator (2) and is installed in the middle section of the auxiliary ventilation duct (17); The wind source monitoring module 1 (35) is located on the upstream side of the main ventilation fan (1) and is installed at the air inlet end of the main ventilation duct (4); the wind source monitoring module 1 (35) is internally integrated with a CO sensor A, a NO sensor A, a CH4 sensor A, a CO2 sensor A and a TVOC sensor A, and is used to collect a CO concentration signal A, a NO concentration signal A, a CH4 concentration signal A, a CO2 concentration signal A and a TVOC concentration signal A at the location; The wind source monitoring module 2 (36) is located at the upstream side of the auxiliary ventilator (2) and is installed at the air inlet end of the auxiliary ventilation duct (17); the wind source monitoring module 2 (36) is internally integrated with a CO sensor B, a NO sensor B, a CH4 sensor B, a CO2 sensor B and a TVOC sensor B, and is used to collect a CO concentration signal B, a NO concentration signal B, a CH4 concentration signal B, a CO2 concentration signal B and a TVOC concentration signal B at the location; A plurality of fresh air supply mechanisms (19) are respectively distributed in a plurality of excavation tunnels connected to the air supply tunnels, the fresh air supply mechanisms (19) comprising a branch ventilation duct (5), a branch air door (20), an air purifier (3), an ultra-clean fresh air monitoring component (7) and an individual clean air supply unit (12); The branch ventilation duct (5) extends along the length direction of the excavation tunnel, its air inlet end is connected to the main ventilation duct (4), and its air outlet end extends to the vicinity of the excavation face (14) or the working face (15), and is an open structure; The branch damper (20) is installed at the inlet end of the air inlet section of the branch ventilation duct (5); The air purifier (3) is connected in series to the air inlet section of the branch ventilation duct (5) and is located on the downstream side of the branch air door (20); the air purifier (3) comprises an outer shell (25), a cyclone separator (21), a front filter screen (22), a middle filter screen (23), a high-precision composite filter mechanism (24) and a CO elimination component (39); both left and right ends of the outer shell (25) are open structures, serving as a purified air inlet and a purified air outlet respectively; the cyclone separator (21) is installed at The outer shell (25) is provided with a purification air inlet; the front filter screen (22) and the middle filter screen (23) are respectively installed inside the left section and the middle section of the outer shell (25), and the sieve hole diameter of the middle filter screen (23) is smaller than the sieve hole diameter of the front filter screen (22); the outer diameter of the high-precision composite filter mechanism (24) is the same as the inner diameter of the outer shell (25), and is installed inside the right section of the outer shell (25); the CO elimination component (39) is installed in the purification air outlet of the outer shell (25); The ultra-clean fresh air monitoring component (7) is installed on the branch ventilation duct (5) and is located on the downstream side of the air purifier (3); the ultra-clean fresh air monitoring component (7) comprises a temperature and humidity monitoring module, a particle concentration monitoring module, a multi-dimensional air pollutant monitoring module, an alarm module and a processing module, and the processing module is respectively connected to the temperature and humidity monitoring module, the particle concentration monitoring module, the multi-dimensional air pollutant monitoring module and the alarm module; the temperature and humidity monitoring module, the particle concentration monitoring module and the multi-dimensional air pollutant monitoring module are located inside the branch ventilation duct (5), and the alarm module and the processing module are located outside the branch ventilation duct (5); the temperature and humidity monitoring module is used to The temperature and humidity signals at the location are collected. The particle concentration monitoring module is used to collect the particle concentration signal at the location. The multi-dimensional air pollutant monitoring module is internally integrated with a CO sensor, a NO sensor, a CH4 sensor, a CO2 sensor, and a TVOC sensor, and is used to collect a CO concentration signal, a NO concentration signal, a CH4 concentration signal, a CO2 concentration signal, and a TVOC concentration signal at the location; the processing module is used to obtain corresponding monitoring data according to the received monitoring signal, and compare it with the corresponding monitoring threshold, and control the alarm module to perform an alarm action when the monitoring data exceeds the monitoring threshold; The number of the individual clean air supply units (12) is one or more, and the individual clean air supply units (12) include a protective air supply pipeline (8), a one-way valve (13), a flow pump (10), a flow controller (9) and a breathing mask (11); the air inlet end of the protective air supply pipeline (8) is located at the downstream side of the ultra-clean fresh air monitoring component (7) and is connected to the branch ventilation duct (5) in a through-connected manner, and the air outlet end thereof extends to the individual activity space located near the excavation face (14) or the working face (15); the one-way valve (13), the flow pump (10) and the flow controller (9) are connected in series on the protective air supply pipeline (8) in sequence from the air inlet side to the air outlet side, and the breathing mask (11) is connected to the air outlet end of the protective air supply pipeline (8) via a flexible connecting pipeline; The controller is respectively connected to the main damper (6), the auxiliary damper (18), the main ventilator (1), the auxiliary ventilator (2), the branch damper (20), the ultra-clean fresh air monitoring component (7), the wind source monitoring module 1 (35), the wind source monitoring module 2 (36), the cyclone separator (21) and the flow pump (10).

2. A purified air supply device for underground working surface according to claim 1, characterized in that: The breathing mask (11) comprises a mask body (26), a resonance component (31), an inhalation valve (30), a breathing valve, a hanging ear (33) and a hanging rope; The mask body (26) has a breathing cavity inside, and its rear side is an open structure adapted to the face, and the surrounding of the open part is made of silicone material; two mounting interfaces (32) connected to the breathing cavity are symmetrically provided on the upper front side of the mask body (26), an air outlet interface (27) connected to the breathing cavity is connected to the lower front side, an air inlet interface (28) connected to the breathing cavity is provided on the front side, and an air inlet grille (29) is installed inside the air inlet interface (28); the air inlet interface (28) is connected to the air outlet end of the protective air supply pipeline (8) through a flexible pipeline; Two resonance components (31) are correspondingly mounted in the two mounting interfaces (32), and the resonance components (31) are used to transmit the wearer's voice to the outside world by means of resonance; the inhalation valve (30) is mounted inside the air outlet interface (27); the breathing valve is mounted inside the air inlet interface (28) and is located on the inner side of the air inlet grille (29); two hanging ears (33) are symmetrically fixedly connected to the two sides of the rear outer wall of the mask body (26); and the two ends of the hanging rope are respectively connected to the hanging holes on the two hanging ears (33).

3. A purified air supply device for underground working surface according to claim 1 or 2, characterized in that: It also comprises an air outlet end plate (37); the air outlet end plate (37) is encapsulated at the air outlet end of the branch ventilation duct (5); a plurality of air outlet holes are provided on the air outlet end plate (37) over the entire surface thereof, and a plurality of conical nozzles (38) are connected to the positions of the plurality of air outlet holes on a side away from the branch ventilation duct (5); the conical nozzles (38) have a frustum-shaped inner cavity inside, and the large opening end of the frustum-shaped inner cavity is adapted to the aperture of the air outlet holes and are interconnected, and the small opening end of the frustum-shaped inner cavity is located on the side away from the air outlet holes.

4. A purified air supply device for underground working surface according to claim 1, characterized in that: A plurality of connection interfaces (34) for connecting to individual clean air supply units (12) are provided on the pipe body at the end of the branch ventilation duct (5), and a control valve is installed at the connection interface (34).

5. A purified air supply device for underground working surface according to claim 4, characterized in that: The branch ventilation duct (5) is installed on the top of the excavation tunnel.

6. A method for supplying purified air to an underground working surface, using a purified air supply device for an underground working surface as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Use the wind source monitoring module 1 (35) to monitor the fresh air quality on the upstream side of the main ventilation fan (1), and send the collected CO concentration signal A, NO concentration signal A, CH4 concentration signal A, CO2 concentration signal A and TVOC concentration signal A to the controller, the controller obtains CO concentration data A, NO concentration data A, CH4 concentration data A, CO2 concentration data A and TVOC concentration data A according to the CO concentration signal A, NO concentration signal A, CH4 concentration signal A, CO2 concentration data A and TVOC concentration data A, and obtains fresh air quality data 1 on the upstream side of the main ventilation fan (1) according to the CO concentration data A, NO concentration data A, CH4 concentration data A, CO2 concentration data A and TVOC concentration data A; The wind source monitoring module 2 (36) is used to monitor the fresh air quality on the upstream side of the auxiliary ventilator (2), and the collected CO concentration signal B, NO concentration signal B, CH4 concentration signal B, CO2 concentration signal B and TVOC concentration signal B are sent to the controller. The controller obtains CO concentration data B, NO concentration data B, CH4 concentration data B, CO2 concentration data B and TVOC concentration data B according to the CO concentration signal B, NO concentration signal B, CH4 concentration data B, CO2 concentration data B and TVOC concentration data B, and obtains fresh air quality data 2 on the upstream side of the auxiliary ventilator (2) according to the CO concentration data B, NO concentration data B, CH4 concentration data B, CO2 concentration data B and TVOC concentration data B; When the main ventilator (1) fails, or the fresh air quality data 2 is better than the fresh air quality data 1, the controller controls the main ventilator (1) to stop, controls the main air damper (6) to close, controls the auxiliary ventilator (2) to start, controls the auxiliary air damper (18) to open, and uses the auxiliary ventilator (2) to supply fresh air to the main ventilation duct (1), and executes step 2; when the auxiliary ventilator (2) fails, or the fresh air quality data 1 is better than the fresh air quality data 2, the controller controls the auxiliary ventilator (2) to stop, controls the auxiliary air damper (18) to close, controls the main ventilator (1) to start, controls the main air damper (6) to open, and uses the main ventilator (1) to supply fresh air to the main ventilation duct (1). Fresh air is supplied to the ventilation duct (1), and step 2 is executed; when the main ventilation fan (1) and the auxiliary ventilation fan (2) are both normal, and the fresh air quality data 1 is equal to the fresh air quality data 2, the current air supply state is maintained unchanged; when the main ventilation fan (1) and the auxiliary ventilation fan (2) both fail, or the fresh air quality data 1 and the fresh air quality data 2 are both over-polluted and cannot meet the normal air supply requirement, the controller controls the main ventilation fan (1) to stop, controls the main air damper (6) to close, controls the auxiliary ventilation fan (2) to stop, controls the auxiliary air damper (18) to stop, and sends an alarm signal to a remote alarm terminal connected thereto, so as to remind relevant personnel to handle it in time; Step 2: According to the air supply demand, the branch damper (20) in the corresponding fresh air supply mechanism (19) is controlled to open, and the air purifier (3) is controlled to start working, so that the fresh air in the main ventilation duct (4) enters the corresponding branch ventilation duct (5) through the branch damper (20), and the front side filter screen (22), the middle filter screen (23), and the high-precision composite filter mechanism (24) in the air purifier (3) are used to perform a deep filtration operation on the incoming fresh air to remove dust particles. At the same time, the CO elimination component (39) is used to remove carbon monoxide in the filtered fresh air to achieve a deep purification operation of the fresh air, and then the deeply purified fresh air is guided to the excavation face (14) or the working face (15) through the branch ventilation duct (5) to perform an air supply operation of the purified fresh air; During the deep purification operation, large particles in the fresh air are separated by a cyclone separator (21) and discharged to the outside of the branch ventilation duct (5), the larger particles in the fresh air are filtered by the front filter screen (22), the fine particles in the fresh air are filtered by the middle filter screen (23), and the ultrafine particles in the fresh air are filtered by the high-precision composite filter mechanism (24); During the air supply operation, the jet and diffusion effect of the deeply purified fresh air blown out at high speed from the outlet end of the branch ventilation duct (5) is utilized to form a relatively clean micro space (16) in a relatively open space near the excavation face (14) or the working face (15), and the polluted air flow in the excavation face (14) or the working face (15) is blown into the air supply tunnel; at the same time, the ultra-clean fresh air monitoring component (7) is used to monitor and warn the quality of the fresh air after deep purification. Specifically, the temperature and humidity signals at the location are collected by the temperature and humidity monitoring module and sent to the processing module; the particle concentration signal at the location is collected by the particle concentration monitoring module and sent to the processing module; the CO concentration signal 1, NO concentration signal 1, CH4 concentration signal 1, CO2 concentration signal 1 and TVOC concentration signal 1 at the location are collected by the multi-dimensional air pollutant monitoring module and sent to the processing module; the processing module obtains the temperature and humidity signals according to the temperature and humidity signals, the particle concentration signals, the CO concentration signal 1, the NO concentration signal 1, the CH4 concentration signal 1, the CO2 concentration signal 1 and the TVOC concentration signal 1. data, particulate matter concentration data, CO concentration data 1, NO concentration data 1, CH4 concentration data 1, CO2 concentration data 1 and TVOC concentration data 1, and are respectively proportional to the corresponding temperature and humidity thresholds, particulate matter concentration thresholds, CO concentration threshold 1, NO concentration threshold 1, CH4 concentration threshold 1, CO2 concentration threshold 1 and TVOC concentration threshold 1. When any of the monitored values ​​exceeds the monitoring threshold, the processing module controls the alarm module to perform an alarm action. At the same time, the processing module sends an alarm signal to the controller. When the controller receives the alarm signal, it controls the branch damper (20) in the fresh air supply mechanism (19) to close, stops the air supply operation, and sends an alarm signal to the remote alarm terminal connected thereto to remind relevant personnel to handle it in time. At the same time, according to individual needs, the flow pump (10) in the corresponding individual clean air supply unit (12) is controlled to start, and the negative pressure provided by the flow pump (10) is used to guide a part of the deeply purified fresh air into the protective air supply pipeline (18), and then transport it to the breathing mask (11) worn by the individual user; Synchronously, the air source monitoring module 1 (35) is used to monitor the quality of fresh air on the upstream side of the main ventilation fan (1). When the main ventilation fan (1) fails, or the fresh air quality data 2 is better than the fresh air quality data 1, the controller controls the main ventilation fan (1) to stop, controls the main air door (6) to close, controls the auxiliary ventilation fan (2) to start, controls the auxiliary air door (18) to open, and uses the auxiliary ventilation fan (2) to supply fresh air to the main ventilation duct (1); when the auxiliary ventilation fan (2) fails, or the fresh air quality data 1 is better than the fresh air quality data 2, the controller controls the auxiliary ventilation fan (2) to stop, controls the auxiliary air door (18) to close, and controls the auxiliary air door (18) to open. The controller controls the main fan (1) to start, controls the main damper (6) to open, and reuses the main fan (1) to supply fresh air to the main ventilation duct (1); when both the main fan (1) and the auxiliary fan (2) fail, or the fresh air quality data 1 and the fresh air quality data 2 cannot meet the normal air supply requirements, the controller controls the main fan (1) to stop, controls the main damper (6) to close, controls the auxiliary fan (2) to stop, controls the auxiliary damper (18) to stop, controls the branch damper (20) to close, stops the air supply operation, and sends an alarm signal to the remote alarm terminal connected thereto, so as to remind relevant personnel to handle it in time.

7. A method for supplying purified air to an underground working surface according to claim 6, characterized in that: In step 2, the user adjusts the flow controller (9) according to his / her own situation to obtain an air flow supply flow that meets his / her needs.

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