A coal mine underground drainage device based on fluid-structure interaction

Abstract

The present invention provides a coal mine underground drainage device based on fluid-structure interaction, including a filtering device and a water pump. The filtering device includes: a cylindrical outer housing, two first channels are arranged on opposite sides inside the outer housing, a first valve body is arranged at one end of the two first channels in the same direction, and the two first valve bodies are configured to alternately open the ends of the first channels. First check valves are arranged at the other ends of the two first channels. Along the extending direction of the first channels, first liquid passing ports are arranged in the middle regions of the side walls of the two first channels, and each first liquid passing port is configured with a filtering element; an arc-shaped second channel is arranged between the two first channels and both ends are communicated with the two first liquid passing ports; two third channels, one ends of the two third channels are communicated with each other. Through this setting method, the filtering element can be automatically cleaned under the interaction of water flow and the second guiding channel and the third guiding channel, avoiding the use of electronic control components such as sensors and improving reliability.

Description

Technical Field

[0001] The present invention generally relates to the technical field of coal mine drainage equipment, and particularly relates to a coal mine underground drainage device based on fluid-structure interaction. Background Art

[0002] A coal mine is an area where humans extract coal resources in coal-rich mining areas, generally divided into underground coal mines and surface coal mines. When the coal seam is far from the surface, generally, underground roadways are dug to extract coal, which is an underground coal mine. When the coal seam is very close to the surface, generally, the surface soil layer is directly stripped to excavate coal, which is a surface coal mine. Most coal mines in China are underground coal mines. The scope of a coal mine includes a large area above and below the ground and related facilities. A coal mine is a reasonable space excavated by humans when opening up a coal-rich geological layer, usually including roadways, shafts, and working faces, etc.

[0003] The underground drainage system of a coal mine shaft is an essential and important device for the safe production of the mine. Since the water contains a certain amount of coal slag, directly draining the water through the drainage device will discharge the coal slag in the water, resulting in a large coal consumption and even causing a certain degree of environmental pollution. Moreover, during the continuous drainage process, the coal slag in the water will form a certain degree of precipitation. For long-term drainage, the precipitate needs to be cleaned up. Otherwise, it will affect the drainage process and reduce the drainage efficiency. Based on the above problems, the Chinese invention patent with the application number: CN202110536743.0 provides a name: an intelligent mine drainage system. By setting structures such as a water storage tank and a slag storage tank, it can filter the water discharged from the coal mine, thereby removing the precipitate inside the water and avoiding the precipitate from affecting the drainage efficiency. However, when it works, it needs to measure the water level through a water level sensor and needs to control the stop and operation of the drainage device according to the change of the water level in the water storage tank to achieve the slag cleaning work. The work is not convenient enough, and in the harsh underground environment, it is easy to malfunction through the electric control method, and the maintenance is inconvenient, and the work reliability is not high. Summary of the Invention

[0004] In view of the above problems, the present application provides a coal mine underground drainage device based on fluid-structure interaction. It automatically performs slag cleaning work through the fluid-structure interaction method. Since it uses the energy generated by the water flow to clean the slag and does not need to additionally use liquid level detection and control devices, it can avoid using electronic control components such as sensors and improve the reliability.

[0005] The present invention provides a coal mine underground drainage device based on fluid-structure interaction. The device includes a filtering device and a water pump. The filtering device includes:

[0006] A cylindrical outer casing, with two first channels provided on opposite sides within the outer casing. At one end of the two first channels in the same direction, there is a first valve body. The two first valve bodies are configured to alternately open the ends of the first channels. At the other end of each of the two first channels, there is a first one-way valve configured to allow the flowing medium to flow out of the first channel unidirectionally. Along the extending direction of the first channels, in the middle region of the side walls of the two first channels, there is a first liquid passage opening, and each first liquid passage opening is provided with a filter element;

[0007] An arc-shaped second channel, arranged between the two first channels and communicating with the two first liquid passage openings at both ends;

[0008] Two third channels, with one end of the two third channels communicating with each other.

[0009] Further, the first valve body includes a first rotating shaft rotatably arranged at the opening position of the first channel, a first valve plate arranged on the first rotating shaft, and a limiting surface arranged on the side of the opening of the first channel away from the first rotating shaft. The two first rotating shafts are arranged in parallel, and there is a rigid connecting rod between the two first rotating shafts. The two ends of the connecting rod are respectively hinged to the two first rotating shafts, and at least one of the two first rotating shafts is provided with a first torsion spring between it and the outer casing. Under the elastic force of the first torsion spring, one first valve plate is separated from the limiting surface, and the other first valve plate contacts the limiting surface.

[0010] Further, the first valve plate is located on the side of the limiting surface closer to the other end of the first channel.

[0011] Further, the arc-shaped second channel is bent in a direction away from the third channel.

[0012] Further, at one end of each of the third channels connected to the second channel and the first liquid passage opening, there is a second valve body; the second valve bodies provided in each of the third channels are configured such that when the first valve body provided on the corresponding first channel of the third channel is open, the second valve body provided on the third channel is closed, and when the first valve body provided on the corresponding first channel of the third channel is closed, the second valve body provided on the third channel is open.

[0013] Further, the second valve body includes a second rotating shaft arranged on the side where the third channel is connected to the first channel and a second valve plate arranged on the second rotating shaft. There is a second torsion spring between the second rotating shaft and the outer side wall of the third channel, so that the second valve plate is in an open state against the filter element in the free state.

[0014] Further, a valve assembly is provided on the side of each of the third channels away from the second channel of the second valve body, and the valve assembly is configured to alternately switch between an open state and a closed state when there is a liquid flow passing through.

[0015] Further, the valve assembly includes a partition plate disposed perpendicular to the flow direction of the third channel, at least one valve passage provided on the partition plate, a guide cylinder disposed on one side of the partition plate and coaxially arranged with the valve passage, a rigid guide rod guidingly disposed in the guide cylinder, a limiting plate provided on the rigid guide rod, a third valve plate adapted to the valve passage provided on the side of the partition plate close to the second channel, the end of the rigid guide rod being connected to the third valve plate, and a first elastic member is provided between the guide rod and the guide cylinder. Under the elastic force of the first elastic member, the limiting plate abuts against the end of the guide cylinder for limiting, and the third valve plate is in an open state spaced from the valve passage.

[0016] Further, one ends of the two third channels away from the second channel are both communicated with a drain pipe. A limiting assembly is provided between the guide cylinder and the guide rod, and the limiting assembly is configured to have a first state of limiting the rigid guide rod and the guide cylinder to the state where the limiting plate abuts against the end of the guide cylinder and a second state of releasing the rigid guide rod and the guide cylinder. The limiting assembly is configured with a transmission shaft, and the drain pipe is provided with a drive shaft parallel to the transmission shaft. First bevel gears for transmission are provided at the ends of the transmission shaft and the drive shaft. A piston cylinder is provided on the side wall of the first channel corresponding to the third channel. The piston cylinder extends into the first channel and is open at one end and communicated with the other first channel at the other end. A piston is provided in the piston cylinder, a rigid rod is coaxially provided on the piston, and an intermediate bevel gear is provided at the end of the rigid rod by a rotating shaft. The rigid rod is parallel to the transmission shaft and is located between the transmission shaft and the drive shaft.

[0017] Further, the drive shaft vertically penetrates through the drain pipe, and a drive impeller is provided in the drain pipe. The drive shaft is drivingly connected to the drive impeller.

[0018] Beneficial effects

[0019] The present invention provides a coal mine underground drainage device based on fluid-structure interaction. The device includes a filtering device and a water pump. The filtering device includes: a cylindrical outer housing, two first channels are arranged on opposite sides inside the outer housing, a first valve body is arranged at one end of the two first channels in the same direction, and the two first valve bodies are configured to alternately open the ends of the first channels. A first one-way valve that allows the flowing medium to flow out of the first channel unidirectionally is arranged at the other end of the two first channels. Along the extending direction of the first channels, a first liquid passing port is arranged in the middle area of the side walls of the two first channels, and each first liquid passing port is configured with a filtering element; an arc-shaped second channel is arranged between the two first channels and both ends are communicated with the two first liquid passing ports; two third channels, one end of the two third channels is communicated with each other. Through this setting method, the filtering element can be automatically cleaned by the mutual coupling action of the water flow, the second guiding channel, and the third guiding channel, avoiding the use of electronic control components such as sensors and improving reliability. Description of the Drawings

[0020] Other features, objects, and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings.

[0021] Figure 1 It is a schematic structural diagram of the connection between the filtering device and the water pump in a coal mine underground drainage device based on fluid-structure interaction provided by the present invention.

[0022] Figure 2 For Figure 1 It is a schematic cross-sectional structural diagram of the filtering device A-A in a coal mine underground drainage device based on fluid-structure interaction provided by the present invention as shown.

[0023] Figure 3 For Figure 2 It is a schematic cross-sectional structural diagram of the B-B in a coal mine underground drainage device based on fluid-structure interaction provided by the present invention as shown.

[0024] Figure 4 For Figure 2 It is a schematic diagram of a partially enlarged structure at C in a coal mine underground drainage device based on fluid-structure interaction provided by the present invention as shown.

[0025] Figure 5 For Figure 4 It is a schematic diagram of a partially enlarged structure at D in a coal mine underground drainage device based on fluid-structure interaction provided by the present invention as shown.

[0026] Figure 6 It is a schematic diagram of a partially enlarged structure of the valve body assembly and the limit assembly in a coal mine underground drainage device based on fluid-structure interaction provided by the present invention.

[0027] Figure 7 For Figure 6 The schematic diagram of the partial enlarged structure at E in a coal mine underground drainage device provided by the present invention based on fluid-structure interaction as shown

[0028] Figure 8 For Figure 7 The schematic diagram of the structure of the sliding sleeve and the rotating sleeve in a coal mine underground drainage device provided by the present invention based on fluid-structure interaction as shown

[0029] Figure 9 The schematic diagram of the connection structure of two first valve bodies in a coal mine underground drainage device provided by the present invention based on fluid-structure interaction

[0030] Figure 10 The schematic diagram of the connection structure of the driving impeller and the driving shaft in a coal mine underground drainage device provided by the present invention based on fluid-structure interaction Specific embodiments

[0031] The following further elaborates on the present application in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention, rather than limiting the invention. Additionally, it should be noted that for the convenience of description, only the parts related to the invention are shown in the drawings

[0032] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will elaborate on the present application in detail with reference to the drawings and embodiments

[0033] Embodiment 1

[0034] The present invention provides a coal mine underground drainage device based on fluid-structure interaction. Referring to Figures 1 - 4 , as a specific implementation, the device includes a filtering device 1 and a water pump 2. The filtering device 1 includes:

[0035] A cylindrical outer shell 10, with two first channels 101 provided on opposite sides inside the outer shell 10. At the same-direction ends of the two first channels 101, there are first valve bodies 102 configured to alternately open the ends of the first channels 101. At the other ends of the two first channels 101, there are first one-way valves 103 configured to allow the flowing medium to flow out of the first channels 101 unidirectionally. Along the extending direction of the first channels, in the middle regions of the side walls of the two first channels, there are first liquid through-holes 104, and each first liquid through-hole 104 is provided with a filtering element 105

[0036] An arc-shaped second channel 11, provided between the two first channels and connected to the two first liquid through-holes 104 at both ends

[0037] Two third channels 12, one ends of the two third channels 12 communicate with each other.

[0038] Specifically, referring to Figures 1 - 4 , when the drainage device provided by the present invention is in use, the filtering device 1 is placed at the place where drainage is required underground in the coal mine, and then the water pump 2 is connected to the filtering device to pump water outwards. The water in the coal mine is filtered by the filtering device and then pumped out by the water pump. After being filtered by the filtering device, the coal slag in the water can be filtered out to avoid discharging the coal slag. The filtering principle of the filtering device is as follows, referring to Figure 2 , Figure 9 , the drain pipe 17 is connected to the water pump. When the water pump is not working, one of the two first valve bodies is in a closed state and the other is in an open state. As Figure 2 shown, the first valve body provided on the right first channel is in an open state, and the first valve body provided on the left first channel is in a closed state. At this time, when the water pump works, a suction effect is generated, and the water underground in the coal mine is sucked into the left first channel 101, then enters the second channel 11 through the right filter element 105, then enters the left third channel 12 through the second channel 11, passes through the third channel 12 and then enters the water pump 2 from the drain pipe 17. The water is pumped out by the water pump. Under the guidance of the second channel and the third channel, the water flow will change direction between the second channel and the third channel. Therefore, an impact effect will be generated on the filter element provided at the junction of the second channel and the third channel, which can achieve the effect of backwashing the filter element. At this time, if there is coal slag attached to the outer surface of the left filter element, it can achieve a cleaning effect, and the right filter element filters the coal slag, so that the right filter element is gradually blocked, and the water permeability of the right filter element becomes poor. At this time, the water pump continues to work, and the pressure in the left first channel becomes low under the action of the suction force, so that the two second valve bodies are switched under the action of negative pressure, the right first valve body is closed, and the left first valve body is opened. At this time, the water flow enters the left first channel, then enters the second channel 11 through the left filter element 15, and enters the right third channel 12 through the second channel 11. When the water flow enters the right third channel 12 from the second channel, the water flow changes direction, so that a backwashing effect is exerted on the right filter element 15, thereby being able to clean the right filter element. After the left filter element is blocked after pumping water for a period of time, the two first valve bodies are switched again, and so on. The purpose of automatically cleaning the filter element 15 can be achieved through the coupling action of the water flow and the second channel and the third channel; through the above solution, the filter element can be automatically cleaned by the water flow, thereby avoiding the use of electronic detection components and improving the reliability. The specific structure and working principle of the first valve body are referred to below, and the outer shell and the internal first channel, second channel, and third channel can be integrally formed by casting.

[0039] Further, as a specific implementation manner, refer to Figure 2 and Figure 9 . The specific structure of the first valve body and the connection manner of the two first valve bodies are as follows: The first valve body 102 includes a first rotating shaft 1020 rotatably disposed at the opening position of the first channel, a first valve plate 1021 disposed on the first rotating shaft 1020, and a limiting surface 1022 disposed on the side of the opening of the first channel away from the first rotating shaft. The two first rotating shafts 1020 are arranged in parallel, and a rigid connecting rod 1023 is disposed between the two first rotating shafts. The two ends of the connecting rod are respectively hinged to the two first rotating shafts 1020, and at least one of the two first rotating shafts 1020 is provided with a first torsion spring (not shown in the figure) between the housing. Under the elastic force of the first torsion spring, one of the first valve plates is separated from the limiting surface 1022, and the other first valve plate contacts the limiting surface 1022.

[0040] Specifically, refer to Figure 2 . The first torsion spring is an elastic member capable of providing rotational force around the axis to the first rotating shaft. As a specific implementation manner, when only the left first rotating shaft is provided with a first torsion spring, when the water pump is not working, under the elastic force of the first torsion spring, the left first valve plate 1021 abuts against the limiting surface 1022, thereby closing the left first valve passage. Under the action of the rigid connecting rod 1023, the right first rotating shaft is pushed to rotate, thereby driving the right first valve plate to open. At this time, when the water pump is turned on, the water flow will enter the right first channel, and the water flow will generate a pushing force on the right first valve plate, so that the right first valve plate will not be closed. Under the action of the rigid connecting rod 1023, the left first valve plate tightly blocks the left first channel; it can be understood that a first torsion spring can also be provided only on the right first rotating shaft. In this case, the first torsion spring provides an elastic force for the right first rotating shaft to rotate away from the limiting surface 1022, and under the pulling action of the rigid connecting rod 1023, the left first rotating shaft rotates, so that the left first valve plate contacts the left limiting surface and closes the left first channel.

[0041] Further, as a preferred implementation manner, refer to Figure 2 . The first valve plate 1021 is located on the side of the limiting surface 1022 close to the other end of the first channel. By this setting method, when the water flow enters the first valve passage, the water flow can push and limit the first valve plate, and it can also prevent the coal slag from flowing out of the first channel through the first valve plate again when the filter element is cleaned by reverse impact.

[0042] Further, as a specific implementation manner, the arc-shaped second channel 11 is bent away from the third channel 12. By this setting method, the two third channels can be arranged on the same side of the second channel, thereby simplifying the structure of the filtering device and reducing the volume of the filtering device.

[0043] Further, as a specific implementation manner, refer to Figure 2 , Figure 4 , Figure 5 , each end of each third channel 12 connected to the second channel 11 and the first liquid inlet 104 is provided with a second valve body 14; the second valve body 14 provided for each third channel is configured such that when the first valve body 102 provided on the first channel corresponding to the third channel 12 is opened, the second valve body provided for the third channel 12 is closed, and when the first valve body 102 provided on the first channel corresponding to the third channel 12 is closed, the second valve body provided for the third channel 12 is opened. Specifically, by providing the second valve body in the third channel 12, when the water flow flows from the first channel on the right side into the second channel, the second valve body 14 on the right side is closed, and the second valve body 14 on the left side is opened. At this time, the water flow will pass through the second channel and enter the third channel on the left side. Similarly, when the water flow flows from the first channel on the left side, the second valve body on the left side closes the third channel on the left side, and the second valve body on the right side opens the third channel on the right side, thereby achieving the purpose of guiding the water flow by the second channel and the third channel and achieving the purpose of cleaning the filter element.

[0044] Further, as a specific implementation manner, the specific structure and working principle of the second valve body are as follows: the second valve body 14 includes a second rotating shaft 141 provided on the side where the third channel is connected to the first channel and a second valve plate 142 provided on the second rotating shaft 141. A second torsion spring is provided between the second rotating shaft and the outer side wall of the third channel, so that the second valve plate abuts against the filter element 105 in the open state when in the free state.

[0045] Specifically, refer to Figure 4 , Figure 5 , Figure 4The second valve body on the left side shown is in the open state for opening the third channel 12 on the left side. When the water pump is not working, under the elastic force of the second torsion spring, the second valve bodies on both the left and right sides are in the open state. When the water pump is working, water flows into the first channel on the right side, then passes through the filter element 105 on the right side and enters the second channel. At this time, the water flow will push the second valve plate 142 on the right side, thereby driving the second rotating shaft 141 to rotate against the elastic force of the second torsion spring. Thus, under the pushing action of the water flow, the second valve plate 142 on the right side is opened, and the water flow enters the second channel under the guiding action of the second valve plate on the right side, and then enters the third channel. The second valve plate on the left side remains open under the elastic force of the second torsion spring.

[0046] Embodiment 2

[0047] The present invention provides a coal mine underground drainage device based on fluid-structure interaction. Refer to Figures 6 - 10 , as a specific implementation manner, the difference from Embodiment 1 is that further, a valve assembly 15 is provided on the side of each third channel 12 away from the second channel of the second valve body 14, and the valve assembly 15 is configured to alternately switch between the open and closed states when there is a liquid flow passing through.

[0048] Specifically, for the convenience of explanation, refer to Figure 1 、 Figure 4 , still taking the opening of the first valve body on the right side as an example. When the water pump is working, the water flow passes through the second channel and flows into the third channel on the left side, passes through the valve assembly 15 in the third channel, and then flows out from the drain pipe 17. At this time, the water flow in the second channel and the third channel has a certain inertia. During the flowing process, the valve assembly closes, and the water flow cannot pass through. At this time, the water flow in the second channel still flows into the third channel on the left side under the action of inertia, so that the water pressure in the left side of the second channel and the third channel on the left side rises, which can achieve a better cleaning effect on the filter element on the left side, and under the action of the impact force, the first one-way valve 103 in the first channel on the left side can be instantaneously opened, facilitating the discharge of the coal slag impurities cleaned from the left filter element 15 from the first channel on the left side; refer to Figure 1 , as a specific implementation manner, the specific structure of the first one-way valve may include a fourth rotating shaft 1031 rotatably arranged on the side wall of the first channel. A fourth torsion spring (not shown) is arranged between the fourth rotating shaft and the side wall of the first channel. A fourth valve plate 1032 is arranged on the fourth rotating shaft 1031. Under the elastic force of the fourth torsion spring, the fourth valve plate abuts against the end face of the first channel, thereby achieving the effect of one-way flow.

[0049] Further, refer to Figure 2 、 Figure 4 、 Figure 6, the specific structure of the valve assembly is as follows: The valve assembly 15 includes a partition plate 150 arranged perpendicular to the flow direction of the third channel 12, at least one valve passage 151 arranged on the partition plate 150, a guiding cylinder 152 arranged on one side of the partition plate and coaxially arranged with the valve passage, and a rigid guiding rod 153 guidingly arranged in the guiding cylinder 152. The rigid guiding rod is provided with a limiting plate 154. A third valve plate 155 adapted to the valve passage 151 is arranged on the side of the partition plate close to the second channel. The end of the rigid guiding rod 153 is connected to the third valve plate. A first elastic member 156 is arranged between the guiding rod 153 and the guiding cylinder 152. Under the elastic force of the first elastic member 156, the limiting plate 154 abuts against the end of the guiding cylinder 152 for limiting, and the third valve plate 155 is in an open state spaced from the valve passage.

[0050] Specifically, referring to Figure 4 , as a specific implementation manner, the guiding cylinder 152 is arranged on the side of the partition plate away from the second channel 11, the limiting plate 154 is arranged on the side of the guiding cylinder 152 away from the partition plate, and the first elastic member 156 is a first compression spring arranged between the third valve plate and the guiding cylinder. The working principle of the valve assembly 15 is as follows: Under the elastic force of the first compression spring, the third valve plate 155 is pushed to make the limiting plate abut against the end of the guiding cylinder 152. At this time, the third valve plate 155 is spaced from the partition plate, and the liquid flow can pass through the valve passage 151. As the liquid flow flows, it has an impact on the third valve plate, so that the third valve plate can be pushed to move against the elastic force of the first compression spring to block the valve passage 151, closing the valve assembly 15, so that the liquid flow cannot pass through the valve body assembly. At this time, the water flow in the second channel 11 moves into the third channel on the left under the action of inertia, thus impacting the filter element on the left. The water flow passes through the filter screen on the left and enters the first channel on the left, reducing the water pressure in the second channel and the third channel on the left. The third valve plate rebounds under the elastic force of the first compression spring and leaves the partition plate, so that the valve assembly 15 is opened again. In this way, the valve assembly alternates between the open and closed states, so as to achieve a better cleaning effect on the left filter element.

[0051] Further, as a preferred implementation manner, referring to Figure 6, the valve assembly 15 further includes a plurality of flow channels 1501 provided on the partition plate. The plurality of flow channels can be arranged around the valve channel 151, and the sum of the flow areas of the plurality of flow channels is smaller than the flow area of the valve channel 151. In this way, when the valve assembly is in the open state, the liquid passes through the valve channel and the flow channels 1501 through the partition plate. As the water flow velocity increases, under the impact of the water flow, the third valve plate blocks the valve channel, thereby reducing the flow rate of the valve assembly. At this time, the liquid flowing rapidly upstream of the partition plate still has inertia and can also play a role in impacting the filter element. By providing the flow channels, when the third valve plate blocks the valve channel, part of the liquid can still pass through the flow channels 1501, thereby reducing the negative pressure generated by the water pump suction. At this time, the impact force of the water flow on the third valve plate is reduced, which can accelerate the rebound speed of the third valve plate and improve the switching speed of the valve assembly, thereby improving the cleaning effect.

[0052] Further, it can be understood that when the valve assembly 15 alternates and switches, the pumping speed of water will inevitably be reduced. For example, when the filter element 15 on the left is blocked by cinder and the permeability becomes low, the first valve body on the right opens and the first valve body on the left closes. At this time, the filter element on the left can be cleaned under the action of the water flow. In fact, only when the filter element 15 on the left is blocked is it necessary for the valve assembly on the left to alternate and switch its working state to improve the cleaning effect. After the filter element 15 on the left is cleaned, there is no need for the valve assembly to alternate and switch its working state, so as to ensure the pumping speed of the drainage device. As a preferred implementation manner, both ends of the two third channels far from the second channel are connected to the drain pipe 17. A limiting component 16 is provided between the guiding cylinder 152 and the guiding rod. The limiting component is configured to have a first state in which the rigid guiding rod and the guiding cylinder 152 are limited to the limiting plate 154 abuting against the end of the guiding cylinder 152 and a second state in which the rigid guiding rod and the guiding cylinder 152 are released. The limiting component 16 is configured with a transmission shaft 161. When the transmission shaft rotates, the limiting component 16 is in the second state. The drain pipe 17 is provided with a driving shaft 162 parallel to the transmission shaft 161. Both ends of the transmission shaft and the driving shaft are provided with first bevel gears 1610 for transmission. A piston cylinder 18 is provided on the side wall of the first channel corresponding to the third channel. The piston chamber extends into the first channel and is open at one end and communicates with another first channel at the other end. A piston 180 is provided in the piston cylinder. A rigid rod 181 is coaxially provided on the piston. An intermediate bevel gear 182 is provided at the end of the rigid rod 181 by a rotating shaft. The rigid rod 181 is parallel to the transmission shaft 161 and is located between the transmission shaft and the driving shaft.

[0053] Further, the drive shaft 156 vertically penetrates through the drain pipe 17. A drive impeller 19 is arranged inside the drain pipe 17, and the drive shaft 162 is drivingly connected to the drive impeller 19.

[0054] Specifically, referring to Figure 2 , Figure 4 , by providing the limiting component 16, the guide rod 153 and the guide cylinder can be limited, so that the third valve plate is in the state of opening the valve passage. At this time, when the water flow passes through the third valve plate, the valve plate will not close, thus ensuring the pumping effect. The water flow flows into the drain pipe 17 after passing through the third channel and then enters the water pump, thereby being able to drive the drive impeller 19 to rotate. Referring to Figure 10 , a third bevel gear 1620 is arranged on the drive shaft 162, and a connecting sleeve 192 is sleeved outside the third bevel gear. The drive impeller drives the impeller shaft 190 to rotate. The other end of the impeller shaft 190 extends into the connecting sleeve and is drivingly connected to the third bevel gear through a fourth bevel gear, so that when the drive impeller rotates, the drive shaft 162 is driven to rotate; when the water pump is working to pump water, a suction effect can be generated. At this time, if the left filter element is blocked, under the action of the suction force, the water flow passes through the right first channel into the second channel and the left third channel, and a certain negative pressure will be generated below the right first channel. Since the left filter element is blocked and has poor air and water permeability, and when the water flow flows from the second channel into the left third channel, it will also have a certain impact on the left filter element. Therefore, the pressure in the left first channel is higher than the pressure in the right first channel. At this time, there is a certain pressure difference at both ends of the piston cylinder 18 arranged on the left first channel. Therefore, a pressure difference is generated on both sides of the piston 180, and under the action of the pressure difference, the piston 180 can be pushed to move to the right, so that the intermediate gear contacts both the first gear on the drive shaft and the first gear on the transmission shaft 161. At this time, the drive shaft drives the transmission shaft 161 to rotate through the intermediate gear. When the transmission shaft 161 rotates, the limiting component 16 is in the released second state. At this time, the guide rod can slide freely in the guide cylinder. At this time, the valve body assembly 15 can be switched between the open and closed states to clean the left filter element. When the left filter element is cleaned and has good water permeability, under the suction force generated by the operation of the water pump, the pressure in the left first channel also decreases. However, since the first valve body and the first one-way valve at both ends of the left first channel are both in the closed state, water cannot enter through the left first channel, and the water flow can enter from the right first channel. Therefore, the pressure in the left first channel is not higher than the pressure in the right first channel. At this time, the pressure on the left side of the piston is lower than the pressure on the right side, and the piston moves to the left, disconnecting the transmission shaft 161 and the drive shaft 162, and the transmission shaft stops rotating. The limiting component 16 switches from the second state to the first state to limit the guide rod and ensure the pumping effect.

[0055] Further, specifically, referring to Figures 6 - 8 , the specific structure of the limit component 16 is as follows: it includes a protective outer cylinder 160 arranged around the guide cylinder 152. One end of the protective outer cylinder close to the partition is integrally connected to the guide cylinder 152, and the other end is detachably provided with an end cover. A guide hole for the guide rod 153 to pass through is provided on the end cover. A limit plate 154 is detachably provided at the end of the guide rod extending out of the end cover. A sliding sleeve 165 is sleeved outside the guide cylinder. A second compression spring 166 is arranged on the side of the sliding sleeve away from the end cover. A rotating sleeve 167 sleeved around the guide cylinder is arranged between the sliding sleeve and the end cover. A conical tooth surface 1671 coaxial with the guide cylinder is provided on the rotating sleeve. A third bevel gear meshing with the conical tooth surface 1671 is provided at the end of the transmission shaft 161 extending into the protective outer cylinder. Referring to Figure 8 , a plurality of first protrusions 1671 are evenly spaced on the end face of the end of the rotating sleeve in contact with the sliding sleeve. At least two second protrusions 1653 are provided on the surface of the sliding sleeve in contact with the rotating sleeve. A limit channel 1520 is provided on the side wall of the guide cylinder in the area surrounded by the sliding sleeve. A limit post 164 is arranged in the limit channel in a guiding manner. An annular groove 163 adapted to the limit channel 1520 is provided on the periphery of the guide rod. And when the limit plate 154 abuts against the end cover, the annular groove 163 corresponds to the limit channel. Along the axial direction of the guide cylinder, in the direction from the guide cylinder to the partition side, the inner peripheral surface of the sliding sleeve 165 includes a first circumferential surface 1652, a second circumferential surface 1651 coaxial with the guide cylinder, and a guiding surface connecting the first circumferential surface and the second circumferential surface. The diameter variation of the first circumferential surface is greater than the radius of the second circumferential surface. The working principle of the limit component 16 is: when the transmission shaft 161 does not rotate, under the elastic force of the second compression spring, the rotating cylinder abuts against the end cover, the sliding sleeve abuts against the rotating cylinder, and the second protrusion 1671 is opposite to the two adjacent first protrusions (referring to Figure 8 ), referring to Figure 7 , at this time, the second circumferential surface 1651 surrounds the limit channel 1520, thereby limiting the limit post 164, and the limit post limits the guide rod. When the transmission shaft 161 rotates, it drives the rotating sleeve to rotate. When the rotating sleeve rotates, it will push the sliding sleeve to compress the second compression spring through the action of the first protrusion and the second protrusion, so that the second circumferential surface 1652 corresponds to the limit channel. At this time, when the guide rod moves in the axial direction, it can push the limit post outwards, and the guide rod 153 can slide freely in the axial direction, enabling the valve assembly to switch between the open and closed states and clean the filter element 105. When the cleaning of the filter element is completed, the transmission shaft 161 stops rotating. At this time, when the valve assembly switches to the open state where the limit plate abuts against the end cover, under the elastic force of the second compression spring, the second protrusion is placed between two adjacent first protrusions again, and the second circumferential surface surrounds the periphery of the limit channel again, thereby limiting the guide rod again.

[0056] Further, referring toFigure 1 , Figure 2 , as a preferred embodiment, a filter cover 1a is detachably arranged at the liquid inlet end of the cylindrical outer shell 10. By providing a filtering device, large particles of coal cinder can be filtered, which can avoid the situation that large particles of coal cinder enter the first channel and prevent the first valve plate from closing, and ensure the reliability of the filtering device.

[0057] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principle. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) disclosed in the present application that have similar functions.

Claims

1. A coal mine underground drainage device based on fluid-structure interaction, the device comprising a filtering device (1) and a water pump (2), characterized in that, the filtering device (1) comprises: a cylindrical outer housing (10), two first channels (101) are arranged on opposite sides inside the outer housing (10), a first valve body (102) is arranged at one end of the two first channels (101) in the same direction, the two first valve bodies (102) are configured to alternately open the ends of the first channels (101), and a first one-way valve (103) that allows the flowing medium to flow out of the first channel (101) unidirectionally is arranged at the other end of each of the two first channels (101). Along the extending direction of the first channel, a first liquid passing port (104) is arranged in the middle area of the side walls of the two first channels, and a filtering element (105) is arranged for each first liquid passing port (104); an arc-shaped second channel (11), arranged between the two first channels and both ends thereof are communicated with the two first liquid passing ports (104); two third channels (12), one end of the two third channels (12) is communicated with each other; the first valve body (102) comprises a first rotating shaft (1020) rotatably arranged at the opening position of the first channel, a first valve plate (1021) arranged on the first rotating shaft (1020), and a limiting surface (1022) arranged on the side of the opening of the first channel away from the first rotating shaft. The two first rotating shafts (1020) are arranged in parallel, and a rigid connecting rod (1023) is arranged between the two first rotating shafts. The two ends of the connecting rod are respectively hinged to the two first rotating shafts (1020), and at least one of the two first rotating shafts (1020) and the outer housing is provided with a first torsion spring. Under the elastic force of the first torsion spring, one first valve plate leaves the limiting surface (1022), and the other first valve plate contacts the limiting surface (1022); the arc-shaped second channel (11) is bent in a direction away from the third channel (12); a second valve body (14) is arranged at each end of each third channel (12) connected to the second channel (11) and the first liquid passing port (104); the second valve body (14) arranged for each third channel is configured such that when the first valve body (102) arranged on the corresponding first channel is opened in the third channel (12), the second valve body arranged in the third channel (12) is closed, and when the first valve body (102) arranged on the corresponding first channel is closed in the third channel (12), the second valve body arranged in the third channel (12) is opened; The second valve body (14) includes a second rotating shaft (141) disposed on one side where the third channel is connected to the first channel, and a second valve plate (142) disposed on the second rotating shaft (141). A second torsion spring is disposed between the second rotating shaft and the outer sidewall of the third channel, so that when the second valve plate is in a free state, it abuts against the filter element (105) and is in an open state; On the side of each third channel (12) away from the second channel of the second valve body (14), a valve assembly (15) is further provided, and the valve assembly (15) is configured to alternately switch between an open state and a closed state when there is a liquid flow passing through.

2. A coal mine underground drainage device based on fluid-structure interaction according to claim 1, characterized in that The first valve plate (1021) is located on the side of the limiting surface (1022) close to the other end of the first channel.

3. A coal mine underground drainage device based on fluid-structure interaction according to any one of claims 1-2, characterized in that The valve assembly (15) includes a partition plate (150) disposed perpendicular to the flow direction of the third channel (12), at least one valve passage (151) disposed on the partition plate (150), a guide cylinder (152) disposed on one side of the partition plate and coaxially disposed with the valve passage, a rigid guide rod (153) guidingly disposed in the guide cylinder (152), a limiting plate (154) is provided on the rigid guide rod, a third valve plate (155) adapted to the valve passage (151) is disposed on the side of the partition plate close to the second channel, the end of the rigid guide rod (153) is connected to the third valve plate, and a first elastic member (156) is disposed between the guide rod (153) and the guide cylinder (152). Under the elastic force of the first elastic member (156), the limiting plate (154) abuts against the end of the guide cylinder (152) for limiting, and the third valve plate (155) is in an open state spaced from the valve passage.

4. A coal mine underground drainage device based on fluid-structure interaction according to claim 3, characterized in that Both ends of the two third channels, which are far from the second channel, are connected to a drain pipe (17). A limiting component (16) is arranged between the guiding cylinder (152) and the guiding rod. The limiting component is configured to have a first state in which the rigid guiding rod and the guiding cylinder (152) are limited until the limiting plate (154) abuts against the end of the guiding cylinder (152), and a second state in which the rigid guiding rod and the guiding cylinder (152) are released. The limiting component (16) is configured with a transmission shaft (161). The drain pipe (17) is provided with a driving shaft (162) parallel to the transmission shaft (161). End parts of the transmission shaft and the driving shaft are both provided with first bevel gears (1610) for transmission. A piston cylinder (18) is arranged on the side wall of the first channel corresponding to the third channel. The piston cylinder (18) extends into the first channel and is open at one end, and is connected to the other first channel at the other end. A piston is arranged in the piston cylinder. A rigid rod (181) is coaxially arranged on the piston. An intermediate bevel gear (182) is arranged at the end part of the rigid rod (181) through a rotating shaft. The rigid rod (181) is arranged parallel to the transmission shaft (161) and is located between the transmission shaft and the driving shaft.

5. A coal mine underground drainage device based on fluid-structure interaction according to claim 4, characterized in that the driving shaft (162) vertically penetrates through the drain pipe (17), a driving impeller (19) is arranged in the drain pipe (17), and the driving shaft (162) is drivingly connected to the driving impeller (19).

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