Drilling drainage device for old goaf water

Abstract

The invention discloses a drilling drainage device for old goaf water, and relates to the technical field of coal mine drilling drainage, the drilling drainage device comprises a shell, a rotatable separation tank is arranged in the shell, the separation tank is communicated with a feeding pipe used for receiving a gas-liquid mixture flowing out during drainage operation, and an exhaust pipe used for exhausting gas is arranged at the top of the shell; a liquid discharge pipe for discharging liquid is mounted on the outer circumferential surface of the shell; the separation tank is formed by sleeving an upper movable part and a lower movable part in a sliding manner along the axial direction of the shell, and the upper movable part and the lower movable part are arranged in an inner cavity of the shell in a sliding manner; the volume of the inner cavity of the separation tank is increased along with the increase of the gas pressure in the input gas-liquid mixture. According to the invention, a cyclone separation principle is adopted, gas and liquid are separated under the action of centrifugal force, the drainage efficiency is improved, the drainage speed can be automatically adjusted according to the change of gas pressure, the gas-liquid separation effect is improved, the drainage operation of water in the old goaf of the coal mine can be efficiently and safely completed, and the discharge of solid waste residues is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine drilling and drainage, and particularly relates to a drilling and drainage device for water in old goafs. Background Art

[0002] During the coal mine mining process, the water accumulation problem in old goafs is a major long-existing safety hazard. After the goaf is formed, groundwater may continuously seep in, causing a large amount of water accumulation. Once this accumulated water suddenly leaks, it may trigger mine water inrush accidents, threatening the lives of miners and may also cause roadway collapse, affecting the normal production of coal mines. Currently, the drainage of water in old goafs of coal mines mainly uses drilling and drainage devices to draw out the accumulated water through boreholes. However, the following technical problems still exist in gas-liquid separation in the prior art:

[0003] During the drainage of water in old goafs, gas and liquid are usually discharged in a mixed state. Especially in the initial stage, the gas pressure is relatively high, resulting in too fast gas-liquid flow velocity, shortened cyclone separation time, causing some gas to entrain liquid droplets for discharge, and reducing the separation efficiency. In addition, water mist or tiny liquid droplets may also appear in the gas-liquid mixed flow. These liquid droplets are difficult to separate during the exhaust process, leading to an increase in the humidity of the mine environment and may even affect the operation of equipment;

[0004] Under the impact of high-pressure gas, a large number of tiny bubbles are generated when the gas enters the liquid. These bubbles not only increase the gas-liquid interface area, reduce the aggregation and discharge efficiency of the gas, but also affect the centrifugal force effect of cyclone separation, reducing the equivalent density of the liquid, and thus leading to a decrease in separation efficiency. In addition, tiny bubbles may entrain liquid droplets into the exhaust system, increasing the additional difficulty of gas-liquid separation.

[0005] To solve the above technical problems, the present invention provides a drilling and drainage device for water in old goafs. Summary of the Invention

[0006] To solve the technical problems existing in the above prior art, the present invention provides a drilling and drainage device for water in old goafs.

[0007] To achieve the above object, the present invention provides the following technical solutions: It includes a housing. Inside the housing, there is a rotatable separation tank. The separation tank is connected and installed with a feed pipe for receiving the gas-liquid mixture flowing out during the drainage operation. At the top of the housing, there is an exhaust pipe for discharging gas, and on the outer circumferential surface of the housing, there is a drain pipe for discharging liquid; The separation tank is composed of an upper movable part and a lower movable part which are slidably sleeved along the axial direction of the housing, and both the upper movable part and the lower movable part are slidably arranged in the inner cavity of the housing; As the gas pressure in the input gas-liquid mixture increases, the inner cavity volume of the separation tank increases.

[0008] Preferably, a plurality of discharge ports are evenly arranged on the outer circumferential surface of the movable part. The discharge ports are in a gradually deformed structure with a narrow upper part and a wide lower part. A second opening is arranged on the outer circumferential surface of the outer shell corresponding to the position of the discharge port. The height of the second opening is less than that of the discharge port. The overlapping area of the discharge port and the second opening forms a liquid discharge channel.

[0009] Preferably, a plurality of feed ports are evenly arranged on the outer circumferential surface of the movable part. A first opening is arranged on the outer circumferential surface of the outer shell corresponding to the position of the feed port. The overlapping area of the feed port and the first opening forms a mixture feed channel; the feed port is in a gradually deformed structure with a narrow upper part and a wide lower part, and the height of the first opening is less than that of the feed port.

[0010] Preferably, a partition part is integrally formed by downward depression in the middle of the upper movable part, and an exhaust hole communicating with the exhaust pipe is arranged at the center of the bottom of the partition part.

[0011] Preferably, spikes are installed on the outer surface of the partition part.

[0012] Preferably, when the partition part is immersed in the liquid, the exhaust hole divides the liquid into two internal and external swirling flow fields.

[0013] Preferably, a first rack arranged in the vertical direction is installed on the outer circumferential surface of the upper movable part, a second rack is installed on the outer circumferential surface of the lower movable part corresponding to the position of the first rack, a gear is meshed and connected between the first rack and the second rack, the gear is rotatably installed in the bracket, and an annular guide rail is installed on the inner wall of the outer shell corresponding to the position of the bracket. The bracket and the annular guide rail are slidably assembled.

[0014] Preferably, a spring is installed between the lower end of the lower movable part and the bottom wall of the inner cavity of the outer shell.

[0015] Preferably, a sleeve is integrally formed by upward protrusion on the bottom wall of the lower movable part. A rotating shaft is slidably assembled in the sleeve through a key. A motor is installed at the lower end of the outer shell, and the motor shaft of the motor is fixedly connected to the rotating shaft.

[0016] Compared with the prior art, the present invention provides a drilling and drainage device for water in goafs, and has the following beneficial effects:

[0017] (1) In the present invention, the high-speed rotating separation tank uses the centrifugal force to make the liquid in the gas-liquid mixture be thrown outwards and discharged through the drain pipe, while the gas remains in the central area and is discharged through the exhaust pipe, effectively reducing the phenomenon of gas entraining liquid droplets and improving the gas-liquid separation effect.

[0018] (2) The present invention adopts a separation tank in which the upper movable part and the lower movable part slide axially, and an adjustable liquid discharge channel is designed on the outer shell. When the gas pressure is high, the area of the liquid discharge channel automatically shrinks, increasing the residence time of the gas-liquid mixture in the separation tank, making the separation more sufficient, effectively reducing the problem of gas entraining liquid droplets; when the gas pressure decreases, the liquid discharge channel gradually increases, accelerating the liquid discharge speed and improving the liquid discharge efficiency; realizing dynamic adjustment of the liquid discharge speed, improving the gas-liquid separation quality, and avoiding the problem of uneven liquid spraying under high pressure.

[0019] (3) An air cavity is arranged in the upper movable part, and an exhaust hole communicating with the exhaust pipe is designed at its bottom. When the gas pressure of the gas-liquid mixture increases, the exhaust hole is submerged by the liquid, forming a closed cavity, so that the gas accumulates to a certain pressure in the air cavity before being discharged, avoiding sudden gas release, and improving the uniformity and stability of exhaust; as the drainage operation progresses, the exhaust hole is gradually exposed above the liquid level, enabling the gas to be discharged smoothly, avoiding the problem of the gas impacting the exhaust pipe instantaneously, reducing the volatility of the exhaust system, and improving the stability of emission control.

[0020] (4) Since a large number of tiny bubbles are generated when high-pressure gas enters the liquid, affecting the gas-liquid separation efficiency, the present invention installs spikes on the outer surface of the partition part and makes it move up and down reciprocally in the vertical direction. By mechanical action, the tiny bubbles are punctured, accelerating the aggregation and separation of the bubbles, effectively reducing gas entraining liquid droplets, improving the purity of gas-liquid separation, reducing water mist, and improving the dryness of exhaust.

[0021] (5) The separation tank of the present invention divides the liquid into two outer and inner swirling flow fields at the exhaust hole. The outer swirling flow field has a larger centrifugal force and can quickly throw off large air bubbles and large liquid droplets, while the inner swirling flow field has a smaller centrifugal force, ensuring that tiny bubbles can be fully released. This design effectively reduces the secondary entrainment effect, avoids the problem of liquid droplets being wrapped by bubbles due to high pressure, and improves the final gas-liquid separation effect.

[0022] (6) During the rotation process, the solid waste residues show a distribution law of small inside and large outside according to the particle size. The present invention realizes the step-by-step discharge of solid waste residues according to the particle size through the liquid discharge channel with variable position of the lower movable part. When the gas pressure is high, the opening of the liquid discharge channel is small, and only the small particle solid waste residues on the outer layer are discharged; when the gas pressure decreases, the lower movable part moves upward, and only then will the larger particle solid waste residues be released, preventing blockage and improving the slag discharge efficiency.

[0023] (7) The upper movable part and the lower movable part are meshed and connected by a gear and a rack, ensuring the synchronous movement of the two, avoiding the movement disorder caused by the change of the weight of the gas-liquid mixture, enabling it to maintain the best gas-liquid separation state under different working conditions, and improving the safety and reliability of the equipment operation. Description of the Drawings

[0024] The accompanying drawings are used to provide a further understanding of the present invention and form a part of the description. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention. In the accompanying drawings:

[0025] Figure 1 It is a schematic structural diagram of the entire drilling and drainage device for goaf water in the embodiment;

[0026] Figure 2 It is a schematic structural diagram of the entire drilling and drainage device for goaf water in the embodiment in a state of high input air pressure;

[0027] Figure 3 It is a schematic structural diagram of the entire drilling and drainage device for goaf water in the embodiment in a state of medium input air pressure;

[0028] Figure 4 It is a schematic structural diagram of the entire drilling and drainage device for goaf water in the embodiment in a state of low input air pressure;

[0029] Figure 5 It is for Figure 3 a partially enlarged structural schematic diagram;

[0030] Figure 6 It is a partially sectional structural schematic diagram of the outer shell in the embodiment;

[0031] Figure 7 It is an assembly schematic diagram of the upper movable part and the lower movable part in the embodiment;

[0032] Figure 8 It is a schematic structural diagram of the upper movable part in the embodiment Figure 1 ;

[0033] Figure 9 It is a schematic structural diagram of the upper movable part in the embodiment Figure 2 ;

[0034] Figure 10 It is a schematic structural diagram of the lower movable part in the embodiment;

[0035] Figure 11 It is a schematic structural diagram of the outer shell in the embodiment;

[0036] Figure 12 It is a schematic diagram of the stacking state of solid waste residues in the embodiment;

[0037] Figure 13 It is a schematic diagram of the air cavity in a relatively closed state in the embodiment;

[0038] Figure 14 It is a schematic diagram of the air cavity and the exhaust hole in a communicating state in the embodiment.

[0039] In the figure: 1. Drilling hole; 2. Drilling tool; 3. Feed pipe;

[0040] 4. Separation tank; 41. Upper movable part; 411. First rack; 412. Second rack; 413. Gear; 414. Annular guide rail; 42. Lower movable part; 43. Feed inlet; 44. Exhaust hole; 45. Discharge outlet; 46. Partition part;

[0041] 5. Outer shell; 51. First opening; 52. Second opening;

[0042] 6. Exhaust pipe; 7. Drain pipe; 8. Spring; 9. Motor; 10. Solid waste residue; 11. Liquid level; 12. Gas chamber. Specific implementation manner

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0044] This embodiment proposes a drilling and drainage device for water in old goafs. As Figures 1 to 14 shown, during the drainage operation, first, a drilling hole 1 is drilled on the wall of the old goaf through the drilling tool 2, and the mixture of gas and liquid will be discharged through the drilling hole 1. Especially in the drainage of old goaf water hazards in coal mines, preventing the discharge of gas and toxic and harmful gases is a key issue. When designing the drainage device, the separation and treatment of gas must be considered. For this reason, the present invention uses the cyclone separation principle to realize the separation of gas and liquid. Specifically: it includes an outer shell 5, and a rotatable separation tank 4 is arranged inside the outer shell 5. A feed pipe 3 is connected and installed between the drilling hole 1 and the separation tank 4. The water and gas inside the old goaf enter the separation tank 4 through the drilling hole 1 and the feed pipe 3. An exhaust pipe 6 for discharging gas is installed at the top of the outer shell 5, and a drain pipe 7 for discharging liquid is installed on the outer circumferential surface of the outer shell 5; during the drainage process, the gas-liquid mixture enters the inside of the separation tank 4 through the feed pipe 3. The high-speed rotating separation tank 4 generates centrifugal force, and the centrifugal force throws the liquid in the gas-liquid mixture to the periphery and discharges it through the drain pipe 7, while the gas remains in the central area and is discharged through the exhaust pipe 6. It should be noted that the gas generated during the drainage process can be discharged through gas methods such as pressure difference, and the gas-liquid mixture enters the separation tank 4 through the feed pipe 3 for gas-liquid separation operation.

[0045] In the initial stage of the drainage operation, due to the relatively high gas pressure, the gas-liquid separation process faces the following drawbacks: On the one hand, cyclone separation relies on centrifugal force to separate gas from liquid. However, under high-pressure conditions, the gas-liquid flow rate is too fast, shortening the action time of cyclone separation. Some gas may still be entrained in the liquid. Moreover, during the release of high-pressure gas, it is easy to carry liquid droplets, forming secondary entrainment, resulting in the problem that water mist and liquid droplets are not completely removed after gas-liquid separation. This situation will cause liquid water to be ejected from the exhaust pipe 6. Therefore, in this embodiment, the separation time of the gas-liquid mixture in the separation tank 4 is increased to improve the gas-liquid separation quality. Specifically, the separation tank 4 is composed of an upper movable part 41 and a lower movable part 42 that are slidably sleeved along the axial direction of the outer shell 5, and both the upper movable part 41 and the lower movable part 42 are slidably arranged in the inner cavity of the outer shell 5. A plurality of discharge ports 45 are evenly formed on the outer circumferential surface of the lower movable part 42. The discharge ports 45 are in a gradually deformed structure with a narrower upper part and a wider lower part. A second opening 52 is formed on the outer circumferential surface of the outer shell 5 corresponding to the position of the discharge ports 45. The height of the second opening 52 is less than the height of the discharge ports 45. The overlapping area of the discharge ports 45 and the second opening 52 forms a liquid discharge channel. In the initial state, the wider middle and lower parts of the discharge ports 45 overlap with the second opening 52. At this time, the area of the liquid discharge channel is the largest. During the drainage operation, if the gas pressure is high, the discharge ports 45 move downward along the vertical direction. At this time, the area of the liquid discharge channel decreases. And during the downward movement of the lower movable part 42, the area between adjacent two discharge ports 45 increases, so the area blocking the second opening 52 increases, further reducing the liquid discharge, achieving the purpose of increasing the residence time of the gas-liquid mixture in the separation tank 4, and thus improving the gas-liquid separation quality. It should be noted that in the initial state, the second opening 52 always overlaps with the wider middle and lower parts of several discharge ports 45 to ensure that the liquid discharge channel is in a smooth state until the lower movable part 42 moves downward to the limit distance. At this time, the second opening 52 just overlaps with a plurality of discharge ports 45 intermittently, and the liquid discharge efficiency of the liquid discharge channel is the lowest.

[0046] On the other hand, the rapid drainage of high-pressure gas will cause violent turbulence of the fluid, affecting the stable distribution of the liquid in the cyclone separation device. Due to the increase in turbulence intensity, liquid droplets are more likely to be entrained into the gas flow, resulting in a large amount of liquid being entrained in the gas phase and reducing the separation effect. In this embodiment, in order to reduce the influence of turbulence, the gas pressure is first reduced by increasing a buffer chamber. Specifically, a plurality of feed ports 43 are evenly formed on the outer circumferential surface of the upper movable part 41. A first opening 51 is formed on the outer circumferential surface of the outer shell 5 corresponding to the position of the feed ports 43. The overlapping area of the feed ports 43 and the first opening 51 forms a mixture feed channel. During the drainage operation, if the gas pressure is high, the upper movable part 41 moves upward along the axial direction of the outer shell 5. At this time, the inner cavity volume of the separation tank 4 increases, effectively reducing the gas pressure in the gas-liquid mixture.

[0047] On the basis of the above solution, in this embodiment, gas pressure is used as the power source to drive the linear motion of the upper movable part 41 and the lower movable part 42. Specifically, the feed inlet 43 has a tapered structure with a narrower upper part and a wider lower part, and the height of the first opening 51 is less than the height of the feed inlet 43; in the initial state, the first opening 51 and the narrower upper part of the feed inlet 43 overlap, and at this time, the area of the mixture feed channel is the smallest; when the gas pressure increases, the upper movable part 41 moves upward along the axis of the housing 5, and the area of the mixture feed channel increases, so the volume of the gas-liquid mixture input into the inner cavity of the separation tank 4 increases. At the same time, the area of the liquid discharge channel decreases, and further, the volume of the gas-liquid mixture in the inner cavity of the separation tank 4 continues to increase, the upward force exerted by the gas on the upper movable part 41 increases, and the downward force exerted on the lower movable part 42 increases, achieving the purpose that when the gas pressure increases, the upward movement of the upper movable part 41 causes the area of the mixture feed channel to increase, and the downward movement of the feed inlet 43 causes the area of the liquid discharge channel to decrease.

[0048] As the volume of the gas-liquid mixture in the inner cavity of the separation tank 4 increases, the weight of the gas-liquid mixture also increases, so the pressure exerted by the gas-liquid mixture on the lower movable part 42 also increases, which in turn causes the downward movement distance of the lower movable part 42 and the upward movement distance of the upper movable part 41 to be asynchronous, affecting the volume change of the gas-liquid mixture in the separation tank 4. Therefore, in this embodiment, a driving mechanism for driving the two to move relative to each other is provided between the upper movable part 41 and the lower movable part 42. Specifically, a first rack 411 arranged in the vertical direction is installed on the outer circumferential surface of the upper movable part 41, and a second rack 412 is installed on the outer circumferential surface of the lower movable part 42 corresponding to the position of the first rack 411. A gear 413 is meshed and connected between the first rack 411 and the second rack 412. The gear 413 is rotatably installed in the bracket, and an annular guide rail 414 is installed on the inner wall of the housing 5 corresponding to the position of the bracket. The bracket and the annular guide rail 414 are slidably assembled; when the pressure exerted by the gas-liquid mixture on the lower movable part 42 increases, the lower movable part 42 drives the second rack 412 to move downward, and the second rack 412 drives the first rack 411 to move upward synchronously through the gear 413, and the first rack 411 drives the upper movable part 41 to move upward synchronously. In this embodiment, in order to prevent structures such as gears and racks from interfering with the inner wall of the housing 5 during the rotation of the separation tank 4, a cavity is formed by the outward protrusion of the corresponding position of the housing 5 for the driving mechanism, and structures such as gears and racks are placed in the cavity.

[0049] Due to the opposite forces exerted on the upper movable part 41 and the lower movable part 42 by the continuously increasing gas volume, if the gas in the gas-liquid mixture directly discharges through the exhaust pipe 6, the upward force exerted by the gas on the upper movable part 41 will decrease, and a long-time input of high-pressure gas is required to increase the internal cavity space of the separation tank 4, resulting in a decline in the overall gas-liquid separation efficiency. Therefore, in this embodiment, a partition part 46 is integrally formed with a downward depression in the middle of the upper movable part 41, and an exhaust hole 44 communicating with the exhaust pipe 6 is provided at the center of the bottom of the partition part 46; in the initial state, the lower end surface of the exhaust hole 44 extends into the interior of the lower movable part 42. As the area of the mixture feeding channel gradually increases and the area of the liquid discharge channel gradually decreases, the liquid level 11 in the separation tank 4 rises until it submerges the exhaust hole 44. At this time, a relatively closed gas cavity 12 is formed between the upper movable part 41 and the lower movable part 42, and the gas accumulates in the gas cavity 12. As the gas volume increases, the upward force exerted by the gas on the upper movable part 41 increases until the exhaust hole 44 exceeds the liquid level 11. At this time, the gas cavity 12 communicates with the exhaust hole 44, and the gas discharges into the exhaust pipe 6 through the exhaust hole 44, and the upward force on the upper movable part 41 decreases. If the gas input volume decreases, the exhaust hole 44 is submerged again, and the gas cavity 12 re-forms a relatively closed chamber, and the gas is discharged only after accumulating to a certain pressure in the gas cavity 12, avoiding sudden gas release and improving the uniformity and stability of exhaust.

[0050] If the gas pressure in the gas-liquid mixture decreases, it indicates that most of the gas drainage operation is completed. Then, for the liquid drainage operation, the lower movable part 42 needs to move upward to reset, increasing the area of the liquid discharge channel and accelerating the liquid discharge efficiency. Therefore, a spring 8 is installed between the lower end of the lower movable part 42 and the inner cavity bottom wall of the outer shell 5, and an upward thrust is exerted on the lower movable part 42 by the spring 8 to reset it, increasing the area of the liquid discharge channel. At the same time, the upper movable part 41 moves downward synchronously, reducing the area of the mixture feeding channel, that is, the liquid volume in the separation tank 4 gradually decreases, and the pressure exerted by the liquid on the lower movable part 42 also decreases. As the liquid level 11 drops, the liquid level 11 moves away from the exhaust hole 44, the gas cavity 12 communicates with the exhaust hole 44, and the gas discharges through the exhaust hole 44. In this embodiment, the upper end of the spring 8 is rotatably installed on the lower movable part 42 through a bearing, that is, when the lower movable part 42 rotates, the spring 8 can remain stationary.

[0051] Since the separation tank 4 needs to perform rotational motion and linear motion, therefore, in this embodiment, a sleeve is integrally formed with an upward protrusion on the bottom wall of the lower movable part 42. A rotating shaft is slidably assembled in the sleeve through a key. A motor 9 is installed at the lower end of the outer shell 5, and the motor shaft of the motor 9 is fixedly connected to the rotating shaft. The separation tank 4 is driven to perform rotational motion by the motor 9, and the separation tank 4 is also capable of performing linear motion through the sleeve and the rotating shaft.

[0052] During the high-pressure gas release stage, when gas enters the liquid, a large number of tiny bubbles are formed due to high-speed impact and shearing effects. These bubbles are distributed inside the liquid, increasing the gas-liquid interface area and making it more difficult for the gas to aggregate and discharge alone, thereby reducing the separation efficiency. In addition, cyclone separation relies on density differences for separation. When there are a large number of bubbles in the liquid phase, the equivalent density decreases, resulting in a weakened centrifugal force effect in cyclone separation and affecting the separation efficiency. Therefore, in this embodiment, spikes are installed on the outer surface of the partition portion 46. As the volume of gas in the gas chamber 12 changes, the partition portion 46 moves up and down reciprocally in the vertical direction. During this process, the bubbles are pricked by the spikes.

[0053] Further, when the partition portion 46 is immersed in the liquid, the exhaust hole 44 divides the liquid into two inner and outer swirling flow fields. The magnitude of the centrifugal force acting on an object is related to the distance of the object's location from the rotation center, that is, the centrifugal forces generated by the two inner and outer swirling flow fields are different. The centrifugal force of the outer swirling flow field is large, quickly throwing off the large bubbles and large droplets in the gas-liquid mixture. The centrifugal force of the inner swirling flow field is small, ensuring that the trace dissolved gas or extremely tiny bubbles in the liquid can also be fully released, avoiding the entrapment of liquid droplets in the bubbles caused by high pressure and reducing the secondary entrainment effect.

[0054] There is also solid waste residue 10 in the gas-liquid mixture. During rotation, the larger the particle size of the solid waste residue 10, the greater the centrifugal force it receives, that is, the solid waste residue 10 deposited shows a spatial distribution law with gradually increasing particle size from the inside to the outside. When performing the discharging operation, if the pressure of the initial gas is high, the lower movable portion 42 moves downward. At this time, the small-particle-size solid waste residue 10 in the outer layer can be discharged through the liquid discharge channel, while the large-particle-size solid waste residue 10 in the inner layer accumulates in the lower movable portion 42. As the gas pressure decreases, the lower movable portion 42 moves upward. At this time, the large-particle-size solid waste residue 10 can be gradually discharged through the liquid discharge channel, realizing the step-by-step discharge of the solid waste residue 10 according to the particle size. This not only improves the separation effect and the slag discharge efficiency but also avoids the blockage of the liquid discharge channel by large particles.

[0055] In the description of the present invention, the terms "first", "second", "another", and "yet another" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0056] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0057] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A drilling drainage device for old empty area water, comprising a housing (5), characterized in that: A rotatable separation tank (4) is arranged inside the outer shell (5); the separation tank (4) is connected to a feed pipe (3) for receiving the gas-liquid mixture flowing out during the drainage operation; an exhaust pipe (6) for discharging gas is installed on the top of the outer shell (5); and a liquid discharge pipe (7) for discharging liquid is installed on the outer circumferential surface of the outer shell (5); the separation tank (4) is composed of an upper movable part (41) and a lower movable part (42) which are slidably sleeved along the axial direction of the outer shell (5), and the upper movable part (41) and the lower movable part (42) are both slidably arranged in the inner cavity of the outer shell (5); as the gas pressure in the input gas-liquid mixture increases, the inner cavity volume of the separation tank (4) increases.

2. A drilling drainage device for old empty area water according to claim 1, characterized in that: The outer circumferential surface of the movable portion (42) is evenly provided with a plurality of discharge ports (45), the discharge ports (45) being of a gradually deformed structure that is narrow at the top and wide at the bottom, and the outer circumferential surface of the housing (5) is provided with a second opening (52) at a position corresponding to the discharge port (45), the height of the second opening (52) being smaller than the height of the discharge port (45), and the overlapping area of ​​the discharge port (45) and the second opening (52) forming a liquid discharge channel.

3. The drilling and drainage device for old empty area water according to claim 1 is characterized in that: The outer circumferential surface of the movable portion (41) is evenly provided with a plurality of feed ports (43); the outer circumferential surface of the outer shell (5) is provided with a first opening (51) at a position corresponding to the feed port (43); the overlapping area of ​​the feed port (43) and the first opening (51) forms a mixture feed channel; the feed port (43) is a gradually deformed structure that is narrow at the top and wide at the bottom; the height of the first opening (51) is smaller than the height of the feed port (43).

4. A drilling drainage device for old empty area water according to any one of claims 1 to 3, characterized in that: The middle part of the upper movable part (41) is concave downwards and integrally formed with a partition (46), and an exhaust hole (44) communicating with the exhaust pipe (6) is opened at the center of the bottom of the partition (46).

5. The drilling and drainage device for old empty area water according to claim 4 is characterized in that: The outer surface of the partition (46) is provided with spikes.

6. The drilling and drainage device for old empty area water according to claim 4 is characterized by: When the partition (46) is immersed in the liquid, the exhaust hole (44) separates the liquid into two cyclonic flow fields, inner and outer.

7. A drilling drainage device for old empty area water according to any one of claims 1 to 3, characterized in that: The outer circumferential surface of the upper movable part (41) is provided with a first rack (411) arranged in a vertical direction, and the outer circumferential surface of the lower movable part (42) is provided with a second rack (412) at a position corresponding to the first rack (411). A gear (413) is meshedly connected between the first rack (411) and the second rack (412), and the gear (413) is rotatably installed in the bracket. An annular guide rail (414) is installed on the inner wall of the outer shell (5) at a position corresponding to the bracket, and the bracket and the annular guide rail (414) are slidably assembled.

8. The drilling and drainage device for old empty area water according to claim 7, characterized in that: A spring (8) is installed between the lower end of the lower movable part (42) and the bottom wall of the inner cavity of the shell (5).

9. A drilling drainage device for old empty area water according to claim 8, characterized in that: The bottom wall of the lower movable part (42) protrudes upward and is integrally formed with a sleeve, in which a rotating shaft is slidably mounted via a key. A motor (9) is mounted at the lower end of the housing (5), and the motor shaft of the motor (9) is fixedly connected to the rotating shaft.

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