Gas extraction hole pressure relief device

Abstract

The invention relates to the technical field of coal mining, and discloses a gas extraction hole pressure relief device which comprises a drill rod and an orifice sealer, the drill rod is sleeved with the orifice sealer, a gas conveying pipe is fixedly connected to the top of the orifice sealer, a buffer assembly is arranged on the side of the orifice sealer, and a buffer box is arranged in the buffer assembly; one side wall of the buffer box is fixedly communicated with the air conveying pipe, the other side wall of the buffer box is fixedly connected with a folding bag, the buffer box is communicated with the interior of the folding bag, the side, facing the folding bag, of the buffer box is fixedly connected with two supporting shells, supporting rods are inserted into the supporting shells, and the inner walls of the outer ends of the supporting rods abut against the folding bag. A tension sensor is fixedly installed on the inner side wall of the supporting shell, and a supporting spring is fixedly connected between the tension sensor and the supporting rod. By means of graded regulation and control, a one-step extraction mode is avoided, in addition, the design that the folding bag is communicated with the buffering box is adopted, pressure buffering is achieved, a gas collecting channel is not affected, and it is ensured that the extraction process is stable and free of interruption.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, specifically to a gas extraction hole pressure relief device. Background Technology

[0002] In coal mining, methane is a common and dangerous gas. To reduce methane concentration and ensure mine safety, methane drainage operations are usually carried out. Methane drainage boreholes are a key part of the methane drainage system. However, during the drainage process, the flow state of methane in the borehole is complex and unstable. As the amount of methane emitted may fluctuate with time and geological conditions, the pressure and flow velocity in the borehole will change continuously. This unstable flow state may affect the drainage effect and may even cause safety hazards.

[0003] Traditional gas extraction monitoring methods have many shortcomings. The accuracy and real-time nature of the monitoring data are insufficient, making it difficult to capture rapid pressure changes and flow fluctuations. When abnormal situations such as sudden pressure increases occur, timely and effective early warning and handling cannot be carried out, thereby increasing the risk of accidents. There is a lack of effective flow buffering and pressure relief mechanisms. In the current gas extraction process, multiple sensors are often used to monitor the pressure and flow rate in the borehole to facilitate prevention.

[0004] During gas extraction, without proper flow buffering measures, pressure fluctuations may damage the extraction equipment and shorten its service life. When the pressure is too high, without timely pressure relief measures, it may lead to serious consequences such as borehole rupture and gas leakage. Summary of the Invention

[0005] This invention provides a pressure relief device for a gas extraction borehole to address the problems mentioned in the background art, such as pressure fluctuations that may damage the extraction equipment during the gas extraction process, and excessively high pressure that may lead to borehole rupture and gas leakage.

[0006] This invention provides a gas extraction hole pressure relief device, including a drill rod and a hole sealer. The hole sealer is sleeved on the drill rod, and through holes are opened on both sides of the hole sealer. A gas supply pipe is fixedly connected to the top of the hole sealer. A buffer assembly is provided on the side of the orifice sealer. The buffer assembly includes a buffer box. One side wall of the buffer box is fixedly connected to the gas supply pipe, and a folded bag is fixedly connected to the other side wall of the buffer box. The buffer box and the folded bag are connected internally. Two support shells are fixedly connected to the side of the buffer box facing the folded pouch. Support rods are inserted into the support shells. The support rods are designed with an L-shaped structure. The inner wall of the outer end of the support rod abuts against the outer wall of the folded pouch. A tension sensor is fixedly installed on the inner side wall of the support shell. A support spring is fixedly connected between the tension sensor and the support rod.

[0007] Preferably, a sampling pipe is fixedly connected to the top of the buffer box, an electrically controlled valve is fixedly installed on the sampling pipe, and a ventilation slot is opened on the side where the buffer box connects to the folded bag.

[0008] Preferably, a rectangular groove is provided on the outer wall of the support shell, and a display screen is fixedly installed on the tension sensor, and the display screen can be directly observed through the rectangular groove.

[0009] Preferably, a feed pipe is fixedly connected to the bottom of the gas supply pipe, and a brush is fixedly connected to the inner wall of the orifice sealer.

[0010] Preferably, the orifice sealer has a sealing plug on the side facing the drill hole, the sealing plug has a through groove in the middle, and the inner diameter of the through groove is larger than the diameter of the drill rod. The sealing plug has a sealing component on its side wall for sealing the drill hole.

[0011] Preferably, the sealing assembly includes a soft-shell sealing ring fixedly connected to the sealing plug. The side wall of the soft-shell sealing ring facing the orifice sealer is made of a breathable material, and the side wall of the soft-shell sealing ring facing the sealing plug is made of an impermeable material. The soft-shell sealing ring is filled with porous foam, and the outer wall of the soft-shell sealing ring is covered with a dustproof cover.

[0012] Preferably, the breathable side of the soft-shell sealing ring can be made of PTEE film material, and the non-breathable side of the soft-shell sealing ring can be made of rubber material.

[0013] Preferably, the porous foam can be made of silicone foam material.

[0014] Preferably, the dust cover can be made of flame-retardant non-woven fabric.

[0015] Preferably, a limiting groove can be formed on the outer wall of the soft shell sealing ring, and the limiting groove is engaged with the through hole of the orifice seal.

[0016] Compared with the prior art, the beneficial effects of the present invention are: This invention employs a combination of a buffer box, a folding bag, a support shell, a support rod, a tension sensor, and a support spring. Through the combination of the folding bag, support spring, and tension sensor, it responds in real-time to changes in gas pressure and automatically adjusts the extraction rate based on the extension and retraction of the support rod. This eliminates the need for frequent manual intervention, achieving tiered control for normal extraction under low pressure, accelerated pressure relief under medium pressure, and shutdown for safety under high pressure. This avoids pressure runaway and overcomes the shortcomings of existing technologies where excessively high gas pressure can lead to serious consequences such as borehole rupture and gas leakage. This invention implements a tiered control mechanism, avoiding a one-size-fits-all extraction mode. Furthermore, the interconnected design of the folding bag and buffer box achieves pressure buffering without affecting the gas collection channel, ensuring a stable and uninterrupted extraction process.

[0017] This invention employs a combination of a soft-shell sealing ring, porous foam, and a dust cover. The soft-shell sealing ring features a design that allows gas to flow into the orifice seal while preventing leakage. The elastic support of the porous silicone foam ensures the soft-shell sealing ring fits tightly against the borehole wall, adapting to different borehole diameters or uneven inner walls, thus solving the problem of poor adaptability of single sealing methods. Furthermore, the porous foam, combined with the soft-shell sealing ring, allows for the storage of ample gas through its pores. The rapid expansion of the silicone foam enlarges the soft-shell sealing ring, sealing the gap between the orifice seal and the borehole, preventing continuous gas entry. This overcomes the shortcomings of existing technologies, ensuring a more stable gas flow into the buffer assembly, facilitating precise operation of the subsequent pressure control system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the buffer component of the present invention; Figure 3 This is a schematic diagram of the overall structure of the unfolded folding pouch of the present invention; Figure 4 This is a schematic diagram of the overall internal structure of the orifice sealer of the present invention; Figure 5 This is a schematic diagram of the overall internal structure of the buffer box of the present invention; Figure 6 This is a schematic diagram of the overall internal structure of the support shell of the present invention; Figure 7 This is a schematic diagram of the overall structure of the support shell sealing assembly of the present invention; Figure 8 This is a schematic diagram of the overall structure of the soft-shell sealing ring of the present invention.

[0019] In the diagram: 100, drill pipe; 200. Orifice sealer; 201. Gas supply pipe; 202. Material discharge pipe; 300. Buffer assembly; 310. Buffer box; 311. Extraction tube; 312. Ventilation slot; 320. Folded bag; 330. Support shell; 331. Rectangular slot; 340. Support rod; 350. Tension sensor; 351. Display screen; 360. Support spring; 400. Sealing plug; 500. Sealing assembly; 510. Soft shell sealing ring; 520. Porous foam; 530. Dust cover cloth. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention discloses a gas extraction hole pressure relief device, such as... Figure 1-8 As shown, it includes: a drill rod 100 and a borehole sealer 200. The borehole sealer 200 is sleeved on the drill rod 100. Both sides of the borehole sealer 200 have through holes. An air supply pipe 201 is fixedly connected to the top of the borehole sealer 200. It should be noted that a buffer assembly 300 is provided on the side of the orifice sealer 200. Furthermore, the orifice sealer 200 seals the orifice to prevent gas leakage, and the buffer assembly 300 counteracts pressure shocks to prevent equipment damage due to high pressure. The buffer assembly 300 includes a buffer box 310. One side wall of the buffer box 310 is fixedly connected to the gas pipeline 201, and a folded bag 320 is fixedly connected to the other side wall of the buffer box 310. The buffer box 310 and the folded bag 320 are internally connected. Furthermore, the buffer box 310 can be placed on the ground or installed on the inner wall of the tunnel on the side of the drill pipe, depending on the actual operation.

[0022] It should be noted that the buffer box 310 is fixedly connected to two support shells 330 on the side facing the folded pouch 320. A support rod 340 is inserted into the support shell 330. The support rod 340 is designed with an L-shaped structure. The inner wall of the outer end of the support rod 340 abuts against the outer wall of the folded pouch 320. A tension sensor 350 is fixedly installed on the inner side wall of the support shell 330. A support spring 360 is fixedly connected between the tension sensor 350 and the support rod 340.

[0023] In addition, a sampling pipe 311 is fixedly connected to the top of the buffer box 310, and an electric control valve is fixedly installed on the sampling pipe 311. A ventilation slot 312 is opened on the side of the buffer box 310 connected to the folded bag 320.

[0024] Specifically, a rectangular groove 331 is provided on the outer wall of the support shell 330, and a display screen 351 is fixedly installed on the tension sensor 350. The display screen 351 can be directly observed through the rectangular groove 331. Furthermore, the display screen 351 directly displays pressure-related data through the rectangular groove 331, allowing staff to quickly grasp the operating status of the equipment.

[0025] The working principle of the above technical solution is as follows: During use, the orifice sealer 200 is first fitted onto the drill rod 100 to seal the orifice opening and prevent gas leakage. The gas in the orifice sealer 200 enters the interior through the through hole and is then introduced into the buffer tank 310 of the buffer assembly 300 through the gas delivery pipe 201 at the top. When the gas flow rate is equal to the extraction flow rate, the gas enters the buffer tank 310 and is directly extracted by the extraction pipe 311 for collection. When the gas flow rate is greater than the extraction flow rate, some of the gas enters the buffer tank 310 and flows into the folded bag 320 through the ventilation groove 312, causing the folded bag 320 to expand. When the gas expands, it pushes the L-shaped support rods 340 on both sides. The support rods 340 move outward along the support shell 330 and stretch the support spring 360. The elastic force of the support spring 360 acts in the opposite direction on the support rods 340, forming a buffer for the folded bag 320, offsetting the gas pressure impact, and realizing pressure relief. When the support rods 340 stretch the support spring 360, the tension sensor 350 in the support shell 330 will detect the change in tension of the support spring 360 in real time. The change in tension corresponds to the gas pressure. The tension sensor 350 converts the signal into pressure data, which is displayed intuitively on the display screen 351 at the rectangular slot 331, so that the staff can keep track of the gas pressure in the hole in real time.

[0026] Furthermore, during use, this device, based on the extension and retraction state of the support rod 340 (corresponding to the gas pressure level), realizes the linkage control of the speed adjustment of the extraction pipe 311 and the start and stop of the drill rod 100, ensuring safe and efficient gas extraction. The tension sensor 350 detects the tension of the support spring 360 in real time and uses the tension data to correspond to the extension and retraction position of the support rod 340. The display screen 351 displays the relevant data simultaneously, allowing the staff to intuitively grasp the current status. At the same time, the tension sensor 350 transmits the signal to the control system to trigger the corresponding action. When the support rod 340 is fully retracted: At this time, the gas pressure is within a safe range, the control system maintains the current opening of the electric control valve, the extraction pipe 311 extracts gas at a normal rate, and the drill rod 100 maintains normal working status. When the support rod 340 extends halfway out of the support shell 330: the gas pressure increases, the folded bag 320 expands and pushes the support rod 340 to the semi-extension position, the tension sensor 350 detects the corresponding tension signal, the control system increases the opening of the electric control valve, increases the extraction rate of the extraction pipe 311, and quickly reduces the gas pressure. When the support rod 340 extends fully to the support shell 330: the gas pressure reaches the warning value, the folded bag 320 fully expands to make the support rod 340 fully extend, and after receiving the signal, the control system immediately issues a stop command to stop the drill rod 100 from working, and at the same time adjusts the electric control valve to the maximum opening, so that the extraction pipe 311 extracts at the highest efficiency and quickly relieves pressure to avoid danger. By using the tension sensor 350, dynamic response of gas pressure is achieved, avoiding insufficient extraction efficiency due to excessively low pressure, or safety risks such as leakage and explosion caused by excessively high pressure, thus balancing extraction efficiency and operational safety.

[0027] Furthermore, during use, the tension sensor 350 can completely replace the multiple sets of sensors required in existing devices, achieving real-time monitoring. Even if the tension sensor 350 is damaged, replacement is very convenient. In addition, when the folded bag 320 is fully unfolded, its shape changes significantly, which can be seen directly by the staff. Drilling work can be temporarily paused manually to avoid safety issues caused by excessive gas pressure.

[0028] This invention employs a combination of a buffer box 310, a folding bag 320, a support shell 330, a support rod 340, a tension sensor 350, and a support spring 360. Through the combination of the folding bag 320, the support spring 360, and the tension sensor 350, it responds in real time to changes in gas pressure and automatically adjusts the extraction rate based on the extension and retraction status of the support rod 340. This eliminates the need for frequent manual intervention, achieving graded control for normal extraction under low pressure, accelerated pressure relief under medium pressure, and shutdown for safety under high pressure. This avoids pressure runaway and overcomes the shortcomings of existing technologies where excessively high gas pressure can lead to serious consequences such as borehole rupture and gas leakage. This invention implements a graded control mechanism, avoiding a one-size-fits-all extraction mode. Furthermore, the interconnected design of the folding bag 320 and the buffer box 310 achieves pressure buffering without affecting the gas collection channel, ensuring a stable and uninterrupted extraction process.

[0029] In one specific embodiment: a feed pipe 202 is fixedly connected to the bottom of the gas supply pipe 201, and a brush is fixedly connected to the inner wall of the orifice sealer 200.

[0030] Furthermore, when the brush on the inner wall of the orifice sealer 200 rotates or moves with the drill rod 100, it can clean the coal slag, dust and other impurities attached to the surface of the drill rod 100 in real time, so as to prevent impurities from entering the sealing gap and causing sealing failure, and at the same time reduce the risk of impurities clogging the pipeline during subsequent extraction.

[0031] Furthermore, the feed pipe 202 at the bottom of the gas supply pipe 201 can promptly discharge the impurities swept by the brush, preventing impurities from accumulating inside the orifice seal 200. In addition, when the feed pipe 202 is opened, it can help balance the air pressure inside the orifice seal 200, avoid local pressure abnormalities caused by impurities blocking the gas supply pipe 201, and ensure that gas enters the buffer assembly 300 stably through the gas supply pipe 201.

[0032] It should be noted that the orifice sealer 200 has a sealing plug 400 on the side facing the drill hole. The sealing plug 400 has a through groove in the middle, and the inner diameter of the through groove of the sealing plug 400 is larger than the diameter of the drill rod 100. The sealing plug 400 has a sealing component 500 on its side wall for sealing the drill hole.

[0033] Furthermore, the sealing plug 400 is set on the side of the orifice sealer 200 facing the borehole, with a through groove in the middle for the drill rod 100 to pass through (the inner diameter of the through groove is slightly larger than that of the drill rod 100, leaving room for movement), forming a preliminary seal on the borehole opening as a whole, and forming a double barrier in conjunction with the orifice sealer 200.

[0034] It should be noted that the sealing assembly 500 includes a soft-shell sealing ring 510 fixedly connected to the sealing plug 400. The side wall of the soft-shell sealing ring 510 facing the orifice sealer 200 is made of a breathable material, and the side wall of the soft-shell sealing ring 510 facing the sealing plug 400 is made of an impermeable material. The soft-shell sealing ring 510 is filled with porous foam 520, and the outer wall of the soft-shell sealing ring 510 is covered with a dustproof cover cloth 530.

[0035] In addition, the breathable side of the soft shell sealing ring 510 can be made of PTEE film material, and the non-breathable side of the soft shell sealing ring 510 can be made of rubber material.

[0036] Furthermore, the porous foam 520 can be made of silicone foam material.

[0037] Furthermore, the dust cover 530 can be made of flame-retardant non-woven fabric.

[0038] Furthermore, a limiting groove can be provided on the outer wall of the soft shell sealing ring 510, and the limiting groove can be engaged with the through hole of the orifice seal 200.

[0039] The working principle of the above technical solution is as follows: During use, when the folded bag 320 is fully inflated, the entire device is filled with gas. At this time, the permeable side (such as a PTFE film) of the soft-shell sealing ring 510 allows the gas inside the orifice sealer 200 to slowly permeate into the soft-shell sealing ring 510, while the impermeable side (such as rubber) prevents the gas from leaking out of the hole. The porous structure of the silicone foam material is elastic and can support the soft-shell sealing ring 510 to maintain the contact pressure with the inner wall of the borehole. At the same time, its pores can store the filled gas. The silicone foam expands rapidly, expanding the soft-shell sealing ring 510. The expansion of the soft-shell sealing ring 510 allows the gap between the orifice sealer 200 and the borehole to be sealed, preventing the gas from continuously entering the orifice sealer 200. Gas pressure can easily impact the orifice seal 200, causing it to detach from the borehole and damage the equipment. The flame-retardant non-woven dust cover 530 wraps around the outer wall of the soft shell sealing ring 510, preventing dust and debris from entering the soft shell sealing ring 510 and avoiding clogging of the porous foam 520 and the ventilated side. At the same time, its flame retardancy reduces the safety risks caused by friction between gas and impurities. Based on this, the pressure control system of the buffer component 300 can respond more accurately to changes in gas pressure, further improving the safety and extraction efficiency of the device.

[0040] Furthermore, during use, the present invention facilitates quick assembly and disassembly of the soft shell sealing ring 510 by opening a limiting groove on the soft shell sealing ring 510, enabling flexible installation and replacement, thus enhancing its practicality. The soft shell sealing ring 510 engages with the through hole of the orifice sealer 200 through the limiting groove, achieving a fixed seal with the orifice sealer 200. Its outer wall is tightly fitted with the inner wall of the drilled hole, utilizing its own elasticity to adapt to the unevenness of the inner wall of the drilled hole, thereby improving the sealing fit.

[0041] This invention employs a combination of a soft-shell sealing ring 510, porous foam 520, and a dust cover 530. The soft-shell sealing ring 510, with its design of guiding air on the permeable side and preventing leakage on the impermeable side, allows gas to flow into the orifice sealer 200 while preventing gas leakage to the outside. The elastic support of the silicone porous foam 520 ensures that the soft-shell sealing ring 510 fits tightly against the borehole wall, adapting to different borehole diameters or uneven inner walls, thus solving the problem of poor adaptability of a single sealing method. Furthermore… The soft-shell sealing ring 510, in conjunction with the porous foam 520, allows for the storage of ample gas through its pores. The silicone foam expands rapidly, enlarging the soft-shell sealing ring 510. This enlargement of the soft-shell sealing ring 510 seals the gap between the orifice sealer 200 and the borehole, preventing gas from continuously entering the orifice sealer 200. This overcomes the shortcomings of existing technologies and ensures that gas enters the buffer assembly 300 at a more stable flow rate, facilitating the precise operation of the subsequent pressure control system.

[0042] The contents not described in detail in this description are existing technologies known to those skilled in the art. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas extraction well pressure relief device, comprising a drill rod (100) and a wellhead sealer (200), characterized in that, The orifice seal (200) is sleeved on the drill rod (100), and through holes are provided on both sides of the orifice seal (200). An air supply pipe (201) is fixedly connected to the top of the orifice seal (200). A buffer assembly (300) is provided on the side of the orifice sealer (200). The buffer assembly (300) includes a buffer box (310). One side wall of the buffer box (310) is fixedly connected to the gas supply pipe (201). A folded bag (320) is fixedly connected to the other side wall of the buffer box (310). The buffer box (310) and the folded bag (320) are connected internally. The buffer box (310) has two support shells (330) fixedly connected to the side facing the folded pouch (320). A support rod (340) is inserted into the support shell (330). The support rod (340) is set in an L-shaped structure. The inner wall of the outer end of the support rod (340) abuts against the outer wall of the folded pouch (320). A tension sensor (350) is fixedly installed on the inner side wall of the support shell (330). A support spring (360) is fixedly connected between the tension sensor (350) and the support rod (340).

2. The gas extraction hole pressure relief device according to claim 1, characterized in that, The top of the buffer box (310) is fixedly connected to the extraction pipe (311), and an electric control valve is fixedly installed on the extraction pipe (311). A ventilation slot (312) is opened on the side of the buffer box (310) connected to the folded bag (320).

3. The gas extraction hole pressure relief device according to claim 1, characterized in that, The outer wall of the support shell (330) is provided with a rectangular groove (331), and a display screen (351) is fixedly installed on the tension sensor (350), and the display screen (351) can be directly observed through the rectangular groove (331).

4. The gas extraction hole pressure relief device according to claim 1, characterized in that, The bottom of the gas supply pipe (201) is fixedly connected to the feed pipe (202), and the inner wall of the orifice sealer (200) is fixedly connected to the brush.

5. A gas extraction hole pressure relief device according to claim 1, characterized in that, The orifice sealer (200) is provided with a sealing plug (400) facing the borehole. The sealing plug (400) has a through groove in the middle, and the inner diameter of the through groove of the sealing plug (400) is larger than the diameter of the drill rod (100). The sealing plug (400) has a sealing component (500) on its side wall for sealing the borehole.

6. A gas extraction well pressure relief device according to claim 5, characterized in that, The sealing assembly (500) includes a soft-shell sealing ring (510) fixedly connected to the sealing plug (400). The side wall of the soft-shell sealing ring (510) facing the orifice sealer (200) is made of a breathable material, and the side wall of the soft-shell sealing ring (510) facing the sealing plug (400) is made of an impermeable material. The soft-shell sealing ring (510) is filled with porous foam (520), and the outer wall of the soft-shell sealing ring (510) is covered with a dustproof cover cloth (530).

7. A gas extraction hole pressure relief device according to claim 6, characterized in that, The breathable side of the soft shell sealing ring (510) can be made of PTEE film material, and the non-breathable side of the soft shell sealing ring (510) can be made of rubber material.

8. A gas extraction well pressure relief device according to claim 6, characterized in that, The porous foam (520) can be made of silicone foam material.

9. A gas extraction well pressure relief device according to claim 6, characterized in that, The dust cover (530) can be made of flame-retardant non-woven fabric.

10. A gas extraction well pressure relief device according to claim 6, characterized in that, The outer wall of the soft shell sealing ring (510) may be provided with a limiting groove, which is engaged with the through hole of the orifice seal (200).

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