Combined coal mine gas outburst multi-stage pressure relief anti-outburst device

Abstract

The application discloses a combined coal mine gas outburst multistage pressure relief anti-outburst device, relates to the technical field of gas anti-outburst, and comprises a pressure relief pipeline one connected with an external high-pressure pump and extraction equipment; a plurality of pressure relief pipeline twos are arranged, are threadedly connected on the pressure relief pipeline one through grading assemblies, and the plurality of pressure relief pipeline twos are connected through grading assemblies; a plurality of separation rings are arranged, are fixed on the outer walls of the plurality of grading assemblies respectively, and the pressure relief pipeline one and the plurality of pressure relief pipeline twos are sealed by being attached to the separation rings; a plugging device is sleeved on the plurality of separation rings; a plurality of first pressure relief assemblies are arranged, and are circumferentially arranged on the pressure relief pipeline one and the pressure relief pipeline twos; a plurality of second pressure relief assemblies are arranged, are circumferentially arranged on the pressure relief pipeline one and the pressure relief pipeline twos, and are staggered with the plurality of first pressure relief assemblies.

Description

Technical Field

[0001] This invention belongs to the field of coal mine gas outburst prevention technology, and specifically provides a combined multi-stage pressure relief and outburst prevention device for coal mine gas outbursts. Background Technology

[0002] Coal and gas outburst prevention (also known as coal and gas outburst control) is a core technology in coal mine safety production. Its core principle is to disrupt the conditions for outbursts by actively reducing or eliminating key factors that trigger outbursts (mainly ground stress, gas pressure, and coal strength). Its core principle is based on the "three-in-one" outburst mechanism hypothesis (i.e., outbursts are the result of the combined effects of ground stress, gas pressure, and the physical and mechanical properties of the coal).

[0003] Existing gas outburst prevention devices cannot effectively perform multi-stage pressure relief and outburst prevention based on gas pressure at different coal mine depths. Excessive pressure relief intensity can lead to the expansion of cracks in the roof strata, causing large-scale roof collapses. Insufficient pressure relief intensity can prevent the release of gas pressure and thus fail to effectively prevent outbursts. Furthermore, relying on a single pressure relief method results in a long pressure relief time. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a combined multi-stage pressure relief and outburst prevention device for coal mine gas outbursts, comprising:

[0005] Pressure relief pipeline one is connected to an external high-pressure pump and extraction equipment;

[0006] Multiple pressure relief pipes are configured and are threadedly connected to the pressure relief pipe 1 using a graded assembly, and the multiple pressure relief pipes 2 are connected to each other using a graded assembly;

[0007] Multiple partition rings are configured and fixed to the outer wall of multiple graded components, and the first pressure relief pipe and multiple second pressure relief pipes are all fitted and sealed with the partition rings;

[0008] The occluder is fitted onto the plurality of said separator rings;

[0009] The first pressure relief assembly is configured in multiple parts and arranged circumferentially on the first pressure relief pipe and the second pressure relief pipe;

[0010] The second pressure relief assembly is configured in multiples, arranged circumferentially on the first pressure relief pipe and the second pressure relief pipe, and staggered with the multiple first pressure relief assemblies.

[0011] Further, preferably, the first pressure relief pipe and the second pressure relief pipe have the same structure, both including:

[0012] An outer tube, with an inner tube coaxially fixed inside it;

[0013] A fracturing channel is formed inside the inner tube and is connected to the first pressure relief component;

[0014] An extraction channel is formed between the outer tube and the inner tube and is connected to the second pressure relief component. The separator ring has multiple connecting holes at positions corresponding to the extraction channel.

[0015] Further, preferably, the hierarchical component includes:

[0016] A connecting tube, wherein a partition ring is fixed in the middle, and the outer wall of the connecting tube is threaded, with the threads on both sides of the partition ring having opposite directions of rotation;

[0017] A classifying disc is fixed inside the connecting tube, and a flow hole is provided in the middle of the disc, which communicates with the fracturing channel.

[0018] The fixing bracket is fixed inside the flow hole;

[0019] A sealing frame is slidably disposed on the fixed frame on the side away from the pressure relief pipe, and a pressing spring is provided between the sealing frame and the fixed frame. The sealing frame has the same shape as the fixed frame.

[0020] Multiple adjustment components are configured and circumferentially fixed to the side of the grading disc away from the fixing frame.

[0021] Further, preferably, the adjustment component includes:

[0022] The fastener is fixed to the grading disc;

[0023] The limiting plate is fixed inside the fixing member;

[0024] The adjusting cylinder is threadedly connected inside the limiting plate;

[0025] A sliding column is slidably disposed inside the adjusting cylinder, and a sealing spring is provided between the column and the adjusting cylinder;

[0026] A sliding rod is fixed to the sliding column and is slidably disposed with respect to the fixing member;

[0027] The sealing plate is fixed to the sliding rod.

[0028] Furthermore, preferably, the adjusting cylinder and the limiting plate are arranged at an angle, the contact position of the sealing plates in the plurality of adjusting components corresponds to the sealing frame, and the compression strength of the sealing spring gradually increases with the drilling depth.

[0029] Further, preferably, the first pressure relief component includes:

[0030] A pressure relief pipe is fixed on the outer pipe and the inner pipe, and a sealing groove is provided at one end of the pressure relief pipe near the inner pipe;

[0031] Adjusting ring one is threadedly connected inside the pressure relief pipe near the outer pipe, and a sealing groove two is provided inside the adjusting ring one;

[0032] The adjusting column is fixed on the adjusting ring one;

[0033] The sliding disc has multiple sliding strips on its outer wall that are slidably disposed inside the pressure relief pipe. A spring is provided between the sliding disc and the adjusting ring, and a spring is provided between the sliding disc and the bottom of the pressure relief pipe.

[0034] The first sealing head is fixed inside the sliding disc.

[0035] Further, preferably, the elastic force of the first spring is greater than that of the second spring, and the first sealing head is in contact with the first sealing groove when it is in the initial position. At this time, the first sealing head and the second sealing groove are not in contact, and the outer diameter of the sliding disc is smaller than the inner diameter of the pressure relief pipe.

[0036] Further, preferably, the second pressure relief assembly includes:

[0037] The extraction pipe is fixed to the outer pipe;

[0038] Adjusting ring two is threadedly connected inside the extraction tube at a position away from the inner tube, and a handle is fixed on adjusting ring two;

[0039] Two support plates are configured in a cross arrangement and fixed to the extraction pipe near the inner pipe.

[0040] The second sealing head is slidably disposed above the support plate, and a third spring is disposed between the sealing head and the support plate, the spring force of the third spring being greater than the water injection pressure.

[0041] The beneficial effects of using this invention are:

[0042] In this invention, by cooperating with a sealing device and a pressure relief pipe 1 and multiple pressure relief pipes 2 in the anti-outburst pressure relief borehole, multiple independent sealed chambers are formed in the borehole. Each chamber is independently controlled by its corresponding grading plate, regulating component, first pressure relief component and second pressure relief component, realizing the physical zoning and grading of the borehole. It can independently control the fracturing water injection and gas extraction of each section, prevent mutual interference between different areas, effectively reduce the outburst risk of coal bodies at different depths, and the opening and closing of the grading component, the first pressure relief component and the second pressure relief component are automatically triggered based on preset pressure thresholds, avoiding excessive pressure relief in shallow layers or ineffective pressure relief in deep layers, thus improving the anti-outburst effect. Attached Figure Description

[0043] Figure 1 This is a schematic diagram showing the overall structure of the present invention;

[0044] Figure 2 This is a schematic diagram of the pressure relief pipe structure of the present invention;

[0045] Figure 3 This is a schematic diagram of the hierarchical component structure of the present invention;

[0046] Figure 4 This is a schematic diagram of the adjustment component structure of the present invention;

[0047] Figure 5 This is a schematic diagram of the first pressure relief component of the present invention;

[0048] Figure 6 This is a schematic diagram of the second pressure relief component of the present invention;

[0049] The reference numerals in the figures include:

[0050] 1. Pressure relief pipeline one; 11. Outer pipe; 12. Inner pipe; 13. Fracturing channel; 14. Extraction channel;

[0051] 2. Grading assembly; 21. Connecting pipe; 22. Grading disc; 23. Flow hole; 24. Fixing bracket; 25. Sealing bracket; 26. Adjusting assembly; 261. Fixing element; 262. Limiting plate; 263. Adjusting cylinder; 264. Sliding column; 265. Sliding rod; 266. Sealing plate;

[0052] 3. Sealing device; 4. Pressure relief pipe two; 5. Separating ring;

[0053] 6. First pressure relief assembly; 61. Pressure relief pipe; 62. Adjusting ring one; 63. Adjusting column; 64. Sliding disc; 65. Sliding strip; 66. Sealing head one; 67. Spring one; 68. Spring two;

[0054] 7. Second pressure relief assembly; 71. Extraction pipe; 72. Adjusting ring II; 73. Sealing head II; 74. Support plate; 75. Spring III. Detailed Implementation

[0055] The present invention will now be described in detail with reference to the accompanying drawings.

[0056] Reference Figures 1-6 A combined multi-stage pressure relief and outburst prevention device for coal mine gas outbursts, comprising:

[0057] Pressure relief pipeline 1 is connected to an external high-pressure pump and extraction equipment;

[0058] Multiple pressure relief pipes 4 are configured and are threadedly connected to the pressure relief pipe 1 using a graded assembly 2, and the multiple pressure relief pipes 4 are connected to each other using the graded assembly 2.

[0059] Multiple partition rings 5 ​​are configured and fixed to the outer wall of multiple graded components 2 respectively, and the first pressure relief pipe 1 and multiple second pressure relief pipes 4 are all sealed to the partition rings 5;

[0060] The plugger 3 is fitted onto the plurality of the separating rings 5;

[0061] The first pressure relief assembly 6 is configured as multiple and arranged circumferentially on the pressure relief pipe 1 and the pressure relief pipe 4.

[0062] The second pressure relief component 7 is configured in multiples, arranged circumferentially on the first pressure relief pipe 1 and the second pressure relief pipe 4, and is staggered with the multiple first pressure relief components 6.

[0063] It should be noted that the end of the pressure relief pipe 1 away from the grading component 2 is in a closed state. It is connected to the external high-pressure pump and extraction equipment through a hose, and the entire device is located in the pressure relief borehole.

[0064] In this embodiment, the pressure relief pipe 1 and the pressure relief pipe 4 have the same structure, both including:

[0065] The outer tube 11 has an inner tube 12 coaxially fixed inside it;

[0066] The fracturing channel 13 is opened inside the inner tube 12 and is connected to the first pressure relief component 6;

[0067] The extraction channel 14 is opened between the outer tube 11 and the inner tube 12 and is connected to the second pressure relief component 7. The separator ring 5 has multiple connecting holes at the corresponding positions of the extraction channel 14.

[0068] In other words, high-pressure liquid is injected through the fracturing channel 13 to fracture and depressurize the coal body, while gas and liquid in the coal body are extracted through the extraction pipeline 14, thereby achieving multi-stage synchronous depressurization and improving depressurization efficiency.

[0069] In a preferred embodiment, the hierarchical component 2 includes:

[0070] The connecting tube 21 has a partition ring 5 fixed in the middle. The outer wall of the connecting tube 21 is threaded, and the threads on both sides of the partition ring 5 are in opposite directions.

[0071] The classifying disc 22 is fixed inside the connecting pipe 21, and a flow hole 23 is provided in the middle of it, which is connected to the fracturing channel 13.

[0072] The fixing bracket 24 is fixed inside the flow hole 23;

[0073] A sealing frame 25 is slidably disposed on the fixed frame 24 on the side away from the pressure relief pipe 1, and a pressing spring is provided between the sealing frame 25 and the fixed frame 24. The sealing frame 25 has the same shape as the fixed frame 24.

[0074] Adjustment components 26 are configured in multiples and are circumferentially fixed to the side of the grading disc 22 away from the fixing frame 24.

[0075] The flow hole 23 is sealed by multiple adjusting components 26 and sealing frame 25, thereby relieving pressure in the borehole in sections and avoiding excessive pressure relief in the shallow layer and insufficient pressure relief in the deep layer.

[0076] It should be noted that the high-pressure liquid flows from the direction of the sealing frame 25 to the direction of the regulating component 26, so that the regulating component 26 can be opened adaptively by pressure.

[0077] In a preferred embodiment, the adjustment component 26 includes:

[0078] Fixing member 261 is fixed on the grading disc 22;

[0079] Limiting plate 262 is fixed inside the fixing member 261;

[0080] Adjusting cylinder 263 is threadedly connected inside the limiting plate 262;

[0081] The sliding column 264 is slidably disposed inside the adjusting cylinder 263, and a sealing spring is provided between the column and the adjusting cylinder 263;

[0082] The sliding rod 265 is fixed on the sliding column 264 and is slidably disposed with the fixing member 261;

[0083] The sealing plate 266 is fixed on the sliding rod 265.

[0084] In a preferred embodiment, the adjusting cylinder 263 and the limiting plate 262 are arranged at an angle, the contact position of the sealing plates 266 in the plurality of adjusting components 26 corresponds to the sealing frame 25, and the compression strength of the sealing spring gradually increases with the drilling depth.

[0085] In other words, the deeper the drilling depth, the closer the adjusting cylinder 263 is to the sliding rod 265, thereby increasing the compression of the sealing spring. Furthermore, the sliding direction of the sealing plate 266 is inclined, which can generate horizontal and vertical components when closed, thus facilitating the bonding of multiple sealing plates 266 and pressing the sealing frame 25 to enhance the sealing strength.

[0086] In a preferred embodiment, the first pressure relief component 6 includes:

[0087] A pressure relief pipe 61 is fixed on the outer pipe 11 and the inner pipe 12, and a sealing groove is provided at one end of the pressure relief pipe 61 near the inner pipe 12.

[0088] Adjusting ring 62 is threadedly connected inside the pressure relief pipe 61 near the outer pipe 11, and a sealing groove 2 is provided inside the adjusting ring 62.

[0089] Adjusting column 63 is fixed on adjusting ring 62;

[0090] The sliding disc 64 has multiple sliding strips 65 slidably disposed inside the pressure relief pipe 61 on its outer wall, and a spring 67 is provided between the sliding disc 64 and the adjusting ring 62, and a spring 68 is provided at the bottom of the sliding disc 64 and the pressure relief pipe 61.

[0091] The sealing head 66 is fixed inside the sliding disk 64.

[0092] In a preferred embodiment, the elastic force of the first spring 67 is greater than that of the second spring 68. When the first sealing head 66 is in its initial position, it fits and seals against the first sealing groove. At this time, the first sealing head 66 does not contact the second sealing groove. The outer diameter of the sliding disc 64 is smaller than the inner diameter of the pressure relief pipe 61.

[0093] When depressurizing the shallow layer, the injected high-pressure liquid pushes the plug head 66 to slide, thus disengaging it from the sealing groove 1. This allows the high-pressure liquid to enter the borehole for fracturing. At this point, the liquid pressure is insufficient to completely overcome the elastic force of the spring 67. In other words, the plug head 66 is not in contact with either the sealing groove 1 or the sealing groove 2. The liquid pressure is also lower than the closing pressure of the regulating component 26, thus allowing for zoned depressurization. As the liquid pressure continues to increase, the liquid pushes the plug head 66 to continue sliding, causing it to contact and seal with the sealing groove 2, completing the depressurization and anti-outburst process for this area. At this point, the liquid pressure is greater than the closing pressure of the regulating component 26, causing multiple regulating components 26 to open. This allows the high-pressure liquid to enter the next area for depressurization, preventing excessive depressurization from causing the expansion of cracks in the roof strata and triggering a large-scale roof collapse.

[0094] In a preferred embodiment, the second pressure relief assembly 7 includes:

[0095] The extraction pipe 71 is fixed to the outer pipe 11;

[0096] Adjusting ring 2 72 is threadedly connected to a position inside the extraction tube 71 away from the inner tube 12, and a handle is fixed on the adjusting ring 2 72;

[0097] Two support plates 74 are configured in a cross arrangement and fixed to the extraction pipe 71 near the inner pipe 12.

[0098] The second sealing head 73 is slidably disposed above the support plate 74, and a third spring 75 is disposed between the sealing head 73 and the support plate 74. The elastic force of the third spring 75 is greater than the water injection pressure.

[0099] In other words, when the high-pressure liquid is injected into the borehole, the liquid pressure is insufficient to push the plug head 2 73 to slide. As the fracturing gas of the coal body overflows, the extraction equipment is turned on to perform negative pressure extraction, and together with the pressure of the high-pressure liquid, the plug head 2 73 is pushed to slide, thereby completing the extraction and depressurization and improving the depressurization efficiency.

[0100] It is important to note that the negative pressure extraction intensity is insufficient to open the second sealing head 73 in the deep layer, thus avoiding excessive pressure relief in the deep layer. When the gas pressure in the deep coal seam undergoes a sudden change, that is, when the gas pressure suddenly increases, the pressure can push the second sealing head 73 to slide, thereby relieving pressure autonomously. After the pressure decreases, the second sealing head 73 is reset by the third spring 75, and it will open again to relieve pressure when hydraulic fracturing occurs, thus avoiding sudden situations and improving safety.

[0101] In practice, firstly, the coal body is surveyed using surveying equipment to determine the required pressure relief intensity for each area. Then, multiple grading components 2, the first pressure relief component 6, and the second pressure relief component 7 are manually adjusted to adapt to the pressure of the coal body at different depths. Next, pressure relief pipe 1 and multiple pressure relief pipes 4 are connected through multiple grading components 2. It is important to note that sealant is applied to all threaded connections to improve the sealing effect. After that, the connected pipes are placed into the borehole and divided into sections using a plugger 3. Then, multi-stage pressure relief is performed in each section using an external high-pressure pump and extraction equipment to improve the pressure relief effect.

[0102] The above content is only a preferred embodiment of the present invention. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the concept of the present invention. As long as these changes do not depart from the concept of the present invention, they all fall within the protection scope of the present invention.

Claims

1. A combined multi-stage pressure relief and outburst prevention device for coal mine gas outbursts, characterized in that, This includes a pressure relief pipeline, which is connected to an external high-pressure pump and extraction equipment; Multiple pressure relief pipes are configured and are threadedly connected to the pressure relief pipe 1 using a graded assembly, and the multiple pressure relief pipes 2 are connected to each other using a graded assembly; Multiple partition rings are configured and fixed to the outer wall of multiple graded components, and the first pressure relief pipe and multiple second pressure relief pipes are all fitted and sealed with the partition rings; The occluder is fitted onto the plurality of said separator rings; The first pressure relief assembly is configured in multiple parts and arranged circumferentially on the first pressure relief pipe and the second pressure relief pipe; The second pressure relief assembly is configured in multiple ways, arranged circumferentially on the first pressure relief pipe and the second pressure relief pipe, and staggered with the multiple first pressure relief assemblies; The pressure relief pipe one and pressure relief pipe two have the same structure, both including: An outer tube, with an inner tube coaxially fixed inside it; A fracturing channel is formed inside the inner tube and is connected to the first pressure relief component; An extraction channel is formed between the outer tube and the inner tube and is connected to the second pressure relief component. The separator ring has multiple connecting holes at positions corresponding to the extraction channel. The hierarchical component includes: A connecting tube, wherein a partition ring is fixed in the middle, and the outer wall of the connecting tube is threaded, with the threads on both sides of the partition ring having opposite directions of rotation; A classifying disc is fixed inside the connecting tube, and a flow hole is provided in the middle of the disc, which communicates with the fracturing channel. The fixing bracket is fixed inside the flow hole; A sealing frame is slidably disposed on the fixed frame on the side away from the pressure relief pipe, and a pressing spring is provided between the sealing frame and the fixed frame. The sealing frame has the same shape as the fixed frame. Multiple adjustment components are configured and circumferentially fixed to the side of the grading disc away from the fixing frame.

2. The combined multi-stage pressure relief and outburst prevention device for coal mine gas outbursts according to claim 1, characterized in that, The adjustment component includes: The fastener is fixed to the grading disc; The limiting plate is fixed inside the fixing member; The adjusting cylinder is threadedly connected inside the limiting plate; A sliding column is slidably disposed inside the adjusting cylinder, and a sealing spring is provided between the column and the adjusting cylinder; A sliding rod is fixed to the sliding column and is slidably disposed with respect to the fixing member; The sealing plate is fixed to the sliding rod.

3. A combined multi-stage pressure relief and outburst prevention device for coal mine gas outbursts according to claim 2, characterized in that, The adjusting cylinder and the limiting plate are arranged at an angle, the sealing plates in the multiple adjusting components are connected at positions corresponding to the sealing frame, and the compression strength of the sealing spring gradually increases with the drilling depth.

4. A combined multi-stage pressure relief and outburst prevention device for coal mine gas outbursts according to claim 1, characterized in that, The first pressure relief component includes: A pressure relief pipe is fixed on the outer pipe and the inner pipe, and a sealing groove is provided at one end of the pressure relief pipe near the inner pipe; Adjusting ring one is threadedly connected inside the pressure relief pipe near the outer pipe, and a sealing groove two is provided inside the adjusting ring one; The adjusting column is fixed on the adjusting ring one; The sliding disc has multiple sliding strips on its outer wall that are slidably disposed inside the pressure relief pipe. A spring is provided between the sliding disc and the adjusting ring, and a spring is provided between the sliding disc and the bottom of the pressure relief pipe. The first sealing head is fixed inside the sliding disc.

5. A combined multi-stage pressure relief and outburst prevention device for coal mine gas outbursts according to claim 4, characterized in that, The elastic force of the first spring is greater than that of the second spring. When the first sealing head is in its initial position, it fits and seals with the first sealing groove. At this time, the first sealing head does not contact the second sealing groove. The outer diameter of the sliding disc is smaller than the inner diameter of the pressure relief pipe.

6. A combined multi-stage pressure relief and outburst prevention device for coal mine gas outbursts according to claim 5, characterized in that, The second pressure relief assembly includes: The extraction pipe is fixed to the outer pipe; Adjusting ring two is threadedly connected inside the extraction tube at a position away from the inner tube, and a handle is fixed on adjusting ring two; Two support plates are configured in a cross arrangement and fixed to the extraction pipe near the inner pipe. The second sealing head is slidably disposed above the support plate, and a third spring is disposed between the sealing head and the support plate, the spring force of the third spring being greater than the water injection pressure.

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