Orifice pressure measuring structure of coal mine drill hole

Abstract

The utility model relates to the technical field of coal mining, in particular to an orifice pressure measuring structure of a coal mine drill hole. Comprising a pressure measuring pipeline connected with a connecting pipe in a drill hole, at least two pressure detecting assemblies are arranged on the pressure measuring pipeline in parallel, the outer end of the pressure measuring pipeline is connected with a gas discharging pipeline, and the gas discharging pipeline is connected to an air return way. Through the design that the at least two pressure detection assemblies are arranged on the pressure measuring pipeline in parallel, the technical problem that data distortion is caused due to the fact that a traditional single-pressure-gauge monitoring mode is prone to failure in an underground humid vibration environment is effectively solved, and abnormal data can be recognized in time through a multi-gauge comparison mechanism when any pressure gauge is damaged; overall replacement of the multiple pressure detection assemblies is carried out in time, it is guaranteed that the readings of the multiple pressure detection assemblies connected in parallel are consistent, and the monitoring stability is guaranteed; through the closed design that the gas discharge pipeline is connected to the return airway, potential safety hazards caused by directly discharging gas to the operation roadway in a traditional method are overcome, and controllable dredging of high-pressure gas is achieved.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, specifically a borehole pressure measuring structure for coal mine drilling. Background Technology

[0002] Mine gas pressure monitoring is a crucial technical means for preventing gas disasters and plays a key role in the coal mine safety production system. With the continuous increase in coal mining depth, the pressure and content of coal seam gas rise significantly, placing higher demands on the reliability and safety of gas monitoring equipment. Current coal mine safety regulations explicitly require real-time monitoring of gas pressure at the mining face to provide data support for gas drainage and disaster early warning. However, in complex underground environments, traditional monitoring methods face numerous technical challenges.

[0003] Current technologies commonly employ a single pressure gauge directly connected to the borehole for monitoring. This structure has significant limitations in practical applications. The damp, water-rich underground working environment easily leads to moisture damage and failure of the internal components of the pressure gauge. Vibrations and collisions during equipment operation and material transportation often cause mechanical damage to the instrument. When a single pressure gauge malfunctions, the monitoring system completely loses its data acquisition capability, affecting the timeliness of gas control decisions. Furthermore, traditional methods typically release high-pressure gas from the borehole directly into the working roadway after pressure testing. This approach can cause localized gas accumulation, increasing the burden on the ventilation system and potentially leading to safety hazards such as gas exceedances under certain conditions. To address these issues, there is an urgent need to improve the structural design of existing borehole pressure measuring devices, enhancing the system's environmental adaptability and safety reliability while ensuring measurement accuracy. Utility Model Content

[0004] The present invention aims to solve the above problems and thus provide a borehole pressure measurement structure for preventing gas from entering the roadway.

[0005] The technical solution adopted by this utility model to solve the aforementioned problem is:

[0006] A pressure measuring structure at the borehole opening of a coal mine borehole includes a pressure measuring pipeline connected to a connecting pipe inside the borehole, at least two pressure detection components are connected in parallel on the pressure measuring pipeline, and a gas emission pipeline is connected to the outer end of the pressure measuring pipeline, which is connected to the return airway.

[0007] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are:

[0008] By designing at least two pressure detection components connected in parallel on the pressure measuring pipeline, the technical problem of data distortion caused by the easy failure of traditional single pressure gauge monitoring in the humid and vibrating environment downhole is effectively solved. The multi-gauge comparison mechanism can identify abnormal data in time when any pressure gauge is damaged, and replace multiple pressure detection components in time to ensure that the readings of multiple pressure detection components connected in parallel are consistent and to ensure the stability of monitoring. By connecting the gas emission pipeline to the return airway in a closed design, the safety hazards caused by the direct emission of gas into the working roadway in the traditional method are overcome, and the high-pressure gas can be controlled and discharged.

[0009] As a preferred embodiment, a further technical solution of this utility model is:

[0010] Furthermore, the pressure detection component includes a pressure gauge, and a branch is provided on the pressure testing pipeline, with the end of the branch connected to the pressure gauge.

[0011] Furthermore, pressure testing valves are installed on the branch lines to achieve single-branch isolation function, which can cut off the airflow to prevent gas leakage when the pressure gauge is replaced.

[0012] Furthermore, the pressure gauge is equipped with a waterproof protective cover on the outside. The waterproof protective cover has a physical isolation layer that effectively prevents water and dust from the well from entering the internal mechanism of the pressure gauge, thus extending the service life of the instrument in humid environments.

[0013] Furthermore, a pressure-resistant rubber hose is installed between the pressure measuring pipeline and the gas emission pipeline. The flexible connection structure absorbs the vibration energy of the equipment, reduces the impact of mechanical shock on the pressure gauge, and facilitates pipeline route adjustment to adapt to the space constraints of the roadway.

[0014] Furthermore, a pressure relief ball valve is installed at the end of the pressure-resistant rubber hose. The ball valve's rapid opening and closing characteristics enable precise control of gas emission. The full-bore design ensures that high-pressure gas can be quickly introduced into the extraction system, avoiding airflow blockage at the valve.

[0015] Furthermore, a metal filter screen is installed at the inlet of the connecting pipe. The filter structure intercepts solid impurities such as coal dust in the borehole to prevent the pipeline from being blocked and affecting the accuracy of pressure transmission. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0017] The following are labeled in the diagram: 1. Pressure testing pipeline; 2. Gas discharge pipeline; 3. Pressure gauge; 4. Pressure testing valve; 5. Pressure-resistant rubber hose; 6. Pressure relief ball valve. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments, the purpose of which is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0019] A pressure measuring structure for a coal mine borehole includes a pressure measuring pipe 1 connected to a connecting pipe inside the borehole. The pressure measuring pipe 1 has a diameter of four inches. At least two pressure detection components are connected in parallel on the pressure measuring pipe 1. In this embodiment, two sets of pressure detection components are provided. The outer end of the pressure measuring pipe 1 is connected to a gas emission pipe 2, which is connected to the return airway.

[0020] Furthermore, the pressure detection assembly includes a pressure gauge 3, and a branch is provided on the pressure measuring pipeline 1. The branch has a diameter of 20mm, and the end of the branch is connected to the pressure gauge 3.

[0021] Furthermore, a pressure testing valve 4 is installed on the branch line. The pressure testing valve 4 is a cock valve, which realizes the isolation function of a single branch line. When the pressure gauge 3 is replaced, the airflow can be cut off to prevent gas leakage.

[0022] Furthermore, the pressure gauge 3 is equipped with a waterproof protective cover on the outside. The waterproof protective cover has a physical isolation layer, which effectively prevents water and dust from the well from entering the internal mechanism of the pressure gauge 3, and extends the service life of the instrument in humid environments.

[0023] Furthermore, a pressure-resistant rubber hose 5 is installed between the pressure measuring pipeline 1 and the gas discharge pipeline 2. The pressure-resistant rubber hose 5 has a diameter of 20mm. The flexible connection structure absorbs vibration energy, reduces the impact of mechanical shock on the pressure gauge 3, and facilitates pipeline route adjustment to adapt to the space constraints of the roadway.

[0024] Furthermore, a pressure relief ball valve 6 is installed at the end of the pressure-resistant rubber hose 5. The ball valve's rapid opening and closing characteristics enable precise control of gas emission. The full-bore design ensures that high-pressure gas can be quickly introduced into the extraction system, avoiding airflow blockage at the valve.

[0025] Furthermore, a metal filter screen is installed at the inlet of the connecting pipe. The filter structure intercepts solid impurities such as coal dust in the borehole to prevent the pipeline from being blocked and affecting the accuracy of pressure transmission.

[0026] First, after drilling is completed, the pressure measuring pipeline 1 is connected to the borehole connecting pipe via a flange seal. At this time, the detachable metal filter at the inlet of the pressure measuring pipeline 1 can effectively intercept solid impurities such as coal dust, preventing pipeline blockage. Then, the pressure measuring valves 4 on the two sets of parallel branches are opened, allowing the gas pressure inside the borehole to be simultaneously transmitted to the two pressure gauges 3 through the pressure measuring pipeline 1. The waterproof protective cover installed on the outside of the pressure gauges 3 forms a physical isolation layer, blocking the intrusion of water and dust from the well, ensuring measurement accuracy in a humid and vibrating environment. During monitoring, if a deviation is found in the readings of the two pressure gauges 3, the pressure measuring valves 4 are immediately closed to cut off the airflow. Two pressure gauges 3 are replaced to ensure measurement consistency. The dual-gauge design effectively solves the problem of data distortion that cannot be identified when the instrument is damaged in traditional single-gauge monitoring. After the pressure gauge 3 readings are consistent and stable, the pressure measuring valve 4 is closed and the pressure relief ball valve 6 at the end of the pressure-resistant rubber hose 5 is opened to safely introduce the high-pressure gas in the pipeline into the return airway through the gas discharge pipeline 2. This closed discharge system completely avoids the safety hazards caused by directly discharging gas into the working roadway in the traditional way, and realizes the controllable drainage of high-pressure gas. The whole process solves the technical defects of existing technology such as easy instrument damage, poor data reliability and unsafe discharge through structural optimization.

[0027] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A borehole mouth pressure measurement structure for a coal mine borehole, comprising a pressure measurement line connected to a connection pipe in the borehole, characterised in that: The at least two pressure detection components are arranged in parallel on the pressure measuring pipeline, and the outer end of the pressure measuring pipeline is connected with a gas discharge pipeline connected to the air return lane.

2. A borehole pressure measurement structure for a coal mine borehole according to claim 1, characterised in that: The pressure detection component comprises a pressure gauge, and a branch is arranged on the pressure measuring pipeline, with the end of the branch connected with the pressure gauge.

3. A borehole pressure measurement structure for a coal mine borehole according to claim 2, characterised in that: A pressure measuring valve is arranged on the branch.

4. The borehole pressure measurement structure for coal drilling according to claim 2, characterized by: A waterproof protective cover is arranged on the outer side of the pressure gauge.

5. The borehole pressure measurement structure for coal drilling according to claim 1, characterized by: A pressure-resistant rubber hose is arranged between the pressure measuring pipeline and the gas discharge pipeline.

6. A borehole pressure measurement structure for a coal mine borehole according to claim 5 wherein: A pressure relief ball valve is arranged at the end of the pressure-resistant rubber hose.

7. The borehole pressure measurement structure for coal drilling according to claim 1, characterized by: A metal filter screen is arranged at the inlet of the connecting pipe.

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