CN110617915A - Calibration system and method for coal and gas outburst dynamic pressure sensor - Google Patents
Calibration system and method for coal and gas outburst dynamic pressure sensor Download PDFInfo
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- CN110617915A CN110617915A CN201910929755.2A CN201910929755A CN110617915A CN 110617915 A CN110617915 A CN 110617915A CN 201910929755 A CN201910929755 A CN 201910929755A CN 110617915 A CN110617915 A CN 110617915A
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- dynamic pressure
- pressure sensor
- coal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
Abstract
The invention discloses a system and a method for calibrating a coal and gas outburst dynamic pressure sensor, which comprises a gas generating device, a gas distributing device, N dynamic pressure sensors and a terminal, wherein the gas generating device is used for generating gas; the output end of the gas generating device is connected with the input end of the gas shunting device, the output end of the gas shunting device is connected with the input end of the dynamic pressure sensor, and the output end of the dynamic pressure sensor is connected with the terminal. The gas pressure value in each gas outlet channel is detected and displayed on the terminal by evenly distributing the gas and enabling the gas to flow through the gas outlet channels and enter the corresponding dynamic pressure sensors. If the pressure values are consistent, the pressure measurement consistency of the dynamic pressure sensor is better; if the pressure values are not consistent, the parameters of the dynamic pressure sensor can be adjusted through the terminal to enable the pressure values measured by the dynamic pressure sensor to be consistent, so that the consistency of the transient impact pressure measurement of gas-solid two-phase flow in the coal and gas outburst process is improved.
Description
Technical Field
The invention relates to the technical field of pressure control, in particular to a system and a method for calibrating a coal and gas outburst dynamic pressure sensor.
Background
The coal and gas outburst is used as an extremely complex dynamic disaster in mine production, the transient property in the occurrence process of the coal and gas outburst causes the measurement of the outburst two-phase flow disaster-causing characteristic to have certain difficulty, a static pressure sensor is commonly used in the existing test process and is used for measuring the impact force of the two-phase flow of the coal and gas outburst, but the static pressure sensor cannot completely simulate the change process of the measured pressure in a simulation test field. There is little dynamic pressure test system for the impact force test of the protruding two-phase flow.
In the measurement of shock waves in the blasting field, the calibration of dynamic pressure sensors is always a difficult problem, and a single dynamic pressure sensor is calibrated successively in a general way of calibrating a static pressure sensor with multiple purposes. The core problem of measuring the process quantity is the consistency and difference of the sensor test, so that a plurality of dynamic pressure sensors are required to be arranged at different positions, and the pressure difference is simulated by measuring a plurality of pressures simultaneously, thereby obtaining the pressure change process. In addition, if the dynamic pressure sensors are not calibrated with the same precision, an error may exist in the calculation of the pressure difference between the plurality of dynamic pressure sensors, which may reduce the measurement precision.
Disclosure of Invention
Aiming at the problem of poor consistency of initial pressure values measured by a plurality of dynamic pressure sensors in the prior art, the invention provides a system and a method for calibrating a coal and gas outburst dynamic pressure sensor, which are used for correcting parameters of the plurality of dynamic pressure sensors to ensure that the initial pressure values of the plurality of dynamic pressure sensors are the same when measuring pressure.
In order to achieve the purpose, the invention provides the following technical scheme:
a calibration system for coal and gas outburst dynamic pressure sensors comprises a gas generating device and a terminal, and further comprises a gas distributing device and N dynamic pressure sensors, wherein N is more than or equal to 2 and is a positive integer;
the input end of the gas shunting device is connected with the output end of the gas generating device, the output end of the gas shunting device is respectively connected with the input ends of the N dynamic pressure sensors, and the output ends of the dynamic pressure sensors are connected with the terminal.
Preferably, the gas distribution device comprises a cylindrical main body, wherein a gas inlet is formed in the center of the upper surface of the cylindrical main body, N gas outlet holes are evenly distributed in the side surface of the cylindrical main body, and the N gas outlet holes are connected with the gas inlet through N gas outlet channels. The gas shunting device is used for averagely shunting gas and ensuring that the pressure at each gas outlet is consistent.
Preferably, the air outlet channel is circular, and the interior of the air outlet channel is of a threaded structure. The dynamic pressure sensor is convenient to be arranged on the gas shunting device.
Preferably, the main body of the gas distribution device is internally provided with a guide ball, and the guide ball is respectively connected with the N gas outlet channels. The gas distributing device has the function of ensuring that gas can evenly flow into each gas outlet channel after entering the gas distributing device from the gas inlet hole, thereby ensuring the consistency of pressure in each gas outlet channel.
Preferably, the radius of the cylindrical main body is 100-200 mm, and the height of the cylindrical main body is 30-50 mm; the radius of the air inlet hole is 25-30 mm, and the depth is 20-30 mm; the radius of venthole is 4 ~ 6 mm.
The invention also provides a calibration method of the coal and gas outburst dynamic pressure sensor, which comprises the following steps:
s1: the gas generating device inputs gas into the gas shunting device for gas shunting, the N dynamic pressure sensors respectively measure the gas pressure at each gas outlet in the gas shunting device, and the terminal receives and analyzes the gas pressure data;
s2: and when the gas pressure data are not the same, adjusting the parameters of the dynamic pressure sensors, and repeating the step S1 until the gas pressure data measured by the N dynamic pressure sensors are the same.
Preferably, in step S2, the method for adjusting the parameters of the dynamic pressure sensor includes:
the method comprises the steps of taking gas pressure data A measured by any one of N dynamic pressure sensors as a standard, increasing the sensitivity of the corresponding dynamic pressure sensor when the gas pressure data of other dynamic pressure sensors is less than A +/-5%, and decreasing the sensitivity of the corresponding dynamic pressure sensor when the gas pressure data of other dynamic pressure sensors is greater than A +/-5%.
In summary, due to the adoption of the technical scheme, compared with the prior art, the invention at least has the following beneficial effects:
the gas pressure value in each gas outlet channel is detected and displayed on the terminal by evenly distributing the gas and enabling the gas to enter the corresponding dynamic pressure sensor through the gas outlet channel. If the pressure values are consistent, the pressure measurement consistency of the dynamic pressure sensor is better; if the pressure values are not consistent, parameters (sensitivity) of the dynamic pressure sensor can be adjusted through the terminal, so that the pressure values measured by the dynamic pressure sensor are consistent, and the consistency of the transient impact pressure measurement of gas-solid two-phase flow in the coal and gas outburst process is improved.
Description of the drawings:
fig. 1 is a schematic structural diagram of a calibration system of a coal and gas outburst dynamic pressure sensor according to an exemplary embodiment of the invention.
Fig. 2 is a schematic structural view of a gas flow distribution device according to an exemplary embodiment of the present invention.
Fig. 3 is a cross-sectional view of a gas flow-splitting device according to an exemplary embodiment of the present invention.
Fig. 4 is a vertical cross-sectional view of a gas flow-splitting device according to an exemplary embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, the present invention provides a calibration system for coal and gas outburst dynamic pressure sensors, which includes a gas generating device 10, a gas splitting device 20, N dynamic pressure sensors 30 and a terminal 40.
In this embodiment, the output end of the gas generating device 10 is connected to the input end of the gas flow dividing device 20, the output end of the gas flow dividing device 20 is connected to the input end of the dynamic pressure sensor 30, and the output end of the dynamic pressure sensor 30 is connected to the terminal 40. The gas generating device 10 generates gas to enter the gas splitting device 20 for gas splitting, the gas enters the corresponding dynamic pressure sensor 30 from different gas outlet channels for pressure measurement, and the pressure value is displayed on the terminal 40. The gas generating apparatus 10 and the dynamic pressure sensor 30 are conventional, and the terminal 40 may be a computer or the like.
Fig. 2 is a cross-sectional view of an exemplary gas flow distribution device 20 of the present embodiment, and fig. 3 is a cross-sectional view of the exemplary gas flow distribution device 20 of the present embodiment. The gas flow divider 20 comprises a body, which may be a cylinder, with a diameter of 150mm and a height of 40 mm; the central position of the upper surface of the main body is provided with an air inlet hole 201, the diameter can be 28mm, the depth is 25mm, and the air inlet hole 201 is connected with the gas generating device 10 through a sealing structure; the side surface of the main body is evenly distributed with N air outlet holes 203, for example, N is 8, then 8 air outlet holes 203 are evenly distributed on the side surface of 360 degrees, namely, the angle between every two air outlet holes 203 is 45 degrees, the air outlet holes 203 are circular, and the diameter of the air outlet holes 203 can be 10 mm. The air outlet 203 is connected with the air inlet 201 through an air outlet channel 202, and the interior of the air outlet channel 202 is of a threaded structure, so that the dynamic pressure sensor 30 can be conveniently installed; n air outlet channel 202 is circular passageway, and the diameter is the same with the diameter of venthole 203 and N air outlet channel 202's centre of a circle is located same horizontal plane, can guarantee like this that gas can not appear shunting inhomogeneous because of air outlet channel 202's difference in height to the uniformity of the gas pressure of flowing out in every air outlet channel 202 has been ensured.
Fig. 3 is a vertical cross-sectional view of the exemplary gas flow distribution device 20 of this embodiment, a guide ball 204 is disposed at the inner center of the gas flow distribution device 20, and is a spherical convex structure, the radius of the guide ball 204 is 15mm, the height of the convex is 8mm, and the guide ball 204 is located right below the gas inlet hole 201, i.e., the center of the guide ball 204 is coaxial with the center of the gas inlet hole 201; namely, the N air outlet channels 202 are all connected with the guide ball 204. The guide ball 204 is used for evenly dividing the gas entering from the gas inlet hole 201, reducing the flow resistance and reducing the flow vortex, so as to ensure the pressure of the gas in each gas outlet channel 202 to be consistent, and facilitate the pressure detection of the dynamic pressure sensor 30.
In the coal and gas outburst simulation test field, pressure measurement is carried out through the N dynamic pressure sensors 30 to simulate pressure change, and firstly, the pressure values initially measured by the N dynamic pressure sensors 30 are ensured to be the same, so that pressure calculation and simulation can be carried out through the change of the values in the dynamic pressure sensors 30.
In this embodiment, the gas flow-dividing device 20 can equally divide the gas entering, that is, the pressure data of the gas measured by the N dynamic pressure sensors 30 are the same, which can be understood as that the pressure value is within the error range, and the error is 5% (common engineering requirements); in this embodiment, only the consistency of each of the N dynamic pressure sensors 30 needs to be ensured, so that the pressure data a measured by any one of the dynamic pressure sensors 30 can be used as a standard, the parameters of the other dynamic pressure sensors 30 are adjusted, and repeated measurement is performed to ensure that the measured pressure data is within a range of a ± 5%, which can indicate that the consistency of the N dynamic pressure sensors 30 is good, and can be applied to a coal and gas outburst simulation test field. For example, decreasing/increasing the slope (sensitivity) of the output-input characteristic, the measured pressure data may be decreased/increased.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (7)
1. A calibration system of a coal and gas outburst dynamic pressure sensor comprises a gas generating device and a terminal, and is characterized by further comprising a gas distributing device and N dynamic pressure sensors, wherein N is more than or equal to 2 and is a positive integer;
the input end of the gas shunting device is connected with the output end of the gas generating device, the output end of the gas shunting device is respectively connected with the input ends of the N dynamic pressure sensors, and the output ends of the dynamic pressure sensors are connected with the terminal.
2. The system for calibrating the dynamic pressure sensor for coal and gas outburst according to claim 1, wherein the gas distribution device comprises a cylindrical main body, an air inlet hole (201) is formed in the center of the upper surface of the cylindrical main body, N air outlet holes (203) are evenly distributed in the side surface of the cylindrical main body, and the N air outlet holes (203) are connected with the air inlet hole (201) through N air outlet channels (202).
3. The system for calibrating the dynamic pressure sensor for coal and gas outburst as claimed in claim 1, wherein the gas outlet channel (202) is circular and has a threaded structure inside.
4. The system for calibrating the dynamic pressure sensor for coal and gas outburst as claimed in claim 2, wherein a guide ball (204) is further arranged inside the main body of the gas flow dividing device, and the guide ball (204) is respectively connected with the N gas outlet channels (202).
5. The system for calibrating a coal and gas fired dynamic pressure sensor as claimed in claim 2, wherein said cylindrical body has a radius of 100 to 200mm and a height of 30 to 50 mm; the radius of the air inlet hole (201) is 25-30 mm, and the depth is 20-30 mm; the radius of the air outlet hole (203) is 4-6 mm.
6. A calibration method of a coal and gas outburst dynamic pressure sensor is characterized by comprising the following steps:
s1: the gas generating device inputs gas into the gas shunting device for gas shunting, the N dynamic pressure sensors respectively measure the gas pressure at each gas outlet in the gas shunting device, and the terminal receives and analyzes the gas pressure data;
s2: and when the gas pressure data are not the same, adjusting the parameters of the dynamic pressure sensors, and repeating the step S1 until the gas pressure data measured by the N dynamic pressure sensors are the same.
7. The method for calibrating a coal and gas outburst dynamic pressure sensor as claimed in claim 6, wherein in step S2, the method for adjusting parameters of the dynamic pressure sensor comprises:
the method comprises the steps of taking gas pressure data A measured by any one of N dynamic pressure sensors as a standard, increasing the sensitivity of the corresponding dynamic pressure sensor when the gas pressure data of other dynamic pressure sensors is less than A +/-5%, and decreasing the sensitivity of the corresponding dynamic pressure sensor when the gas pressure data of other dynamic pressure sensors is greater than A +/-5%.
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| CN201910929755.2A CN110617915B (en) | 2019-09-29 | 2019-09-29 | Calibration system and method for coal and gas outburst dynamic pressure sensor |
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| CN201910929755.2A CN110617915B (en) | 2019-09-29 | 2019-09-29 | Calibration system and method for coal and gas outburst dynamic pressure sensor |
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