Gas parameter measuring device

Abstract

The invention discloses a gas parameter measuring device. The device comprises a gas concentration collector, a gas flow collector, a pressure and temperature collector and a main control unit, the gas concentration collector is used for collecting gas concentration information of gas in the gas extraction pipeline and sending the gas concentration information to the main control unit; the gas flow collector is used for collecting gas flow information of gas in the gas extraction pipeline and sending the gas flow information to the main control unit; the pressure and temperature collector is used for collecting temperature information and air pressure information in the gas extraction pipeline and sending the temperature information and the air pressure information to the main control unit; and the main control unit is used for correcting the gas flow information based on the temperature information and the gas pressure information to obtain corrected flow information, and wirelessly sending the corrected flow information, the gas concentration information, the temperature information and the gas pressure information to an upper computer. According to the device, the measurement efficiency of the gas parameters in the gas extraction pipeline can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine safety monitoring, and in particular to a gas parameter measuring device. Background Art

[0002] During coal mining, methane is a naturally occurring combustible gas that accompanies coal seams and is typically found in the pores and fissures of coal rock. As coal mining operations progress, gas extraction pipelines, such as pipelines, gas extraction mains, trunk pipes, branch pipes, drilling sites, and boreholes, are required to transport the methane from the coal mines to ensure efficient gas removal. Therefore, it is necessary to measure gas parameters such as concentration and flow rate in gas extraction pipelines to monitor gas removal efficiency and ensure safety during the coal mining process.

[0003] Currently, measuring the gas parameters of gas extraction pipelines often requires workers to carry handheld gas detectors and conduct manual inspections of the pipelines to measure and record the concentration and flow parameters of the gas in the pipelines. However, manual inspections require manual measurement and recording of gas parameters, which cannot achieve dynamic gas parameter measurement, resulting in low gas parameter measurement efficiency within the pipelines. Summary of the Invention

[0004] In view of this, the present application provides a gas parameter measuring device, the main purpose of which is to solve the technical problem of low efficiency in measuring gas parameters in a gas extraction pipeline.

[0005] According to a first aspect of the present invention, there is provided a gas parameter measuring device for detecting gas parameters in a gas extraction pipeline, the device comprising a main control unit, a gas flow collector, a pressure and temperature collector, and a gas concentration collector;

[0006] The gas concentration collector is used to collect gas concentration information of the gas in the gas extraction pipeline and send the gas concentration information to the main control unit;

[0007] The gas flow collector is used to collect gas flow information of the gas in the gas extraction pipeline and send the gas flow information to the main control unit;

[0008] The pressure and temperature collector is used to collect temperature information and air pressure information in the gas extraction pipeline, and send the temperature information and the air pressure information to the main control unit;

[0009] The main control unit is used to correct the gas flow information based on the temperature information and the air pressure information to obtain corrected flow information, and wirelessly send the corrected flow information, the gas concentration information, the temperature information and the air pressure information to a remote host computer.

[0010] In an optional embodiment, the gas concentration collector includes a laser sending unit, a laser receiving unit, an ambient air pressure collecting unit and a first control unit, wherein the laser sending unit and the laser receiving unit are arranged in the gas extraction pipeline, and the laser sending unit is separated from the laser receiving unit by a first preset distance value; the laser sending unit is used to transmit a laser beam with a preset light intensity value to the laser receiving unit; the laser receiving unit is used to receive the laser beam, determine the laser receiving light intensity value of the received laser beam, and send the laser receiving light intensity value to the first control unit; the ambient air pressure collecting unit is used to collect the ambient air pressure value at the gas extraction pipeline, and send the ambient air pressure value to the first control unit; the first control unit is used to determine the gas concentration information of the gas in the gas extraction pipeline based on the preset absorption coefficient, the first preset distance value, the preset light intensity value, the laser receiving light intensity value and the ambient air pressure value, and send the gas concentration information to the main control unit.

[0011] In an optional embodiment, the gas flow collector includes a first sound transceiver unit, a second sound transceiver unit and a second control unit; wherein, the first sound transceiver unit and the second sound transceiver unit are arranged in the gas extraction pipeline, the first sound transceiver unit and the second sound transceiver unit are separated by a second preset distance value, and the angle between the straight line between the first sound transceiver unit and the second sound transceiver unit and the center line of the gas extraction pipeline is a preset angle value; the second control unit is configured to perform the following processing: the second control unit controls the first sound transceiver unit to emit a first sound signal, and records the first sound time when the first sound transceiver unit emits the first sound signal; determines the The second sound transceiver unit receives the second sound time of the first sound signal, and calculates the first time difference between the second sound time and the first sound time; controls the second sound transceiver unit to send out a second sound signal, and records the third sound time when the second sound transceiver unit sends out the second sound signal; determines the fourth sound time when the first sound transceiver unit receives the second sound signal, and calculates the second time difference between the fourth sound time and the third sound time; determines the gas flow rate information based on the first time difference, the second time difference, the second preset distance value and the preset angle value, and determines the gas flow rate information based on the gas flow rate information and the cross-sectional area of ​​the gas extraction pipeline.

[0012] In an optional embodiment, the main control unit corrects the gas flow information based on the temperature information and the air pressure information to obtain corrected flow information, including: obtaining a preset standard pressure value and a standard temperature value, and correcting the gas flow information based on the standard pressure value, the standard temperature value, the temperature information and the air pressure information to obtain corrected flow information.

[0013] In an optional embodiment, the operating mode of the gas parameter measuring device includes a low-power operating mode; when the gas parameter measuring device is in the low-power operating mode, the gas parameter measuring device has a preset time length as a working cycle, and during the working cycle, the gas parameter measuring device is in a dormant state for a first time length and in an operating state for a second time length.

[0014] In an optional embodiment, the gas parameter measuring device further includes a positioning unit; the positioning unit is used to determine the location information of the gas parameter measuring device and send the location information to the main control unit, so that the main control unit sends the location information to the host computer.

[0015] In an optional embodiment, the gas parameter measuring device also includes an audible and visual alarm; the main control unit is also used to compare the gas concentration information with a preset concentration threshold, and when the gas concentration information is greater than or equal to the concentration threshold, control the audible and visual alarm to emit audible and visual alarm information, and send the alarm information to the host computer.

[0016] In an optional embodiment, the gas parameter measuring device further includes a power supply unit, wherein the power supply unit includes an energy storage unit, a power switching circuit and a power management unit; the power switching circuit is connected to the energy storage unit and the external power supply, respectively, for obtaining working power from the energy storage unit or the external power supply, and powering the gas parameter measuring device based on the working power; when the power switching circuit obtains working power from the energy storage unit, the power management unit is used to monitor the remaining power of the energy storage unit, and when the remaining power is lower than a preset power threshold, sends a low power indication signal to the main control unit; the main control unit is also used to control the operating mode of the gas parameter measuring device to be in the low power consumption operating mode in response to the low power indication signal.

[0017] In an optional embodiment, the energy storage unit includes a photovoltaic panel and a supercapacitor; the photovoltaic panel is connected to the supercapacitor for receiving light and charging the supercapacitor; the supercapacitor is connected to the power switching circuit for delivering the working power to the power switching circuit.

[0018] In an optional embodiment, the gas parameter measuring device also includes a human-computer interaction device, which is connected to the main control unit and is used to receive the corrected flow information, the gas concentration information, the temperature information and the air pressure information, and display the corrected flow information, the gas concentration information, the temperature information and the air pressure information.

[0019] The present invention provides a gas parameter measuring device that can collect flow information, temperature information, gas pressure information, and gas concentration information of the gas in the gas extraction pipeline through a gas flow collector, a pressure and temperature collector, and a gas concentration collector, and wirelessly transmit the gas concentration information, flow information, temperature information, and gas pressure information to a main control unit through wireless communication. Furthermore, the main control unit can obtain the above information and correct the gas flow information based on the temperature information and gas pressure information to obtain the corrected gas flow information; further, the main control unit wirelessly transmits the gas concentration information, temperature information, gas pressure information, and corrected gas flow information to a remote host computer, completing the measurement of the gas parameters in the gas extraction pipeline, so that relevant staff can detect the parameters of the gas in the gas extraction pipeline at the host computer. The technical solution provided in this application can measure the gas parameters in the gas extraction pipeline in real time based on the gas parameter measuring device, thereby improving the measurement efficiency of the gas parameters; at the same time, the main control unit can wirelessly send the collected gas parameters to the remote host computer, and realize the wiring-free installation and deployment between the measuring device and the host computer, reducing the wiring complexity in the coal mine and improving the maintenance convenience of the measuring device.

[0020] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 A schematic structural diagram of a gas parameter measuring device provided by an embodiment of the present invention is shown;

[0023] Figure 2 A schematic structural diagram of a gas concentration collector provided by an embodiment of the present invention is shown;

[0024] Figure 3 A schematic structural diagram of a gas flow collector provided by an embodiment of the present invention is shown;

[0025] Figure 4 A schematic structural diagram of another gas parameter measuring device provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0027] Currently, measuring the gas parameters of gas extraction pipelines often requires workers to carry handheld gas detectors and conduct manual inspections of the pipelines to measure and record the concentration and flow parameters of the gas in the pipelines. However, manual inspections require manual measurement and recording of gas parameters, which cannot achieve dynamic gas parameter measurement, resulting in low gas parameter measurement efficiency within the pipelines.

[0028] In order to solve the above problems, in one embodiment, Figure 1 As shown, a gas parameter measuring device is provided. The device is used to measure the parameters of gas in a gas extraction pipeline 10 as an example for description. The gas parameter measuring device includes a gas flow collector 200, a pressure and temperature collector 300, a main control unit 400, and at least one gas concentration collector 100. The main control unit 400 can be a computer device such as a single-chip microcomputer or a digital signal processor. For example, the main control unit 400 can be an STM32F407 chip with an integrated RS485 / CAN bus interface.

[0029] Specifically, the gas concentration collector 100 is used to collect gas concentration information of the gas in the gas extraction pipeline 10 and send the gas concentration information to the main control unit 400; wherein, the gas concentration collector 100 can be used to collect gas concentration information of the gas in the gas extraction pipeline 10 and send the gas concentration information to the main control unit 400; 2 C bus or other bus connection forms to establish a communication connection with the main control unit 400.

[0030] Furthermore, the gas extraction pipeline 10 in the coal mine may include a methane gas extraction pipeline for transporting methane gas and a carbon monoxide gas extraction pipeline for transporting carbon monoxide. Based on this, the number of gas concentration collectors 100 in the gas parameter measuring device can be two, which are respectively arranged at the methane gas extraction pipeline and the carbon monoxide gas extraction pipeline to respectively collect the gas concentration information of methane gas in the methane gas extraction pipeline and the gas concentration information of carbon monoxide gas in the carbon monoxide gas extraction pipeline, and send the gas concentration information of methane gas and the gas concentration information of carbon monoxide gas to the main control unit 400.

[0031] Furthermore, the gas flow collector 200 is used to collect gas flow information of the gas in the gas extraction pipeline 10 and wirelessly send the gas flow information to the main control unit 400; wherein, the gas flow collector 200 can be used to collect gas flow information of the gas in the gas extraction pipeline 10 and wirelessly send the gas flow information to the main control unit 400;2 C bus or other bus forms to establish a communication connection with the main control unit 400.

[0032] Here, the number of gas flow collectors 200 in the gas parameter measuring device can also be two, which are respectively arranged at the methane gas extraction pipeline and the carbon monoxide gas extraction pipeline to respectively collect the gas flow information of methane gas in the methane gas extraction pipeline and the gas flow information of carbon monoxide gas in the carbon monoxide gas extraction pipeline, and send the gas flow information of methane gas and the gas flow information of carbon monoxide gas to the main control unit 400.

[0033] Furthermore, the pressure and temperature collector 300 is used to collect temperature information and air pressure information in the gas extraction pipeline 10, and wirelessly transmit the temperature information and air pressure information to the main control unit 400; Here, the pressure and temperature collector 300 may include a pressure sensor and a temperature sensor, which are arranged in the gas extraction pipeline 10 to collect air pressure information in the gas extraction pipeline 10 through the pressure sensor and collect temperature information in the gas extraction pipeline 10 through the temperature sensor. Here, the pressure and temperature collector 300 may be I 2 A communication connection is established between the main control unit 400 via a C bus or other bus forms to send the air pressure information and temperature information to the main control unit 400.

[0034] Here, the number of pressure and temperature collectors 300 in the gas parameter measuring device can also be two, which are respectively arranged at the methane gas extraction pipeline and the carbon monoxide gas extraction pipeline to respectively collect the gas pressure information and temperature information of the methane gas in the methane gas extraction pipeline, and the gas pressure information and temperature information of the carbon monoxide gas in the carbon monoxide gas extraction pipeline, and send the above-mentioned gas pressure information and temperature information to the main control unit 400.

[0035] Furthermore, the gas flow collector 200, pressure and temperature collector 300 and gas concentration collector 100 arranged at the methane gas extraction pipeline can be preset with the same first sensor identifier. When the gas flow collector 200 sends gas flow information to the main control unit 400, it can send the first sensor identifier together with the gas flow information to the main control unit 400; when the pressure and temperature collector 300 sends temperature information and air pressure information to the main control unit 400, it can send the first sensor identifier together with the temperature information and air pressure information to the main control unit 400; when the gas concentration collector 100 sends gas concentration information to the main control unit 400, it can send the first sensor identifier together with the gas concentration information to the main control unit 400, so that the main control unit 400 can determine that the received gas flow information, gas concentration information, temperature information and air pressure information are gas parameters in the methane gas extraction pipeline, and perform subsequent processing.

[0036] Similarly, the gas flow collector 200, pressure and temperature collector 300 and gas concentration collector 100 arranged at the carbon monoxide gas extraction pipeline can be preset with the same second sensor identifier. When the gas flow collector 200 sends gas flow information to the main control unit 400, it can send the second sensor identifier together with the gas flow information to the main control unit 400; when the pressure and temperature collector 300 sends temperature information and air pressure information to the main control unit 400, it can send the second sensor identifier together with the temperature information and air pressure information to the main control unit 400; when the gas concentration collector 100 sends gas concentration information to the main control unit 400, it can send the second sensor identifier together with the gas concentration information to the main control unit 400, so that the main control unit 400 can determine that the received gas flow information, gas concentration information, temperature information and air pressure information are gas parameters in the carbon monoxide gas extraction pipeline, and perform subsequent processing.

[0037] Furthermore, the main control unit 400 is used to correct the gas flow information based on the temperature information and the air pressure information to obtain the corrected flow information, and wirelessly transmit the corrected flow information, the gas concentration information, the temperature information, and the air pressure information to a remote host computer (not shown in the figure). Here, the main control unit 400 may be provided with a wireless communication device such as a LoRaWAN wireless module, so that the main control unit 400 and the host computer can exchange wireless data through LoRaWAN wireless communication. Among them, the operating frequency band of the LoRaWAN wireless module is 433MHz, the transmission power is 20dBm, and it supports Mesh self-organizing networks.

[0038] In actual operation, the gas parameter measuring device can be fixed to the surface of the gas extraction pipeline 10 via a magnetic flange. After the main control unit 400 is turned on, the main control unit 400 automatically scans the surrounding LoRaWAN base stations through the LoRaWAN wireless module to join the Mesh network, establish a communication connection with the host computer in the same Mesh network, and report the device identification and location information of the gas parameter measuring device to the host computer. Furthermore, the main control unit 400 receives gas concentration information, gas flow information, temperature information, and air pressure information, and corrects the gas flow information based on the temperature information and air pressure information to obtain corrected flow information, and wirelessly sends the corrected flow information, gas concentration information, temperature information, and air pressure information to the host computer used by relevant staff to complete the gas parameter measurement work. In addition, the main control unit 400 can encrypt the corrected flow information, gas concentration information, temperature information and air pressure information, and package the corrected flow information, gas concentration information, temperature information and air pressure information once every 10 seconds (including CRC check code), and encrypt the packaged data using the AES-128 algorithm and transmit it to the host computer.

[0039] The gas parameter measuring device provided in this embodiment can measure the gas parameters in the gas extraction pipeline in real time through the gas parameter measuring device, thereby improving the efficiency of gas parameter measurement; in addition, the main control unit can also wirelessly send the collected gas parameters to a remote host computer, thereby realizing wiring-free installation and deployment between the measuring device and the host computer, reducing the wiring complexity in the coal mine and improving the maintenance convenience of the measuring device.

[0040] In an optional embodiment, if Figure 2 As shown, the gas concentration collector includes a laser transmitting unit 110, a laser receiving unit 120, an ambient air pressure collecting unit 130, and a first control unit 140. The first control unit 140 can be a computer device such as a single chip microcomputer or a digital signal processor.

[0041] Specifically, the laser transmitting unit 110 is configured to, under the control of the first control unit 140, emit a laser beam having a preset intensity value toward the laser receiving unit 120. The laser transmitting unit 110 and the laser receiving unit 120 are disposed within the gas extraction pipeline 10, with a first preset distance L between the laser transmitting unit 110 and the laser receiving unit 120. The laser transmitting unit 110 and the laser receiving unit 120 are disposed relative to each other within the gas extraction pipeline 10, such that the laser beam emitted by the laser transmitting unit 110 can be received by the laser receiving unit 120 as it passes through the gas within the pipeline. Furthermore, the laser beam emitted by the laser transmitting unit 110 is a modulated laser beam having a wavelength of 1653 nm. The laser receiving unit 120 can be controlled to emit a laser beam having a preset intensity value, which can be determined based on actual conditions. The preset intensity value of the laser beam emitted by the laser transmitting unit 110 can be represented by a preset intensity value of a harmonic signal of the laser beam.

[0042] Here, according to the Lambert-Beer principle, when a laser beam passes through the gas being detected, the interaction between photons and gas molecules causes the signal modulation form of the laser beam to deform, thereby affecting the intensity of the laser beam. Here, the laser beam emitted by the laser transmitting unit 110 interacts with the gas molecules, causing the signal modulation form of the laser beam to deform, thereby changing the intensity of the laser beam received by the laser receiving unit 120. Based on this, the gas concentration in the gas extraction pipeline 10 can be determined based on the intensity of the laser beam received by the laser receiving unit 120 and the intensity of the laser beam emitted by the laser transmitting unit 110. Here, methane gas molecules are used for illustration purposes, but other types of gases are also applicable to this embodiment.

[0043] Furthermore, the laser receiving unit 120 is configured to receive the laser beam, determine a laser receiving light intensity value of the received laser beam, and send the laser receiving light intensity value to the first control unit 140. Specifically, the laser receiving unit 120 may receive the laser beam emitted by the laser transmitting unit 110, determine the light intensity value of the laser beam, determine the light intensity value of the received laser beam as the laser receiving light intensity value, and send the laser receiving light intensity value to the first control unit 140. Here, the laser receiving unit 120 may calculate the intensity value of the harmonic signal in the received laser beam and determine the intensity value as the laser receiving light intensity value.

[0044] Furthermore, the ambient pressure collection unit 130 is configured to collect the ambient pressure value at the gas extraction pipeline 10 and transmit the ambient pressure value to the first control unit 140. The ambient pressure collection unit 130 may be disposed on the outer surface of the gas extraction pipeline 10 to collect the ambient pressure value at the outer surface.

[0045] Furthermore, the first control unit 140 is configured to determine the gas concentration information of the gas in the gas extraction pipeline 10 based on the preset absorption coefficient, the first preset distance value, the preset light intensity value, the laser received light intensity value, and the ambient pressure value, and send the gas concentration information to the main control unit 400. Specifically, the first control unit 140 can obtain the absorption coefficient, the preset distance value, and the preset light intensity value preset in the first control unit 140, and determine the gas concentration information of the gas in the gas extraction pipeline 10 together with the received laser received light intensity value and the ambient pressure value. Here, the first control unit 140 can calculate the gas concentration information of the gas in the gas extraction pipeline 10 based on Formula 1:

[0046]

[0047] Where C is the gas concentration value, i.e., gas concentration information, α(λ, T) is the preset absorption coefficient, P is the ambient pressure value, L is the first preset distance value, I0 is the preset light intensity value, and I is the laser received light intensity value. The technical solution provided by this application can measure gas concentration information in pipelines using laser gas detection technology based on the Lambert-Beer principle, ensuring that the measurement results are not affected by impurities such as water and dust in the pipeline, thereby improving the measurement accuracy of gas concentration.

[0048] In an optional embodiment, if Figure 3 As shown, the gas flow collector includes a first sound transceiver unit 210, a second sound transceiver unit 220, and a second control unit 230. The second control unit 230 can be a computer device such as a single-chip microcomputer or a digital signal processor. The first and second sound transceiver units 210 and 220 can be controlled to emit sound signals and receive sound signals from the environment. Here, the sound signals can be ultrasonic signals of a specific frequency and wavelength.

[0049] Specifically, the first sound transceiver unit 210 and the second sound transceiver unit 220 are arranged in the gas extraction pipeline 10, and the first sound transceiver unit 210 and the second sound transceiver unit 220 are separated by a second preset distance value S, and the angle between the straight line between the first sound transceiver unit 210 and the second sound transceiver unit 220 and the center line 11 of the gas extraction pipeline 10 is a preset angle value θ; wherein the preset angle value θ can be 45°; further, in the direction of gas flow in the gas extraction pipeline 10, the first sound transceiver unit 210 can be arranged in front of the second sound transceiver unit 220, so that the gas flows through the second sound transceiver unit 220 after flowing through the sound transceiver unit 210.

[0050] Furthermore, the second control unit 230 is configured to perform the following processing: first, the second control unit 230 controls the first sound transceiver unit 210 to emit a first sound signal, and records the first sound time when the first sound transceiver unit 210 emits the first sound signal.

[0051] Then, the second control unit 230 determines the second sound time when the second sound transceiver unit 220 receives the first sound signal, and calculates the first time difference between the second sound time and the first sound time. Here, when the second sound transceiver unit 220 receives the first sound signal, it sends a first response signal to the second control unit 230, and the second control unit 230 determines the time when the first response signal is received as the second sound time. Further, the second control unit 230 calculates the time interval between the second sound time and the first sound time, and determines the calculated time interval as the first time difference.

[0052] Furthermore, the second control unit 230 controls the second sound transceiver unit 220 to send out a second sound signal, and records a third sound time when the second sound transceiver unit 220 sends out the second sound signal.

[0053] Then, the second control unit 230 determines the fourth sound time when the first sound transceiver unit 210 receives the second sound signal, and calculates the second time difference between the fourth sound time and the third sound time. Here, when the first sound transceiver unit 210 receives the second sound signal, it sends a second response signal to the second control unit 230, and the second control unit 230 determines the time when the second response signal is received as the fourth sound time. Further, the second control unit 230 calculates the time interval between the fourth sound time and the third sound time, and determines the calculated time interval as the second time difference.

[0054] Finally, the second control unit 230 determines the gas flow rate information based on the first time difference, the second time difference, the second preset distance value S, and the preset angle value θ, and determines the gas flow rate information based on the gas flow rate information and the cross-sectional area of ​​the gas extraction pipeline 10. The cross-sectional area of ​​the gas extraction pipeline 10 can be preset in the second control unit 230. Here, when the ultrasonic signal propagates in the flowing gas, the propagation velocity is superimposed on the gas flow velocity. When the ultrasonic signal propagates along the gas flow direction, the propagation direction is the same as the gas flow velocity component, and the sound velocity is superimposed on the gas velocity component, increasing the propagation velocity and shortening the propagation time. When the ultrasonic signal propagates against the gas flow direction, the propagation direction is opposite to the gas flow velocity component, and the sound velocity is superimposed on the negative value of the gas velocity component, reducing the propagation velocity and lengthening the propagation time.

[0055] Specifically, when the first sound transceiver unit 210 transmits a sound wave to the second sound transceiver unit 220, the propagation direction of the sound wave is the same as the flow direction of the air in the pipeline. The time it takes for the sound wave to reach the second sound transceiver unit 220 is expressed as follows:

[0056]

[0057] Among them, t s is the first time difference, S is the second preset distance value, θ is the preset angle value, and V is the gas flow rate value, that is, the gas flow rate information.

[0058] In contrast, when the second sound transceiver unit 220 transmits sound waves to the first sound transceiver unit 210, the propagation direction of the sound waves is opposite to the direction of the air flow in the pipeline. The time it takes for the sound waves to reach the first sound transceiver unit 210 is shown in Formula 3:

[0059]

[0060] Among them, t n is the second time difference, S is the second preset distance value, θ is the preset angle value, and V is the gas flow rate value, that is, the gas flow rate information. Further, according to Formula 2 and Formula 3, the calculation formula of the gas flow rate information can be obtained, and the calculation formula of the gas flow rate information is shown in Formula 4:

[0061]

[0062] Among them, t s is the first time difference, t n is the second time difference, S is the second preset distance value, θ is the preset angle value, and V is the gas flow rate value, that is, the gas flow rate information. Further, the gas flow information can be calculated according to Formula 5:

[0063] Q=A·V (5)

[0064] Where Q is the gas flow information, i.e., the instantaneous flow rate of the gas in the pipeline, A is the cross-sectional area of ​​the gas extraction pipeline 10, and V is the gas flow velocity value. The cross-sectional area, the second preset distance value, and the preset angle value can be pre-stored in the second control unit 230. The embodiments provided herein can determine the flow velocity of the gas in the gas extraction pipeline based on the acoustic wave signal, and determine the gas flow rate in the gas extraction pipeline based on the gas flow velocity and the cross-sectional area of ​​the gas extraction pipeline, thereby improving the measurement accuracy of the gas flow by the gas parameter measurement device.

[0065] In an optional embodiment, the main control unit corrects the gas flow information based on the temperature information and the air pressure information to obtain the corrected flow information, including: obtaining a preset standard pressure value and a standard temperature value, and correcting the gas flow information based on the standard pressure value, the standard temperature value, the temperature information, and the air pressure information to obtain the corrected flow information. The standard pressure value and the standard temperature value may be pre-stored in the main control unit.

[0066] Furthermore, the corrected flow information can be obtained based on Formula 6:

[0067]

[0068] Among them, Q std is the corrected flow information, Q is the gas flow information, P act is the air pressure information, P std is the standard pressure value, T std is the standard temperature value, T act The corrected flow rate information obtained here can be used as the instantaneous pure flow rate of the gas in the pipeline. The embodiments provided in this application can correct the gas flow rate information based on the temperature information and pressure information in the pipeline to obtain the corrected flow rate information, thereby improving the calculation accuracy of the gas flow in the pipeline.

[0069] Furthermore, the gas parameter measuring device can also calculate the negative pressure of the gas extraction pipeline. Specifically, the pressure sensor arranged on the inner wall of the gas extraction pipeline can output pressure value data in the form of an analog signal based on the pressure value collected by it; then, the analog-to-digital converter can convert the pressure value data in the form of an analog signal into pressure value data in the form of a digital signal, so that the main control unit can determine the pressure value data as the negative pressure value of the gas extraction pipeline.

[0070] Furthermore, the main control unit can calculate the total amount of gas flowing through the gas extraction pipeline per unit time; specifically, the total amount can be calculated according to Formula 7:

[0071] Q 总 =∑Qstd ×Δt(7)

[0072] Among them, Q 总 is the total amount of information, Q std To correct the flow information, Δt is the length of time per unit time. Further, the main control unit can calculate the total amount information from 0:00 to 24:00 every day in the above manner, store the total amount information from 0:00 to 24:00 every day, or send it to a remote host computer.

[0073] Furthermore, the main control unit can calculate the conversion ratio of the volume of gas in the gas extraction pipeline under actual working conditions and standard conditions based on Formula 8:

[0074]

[0075] Among them, Pr is the conversion ratio, P act is the air pressure information, P std is the standard pressure value, T std is the standard temperature value, T act It is the temperature information.

[0076] In an optional embodiment, the operating mode of the gas parameter measuring device includes a low power consumption operating mode;

[0077] When the gas parameter measurement device is in the low-power operation mode, the gas parameter measurement device has a preset time length as a working cycle. During the working cycle, the gas parameter measurement device is in a dormant state for a first time length and in an operating state for a second time length. The preset time length may be one second, the first time length may be 0.6 seconds, and the second time length may be 0.4 seconds. Specifically, when the gas parameter measuring device is in the low-power operation mode, it can be in a sleep state during the first 0.6 seconds or the last 0.6 seconds of each second to save power; and it can be in an operating state during the remaining 0.4 seconds of each second, so that the gas concentration collector collects the gas concentration information of the gas in the gas extraction pipeline, the gas flow collector collects the gas flow information of the gas in the gas extraction pipeline, and the pressure and temperature collector collects the temperature information and air pressure information in the gas extraction pipeline. At the same time, the main control unit obtains the gas concentration information, gas flow information, temperature information and air pressure information, and corrects the gas flow information based on the temperature information and air pressure information to obtain the corrected flow information, and wirelessly sends the corrected flow information, gas concentration information, temperature information and air pressure information to the host computer to complete the gas parameter measurement work.

[0078] The technical solution provided in this application can put the gas parameter measurement device into a low-power operation mode, periodically being in a dormant state and a working state, so as to save energy consumption of the gas parameter measurement device and extend the working time of the gas parameter measurement device.

[0079] In an optional embodiment, the gas parameter measuring device further includes a positioning unit; wherein the positioning unit can be an ultra-wideband (Ultra Wide Band, UWB) positioning module. Here, the positioning unit can be connected to the main control unit via a UART interface or other wired connection form to realize positioning data interaction. Specifically, the positioning unit is used to determine the location information of the gas parameter measuring device, and send the location information to the main control unit, so that the main control unit sends the location information to the host computer. The embodiment provided in the present application can determine the geographical location information of the gas parameter measuring device based on the positioning unit, and send the geographical location information to the host computer, so as to facilitate the relevant staff to manage the gas parameter measuring device.

[0080] In an optional embodiment, if Figure 4 As shown, the gas parameter measuring device also includes an audible and visual alarm 500; wherein, the audible and visual alarm 500 can be a speaker and a flashlight. Furthermore, the main control unit 400 is also used to compare the gas concentration information with a preset concentration threshold value, and when the gas concentration information is greater than or equal to the concentration threshold value, control the audible and visual alarm 500 to emit audible and visual alarm information, and send an alarm message to the host computer (not shown in the figure). Here, the numerical value of the concentration threshold value can be determined according to actual conditions and pre-set in the main control unit 400. The embodiment provided in the present application can enable the gas parameter measuring device to have a concentration over-limit alarm function and an alarm point setting function, and to promptly issue an audible and visual alarm when the gas concentration information is too high, thereby enriching the function of the gas parameter measuring device.

[0081] In an optional embodiment, if Figure 4 As shown, the gas parameter measurement device further includes a power supply unit 600, wherein the power supply unit 600 includes an energy storage unit 610, a power switch circuit 620, and a power management unit 630. The energy storage unit 610 can be an 18V / 10Ah intrinsically safe lithium battery pack, and the power management unit 630 can be a computer device such as a single-chip microcomputer.

[0082] Specifically, the power switch circuit 620 is connected to the energy storage unit 610 and the external power source E, respectively, and is configured to obtain operating power from the energy storage unit 610 or the external power source E, and to power the gas parameter measurement device based on the operating power. The external power source E may be a mining intrinsically safe power supply capable of outputting a 127V voltage. The power switch circuit 620 can be controlled to draw operating power from the external power source E or from the energy storage unit 610. Furthermore, the power switch circuit 620 can also be connected to the main control unit 400, the power management unit 630, the gas flow collector 200, the pressure and temperature collector 300, and the gas concentration collector 100, supplying power to these components via the DC-DC converter circuit provided within the power switch circuit 620.

[0083] Furthermore, when the power switch circuit 620 obtains operating power from the energy storage unit 610, the power management unit 630 is configured to monitor the remaining power of the energy storage unit 610 and, when the remaining power falls below a preset power threshold, send a low-power indication signal to the main control unit 410; the preset power threshold may be 20% of the maximum storage power of the energy storage unit 610. Specifically, when the power switch circuit 620 receives operating power from the energy storage unit 610 to power the gas parameter measurement device, the power management unit 630 monitors the remaining power of the energy storage unit 610 and, when the remaining power falls below the preset power threshold, sends a low-power indication signal to the main control unit 410. Furthermore, the main control unit 400 is further configured to control the gas parameter measurement device to operate in the low-power mode in response to the low-power indication signal.

[0084] Furthermore, the energy storage unit 610 includes a photovoltaic panel (not shown) and a supercapacitor (not shown). Specifically, the photovoltaic panel is connected to the supercapacitor, and the photovoltaic panel is used to receive light and charge the supercapacitor. The photovoltaic panel can receive light from an underground LED lamp and generate electricity to charge the supercapacitor. Furthermore, the supercapacitor is connected to the power switch circuit 620 to deliver the operating power to the power switch circuit 620.

[0085] Furthermore, the power management unit 630 can also perform dynamic power consumption management. When the power switch circuit 620 receives working power from the energy storage unit 610 to power the gas parameter measurement device and detects that the remaining power of the energy storage unit 610 is lower than the preset power threshold, the power management unit 630 uses one second as a working cycle, and controls the power switch circuit 620 to obtain working power from the energy storage unit 610 to power the gas parameter measurement device within the first 0.4 seconds of the working cycle, and controls the power switch circuit 620 to reduce the current received from the energy storage unit 610 within the last 0.6 seconds of the working cycle, so that the current value of the current received by the power switch circuit 620 from the energy storage unit 610 is less than or equal to 10 microamperes, so that the gas parameter measurement device is in a dormant standby state. The embodiment provided by the present application can enable the gas parameter measurement device to have a power supply control function, and can enter a low power consumption mode when the power of the energy storage unit is too low, thereby improving the operating time of the gas parameter measurement device.

[0086] In an optional embodiment, if Figure 4 As shown, the gas parameter measuring device also includes a human-computer interaction device 700, which is connected to the main control unit 400 and is used to receive the corrected flow information, the gas concentration information, the temperature information and the air pressure information, and display the corrected flow information, the gas concentration information, the temperature information and the air pressure information.

[0087] The human-computer interaction device 700 may include a display and a keyboard. A person may input information into the gas parameter measurement device via the keyboard to control the device. The gas parameter measurement device may also display the measured gas parameters on the display. The embodiments provided herein enable a person to view the parameters collected by the gas parameter measurement device and operate the gas parameter measurement device using the human-computer interaction device, thereby improving the ease of use of the gas parameter measurement device.

[0088] The gas parameter measuring device provided in this application can avoid wiring between the gas parameter measuring device and the host computer, reduce the wiring complexity in the mine, and accurately collect gas parameters such as gas flow, gas concentration, gas pressure and gas temperature in the pipeline. It can also support wireless transmission and low-power operation to adapt to the complex working environment underground.

[0089] The serial numbers of the above application are for descriptive purposes only and do not represent the advantages or disadvantages of the implementation scenarios. The above disclosure only discloses several specific implementation scenarios of the present application, but the present application is not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present application.

Claims

1. A gas parameter measuring device for detecting gas parameters in a gas extraction pipeline, characterized in that: The device includes a main control unit, a gas flow collector, a pressure and temperature collector, and a gas concentration collector; The gas concentration collector is used to collect gas concentration information of the gas in the gas extraction pipeline and send the gas concentration information to the main control unit; The gas flow collector is used to collect gas flow information of the gas in the gas extraction pipeline and send the gas flow information to the main control unit; The pressure and temperature collector is used to collect temperature information and air pressure information in the gas extraction pipeline, and send the temperature information and the air pressure information to the main control unit; The main control unit is used to correct the gas flow information based on the temperature information and the air pressure information to obtain corrected flow information, and wirelessly send the corrected flow information, the gas concentration information, the temperature information and the air pressure information to a remote host computer.

2. The gas parameter measuring device according to claim 1, characterized in that: The gas concentration collector includes a laser sending unit, a laser receiving unit, an ambient air pressure collecting unit and a first control unit, wherein the laser sending unit and the laser receiving unit are arranged in the gas extraction pipeline, and the laser sending unit and the laser receiving unit are separated by a first preset distance value; The laser sending unit is used to transmit a laser beam with a preset light intensity value to the laser receiving unit; The laser receiving unit is used to receive the laser beam, determine a laser receiving light intensity value of the received laser beam, and send the laser receiving light intensity value to the first control unit; The ambient air pressure acquisition unit is used to acquire the ambient air pressure value at the gas extraction pipeline and send the ambient air pressure value to the first control unit; The first control unit is used to determine the gas concentration information of the gas in the gas extraction pipeline based on the preset absorption coefficient, the first preset distance value, the preset light intensity value, the laser received light intensity value and the ambient pressure value, and send the gas concentration information to the main control unit.

3. The gas parameter measuring device according to claim 1, characterized in that: The gas flow collector includes a first sound transceiver unit, a second sound transceiver unit, and a second control unit; wherein the first sound transceiver unit and the second sound transceiver unit are arranged in the gas extraction pipeline, the first sound transceiver unit and the second sound transceiver unit are separated by a second preset distance value, and the angle between the straight line between the first sound transceiver unit and the second sound transceiver unit and the center line of the gas extraction pipeline is a preset angle value; The second control unit is configured to perform the following processing: The second control unit controls the first sound transceiver unit to send a first sound signal, and records the first sound time when the first sound transceiver unit sends the first sound signal; determining a second sound time at which the second sound transceiver unit receives the first sound signal, and calculating a first time difference between the second sound time and the first sound time; controlling the second sound transceiver unit to emit a second sound signal, and recording a third sound time when the second sound transceiver unit emits the second sound signal; determining a fourth sound time at which the first sound transceiver unit receives the second sound signal, and calculating a second time difference between the fourth sound time and the third sound time; The gas flow rate information is determined based on the first time difference, the second time difference, the second preset distance value, and the preset angle value, and the gas flow rate information is determined based on the gas flow rate information and the cross-sectional area of ​​the gas extraction pipeline.

4. The gas parameter measuring device according to claim 1, characterized in that: The main control unit corrects the gas flow information based on the temperature information and the gas pressure information to obtain corrected flow information, including: A preset standard pressure value and a standard temperature value are obtained, and the gas flow information is corrected based on the standard pressure value, the standard temperature value, the temperature information, and the air pressure information to obtain corrected flow information.

5. The gas parameter measuring device according to claim 1, characterized in that: The operating mode of the gas parameter measuring device includes a low power consumption operating mode; When the gas parameter measurement device is in the low power consumption operation mode, the gas parameter measurement device takes a preset time length as a working cycle. During the working cycle, the gas parameter measurement device is in a dormant state for a first time length and in an operating state for a second time length.

6. The gas parameter measuring device according to claim 1, characterized in that: The gas parameter measuring device further includes a positioning unit; The positioning unit is used to determine the position information of the gas parameter measuring device and send the position information to the main control unit, so that the main control unit sends the position information to the host computer.

7. The gas parameter measuring device according to claim 1, characterized in that: The gas parameter measuring device also includes an audible and visual alarm; The main control unit is further configured to compare the gas concentration information with a preset concentration threshold, and when the gas concentration information is greater than or equal to the concentration threshold, control the sound and light alarm to emit sound and light alarm information, and send the alarm information to the host computer.

8. The gas parameter measuring device according to claim 5, characterized in that: The gas parameter measuring device further comprises a power supply unit, wherein the power supply unit comprises an energy storage unit, a power switch circuit and a power management unit; The power switch circuit is connected to the energy storage unit and the external power supply respectively, and is used to obtain working power from the energy storage unit or the external power supply, and power the gas parameter measurement device based on the working power; When the power switch circuit obtains working power from the energy storage unit, the power management unit is used to monitor the remaining power of the energy storage unit and send a low power indication signal to the main control unit when the remaining power is lower than a preset power threshold; The main control unit is further configured to control the operation mode of the gas parameter measurement device to be in the low power consumption operation mode in response to the low power indication signal.

9. The gas parameter measuring device according to claim 8, characterized in that: The energy storage unit includes a photovoltaic panel and a supercapacitor; The photovoltaic panel is connected to the supercapacitor and is used to receive light and charge the supercapacitor; The supercapacitor is connected to the power switch circuit and is used to deliver the working power to the power switch circuit.

10. The gas parameter measuring device according to claim 1, characterized in that: The gas parameter measuring device also includes a human-computer interaction device, which is connected to the main control unit and is used to receive the corrected flow information, the gas concentration information, the temperature information and the air pressure information, and display the corrected flow information, the gas concentration information, the temperature information and the air pressure information.

Images