Collecting pipe comprehensive parameter tester

Abstract

The invention relates to a comprehensive parameter tester for a collecting pipe. The device comprises a gas detection assembly and a differential pressure detection assembly, wherein the gas detection assembly is composed of a Bluetooth main control chip, a gas pump, a gas extraction gas path, a gas exhaust gas path, a detection gas bin and a gas sensor group; the differential pressure detection assembly comprises an MCU chip, a first gas passage, a second gas passage and a differential pressure sensor, a first three-way electromagnetic valve is arranged on the first gas passage, a second three-way electromagnetic valve is arranged on the second gas passage, a third gas passage is further communicated between the first gas passage and the second gas passage, and a third three-way electromagnetic valve is arranged on the third gas passage. In addition to conventional methane concentration detection and gas flow rate detection functions, the device also has a gas passage backwashing function, and is used for blowing away liquid or solid particles blocked or adsorbed in a gas passage; the system also has a zero point recording function, and can deduct an error value generated by zero drift, so that the obtained data is more accurate.

Description

Technical Field

[0001] The present invention relates to a device, and in particular to a comprehensive parameter measuring instrument for a manifold. Background Art

[0002] The manifold is widely used in the gas extraction system, ventilation system and gas utilization system in coal mines. It is one of the important equipment for safe production in coal mines and efficient utilization of gas resources. The manifold can collect and process gas in a centralized manner, reducing the risk of gas accumulation in coal mines, thereby improving the safety of coal mine production. Monitoring the gas composition and parameters of each component in the pipeline is also one of the responsibilities of the safety regulator. Pipeline gas parameters mainly include gas concentration, gas pressure in the pipeline, gas flow in the pipeline, etc.

[0003] In order to facilitate the measurement of gas parameters in the manifold, multiple measuring holes are preset at different parts of the manifold, and a special detection tool is also provided: a manifold gas comprehensive parameter measuring instrument. Existing manifold gas comprehensive parameter measuring instruments generally have methane concentration detection function and gas flow rate detection function, among which the gas flow rate detection function is realized by using a pitot tube and a differential pressure sensor. The principle of the differential pressure sensor to detect gas flow rate is mainly based on Bernoulli's theorem and differential pressure measurement technology. However, in actual detection, since there may be various impurities such as liquid droplets, floating dust, and solid particles in the manifold, these impurities may enter or block the detection port of the pitot tube, which will cause the value detected by the differential pressure sensor to deviate from the actual value, or even fail to detect the data. At the same time, the differential pressure sensor itself will also have the phenomenon of zero drift, which is uncontrollable, but zero drift will also cause the detected value to be inaccurate and unable to reflect the actual working gas flow.

[0004] Existing manifold gas comprehensive parameter measuring instruments generally use a built-in air pump to extract the gas in the manifold to detect the methane concentration of the gas. However, the manifold is a negative pressure environment, which requires the air pump to have a certain power. Moreover, when the negative pressure in the manifold is too low, it is difficult to increase the air pump's air volume. Too low air volume will affect the accuracy of gas detection. Summary of the invention

[0005] The invention provides a comprehensive parameter measuring instrument for a manifold, which solves the problem in the prior art that impurities in the manifold gas block the pitot tube and the zero point drift of the differential pressure sensor itself, both of which lead to inaccurate gas flow rate detection values.

[0006] The above technical problems of the present invention are mainly solved by the following technical solutions: a manifold comprehensive parameter measuring instrument, including a gas detection component and a differential pressure detection component, the gas detection component is composed of a Bluetooth main control chip, an air pump, an air suction path, an exhaust path, a detection gas chamber and a gas sensor group, the air suction path is connected to the air suction port of the air pump, the exhaust path is connected to the exhaust port of the air pump, the air inlet end of the air suction path and the exhaust end of the exhaust path are both connected to the manifold, the detection gas chamber is connected to the air suction path, the gas sensor group is arranged on the detection gas chamber, the gas sensor group includes a CH4 sensor, a CO sensor, etc., the air pump and the gas sensor group are both controlled by the Bluetooth main control chip; the differential pressure detection The component includes an MCU chip, a first gas passage, a second gas passage and a differential pressure sensor. The two gas passages are respectively connected to the two detection ends on the differential pressure sensor. The collection end of the first gas passage faces the gas direction facing the manifold, and the collection end of the second gas passage faces the gas direction facing away from the manifold. A three-way solenoid valve 1 is provided on the first gas passage, and a three-way solenoid valve 2 is provided on the second gas passage. A third gas passage is also connected between the first gas passage and the second gas passage, and a three-way solenoid valve 3 is provided on the third gas passage. All three-way solenoid valves are controlled by the MCU chip, and the two connectors in the three-way solenoid valve are connected in series with the corresponding gas passages, and the third connectors of the three-way solenoid valves are all normal pressure connectors exposed to a normal pressure environment.

[0007] The detection principle of the gas detection component is: connect the suction gas path and the exhaust gas path to the detection port on the manifold, control the air pump to generate negative pressure through the Bluetooth main control chip, and the suction gas path extracts the gas in the manifold into the detection gas chamber. The gas sensor group can collect different gas data, and the Bluetooth main control chip can receive and store the collected data and transmit it through Bluetooth. The exhaust gas path is used to discharge the exhaust gas generated by the air pump back into the manifold. Through the above technical scheme, the present invention can ensure that the air pressure in the entire suction gas path, the exhaust gas path and the detection gas chamber is close to the air pressure in the manifold. The advantage is that since the pressure difference is extremely small when the air pump is working, the efficiency of extracting gas is greatly improved, the air flow of the entire gas detection gas path is greatly increased, and the air flow in the detection gas chamber is also significantly increased, which is conducive to improving the accuracy of gas detection.

[0008] The detection principle of the differential pressure detection component is: extend the collection ends of the first gas passage and the second gas passage into the confluence pipe, and control the collection end of the first gas passage to face the direction of the airflow. Under the control of the MCU chip, the three three-way solenoid valves, three-way solenoid valve one and three-way solenoid valve two are in the on state, three-way solenoid valve three is in the off state, and the normal pressure joints on the three three-way solenoid valves are all in the closed state. In this way, the differential pressure sensor can collect the air pressure in the first gas passage and the second gas passage at the same time, and then the gas flow rate can be obtained by calculation through the formula.

[0009] Compared with the prior art, the present invention also has a gas passage backwashing function. Specifically: the MCU chip will perform multiple differential pressure detection procedures, and between the two differential pressure detection procedures, the MCU chip will intersperse the backwashing procedure. The principle of the backwashing procedure is: the three-way solenoid valve is controlled to be in a completely open and closed state, and the normal pressure joints on the three-way solenoid valve one and the three-way solenoid valve two are connected to the first gas passage and the second gas passage. Since the manifold is in a negative pressure state, the pressure difference effect will cause the air in the external environment to flow into the manifold through the first gas passage and the second gas passage, and then flush the collection end of the gas passage, blowing away the liquid or solid particles that are blocked or adsorbed in the gas passage.

[0010] At the same time, the present invention also has a zero point reset program, and the MCU chip will regularly perform a zero point reset program on the differential pressure sensor. The principle of the zero point reset program is: the three-way solenoid valve 1 and the three-way solenoid valve 2 are controlled to be disconnected, and the three-way solenoid valve 3 will connect all three connectors. At this time, part of the first gas passage, part of the second gas passage and the third gas passage are all connected to the external normal pressure environment, and the air pressure at the two detection ends of the differential pressure sensor remains consistent. Due to the phenomenon of zero point drift, the differential pressure sensor may still be able to collect differential pressure data, and the MCU chip can collect and record the error value, and in the subsequent detection process, the subsequent differential pressure detection value is calculated, and the error value caused by the zero point drift is deducted, so that the data obtained is more accurate.

[0011] Furthermore, it also includes an absolute pressure sensor and a fourth gas passage connected to its detection end, the fourth gas passage is connected to the second gas passage; a thermal resistor is arranged on the outside of the first gas passage and the second gas passage, and the thermal resistor and the absolute pressure sensor are both controlled by the MCU chip. The gas flow rate value detected by the present invention is the real-time working condition flow rate, and to obtain the standard condition flow rate, temperature and pressure compensation is also required during the detection process. The absolute pressure sensor can detect the absolute pressure value in the manifold through the fourth gas passage and the second gas passage, and the thermal resistor can perform temperature compensation on the first gas passage and the second gas passage.

[0012] Furthermore, the normal pressure joints of the three-way solenoid valve 1 and the three-way solenoid valve 2 are both connected to air filters for filtering the inhaled external air during the backwashing process.

[0013] Furthermore, a temperature sensor is provided on the air extraction circuit, and the temperature sensor is controlled by the Bluetooth main control chip. An air filter can also be provided at the collection end of the air extraction circuit to prevent liquid droplets and solid particles in the manifold from being sucked into the interior of the present invention.

[0014] Therefore, compared with the prior art, the present invention has the following characteristics: 1. The present invention has the functions of methane concentration detection and gas flow rate detection, wherein the gas detection component has a higher exhaust flow rate than the prior art, which is beneficial to improving the accuracy of gas detection; 2. It also has a gas passage backwashing function, which is used to blow away liquid or solid particles that are blocked or adsorbed in the gas passage, to avoid inaccurate detection values ​​due to blockage; 3. The present invention also has a zero point recording function. In the subsequent detection process, the subsequent differential pressure detection values ​​are calculated, and the error value caused by the zero point drift is deducted, so that the data obtained is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 is a system control diagram of the present invention; Attached Figure 2 It is a schematic diagram of the structure of the gas detection component; Attached Figure 3 It is a structural schematic diagram of the differential pressure detection component; Attached Figure 4 It is a structural diagram of one side of the flange of the Pitot tube; Attached Figure 5 It is a schematic diagram of the three-dimensional structure of the Pitot tube. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0018] Example 1: See Figure 1 , Figure 2 and Figure 3A manifold comprehensive parameter measuring instrument includes a gas detection component and a differential pressure detection component. The gas detection component is composed of a Bluetooth main control chip, an air pump 10, an air extraction gas path 21, an exhaust gas path 22, a detection gas chamber 30 and a gas sensor 40 group. The air extraction gas path is connected to the air extraction port of the air pump, and the exhaust gas path is connected to the exhaust port of the air pump. The air inlet end of the air extraction gas path and the exhaust end of the exhaust gas path are both connected to the manifold. The detection gas chamber is connected to the air extraction gas path. The gas sensor group is arranged on the detection gas chamber. The gas sensor group includes a CH4 sensor, a CO sensor, etc. The air pump and the gas sensor group are both controlled by the Bluetooth main control chip; the differential pressure detection component includes an MCU chip, a first gas passage 50, a second gas passage 60 and a differential pressure sensor 70. The two gas passages are respectively connected to the differential pressure sensor The two detection ends on the gas passage are connected, the collection end of the first gas passage is oriented towards the gas direction facing the manifold, and the collection end of the second gas passage is oriented away from the gas direction facing the manifold. A three-way solenoid valve 1 81 is provided on the first gas passage, and a three-way solenoid valve 2 82 is provided on the second gas passage. A third gas passage 90 is also connected between the first gas passage and the second gas passage. The third gas passage is at a connection node between the first gas passage and the second gas passage, between the differential pressure sensor and the three-way solenoid valve 1 and the three-way solenoid valve 2. A three-way solenoid valve 3 83 is provided on the third gas passage. All three-way solenoid valves are controlled by the MCU chip, and two connectors in the three-way solenoid valve are connected in series with the corresponding gas passages, and the third connectors of the three-way solenoid valves are all normal pressure connectors 801 exposed to a normal pressure environment.

[0019] The detection principle of the gas detection component is: connect the suction gas path and the exhaust gas path to the detection port on the manifold, control the air pump to generate negative pressure through the Bluetooth main control chip, and the suction gas path extracts the gas in the manifold into the detection gas chamber. The gas sensor group can collect different gas data, and the Bluetooth main control chip can receive and store the collected data and transmit it through Bluetooth. The exhaust gas path is used to discharge the exhaust gas generated by the air pump back into the manifold. Through the above technical scheme, the present invention can ensure that the air pressure in the entire suction gas path, the exhaust gas path and the detection gas chamber is close to the air pressure in the manifold. The advantage is that since the pressure difference is extremely small when the air pump is working, the efficiency of extracting gas is greatly improved, the air flow of the entire gas detection gas path is greatly increased, and the air flow in the detection gas chamber is also significantly increased, which is conducive to improving the accuracy of gas detection.

[0020] The detection principle of the differential pressure detection component is: extend the collection ends of the first gas passage and the second gas passage into the confluence pipe, and control the collection end of the first gas passage to face the direction of the airflow. Under the control of the MCU chip, the three three-way solenoid valves, three-way solenoid valve one and three-way solenoid valve two are in the on state, three-way solenoid valve three is in the off state, and the normal pressure joints on the three three-way solenoid valves are all in the closed state. In this way, the differential pressure sensor can collect the air pressure in the first gas passage and the second gas passage at the same time, and then the gas flow rate can be obtained by calculation through the formula.

[0021] Compared with the prior art, this embodiment also has a gas passage backwashing function. Specifically: the MCU chip will perform multiple differential pressure detection procedures, and between the two differential pressure detection procedures, the MCU chip will intersperse the backwashing procedure. The principle of the backwashing procedure is: the three-way solenoid valve is controlled to be in a completely open and closed state, and the normal pressure joints on the three-way solenoid valve one and the three-way solenoid valve two are connected to the first gas passage and the second gas passage. Since the manifold is in a negative pressure state, the pressure difference effect will cause the air in the external environment to flow into the manifold through the first gas passage and the second gas passage, and then flush the collection end of the gas passage, blowing away the liquid or solid particles that are blocked or adsorbed in the gas passage.

[0022] At the same time, this embodiment also has a zero point reset program, and the MCU chip will periodically perform a zero point reset program on the differential pressure sensor. The principle of the zero point reset program is: the three-way solenoid valve 1 and the three-way solenoid valve 2 are controlled to be disconnected, and the three-way solenoid valve 3 will connect all three connectors. At this time, part of the first gas passage, part of the second gas passage and the third gas passage are all connected to the external normal pressure environment, and the air pressure at the two detection ends of the differential pressure sensor remains consistent. Due to the phenomenon of zero point drift, the differential pressure sensor may still be able to collect differential pressure data, and the MCU chip can collect and record the error value, and in the subsequent detection process, the subsequent differential pressure detection value is calculated, and the error value caused by the zero point drift is deducted, so that the data obtained is more accurate.

[0023] See Figure 3 and Figure 4 , this embodiment also includes an absolute pressure sensor 200 and a fourth gas passage 210 connected to its detection end, the fourth gas passage is connected to the second gas passage; a thermal resistor 84 is provided on the outside of the first gas passage and the second gas passage, and both the thermal resistor and the absolute pressure sensor are controlled by the MCU chip. The gas flow rate value detected by the present invention is the real-time working condition flow rate, and to obtain the standard condition flow rate, temperature and pressure compensation is also required during the detection process. The absolute pressure sensor can detect the absolute pressure value in the manifold through the fourth gas passage and the second gas passage, and the thermal resistor can perform temperature compensation on the first gas passage and the second gas passage.

[0024] See Figure 3The normal pressure joints of the three-way solenoid valve 1 and the three-way solenoid valve 2 are both connected with an air filter 100, which is used to filter the inhaled external air during the backwashing process.

[0025] See Figure 2 A temperature sensor 110 is also provided on the exhaust gas path, and the temperature sensor is controlled by the Bluetooth main control chip. An air filter can also be provided at the collection end of the exhaust gas path to prevent liquid droplets and solid particles in the conduit from being sucked into the interior of this embodiment.

[0026] See Figure 1 This embodiment also includes a built-in power supply for supplying power to the Bluetooth main control chip and the MCU chip. The rated voltage of the built-in power supply is DC12.6V, and the operating current is ≤350mA.

[0027] See Figure 1 The present embodiment also includes a mainframe and a handheld probe, which are electrically connected. The mainframe and the handheld probe of the present embodiment are conventionally shaped, so they are not paired. The handheld probe is provided with a pitot tube 300 (see FIG. Figure 4 and Figure 5 ), the inner end of the pitot tube is provided with a flange portion 310 fixedly connected to the handheld probe, and the pitot tube is formed with a through-flowing suction chamber 320, an exhaust chamber 330, a high-pressure chamber 340 and a low-pressure chamber 350, the inner end openings of the suction chamber and the exhaust chamber are respectively connected to the suction gas path and the exhaust gas path, and the outer end openings of the suction chamber and the exhaust chamber are both located on the outer end surface of the pitot tube; the high-pressure chamber is part of the first gas path, and the low-pressure chamber is part of the second gas path. The outer end openings of the high-pressure chamber and the low-pressure chamber are located on the side wall of the pitot tube near the outer end and are distributed in opposite directions. A heating ring 360 is sleeved on one end of the pitot tube 300 close to the flange portion, and the thermal resistor is located in the heating ring.

[0028] The Bluetooth main control chip, air pump, built-in power supply, detection gas chamber and gas sensor group are all installed in the main box, and the MCU chip, differential pressure sensor, first gas passage, second gas passage, third gas passage and three three-way solenoid valves are all installed in the handheld probe.

[0029] The present invention can be modified in various ways which are obvious to those skilled in the art, and such modifications are not considered to depart from the scope of the present invention. All such modifications which are obvious to those skilled in the art are intended to be included within the scope of the present claims.

Claims

1. A manifold comprehensive parameter measuring instrument, comprising a gas detection component and a differential pressure detection component, characterized in that: The gas detection component is composed of a Bluetooth main control chip, an air pump, an air suction path, an exhaust path, a detection gas chamber and a gas sensor group. The air suction path is connected to the air suction port of the air pump, and the exhaust path is connected to the exhaust port of the air pump. The air inlet end of the air suction path and the exhaust end of the exhaust path are both connected to the manifold. The detection gas chamber is connected to the air suction path. The gas sensor group is arranged on the detection gas chamber. The gas sensor group includes a CH4 sensor. The air pump and the gas sensor group are both controlled by the Bluetooth main control chip. The differential pressure detection component includes an MCU chip, a first gas path, a second gas path, and a second gas path. The two gas passages are connected with the two detection ends on the differential pressure sensor respectively, the collecting end of the first gas passage faces the gas direction of the manifold, and the collecting end of the second gas passage faces the gas direction away from the manifold. A three-way solenoid valve 1 is provided on the first gas passage, a three-way solenoid valve 2 is provided on the second gas passage, a third gas passage is connected between the first gas passage and the second gas passage, a three-way solenoid valve 3 is provided on the third gas passage, all the three-way solenoid valves are controlled by the MCU chip, and the third joints of the three-way solenoid valves are all normal pressure joints exposed to a normal pressure environment.

2. The comprehensive parameter measuring instrument for manifolds according to claim 1, characterized in that: It also includes an absolute pressure sensor and a fourth gas passage connected to its detection end, and the fourth gas passage is connected to the second gas passage; a thermistor is provided on the outside of the first gas passage and the second gas passage, and the thermistor and the absolute pressure sensor are both controlled by the MCU chip.

3. The comprehensive parameter measuring instrument for manifolds according to claim 1 or 2, characterized in that: The normal pressure joints of the three-way solenoid valve 1 and the three-way solenoid valve 2 are both connected with air filters.

4. The comprehensive parameter measuring instrument for manifolds according to claim 3, characterized in that: A temperature sensor is also provided on the air extraction path, and the temperature sensor is controlled by the Bluetooth main control chip.

5. The comprehensive parameter measuring instrument for manifolds according to claim 4, characterized in that: It also includes a built-in power supply for supplying power to the Bluetooth main control chip and the MCU chip.

6. The instrument for measuring the comprehensive parameters of a manifold according to claim 5, characterized in that: The utility model comprises a main box and a handheld probe, and electrical connection is achieved between the two. A pitot tube is provided on the handheld probe, and the inner end of the pitot tube is provided with a flange portion fixedly connected to the handheld probe. A through-flowing suction chamber, an exhaust chamber, a high-pressure chamber and a low-pressure chamber are formed in the pitot tube. The inner end openings of the suction chamber and the exhaust chamber are respectively connected to the suction gas path and the exhaust gas path, and the outer end openings of the suction chamber and the exhaust chamber are both located on the outer end face of the pitot tube; the high-pressure chamber is a part of the first gas path, and the low-pressure chamber is a part of the second gas path. The outer end openings of the high-pressure chamber and the low-pressure chamber are located on the side wall of the pitot tube close to the outer end and are distributed in opposite directions.

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