Pipeline gas sampling and calibration system and method and gas path backwashing method

Abstract

The invention discloses a pipeline gas sampling and calibration system which comprises a sampling device, the other end, away from a gas pipeline, of the sampling device is detachably connected with a gas detection sensor, the gas detection sensor is provided with a gas sample connector, the sampling device comprises an electric control piston valve assembly, and a gas sample channel is correspondingly arranged on the electric control piston valve assembly. The gas sample passage is in butt joint with the gas sample interface; the electronic control piston valve assembly is further provided with a calibration gas circuit, the calibration gas circuit is communicated with the sliding way, a calibration exhaust port is formed in the sliding way, the electronic control piston valve assembly further comprises a control system, and the control system comprises a control module, an operation module and a data acquisition module. When gas sampling or calibration is carried out, a control instruction is sent to the control module through the operation module so as to control the gas detection sensor, the electric control piston valve assembly and the first gas valve to carry out gas sampling or calibration, and the data acquisition module can acquire detection data transmitted by the gas detection sensor in real time in the gas detection process.

Description

Technical Field

[0001] The invention relates to the field of pipeline gas parameter detection, and in particular to a pipeline gas sampling and calibration system and method, and a gas path backwashing method. Background Art

[0002] For some current gas pipelines, such as those that continuously transport toxic and harmful gases or pressurized gases, it is necessary to regularly monitor the gas in the pipelines so as to promptly detect problems with the gas pipelines.

[0003] Gas pipeline parameter monitoring often includes flow, temperature, and gas concentration monitoring. Whether it is a split sensor or an integrated multi-parameter sensor, regular calibration and maintenance are required. The sensor needs to be calibrated for zero point or linearity to ensure the accuracy of sensor monitoring.

[0004] At present, most sensors on the market mainly change the gas path by adjusting the three-valve group or the multi-valve group, thereby creating conditions for flow or gas concentration correction. Whether it is a three-valve group or a multi-valve group, it contains multiple valve stems such as high-end pressure valve, low-end pressure valve, balancing valve, and monitoring gas path on-off valve. Manually loosening and tightening the valve stems one by one is more complicated, and the synchronization of valve stem tightening is poor.

[0005] Moreover, when the sensor needs to be calibrated, manual calibration is also required.

[0006] Manual monitoring and manual calibration both require operators to be close to the gas pipeline, which may cause harm to personnel. In addition, due to the need for frequent manual operations, it is difficult to achieve a high monitoring frequency, and it is difficult to achieve automatic monitoring and automatic calibration of the gas pipeline, and thus it is difficult to detect problems with the gas pipeline in a timely manner.

[0007] Therefore, it is necessary to improve the gas pipeline sampling and calibration methods in response to the above-mentioned technical problems and to enhance the degree of automation of gas pipeline parameter monitoring. Summary of the invention

[0008] The purpose of the present invention is to provide a pipeline gas sampling and calibration system and method, and a gas line backwashing method to solve the technical problem that the current monitoring of gas pipelines often adopts manual monitoring and manual calibration, which requires frequent manual operations, is difficult to achieve a high monitoring frequency, is difficult to achieve automatic monitoring and automatic calibration of gas pipelines, and thus is difficult to promptly discover problems existing in the gas pipeline.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions: In a first aspect, the present invention discloses a pipeline gas sampling and calibration system, comprising a sampling device, the sampling device is used to be installed in a gas pipeline and sample the gas in the gas pipeline; the sampling device is detachably connected to a gas detection sensor at the other end away from the gas pipeline, for detecting gas parameters; Correspondingly, the gas detection sensor is provided with a gas sample interface, the sampling device includes an electrically controlled piston valve assembly, and the electrically controlled piston valve assembly is correspondingly provided with a gas sample passage, and the gas sample passage is connected to the gas sample interface; The electronically controlled piston valve assembly is also provided with a calibration gas circuit, the gas inlet end of the calibration gas circuit is connected to a standard gas cylinder, and the gas outlet of the standard gas cylinder is provided with a first gas valve for introducing standard gas into the calibration gas circuit; It also includes a control system, which includes a control module, an operating module and a data acquisition module; the control module is used to control the gas detection sensor, the electronically controlled piston valve assembly and the first gas valve; the operating module is used to send control instructions to the control module; the data acquisition module is used to collect data from the gas detection sensor and transmit the collected data to the control module; when performing gas sampling or calibration, control instructions are sent to the control module through the operating module to control the gas detection sensor, the electronically controlled piston valve assembly and the first gas valve to perform gas sampling or calibration, and during the gas detection process, the data acquisition module can collect the detection data transmitted by the gas detection sensor in real time.

[0010] Normally, a gas detection sensor can detect multiple parameters at the same time, or each parameter corresponds to multiple gas circuits. In the prior art, a valve is often set for each gas circuit. During detection, the opening and closing of each valve needs to be manually adjusted, which causes inconvenience to the automatic detection of gas. This solution can automatically and uniformly control the on-off of the gas circuit through the cooperation of the piston valve assembly and the control system with the gas detection sensor, thereby achieving a higher monitoring frequency of the gas pipeline, realizing automatic monitoring and automatic calibration of the gas pipeline, and thus being able to promptly discover problems with the gas pipeline.

[0011] As an optimized implementation of a pipeline gas sampling and calibration system, the gas sample interface includes an outlet interface and an inlet interface; correspondingly, the gas sample passage includes an inlet passage and an outlet passage; The electrically controlled piston valve assembly comprises a valve seat, a slideway is arranged in the valve seat corresponding to the gas sample passage, the slideway is a hollow structure, a valve body is arranged in the slideway, the valve body comprises a valve core, the valve core can slide in the slideway, and the valve core is respectively provided with notch sections corresponding to the gas inlet passage and the gas outlet passage; the calibration gas passage is connected to the slideway, and a calibration exhaust port is arranged in the slideway for discharging the remaining standard gas; The valve body also includes an electromagnetic coil, and the electromagnetic coil; the valve core passes through the center of the electromagnetic coil, and the electromagnetic coil is close to the end of the valve core away from each notch segment, the valve core can be adsorbed by magnetic force, and the two ends of the electromagnetic coil are respectively connected to the positive and negative poles of the external power supply, and the external power supply is electrically connected to the control system. When the control system controls the external power supply to be turned on, the inside of the electromagnetic coil can generate a magnetic field, and generate a magnetic field force on the end of the valve core away from the notch segment, so that the valve core moves in the direction away from the notch segment. At this time, each notch segment leaves the gas sample passage, so that the gas sample passage is disconnected.

[0012] As a preferred embodiment of the electric-controlled piston valve assembly, the valve body includes a housing, the electromagnetic coil is fixed in the housing, and a spring is fixed inside the housing at one end of the valve core away from the notch section. When the electromagnetic coil is not energized, that is, the piston valve assembly is in the initial state, the spring is in a restored state, no elastic deformation occurs, and no elastic potential energy is possessed; when the electromagnetic coil is energized, that is, when the piston valve assembly is working, the valve core moves toward the spring direction and squeezes the spring to cause elastic deformation, and possesses elastic potential energy; when the electromagnetic coil is de-energized, the spring releases the elastic potential energy and pushes the valve core to the initial position.

[0013] As a specific setting mode of the gas sample passage, the inlet passage includes a first inlet passage and a second inlet passage, which are used to introduce gas in the gas pipeline, and the top of the first inlet passage is connected to the inlet interface of the gas detection sensor; the outlet passage includes a first outlet passage and a second outlet passage, which are used to discharge the detected gas, and the top of the first outlet passage is connected to the outlet interface of the gas detection sensor; The first air outlet passage and the first air inlet passage are located vertically above the slide, and the bottom ends of the first air outlet passage and the first air inlet passage are connected to the interior of the slide; the second air outlet passage and the second air inlet passage are located vertically below the slide, and the top ends of the second air outlet passage and the second air inlet passage are connected to the interior of the slide; The valve core is provided with an air outlet notch section corresponding to the first air outlet passage and the second air outlet passage, and the air outlet notch section shrinks radially inward from the outer periphery of the valve core; the valve core is provided with an air inlet notch section corresponding to the first air inlet passage and the second air inlet passage, and the air inlet notch section shrinks radially inward from the outer periphery of the valve core; sealing rings are respectively provided at both ends of the air outlet notch section and the air inlet notch section, and the outer periphery size of the sealing ring matches the inner wall size of the hollow structure of the slideway; The calibration gas path is arranged at a side of the first air inlet passage away from the second air inlet passage, and the calibration exhaust port is arranged at an end of the slideway close to the first air outlet passage.

[0014] When the valve body is powered off, the valve core returns to its initial position under the action of the spring. At this time, the first air outlet passage is connected to the second air outlet passage, and the first air inlet passage is connected to the second air inlet passage, and the first air inlet passage is disconnected from the calibration air passage. When the valve body is powered on, the valve core moves toward the working position in the slide, disconnecting the first air outlet passage from the second air outlet passage, and the first air inlet passage from the second air inlet passage, and connecting the first air inlet passage to the calibration air passage, so as to realize the introduction of standard gas into the first air inlet passage and its corresponding gas sample interface through the calibration air passage. After the standard gas is used for calibration after passing through the gas detection sensor, the remaining standard gas returns to the second slide through the first air outlet passage and is discharged through the calibration exhaust port.

[0015] As a preferred embodiment of the sampling device, the sampling device also includes a sampling tube, one end of the sampling tube is used to extend into the gas pipeline, and can sample the flowing gas in the gas pipeline; the sampling tube includes an air bleed pipeline; the air bleed pipeline includes an air inlet pipeline and an air outlet pipeline, and the air inlet pipeline is provided with an air inlet hole at one end for extending into the gas pipeline, so that the gas to be tested inside the gas pipeline can flow into the air inlet pipeline; the gas outlet hole is provided at the gas flow end of the air outlet pipeline, and the air outlet hole is connected to the external environment where the gas pipeline is located, and is used to guide the gas in the air outlet pipeline to flow out; the bottom end of the second air outlet passage is connected to the air outlet pipeline, and the bottom end of the second air inlet passage is connected to the air inlet pipeline.

[0016] When the electronically controlled piston valve assembly is in the initial state, it can keep the gas sample passage unobstructed, so that the gas to be tested can enter the gas detection sensor through the air bleed line, the gas sample passage and the gas sample interface in sequence; when the electronically controlled piston valve assembly is working, it can disconnect the gas sample passage, preventing the gas to be tested from entering the gas detection sensor through the air bleed line.

[0017] As a preferred embodiment of a pipeline gas sampling and calibration system, a backwash gas circuit is also provided on the valve seat for introducing backwash gas, a backwash gas bottle is installed at the air inlet end of the backwash gas circuit, the backwash gas bottle is filled with pressurized air, and a second gas valve is installed at the air outlet end of the backwash gas bottle. When the backwash gas circuit is connected, the gas sample passage on the valve seat and the air inlet line in the sampling tube can be backwashed to keep the detection gas circuit unobstructed; the sampling tube is coated with a heating device on the outer periphery for heating the air inlet line in the sampling tube to enhance the backwash effect, and the heating device is electrically connected to the control system.

[0018] In a second aspect, the present invention further discloses a pipeline gas sampling and calibration method, using the pipeline gas sampling and calibration system as described above, comprising the following steps: First, install the sampling device in the gas pipeline, and install the gas detection sensor at the other end of the sampling device away from the gas pipeline, and ensure that the gas sample passage on the electric control piston valve assembly is connected with the gas sample interface; in the initial state, the gas sample passage is connected with the gas path of the gas sample interface, and the gas sample interface is disconnected from the calibration gas path; then, the gas detection sensor, the electric control piston valve assembly and the first gas valve are electrically connected to the control system respectively; Then the gas in the gas pipeline is sampled, and a sampling instruction is sent to the control module through the operation module. The control module controls the gas detection sensor to enter the detection mode, performs gas parameter detection, and transmits the gas parameter detection data to the data acquisition module; Then, after sampling continues for a preset time, the gas detection sensor is calibrated, and the control module controls the gas detection sensor to enter the calibration mode. The control module then controls the electronically controlled piston valve assembly to start working, disconnecting the gas sample path and the gas sample interface to prevent the gas to be tested in the gas pipeline from entering the gas detection sensor, and at the same time connecting the calibration gas path and the gas sample interface. The control module then controls the first gas valve to open, allowing the standard gas cylinder to pass standard gas into the calibration gas path to calibrate the gas detection sensor.

[0019] The pipeline gas sampling and calibration system comprises a sampling device, which is used to be installed in a gas pipeline and sample the gas in the gas pipeline; the other end of the sampling device away from the gas pipeline is detachably connected to a gas detection sensor for detecting gas parameters; correspondingly, the gas detection sensor is provided with a gas sample interface, and the sampling device comprises an electrically controlled piston valve assembly, and a gas sample passage is correspondingly provided on the electrically controlled piston valve assembly, and the gas sample passage is connected to the gas sample interface; The electronically controlled piston valve assembly is also provided with a calibration gas circuit, the gas inlet end of the calibration gas circuit is connected to a standard gas cylinder, and the gas outlet of the standard gas cylinder is provided with a first gas valve for introducing standard gas into the calibration gas circuit; It also includes a control system, which includes a control module, an operating module and a data acquisition module; the control module is used to control the gas detection sensor, the electronically controlled piston valve assembly and the first gas valve; the operating module is used to send control instructions to the control module; the data acquisition module is used to collect data from the gas detection sensor and transmit the collected data to the control module; when performing gas sampling or calibration, control instructions are sent to the control module through the operating module to control the gas detection sensor, the electronically controlled piston valve assembly and the first gas valve to perform gas sampling or calibration, and during the gas detection process, the data acquisition module can collect the detection data transmitted by the gas detection sensor in real time.

[0020] Preferably, a calibration time interval is set in the control module in advance. When the calibration time interval requirement is met, the control module controls the gas detection sensor to enter the calibration mode, and then the control module controls the electronically controlled piston valve assembly to start working, disconnecting the gas sample path and the gas sample interface, preventing the gas to be tested in the gas pipeline from entering the gas detection sensor, and connecting the calibration gas path and the gas sample interface at the same time, and then the control module controls the first gas valve to open, so that the standard gas cylinder passes standard gas into the calibration gas path to calibrate the gas detection sensor; the calibrated standard gas is discharged through the calibration exhaust port; after the calibration is completed, the control module controls the first gas valve to close, and controls the electronically controlled piston valve assembly to stop working, connects the gas sample path and the gas sample interface, controls the gas detection sensor to enter the detection mode, and continues to detect gas parameters.

[0021] In a third aspect, the present invention further discloses a pipeline gas sampling and calibration method, using the pipeline gas sampling and calibration system as described above, comprising the following steps: First, install the sampling device in the gas pipeline, and connect the gas detection sensor to the valve seat in the sampling device, and ensure that the top of the first air inlet passage on the valve seat is docked and connected with the air inlet interface of the gas detection sensor, and the top of the first air outlet passage is docked and connected with the air outlet interface of the gas detection sensor; In the initial state, the first air outlet passage is connected to the second air outlet passage through the air outlet notch section, the first air inlet passage is connected to the second air inlet passage through the air inlet notch section, and the first air inlet passage is disconnected from the calibration air path; then the gas detection sensor, the valve body and the first air valve are electrically connected to the control system respectively; Then, the gas in the gas pipeline is sampled, and a sampling instruction is sent to the control module through the operation module. The control module controls the gas detection sensor to enter the detection mode, performs gas parameter detection, and transmits the gas parameter detection data to the data acquisition module; Then, after the sampling continues for a preset time, the gas detection sensor is calibrated, and the control module controls the gas detection sensor to enter the calibration mode, and then the control module controls the valve body to start working, and the electromagnetic coil in the valve body controls the valve core to slide in the slideway toward the direction of sliding out of the slideway, so that the air outlet notch section is away from the first air outlet passage and the second air outlet passage to disconnect them, and at the same time, the air inlet notch section is away from the first air inlet passage and the second air inlet passage to disconnect them; at the same time, the air inlet notch section connects the first air inlet passage with the calibration air path, and then the control module controls the first gas valve to open, so that the standard gas cylinder passes the standard gas into the calibration air path, and the gas detection sensor is calibrated; the calibrated standard gas is discharged through the calibration exhaust port; After the calibration is completed, the control module controls the first gas valve to close, and controls the electronically controlled piston valve assembly to stop working, connects the first gas outlet passage and the second gas outlet passage, and the first gas inlet passage and the second gas inlet passage, controls the gas detection sensor to enter the detection mode, and continues to detect gas parameters.

[0022] In a fourth aspect, the present invention further discloses a pipeline gas sampling and calibration system gas path backwashing method, using the pipeline gas sampling and calibration system as described above, comprising the following steps: First, install the sampling tube in the gas pipeline, and connect the valve seat to the sampling tube, then connect the gas detection sensor to the valve seat, and ensure that the top of the first air inlet passage on the valve seat is docked and connected with the air inlet interface of the gas detection sensor, and the top of the first air outlet passage is docked and connected with the air outlet interface of the gas detection sensor; In the initial state, the first air outlet passage is connected to the second air outlet passage through the air outlet notch section, the first air inlet passage is connected to the second air inlet passage through the air inlet notch section, and the first air inlet passage is disconnected from the calibration air path, and the first air valve and the second air valve are both in a disconnected state; Then the gas detection sensor, the valve body, the first gas valve and the second gas valve are electrically connected to the control system respectively; Then, the gas in the gas pipeline is sampled, and a sampling instruction is sent to the control module through the operation module. The control module controls the gas detection sensor to enter the detection mode, performs gas parameter detection, and transmits the gas parameter detection data to the data acquisition module; Then, after the sampling continues for a preset time, the control module controls the gas detection sensor to enter the backwash mode, and controls the valve body to start working, and the electromagnetic coil in the valve body controls the valve core to slide in the slideway toward the direction of sliding out of the slideway, so that the air outlet notch section is away from the first air outlet passage and the second air outlet passage to disconnect them, and at the same time, the air inlet notch section is away from the first air inlet passage and the second air inlet passage to disconnect them, at this time, the air inlet notch section connects the first air inlet passage with the calibration air path; Then, the control module controls the heating device to turn on. After the preset heating time, the control module controls the second gas valve to open and keeps the first gas valve closed, so that the backwash gas bottle introduces backwash gas into the backwash gas path, backwashes the gas sample path on the valve seat and the air inlet pipeline in the sampling tube, so as to keep the detection gas path unobstructed; After backwashing is completed, the control module controls the second air valve to close, and controls the electronically controlled piston valve assembly to stop working, connecting the first air outlet passage and the second air outlet passage, and the first air inlet passage and the second air inlet passage, controlling the gas detection sensor to enter the detection mode, and continuing the gas parameter detection.

[0023] The present invention has the following beneficial effects: the present invention can automatically and uniformly control the on-off of the gas circuit through the cooperation of the piston valve assembly and the control system with the gas detection sensor, thereby achieving a higher monitoring frequency of the gas pipeline, realizing automatic monitoring and automatic calibration of the gas pipeline, and thus being able to timely discover problems existing in the gas pipeline, thereby enhancing the understanding of the gas pipeline status and improving the safety of the gas pipeline; in addition, the present invention can also automatically realize the calibration of the gas detection sensor, further improving the detection accuracy of the gas detection sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical solution and advantages of the invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings, in which: Figure 1 It is a schematic diagram of the structure of the pipeline gas sampling and calibration system of the present invention.

[0025] Figure 2 It is a control flow diagram of a control system according to the first embodiment of the present invention.

[0026] Figure 3 It is a schematic diagram of the valve body structure of the present invention.

[0027] Figure 4 It is a structural schematic diagram of the valve core of the present invention connecting the air inlet passage and the air outlet passage.

[0028] Figure 5 It is a structural schematic diagram of the valve core of the present invention connecting the air intake passage and the calibration air passage.

[0029] Figure 6 This is a control flow diagram of a control system according to Embodiment 3 of the present invention.

[0030] Figure 7 It is a schematic diagram of gas flow in the detection mode of the pipeline gas sampling and calibration system of the present invention.

[0031] Figure 8 Schematic diagram of gas flow in calibration mode of the pipeline gas sampling and calibration system of the present invention.

[0032] Fig. 9 Schematic diagram of gas flow in backwash mode of the pipeline gas sampling and calibration system of the present invention.

[0033] Explanation of the reference numerals: 100, gas detection sensor; 200, sampling device; 300, sampling tube; 301, heating device; 400, electric control piston valve assembly; 401, valve seat; 402, slide; 403, valve body; 404, valve core; 406, electromagnetic coil; 407, housing; 408, spring; 409, sealing ring; 500, control system; 501, control module; 502, operation module; 503, data acquisition module; 601, air outlet notch section; 602, air inlet notch section; 603, first air outlet passage; 604, second air outlet passage; 605, first air inlet passage; 606, second air inlet passage; 607, calibration gas path; 608, calibration exhaust port; 609, calibration gas cylinder; 611, backwash gas cylinder; 612, first gas valve; 613, second gas valve. DETAILED DESCRIPTION

[0035] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0036] It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In the description of the present invention, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the invention product is usually placed when used, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In addition, the terms "horizontal", "vertical", etc. do not mean that the components are absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] The present invention can be applied to the automatic monitoring of gas pipelines, and is particularly suitable for gas pipelines that continuously transport toxic and harmful gases or pressurized gases. It solves the technical problem that the current monitoring of gas pipelines often uses manual monitoring and manual calibration, which requires frequent manual operations, is difficult to achieve a high monitoring frequency, and is difficult to achieve automatic monitoring and automatic calibration of gas pipelines, and thus is difficult to promptly discover problems existing in the gas pipeline.

[0038] The pipeline gas sampling and calibration system and method, and the gas path backwashing method disclosed in the present invention have the following technical effects: 1. The present invention can automatically and uniformly control the on-off of the gas circuit through the cooperation of the piston valve assembly and the control system with the gas detection sensor, thereby achieving a higher monitoring frequency of the gas pipeline, realizing automatic monitoring and automatic calibration of the gas pipeline, and thus being able to timely discover problems existing in the gas pipeline, thereby enhancing the understanding of the gas pipeline status and improving the safety of the gas pipeline; in addition, the present invention can also automatically realize the calibration of the gas detection sensor, further improving the detection accuracy of the gas detection sensor.

[0039] 2. The gas pipeline sampling device disclosed in the present invention can realize the drainage of the gas to be tested in the gas pipeline. The piston valve assembly provided can quickly change the on-off state of the detection gas path by controlling the expansion and contraction of the valve core in the valve body. The principle of generating magnetic force by energizing the electromagnetic coil is utilized, and in combination with a spring, the valve core can be simply powered on or off. The connection or disconnection of the sampling gas path, the gas sample path and the gas sample interface can be controlled only by controlling the operation of the piston valve assembly. There is no need to manually loosen or tighten the valve stem one by one, and the operation is simple, thereby improving the on-off synchronization of the gas path.

[0040] 3. The sampling tube and the piston valve assembly, as well as the piston valve assembly and the gas detection sensor in the gas pipeline sampling device of the present invention are all detachably connected. When it is no longer necessary to detect the gas to be tested or when it is necessary to repair the sampling tube, the piston valve assembly or the gas detection sensor, the various components can be removed, which is convenient for operation, maintenance and replacement.

[0041] 4. The pipeline gas sampling and calibration system of the present invention can realize the following control processes: the control system cooperates with the piston valve assembly and the gas detection sensor to automatically and uniformly control the on-off of the gas circuit; the control system cooperates with the piston valve assembly, the first gas valve and the gas detection sensor to realize the calibration of the gas detection sensor; the control system cooperates with the piston valve assembly and the second gas valve to realize the backwash process of the gas circuit.

[0042] 5. The pipeline gas sampling and calibration system of the present invention has a simple structure, is easy to operate, can achieve rapid and accurate control of the gas path, is easy to disassemble and maintain, and has broad application prospects.

[0043] In order to elaborate on the pipeline gas sampling and calibration system and method of the present invention, the present invention discloses the following preferred embodiments.

[0044] Embodiment 1 See also Figure 1 The present embodiment discloses a pipeline gas sampling and calibration system, including a sampling device 200, the sampling device 200 is used to be installed in a gas pipeline and sample the gas in the gas pipeline; the sampling device 200 is detachably connected to a gas detection sensor 100 at the other end away from the gas pipeline, which is used to detect gas parameters; correspondingly, the gas detection sensor 100 is provided with a gas sample interface, and the sampling device 200 includes an electrically controlled piston valve assembly 400, and a gas sample passage is correspondingly provided on the electrically controlled piston valve assembly 400, and the gas sample passage is connected to the gas sample interface; the electrically controlled piston valve assembly 400 is also provided with a calibration gas circuit 607, and the gas inlet end of the calibration gas circuit 607 is connected to a standard gas cylinder, and a first gas valve 612 is installed at the gas outlet of the standard gas cylinder, which is used to pass standard gas into the calibration gas circuit 607; See also Figure 2 , also includes a control system 500, the control system 500 includes a control module 501, an operation module 502 and a data acquisition module 503; the control module 501 is used to control the gas detection sensor 100, the electric control piston valve assembly 400 and the first gas valve 612; the operation module 502 is used to send control instructions to the control module 501; the data acquisition module 503 is used to collect data from the gas detection sensor 100 and transmit the collected data to the control module 501; when performing gas sampling or calibration, a control instruction is sent to the control module 501 through the operation module 502 to control the gas detection sensor 100, the electric control piston valve assembly 400 and the first gas valve 612 to perform gas sampling or calibration. During the gas detection process, the data acquisition module 503 can collect the detection data transmitted by the gas detection sensor 100 in real time.

[0045] Specifically, the gas parameters include one or more combinations of gas concentration, gas temperature, and gas flow rate.

[0046] Specifically, the control module 501 can control the switch of the gas detection sensor 100 and the switching of the working mode. The working mode of the gas detection sensor 100 includes a detection mode and a calibration mode; specifically, the control module 501 can also control the opening and closing of the first gas valve 612; specifically, the control module 501 can also control the working state of the electronically controlled piston valve assembly 400.

[0047] Specifically, the signal output end of the operation module 502 is electrically connected to the signal input end of the control module 501. The control items in the operation module 502 corresponding to the control module 501 are respectively provided with operation instructions. Executing the operation instructions corresponding to the control items in the operation module 502 can enable the control module 501 to control the corresponding device to perform corresponding actions.

[0048] Specifically, the data input end of the data acquisition module 503 is electrically connected to the data output end of the gas detection sensor 100, and is used to collect the detection data transmitted by the gas detection sensor 100 in real time for reference or data analysis by operators.

[0049] For this example, see Figure 7 and Figure 8 This embodiment also discloses a pipeline gas sampling and calibration method, using a pipeline gas sampling and calibration system described in this embodiment, including the following steps: First, the sampling device 200 is installed in the gas pipeline, and the gas detection sensor 100 is installed at the other end of the sampling device 200 away from the gas pipeline, and the gas sample passage on the electric control piston valve assembly 400 is connected with the gas sample interface; in the initial state, the gas sample passage is connected with the gas path of the gas sample interface, and the gas sample interface is disconnected from the calibration gas path 607; then the gas detection sensor 100, the electric control piston valve assembly 400 and the first gas valve 612 are electrically connected to the control system 500 respectively; Then the gas in the gas pipeline is sampled, and a sampling instruction is sent to the control module 501 through the operation module 502. The control module 501 controls the gas detection sensor 100 to enter the detection mode, performs gas parameter detection, and transmits the gas parameter detection data to the data acquisition module 503; Then, after sampling continues for a preset time, the gas detection sensor 100 is calibrated, and the control module 501 controls the gas detection sensor 100 to enter the calibration mode. Then, the control module 501 controls the electronically controlled piston valve assembly 400 to start working, disconnecting the gas sample passage and the gas sample interface, preventing the gas to be tested in the gas pipeline from entering the gas detection sensor 100, and connecting the calibration gas path 607 and the gas sample interface at the same time. Then, the control module 501 controls the first gas valve 612 to open, so that the standard gas cylinder passes standard gas into the calibration gas path 607 to calibrate the gas detection sensor 100.

[0050] Preferably, a calibration time interval is set in advance in the control module 501. When the calibration time interval requirement is met, the control module 501 controls the gas detection sensor 100 to enter the calibration mode, and then the control module 501 controls the electronically controlled piston valve assembly 400 to start working, disconnecting the gas sample passage and the gas sample interface, preventing the gas to be tested in the gas pipeline from entering the gas detection sensor 100, and connecting the calibration gas passage 607 and the gas sample interface at the same time, and then the control module 501 controls the first gas valve 612 to open, so that the standard gas cylinder passes standard gas into the calibration gas passage 607, and calibrates the gas detection sensor 100; after the calibration is completed, the control module 501 controls the first gas valve 612 to close, and controls the electronically controlled piston valve assembly 400 to stop working, connects the gas sample passage and the gas sample interface, controls the gas detection sensor 100 to enter the detection mode, and continues to detect gas parameters.

[0051] This embodiment, through the cooperation of the piston valve assembly and the control system 500 with the gas detection sensor 100, can automatically and uniformly control the on-off of the gas path, thereby achieving a higher monitoring frequency of the gas pipeline, realizing automatic monitoring and automatic calibration of the gas pipeline, and thus being able to timely discover problems existing in the gas pipeline, thereby strengthening the mastery of the gas pipeline status and improving the safety of the gas pipeline. In addition, this embodiment can also automatically realize the calibration of the gas detection sensor 100, further improving the detection accuracy of the gas detection sensor 100.

[0052] Embodiment 2 Based on the first embodiment, this embodiment discloses a pipeline gas sampling and calibration system.

[0053] See also Figure 3 , the gas sample interface includes an outlet interface and an inlet interface; correspondingly, the gas sample passage includes an inlet passage and an outlet passage; the electric-controlled piston valve assembly 400 includes a valve seat 401, a slideway 402 is provided in the valve seat 401 corresponding to the gas sample passage, the slideway 402 is a hollow structure, a valve body 403 is provided in the slideway 402, the valve body 403 includes a valve core 404, the valve core 404 can slide in the slideway 402, and the valve core 404 is provided with notch sections corresponding to the inlet passage and the outlet passage respectively; the calibration gas path 607 is connected to the slideway 402, and a calibration exhaust port 608 is provided in the slideway 402 for discharging the remaining standard gas; The valve body 403 also includes an electromagnetic coil 406, and the electromagnetic coil 406; the valve core 404 passes through the center of the electromagnetic coil 406, and the electromagnetic coil 406 is close to the end of the valve core 404 away from each notch segment, the valve core 404 can be adsorbed by magnetic force, and the two ends of the electromagnetic coil 406 are respectively connected to the positive and negative poles of the external power supply, and the external power supply is electrically connected to the control system 500. When the control system 500 controls the external power supply to be turned on, the inside of the electromagnetic coil 406 can generate a magnetic field, and generate a magnetic field force on the end of the valve core 404 away from the notch segment, so that the valve core 404 moves in the direction away from the notch segment. At this time, each notch segment leaves the gas sample passage, so that the gas sample passage is disconnected.

[0054] The valve body 403 includes a housing 407, the electromagnetic coil 406 is fixed in the housing 407, and a spring 408 is fixed inside the housing 407 at one end of the valve core 404 away from the notch section. When the electromagnetic coil 406 is not energized, that is, the piston valve assembly is in the initial state, the spring 408 is in a restored state, has not undergone elastic deformation, and has no elastic potential energy; when the electromagnetic coil 406 is energized, that is, when the piston valve assembly is working, the valve core 404 moves toward the direction of the spring 408, and squeezes the spring 408 to make it undergo elastic deformation, and has elastic potential energy. When the electromagnetic coil 406 is de-energized, the spring 408 releases the elastic potential energy and pushes the valve core 404 to the initial position.

[0055] See also Figures 4 to 5 The inlet passage includes a first inlet passage 605 and a second inlet passage 606, which are used to introduce gas from the gas pipeline, and the top of the first inlet passage 605 is connected to the inlet interface of the gas detection sensor 100; the outlet passage includes a first outlet passage 603 and a second outlet passage 604, which are used to discharge the detected gas, and the top of the first outlet passage 603 is connected to the outlet interface of the gas detection sensor 100; The first air outlet passage 603 and the first air inlet passage 605 are located vertically above the slide 402, and the bottom ends of the first air outlet passage 603 and the first air inlet passage 605 are connected to the inside of the slide 402; the second air outlet passage 604 and the second air inlet passage 606 are located vertically below the slide 402, and the top ends of the second air outlet passage 604 and the second air inlet passage 606 are connected to the inside of the slide 402; The valve core 404 is provided with an air outlet notch section 601 corresponding to the first air outlet passage 603 and the second air outlet passage 604, and the air outlet notch section 601 shrinks radially inward from the outer periphery of the valve core 404; the valve core 404 is provided with an air inlet notch section 602 corresponding to the first air inlet passage 605 and the second air inlet passage 606, and the air inlet notch section 602 shrinks radially inward from the outer periphery of the valve core 404; sealing rings 409 are respectively provided at both ends of the air outlet notch section 601 and the air inlet notch section 602, and the outer peripheral size of the sealing ring 409 matches the inner wall size of the hollow structure of the slide 402; the calibration air path 607 is arranged on the side of the first air inlet passage 605 away from the second air inlet passage 606, and the calibration exhaust port 608 is arranged at the end of the slide 402 close to the first air outlet passage 603.

[0056] The valve body structure of this embodiment can automatically reset itself after power failure to connect the gas sample passage, reduce manual operation, reduce the complexity of operation, and improve the degree of automation; the setting of each passage can prevent the gas to be tested in the gas pipeline from causing excessive gas flow rate in the gas sample passage due to the effect of air pressure when the gas sample passage is connected, thereby causing damage to various mechanical structures; the setting of the sealing ring 409 can ensure that when the various gas sample passages are connected, no gas escape and cross-flow will occur between each notch section; when the valve body 403 is powered off, the valve core 404 returns to its initial position under the action of the spring 408, and at this time the first gas outlet passage 603 and the second gas outlet passage 604, as well as the first gas inlet passage 605 and the second gas inlet passage 606 is connected, and the first air inlet passage 605 is disconnected from the calibration air passage 607; when the valve body 403 is energized, the valve core 404 moves toward the working position in the slide 402, and the first air outlet passage 603 is disconnected from the second air outlet passage 604, and the first air inlet passage 605 is disconnected from the second air inlet passage 606, and the first air inlet passage 605 is connected to the calibration air passage 607, so as to realize the introduction of standard gas into the first air inlet passage 605 and its corresponding gas sample interface through the calibration air passage 607. After the standard gas is used for calibration after passing through the gas detection sensor 100, the remaining standard gas returns to the second slide 402 through the first air outlet passage 603 and is discharged through the calibration exhaust port 608.

[0057] For this example, see Figures 7 and 8 This embodiment also discloses a pipeline gas sampling and calibration method, using a pipeline gas sampling and calibration system described in this embodiment, including the following steps: First, the sampling device 200 is installed in the gas pipeline, and the gas detection sensor 100 is connected to the valve seat 401 in the sampling device 200, and the top of the first air inlet passage 605 on the valve seat 401 is connected to the air inlet interface of the gas detection sensor 100 and connected, and the top of the first air outlet passage 603 is connected to the air outlet interface of the gas detection sensor 100 and connected; In the initial state, the first gas outlet passage 603 is connected to the second gas outlet passage 604 through the gas outlet notch section 601, the first gas inlet passage 605 is connected to the second gas inlet passage 606 through the gas inlet notch section 602, and the first gas inlet passage 605 is disconnected from the calibration gas passage 607; then the gas detection sensor 100, the valve body 403 and the first gas valve 612 are electrically connected to the control system 500 respectively; Then, the gas in the gas pipeline is sampled, and a sampling instruction is sent to the control module 501 through the operation module 502. The control module 501 controls the gas detection sensor 100 to enter the detection mode, performs gas parameter detection, and transmits the gas parameter detection data to the data acquisition module 503; Then, after the sampling continues for a preset time, the gas detection sensor 100 is calibrated, and the control module 501 controls the gas detection sensor 100 to enter the calibration mode, and then the control module 501 controls the valve body 403 to start working, and the electromagnetic coil 406 in the valve body 403 controls the valve core 404 to slide in the slideway 402 in the direction of sliding out of the slideway 402, so that the air outlet notch section 601 is away from the first air outlet passage 603 and the second air outlet passage 604 to disconnect them, and at the same time, the air inlet notch section 602 is away from the first air inlet passage 605 and the second air inlet passage 606 to disconnect them; at the same time, the air inlet notch section 602 connects the first air inlet passage 605 with the calibration gas path 607, and then the control module 501 controls the first gas valve 612 to open, so that the standard gas cylinder passes the standard gas into the calibration gas path 607, and the gas detection sensor 100 is calibrated; the calibrated standard gas is discharged through the calibration exhaust port 608; After the calibration is completed, the control module 501 controls the first gas valve 612 to close, and controls the electronically controlled piston valve assembly 400 to stop working, connects the first gas outlet passage 603 and the second gas outlet passage 604, and the first gas inlet passage 605 and the second gas inlet passage 606, controls the gas detection sensor 100 to enter the detection mode, and continues to detect gas parameters.

[0058] This embodiment has the following control processes: the control system 500 cooperates with the piston valve assembly and the gas detection sensor 100 to automatically and uniformly control the on-off of the gas circuit; the control system 500 cooperates with the piston valve assembly, the first gas valve 612 and the gas detection sensor 100 to realize the calibration of the gas detection sensor 100.

[0059] This embodiment, through the cooperation of the piston valve assembly and the control system 500 with the piston valve assembly, the first gas valve 612 and the gas detection sensor 100, can automatically and uniformly control the on-off of the gas path, thereby achieving a higher monitoring frequency of the gas pipeline, realizing automatic monitoring and automatic calibration of the gas pipeline, and thus being able to timely discover problems existing in the gas pipeline, thereby strengthening the understanding of the gas pipeline status and improving the safety of the gas pipeline. In addition, this embodiment can also automatically realize the calibration of the gas detection sensor 100, further improving the detection accuracy of the gas detection sensor 100.

[0060] Embodiment 3 See also Figure 1 and Figure 6 A pipeline gas sampling and calibration system of this embodiment is based on the second embodiment, and the sampling device 200 also includes a sampling tube 300, one end of which is used to extend into the gas pipeline, and can sample the flowing gas in the gas pipeline; the sampling tube 300 includes an air bleed pipeline; the air bleed pipeline includes an air inlet pipeline and an air outlet pipeline, and the end of the air inlet pipeline used to extend into the gas pipeline is provided with an air inlet hole, which can allow the gas to be tested inside the gas pipeline to flow into the air inlet pipeline; the gas outlet hole is provided at the gas flow end of the air outlet pipeline, and the air outlet hole is connected to the external environment where the gas pipeline is located, and is used to guide the gas in the air outlet pipeline to flow out; the bottom end of the second air outlet passage 604 is connected to the air outlet pipeline, and the bottom end of the second air inlet passage 606 is connected to the air inlet pipeline.

[0061] When the electronically controlled piston valve assembly 400 is in the initial state, it can keep the gas sample passage unobstructed, so that the gas to be tested can enter the gas detection sensor 100 through the air bleed line, the gas sample passage and the gas sample interface in sequence; when the electronically controlled piston valve assembly 400 is working, it can disconnect the gas sample passage, preventing the gas to be tested from entering the gas detection sensor 100 through the air bleed line.

[0062] See also Fig. 9 A backwash gas path is also provided on the valve seat 401 for introducing backwash gas. A backwash gas bottle 611 is installed at the air inlet end of the backwash gas path. The backwash gas bottle 611 is filled with pressurized air. A second air valve 613 is installed at the air outlet end of the backwash gas bottle 611. When the backwash gas path is connected, the gas sample path on the valve seat 401 and the air inlet line in the sampling tube 300 can be backwashed to keep the detection gas path unobstructed; the sampling tube 300 is coated with a heating device 301 on the outer periphery, which is used to heat the air inlet line in the sampling tube 300 to enhance the backwash effect. The heating device 301 is electrically connected to the control system 500.

[0063] In addition to having all the functions of a pipeline gas sampling and calibration system in Example 2, a pipeline gas sampling and calibration system in this embodiment can also backwash the gas path in the sampling device 200 to keep the gas path unobstructed, ensure the accuracy of the detection results, and extend the service life of the sampling device 200.

[0064] For this example, see Figures 7 to 9 This embodiment also discloses a pipeline gas sampling and calibration method, using a pipeline gas sampling and calibration system described in this embodiment, including the following steps: First, install the sampling tube 300 in the gas pipeline, and connect the valve seat 401 to the sampling tube 300, then connect the gas detection sensor 100 to the valve seat 401, and ensure that the top of the first air inlet passage 605 on the valve seat 401 is docked and connected with the air inlet interface of the gas detection sensor 100, and the top of the first air outlet passage 603 is docked and connected with the air outlet interface of the gas detection sensor 100; In the initial state, the first gas outlet passage 603 is connected to the second gas outlet passage 604 through the gas outlet notch section 601, the first gas inlet passage 605 is connected to the second gas inlet passage 606 through the gas inlet notch section 602, and the first gas inlet passage 605 is disconnected from the calibration gas passage 607, and the first gas valve 612 and the second gas valve 613 are both in the disconnected state; Then the gas detection sensor 100, the valve body 403, the first gas valve 612 and the second gas valve 613 are electrically connected to the control system 500 respectively; Then, the gas in the gas pipeline is sampled, and a sampling instruction is sent to the control module 501 through the operation module 502. The control module 501 controls the gas detection sensor 100 to enter the detection mode, performs gas parameter detection, and transmits the gas parameter detection data to the data acquisition module 503; Then, after the sampling continues for a preset time, the control module 501 controls the gas detection sensor 100 to enter the backwash mode, and controls the valve body 403 to start working, and the electromagnetic coil 406 in the valve body 403 controls the valve core 404 to slide in the slideway 402 in the direction of sliding out of the slideway 402, so that the air outlet notch section 601 is away from the first air outlet passage 603 and the second air outlet passage 604 to disconnect them, and at the same time, the air inlet notch section 602 is away from the first air inlet passage 605 and the second air inlet passage 606 to disconnect them, at this time, the air inlet notch section 602 connects the first air inlet passage 605 with the calibration air passage 607; Then, the control module 501 controls the heating device 301 to open. After the preset heating time, the control module 501 controls the second gas valve 613 to open and keeps the first gas valve 612 closed, so that the backwash gas bottle 611 introduces backwash gas into the backwash gas path, and backwashes the gas sample path on the valve seat 401 and the air inlet pipeline in the sampling tube 300 to keep the detection gas path unobstructed; After backwashing is completed, the control module 501 controls the second air valve 613 to close, and controls the electronically controlled piston valve assembly 400 to stop working, connecting the first air outlet passage 603 and the second air outlet passage 604, and the first air inlet passage 605 and the second air inlet passage 606, and controls the gas detection sensor 100 to enter the detection mode to continue gas parameter detection.

[0065] This embodiment has the following control processes: the control system 500 cooperates with the piston valve assembly and the gas detection sensor 100 to automatically and uniformly control the on-off of the gas circuit; the control system 500 cooperates with the piston valve assembly, the first gas valve 612 and the gas detection sensor 100 to realize the calibration of the gas detection sensor 100; the control system 500 cooperates with the piston valve assembly and the second gas valve 613 to realize the backwash process of the gas circuit.

[0066] This embodiment can achieve a higher monitoring frequency for the gas pipeline, realize automatic monitoring, automatic calibration and automatic backwashing of the gas pipeline, and thus can promptly discover problems existing in the gas pipeline, enhance the understanding of the gas pipeline status, improve the safety of the gas pipeline, and improve the detection accuracy of the gas detection sensor 100; it can keep the gas path unobstructed, ensure the accuracy of the detection results, and also extend the service life of the sampling device 200.

[0067] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. The embodiments described in the present invention are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all other embodiments obtained by ordinary technicians in the art without creative work based on the embodiments in the present invention belong to the scope of protection of the present invention.

Claims

1. A pipeline gas sampling and calibration system, characterized in that: The sampling device comprises a sampling device, which is used to be installed in a gas pipeline and sample the gas in the gas pipeline; the other end of the sampling device away from the gas pipeline is detachably connected to a gas detection sensor for detecting gas parameters; correspondingly, the gas detection sensor is provided with a gas sample interface, and the sampling device comprises an electrically controlled piston valve assembly, and a gas sample passage is correspondingly provided on the electrically controlled piston valve assembly, and the gas sample passage is connected to the gas sample interface; The electronically controlled piston valve assembly is also provided with a calibration gas circuit, the gas inlet end of the calibration gas circuit is connected to a standard gas cylinder, and the gas outlet of the standard gas cylinder is provided with a first gas valve for introducing standard gas into the calibration gas circuit; It also includes a control system, which includes a control module, an operating module and a data acquisition module; the control module is used to control the gas detection sensor, the electronically controlled piston valve assembly and the first gas valve; the operating module is used to send control instructions to the control module; the data acquisition module is used to collect data from the gas detection sensor and transmit the collected data to the control module; when performing gas sampling or calibration, control instructions are sent to the control module through the operating module to control the gas detection sensor, the electronically controlled piston valve assembly and the first gas valve to perform gas sampling or calibration, and during the gas detection process, the data acquisition module can collect the detection data transmitted by the gas detection sensor in real time.

2. A pipeline gas sampling and calibration system according to claim 1, characterized in that: The gas sample interface includes an outlet interface and an inlet interface; correspondingly, the gas sample passage includes an inlet passage and an outlet passage; the electric-controlled piston valve assembly includes a valve seat, a slideway is provided in the valve seat corresponding to the gas sample passage, the slideway is a hollow structure, a valve body is provided in the slideway, the valve body includes a valve core, the valve core can slide in the slideway, and the valve core is provided with notch sections corresponding to the inlet passage and the outlet passage respectively; the calibration gas passage is connected to the slideway, and a calibration exhaust port is provided in the slideway for discharging the remaining standard gas; The valve body also includes an electromagnetic coil, and the electromagnetic coil; the valve core passes through the center of the electromagnetic coil, and the electromagnetic coil is close to the end of the valve core away from each notch segment, the valve core can be adsorbed by magnetic force, and the two ends of the electromagnetic coil are respectively connected to the positive and negative poles of the external power supply, and the external power supply is electrically connected to the control system. When the control system controls the external power supply to be turned on, the inside of the electromagnetic coil can generate a magnetic field, and generate a magnetic field force on the end of the valve core away from the notch segment, so that the valve core moves in the direction away from the notch segment. At this time, each notch segment leaves the gas sample passage, so that the gas sample passage is disconnected.

3. A pipeline gas sampling and calibration system according to claim 2, characterized in that: The valve body comprises a shell, the electromagnetic coil is fixed in the shell, and a spring is fixed inside the shell at one end of the valve core away from the notch section.

4. A pipeline gas sampling and calibration system according to claim 2, characterized in that: The air inlet passage includes a first air inlet passage and a second air inlet passage, which are used to introduce gas from the gas pipeline, and the top of the first air inlet passage is connected to the air inlet interface of the gas detection sensor; the air outlet passage includes a first air outlet passage and a second air outlet passage, which are used to discharge the detected gas, and the top of the first air outlet passage is connected to the air outlet interface of the gas detection sensor; The first air outlet passage and the first air inlet passage are located vertically above the slide, and the bottom ends of the first air outlet passage and the first air inlet passage are connected to the interior of the slide; the second air outlet passage and the second air inlet passage are located vertically below the slide, and the top ends of the second air outlet passage and the second air inlet passage are connected to the interior of the slide; The valve core is provided with an air outlet notch section corresponding to the first air outlet passage and the second air outlet passage, and the air outlet notch section shrinks radially inward from the outer periphery of the valve core; the valve core is provided with an air inlet notch section corresponding to the first air inlet passage and the second air inlet passage, and the air inlet notch section shrinks radially inward from the outer periphery of the valve core; sealing rings are respectively provided at both ends of the air outlet notch section and the air inlet notch section, and the outer peripheral size of the sealing ring matches the inner wall size of the hollow structure of the slide; the calibration air path is arranged on the side of the first air inlet passage away from the second air inlet passage, and the calibration exhaust port is arranged at the end of the slide close to the first air outlet passage.

5. A pipeline gas sampling and calibration system according to claim 4, characterized in that: The sampling device also includes a sampling tube, one end of which is used to extend into the gas pipeline so as to sample the flowing gas in the gas pipeline; the sampling tube includes an air bleed pipeline; the air bleed pipeline includes an air inlet pipeline and an air outlet pipeline, and the air inlet pipeline is provided with an air inlet hole at one end thereof which is used to extend into the gas pipeline so as to allow the gas to be tested inside the gas pipeline to flow into the air inlet pipeline; an air outlet hole is provided at the gas flow end of the air outlet pipeline, and the air outlet hole is connected to the external environment where the gas pipeline is located, so as to guide the gas in the air outlet pipeline to flow out; the bottom end of the second air outlet passage is connected to the air outlet pipeline, and the bottom end of the second air inlet passage is connected to the air inlet pipeline.

6. A pipeline gas sampling and calibration system according to claim 5, characterized in that: A backwash gas circuit is also provided on the valve seat for introducing backwash gas, a backwash gas bottle is installed at the air inlet end of the backwash gas circuit, the backwash gas bottle is filled with pressurized air, and a second gas valve is installed at the air outlet end of the backwash gas bottle; a heating device is coated on the outer periphery of the sampling tube for heating the air inlet pipeline in the sampling tube, and the heating device is electrically connected to the control system.

7. A pipeline gas sampling and calibration method, using the pipeline gas sampling and calibration system as claimed in claim 1, characterized in that: The following steps are involved: First, install the sampling device in the gas pipeline, and install the gas detection sensor at the other end of the sampling device away from the gas pipeline, and ensure that the gas sample passage on the electric control piston valve assembly is connected with the gas sample interface; in the initial state, the gas sample passage is connected with the gas path of the gas sample interface, and the gas sample interface is disconnected from the calibration gas path; then, the gas detection sensor, the electric control piston valve assembly and the first gas valve are electrically connected to the control system respectively; Then the gas in the gas pipeline is sampled, and a sampling instruction is sent to the control module through the operation module. The control module controls the gas detection sensor to enter the detection mode, performs gas parameter detection, and transmits the gas parameter detection data to the data acquisition module; Then, after sampling continues for a preset time, the gas detection sensor is calibrated, and the control module controls the gas detection sensor to enter the calibration mode. The control module then controls the electronically controlled piston valve assembly to start working, disconnecting the gas sample path and the gas sample interface to prevent the gas to be tested in the gas pipeline from entering the gas detection sensor, and at the same time connecting the calibration gas path and the gas sample interface. The control module then controls the first gas valve to open, allowing the standard gas cylinder to pass standard gas into the calibration gas path to calibrate the gas detection sensor.

8. The pipeline gas sampling and calibration method according to claim 7, characterized in that: The calibration time interval is set in the control module in advance. When the calibration time interval requirement is met, the control module controls the gas detection sensor to enter the calibration mode, and then the control module controls the electronically controlled piston valve assembly to start working, disconnects the gas sample path and the gas sample interface, and prevents the gas to be tested in the gas pipeline from entering the gas detection sensor. At the same time, the calibration gas path and the gas sample interface are connected, and then the control module controls the first gas valve to open, so that the standard gas cylinder passes the standard gas into the calibration gas path, and calibrates the gas detection sensor; the calibrated standard gas is discharged through the calibration exhaust port; After the calibration is completed, the control module controls the first gas valve to close, controls the electronically controlled piston valve assembly to stop working, connects the gas sample passage and the gas sample interface, controls the gas detection sensor to enter the detection mode, and continues to detect gas parameters.

9. A pipeline gas sampling and calibration method, using the pipeline gas sampling and calibration system as claimed in claim 4, characterized in that: The following steps are involved: First, install the sampling device in the gas pipeline, and connect the gas detection sensor to the valve seat in the sampling device, and ensure that the top of the first air inlet passage on the valve seat is docked and connected with the air inlet interface of the gas detection sensor, and the top of the first air outlet passage is docked and connected with the air outlet interface of the gas detection sensor; In the initial state, the first air outlet passage is connected to the second air outlet passage through the air outlet notch section, the first air inlet passage is connected to the second air inlet passage through the air inlet notch section, and the first air inlet passage is disconnected from the calibration air path; then the gas detection sensor, the valve body and the first air valve are electrically connected to the control system respectively; Then, the gas in the gas pipeline is sampled, and a sampling instruction is sent to the control module through the operation module. The control module controls the gas detection sensor to enter the detection mode, performs gas parameter detection, and transmits the gas parameter detection data to the data acquisition module; Then, after the sampling continues for a preset time, the gas detection sensor is calibrated, and the control module controls the gas detection sensor to enter the calibration mode, and then the control module controls the valve body to start working, and the electromagnetic coil in the valve body controls the valve core to slide in the slideway toward the direction of sliding out of the slideway, so that the air outlet notch section is away from the first air outlet passage and the second air outlet passage to disconnect them, and at the same time, the air inlet notch section is away from the first air inlet passage and the second air inlet passage to disconnect them; at the same time, the air inlet notch section connects the first air inlet passage with the calibration air path, and then the control module controls the first gas valve to open, so that the standard gas cylinder passes the standard gas into the calibration air path, and the gas detection sensor is calibrated; the calibrated standard gas is discharged through the calibration exhaust port; After the calibration is completed, the control module controls the first gas valve to close, and controls the electronically controlled piston valve assembly to stop working, connects the first gas outlet passage and the second gas outlet passage, and the first gas inlet passage and the second gas inlet passage, controls the gas detection sensor to enter the detection mode, and continues to detect gas parameters.

10. A pipeline gas sampling and calibration system gas path backwashing method, using the pipeline gas sampling and calibration system as claimed in claim 6, characterized in that: The following steps are involved: First, install the sampling tube in the gas pipeline, and connect the valve seat to the sampling tube, then connect the gas detection sensor to the valve seat, and ensure that the top of the first air inlet passage on the valve seat is docked and connected with the air inlet interface of the gas detection sensor, and the top of the first air outlet passage is docked and connected with the air outlet interface of the gas detection sensor; In the initial state, the first air outlet passage is connected to the second air outlet passage through the air outlet notch section, the first air inlet passage is connected to the second air inlet passage through the air inlet notch section, and the first air inlet passage is disconnected from the calibration air path, and the first air valve and the second air valve are both in a disconnected state; Then the gas detection sensor, the valve body, the first gas valve and the second gas valve are electrically connected to the control system respectively; Then, the gas in the gas pipeline is sampled, and a sampling instruction is sent to the control module through the operation module. The control module controls the gas detection sensor to enter the detection mode, performs gas parameter detection, and transmits the gas parameter detection data to the data acquisition module; Then, after the sampling continues for a preset time, the control module controls the gas detection sensor to enter the backwash mode, and controls the valve body to start working, and the electromagnetic coil in the valve body controls the valve core to slide in the slideway toward the direction of sliding out of the slideway, so that the air outlet notch section is away from the first air outlet passage and the second air outlet passage to disconnect them, and at the same time, the air inlet notch section is away from the first air inlet passage and the second air inlet passage to disconnect them, at this time, the air inlet notch section connects the first air inlet passage with the calibration air path; Then, the control module controls the heating device to turn on. After the preset heating time, the control module controls the second gas valve to open and keeps the first gas valve closed, so that the backwash gas bottle introduces backwash gas into the backwash gas path, backwashes the gas sample path on the valve seat and the air inlet pipeline in the sampling tube, so as to keep the detection gas path unobstructed; After backwashing is completed, the control module controls the second air valve to close, and controls the electronically controlled piston valve assembly to stop working, connecting the first air outlet passage and the second air outlet passage, and the first air inlet passage and the second air inlet passage, controlling the gas detection sensor to enter the detection mode, and continuing the gas parameter detection.

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